Steel pipe joint connecting structure of hydraulic system

Abstract

The utility model discloses a hydraulic system steel pipe joint connecting structure which comprises a steel pipe joint, a locking nut, a lining and a steel pipe, the left side of the steel pipe joint is used for being connected with hydraulic equipment, the right side of the steel pipe joint is provided with a mounting hole used for being inserted into the steel pipe, the peripheral face of the right side of the steel pipe joint is provided with external threads, and the lining is arranged on the peripheral face of the steel pipe in a sleeved mode. The locking nut is arranged on the outer side of the steel pipe in a sleeving mode, internal threads used for being matched with external threads of a steel pipe connector are arranged on the inner circumferential face of the left side of the locking nut, and a limiting structure used for being matched with the forming part of the steel pipe is arranged on the right side of the locking nut. After the limiting structure of the locking nut is clamped into the lining, locking is achieved through matched connection of the locking nut and the steel pipe connector. The strength of the hydraulic system pipeline forming connector can be effectively enhanced, the vibration resistance of the connector is enhanced, the pipeline protection cost is reduced, and maintenance and replacement are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wind driven generator hydraulic system, especially a kind of hydraulic system steel pipe joint connecting structure. BACKGROUND

[0002] Wind driven generator hydraulic system pipeline is the core component of industrial equipment, directly related to equipment life and operating efficiency, pipeline rupture, wear, corrosion or leakage may lead to equipment downtime, safety accidents and high maintenance cost.

[0003] Traditional thinner steel pipe joint adopts sleeve type connection, or steel pipe end integral molding is formed after cooperating with corresponding sealing element and taper surface joint by sleeve nut compression to form 24 ° taper sealing connection, low in strength, easy to fatigue crack, vibration or thermal expansion and contraction is prone to cause steel pipe joint loosening, integral molding subsequent steel pipe joint cannot be replaced alone, once fatigue crack will need to be replaced as a whole, and maintenance cost is high, for slender pipe replacement complex or cannot be replaced, it has brought great equipment safety hazard to engineering operation and maintenance. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the insufficient of prior art, provide a kind of hydraulic system steel pipe joint connecting structure, can effectively enhance the strength of hydraulic system pipeline joint, enhance the vibration resistance of joint, reduce the cost of protection pipeline, it is convenient to repair and replace.

[0005] The utility model can achieve the purpose by adopting the following technical scheme:

[0006] A kind of hydraulic system steel pipe joint connecting structure, including steel pipe joint, lock nut, bushing and steel pipe, the left side of the steel pipe joint is used to connect with hydraulic equipment, its right side is provided with the mounting hole for inserting steel pipe, and the outer circumferential surface of its right side is provided with the external thread for connecting lock nut, the bushing is sleeved on the outer circumferential surface of steel pipe and is located at the right side of the formed part of steel pipe, the lock nut is sleeved on the outer side of steel pipe, the inner thread for cooperating with the external thread of steel pipe joint is arranged on the left side inner circumferential surface of lock nut, the limiting structure for cooperating with the formed part of steel pipe is arranged on the right side of lock nut, lock nut is moved along the axial direction of steel pipe to the direction of steel pipe joint, after the limiting structure of lock nut is clamped into bushing, then locking is realized by the cooperation connection of the internal thread of lock nut and the external thread of steel pipe joint.

[0007] Further, a first inclined surface is arranged at the matching surface of the bushing and lock nut, and the locking of the lock nut, the bushing and the steel pipe is realized by the wedge clamping force of the first inclined surface.

[0008] Further, a second shaft shoulder is arranged at the matching surface of the bushing and lock nut, and the second shaft shoulder is located at the left side of the first inclined surface, and the lock nut is limited by the second shaft shoulder.

[0009] Further, the taper angle of the secondary shoulder is greater than the taper angle of the primary bevel.

[0010] Further, the side surface of the bushing is provided with an opening facilitating replacement.

[0011] Further, the bushing is made of metal, alloy or resin material.

[0012] Further, a sealing ring is sleeved on the steel pipe, and the sealing ring is located between the steel pipe joint and the formed part of the steel pipe.

[0013] Further, a stop structure for limiting the steel pipe is arranged in the mounting hole.

