Main pipe of sub-catchment device and processing method of main pipe

Abstract

A metal seamless pipe is obtained through a cold drawing or hot rolling method, the middle section of the metal seamless pipe protrudes outwards in the radial direction through an inner high-pressure hydraulic machine and a die to be deformed into a branch pipe connector, a plurality of branch connector planes are formed in the branch pipe connector, and a plurality of round holes are formed in the branch connector planes. And necking the two ends of the metal seamless tube by using a hydraulic necking machine, and finally carrying out surface treatment. The method is reasonable and ingenious in design, an internal high-pressure integral forming method is adopted, the manifold of the water dividing and collecting device is uniform in thickness and good in pressure resistance, compared with casting and forging, used raw materials are few, the precision is higher, and the manufactured manifold of the water dividing and collecting device can serve as a manifold of water dividing and a manifold of water collecting at the same time; due to the design of the branch water outlets in the four directions, the pipe distribution is flexible, and the device can normally work in a high-temperature-difference, high-humidity and strong-corrosion complex environment.

Description

Technical Field

[0001] The invention relates to a manifold main pipe and a processing method thereof. Background Art

[0002] The manifold mains include plastic manifold mains, modular manifold mains and integrated manifold mains.

[0003] At present, with the improvement of domestic living standards, people pay more and more attention to living comfort, and many people install floor heating facilities indoors. Because floor heating can evenly heat or dissipate heat through the ground, it can solve the problem of local overheating or overcooling caused by traditional radiators, and it can reduce air convection to maintain suitable indoor humidity. With the development of floor heating technology, the life of the floor heating system has also been significantly extended, which has also played a huge role in promoting the appreciation of the house. At present, the main manifold, an important component in the floor heating system, has problems such as low pressure resistance, easy corrosion, easy cracking due to large temperature differences, inconvenient installation and easy leakage, and there is a certain room for improvement.

[0004] The Chinese utility model patent with announcement number CN218408984U and announcement date February 22, 2022, discloses an integrated plastic manifold and a floor containing the same. The manifold main pipe adopts a new type of plastic material and a design with four branches directly out in the same direction. The design is simple to form and low in cost, but the overall plastic has poor temperature resistance and poor thermal expansion. It is easy to deform greatly when the temperature changes, resulting in damage and leakage at the interface, and the mechanical strength is low and easy to be damaged.

[0005] The Chinese invention patent with the announcement number CN118031275A and the announcement date of May 14, 2024, discloses a new modular plastic manifold. The design divides the traditional manifold main pipe into multiple interconnected manifold main pipe modules. A single main pipe module is equipped with left and right connection modules, and the number and direction of branch pipes can be selected by the user. The design adopts modular installation, with small size, strong functionality and easy installation, but the main body is still made of plastic, with poor corrosion resistance and many interfaces, and the possibility of water leakage is high.

[0006] The Chinese invention patent with announcement number CN115013850A and announcement date September 6, 2022 discloses a modular manifold with integrated inlet and return water and air insulation. The design connects the inlet and return water exhaust tanks and the inlet and return water manifold main pipes together, and the main pipe adopts a modular design, and the number of branch pipes can be determined by itself. The design uses PPR material with good pressure resistance. The branch and main road are welded, and the sealing is good. However, the integrated design occupies a large space and is not convenient for installation.

[0007] Currently, most of the manifolds on the market are made of plastic or metal castings. Therefore, a method for making a new type of manifold is needed to solve the problems of material waste and low precision caused by metal casting. The manifolds made by this method can solve the above problems caused by the use of plastic materials. Summary of the invention

[0008] In order to overcome the above-mentioned shortcomings, the present invention provides a manifold main pipe of a manifold and a processing method thereof, which is resistant to temperature difference, pressure and corrosion, and has flush branch interfaces and good airtightness of connection.

[0009] To achieve this purpose, the method adopted by the present invention is: the manifold of the manifold includes a seamless pipe structure composed of an upper joint, a manifold body and a lower joint arranged in sequence, at least one branch pipe joint is arranged on the manifold body, and four branch interface planes are evenly arranged on the surface of each branch pipe joint, and a circular hole is opened on each branch interface plane, which is a branch interface, and the branch interface is connected with the main pipe body.

[0010] The ratio of the branch pipe joint diameter to the main pipe body diameter is less than or equal to 1.25.

[0011] A rounded transition is arranged between adjacent branch interface planes on each branch pipe joint, and the ratio of the diameter of the branch interface to the outer diameter of the main pipe body is less than or equal to 0.5.

