A pipe direct head and method of manufacture

Abstract

The application provides a pipe direct head and a manufacturing method, and relates to the technical field of pipe joints. The direct head comprises a plurality of cavities arranged in the direct head and supporting a damping component arranged in the cavities. The cavities are in a vacuum state, and the cavities are in a circular ring shape coaxial with the direct head. The plurality of cavities are arranged at equal intervals in the axial direction of the direct head. The supporting damping component comprises a plurality of supports arranged at equal intervals in a circular track. The circular arrangement track of the plurality of supports is matched with the cavities. An elastic body is arranged between two adjacent supports in the arrangement track. The application reduces noise and vibration at the direct head of the pipe.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting technology, specifically to a pipe fitting and its manufacturing method. Background Technology

[0002] PVC pipes are synthetic materials made of polyvinyl chloride resin, stabilizers, lubricants, etc., through hot pressing. They are mainly divided into three types: PVC-U pipes, PVC-M pipes, and PVC-O pipes, with a melting temperature range of 185~205℃.

[0003] In the existing technology, the PVC pipe connector is located between two pipes. When the fluid in the pipe passes through the connector, it will generate vibration, resulting in greater noise and vibration at the connector. Over time, this will lead to a decrease in the sealing performance of the connector or even its detachment. Summary of the Invention

[0004] The purpose of this invention is to develop a pipe straight connector and a manufacturing method that reduces noise and vibration.

[0005] This invention is achieved through the following technical solution:

[0006] A pipe fitting, comprising:

[0007] Multiple cavities are provided within the direct head;

[0008] The vibration damping components are supported and housed within the cavity;

[0009] The cavity is a vacuum inside and is an annular shape coaxial with the direct head. Multiple cavities are arranged at equal intervals along the axial direction of the direct head. The support and vibration damping assembly includes multiple supports evenly distributed at equal intervals along a circular trajectory. The circular arrangement trajectory of the multiple supports is adapted to the cavity. An elastic body is provided between two adjacent supports on the arrangement trajectory.

[0010] Optionally, washers are fitted at both ends of the outer wall of the support, and the washers contact the inner wall of the cavity, so that the support is suspended in the cavity through the washers;

[0011] The layered structure of the gasket includes a sound-absorbing pad and an elastic pad. The sound-absorbing pad is located on the outer side and contacts the inner wall of the cavity, while the elastic pad is located on the inner side and fixed to the support.

[0012] Optionally, a damping sheet is provided on the outer wall of the support between the two washers, and the damping sheet is made of butyl rubber, polyurethane elastomer or silicone rubber.

[0013] Optionally, the support has slots at both ends for inserting an elastomer. The elastomer is in the shape of a cuboid sheet and is composed of multiple spring pieces. The multiple rectangular spring pieces are stacked radially along the direct head to form an elastomer.

[0014] Optionally, the direct connector includes a middle section and two side sections, both of which are cylindrical. The inner diameter of the side sections is adapted to the outer diameter of the pipe, and the inner diameter of the middle section is adapted to the inner diameter of the pipe. The two side sections are respectively used as insertion parts to insert into the pipe. Two sealing rings are provided on the inner wall of each of the two side sections, and multiple cavities are provided in the middle section.

[0015] A method for manufacturing a pipe fitting includes the following steps:

[0016] S1. The raw material is heated and melted in an extruder, and continuously extruded and pushed to the die by a screw. The sheet material is then extruded through the die and measured and cut online.

[0017] S2. After the board has cooled, a quality inspection is carried out to check the dimensions of the board and whether there are any cracks or abnormal thickness.

[0018] S3. Grooves are cut into the outer walls of the board at both ends of the cavity. After the board is closed, the grooves at both ends of multiple cavities are closed to form a vent. The vent is frustum-shaped with the smaller diameter end facing the cavity.

[0019] S4. Insert multiple support and vibration damping components into multiple cavities of the plate in sequence. During the process of inserting the support and vibration damping components into the cavity, first insert the support and the elastic body alternately into one end of the cavity. The elastic body is inserted into the cavity and is connected to the support inside the cavity. The support is inserted into the cavity and is connected to the elastic body inside the cavity. Repeat the above operation until the support or elastic body extends out of the other end of the cavity, so as to ensure that the two ends of the cavity are the support and the elastic body respectively.

