High-pressure transition joint for press fitting of coupling

Abstract

The utility model relates to the field of connection of couplings and high-pressure oil pipes, and particularly discloses a high-pressure transition joint for press fitting of couplings, which comprises a first fastening nut, an oil pipe joint, a second fastening nut and a workpiece transition joint. The oil pipe connector is an L-shaped connector, an oil way is machined in the oil pipe connector, one end of the oil pipe connector is connected with a high-pressure oil pipe through a first fastening nut, the other end of the oil pipe connector is connected with one end of the workpiece transition connector through a second fastening nut, and the other end of the workpiece transition connector is of a hemispherical sealing structure and used for being connected with a coupling oil injection hole. By designing the coupling press-fitting high-pressure transition joint, the problem that the mounting size of the high-pressure oil pipe and the mounting size of the coupling oil filling hole are inconsistent is solved, rapid mounting and dismounting of the coupling press-fitting high-pressure oil pipe and the coupling oil filling hole are achieved, and complex size conversion operation does not need to be conducted every time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coupling and high pressure oil pipe connection, concretely relates to a high pressure transition joint for coupling pressure equipment. BACKGROUND

[0002] Coupling is an important component in mechanical transmission system, which is used to connect two shafts to transmit torque, and allow a certain angular deviation, for example, drum type tooth coupling is installed in EMU and urban rail vehicle for flexible connection of motor and gear box; In the installation and maintenance process of coupling, high pressure oil pipe is needed for oil injection operation to ensure the normal operation of coupling; At present, the installation size of oil pipe joint meeting the use requirement of 400MPa super high pressure is inconsistent with the installation size of coupling oil injection hole, at the same time, because one end of high pressure oil pipe is connected with high pressure oil injection pump and cannot be installed rotationally, and the other end is installed to coupling oil injection hole and also cannot be installed rotationally, leading to frequent installation and disassembly of high pressure oil pipe head and easy damage, if the head is damaged, the whole high pressure oil pipe needs to be replaced, which is high in cost, therefore, a new high pressure transition joint is needed to connect high pressure oil pipe and coupling oil injection hole.

[0003] Although various high-pressure oil pipe joints have appeared on the market, for example, a high-pressure oil pipe joint with a guide device is disclosed in a patent with the patent publication number CN215408946U, which comprises a high-pressure oil pipe, a coupling nut and a conical washer, the front end of the high-pressure oil pipe is provided with a stub, the front end of the stub is provided with a guide device, the guide device cooperates with the guide groove of the external high-pressure oil pipe joint to realize the accurate centering of the high-pressure oil pipe stub axis and the external high-pressure oil pipe joint axis. In a patent with the patent publication number CN217843024U, a high-pressure oil pipe joint assembly is disclosed, which comprises a female head, a male head and a connecting piece, wherein the female head comprises a female head outer wall annular groove in the middle, an annular oil pipe clamping cavity on the outside and an annular boss on the inside, the male head comprises a male head hex in the middle and male head outer thread segments on both sides, and the connecting piece comprises a clamping segment clamped on the female head outer wall annular groove and a connecting piece inner thread segment for connecting with the male head outer thread segment. In addition, a long-life high-pressure oil pipe sealing joint is disclosed in a patent with the patent publication number CN105135100A, which comprises a hollow plug connected to a high-pressure oil pipe, a sleeve nut and a spin-in straight-through joint with an oil passage in the middle, wherein the plug is spherical relative to one end of the spin-in straight-through joint, the end of the spin-in straight-through joint connected to the sleeve nut is centrally provided with a cylindrical recess, a cylindrical ceramic insert is arranged in the cylindrical recess, and a tapered recess and an oil passage hole are formed in the middle of the ceramic insert. In a patent with the patent publication number CN220082374U, a high-pressure oil pipe joint connecting structure is disclosed, which is composed of a fuel injection nozzle assembly and an oil pipe assembly, wherein the fuel injection nozzle assembly comprises a connecting seat and a sleeve, the connecting seat is provided with an oil passage channel penetrating through the connecting seat, the oil pipe assembly comprises a pipe joint nut, a joint and a connecting pipe. However, the high-pressure oil pipe joints in the prior art cannot be directly used in shaft coupling pressure assembly, and cannot be directly matched with the oil injection hole of the shaft coupling. Practical new type content

