A temperature distortion tester tee pipe fitting and a design method thereof

Abstract

The application belongs to the field of aviation pipeline design, and particularly relates to a temperature distortion tester tee pipe fitting and a design method thereof. The temperature distortion tester tee pipe fitting is in Y shape, comprising a main pipeline and completely symmetrical left and right branch pipelines. The left branch pipeline comprises a left branch pipeline first pipe section, a left branch pipeline second pipe section and a left branch pipeline third pipe section connected in sequence, the left branch pipeline first pipe section is connected with the main pipeline, and the left branch pipeline third pipe section is connected with an external pipeline. The right branch pipeline comprises a right branch pipeline first pipe section, a right branch pipeline second pipe section and a right branch pipeline third pipe section connected in sequence, the right branch pipeline first pipe section is connected with the main pipeline and the left branch pipeline first pipe section respectively, and the right branch pipeline third pipe section is connected with the external pipeline. The longitudinal section of the left branch pipeline first pipe section and the right branch pipeline first pipe section is pentagonal. The longitudinal section of the left branch pipeline second pipe section and the right branch pipeline second pipe section is isosceles trapezoidal. The longitudinal section of the left branch pipeline third pipe section and the right branch pipeline third pipe section is right trapezoidal.

Description

Technical Field

[0001] This application belongs to the field of aviation pipeline design, and specifically relates to a tee fitting for a temperature distortion tester and its design method. Background Technology

[0002] A tee fitting is a pipe fitting with three openings. In some experimental equipment and fluid piping networks, using tees to achieve fluid diversion is very common and necessary. In a certain type of engine temperature distortion tester, a tee fitting is required that can ensure consistent airflow direction while reducing pipe space layout and minimizing airflow pressure loss.

[0003] Currently, design methods for tee fittings are almost nonexistent. Non-standard tee fittings are typically designed based on the designer's engineering experience or the reserved assembly space, lacking a clear design process. Furthermore, common tee fittings have relatively simple structures. Most tee fittings have a "T"-shaped opening, with fluid entering through one pipe and exiting through the other two. To ensure consistent airflow directions at the inlet and outlet, such tee fittings require a large space for pipe network arrangement; insufficient space prevents the implementation of their structural design. The few "Y"-shaped tee fittings, besides lacking a systematic design methodology, require additional small pipe sections for a smooth transition, increasing structural complexity. This makes it difficult to guarantee repeatability in mass production, thus increasing manufacturing costs and processing efficiency.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a temperature distortion tester tee fitting and its design method to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] The first aspect of this application provides a Y-shaped tee fitting for a temperature distortion tester, comprising a main pipe and a left branch and a right branch respectively connected to the main pipe, wherein the left branch and the right branch are completely symmetrical.

[0008] The left branch includes a first left branch pipe segment, a second left branch pipe segment, and a third left branch pipe segment connected in sequence. The first left branch pipe segment is connected to the main pipe, and the third left branch pipe segment is connected to an external pipe.

[0009] The right branch includes a first right branch pipe segment, a second right branch pipe segment, and a third right branch pipe segment connected in sequence. The first right branch pipe segment is connected to the main pipe and the first left branch pipe segment, respectively, and the third right branch pipe segment is connected to an external pipe.

[0010] The interface section connecting the first pipe section of the left branch to the main pipe has a predetermined angle with the axis, and the interface section connecting the first pipe section of the right branch to the main pipe has a predetermined angle with the axis;

[0011] The longitudinal sections of the first pipe segment of the left branch and the first pipe segment of the right branch are both pentagonal;

[0012] The longitudinal sections of both the second pipe segment of the left branch and the second pipe segment of the right branch are isosceles trapezoids.

[0013] The longitudinal sections of both the third pipe segment of the left branch and the third pipe segment of the right branch are right-angled trapezoids.

