CN217977816U - Pipeline connecting structure - Google Patents

Abstract

The utility model provides a pipeline connection structure and be equipped with this pipeline connection structure's conveying pipeline relates to the tube coupling technique field. The pipeline connecting structure comprises a pipeline piece, wherein at least one end of the pipeline piece is provided with a reducing section which is matched and connected with a conveying pipe; the variable-diameter section can extend into the conveying pipe, and an installation gap is formed between the variable-diameter section extending into the conveying pipe and the conveying pipe; at least the other part of the reducing section is provided with a drainage channel with the length extending along the first direction, and the drainage channel is communicated with the mounting gap; the first direction is along the axial direction of the pipeline piece or forms an acute angle with the axial direction of the pipeline piece. The utility model provides a pipeline connection structure passes through reducing section and the setting of reducing section upper drainage channel, when satisfying assembly dimensional requirement, ensures that the solder permeates completely, improves welding quality.

Description

Pipeline connecting structure

Technical Field

The application relates to the technical field of pipeline connection, in particular to a pipeline connection structure.

Background

When a pipeline is used for conveying fluid, the pipeline is circuitous, long and the like, and a plurality of pipe fittings are required to be connected with each other.

At present, when pipelines are connected, a garland section needs to be arranged on a pipeline piece to meet the requirement of solder infiltration. However, the connection of the garland section to the delivery pipe often has the following drawbacks: when the garland section completely extends into the conveying pipe, the conveying pipe is in interference fit with the pipeline piece, so that the solder cannot completely penetrate into the conveying pipe, and the welding quality of the conveying pipe and the pipeline piece is influenced; when the section of the garland extends into the delivery pipe too shallowly, although the solder can completely penetrate into the delivery pipe, the garland is exposed too much, and the assembly size and the assembly appearance are influenced.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a piping connection structure that can achieve both of welding quality and fitting size in piping connection.

The utility model provides a pipeline connection structure, includes pipeline spare and conveyer pipe, at least one end of pipeline spare has the reducing section, the part of reducing section is located in the conveyer pipe, be located in the conveyer pipe the part of reducing section with installation clearance has between the conveyer pipe, at least another part is provided with the drainage channel that length extends along first direction on the reducing section, drainage channel with installation clearance intercommunication. The first direction is the axial direction of the pipeline piece or an acute angle formed between the first direction and the axial direction of the pipeline piece.

According to the pipeline connecting structure, the length of the pipeline piece extending into the conveying pipe is controlled through the arrangement of the reducing section, so that the stability of the assembly size is facilitated, and the problem that the assembly size and the assembly appearance are influenced due to the fact that the length of the pipeline piece extending into the conveying pipe is too short is solved; meanwhile, through the arrangement of the drainage channel, the solder can enter the installation gap between the pipeline piece and the conveying pipe along the drainage channel, so that the solder can completely permeate, the welding quality is improved, and the pipeline piece and the conveying pipe are reliably connected.

In one embodiment, the variable diameter section is in a stepped structure; the diameter-changing section comprises a first step section and a second step section connected to the first step section, and the outer diameter of the first step section is larger than that of the second step section; the conveying pipe comprises a flanging hole, the second stepped section is located on the conveying pipe, and at least part of the mounting gap is located between the outer wall of the second stepped section and the inner wall of the flanging hole; the first step section with flanging hole butt, just drainage channel set up at least in first step section.

It can be understood that the reducer section is arranged in a stepped structure, and the processing is simple; and because the clearance between the second step section and the flanging hole is smaller, the welding quality of the pipeline piece and the conveying pipe can be ensured by using less welding flux, and the material and the cost are saved.

In one embodiment, the difference between the outer diameter of the first step section and the outer diameter of the second step section is 1.25% -1.35% of the outer diameter of the second step section; the difference between the outer diameter of the second stepped section and the inner diameter of the flanging hole accounts for 0.97-1.07% of the outer diameter of the second stepped section.

