One-way current limiting pipe joint and its production process

Abstract

This invention discloses a one-way flow-limiting pipe joint and its manufacturing process, relating to hydraulic components. It aims to solve the problem of dangerous situations caused by excessively rapid depressurization in hydraulic systems. The key technical points are: it includes a joint body, a flow-limiting element, and scrap steel balls. The flow-limiting element is snapped onto the inner wall of the joint body and is shaped like a frustum with both ends connected. All parts of the flow-limiting element have a uniform wall thickness and are coaxially arranged with the joint body. The outer wall of the flow-limiting element has a main oil passage groove communicating with its interior. The small end of the flow-limiting element forms an oil passage opening, and several limiting plates are fixedly connected inside the flow-limiting element. During the depressurization process of the hydraulic system, the flow of hydraulic oil moves the scrap steel balls towards the oil passage opening until the scrap steel balls abut against the inner wall of the flow-limiting element. This causes the scrap steel balls to block the oil passage opening, allowing hydraulic oil to flow only through the main oil passage groove, reducing the flow rate of hydraulic oil during depressurization and improving safety.

Description

Technical Field

[0001] This invention relates to hydraulic components, and more specifically, to a one-way flow-limiting pipe joint and its manufacturing process. Background Technology

[0002] Pipe fittings are parts in hydraulic systems that connect pipelines or mount pipelines to hydraulic components. They are a general term for detachable connectors in fluid passages, mainly including: welded, compression, crimped, and flared types. Pipe fittings are connection tools between pipes, serving as detachable connection points between components and pipes. They play an indispensable and important role in pipe fittings, being one of the two main components of hydraulic pipelines.

[0003] Existing pipe fittings include a fitting body, and depending on the type, some also include nuts, ferrules, flared cores, flared sleeves, or flared nuts. Their manufacturing process often involves cutting the raw material bar into sections, drilling, milling, and tapping them on a CNC milling machine, and finally electroplating them to prevent rust.

[0004] The connector body has a flow channel to accommodate hydraulic oil. When hydraulic systems such as lifts are in use, the hydraulic oil will flow through the flow channel in the opposite direction during the pressurization and depressurization processes. Therefore, the hydraulic oil flow rate is the same during the pressurization and depressurization processes. However, if the hydraulic system depressurizes too quickly, it can easily cause danger.

[0005] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a one-way flow-limiting pipe joint and its manufacturing process.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a one-way flow-limiting pipe connector, comprising a connector body, a flow-limiting element, and a waste steel ball, wherein the flow-limiting element is snapped onto the inner wall of the connector body, the flow-limiting element is arranged in a frustum shape with both ends connected, and the wall thickness of each part of the flow-limiting element is consistent, the flow-limiting element is coaxially arranged with the connector body, the outer wall of the flow-limiting element is provided with a main oil passage groove communicating with its interior, the small end of the flow-limiting element forms an oil passage opening, a plurality of limiting plates are fixedly connected inside the flow-limiting element, and the waste steel ball is located between the plurality of limiting plates and the oil passage opening, and the diameter of the waste steel ball is smaller than the aperture of the oil passage opening.

[0008] By adopting the above technical solution, during the depressurization process of the hydraulic system, the hydraulic oil flow carries the scrap steel balls towards the oil passage until the scrap steel balls contact the inner wall of the flow restrictor, thereby blocking the oil passage and allowing the hydraulic oil to flow only through the main oil passage groove. This reduces the hydraulic oil flow during depressurization, making it safer. During pressurization, the hydraulic oil flow carries the scrap steel balls away from the oil passage until they contact several limiting plates. At this point, a gap is formed between the scrap steel balls and the inner wall of the flow restrictor, allowing the hydraulic oil flowing from the oil passage to pass through the gap, which, combined with the flow rate of the main oil passage groove, allows the hydraulic oil to flow through the gap. This design increases the flow rate of the pipe joint when the hydraulic system is pressurized, facilitating the use of the hydraulic system. The utilization of waste steel balls reduces the production cost of pipe joints, thus protecting the environment. The flow restrictor is designed in the shape of a frustum with both ends connected, allowing waste steel balls of different sizes to abut against the inner wall of the flow restrictor, improving its adaptability to different waste steel balls. The limiting plate restricts the movement range of the waste steel balls, and by reducing the movement range of the waste steel balls, the waste steel balls can quickly block the oil passage, reducing the response time of reduced pipe joint flow and improving the safety of the hydraulic system.