[0014] In at least one embodiment of this application,

[0015] The interface section connecting the second pipe section of the left branch to the first pipe section of the left branch is elliptical, and the interface section connecting the second pipe section of the left branch to the third pipe section of the left branch is elliptical.

[0016] The interface section connecting the second pipe section of the right branch to the first pipe section of the right branch is elliptical, and the interface section connecting the second pipe section of the right branch to the third pipe section of the right branch is elliptical.

[0017] In at least one embodiment of this application, the third pipe segment of the left branch is connected to the external pipeline via a flange, and the third pipe segment of the right branch is connected to the external pipeline via a flange.

[0018] In at least one embodiment of this application, both the first pipe segment of the left branch and the first pipe segment of the right branch are formed by welding plates according to the layout method.

[0019] The second aspect of this application provides a design method for a tee fitting for a temperature distortion tester, based on the temperature distortion tester tee fitting described above, comprising:

[0020] Step 1: Obtain input conditions, including the outer diameter of the main pipeline. The diameter of the first pipe section (circular cross-section) Second section pipe diameter Third pipe section diameter Temperature distortion tester tee fitting outlet center distance L 中心距 The total length L of the tee fitting for the temperature distortion tester;

[0021] Step 2: Obtain the longitudinal section of the tee fitting for the temperature distortion tester, establish a rectangular coordinate system, take the vertex O of the main pipeline as the origin of the coordinate system, take the axis as the Y-axis, determine the X-axis based on the Y-axis, and determine the coordinates of the key points;

[0022] Step 3: Establish a calculation model for the tee fitting of the temperature distortion tester and solve for the geometric parameters of the tee fitting of the temperature distortion tester.

[0023] In at least one embodiment of this application, step two, determining the coordinates of the key points, includes:

[0024] The intersection line of the first interface section and the longitudinal section of the temperature distortion tester tee fitting is OD; the intersection line of the second interface section and the longitudinal section of the temperature distortion tester tee fitting is OF; the intersection line of the third interface section and the longitudinal section of the temperature distortion tester tee fitting is OA; and the endpoints of the longitudinal section of the first pipe segment of the left branch are OABCD. Among them, the first interface section is the interface section connecting the first pipe segment of the left branch to the main pipe; the second interface section is the interface section connecting the first pipe segment of the right branch to the main pipe; and the third interface section is the interface section connecting the first pipe segment of the left branch to the first pipe segment of the right branch.

[0025] Determine the coordinates of the following key points:

[0026]

[0027] The coordinates of point S, which is symmetrical to point F with respect to the X-axis, are:

[0028]

[0029] The coordinates of the midpoint E of line segment BC are:

[0030] E(-L H L H )

[0031] The line l containing line segment AS AS Represented as:

[0032]

[0033] Point B lies on line l AS If the coordinates of point B are:

[0034]

[0035] Wherein, α is the angle between the first interface section or the second interface section and the axis.

[0036] In at least one embodiment of this application, step three, which involves establishing a calculation model for the temperature distortion tester tee fitting and solving for its geometric parameters, includes:

[0037] The intersection line of the fourth interface section and the longitudinal section of the temperature distortion tester tee fitting is BC, and the intersection line of the fifth interface section and the longitudinal section of the temperature distortion tester tee fitting is GH. Among them, the fourth interface section is the interface section connecting the first pipe section of the left branch and the second pipe section of the left branch, and the fifth interface section is the interface section connecting the second pipe section of the left branch and the third pipe section of the left branch.

[0038] The length of line segment BE is calculated as follows:

[0039]

[0040] The length of line segment BC is:

[0041] |BC|=2|BE| (2)

[0042] Define the cutting angle of the third pipe segment of the left branch as β, then the angle between the line containing line segment GH and the X-axis is β;

[0043] According to geometric relationships, the angle between the line containing line segment BE and the X-axis is 3β. Therefore, the slope of line segment BE is:

[0044]

[0045] According to the triangular relationship:

[0046]

[0047] Determine L based on input conditions H ,in:

[0048]

[0049] Based on the input conditions, α is determined as follows:

[0050]

[0051] Calculate the parameters x and β according to formulas (1), (2), (3), and (4);

[0052] Constraint verification is performed on parameters x and β. When both parameters x and β meet the requirements, the lengths of the second pipe segment L2, the third pipe segment L3, and the main pipeline L are determined. 主 .