It can be understood that the difference between the outer diameter of the second step section and the outer diameter of the first step section and the inner diameter of the flanging hole is limited, so that the difference between the outer diameter of the first step section and the inner diameter of the flanging hole is smaller, and the solder can flow into the space between the second step section and the flanging hole more smoothly along the drainage channel.

In one embodiment, the reducing section is a tapered structure with an outer diameter gradually reduced from the center to the end along the axial direction of the pipeline piece, part of the tapered structure is located in the delivery pipe, the tapered structure is abutted against the delivery pipe, and part of the drainage channel is located in the delivery pipe.

It can be understood that the reducer section is arranged in a reducing structure, so that the reducer section can extend into the conveying pipe more conveniently; meanwhile, the arrangement increases the installation gap between the reducer section and the conveying pipe, so that more welding materials can permeate into the installation gap, and the welding quality is further enhanced.

In one embodiment, the piping member comprises a body section, the delivery pipe comprises a flanged bore, the tapered structure extends from a distal end of the body section, an outer diameter of the body section is greater than an aperture of the flanged bore, and the aperture of the flanged bore abuts an outer sidewall of the tapered structure.

It can be understood that the outer diameter of the body section is set to be larger than the aperture of the flanging hole, so that part of the drainage channel on the reducing structure is exposed outside, solder can conveniently enter the installation gap through the drainage channel, and the welding quality is ensured.

In one embodiment, the reducer section comprises a tapered section and a straight section connected to the tapered section; the outer diameter of the tapered section is gradually reduced from the center to the end part along the axial direction of the pipeline piece, the straight section is positioned at the extending tail end of the tapered section, and the drainage channel is at least arranged on the tapered section; the straight section is positioned on the conveying pipe; or, the part of the tapered section and the straight section are positioned on the conveying pipe.

It can be understood that the mode that the reducing section is set into the combination of the reducing section and the straight section not only reduces the length of the reducing section exposed outside the conveying pipe, but also utilizes the straight section to reduce the installation gap between the reducing section and the conveying pipe, thereby meeting the welding quality with less welding flux and saving materials and cost.

In one embodiment, the length of the variable-diameter section extending into the conveying pipe is larger than the length of the variable-diameter section exposed outside the conveying pipe.

It can be understood that, by the arrangement, the length of the reducer section exposed outside the conveying pipe is reduced, the problem that the assembly size is influenced by the longer size during installation is solved, and the attractiveness is improved.

In one embodiment, the drainage channel comprises a plurality of grooves distributed at intervals along the circumferential direction of the variable diameter section, and the grooves are formed by inwards recessing from the outer side wall of the variable diameter section along the radial direction of the variable diameter section.

It can be understood that a plurality of grooves which are arranged at intervals are directly machined on the reducing section so as to form a drainage channel, and the structure is simple and the machining is convenient.

In one embodiment, each of the grooves extends linearly, undulates, or extends in a zigzag shape along an axial direction of the variable diameter section.

It is understood that the extending state of the groove is set to control the penetration amount and penetration speed of the solder.

In one embodiment, the depth of the recess radially inward of the groove accounts for 2.5% -25% of the wall thickness of the reducer section, the width of the groove along the circumferential direction of the reducer section accounts for 0.7% -15% of the outer diameter of the reducer section, and the interval between any adjacent grooves is 5-30 degrees.

It can be understood that the size and distribution of the grooves are limited, the reasonable setting of the size of the grooves is facilitated, the phenomenon that the wall thickness of the reducing section is thinned due to too deep depth, so that the breaking is easy to occur, or the drainage effect cannot be achieved due to too shallow depth, or the drainage effect is affected due to too narrow and too wide width, or the solder penetration is affected due to unreasonable distribution of the grooves is avoided as much as possible.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a partial schematic view of a delivery line provided herein.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic diagram of a pipe connection structure provided in the present application in a first scheme.

