CN103016863A - Pipe connection structure, hydraulic pipeline - Google Patents

Abstract

The invention discloses a pipeline connection structure, comprising a steel pipe (1), a connection nut (2) clamped on the steel pipe (1), a rubber hose, a jacket (4), a joint core (3), and a matching sleeve (6) . The pipeline connection structure proposed by the present invention, by installing a matching sleeve that can be matched with the diameter of the steel pipe in the joint core, the joint core can be directly connected with steel pipes of different pipe diameters, changing the previous structure that required a transition joint to realize the connection , save the number of parts, reduce the connection points in the overall pipeline, and reduce the occurrence of leakage accidents. By connecting different types of matching sleeves to corresponding types of steel pipes, the types of steel pipes that can be connected to the joint core are expanded, and the types of connection accessories between the steel pipe and the joint core are also reduced, avoiding unnecessary waste of resources caused by too many accessories. And the cumbersome work of selecting accessories during assembly saves assembly time. The invention also discloses a hydraulic pipeline using the pipeline connection structure.

Description

Pipe connection structure, hydraulic pipeline

technical field

The invention relates to the field of hydraulic pipes, in particular to a pipe connection structure and a hydraulic pipe.

Background technique

In the hydraulic pipeline, the diameter of the steel pipe, the shape and connection method of the oil port, the selection of the hose and joint core, the selection of the transition joint, and the selection of the type of connection accessories need to be considered when assembling the hose joint. And each accessory contains multiple models, and the combination and matching of various accessories can complete the overall assembly of the rubber hose joint. Inconvenience in design, production, stocking and storage adds to overall maintenance costs. In addition, in the connection structure of the pipeline, it is usually necessary to use a transition joint to realize the matching and docking of the steel pipe and the joint core. The more connected parts, the more possible leak points, which increases the maintenance and maintenance of the pipeline.

As shown in Figure 1, in the prior art, a transition joint 6' needs to be added in the middle to realize the connection between the steel pipe 1' and the rubber hose, and the connection between the transition joint 6' and the joint core is realized through the connection nut 2', and the sealing ring 7' for sealing. The ferrule 5' socketed on the steel pipe 1' is divided into ultra-light, light and heavy-duty, and there are three kinds of connecting nuts 2' for the steel pipe 1' with the same diameter, which will inevitably cause the transition joint 6' and the hose connection. The connector core 3' also needs three types that can be matched therewith. This will increase the number of parts, which will inevitably increase the difficulty of production, matching and storage, and the assembly efficiency will be low and error-prone.

Contents of the invention

The purpose of the present invention is to provide a pipeline connection structure and a hydraulic pipeline using the pipeline connection structure, so as to improve the disadvantages of various types of joints, cumbersome installation and too many pipeline connection points in actual use.

In order to achieve the above object, the present invention provides a pipeline connection structure, which includes a steel pipe, a connecting nut clamped on the steel pipe, a joint core connected to the steel pipe, and a jacket clamped on the joint core. The structure also includes a matching sleeve, the inner hole of the end where the joint core is connected to the steel pipe is a stepped hole, and the outer circumference is formed with an external thread that engages with the internal thread of the connecting nut, and the matching sleeve is placed on the stepped hole. In the hole, the inner diameter of the matching sleeve is the same as the outer diameter of the steel pipe.

Preferably, a ferrule is fixedly sleeved on the steel pipe, and the connecting nut is engaged with the ferrule.

Preferably, the axial section of the ferrule is wedge-shaped, and the wedge has two tips extending toward both ends of the axial direction. The ferrule of the wedge-shaped cross-section forms two tapered surfaces in the circumferential direction, and the tapered surface on one side is One surface is clamped with the inner hole of the connecting nut, and the tapered surface on the other side is engaged with the port of the matching sleeve.

Preferably, the inner wall of the port of the matching sleeve forms a first tapered opening, and the first tapered opening matches the tapered surface on the other side of the ferrule.

Preferably, a protruding ring is formed by radial expansion near the port of the steel pipe, and the connecting nut is engaged with the protruding ring.

Preferably, the convex ring forms two tapered surfaces in the circumferential direction, the tapered surface on one side of the convex ring engages with the connecting nut, and the tapered surface on the other side engages with the matching sleeve.