[0053] In at least one embodiment of this application

[0054] Constraint verification of parameter x includes:

[0055] Obtain the first constraint:

[0056]

[0057] When parameter x satisfies the first constraint condition, the parameter x is defined to meet the requirements.

[0058] Constraint verification of parameter β includes:

[0059] Establish the equation:

[0060]

[0061] β, L H , L 中心距 Substitute into formula (8) to calculate L2;

[0062] Obtain the second constraint:

[0063]

[0064] When parameter L2 satisfies the second constraint condition, the parameter β is defined to meet the requirements.

[0065] In at least one embodiment of this application, when parameters x and β cannot simultaneously meet the requirements, the process returns to step one to adjust the input conditions.

[0066] In at least one embodiment of this application, the determination of the second pipe segment length L2, the third pipe segment length L3, and the main pipeline length L... 主 include:

[0067] The length L2 of the second pipe section is obtained according to formula (8);

[0068] The length of the third pipe section L3 and the length of the main pipeline L are determined based on the total length L of the tee fitting for the temperature distortion tester. 主 The sum of:

[0069]

[0070] Based on the length of the third pipe section L3 and the length of the main pipeline L 主 The sum of these factors determines the length of the third pipe segment L3 and the length of the main pipeline L. 主 .

[0071] The invention has at least the following beneficial technical effects:

[0072] The temperature distortion tester tee fitting of this application has the same flow direction for the inlet and outlet fluids, which minimizes the energy loss of the fluid. In addition, the Y-shaped arrangement has a smaller outer dimension in the direction perpendicular to the flow direction, which can maximize the utilization of the space of the reducing tee. Attached Figure Description

[0073] Figure 1This is a front view of a temperature distortion tester tee fitting according to one embodiment of this application;

[0074] Figure 2 This is a perspective view of a temperature distortion tester tee fitting according to one embodiment of this application;

[0075] Figure 3 This is a flowchart of a design method for a tee fitting for a temperature distortion tester according to one embodiment of this application;

[0076] Figure 4 This is a coordinate system diagram of one embodiment of this application;

[0077] Figure 5 This is a front view of the first pipe segment of the left branch according to one embodiment of this application;

[0078] Figure 6 This is a perspective view of the first pipe segment of the left branch in one embodiment of this application;

[0079] Figure 7 This is an unfolded diagram of the first pipe segment of the left branch in one embodiment of this application.

[0080] in:

[0081] 1-Main road; 2-Left branch road first section; 3-Right branch road first section; 4-Left branch road second section; 5-Right branch road second section; 6-Left branch road third section; 7-Right branch road third section. Detailed Implementation

[0082] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0083] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0084] The following is in conjunction with the appendix Figures 1 to 7 This application will be described in further detail.

[0085] This application provides a temperature distortion tester tee fitting, the tee fitting being Y-shaped, including a main pipe 1 and a left branch and a right branch respectively connected to the main pipe 1, the left branch and the right branch being completely symmetrical.

[0086] Specifically, such as Figure 1-2 As shown, the temperature distortion tester's tee fitting branches off from the main pipe 1 (with a larger diameter) into two completely symmetrical branches with smaller diameters: a left branch and a right branch. The left branch includes three sequentially connected pipe segments: a first left branch segment 2, a second left branch segment 4, and a third left branch segment 6. The first left branch segment 2 connects to the main pipe 1, and the third left branch segment 6 connects to an external pipeline via a flange. The right branch includes three sequentially connected pipe segments: a first right branch segment 3, a second right branch segment 5, and a third right branch segment 7. The first right branch segment 3 connects to both the main pipe 1 and the first left branch segment 2, and the third right branch segment 7 connects to an external pipeline via a flange.