[0012] An arc transition is arranged between the upper joint and the main pipe body, and the outer diameter ratio of the upper joint and the main pipe body is 0.7-0.8.

[0013] An arc transition is arranged between the lower joint and the main pipe body, and the outer diameter ratio of the lower joint and the main pipe body is 0.7-0.8.

[0014] The processing method of the manifold main pipe is as follows:

[0015] S1: Seamless tube made of metal obtained by cold drawing or hot rolling;

[0016] S2: Using an internal high-pressure hydraulic press and a specific die to deform the middle part of the seamless metal pipe radially outward, a plurality of branch pipe joints are formed in the middle part of the seamless metal pipe, each branch pipe joint having a plurality of branch interface planes;

[0017] S3: using laser cutting to form a circular hole on each branch interface plane;

[0018] S4: Use a hydraulic necking machine to neck the two ends of the seamless metal tube;

[0019] S5: Surface treatment is performed on the entire manifold after plastic treatment;

[0020] The end surface flatness of the seamless pipe is processed after cold drawing or hot rolling.

[0021] The S2 step is to place the seamless metal tube obtained after cold drawing or hot rolling into the lower mold and complete the closing with the upper mold, and inject high-pressure liquid into the interior while applying pressure at both ends of the seamless tube. As the pressure of the high-pressure liquid increases, the pressure at both ends also increases continuously, and the material is supplemented for the convex forming of the middle part. The middle part of the seamless metal tube convexly deforms radially outward, wherein the pressure of the injected high-pressure liquid is between 200MPa and 400MPa; the axial thrust applied to both ends of the seamless tube is between 50 tons and 100 tons; and the nominal clamping force is between 500 tons and 100 tons.

[0022] The surface treatment is to plate one or more of nickel, chromium and molybdenum on the surface of the manifold main pipe.

[0023] The beneficial effects are as follows: the design of the present invention is reasonable and ingenious, and the internal high-pressure integral forming method is adopted to make the manifold main pipe have uniform thickness and good pressure resistance. Compared with casting and forging, less raw materials are used and the precision is higher. The manifold main pipe obtained can serve as a water distribution main pipe and a water collection main pipe at the same time. The design of the branch water outlets in four directions makes the pipe layout flexible, and it can work normally in a complex environment with high temperature difference, high humidity and strong corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0025] Figure 1 It is a front view of the present invention;

[0026] Figure 2 is a stereogram of the present invention;

[0027] Figure 3 is a cross-sectional view of the present invention;

[0028] Figure 4 It is a plan cross-sectional view of the branch interface. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0030] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components; the fixed connection can be welding or gluing. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1-Figure 4 As shown, the manifold A of the manifold includes an annular upper joint 1 and an annular lower joint 6, and a manifold body 5 connected to the upper joint 1 and the lower joint 6. The upper joint 1 and the lower joint 6 are aligned in the longitudinal direction and spaced apart from each other. They can be installed on the manifold, with one end connected to the water outlet or inlet and the other end connected to the ventilation device. It also includes one or more branch pipe joints 2 formed on the manifold body 5. When multiple branch pipe joints 2 are provided, the multiple branch pipe joints 2 are evenly arranged on the manifold body 5. Preferably, two branch pipe joints 2 are provided on the manifold body 5.

[0033] The branch pipe joint 2 has multiple groups of branch interface planes 4 and branch interfaces 3, preferably four groups, and adjacent branch interface planes 4 are perpendicular to each other. The distance between corresponding parallel branch interface planes 4 is the outer diameter of the main pipe body 5, and the formed plane can provide a more stable connection mode for the branch. The branch interfaces 3 are circular holes of the same size and are all located at the center of the corresponding branch interface plane 4. The outer edges of the branch interfaces 3 are all at a distance from the outer edge of the branch interface plane 4. There are rounded transitions between adjacent branch interface planes 4, so that the internal water pressure will not be concentrated at a certain point and it is easy to form with internal high pressure.

[0034] There is a smooth transition between the branch joint 2 and the main pipe body 5 of the manifold A, and the thickness is uniform after forming. In the use of the manifold A, this design can improve the water flow collision in the pipe and improve the formability of the internal high pressure forming method.