[0004] In order to solve the technical problems that the installation size of the high-pressure oil pipe of the shaft coupling and the oil injection hole of the shaft coupling is inconsistent, the two ends of the oil pipe cannot be installed and rotated, and the head is easily damaged due to frequent installation and disassembly of the high-pressure oil pipe, a high-pressure transition joint for shaft coupling pressure assembly is provided, which realizes the quick installation and disassembly of the high-pressure oil pipe of the shaft coupling pressure assembly and the oil injection hole of the shaft coupling, improves the operation efficiency of the shaft coupling pressure assembly, solves the problem of frequent damage of the oil pipe joint, and reduces the maintenance cost.

[0005] The technical scheme adopted by the utility model to solve its technical problems is to provide a high-pressure transition joint for shaft coupling pressure assembly, which comprises:

[0006] The oil pipe joint is an L-shaped joint, an oil passage is processed in the inside, the oil passage is a variable-diameter oil passage, and the diameter gradually increases along the flow direction of the high-pressure oil;

[0007] The first fastening nut is used for connecting the oil pipe joint with the high-pressure oil pipe.

[0008] The second fastening nut is used for connecting the oil pipe joint with the workpiece transition joint.

[0009] The workpiece transition joint is internally provided with an oil channel, and the oil channel is a variable-diameter oil channel,

[0010] The diameter gradually decreases along the flow direction of the high-pressure oil, and the workpiece transition joint and the coupling oil injection hole matching end are in a half-sphere sealing structure.

[0011] Preferably, the end head of the oil pipe joint connected with the high-pressure oil pipe is in a conical structure, and a section of external thread matched with the first fastening nut is formed at the end.

[0012] Preferably, the diameter of the oil channel in the section of conical structure and the section of external thread in the oil pipe joint is smaller than the diameter of the oil channel in other sections of the oil pipe joint.

[0013] Preferably, the end of the oil pipe joint matched with the second fastening nut is in a cylindrical section, and is provided with a stepped structure.

[0014] Preferably, the first fastening nut internally comprises a section of smooth hole and a section of threaded hole, and the diameter of the smooth hole is smaller than the diameter of the threaded hole.

[0015] Preferably, the threaded hole is matched with the thread of the oil pipe joint.

[0016] Preferably, the second fastening nut comprises a section of external thread, and a smooth hole penetrating through both ends of the second fastening nut is internally arranged.

[0017] Preferably, the section of external thread is matched with the internal thread hole of the workpiece transition joint.

[0018] Preferably, the workpiece transition joint is internally arranged with a section of internal thread hole, a section of large-diameter smooth hole and a section of small-diameter smooth hole along the axial direction in sequence, and the outer periphery of the joint part corresponding to the section of small-diameter smooth hole is provided with external thread.

[0019] Preferably, the external thread is matched with the stop nut.

[0020] The beneficial effects of the utility model lie in:

[0021] 1. The utility model discloses a high-pressure transition joint for coupling pressure assembly, solves the problem that the installation size of the high-pressure oil pipe and the coupling oil injection hole is inconsistent, realizes the quick installation and disassembly of the coupling pressure assembly high-pressure oil pipe and the coupling oil injection hole, and complex size conversion operation is not needed each time.

[0022] 2. The utility model discloses a high-pressure oil transmission is realized through the internal oil circuit of oil pipe joint, workpiece transition joint,

[0023] 3. The utility model discloses a modular design, when the oil pipe joint head is damaged, only need to replace the damaged component instead of the whole high-pressure oil pipe, effectively solve the problem of frequent damage of oil pipe joint, and the maintenance cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is high-pressure transition joint structure schematic diagram,

[0025] Figure 2 It is oil pipe joint structure diagram,

[0026] Fig. 3 (a), 3 (b) is the structure diagram of first fastening nut,

[0027] Fig. 4 (a), 4 (b) is the structure diagram of second fastening nut,

[0028] Fig. 5 (a), 5 (b) is the schematic diagram of workpiece transition joint,

[0029] Figure 6 It is stop nut structure diagram,

[0030] Fig. 1. first fastening nut, 2. oil pipe joint, 3. second fastening nut, 4. workpiece transition joint, DETAILED DESCRIPTION