[0009] The present invention is further configured such that: a plurality of the limiting pieces are formed by stamping a flow limiting member, a plurality of secondary oil passage grooves are formed by stamping on the flow limiting member, and the limiting pieces are integrally formed with one side of the secondary oil passage grooves.

[0010] By adopting the above technical solution, a groove is stamped into the flow restrictor, and then the limiting plate is formed by bending the part inside the groove. At the same time, the secondary oil passage groove is formed, which simplifies the production of the flow restrictor. The secondary oil passage groove can accommodate hydraulic oil, increasing the overall throughput of the pipe joint, thereby reducing the size of the internal hole of the joint body. The wall thickness of the joint body is increased accordingly, improving the strength of the joint body. The limiting plate is bent after the scrap steel ball is put into the flow restrictor, which facilitates the fixation of the scrap steel ball, making it move only within the flow restrictor. The flow restrictor can accommodate scrap steel balls of different sizes. For scrap steel balls of different sizes, only the bending degree of the limiting plate needs to be adjusted, which improves the compatibility between the flow restrictor and the scrap steel ball and facilitates mass production.

[0011] The present invention is further configured such that: the large end edge of the current limiting component is provided with a retaining arc facing away from the center of the current limiting component and arranged in an arc shape, and both ends of the retaining arc are provided with retaining spring clamp holes, and the inner peripheral wall of the connector body is provided with an annular groove for accommodating the retaining arc.

[0012] By adopting the above technical solution, the snap ring clamp is inserted into the snap ring clamp hole, thereby causing the snap ring arc to deform inward, which facilitates the insertion of the current limiting component into the connector body until the snap ring arc is aligned with the annular groove. After releasing the snap ring clamp, the current limiting component returns to its original state, and the snap ring arc is embedded in the annular groove, thereby fixing the current limiting component and the connector body. This makes the installation of the current limiting component simpler and faster, and facilitates production.

[0013] The present invention is further configured such that the connector body can be a straight connector body or a right-angle connector body.

[0014] A manufacturing process for a one-way flow-limiting pipe fitting, used to produce the one-way flow-limiting pipe fitting of claim 3, includes the following steps:

[0015] The forming of S1 waste steel balls and current limiting components and their assembly;

[0016] S2 connector body forming: cutting raw materials, drilling and milling to form connector body, milling annular grooves on the inner wall of connector body, and then electroplating connector body to form a plating layer on its surface;

[0017] S3 completes the installation of the connector body and the current limiting component by inserting the arc into the annular groove;

[0018] Steps S1 and S2 can be performed in any order or simultaneously.

[0019] Step S1 includes the refurbishment of waste steel balls.

[0020] By adopting the above technical solution, the refurbishment of waste steel balls can avoid the waste steel balls affecting the quality of hydraulic oil. The assembly of waste steel balls and flow restrictors is relatively simple when they are outside the joint body. In order to facilitate production, the assembly of waste steel balls and flow restrictors needs to be completed outside. After assembly, the flow restrictor can be easily embedded into the joint body by squeezing the two ends of the snap ring with snap ring pliers. After opening, the snap ring is restored and embedded into the ring groove to complete the forming of the pipe joint.

[0021] The present invention is further configured such that the refurbishment of waste steel balls includes the following steps:

[0022] A1 is used for surface rust removal treatment of waste steel balls;

[0023] A2 forms a protective layer on the surface of waste steel balls.

[0024] By adopting the above technical solutions, rust removal treatment can prevent rust on the surface of scrap steel balls from affecting the quality of hydraulic oil, and the protective layer can make scrap steel balls more stable in the hydraulic system, thereby maintaining the effective operation of the hydraulic system.

[0025] The present invention is further configured such that step S1 also includes:

[0026] A3 stamping produces highly elastic metal sheets, forming a fan-shaped metal sheet.