Fig. 4 is a partially enlarged view of fig. 3 at B.

Fig. 5 is a partial schematic view of a second embodiment of the pipe connection structure provided in the present application.

Fig. 6 is a partial schematic view of a third embodiment of the pipe connection structure provided in the present application.

Reference numerals: 100. a pipeline connecting structure; 101. a mounting gap; 10. a delivery pipe; 11. flanging holes; 20. a pipe fitting; 21. a diameter-changing section; 211. a drainage channel; 212. a groove; 213. a first step section; 214. a second step section; 215. a tapered structure; 216. a tapered section; 217. a straight section; 22. a body section.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

When a pipeline is used for conveying fluid, the pipeline is often circuitous, long and the like, and a plurality of pipe fittings are required to be connected with each other. At present, when a pipeline is connected, a garland section needs to be arranged on a pipeline piece so as to meet the infiltration of welding flux. Because the outer diameter of the garland section is often smaller than the aperture of the flanged hole of the conveying pipe connected with the garland section, the garland section can be completely inserted into the flanged hole, and an interference fit is formed between the non-garland section on the pipeline part and the orifice of the flanged hole. So, when carrying out the welding, the inconvenient orifice infiltration of process flanging hole of solder is between the pore wall of the section of drawing a design and the flanging hole, leads to the flanging hole and the section of drawing a design welding insecure. Or, in order to ensure that the solder can sufficiently penetrate into the flanged hole, a part of the garland section is inserted into the flanged hole, which adversely affects the overall assembly size and the assembly appearance.

To the problem, the utility model provides a pipeline connecting structure to with the turn-ups jogged joint on the conveyer pipe for fluid transport, and can compromise welding quality and assembly size when the two assembles, improved connection reliability and assembly aesthetic property. The piping connection structure is described in detail below.

Referring to fig. 1, 2 and 3, the present application provides a pipe connection structure 100 including a pipe element 20 and a delivery pipe 10, where at least one end of the pipe element 20 has a reducing section 21, a part of the reducing section 21 is located in the delivery pipe 10, an installation gap 101 is formed between the part of the reducing section 21 located in the delivery pipe 10 and the delivery pipe 10, at least another part (i.e., a part not extending into the delivery pipe 10) of the reducing section 21 is provided with a drainage channel 211 having a length extending along a first direction, and the drainage channel 211 is communicated with the installation gap 101. The first direction is along the axial direction of the conduit member 20 or at an acute angle to the axial direction of the conduit member 20. Here, the assembly of the pipe connecting structure 100 and the flanged hole 11 on the side wall of the conveying pipe 10 will be described as an example. At this time, at least a part of the installation gap 101 is located between the hole wall of the burring hole 11 and the outer wall of the tapered section 21 extending into the burring hole 11.

Through the arrangement, when one part of the reducing section 21 is inserted into the flanging hole 11, one section of area with a certain length on the reducing section 21 is always positioned outside the flanging hole 11, so that the insertion depth of the pipeline piece 20 relative to the flanging hole 11 is stably controlled, and the requirements on the assembly size and the assembly appearance are met. At the same time, the interference fit of the line piece 20 itself with the mouth of the flanging hole 11 is improved, precisely because of the control of the insertion depth. At this moment, the arrangement of the drainage channel 211 on the reducing section 21 is matched, so that the solder can be fully drained to the space between the reducing section 21 and the hole wall of the flanging hole 11 through the drainage channel 211, namely the installation gap 101 meets the full penetration of the solder, and the welding quality is improved. Therefore, the length of the variable-diameter section 21 for controlling the pipeline part 20 to extend into the conveying pipe 10 is met, and the stability of the assembly size is facilitated; meanwhile, the solder can enter the installation gap 101 between the pipeline part 20 and the conveying pipe 10 along the drainage channel 211 through the drainage channel 211 on the reducing section 21, so that the solder can completely permeate, and the welding quality is improved.