[0020] S5. Clean and wash the welding surface of the plate to ensure that there are no impurities on the welding surface. Place the plate on the inner mold and close the plate to make it into a cylindrical shape. During this process, the elastic bodies at both ends of the cavity are inserted into the support to realize the closing of the support and vibration damping components. After applying welding flux to the welding surface, weld the two ends of the plate with a PVC welding machine. After cooling, perform quality inspection to obtain the formed direct head.

[0021] S6. Vacuum the cavity through the vent and cover it with a cap. The shape of the cap should match the vent, and the outer and inner walls of the cap should match the outer wall of the direct head and the inner wall of the cavity, respectively. First, heat and melt the welding surfaces between the vent and the cap. Then, place the cap into the vacuum equipment and vacuum the cavity. Then, press the cap into the vent until it cools and solidifies. After completion, check the quality of the direct head and the weld.

[0022] Optionally, in step S1, the shape of the extrusion cavity inside the mold is adapted to the cross-section of the direct head, the extrusion cavity inside the mold is arc-shaped in the extrusion direction and adapted to the direct head, and the extruded sheet is arc-shaped.

[0023] Optionally, in step S5, after welding the two ends of the plate, the inner mold is placed into the outer mold. The air bladder in the outer mold expands to make the air bladder into a cylindrical shape that matches the outer wall of the direct head. The air bladder squeezes the plate to press the two welded surfaces together, thus preventing the direct head from deforming.

[0024] Optionally, in step S5, the inner mold shape is adapted to the internal shape of the direct head, the outer mold is a cylindrical shape coaxial with the inner mold, the air bladder is located on the inner wall of the outer mold and is annular, the air bladder is controlled by the internal air pressure to control the pressure applied to the outside of the direct head, the inner mold is divided into two symmetrical parts in the axial direction, the two parts are bolted together, and after the direct head is cooled and formed, the two parts of the inner mold are separated to remove the direct head.

[0025] Optionally, in step S6, the evacuation device includes a cylindrical transparent evacuation cylinder with an open bottom and a shape adapted to the outer wall of the direct head. A sealing ring is provided at the bottom opening of the evacuation cylinder. An evacuation pipe connected to the evacuation system is connected to the outer wall of the top of the evacuation cylinder. The top of the evacuation cylinder is closed and a vertically lifting push rod is slidably provided. The push rod and the evacuation cylinder are slidably sealed. A pressure block with a bottom shape adapted to the cover is provided at the bottom end of the push rod.

[0026] After the pores and cap welding surfaces are heat-melted, the cap is bonded to the bottom of the pressure block. Then, the vacuum cylinder is placed on the outer wall of the direct head, and a vacuum is drawn through the vacuum tube. After vacuuming, the cap is pressed into the pore by the push rod and the pressure block. After being pressed for a period of time, the vacuum inside the vacuum cylinder is gradually broken until the air pressure inside and outside the vacuum cylinder is balanced. After the vacuum cylinder is removed, the cap and pore are cooled and formed, and the vacuuming of the cavity is completed.

[0027] The beneficial effects of this invention are:

[0028] This invention features an internal vacuum cavity, which provides the direct connector with heat insulation and soundproofing functions, reducing noise generated at the direct connector and minimizing heat exchange with the outside environment, thus improving the energy efficiency of the pipe. The support and vibration damping components installed within the cavity enhance the cavity's support and structural stability of the direct connector, while also providing vibration damping. This buffers the vibrations generated when the fluid inside the pipe passes through the direct connector. During vibration buffering, the elastic bodies of the support and vibration damping components undergo elastic deformation, converting the vibration into elastic potential energy for dissipation. Even if the direct connector is subjected to localized pressure, causing the corresponding internal support to move radially, the elastic bodies on both sides of the support will oscillate. This oscillation is then transmitted through multiple supports and multiple elastic bodies, with all elastic bodies bearing the force to jointly buffer or offset the external force, achieving the effect of vibration damping and protection for the support. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a direct head structure diagram of the present invention;

[0031] Figure 2 This is a cross-sectional structural diagram of the cavity;

[0032] Figure 3 A cross-sectional structural diagram of a sheet metal extruded from a die;

[0033] Figure 4 Here are the structural diagrams of the inner and outer molds;

[0034] Figure 5 This is a structural diagram of the evacuation equipment.

[0035] Reference numerals: 100, edge section; 101, sealing ring; 200, middle section; 201, cavity; 202, support; 203, damping plate; 204, washer; 205, elastomer; 300, outer mold; 301, airbag; 400, inner mold; 500, vacuuming device; 501, vacuuming cylinder; 502, vacuuming pipe; 503, sealing ring; 504, push rod; 505, pressure block; 506, cover. Detailed Implementation

[0036] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 this invention.