[0027] A4 punches several C-shaped grooves on the metal sheet to form several oil passage grooves and limiting pieces, and punches circlip clamp holes at both ends of the outer edge of the metal sheet.

[0028] The outer edge of the A5 bent metal sheet forms a retaining arc, and the bent metal sheet forms a flow restrictor. The main oil channel groove of the flow restrictor is formed by the two sides of the metal sheet at intervals, and the arc-shaped inner edge of the metal sheet forms the small end of the flow restrictor, and the arc-shaped outer edge of the metal sheet forms the large end of the flow restrictor.

[0029] A6 places the refurbished waste steel balls into the current limiting component and bends several limiting plates toward the center of the current limiting component, so that the waste steel balls are limited between the limiting plates and the small end of the current limiting component.

[0030] Steps A3-A5 can be performed in the same order as or simultaneously with the refurbishment of waste steel balls.

[0031] By adopting the above technical solution, the flow restrictor can be formed by stamping and bending metal sheets. Similarly, the arc clamp can be formed by bending metal sheets. After the part of the groove in the U-shaped setting is squeezed, the secondary oil passage groove and the limiting piece can be formed at the same time. The main oil passage groove and the oil passage opening are also formed during the bending process of the metal sheet, which makes the production of the flow restrictor more convenient. The limiting piece is bent after the waste steel ball is put into the flow restrictor, which makes it easier to fix the waste steel ball and make it move only within the flow restrictor. The flow restrictor can accommodate waste steel balls of different sizes. For waste steel balls of different sizes, only the bending degree of the limiting piece needs to be adjusted, which improves the compatibility between the flow restrictor and the waste steel ball and facilitates mass production.

[0032] The present invention is further configured such that: step A1 includes placing a metal rust remover in the reaction tank, immersing a number of scrap steel balls in the reaction tank and keeping them there for 5-10 minutes;

[0033] Step A2 includes pickling the waste steel balls and electroplating the pickled waste steel balls to form a protective layer.

[0034] By adopting the above technical solutions, metal rust remover can quickly remove rust and pollutants from the surface of scrap steel balls without damaging the base material. Pickling can remove the oxide layer on the surface of scrap steel balls and improve the adhesion of the protective layer after electroplating.

[0035] In summary, the present invention has the following beneficial effects: During the depressurization process of the hydraulic system, the hydraulic oil flow carries the scrap steel balls toward the oil passage until the scrap steel balls touch the inner wall of the flow restrictor, thereby blocking the oil passage and allowing the hydraulic oil to flow only through the main oil passage groove, reducing the hydraulic oil flow during depressurization and making it safer. During pressurization, the hydraulic oil flow carries the scrap steel balls away from the oil passage until they touch several limiting plates. At this time, a gap is formed between the scrap steel balls and the inner wall of the flow restrictor, allowing the hydraulic oil flowing from the oil passage to pass through the gap, which, in conjunction with the main oil passage groove... The flow rate is increased, thereby improving the flow rate of the pipe joint when the hydraulic system is pressurized, facilitating the use of the hydraulic system. The utilization of waste steel balls can reduce the production cost of pipe joints and play a role in protecting the environment. The flow restrictor is set in a frustum shape with both ends connected, so that waste steel balls of different sizes can abut against the inner wall of the flow restrictor, improving the adaptability to different waste steel balls. The limiting plate can limit the movement range of the waste steel balls, and by reducing the movement range of the waste steel balls, the waste steel balls can quickly block the oil passage, reduce the response time of the reduced flow rate of the pipe joint, and improve the safety of the hydraulic system. Attached Figure Description

[0036] Figure 1 Cross-sectional view of the present invention Figure 1 ;

[0037] Figure 2 for Figure 1 Enlarged diagram of section A in the middle;

[0038] Figure 3 This is a schematic diagram of the structure of the present invention;

[0039] Figure 4 This is a schematic diagram of the current limiting component in this invention;

[0040] Figure 5 This is a schematic diagram of the structure of the metal sheet in this invention;

[0041] Figure 6 Cross-sectional view of the present invention Figure 2 .