[0087] Main pipe 1 is a single pipe segment, formed by two symmetrical cuts made from one end face of a single, continuous pipe. The interface between the first segment 2 of the left branch and the main pipe 1 has a predetermined angle α with the axis, as does the interface between the first segment 3 of the right branch and the main pipe 1. The first segments of both the left and right branches have three interfaces, connecting to main pipe 1, the first segment of another branch, and the second segment of the corresponding branch, respectively. The longitudinal sections of both the first segments 2 of the left branch and 3 of the right branch are pentagonal. The second segments of both the left and right branches have two interfaces, connecting to the first and third segments of the corresponding branches, respectively. The longitudinal sections of both the second segments 4 of the left branch and 5 of the right branch are isosceles trapezoids, with the planes containing the two sides representing their interfaces with the first and third segments of the corresponding branches. The third pipe segment of both the left and right branches has two interfaces, connecting to the second pipe segment of the corresponding branch and the external piping system, respectively. The longitudinal section of the third pipe segment 6 of the left branch and the third pipe segment 7 of the right branch are both right-angled trapezoids. The plane containing the hypotenuse is the interface with the second pipe segment of the corresponding branch, and the plane containing the right-angled side is the interface between the two branches and the external piping system. The connection method is flange connection. The pipe diameter of the second and third pipe segments of each branch is equal.

[0088] In a preferred embodiment of this application, the inlet cross-section of the main pipeline 1 is circular, the outlet cross-sections of the third pipe section 6 of the left branch and the third pipe section 7 of the right branch are circular, the interface cross-section connecting the second pipe section 4 of the left branch and the first pipe section 2 of the left branch is elliptical, the interface cross-section connecting the second pipe section 4 of the left branch and the third pipe section 6 of the left branch is elliptical, the interface cross-section connecting the second pipe section 5 of the right branch and the first pipe section 3 of the right branch is elliptical, and the interface cross-section connecting the second pipe section 5 of the right branch and the third pipe section 7 of the right branch is elliptical.

[0089] In a preferred embodiment of this application, both the first pipe section 2 of the left branch and the first pipe section 3 of the right branch are formed by welding plates according to the layout method.

[0090] Based on the above-mentioned temperature distortion tester tee fitting, a second aspect of this application provides a design method for a temperature distortion tester tee fitting, comprising:

[0091] Step 1: Obtain input conditions, including the main pipeline diameter. The diameter of the first pipe section (circular cross-section) Second section pipe diameter Third pipe section diameter Temperature distortion tester tee fitting outlet center distance L 中心距 The total length L of the tee fitting for the temperature distortion tester; where pipe diameter can represent the outer diameter of the pipe.

[0092] Step 2: Obtain the longitudinal section of the tee fitting for the temperature distortion tester, establish a rectangular coordinate system, take the vertex O of the main pipeline as the origin of the coordinate system, take the axis as the Y-axis, determine the X-axis based on the Y-axis, and determine the coordinates of the key points;

[0093] Step 3: Establish a calculation model for the tee fitting of the temperature distortion tester and solve for the geometric parameters of the tee fitting of the temperature distortion tester.