The pipe fitting 20 and the delivery pipe 10 are metal pipe fittings, which are resistant to high temperature, so that the solder can penetrate and be welded conveniently. In a preferred embodiment, the line member 20 is a copper pipe and the delivery tube 10 is a steel pipe. Wherein, when the conveyer pipe 10 needs to be connected with a plurality of pipeline spare 20, need set up a plurality of flanging hole 11 on conveyer pipe 10, so adopt the steel pipe to ensure that conveyer pipe 10 has higher intensity, and processing is convenient.

It should be noted that the present invention provides various solutions for the structure of the reducer section 21, and each solution is described in detail below.

As shown in fig. 3 and 4, in the first scheme, the reducing section 21 has a stepped structure, and includes a first step 213 and a second step 214 connected to the first step 213, and an outer diameter of the first step 213 is larger than an outer diameter of the second step 214. The second step section 214 is located in the flanging hole 11, and the mounting gap 101 is located between the outer wall of the second step section 214 and the inner wall of the flanging hole 11; the first step 213 abuts against the flanged hole 11, and the drainage channel 211 is at least disposed in the first step 213.

Specifically, through setting reducer section 21 to the stair structure, processing is simple, because second stair section 214 is straight section, and it occupies most space in flanging hole 11 with flanging hole 11 clearance fit, and this makes the clearance of pipeline spare 20 and conveyer pipe 10 less, just can ensure the welding quality of pipeline spare 20 and conveyer pipe 10 with less solder, material saving and cost. Meanwhile, after the second step section 214 extends into the flanged hole 11 of the conveying pipe 10, the end surface of the first step section 213 abuts against the orifice of the flanged hole 11, so that the limitation on the assembly size of the reducer section 21 relative to the conveying pipe 10 is met. The first step 213 is exposed outside the flanging hole 11 to cooperate with the flow guiding channel 211, so as to ensure that the solder can flow into the mounting gap 101 between the outer wall of the second step 214 and the wall of the flanging hole 11 through the flow guiding channel 211. In other embodiments, the first step 213 and the second step 214 are provided with the drainage channels 211 to improve the drainage effect.

Further, the difference between the outer diameter of the first step 213 and the outer diameter of the second step 214 is 1.25% -1.35% of the outer diameter of the second step 214; the difference between the outer diameter of the second step section 214 and the inner diameter of the flanging hole 11 accounts for 0.97-1.07% of the outer diameter of the second step section 214. In this way, by defining the difference between the outer diameter of the second step 214 and the outer diameter of the first step 213 and the inner diameter of the flanged hole 11, the difference between the outer diameter of the first step 213 and the inner diameter of the flanged hole 11 is smaller, so that the solder can flow into the space between the second step 214 and the feeding pipe 10 along the flow guiding channel 211 more smoothly.

In a preferred embodiment, the difference between the outer diameter of the first step 213 and the outer diameter of the second step 214 is 1.25%, 1.29%, 1.33%, or 1.35% of the outer diameter of the second step 214. The difference between the outer diameter of the second step section 214 and the inner diameter of the burring hole 11 is 0.97%, 1.00%, 1.05%, or 1.07% of the outer diameter of the second step section 214.

In a specific embodiment of the first solution, the diameter of the flanging hole 11 is 6.92 ± 0.02mm, the outer diameter of the first step 213 is 6.94 ± 0.02mm, the outer diameter of the second step 214 is 6.85 ± 0.02mm, the second step 214 completely extends into the conveying pipe 10, the mounting gap 101 of 0.03-0.11mm exists between the second step 214 and the flanging hole 11, and the difference between the outer diameter of the first step 213 and the diameter of the flanging hole 11 is 0.02-0.06mm, which is significantly smaller than the size of the flow guiding channel 211, so that the solder can more easily flow into the mounting gap 101.