[0042] In the diagram: 1. Connector body; 2. Flow limiting component; 3. Scrap steel ball; 4. Main oil passage groove; 5. Oil passage opening; 6. Limiting plate; 7. Secondary oil passage groove; 8. Snap ring; 9. Snap ring clamp hole; 10. Ring groove; 11. Metal sheet. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] Example 1: A one-way flow-limiting pipe connector, such as Figure 1-4As shown, the device includes a connector body 1, a flow restrictor 2, and scrap steel balls 3. The connector body 1 is a straight-through connector body 1. The flow restrictor 2 is a frustum-shaped device with both ends connected, and all parts of the flow restrictor 2 have the same wall thickness. The flow restrictor 2 is coaxially arranged with the connector body 1 and is snapped onto the inner wall of the connector body 1. Specifically, the large end edge of the flow restrictor 2 has a retaining arc 8 facing away from the center of the flow restrictor 2 and arranged in a superior arc shape. Both ends of the retaining arc 8 are stamped with retaining spring clamp holes 9. The inner peripheral wall of the connector body 1 has a commutation hole. The annular groove 10 of the Naka arc 8 has a main oil passage groove 4 on the outer wall of the flow restrictor 2 that communicates with its interior. The small end of the flow restrictor 2 has an oil passage opening 5. Several limiting pieces 6 are integrally formed inside the flow restrictor 2. Specifically, the several limiting pieces 6 are formed by stamping the flow restrictor 2. Several secondary oil passage grooves 7 are formed by stamping on the flow restrictor 2. The limiting pieces 6 and one side of the secondary oil passage grooves 7 are integrally formed. The waste steel ball 3 is located between the several limiting pieces 6 and the oil passage opening 5, and the diameter of the waste steel ball 3 is smaller than the aperture of the oil passage opening 5.

[0045] A manufacturing process for a one-way flow-limiting pipe fitting, such as Figure 1-5 As shown, the production of the unidirectional flow-limiting pipe fitting in Embodiment 1 includes the following steps:

[0046] The forming and assembly of the scrap steel balls 3 and the flow restrictor 2, specifically including steps A1-A6, wherein A1 and A2 are the refurbishment treatment of the scrap steel balls 3. A1 performs surface rust removal treatment on the scrap steel balls 3, including placing a metal rust remover in the reaction tank and immersing several scrap steel balls 3 in the reaction tank for 5-10 minutes; A2 generates a protective layer on the surface of the scrap steel balls 3, including pickling the scrap steel balls 3 and electroplating the pickled scrap steel balls 3 to form a protective layer; A3-A6 specifically involves: A3 stamping a highly elastic metal sheet 11 to form a fan-shaped metal sheet 11; A4 stamping several C-shaped grooves on the metal sheet 11 to form several The auxiliary oil passage groove 7 and the limiting piece 6 are formed, and the retaining spring clamp holes 9 are stamped at both ends of the outer edge of the metal sheet 11; A5 bends the outer edge of the metal sheet 11 to form the retaining arc 8, and bends the metal sheet 11 to form the flow limiting member 2. The main oil passage groove 4 of the flow limiting member 2 is formed by the two sides of the metal sheet 11 at intervals, and the arc-shaped inner edge of the metal sheet 11 forms the small end of the flow limiting member 2, and the arc-shaped outer edge of the metal sheet 11 forms the large end of the flow limiting member 2; A6 puts the refurbished waste steel ball 3 into the flow limiting member 2, and bends several limiting pieces 6 toward the center of the flow limiting member 2 so that the waste steel ball 3 is limited between the limiting piece 6 and the small end of the flow limiting member 2; wherein steps A3-A5 can be performed in the order of replacement of the refurbishment of the waste steel ball 3 or simultaneously.

[0047] Forming of S2 connector body 1: The raw material is cut into a bar and formed into connector body 1 by drilling and milling. An annular groove 10 is milled into the inner wall of connector body 1. Then, connector body 1 is electroplated to form a plating layer on its surface.

[0048] S3 completes the installation of the connector body 1 and the current limiting component 2 by embedding the arc 8 into the annular groove 10;

[0049] Steps S1 and S2 can be performed in any order or simultaneously.