[0035] The ratio of the maximum outer diameter of the branch connector 2 to the outer diameter of the main pipe body 5 shall not be higher than 1.25, and is preferably between 1.18-1.22. For example, for a manifold with a size of 32 mm, the above ratio may be approximately between 1.2-1.22, and is preferably 1.2. For example, for a manifold with a size of 52 mm, the above ratio may be approximately between 1.18-1.2, and is preferably 1.18. This makes the shape of the branch main pipe more expanded, which can increase the water flow cross-section near the branch main pipe, slow down the water flow speed and collision pressure, and improve stability. Moreover, this design reduces the forming problems caused by excessive feeding during the internal high-pressure forming process.

[0036] The ratio of the outer diameter of the branch interface 3 to the outer diameter of the main pipe body 5 shall not be higher than 0.5, and is preferably between 0.35-0.4. For example, for a manifold main pipe with a size of 32 mm, the above ratio may be approximately between 0.38-0.4, preferably 0.38. For example, for a manifold main pipe with a size of 52 mm, the above ratio may be approximately between 0.35-0.37, preferably 0.35. This allows the branch to select the corresponding size by itself, improving the flexibility and stability of the interface connection. Under this design, you can choose how large the branch interface 3 needs to be reserved according to your needs.

[0037] There is an arc transition between the upper joint 1 and the lower joint 6 and the main pipe body. The ratio of the outer diameter of the upper joint 1 and the lower joint 6 to the outer diameter of the main pipe body 5 is approximately between 0.7-0.8, preferably approximately between 0.73-0.77. For example, for a manifold with a size of 32 mm, the above ratio may be approximately between 0.75-0.77, preferably 0.75. For example, for a manifold with a size of 52 mm, the above ratio may be approximately between 0.73-0.75, preferably 0.73. This makes the water flow section of the inlet or outlet of the manifold A smaller, speeds up the flow speed, and improves the heat exchange efficiency. At the same time, this design can improve the flexibility and stability of the connection between the two ends of the manifold A.

[0038] In order to ensure the structural strength and pressure bearing strength of the manifold A of such a short length, the manifold A is preferably made entirely of stainless steel by cold drawing or hot rolling, wherein the stainless steel preferably contains chromium, nickel and molybdenum. The manifold A made of such material can have good corrosion resistance, strength and toughness.

[0039] The processing method of the above-mentioned manifold main pipe comprises the following steps:

[0040] S1: Seamless tube made of metal obtained by cold drawing or hot rolling;

[0041] S2: Using an internal high-pressure hydraulic press and a specific die to deform the middle part of the seamless metal pipe radially outward, a plurality of branch pipe joints are formed in the middle part of the seamless metal pipe, each branch pipe joint having a plurality of branch interface planes;

[0042] S3: using laser cutting to form a circular hole on each branch interface plane;

[0043] S4: Use a hydraulic necking machine to neck the two ends of the seamless metal tube;

[0044] S5: Surface treatment is performed on the entire manifold after plastic treatment;

[0045] In S1, it is preferred to use stainless steel to obtain a seamless stainless steel pipe through a cold drawing or hot rolling process.

[0046] In S2, the seamless metal tube obtained after cold drawing or hot rolling is placed in the lower mold and closed with the upper mold. While applying pressure at both ends of the seamless tube, high-pressure liquid is injected into the interior thereof. As the pressure of the high-pressure liquid increases, the pressure at both ends also increases continuously, and the middle part is supplemented for protruding forming. The middle part of the seamless metal tube is radially convex and deformed outward, wherein the pressure of the injected high-pressure liquid is 200MPa to 400MPa; the axial thrust applied to both ends of the seamless tube is 50 tons to 100 tons; the nominal clamping force is 500 tons to 100 tons. The inner surfaces of the upper and lower molds as contour limiting molds are preferably matched with the contour to be obtained by the branch joint 2. The original main pipe body 5 is formed into a specific arc shape of the branch joint 2 by the combination of the above-mentioned internal high pressure and the supplement of the pressure at both ends. This arc shape is very beneficial to the water flow inside the manifold of the manifold.

[0047] In the above-mentioned internal high pressure forming process, high pressure liquid is injected into the seamless stainless steel pipe and pressure is applied to both ends of the seamless stainless steel pipe to make the middle part of the main pipe body 5 protrude radially outward and deform to form the branch joint 2. It is not necessary to preheat the seamless stainless steel pipe and the forming can be completed at room temperature. In this case, there will be no excessive rebound and the formed branch joint has high precision.

[0048] In S3, a laser cutting machine is used to cut a branch interface circular hole 3 of the same size in the center of the branch interface plane 4. This method has high cutting accuracy and high speed, which greatly improves the accuracy and stability of branch installation and improves production efficiency.