In the second solution, as shown in fig. 5, the diameter-variable section 21 is a tapered structure 215 with an outer diameter gradually decreasing from the center to the end along the axial direction of the pipeline member 20, and when the diameter-variable section 21 extends into the conveying pipe 10, a part of the drainage channel 211 extends into the flanging hole 11 of the conveying pipe 10.

Specifically, the pipe member 20 further includes a body section 22 connected to the reducer section 21, and the tapered structure 215 extends from the end of the body section 22 of the pipe member 20 along the axial direction of the pipe member 20. Because the external diameter of the main body section 22 is greater than the aperture of the flanged hole 11, when the reducing section 21 extends from the extending end of the main body section 22 in a manner of gradually reducing the diameter, a section of diameter on the reducing structure 215 is always greater than the aperture of the flanged hole 11. Therefore, after the reducing section 21 extends into the conveying pipe 10, a section of the reducing section is exposed out of the flanging hole 11, and the opening of the flanging hole 11 abuts against the outer side wall of the reducing section 21; and, when reducing section 21 stretches into conveyer pipe 10, drainage channel 211 has a part to stretch into in the conveyer pipe 10, is convenient for with the solder drainage to between flanging hole 11 inner wall and the reducing section 21 that stretches into flanging hole 11.

In summary, the diameter of the tapered structure 215 at the end of the tapered structure 215 is smaller than the diameter of the flanged hole 11, so that the tapered structure 21 can conveniently extend into the flanged hole 11 of the conveying pipe 10; meanwhile, the tapered structure 215 also enlarges the installation gap 101 between the tapered section 21 and the hole wall of the flanging hole 11 due to the gradual reduction of the diameter, so that more solder can permeate into the installation gap 101 through the drainage channel 211, and the welding quality is further enhanced.

In a specific embodiment of the second embodiment, the diameter of the body section 22 of the piping component 20 is 7.00 ± 0.02mm, the diameter of the flanged hole 11 is 6.92 ± 0.02mm, the tapered structure 215 is tapered from 7.00 ± 0.02mm to 6.82 ± 0.02mm, a portion of the tapered structure 215 with a diameter greater than 6.92 ± 0.02mm is exposed out of the flanged hole 11, and the orifice of the flanged hole 11 abuts against the outside of the tapered structure 215. In this way, the control of the length of the reducing section 21 exposed outside the flanging hole 11 is satisfied, and the determination of the assembly size is facilitated.

In a third version, as shown in fig. 6, the reducer section 21 comprises a tapered section 216 and a straight section 217 connected to the tapered section 216; the outer diameter of the tapered section 216 gradually decreases from the center to the end along the axial direction of the pipeline member 20, the straight section 217 is located at the extending end of the tapered section 216, the straight section 217 and the tapered section 216 are both provided with the drainage channel 211, or the tapered section 216 is provided with the drainage channel 211; the portion of the tapered section 216 and the flat section 217 are adapted to extend into the flanged aperture of the carrier pipe 10. Specifically, the straight section 217 is arranged to reduce the installation gap between the reducing section 21 and the flanging hole, so that the welding quality of the pipeline component 20 and the conveying pipe 10 can be ensured by using less welding flux, and the material and the cost are saved. Meanwhile, the tapered section 216 extends from the end of the body section 22 of the pipeline member 20, so as to control the length of the reducing section 21 extending into the flanging hole 11. In practical use, as the reducing section 21 extends into the flanging hole 11, the opening of the flanging hole 11 abuts against the outer side wall of the reducing section 216, so as to realize assembly limit.

In other embodiments, the straight section 217 extends into the delivery tube 10. At this point, it may be necessary to manually control the insertion state so that the opening of the flanging hole 11 is exactly flush with the connecting line between the straight section 217 and the tapered section 216. With this arrangement, the gap between the flanged hole 11 at the orifice and the reduced diameter section 21 is increased, so that the solder can completely enter the mounting gap 101, and the penetration rate of the solder is further increased.