[0050] Working Principle: In terms of production process, the refurbishment of scrap steel balls 3 can prevent them from affecting the quality of hydraulic oil. Specifically, metal rust remover can quickly remove rust and contaminants from the surface of the scrap steel balls 3 without damaging the base material. Rust removal treatment can prevent rust on the surface of the scrap steel balls 3 from affecting the quality of hydraulic oil. Pickling can remove the oxide layer on the surface of the scrap steel balls 3, improve the adhesion of the protective layer after electroplating, and the protective layer can make the scrap steel balls 3 more stable in the hydraulic system, thereby maintaining the effective operation of the hydraulic system. When the scrap steel ball 3 and the current limiting component 2 are outside the connector body 1, the assembly is relatively simple. However, for the convenience of production, the assembly of the scrap steel ball 3 and the current limiting component 2 needs to be completed outside. After assembly, the current limiting component 2 is inserted into the snap ring pliers hole 9 by snap ring pliers, which causes the snap ring 8 to deform inward, making it easier to put the current limiting component 2 into the connector body 1 until the snap ring 8 is aligned with the annular groove 10. After releasing the snap ring pliers, the current limiting component 2 returns to its original position, and the snap ring 8 is inserted into the annular groove 10, thereby fixing the current limiting component 2 and the connector body 1. This makes the installation of the current limiting component 2 simpler and faster, and facilitates production.

[0051] The flow restrictor 2 can be formed by stamping and bending a metal sheet 11. Similarly, the retaining arc 8 is formed by bending a metal sheet 11. After the part of the groove in the groove is squeezed, the auxiliary oil channel groove 7 and the limiting piece 6 can be formed at the same time. The main oil channel groove 4 and the oil channel opening 5 are also formed during the bending process of the metal sheet 11, which makes the production of the flow restrictor 2 more convenient. The limiting piece 6 is bent after the waste steel ball 3 is put into the flow restrictor 2, which makes it easier to fix the waste steel ball 3 and make it only move within the flow restrictor 2. The flow restrictor 2 can accommodate waste steel balls 3 of different sizes. For waste steel balls 3 of different sizes, only the bending degree of the limiting piece 6 needs to be adjusted, which improves the compatibility between the flow restrictor 2 and the waste steel ball 3 and facilitates mass production.

[0052] When the pipe joint is in use, during the depressurization process of the hydraulic system, the hydraulic oil flow drives the scrap steel ball 3 towards the oil passage 5 until the scrap steel ball 3 touches the inner wall of the flow restrictor 2, thus blocking the oil passage 5. This allows the hydraulic oil to flow only through the main oil passage groove 4 and the auxiliary oil passage groove 7, reducing the hydraulic oil flow during depressurization and making it safer. When the hydraulic system is pressurized, the hydraulic oil flow drives the scrap steel ball 3 away from the oil passage 5 until it touches several limiting plates 6. At this time, a gap is formed between the scrap steel ball 3 and the inner wall of the flow restrictor 2, allowing the hydraulic oil flowing from the oil passage 5 to pass through the gap. Combined with the flow of the main oil passage groove 4 and the auxiliary oil passage groove 7, this increases the flow of the pipe joint when the hydraulic system is pressurized, facilitating the use of the hydraulic system. The auxiliary oil passage groove 7 can accommodate the hydraulic oil, increasing the overall flow of the pipe joint, thereby reducing the size of the inner hole of the joint body 1. The wall thickness of the joint body 1 is correspondingly increased, improving the strength of the joint body 1.

[0053] The utilization of waste steel balls 3 can reduce the production cost of pipe fittings and play a role in protecting the environment. The flow restrictor 2 is set in the shape of a frustum with both ends connected, so that waste steel balls 3 of different sizes can all abut against the inner wall of the flow restrictor 2, improving the adaptability to different waste steel balls 3. The limiting piece 6 can limit the movement range of waste steel balls 3, and by reducing the movement range of waste steel balls 3, the waste steel balls 3 can quickly block the oil passage 5, reduce the response time of reduced pipe fitting flow, and improve the safety of the hydraulic system.