[0031] The utility model will be further explained in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] Embodiment 1:

[0033] This embodiment provides a kind of high-pressure transition joint for coupling pressure loading, as shown in Fig. Figure 1 Including first fastening nut 1, oil pipe joint 2, second fastening nut 3, workpiece transition joint 4;Oil pipe joint 2 is L-shaped joint, and oil circuit is processed inside, the oil circuit is variable diameter oil circuit, along the flow direction of high-pressure oil, diameter variable gradually becomes larger;Its one end is connected with high-pressure oil pipe through first fastening nut 1, and the other end is connected with the one end of workpiece transition joint 4 through second fastening nut 3, and the other end of workpiece transition joint 4 is half-ball seal structure, for connecting coupling oil injection hole;The oil circuit is processed inside the workpiece transition joint, the oil circuit is variable diameter oil circuit, along the flow direction of high-pressure oil

[0034] , diameter variable gradually becomes smaller;

[0035] Specifically, as shown in Figure 2As shown, the end of the tubing connector 2 connected with the high-pressure oil pipe is conical structure, and a section of external thread is machined at the end to match the first fastening nut 1. The oil passage diameter inside the conical structure and the external thread section of the tubing connector 2 is smaller than the oil passage diameter of other sections of the tubing connector 2. The end of the tubing connector 2 matched with the second fastening nut 3 is a cylindrical section, and a step structure is arranged.

[0036] As shown in FIG. 3(a) and FIG. 3(b), the first fastening nut 1 includes a section of smooth hole and a section of threaded hole inside, and the diameter of the smooth hole is smaller than the diameter of the threaded hole. The threaded hole matches with the tubing connector 2 in thread.

[0037] As shown in FIG. 5(a) and FIG. 5(b), the second fastening nut 3 includes a section of external thread section, and a smooth hole is arranged inside to pass through both ends. The external thread section matches with the internal threaded hole of the workpiece transition connector 4.

[0038] As shown in FIG. 4(a) and FIG. 4(b), the workpiece transition connector 4 includes a section of internal threaded hole, a section of large-diameter smooth hole, and a section of small-diameter smooth hole arranged inside along the axial direction in sequence. The outer periphery of the small-diameter smooth hole section of the connector part is provided with external thread, and the external thread matches with the stop nut to prevent the axial movement of the workpiece transition connector 4 during use.

[0039] In the embodiment, the L-shaped structure of the tubing connector 2 forms a 90-degree turning connection between the high-pressure oil pipe and the workpiece transition connector 4, which is convenient for installation in the case of limited space and can also solve the interference problem with other toolings. The conical structure end of the tubing connector 2 is connected with the high-pressure oil pipe, and a reliable sealing connection is formed through the pressing action of the first fastening nut 1. The other end of the tubing connector 2 is connected with the workpiece transition connector 4, and the stability of the connection is ensured through the fastening action of the second fastening nut 3. The hemispherical sealing structure end of the workpiece transition connector 4 is connected with the shaft coupling pressing equipment to form a good sealing effect.

[0040] The oil passage diameter inside the conical structure and the external thread section of the tubing connector 2 is designed to be smaller than the oil passage diameter of other sections, which can increase the oil flow rate and improve the working efficiency of the system. At the same time, the smaller oil passage diameter can also withstand higher working pressure, enhancing the safety performance of the entire connector.

[0041] The step structure arranged at the end of the tubing connector 2 matched with the second fastening nut 3 can prevent the axial displacement of the second fastening nut 3 during fastening, ensuring the stability and reliability of the connection.

[0042] The design of the light hole and threaded hole structure inside the first fastening nut 1 allows the high-pressure oil pipe to pass through the light hole smoothly, while the threaded hole matches the external threads of the oil pipe joint 2 to form a fastening connection. The design of the light hole with a smaller diameter than the threaded hole forms a stepped structure, which can position and support the oil pipe joint 2.