[0038] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] like Figure 1 and Figure 2 As shown, the present invention discloses a pipe fitting, including a middle section 200 and two side sections 100. The middle section 200 and the two side sections 100 are both cylindrical. The inner diameter of the side sections 100 is adapted to the outer diameter of the pipe, and the inner diameter of the middle section 200 is adapted to the inner diameter of the pipe. The two side sections 100 are respectively used as insertion parts to insert into the pipe. Two sealing rings 101 are provided on the inner wall of each side section 100.

[0040] The middle section 200 has multiple annular cavities 201 inside. The cavities 201 are coaxial with the middle section 200, and the multiple cavities 201 are arranged at equal intervals along the axial direction of the middle section 200.

[0041] The cavity 201 is in a vacuum state. The cavity 201 is equipped with a support and vibration damping component. The support and vibration damping component supports the structural stability of the cavity 201 and has a vibration damping effect, buffering the external force on the joint and the vibration generated when the flow passes through.

[0042] The vibration damping support assembly includes multiple supports 202 that are evenly distributed at equal intervals along a circular trajectory. The circular arrangement trajectory of the multiple supports 202 is adapted to the cavity 201, and an elastic body 205 is provided between two adjacent supports 202 on the arrangement trajectory.

[0043] Washers 204 are fitted at both ends of the outer wall of the support 202. The washers 204 are in contact with the inner wall of the cavity 201, and the support 202 is suspended in the cavity 201 by the washers 204. A damping plate 203 is provided on the outer wall of the support 202 between the two washers 204. The damping plate 203 is made of butyl rubber, polyurethane elastomer or silicone rubber.

[0044] The layered structure of gasket 204 includes a sound-absorbing pad and an elastic pad. The sound-absorbing pad is on the outer side and contacts the inner wall of cavity 201, while the elastic pad is on the inner side and fixed to support 202.

[0045] The support 202 has slots at both ends for inserting the elastic body 205. The elastic body 205 is rectangular and elastic. The elastic body 205 is composed of multiple elastic pieces, which are stacked radially along the middle section 200 to form the elastic body 205.

[0046] The manufacturing method of the above-mentioned pipe fitting includes the following steps:

[0047] S1.PVC-U raw material is heated and melted in an extruder, continuously extruded and pushed to a die by a screw, and extruded into sheets through the die, and then measured and cut online.

[0048] S2. After the board cools, conduct a quality inspection to check the dimensions of the board and whether there are any abnormalities such as cracks or abnormal thickness.

[0049] S3. Grooves are made on the outer wall of the plate at both ends of the plate cavity 201. After the plate is closed, the grooves at both ends of multiple cavities 201 are closed to form a vent. The vent is frustum-shaped and the small diameter end faces the cavity 201.

[0050] S4. Insert multiple support and vibration damping components into multiple cavities 201 of the plate in sequence. During the process of inserting the support and vibration damping components into the cavities 201, first insert the support 202 and the elastic body 205 alternately into one end of the cavity 201. The elastic body 205 is inserted into the cavity 201 and is inserted into the slot of the support 202 inside the cavity 201. The support 202 is inserted into the cavity 201 and its slot is inserted into the elastic body 205 inside the cavity 201. Repeat the above operation until the other end of the cavity 201 extends out of the support 202 or the elastic body 205, so as to ensure that the two ends of the cavity 201 are the support 202 and the elastic body 205 respectively.

[0051] S5. Clean and wash the welding surface of the plate to ensure that there are no impurities. Place the plate on the inner mold 400 and close the plate to make it into a cylindrical shape. During this process, the elastic bodies 205 at both ends of the cavity 201 are inserted into the slots of the support 202 to realize the closing of the support and vibration damping components. After applying welding flux to the welding surface, weld the two ends of the plate with a PVC welding machine and put the inner mold 400 into the outer mold 300. The air bladder 301 in the outer mold 300 expands to make the air bladder 301 into a cylindrical shape that matches the outer wall of the direct head. The air bladder 301 squeezes the plate to press the two welding surfaces tightly to prevent the direct head from deforming. After cooling, perform quality inspection to obtain the formed direct head.