[0054] Example 2: A one-way flow-limiting pipe connector, such as Figure 4 and Figure 6 As shown, the device includes a connector body 1, a flow restrictor 2, and scrap steel balls 3. The connector body 1 is a right-angle connector body 1. The flow restrictor 2 is a frustum-shaped device with both ends connected, and all parts of the flow restrictor 2 have the same wall thickness. The flow restrictor 2 is coaxially arranged with the connector body 1 and is snapped onto the inner wall of the connector body 1. Specifically, the large end edge of the flow restrictor 2 has a retaining arc 8 facing away from the center of the flow restrictor 2 and arranged in a superior arc shape. Both ends of the retaining arc 8 are stamped with retaining spring clamp holes 9. The inner peripheral wall of the connector body 1 has a commutation hole. The annular groove 10 of the Naka arc 8 has a main oil passage groove 4 on the outer wall of the flow restrictor 2 that communicates with its interior. The small end of the flow restrictor 2 has an oil passage opening 5. Several limiting pieces 6 are integrally formed inside the flow restrictor 2. Specifically, the several limiting pieces 6 are formed by stamping the flow restrictor 2. Several secondary oil passage grooves 7 are formed by stamping on the flow restrictor 2. The limiting pieces 6 and one side of the secondary oil passage grooves 7 are integrally formed. The waste steel ball 3 is located between the several limiting pieces 6 and the oil passage opening 5, and the diameter of the waste steel ball 3 is smaller than the aperture of the oil passage opening 5.

[0055] A manufacturing process for a one-way flow-limiting pipe fitting, such as Figure 4-6 As shown, the production of the unidirectional flow-limiting pipe fitting in Embodiment 2 includes the following steps:

[0056] The forming and assembly of the scrap steel balls 3 and the flow restrictor 2, specifically including steps A1-A6, wherein A1 and A2 are the refurbishment treatment of the scrap steel balls 3. A1 performs surface rust removal treatment on the scrap steel balls 3, including placing a metal rust remover in the reaction tank and immersing several scrap steel balls 3 in the reaction tank for 5-10 minutes; A2 generates a protective layer on the surface of the scrap steel balls 3, including pickling the scrap steel balls 3 and electroplating the pickled scrap steel balls 3 to form a protective layer; A3-A6 specifically involves: A3 stamping a highly elastic metal sheet 11 to form a fan-shaped metal sheet 11; A4 stamping several C-shaped grooves on the metal sheet 11 to form several The auxiliary oil passage groove 7 and the limiting piece 6 are formed, and the retaining spring clamp holes 9 are stamped at both ends of the outer edge of the metal sheet 11; A5 bends the outer edge of the metal sheet 11 to form the retaining arc 8, and bends the metal sheet 11 to form the flow limiting member 2. The main oil passage groove 4 of the flow limiting member 2 is formed by the two sides of the metal sheet 11 at intervals, and the arc-shaped inner edge of the metal sheet 11 forms the small end of the flow limiting member 2, and the arc-shaped outer edge of the metal sheet 11 forms the large end of the flow limiting member 2; A6 puts the refurbished waste steel ball 3 into the flow limiting member 2, and bends several limiting pieces 6 toward the center of the flow limiting member 2 so that the waste steel ball 3 is limited between the limiting piece 6 and the small end of the flow limiting member 2; wherein steps A3-A5 can be performed in the order of replacement of the refurbishment of the waste steel ball 3 or simultaneously.

[0057] Forming of S2 connector body 1: The raw material is cut into steel ingots, which are drilled and milled to form connector body 1. An annular groove 10 is milled into the inner wall of connector body 1. Then, connector body 1 is electroplated to form a plating layer on its surface.

[0058] S3 completes the installation of the connector body 1 and the current limiting component 2 by embedding the arc 8 into the annular groove 10;

[0059] Steps S1 and S2 can be performed in any order or simultaneously.

[0060] Working principle: Same as in Example 1.