[0043] The external threaded section of the second fastening nut 3 matches the internal threaded hole of the workpiece transition joint 4, and by rotating the second fastening nut 3, the oil pipe joint 2 and the workpiece transition joint 4 can be tightly connected together. The through light hole inside the second fastening nut 3 allows oil to pass through, ensuring the connectivity of the oil circuit.

[0044] The three-section different structure design inside the workpiece transition joint 4 allows it to form connections with the second fastening nut 3 and the shaft coupling oil inlet hole, respectively. The internal threaded hole is used to match the external threads of the second fastening nut 3, the large-diameter light hole and the small-diameter light hole form oil passages to ensure smooth flow of oil. The external threads corresponding to the small-diameter light hole section are provided on the outer periphery to match the stop nut, preventing the workpiece transition joint 4 from moving axially during use.

[0045] In actual application, first, the high-pressure oil pipe is passed through the light hole of the first fastening nut 1, then the tapered end of the oil pipe joint 2 is connected to the high-pressure oil pipe, and the first fastening nut 1 is tightened to match the external threads of the oil pipe joint 2, thereby tightly connecting the high-pressure oil pipe and the oil pipe joint 2. Next, the second fastening nut 3 is fitted on the cylindrical section of the oil pipe joint 2, then the cylindrical section of the oil pipe joint 2 is inserted into the internal threaded hole of the workpiece transition joint 4, and the second fastening nut 3 is tightened to match the external threads with the internal threaded hole of the workpiece transition joint 4, thereby tightly connecting the oil pipe joint 2 and the workpiece transition joint 4. Finally, the hemispherical sealing structure end of the workpiece transition joint 4 is connected to the shaft coupling press fitting equipment, and the stop nut is installed on the external threads of the workpiece transition joint 4, completing the installation of the high-pressure transition joint for shaft coupling press fitting.

[0046] Example 2:

[0047] This example provides another high-pressure transition joint for shaft coupling press fitting, which has the same basic structure as Example 1, including a first fastening nut 1, an oil pipe joint 2, a second fastening nut 3, and a workpiece transition joint 4. The difference lies in the shape and size of the oil pipe joint 2.

[0048] In this example, the oil pipe joint 2 is still an L-shaped joint, but its corner is 75 degrees instead of 90 degrees. This design is suitable for specific installation space requirements and can be used in some narrow or special angle installation environments.

[0049] The end of the oil pipe joint 2 connected with the high-pressure oil pipe is still a conical structure, and an outer thread matched with the first fastening nut 1 is processed at the end. The oil passage diameter in the conical structure and the outer thread section inside the oil pipe joint 2 is 3 mm, and the oil passage diameter of other sections of the oil pipe joint 2 is 5 mm. The design of the diameter difference of the oil passage can improve the working pressure of the system while ensuring sufficient flow.

[0050] The end of the oil pipe joint 2 matched with the second fastening nut 3 is a cylindrical section, and a stepped structure is arranged. The height of the stepped structure is 2 mm, which can effectively prevent the axial displacement of the second fastening nut 3 during the fastening process.

[0051] The first fastening nut 1 includes a light hole and a threaded hole inside. The diameter of the light hole is 10 mm, and the diameter of the threaded hole is 14 mm. The diameter of the light hole is smaller than that of the threaded hole, forming a stepped structure, which can position and support the oil pipe joint 2.

[0052] The second fastening nut 3 includes an outer thread section, and a light hole penetrating through both ends inside. The diameter of the outer thread section is 16 mm, and the diameter of the light hole is 12 mm. The outer thread section is matched with the internal thread hole of the workpiece transition joint 4, and by rotating the second fastening nut 3, the oil pipe joint 2 and the workpiece transition joint 4 can be tightly connected together.

[0053] The workpiece transition joint 4 includes an internal thread hole, a large-diameter light hole, and a small-diameter light hole arranged in sequence along the axial direction inside. The diameter of the internal thread hole is 16 mm, matched with the outer thread of the second fastening nut 3; the diameter of the large-diameter light hole is 12 mm, and the diameter of the small-diameter light hole is 8 mm. The small-diameter light hole section corresponds to the outer thread arranged on the outer periphery of the joint part, and the diameter of the outer thread is 20 mm, matched with the stop nut.