[0094] Establish a rectangular coordinate system, such as Figure 4-5 As shown, the intersection line of the first interface section and the longitudinal section of the temperature distortion tester tee fitting is OD, the intersection line of the second interface section and the longitudinal section of the temperature distortion tester tee fitting is OF, and the intersection line of the third interface section and the longitudinal section of the temperature distortion tester tee fitting is OA. The first interface section is the interface section connecting the first pipe section of the left branch to the main pipe, the second interface section is the interface section connecting the first pipe section of the right branch to the main pipe, and the third interface section is the interface section connecting the first pipe section of the left branch to the first pipe section of the right branch. The longitudinal section of the first pipe section 2 of the left branch is a pentagon with endpoints OABCD, and point S is the point F phase. For points symmetrical about the X-axis, line segments OA, OD, OF, and OS have equal lengths. Points A, D, F, and S lie on a circle centered at point O. Therefore, line segment AD is perpendicular to line segment AS, and point B is on the extension of line segment AS. Thus, a rectangle ADTS is obtained in the coordinate system. This rectangle is the projection of the pipe with the length of line segment AD as its diameter and the length of line segment AS as its height. This cylindrical segment is denoted as pipe segment ADTS. The shape of segment AOD in the first pipe segment is exactly the same as the remaining part after cutting along the plane containing line segments AT and DS of pipe segment ADTS, always ensuring that the cross-section containing line segment AD is a circle. The cut shape corresponding to line segment BC is elliptical. Taking the midpoint E of line segment BC, the angle between line segment OE and line segment OA is 45°.

[0095] Based on the given input conditions, a tee fitting for a temperature distortion tester can be determined. Taking the left branch as an example, step two, determining the coordinates of key points, includes:

[0096] Determine the coordinates of the following key points:

[0097]

[0098] The coordinates of point S, which is symmetrical to point F with respect to the X-axis, are:

[0099]

[0100] Define the coordinates of the midpoint E of line segment BC as:

[0101] E(-L H L H )

[0102] The line l containing line segment AS AS Represented as:

[0103]

[0104] Point B lies on line l AS If the coordinates of point B are:

[0105]

[0106] Wherein, α is the angle between the first interface section or the second interface section and the axis.

[0107] In step three, a calculation model for the tee fitting of the temperature distortion tester is established, and the geometric parameters of the tee fitting of the temperature distortion tester are solved, including:

[0108] The intersection line of the fourth interface section and the longitudinal section of the temperature distortion tester tee fitting is BC, and the intersection line of the fifth interface section and the longitudinal section of the temperature distortion tester tee fitting is GH. Among them, the fourth interface section is the interface section connecting the first pipe section of the left branch and the second pipe section of the left branch, and the fifth interface section is the interface section connecting the second pipe section of the left branch and the third pipe section of the left branch.

[0109] The length of line segment BE is calculated as follows:

[0110]

[0111] The length of line segment BC is:

[0112] |BC|=2|BE| (2)

[0113] Define the cutting angle of the third pipe segment of the left branch as β, then the angle between the line containing line segment GH and the X-axis is β;

[0114] According to geometric relationships, the angle between the line containing line segment BE and the X-axis is 3β. Therefore, the slope of line segment BE is:

[0115]

[0116] According to the triangular relationship:

[0117]

[0118] In formulas (1), (2), (3), and (4), there exist x and L. H The four unknowns, α, β, need to be determined based on the input conditions first. H α;

[0119] Determine L based on input conditions H Among them, it is guaranteed that:

[0120]

[0121] Based on the input conditions, α is determined as follows:

[0122]

[0123] Then, the parameters x and β are calculated according to formulas (1), (2), (3), and (4);

[0124] Constraint verification is performed on parameters x and β. When both parameters x and β meet the requirements, the lengths of the second pipe segment L2, the third pipe segment L3, and the main pipeline L are determined. 主 .

[0125] Specifically, based on the relative positions of points B and E in the diagram, the constraint verification of parameter x includes:

[0126] Obtain the first constraint:

[0127]

[0128] When parameter x satisfies the first constraint condition, the parameter x is defined to meet the requirements.

[0129] The constraint verification of parameter β based on the outlet center distance relationship includes:

[0130] Establish the equation:

[0131]

[0132] β, L H , L 中心距 Substitute into formula (8) to calculate L2;

[0133] Obtain the second constraint:

[0134]

[0135] When parameter L2 satisfies the second constraint condition, that is, the lengths of the second pipe segment CG and segment BH are both greater than zero, the parameter β is defined to meet the requirements.