In some embodiments, the length of the reducer section 21 extending into the duct 10 is greater than the length of the reducer section 21 exposed outside the duct 10. By the arrangement, the length of the reducing section 21 exposed outside the conveying pipe 10 is limited, the problem that the assembly size is influenced due to long size during installation is solved, and the attractiveness is improved.

As shown in fig. 3 to 6, in some embodiments, the drainage channel 211 includes a plurality of grooves 212 spaced along the circumference of the variable diameter section 21, and the grooves 212 are formed by recessing inward from the outer side wall of the variable diameter section 21 along the radial direction of the variable diameter section 21. That is to say, directly process a plurality of grooves 212 of interval arrangement on reducing section 21 to constitute drainage channel 211, simple structure, processing is convenient.

Generally, the groove 212 is formed by processes such as knurling, laser printing and the like; in a preferred embodiment, the groove 212 is formed by a broaching process, and the processing mode is simple and convenient to operate.

In actual use, the groove 212 extends linearly, undulates, or extends in a zigzag shape along the axial direction of the diameter-variable section 21. By changing the extension state of the groove 212, the control effect on the penetration amount and the penetration speed of the welding flux is realized.

When the groove 212 extends linearly along the axis of the reducing section 21, the solder can be sufficiently entered into the mounting gap 101 to be uniformly distributed between the reducing section 21 and the feed pipe 10. At the same time, the linear extension shortens the time for the solder to enter the mounting gap 101.

When the groove 212 extends in a zigzag shape along the axis of the diameter-variable section 21, more solder can be introduced due to more space provided by the zigzag shape, thereby improving the reliability of soldering.

When the groove 212 extends in a folded wave shape along the axis of the reducing section 21, the wave shape has a certain arc transition at each inflection point, and the flow smoothness of the solder is improved on the basis of increasing the solder filling space.

Further, the depth of the groove 212 accounts for 2.5-25% of the wall thickness of the variable diameter section 21, the width of the groove 212 accounts for 0.9-15% of the outer diameter of the variable diameter section 21, and the interval between any two adjacent grooves 212 is between 5 and 30 degrees. By limiting the size and the distribution of the grooves 212, the reasonable setting of the size of the grooves 212 is facilitated, and the phenomenon that the wall thickness of the reducing section 21 is thinned due to too deep depth to cause fracture easily, or the depth is too shallow to play a role in drainage, or the width is too narrow and too wide to affect the drainage effect, or the unreasonable distribution of the grooves 212 to affect the penetration of solder is avoided as far as possible. Wherein the recess 212 is dimensioned to accommodate the diameter of the line member 20.

In a specific embodiment, the depth of the groove 212 is 2.5%, 12.5% or 25% of the wall thickness of the reducer section 21, the width of the groove 212 is 0.9%, 2.9% or 15% of the outer diameter of the reducer section 21, and the interval between any two adjacent grooves 212 is 5 °, 15 ° or 30 °. As a preferred embodiment, the depth of the groove 212 is 12.5% of the wall thickness of the reducer section 21, the width of the groove 212 is 2.9% of the outer diameter of the reducer section 21, and the groove 212 is spaced 15 ° from the groove 212 in the circumferential direction of the pipe. Due to the arrangement, the depth of the groove 212 can not damage the strength of the wall thickness of the reducing section 21, and solder can be well drained; moreover, the width of the groove 212 is larger than the difference between the outer diameter of the reducing section 21 and the flanging hole 11, so that the solder can enter the mounting gap 101 along the groove 212; meanwhile, the grooves 212 are arranged as many as possible along the circumferential interval angle of the reducing section 21 between the grooves 212, so that the grooves 212 and the grooves 212 are not mutually influenced, and the drainage effect is enhanced.