[0054] In this embodiment, the radius of the hemisphere of the hemisphere sealing structure end of the workpiece transition joint 4 is 10 mm, which can ensure good sealing effect with the shaft coupling oil injection hole.

[0055] Embodiment 3:

[0056] Another high-pressure transition joint for shaft coupling press fitting is provided in this embodiment, which has the same basic structure as embodiment 1, including a first fastening nut 1, an oil pipe joint 2, a second fastening nut 3, and a workpiece transition joint 4. The difference lies in the material selection and surface treatment.

[0057] In this embodiment, the tubing joint 2 and the workpiece transition joint 4 are made of 45 steel material, which is quenched and tempered to have a hardness of HRC 40-45, with high strength and wear resistance. The first fastening nut 1 and the second fastening nut 3 are made of 40Cr steel material, which is quenched and tempered to have a hardness of HRC 32-38, with good toughness and strength.

[0058] The conical structure end of the tubing joint 2 connected to the high-pressure oil pipe has a conical angle of 60 degrees, which can ensure good sealing effect with the high-pressure oil pipe. The conical structure surface is precisely machined to have a surface roughness Ra value of not more than 0.8 μm to ensure sealing performance.

[0059] The external thread of the tubing joint 2 and the internal thread of the first fastening nut 1 are both M14x1.5 fine thread, which can improve the fastening force and sealing performance of the connection. The external thread of the second fastening nut 3 and the internal thread of the workpiece transition joint 4 are both M16x1.5 fine thread, which can also improve the reliability of the connection.

[0060] The hemispherical sealing structure end of the workpiece transition joint 4 is precisely machined and polished to have a surface roughness Ra value of not more than 0.4 μm to ensure good sealing effect with the shaft coupling press-fitting equipment. The external thread on the outer periphery of the workpiece transition joint 4 is M20x1.5 fine thread, which cooperates with the stop nut to effectively prevent the workpiece transition joint 4 from moving axially during use.

[0061] In this embodiment, all parts are chrome plated to have a plating layer thickness of 0.02-0.03 mm, which can improve the corrosion resistance and wear resistance of the parts and prolong the service life.

[0062] Embodiment 4:

[0063] This embodiment provides a shaft coupling press-fitting high-pressure transition joint suitable for high-pressure hydraulic systems, which has the same basic structure as Embodiment 1, including a first fastening nut 1, a tubing joint 2, a second fastening nut 3, and a workpiece transition joint 4. The difference lies in the design parameters and applicable conditions.

[0064] In this embodiment, the shaft coupling press-fitting high-pressure transition joint is designed to have a maximum working pressure of 35 MPa, which is suitable for high-pressure hydraulic systems. The tubing joint 2 is an L-shaped joint with a 90-degree angle, and the internal oil passage is designed in a stepped manner to reduce flow resistance and pressure loss.

[0065] The end of the tubing joint 2 connected with the high-pressure oil pipe is conical, with a 45-degree angle, which can provide better sealing effect under high pressure. An external thread is formed on the end, which cooperates with the first fastening nut 1, with a specification of M16x1.5 and a length of 15 mm.

[0066] The diameter of the oil passage in the conical structure and the external thread section of the tubing joint 2 is 4 mm, while the diameter of the oil passage in other sections of the tubing joint 2 is 6 mm. This design of the oil passage diameter can provide sufficient flow under high pressure while ensuring the safety of the system.

[0067] The end of the tubing joint 2 cooperating with the second fastening nut 3 is a cylindrical section with a diameter of 18 mm and a length of 20 mm, and is provided with a stepped structure. The height of the stepped structure is 2.5 mm, and the diameter difference is 3 mm, which can effectively prevent the axial displacement of the second fastening nut 3 under high pressure.

[0068] The first fastening nut 1 includes a light hole and a threaded hole, with a diameter of 12 mm and a length of 15 mm. The diameter of the threaded hole is 16 mm, and the length is 18 mm. The diameter of the light hole is smaller than that of the threaded hole, forming a stepped structure, which can reliably position and support the tubing joint 2 under high pressure.