[0136] If parameters x and β cannot simultaneously meet the requirements, return to step one to adjust the input conditions and redesign until the calculated parameters meet the constraint verification.

[0137] Determine the lengths of the second pipe segment L2, the third pipe segment L3, and the main pipeline L. 主 include:

[0138] The length L2 of the second pipe section is obtained according to formula (8);

[0139] The length of the third pipe section L3 and the length of the main pipeline L are determined based on the total length L of the tee fitting for the temperature distortion tester. 主 The sum of:

[0140]

[0141] Based on the length of the third pipe section L3 and the length of the main pipeline L 主 The sum of these factors determines the length of the third pipe segment L3 and the length of the main pipeline L. 主 .

[0142] Once the length of each pipe section is determined, a unique tee fitting for the temperature distortion tester can be identified.

[0143] The temperature distortion tester tee fitting design method of this application defines the geometric parameters constraining the structure of each pipe segment, and obtains a Y-shaped reducing tee fitting by solving the input conditions, which can adapt to different pipe diameter requirements. The tee fitting form determined by this method can ensure the consistency of fluid flow direction at the inlet and outlet ends. Compared with the prior art, the resulting pipe fitting spatial layout eliminates the problem of airflow pressure loss caused by the additional short pipe length due to the limitation of the outer dimension. The Y-shaped tee fitting designed according to this method has low flow resistance and enhanced fluid controllability.

[0144] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A Y-shaped tee fitting for a temperature distortion tester, comprising a main pipe and a left branch and a right branch respectively connected to the main pipe, wherein the left branch and the right branch are completely symmetrical, characterized in that: The left branch includes a first left branch pipe segment, a second left branch pipe segment, and a third left branch pipe segment connected in sequence. The first left branch pipe segment is connected to the main pipe, and the third left branch pipe segment is connected to an external pipe. The right branch includes a first right branch pipe segment, a second right branch pipe segment, and a third right branch pipe segment connected in sequence. The first right branch pipe segment is connected to the main pipe and the first left branch pipe segment, respectively, and the third right branch pipe segment is connected to an external pipe. The interface section connecting the first pipe section of the left branch to the main pipe has a predetermined angle with the axis, and the interface section connecting the first pipe section of the right branch to the main pipe has a predetermined angle with the axis; The longitudinal sections of the first pipe segment of the left branch and the first pipe segment of the right branch are both pentagonal; The longitudinal sections of both the second pipe segment of the left branch and the second pipe segment of the right branch are isosceles trapezoids. The longitudinal sections of the third pipe segment of the left branch and the third pipe segment of the right branch are both right-angled trapezoids. The interface section connecting the second pipe section of the left branch to the first pipe section of the left branch is elliptical, and the interface section connecting the second pipe section of the left branch to the third pipe section of the left branch is elliptical. The interface section connecting the second pipe section of the right branch to the first pipe section of the right branch is elliptical, and the interface section connecting the second pipe section of the right branch to the third pipe section of the right branch is elliptical.

2. The tee fitting for the temperature distortion tester according to claim 1, characterized in that, The third pipe section of the left branch is connected to the external pipeline via a flange, and the third pipe section of the right branch is connected to the external pipeline via a flange.

3. The tee fitting for the temperature distortion tester according to claim 2, characterized in that, Both the first pipe section of the left branch and the first pipe section of the right branch are welded from sheet metal using a layout method.