Preferably, the inner wall of the port of the matching sleeve forms a second tapered mouth, and the second tapered mouth matches with the tapered surface on the other side of the protruding ring.

Preferably, a gasket is provided between the matching sleeve and the stepped portion of the stepped hole.

Preferably, a groove is formed in the circumferential direction of the hole wall of the stepped hole, and a sealing ring that can fit closely with the matching sleeve is arranged in the groove.

An embodiment of the present invention also proposes a hydraulic pipeline, including the pipeline connection structure described in the above embodiments.

The pipeline connection structure proposed by the present invention, by adding a matching sleeve that can be selected according to the diameter of the steel pipe in the joint core, the joint core can be directly connected with steel pipes of different diameters, changing the previous structure that required a transition joint to realize the connection , saving the number of parts in the installation process, reducing the connection points in the overall pipeline, and reducing the occurrence of leakage accidents. In addition, by connecting different types of matching sleeves to corresponding types of steel pipes, the types of steel pipes that can be connected to the joint core are expanded, and the types of connection accessories between the steel pipe and the joint core are also reduced, avoiding unnecessary resources caused by too many accessories Waste, and the tedious work of selecting accessories during assembly, saves assembly time.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a structural schematic diagram of a steel pipe connected to a joint core through a transition joint in the prior art;

Fig. 2 is a structural schematic diagram of a steel pipe provided by an embodiment of the present invention clamped on a connection nut through a ferrule and connected to a joint core;

Fig. 3 is an exploded schematic view of the connection structure between the steel pipe, the ferrule, the connecting nut, the matching sleeve, the sealing gasket and the joint core provided by the embodiment of the present invention;

Fig. 4 is a structural schematic diagram of a steel pipe provided by an embodiment of the present invention snapped into a connection nut through a convex ring and connected with a joint core;

Fig. 5 is a schematic diagram of a matching sleeve and a sealing ring provided in an embodiment of the present invention to cooperate to realize a sealing structure.

Explanation of reference signs

1' steel pipe 2' connection nut

3'connector core 4'jacket

5' ferrule 6' transition joint

7' sealing ring

1 steel pipe 11 convex ring

2 connection nut 3 joint core

31 step department 4 coats

5 card sets 6 matching sets

61 The first tapered mouth 62 The second tapered mouth

71 sealing gasket 72 sealing ring

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

The pipeline connection structure proposed by the present invention, as shown in Figure 2, includes a steel pipe 1, a connecting nut 2 clamped on the steel pipe 1, a joint core 3 connected to the steel pipe 1, and an outer jacket clamped on the joint core 3 4. The pipeline connection structure also includes a matching sleeve 6. The inner hole at the end where the joint core 3 is connected to the steel pipe is a stepped hole, and an external thread that engages with the internal thread of the connecting nut 2 is formed on the outer periphery. The matching sleeve 6 is placed in the stepped hole Inside, the inner diameter of the matching sleeve 6 is the same as the outer diameter of the steel pipe 1.

A jacket 4 is sheathed on the outside of the connecting end of the connector core 3 and the hose, and the jacket 4 can be pre-fastened on the connector core 3 to form an integral body with the connector core 3 . The rubber hose is not shown in the accompanying drawings of the present invention. The rubber hose should be engaged with the joint core 3 first, and then snap into the outer shell 4. The ribs formed in the circumferential direction of the joint core 3 cooperate with the ribs on the inner peripheral surface of the outer shell 4. Tighten the rubber hose so that the rubber hose will not fall off from the joint core 3. The inner hole at the joint end of the joint core 3 and the steel pipe 1 is set as a stepped hole, as shown in Figure 2 and Figure 3, the matching sleeve 6 can be placed on the stepped portion 31 of the stepped hole. Normally, the outer peripheral surface of the matching sleeve 6 fits the wall of the stepped hole, that is, the outer peripheral diameter of the matching sleeve 6 is the same as the inner diameter of the stepped hole, so that the structure of the steel pipe 1 after being joined with the joint core 3 is stable.

The diameter of the inner circumference of the matching sleeve 6 is the same as the outer diameter of the steel pipe 1, so as to ensure that the steel pipe 1 is connected stably after being inserted into the matching sleeve 6. After the steel pipe 1 is inserted into the matching sleeve 6, the connecting nut 2 and the joint core 3 are threadedly connected, and the connecting nut 2 is tightened to fix the steel pipe 1 to complete the connection of the pipeline. This connection structure omits the transition joint, and also reduces the two connection points in the original connection structure to one connection point. In addition, the specifications of the joint core 3 and the connecting nut 2 remain unchanged, and only the specifications of the matching sleeve 6 are changed to match different steel pipes 1, which reduces the changes of different types of accessories and saves production costs.