[0014] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0015] 1. The locking nut is used at the steel pipe joint, and the bushing is added, when the locking nut is installed and tightened, the bushing plays a role of fixing and protecting the steel pipe, stress is released to the middle straight section and dispersed, thereby effectively improving the strength of the steel pipe joint, preventing crack propagation, reducing the risk of rupture at the pipe joint, improving the reliability and safety of the hydraulic system, and effectively reducing the risk of loosening of the steel pipe joint caused by vibration or thermal expansion and cold contraction.

[0016] 2. The locking nut is used at the steel pipe joint, and the bushing is added, thereby improving the installation efficiency and reducing the labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic view of the steel pipe joint connecting structure of the utility model.

[0018] Figure 2 It is a sectional view of the steel pipe joint connecting structure of the utility model.

[0019] Figure 3 It is a structural schematic view of the steel pipe joint of the utility model.

[0020] Figure 4 It is a structural schematic view of the locking nut of the utility model.

[0021] Figure 5 It is a structural schematic view of the bushing of the utility model.

[0022] Figure 6 It is a front view of the bushing of the utility model.

[0023] Figure 7 It is a structural schematic view of the steel pipe of the utility model. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0025] like Figures 1 to 7 As shown, this embodiment provides a hydraulic system steel pipe joint connection structure, including a steel pipe joint 1, a locking nut 2, a bushing 3, and a steel pipe 4. The left side of the steel pipe joint 1 is used for connection with hydraulic equipment, and its right side is provided with a mounting hole 101 for inserting the steel pipe 4. A stop structure 102 for limiting the steel pipe 4 is provided in the mounting hole 101. The outer peripheral surface of its right side is provided with an external thread for connecting the locking nut 2. The bushing 3 is sleeved on the outer peripheral surface of the steel pipe 4 and located on the outer edge of the steel pipe 4. On the right side of the forming part 401, the locking nut 2 is fitted onto the outside of the steel pipe 4. The inner circumferential surface on its left side is provided with an internal thread for engaging with the external thread of the steel pipe joint 1. The right side is provided with a limiting structure 201 for engaging with the forming part 401 of the steel pipe 4. The locking nut 2 is moved along the axial direction of the steel pipe 4 toward the steel pipe joint 1, so that the limiting structure 201 of the locking nut 2 is engaged with the bushing 3, and then the locking nut 2 is locked by engaging with the external thread of the steel pipe joint 1 through the internal thread of the locking nut 2.

[0026] A primary inclined surface 301 is provided at the mating surface between the bushing 3 and the locking nut 2. The wedge-shaped clamping force of the primary inclined surface 301 achieves the locking of the locking nut 2 with the bushing 3 and the steel pipe 4. Furthermore, a secondary shoulder 302 is also provided at the mating surface between the bushing 3 and the locking nut 2. The secondary shoulder 302 is located to the left of the primary inclined surface 301, and the cone angle of the secondary shoulder 302 is larger than that of the primary inclined surface 301. The secondary shoulder 302 limits the locking nut 2. The primary inclined surface 301 enhances the contact force between the bushing 3 and the formed part 401 of the steel pipe 4 during the locking process. After the nut is locked in place, it fits tightly against the large-tapered secondary shoulder 302, enhancing the overall sealing performance.

[0027] The bushing 3 has an opening 303 on its side for easy installation and replacement, allowing for regular inspection and replacement of the bushing 3 to prevent breakage of the steel pipe 4. When the locking nut 2 is loosened and removed, the bushing 3 can be opened along the side opening 303 and taken out directly. The new bushing 3 can be inserted in the same way, saving time and effort.

[0028] The bushing 3 mentioned above can be made of metal (such as copper or iron), alloy (such as aluminum alloy or stainless steel) or resin.

[0029] A sealing ring 5 is sleeved on the steel pipe 4 and is located between the steel pipe joint 1 and the formed part 401 of the steel pipe 4.

[0030] The formed part 401 of the steel pipe 4 is weak after deformation and is prone to breakage after vibration, and the length and effective thickness of the bushing 3 can be increased to further improve the deformation resistance of the bushing 3, and the stress concentration position of the formed joint root is transferred and shared to the rear straight section position of the steel pipe 4 under the pre-tightening force of the locking nut 2.