[0049] In S4, a mold having the same diameter as that to be reduced is fixed on a workbench, the manifold main pipe A after laser cutting is fixed on the slide rail of the tool table, and the manifold main pipe A is slowly pushed into the mold to complete the shrinking process.

[0050] In S5, the surface treatment can be electroplating, which is to plate one or more of nickel, chromium, and molybdenum on the surface of the manifold main pipe. Before electroplating, the manifold main pipe needs to be shaped after the shrinkage is completed to avoid grinding and damaging the electroplating layer after the subsequent electroplating. Specifically, the manifold main pipe A after the shaping treatment is cleaned, pickled and activated, and then placed in an electroplating tank with a chromium electroplating solution through a hanger. As the power is continuously turned on, chromium ions are deposited on the stainless steel surface to form a coating. The manifold main pipe is more resistant to corrosion and wear, and the appearance effect is also better.

[0051] The manifold A can be made by the internal high pressure forming method. The manifold A will not have problems such as poor pressure resistance, easy corrosion, easy cracking due to large temperature difference, inconvenient installation and easy leakage. When installed and used, the manifold A can withstand the corresponding pressure, the deformation is small, and the leakage caused by the deformation of the pipe body can be avoided. At the same time, the cost is low and the production efficiency is high, which is very suitable for the application of manifolds.

[0052] The above is based on the present invention as an inspiration. Through the above description, relevant staff can make various changes and modifications without departing from the technical idea of ​​this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. The manifold of the manifold is characterized by: The invention comprises a seamless pipe structure composed of an upper joint (1), a main pipe body (5) and a lower joint (6) which are arranged in sequence, wherein at least one branch pipe joint (2) is arranged on the main pipe body (5), and each branch pipe joint (2) is evenly provided with one or more branch interface planes (4) on its surface, and each branch interface plane (4) is provided with a circular hole, which is a branch interface (3), and the branch interface (3) is connected to the main pipe body (5).

2. The manifold header according to claim 1, characterized in that: The ratio of the diameter of the branch pipe joint (2) to the diameter of the main pipe body (5) is less than or equal to 1.

25.

3. The manifold header according to claim 1, characterized in that: A rounded transition is provided between adjacent branch interface planes (4) on each branch pipe joint (2), and the ratio of the diameter of the branch interface (3) to the outer diameter of the main pipe body (5) is less than or equal to 0.

5.

4. The manifold header according to claim 1, characterized in that: An arc transition is arranged between the upper joint (1) and the main pipe body (5), and the outer diameter ratio of the upper joint (1) to the main pipe body (5) is 0.7 to 0.

8.

5. The manifold according to claim 1, characterized in that: An arc transition is arranged between the lower joint (6) and the main pipe body (5), and the outer diameter ratio of the lower joint (6) to the main pipe body (5) is 0.7 to 0.

8.

6. The method for processing the manifold of the manifold according to any one of claims 1 to 5, characterized in that: Here are the steps: S1: Seamless tube made of metal obtained by cold drawing or hot rolling; S2: Using an internal high-pressure hydraulic press and a specific die to deform the middle part of the seamless metal pipe radially outward, a plurality of branch pipe joints are formed in the middle part of the seamless metal pipe, each branch pipe joint having a plurality of branch interface planes; S3: using laser cutting to form a circular hole on each branch interface plane; S4: Use a hydraulic necking machine to neck the two ends of the seamless metal tube; S5: Perform surface treatment on the entire manifold main pipe after plastic treatment.

7. The method for processing the manifold of a manifold according to claim 5, characterized in that: The end surface flatness of the seamless pipe is processed after cold drawing or hot rolling.

8. The method for processing the manifold of a manifold according to claim 5, characterized in that: The S2 step is to place the seamless metal tube obtained after cold drawing or hot rolling into the lower mold and complete the closing with the upper mold, and inject high-pressure liquid into the interior while applying pressure at both ends of the seamless tube. As the pressure of the high-pressure liquid increases, the pressure at both ends also increases continuously, and the material is supplemented for the convex forming of the middle part. The middle part of the seamless metal tube convexly deforms radially outward, wherein the pressure of the injected high-pressure liquid is between 200MPa and 400MPa; the axial thrust applied to both ends of the seamless tube is between 50 tons and 100 tons; and the nominal clamping force is between 500 tons and 100 tons.

9. The method for processing the manifold of a manifold according to claim 5, characterized in that: The electroplating treatment is to plate one or more of nickel, chromium and molybdenum on the surface of the manifold main pipe.

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