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A one-way flow restriction tube fitting, characterized by: It includes a joint body (1), a flow-limiting part (2) and waste steel balls (3). The flow-limiting part (2) is clamped on the inner wall of the joint body (1). The flow-limiting part (2) is arranged in a frustum shape with both ends communicating, and the wall thickness of each part of the flow-limiting part (2) is the same. The flow-limiting part (2) is coaxially arranged with the joint body (1). A main oil channel groove (4) communicating with its interior is formed on the outer wall of the flow-limiting part (2). The flow-limiting part (2) is formed by bending a fan-shaped metal sheet (11). The main oil channel groove (4) of the flow-limiting part (2) is formed by the interval between the two sides of the metal sheet (11). An oil port (5) is formed at the small end of the flow-limiting part (2). A number of limiting sheets (6) are fixedly connected inside the flow-limiting part (2). The waste steel balls (3) are located between a number of limiting sheets (6) and the oil port (5), and the diameter of the waste steel balls (3) is smaller than the aperture of the oil port (5). A number of the limiting sheets (6) are formed by stamping on the flow-limiting part (2). A number of auxiliary oil channel grooves (7) are formed by stamping on the flow-limiting part (2). The limiting sheet (6) is integrally formed with one side of the auxiliary oil channel groove (7). A number of U-shaped cutting grooves are stamped on the metal sheet (11) to form the above-mentioned number of auxiliary oil channel grooves (7) and limiting sheets (6). An arc-shaped clamping arc (8) facing away from the center of the flow-limiting part (2) is provided at the large end edge of the flow-limiting part (2). Both ends of the clamping arc (8) are provided with clip spring pliers holes (9). A ring groove (10) for accommodating the clamping arc (8) is formed on the inner peripheral wall of the joint body (1).

2. The one-way flow-limiting pipe joint according to claim 1, characterized in that: The joint body (1) is a straight-through joint body or a right-angle joint body.

3. A manufacturing process for a one-way flow-limiting pipe fitting, used to produce the one-way flow-limiting pipe fitting of claim 1, characterized in that: It includes the following steps: S1 The forming of the waste steel balls (3) and the flow-limiting part (2) and the assembly of the two; S2 The forming of the joint body (1): cutting the raw material, forming the joint body (1) through drilling and milling, milling and processing a ring groove (10) on the inner wall of the joint body (1), and then electroplating the joint body (1) to form a coating on its surface; S3 Installing the joint body (1) and the flow-limiting part (2) by embedding the clamping arc (8) into the ring groove (10); Among them, the order of steps S1 and S2 can be arbitrarily changed or carried out simultaneously; Step S1 includes the renovation treatment of the waste steel balls (3).

4. The manufacturing process of a unidirectional flow-limiting pipe joint according to claim 3, characterized in that: The renovation treatment of the waste steel balls (3) includes the following steps: A1 Conducting surface rust removal treatment on the waste steel balls (3); A2 Generating a protective layer on the surface of the waste steel balls (3).

5. The manufacturing process of a unidirectional flow-limiting pipe joint according to claim 3, characterized in that: Step S1 also includes: A3 Stamping a metal sheet (11) with high elasticity to form a fan-shaped metal sheet (11); A4 Stamping a number of U-shaped cutting grooves on the metal sheet (11) to form a number of auxiliary oil channel grooves (7) and limiting sheets (6), and stamping clip spring pliers holes (9) at both ends of the outer edge of the metal sheet (11); A5 Bending the outer edge of the metal sheet (11) to form the clamping arc (8), bending the metal sheet (11) to form the flow-limiting part (2). The main oil channel groove (4) of the flow-limiting part (2) is formed by the interval between the two sides of the metal sheet (11), and the arc-shaped inner edge of the metal sheet (11) forms the small end of the flow-limiting part (2), and the arc-shaped outer edge of the metal sheet (11) forms the large end of the flow-limiting part (2); A6 places the refurbished waste steel ball (3) into the flow restrictor (2) and bends several limiting plates (6) toward the center of the flow restrictor (2) so that the waste steel ball (3) is limited between the limiting plates (6) and the small end of the flow restrictor (2); Steps A3-A5 can be performed in the order of replacement or simultaneously with the refurbishment of waste steel balls (3).

6. The manufacturing process of a unidirectional flow-limiting pipe joint according to claim 4, characterized in that: Step A1 includes placing a metal rust remover in the reaction tank, immersing several scrap steel balls (3) in the reaction tank and keeping them for 5-10 minutes; Step A2 includes pickling the waste steel balls (3) and electroplating the pickled waste steel balls (3) to form a protective layer.

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