[0069] The second fastening nut 3 includes an external thread section with a specification of M18x1.5 and a length of 18 mm, and a light hole passing through both ends with a diameter of 14 mm. The external thread section cooperates with the internal thread hole of the workpiece transition joint 4, and by rotating the second fastening nut 3, the tubing joint 2 and the workpiece transition joint 4 can be tightly connected together, which can maintain stable connection even under high pressure.

[0070] The workpiece transition joint 4 has an internal thread hole, a large-diameter light hole, and a small-diameter light hole arranged along the axis direction in sequence. The internal thread hole has a specification of M18x1.5 and a length of 20 mm; the large-diameter light hole has a diameter of 14 mm and a length of 15 mm; and the small-diameter light hole has a diameter of 10 mm and a length of 25 mm. The outer periphery of the joint part corresponding to the small-diameter light hole section is provided with an external thread with a specification of M22x1.5 and a length of 22 mm, which cooperates with the stop nut.

[0071] In this embodiment, the radius of the hemisphere of the hemisphere sealing structure end of the workpiece transition joint 4 is 12 mm, which can ensure good sealing effect with the shaft coupling press fitting equipment under high pressure. The surface of the hemisphere is precisely machined and hardened, with a surface hardness of HRC50-55 and a surface roughness Ra value of not greater than 0.2 μm, to ensure the sealing performance and wear resistance under high pressure.

[0072] It should be noted that the high-pressure transition joint for coupling pressing of the embodiments 1, 2, 3 and 4 is one kind.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high pressure transition joint for use in press-fitting of a coupling, characterized by: The utility model relates to a kind of oil pipe joints, including: Oil pipe joint, the oil pipe joint is L-shaped joint, and oil passage is processed inside, the oil passage It is variable-diameter oil passage, gradually increases in diameter along the flow direction of high-pressure oil; First fastening nut, for connecting oil pipe joint and high-pressure oil pipe; Second fastening nut, for connecting oil pipe joint and workpiece transition joint; Workpiece transition joint, the oil passage is processed inside, and the oil passage is variable-diameter oil passage, gradually reduces in diameter along the flow direction of high-pressure oil;And workpiece transition joint and coupling oil hole cooperation end are hemispherical sealing structure. The head of the oil pipe joint connected with high-pressure oil pipe is conical structure, and a section of external thread matched with first fastening nut is processed in the end.

2. The high pressure transition joint for press fitting of a coupling as claimed in claim 1, wherein: The diameter of oil passage inside the conical structure and external thread section in the oil pipe joint is less than the diameter of oil passage of other sections of oil pipe joint.

3. The high pressure transition joint for press-fitting of a coupling as claimed in claim 2, characterized in that: The end of the oil pipe joint matched with second fastening nut is cylindrical section, and step structure is arranged.

4. The high pressure transition joint for press-fitting of a coupling as claimed in claim 2, characterized in that: The first fastening nut includes a section of smooth hole and a section of threaded hole, and the diameter of the smooth hole is less than the diameter of the threaded hole.

5. The high pressure transition joint for coupling press assembly as claimed in claim 1 wherein: The threaded hole is matched with the thread of oil pipe joint.

6. The high pressure transition joint for press-fitting of a coupling as claimed in claim 5, characterized in that: The second fastening nut includes a section of external thread, and smooth hole is arranged inside, which penetrates both ends.

7. The high pressure transition joint for coupling press assembly as claimed in claim 1 wherein: The external thread section is matched with the internal thread hole of workpiece transition joint.

8. The high pressure transition joint for press-fitting of a coupling as claimed in claim 7, characterized in that: The workpiece transition joint is sequentially provided with a section of internal thread hole, a section of large-diameter smooth hole and a section of small-diameter smooth hole along the axial direction, and the outer periphery of the joint part corresponding to the small-diameter smooth hole section is provided with external thread.

9. The high pressure transition joint for coupling press assembly as claimed in claim 1 wherein: The external thread is matched with stop nut.

10. The high pressure transition joint for press-fitting of a coupling as claimed in claim 9, characterized in that: ​

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