In addition, there can be only one specification for the thread of the joint core 3 and the connecting nut 2 to engage. What needs to be changed are steel pipes 1 of different diameters and matching sleeves 6 matched with the steel pipe 1, and the connecting nut 2 only needs to make its own aperture the same as that of the steel pipe 1. The diameter of the outer wall can be matched.

For example: if the joint core 3 with the diameter of the stepped hole is 20mm, five types of steel pipes with outer diameters of φ12mm, φ14mm, φ15mm, φ16mm and 18mm can be connected, and the outer diameter of the designed matching sleeve 6 is φ20mm, and the inner diameter is φ12mm, 14mm, φ15mm, 16mm, φ18mm are matched with the steel pipe 1, the thread design of the joint core 3 is M26×1.5, and the internal threads of the nuts clamped by the five kinds of steel pipe 1 are all M26×1.5, but the hole diameter of the nut and the steel pipe 1 is φ12mm , φ14mm, 15mm, φ16mm, φ18mm five types.

The structure and connection relationship of each component in the connection structure will be further described in detail below.

The connection nut 2 and the steel pipe 1 are in a clamping relationship. After the steel pipe 1 is inserted into the inner hole of the joint core 3, the connection nut 2 is connected to the joint core 3 and the steel pipe 1 is blocked so that the steel pipe 1 cannot be separated from the joint core 3. Therefore, a stable engaging structure is required between the connecting nut 2 and the steel pipe 1 .

In one embodiment of the present invention, the clamping method of the connecting nut 2 and the steel pipe 1 may be: a ferrule 5 is fixedly sleeved on the steel pipe 1, and the connecting nut 2 and the ferrule 5 are clamped.

The ferrule 5 needs to be fixed directly near the end of the steel pipe 1. A structure of the ferrule 5 can be: the axial section of the ferrule 5 is wedge-shaped, and the wedge has two tips extending toward both ends of the axial direction. The wedge-shaped ferrule 5 forms two tapered surfaces in the circumferential direction, one tapered surface engages with the inner hole of the connecting nut 2 , and the other tapered surface engages with the port of the mating sleeve 6 .

The ferrule 5 forms two tapered surfaces in the circumferential direction, which are engaged with the connecting nut 2 and the mating sleeve 6 respectively. The conical surface on one side of the ferrule 5 is clamped with the connecting nut 2, and the connecting nut clamped with it is preferably a structure in which the inner hole matches the conical surface. In this way, during the tightening process of the connecting nut 2, the extruding force can be dispersed to the thicker structure at the bottom of the connecting nut 3, so that the stress intensity at the bottom of the connecting nut is increased.

In addition, in order to make the mating sleeve 6 fit tightly with the ferrule 5, as shown in FIG. The tapered surface on the other side of the ferrule 5 matches. Set the tapered opening of the matching sleeve 6 to an angle matching the tapered surface of the ferrule 5, so that the conical surface of the ferrule 5 can extend into the port of the matching sleeve 6 for a certain distance, so that the ferrule 5 and the matching sleeve 6 The contact area is larger, which can better realize the stability and sealing of the pipeline connection. At the same time, the engagement of the matching sleeve 6 and the ferrule 5 in this structure also plays a role in dispersing the extrusion force, which is the same as the principle of clamping the connecting nut 2 and the ferrule 5 in the above-mentioned embodiment. Usually, ferrule 5 can choose PSR ferrule.

In the above-mentioned embodiments, it is explained that the ferrule 5, the connecting nut 2, and the matching sleeve 6 cooperate to realize the overall connection of the pipeline, wherein the ferrule 5 is externally connected to the steel pipe 1, and the inner peripheral surface of the ferrule 5 has teeth. Can be embedded in the pipe wall of the steel pipe 1 , thus achieving fixation to the steel pipe 1 . In addition to connecting the steel pipe 1, the connecting nut 2, and the matching sleeve 6 through the ferrule 5, a structure is also proposed in one embodiment of the present invention. As shown in Figure 4, at the end of the steel pipe 1 , the radial expansion forms a protruding ring 11 , and the connecting nut 2 is clamped with the protruding ring 11 .