[0031] The installation method of the steel pipe formed joint structure is as follows:

[0032] 1. Directly tighten one end of the steel pipe joint to a certain hydraulic equipment.

[0033] 2. The sealing element is sleeved into the formed part of the formed steel pipe from the left side.

[0034] 3. The locking nut is retreated to the right end of the steel pipe, and then the bushing is sleeved into the steel pipe from the right side after being expanded along the lateral opening, and is pushed to the left side to be attached to the formed part of the steel pipe.

[0035] 4. The steel pipe is inserted into the steel pipe joint together with the sealing element until the end of the steel pipe abuts against the internal stop structure of the steel pipe joint.

[0036] 5. The locking nut is clamped into the bushing and connected and locked with the threads on the steel pipe joint.

[0037] The utility model discloses a one-level inclined plane and two-level shaft shoulder design, in the locking nut thread and steel pipe joint thread spin in the fastening process, one-level inclined plane wedge clamping force, gradually bushing and steel pipe clamping, and with self-locking performance, prevent nut loosening under the vibration environment.

[0038] When the locking nut is further screwed in, the one-level inclined plane has been fastened to a certain extent, and the two-level shaft shoulder plays a limiting role at this time. Since the taper angle of the two-level shaft shoulder is much larger than that of the one-level inclined plane, when the locking nut is rotated to a reasonable torque, the formed part of the steel pipe, the bushing and the seal are all closely attached to and compressed against the steel pipe joint, and the whole pipeline sealing is completed.

[0039] When the steel pipe is regularly maintained, the locking nut is loosened and retreated, the bushing is expanded along the opening thereof and taken out, and a new bushing is replaced, and finally the locking nut is fastened again.

[0040] The above merely describes preferred embodiments of the present utility model patent, but the protection scope of the present utility model patent is not limited thereto, and any person skilled in the art, within the scope disclosed by the present utility model patent, can make equivalent replacements or changes to the technical scheme and the utility model patent concept of the present utility model patent, and all of them belong to the protection scope of the present utility model patent.

Claims

1. A steel pipe joint connection structure for a hydraulic system, characterized in that: The device includes a steel pipe joint, a lock nut, a bushing, and a steel pipe. The left side of the steel pipe joint is used to connect to hydraulic equipment, and the right side is provided with an installation hole for inserting the steel pipe. The outer circumferential surface of the right side is provided with an external thread for connecting the lock nut. The bushing is fitted on the outer circumferential surface of the steel pipe and is located on the right side of the formed part of the steel pipe. The lock nut is fitted on the outer side of the steel pipe. The inner circumferential surface of the left side is provided with an internal thread for engaging with the external thread of the steel pipe joint, and the right side is provided with a limiting structure for engaging with the formed part of the steel pipe. When the lock nut is moved along the axial direction of the steel pipe towards the steel pipe joint, the limiting structure of the lock nut is engaged with the bushing, and then the internal thread of the lock nut engages with the external thread of the steel pipe joint to achieve locking.

2. The hydraulic system steel pipe joint connection structure according to claim 1, characterized in that: The mating surface between the bushing and the locking nut is provided with a first-level inclined surface. The locking nut is locked to the bushing and the steel pipe by the wedge clamping force of the first-level inclined surface.

3. The hydraulic system steel pipe joint connection structure according to claim 2, characterized in that: A secondary shoulder is provided at the mating surface of the bushing and the locking nut. The secondary shoulder is located on the left side of the primary inclined surface and is used to limit the locking nut.

4. The hydraulic system steel pipe joint connection structure according to claim 3, characterized in that: The taper angle of the secondary shoulder is greater than that of the primary slope.

5. The hydraulic system steel pipe joint connection structure according to claim 1, characterized in that: The bushing has an opening on its side for easy installation and replacement.

6. The hydraulic system steel pipe joint connection structure according to claim 1, characterized in that: The bushing is made of metal, alloy or resin.

7. The hydraulic system steel pipe joint connection structure according to claim 1, characterized in that: A sealing ring is fitted onto the steel pipe, and the sealing ring is located between the steel pipe joint and the formed part of the steel pipe.

8. The hydraulic system steel pipe joint connection structure according to claim 1, characterized in that: The mounting hole is equipped with a stop structure for limiting the position of the steel pipe.

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