4. A design method for a tee fitting for a temperature distortion tester, based on the tee fitting for a temperature distortion tester as described in any one of claims 1 to 3, characterized in that, include: Step 1: Obtain input conditions, including the main pipeline diameter. The diameter of the first pipe section (circular cross-section) Second section pipe diameter Third pipe section diameter Temperature distortion tester tee fitting outlet center distance L 中心距 The total length L of the tee fitting for the temperature distortion tester; Step 2: Obtain the longitudinal section of the tee fitting for the temperature distortion tester, establish a rectangular coordinate system, take the vertex O of the main pipeline as the origin of the coordinate system, take the axis as the Y-axis, determine the X-axis based on the Y-axis, and determine the coordinates of the key points; Step 3: Establish a calculation model for the tee fitting of the temperature distortion tester and solve for the geometric parameters of the tee fitting of the temperature distortion tester; In step two, determining the coordinates of the key points includes: The intersection line of the first interface section and the longitudinal section of the temperature distortion tester tee fitting is OD; the intersection line of the second interface section and the longitudinal section of the temperature distortion tester tee fitting is OF; the intersection line of the third interface section and the longitudinal section of the temperature distortion tester tee fitting is OA; and the endpoints of the longitudinal section of the first pipe segment of the left branch are OABCD. Among them, the first interface section is the interface section connecting the first pipe segment of the left branch to the main pipe; the second interface section is the interface section connecting the first pipe segment of the right branch to the main pipe; and the third interface section is the interface section connecting the first pipe segment of the left branch to the first pipe segment of the right branch. Determine the coordinates of the following key points: The coordinates of point S, which is symmetrical to point F with respect to the X-axis, are: The coordinates of the midpoint E of line segment BC are: E(-L H ,THE H ) The line l containing line segment AS AS Represented as: Point B lies on line l AS If the coordinates of point B are: Wherein, α is the angle between the first interface section or the second interface section and the axis.

5. The design method for the tee fitting of the temperature distortion tester according to claim 4, characterized in that, In step three, establishing a calculation model for the temperature distortion tester tee fitting and solving for its geometric parameters includes: The intersection line of the fourth interface section and the longitudinal section of the temperature distortion tester tee fitting is BC, and the intersection line of the fifth interface section and the longitudinal section of the temperature distortion tester tee fitting is GH. Among them, the fourth interface section is the interface section connecting the first pipe section of the left branch and the second pipe section of the left branch, and the fifth interface section is the interface section connecting the second pipe section of the left branch and the third pipe section of the left branch. The length of line segment BE is calculated as follows: The length of line segment BC is: |BC|=2|BE| (2) Define the cutting angle of the third pipe segment of the left branch as β, then the angle between the line containing line segment GH and the X-axis is β; According to geometric relationships, the angle between the line containing line segment BE and the X-axis is 3β. Therefore, the slope of line segment BE is: According to the triangular relationship: Determine L based on input conditions H ,in: Based on the input conditions, α is determined as follows: Calculate the parameters x and β according to formulas (1), (2), (3), and (4); Constraint verification is performed on parameters x and β. When both parameters x and β meet the requirements, the lengths of the second pipe segment L2, the third pipe segment L3, and the main pipeline L are determined. 主 .

6. The design method for the tee fitting of the temperature distortion tester according to claim 5, characterized in that, Constraint verification of parameter x includes: Obtain the first constraint: When parameter x satisfies the first constraint condition, the parameter x is defined to meet the requirements. Constraint verification of parameter β includes: Establish the equation: β, L H , L 中心距 Substitute into formula (8) to calculate L2; Obtain the second constraint: When parameter L2 satisfies the second constraint condition, the parameter β is defined to meet the requirements.

7. The design method for the tee fitting of the temperature distortion tester according to claim 6, characterized in that, If parameters x and β cannot meet the requirements at the same time, return to step one to adjust the input conditions.

8. The design method for the tee fitting of the temperature distortion tester according to claim 7, characterized in that, The determination of the length L2 of the second pipe segment, L3 of the third pipe segment, and the length L of the main pipeline. 主 include: The length L2 of the second pipe section is obtained according to formula (8); The length of the third pipe section L3 and the length of the main pipeline L are determined based on the total length L of the tee fitting for the temperature distortion tester. 主 The sum of: Based on the length of the third pipe section L3 and the length of the main pipeline L 主 The sum of these factors determines the length of the third pipe segment L3 and the length of the main pipeline L. 主 .

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