One way of forming the convex ring 11 is to use extrusion molding technology to set molds inside and outside the pipe body of the steel pipe 1 respectively. The inner mold usually uses a steel core, and the diameter of the steel core is the same as the diameter of the inner wall of the steel pipe 1, that is, The inner space of the steel pipe 1 is filled with a steel core. Afterwards, another external mold is socketed on the outer peripheral surface of the steel pipe 1. This external mold is also a tubular structure. A specific space is reserved for the outward expansion of the steel pipe 1 in the middle section of the external mold. This space can make the expanded steel pipe 1 The pipe wall forms a structure conforming to the shape of the space.

When processing the steel pipe 1, press the steel pipe 1 from the two ends of the steel pipe 1 to the middle, and the steel pipe 1 will expand outward at the position reserved by the external mold until it fills the reserved space of the external mold. The shape of the reserved space. So far, the protruding ring 11 of the steel pipe 1 has been processed.

From the point of view of the actual function of the protruding ring 11, it is also the same as the function of the ferrule 5, and it is also for engaging the connecting nut 2 and the matching sleeve 6. Therefore, the structure formed by the protruding ring 11 can also be: the protruding ring 11 is in the surrounding Two conical surfaces are formed upward, the conical surface on one side of the protruding ring 11 engages with the connecting nut 2 , and the conical surface on the other side engages with the mating sleeve 6 .

For the structure of the convex ring 11, the mating sleeve 6 needs to cooperate with it, so the structure formed by the mating sleeve 6 can be: the inner wall of the port of the mating sleeve 6 forms a second tapered mouth 62, and the second tapered mouth 62 is connected with the convex ring 11 in addition. The tapered faces on one side match. The optimal included angle between the conical surface of the second tapered mouth 62 of the mating sleeve 6 and the axial direction is 24°, therefore, the optimal included angle between the conical surface on the other side of the matching protruding ring 11 and the axial direction is also 24°, the structural matching method here is equivalent to the matching method of the matching sleeve 6 and the ferrule 5, and its advantages will not be repeated here.

In addition, the matching sleeve 6 and the steel pipe 1 can also have another joint method, the port of the steel pipe 1 is flared to expand outward to form a bell-shaped structure, and the matching sleeve 6 forms a tapered surface on the outer peripheral surface of the port. Joining with the inner wall of the expanded steel pipe 1, the best included angle between the tapered surface of the matching sleeve 6 and the axial direction after the expansion of the steel pipe 1 is 60°. In this way, the steel pipe 1 wraps the matching sleeve 6 from the outside, changing In addition to the previous jointing method, the airtight joint between the steel pipe 1 and the matching sleeve 6 can also be realized.

Further, in order to improve the airtightness of the pipeline connection, a gasket 71 is provided between the mating sleeve 6 and the stepped portion 31 of the stepped hole. The diameter of the outer edge of the sealing gasket 71 is the same as the diameter of the outer peripheral surface of the mating sleeve 6 . After the steel pipe 1 is inserted into the matching sleeve 6, the connecting nut 2 is threadedly connected with the joint core 3. During the connection process, there will be a certain extrusion force on the gasket 71, causing the gasket 71 to be flattened and deformed, so that the matching sleeve There is no gap between 6 and the gasket 71, and between the gasket 71 and the stepped portion 31, so as to achieve a sealing effect.

As shown in FIG. 2 , the gasket 71 is placed on the stepped portion 31 of the stepped hole. The gasket 71 is as large as the stepped portion 31 . The mating sleeve 6 can be replaced according to actual needs, but the gasket 71 does not need additional replacement.

In addition to the sealing effect achieved by the gasket 71, a sealing ring 72, usually an O-ring, can also be used. As shown in FIG. 5 , in one embodiment of the present invention, a groove is formed on the wall of the stepped hole in the circumferential direction, and a sealing ring 72 that can fit closely with the mating sleeve 6 is arranged in the groove.