[0052] S6. Vacuum the cavity 201 through the air hole and cover it with the cap 506. The shape of the cap 506 is adapted to the air hole. The outer and inner wall shapes of the cap 506 are adapted to the outer wall of the direct head and the inner wall of the cavity 201, respectively. Specifically, first heat and melt the welding surface between the air hole and the cap 506, put the cap 506 into the vacuum equipment 500 and vacuum the cavity 201 through the vacuum equipment 500, then press the cap 506 into the air hole until it cools and solidifies. After completion, check the quality of the direct head and the quality of the weld.

[0053] In step S1, the shape of the extrusion cavity inside the mold is adapted to the cross-section of the direct head, and the cross-section of the extruded sheet is as follows: Figure 3 As shown, the extrusion cavity inside the mold is arc-shaped in the extrusion direction to match the direct head, and the extruded sheet is arc-shaped;

[0054] like Figure 4As shown, in step S5, the inner mold 400 is adapted to the internal shape of the direct head, and the outer mold 300 is a cylindrical shape coaxial with the inner mold 400. The inner wall of the outer mold 300 is provided with a ring-shaped air bladder 301. The air bladder 301 is controlled by the internal air pressure to control the pressure applied to the outside of the direct head. The inner mold 400 is divided into two symmetrical parts in the axial direction. The two parts are bolted together. After the direct head is cooled and formed, the two parts of the inner mold 400 are separated to remove the direct head.

[0055] like Figure 5 As shown, in step S6, the evacuation device 500 includes a cylindrical transparent evacuation cylinder 501. The bottom of the evacuation cylinder 501 is open and its shape is adapted to the outer wall of the direct head. A sealing ring 503 is provided at the bottom opening of the evacuation cylinder 501. An evacuation pipe 502 connected to the evacuation system is connected to the top outer wall of the evacuation cylinder 501. The top of the evacuation cylinder 501 is closed and a vertically lifting push rod 504 is slidably provided. The push rod 504 slides and seals with the evacuation cylinder 501. A pressure block 505 is provided at the bottom end of the push rod 504. The bottom shape of the pressure block 505 is adapted to the cover 506. (The text also mentions air holes and the cover 506, but these are not directly related to the evacuation process.) After the welding surface is hot-melted, the cap 506 is bonded to the bottom of the pressure block 505. Then, the vacuum cylinder 501 is placed on the outer wall of the direct head, and a vacuum is drawn through the vacuum tube 502. After the vacuum is drawn, the cap 506 is pressed into the air hole by the push rod 504 and the pressure block 505. After being pressed for a period of time, the vacuum inside the vacuum cylinder 501 is gradually broken until the air pressure inside and outside the vacuum cylinder 501 is balanced. After the vacuum cylinder 501 is removed, due to the negative pressure inside the cavity 201, the external pressure keeps the cap 506 pressed tightly against the air hole. After the cap 506 and the air hole cool and solidify, the vacuuming of the cavity 201 is completed.

[0056] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A pipe fitting, characterized in that, include: Multiple cavities are provided within the direct head; The vibration damping components are supported and housed within the cavity; The cavity is a vacuum inside and is an annular shape coaxial with the direct head. Multiple cavities are arranged at equal intervals along the axial direction of the direct head. The support and vibration damping assembly includes multiple supports evenly distributed at equal intervals along a circular trajectory. The circular arrangement trajectory of the multiple supports is adapted to the cavity. An elastic body is provided between two adjacent supports on the arrangement trajectory. The support is fitted with washers at both ends of the outer wall of the support. The washers are in contact with the inner wall of the cavity, and the support is suspended in the cavity by the washers. The layered structure of the gasket includes a sound-absorbing pad and an elastic pad. The sound-absorbing pad is located on the outer side and contacts the inner wall of the cavity, while the elastic pad is located on the inner side and fixed to the support. The support has slots at both ends for inserting the elastic body. The elastic body is in the shape of a cuboid sheet and is composed of multiple elastic pieces. The multiple rectangular elastic pieces are stacked radially along the direct head to form the elastic body. The direct connector includes a middle section and two side sections. The middle section and the two side sections are coaxial cylindrical. The inner diameter of the side sections is adapted to the outer diameter of the pipe, and the inner diameter of the middle section is adapted to the inner diameter of the pipe. The two side sections are respectively used as insertion parts to insert into the pipe. Two sealing rings are provided on the inner wall of each of the two side sections. Multiple cavities are provided in the middle section.

2. The pipe fitting according to claim 1, characterized in that, A damping sheet is provided on the outer wall of the support between the two washers. The damping sheet is made of butyl rubber, polyurethane elastomer or silicone rubber.

3. A method for manufacturing a pipe straight connector as described in claim 1 or 2, characterized in that, Includes the following steps: S1. The raw material is heated and melted in an extruder, and continuously extruded and pushed to the die by a screw. The sheet material is then extruded through the die and measured and cut online. S2. After the board has cooled, a quality inspection is carried out to check the dimensions of the board and whether there are any cracks or abnormal thickness. S3. Grooves are cut into the outer walls of the board at both ends of the cavity. After the board is closed, the grooves at both ends of multiple cavities are closed to form a vent. The vent is frustum-shaped with the smaller diameter end facing the cavity. S4. Insert multiple support and vibration damping components into multiple cavities of the plate in sequence. During the process of inserting the support and vibration damping components into the cavity, first insert the support and the elastic body alternately into one end of the cavity. The elastic body is inserted into the cavity and is connected to the support inside the cavity. The support is inserted into the cavity and is connected to the elastic body inside the cavity. Repeat the above operation until the support or elastic body extends out of the other end of the cavity, so as to ensure that the two ends of the cavity are the support and the elastic body respectively. S5. Clean and wash the welding surface of the plate to ensure that there are no impurities on the welding surface. Place the plate on the inner mold and close the plate to make it into a cylindrical shape. During this process, the elastic body at both ends of the cavity is inserted into the support to realize the closing of the support and vibration damping component. After applying welding flux to the welding surface, weld the two ends of the plate with a PVC welding machine. After cooling, perform quality inspection to obtain the formed direct head. S6. Vacuum the cavity through the vent and cover it with a cap. The shape of the cap should match the vent, and the outer and inner walls of the cap should match the outer wall of the direct head and the inner wall of the cavity, respectively. First, heat and melt the welding surfaces between the vent and the cap. Then, place the cap into the vacuum equipment and vacuum the cavity. Then, press the cap into the vent until it cools and solidifies. After completion, check the quality of the direct head and the weld.

4. The method for manufacturing a pipe fitting according to claim 3, characterized in that, In step S1, the shape of the extrusion cavity inside the mold is adapted to the cross-section of the direct head, and the extrusion cavity inside the mold is arc-shaped in the extrusion direction, which is adapted to the direct head, and the extruded sheet is arc-shaped.

5. The method for manufacturing a pipe fitting according to claim 3, characterized in that, In step S5, after the two ends of the plate are welded, the inner mold is placed into the outer mold. The air bladder in the outer mold expands, making the air bladder into a cylindrical shape that matches the outer wall of the direct head. The air bladder squeezes the plate to press the two welded surfaces together, preventing the direct head from deforming.

6. The method for manufacturing a pipe fitting according to claim 5, characterized in that, In step S5, the inner mold shape is adapted to the internal shape of the direct head, the outer mold is a cylindrical shape coaxial with the inner mold, the air bladder is located on the inner wall of the outer mold and is annular, the air bladder is controlled by the internal air pressure to control the pressure applied to the outside of the direct head, the inner mold is divided into two symmetrical parts in the axial direction, the two parts are bolted together, and after the direct head is cooled and formed, the two parts of the inner mold are separated to remove the direct head.

7. The method for manufacturing a pipe straight connector according to claim 3, characterized in that, In step S6, the evacuation device includes a cylindrical transparent evacuation cylinder with an open bottom and a shape that matches the outer wall of the direct head. A sealing ring is provided at the bottom opening of the evacuation cylinder. An evacuation pipe that connects to the evacuation system is connected to the outer wall of the top of the evacuation cylinder. The top of the evacuation cylinder is closed and a vertically lifting push rod is slidably provided. The push rod and the evacuation cylinder are slidably sealed. A pressure block with a bottom shape that matches the cover is provided at the bottom of the push rod. After the pores and cap welding surfaces are heat-melted, the cap is bonded to the bottom of the pressure block. Then, the vacuum cylinder is placed on the outer wall of the direct head, and a vacuum is drawn through the vacuum tube. After vacuuming, the cap is pressed into the pore by the push rod and the pressure block. After being pressed for a period of time, the vacuum inside the vacuum cylinder is gradually broken until the air pressure inside and outside the vacuum cylinder is balanced. After the vacuum cylinder is removed, the cap and pore are cooled and formed, and the vacuuming of the cavity is completed.

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