Groove circumferentially on the hole wall of the stepped hole, and a sealing ring 72 of suitable size is put into it. The condition that the sealing ring 72 needs to meet is that it can be embedded in the groove, and the diameter of the inner circumference of the sealing ring 72 is slightly smaller than the diameter of the wall of the stepped hole, that is, the sealing ring 72 is stuck in the groove, and a part of it slightly protrudes into the stepped hole. out of the groove. Since the diameter of the outer peripheral surface of the matching sleeve 6 is the same as the diameter of the inner circumference of the stepped hole, the part of the sealing ring 72 protruding slightly out of the groove will contact the matching sleeve 6 and be deformed by the extrusion of the matching sleeve 6, so that the matching sleeve There is no gap between 6 and the sealing ring 72, between the sealing ring 72 and the groove, so as to achieve the effect of sealing.

An embodiment of the present invention also proposes a hydraulic pipeline, including the pipeline connection structure described in the above embodiments.

The pipeline connection structure proposed by the present invention, by adding a matching sleeve that can be selected according to the diameter of the steel pipe in the joint core, the joint core can be directly connected with steel pipes of different diameters, changing the previous structure that required a transition joint to realize the connection , saving the number of parts in the installation process, reducing the connection points in the overall pipeline, and reducing the occurrence of leakage accidents. In addition, by connecting different types of matching sleeves to corresponding types of steel pipes, the types of steel pipes that can be connected to the joint core are expanded, and the types of fittings connected between the steel pipe and the joint core 3 are also reduced, avoiding unnecessary trouble caused by too many fittings. The waste of resources and the tedious work of selecting accessories during assembly save assembly time.

The preferred embodiment of the present invention has been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details of the above embodiment, within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, These simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific implementation manners may be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, various possible combinations are not further described in the present invention.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (10)

1. A pipeline connection structure, including a steel pipe (1), a connecting nut (2) clamped on the steel pipe (1), a joint core (3) connected to the steel pipe (1), and a joint core clamped on the joint core (3) The jacket (4) on the top is characterized in that the pipeline connection structure also includes a matching sleeve (6), the inner hole of the end of the joint core (3) connected to the steel pipe is a stepped hole, and the outer circumference An external thread that engages with the internal thread of the connecting nut (2) is formed on the top, the matching sleeve (6) is placed in the stepped hole, and the inner diameter of the matching sleeve (6) is the same as that of the steel pipe (1) Same outer diameter. 2. The pipeline connection structure according to claim 1, characterized in that a ferrule (5) is fixedly sleeved on the steel pipe (1), and the connecting nut (2) and the ferrule (5) Card access. 3. The pipeline connection structure according to claim 2, characterized in that, the axial section of the ferrule (5) is wedge-shaped, and the wedge-shaped has two tips extending toward both ends of the axial direction, and the wedge-shaped section The ferrule (5) forms two tapered surfaces in the circumferential direction, the tapered surface on one side is engaged with the inner hole of the connecting nut (2), and the tapered surface on the other side is connected to the matching sleeve (6 ) for port engagement. 4. The pipeline connection structure according to claim 3, characterized in that, the inner wall of the port of the matching sleeve (6) forms a first conical opening (61), and the first conical opening (61) is connected to the The tapered face on the other side of the ferrule (5) matches. 5. The pipeline connection structure according to claim 1, characterized in that, near the port of the steel pipe (1), a protruding ring (11) is formed by radial expansion, and the connecting nut (2) and the The protruding ring (11) is clamped. 6. The pipeline connection structure according to claim 5, characterized in that, the convex ring (11) forms two tapered surfaces in the circumferential direction, and the tapered surface on one side of the convex ring (11) is connected to the The nut (2) is clamped, and the tapered surface on the other side engages with the matching sleeve (6). 7. The pipeline connection structure according to claim 6, characterized in that, the inner wall of the port of the matching sleeve (6) forms a second conical opening (62), and the second conical opening (62) is connected to the The tapered face on the other side of the raised ring (11) matches. 8. The pipeline connection structure according to any one of claims 1 to 7, characterized in that a gasket (71) is provided between the matching sleeve (6) and the stepped portion (31) of the stepped hole ). 9. The pipeline connection structure according to any one of claims 1 to 7, characterized in that, a groove is formed in the circumferential direction of the hole wall of the stepped hole, and there is a groove in the groove that can be connected with the Match the sealing ring (72) that the sleeve (6) fits tightly. 10. A hydraulic pipeline, characterized in that it comprises the pipeline connection structure according to any one of claims 1-9.

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