In the installation operation process, the conveying pipe 10 is arranged at the lower position, the assembly pipe opening of the conveying pipe is upward, the pipeline piece 20 is arranged at the upper position, the assembly pipe opening of the pipeline piece is downward, the reducing section 21 on the pipeline piece 20 extends into the conveying pipe 10, the part of the outer diameter of the reducing section 21, which is larger than the inner diameter of the conveying pipe 10, is exposed outside, the solder enters the installation gap 101 between the reducing section 21 and the conveying pipe 10 through the drainage channel 211 exposed outside, the welding of the reducing section 21 and the conveying pipe 10 is realized, and finally the connection of the conveying pipe is realized.

The utility model provides a pipeline connection structure 100 is connected with conveyer pipe 10 through setting up reducing section 21 on pipeline spare 20, and reducing section 21's setting makes to be fixed with some length on reducing section 21 and exposes in the outside in flanging hole 11, restraint assembly size and assembly outward appearance. Meanwhile, the reducing section 21 is matched with the drainage channel 211, so that the solder can smoothly enter the installation gap between the reducing section 21 and the conveying pipe 10, and the permeability of the solder is improved. Moreover, when the two ends of the pipeline piece are both provided with the reducing sections 21, the pipeline piece is used for being connected with the conveying pipe 10, so that the connecting requirements of the conveying pipeline with longer length and circuitous pipeline are met. Namely: due to the arrangement, the pipeline is more stably connected with the pipeline, the assembly size of the pipeline piece is ensured, and the welding quality and the assembly size in the pipeline connecting process are both considered.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (10)

1. A pipe connecting structure, characterized by comprising:

the pipeline part is provided with a reducing section at least at one end, part of the reducing section is positioned in the conveying pipe, an installation gap is formed between the part of the reducing section positioned in the conveying pipe and the conveying pipe, at least another part of the reducing section is provided with a drainage channel with the length extending along a first direction, and the drainage channel is communicated with the installation gap;

the first direction is the axial direction of the pipeline piece or an acute angle formed between the first direction and the axial direction of the pipeline piece.

2. The pipe connection structure according to claim 1, wherein the reducer section has a stepped structure;

the variable diameter section comprises a first step section and a second step section connected with the first step section, and the outer diameter of the first step section is larger than that of the second step section;

the conveying pipe comprises a flanging hole, the second stepped section is located on the conveying pipe, and at least part of the mounting gap is located between the outer wall of the second stepped section and the inner wall of the flanging hole; the first step section with the flanging hole butt, just drainage channel set up at least in first step section.

3. The pipe connection according to claim 2, wherein the difference between the outer diameter of the first step and the outer diameter of the second step is 1.25-1.35% of the outer diameter of the second step;

the difference between the outer diameter of the second stepped section and the inner diameter of the flanging hole accounts for 0.97-1.07% of the outer diameter of the second stepped section.

4. The piping connection structure according to claim 1, wherein the tapered section is a tapered structure having an outer diameter gradually decreasing from a center to an end in an axial direction of the piping member, a portion of the tapered structure is located in the delivery pipe, the tapered structure abuts against the delivery pipe, and a portion of the drainage channel is located in the delivery pipe.

5. The piping connection structure of claim 4, wherein the piping element comprises a body section, the duct comprises a flanged bore, the tapered structure extends from a distal end of the body section, the body section has an outer diameter greater than a bore diameter of the flanged bore, and the flanged bore orifice abuts an outer sidewall of the tapered structure.

6. The pipe connection structure according to claim 1, wherein the reducer section includes a tapered section and a straight section connected to the tapered section;

the outer diameter of the tapered section is gradually reduced from the center to the end along the axial direction of the pipeline piece, the straight section is located at the extending tail end of the tapered section, and the drainage channel is at least arranged on the tapered section;

the straight section is positioned on the conveying pipe; or, the part of the tapered section and the straight section are positioned on the conveying pipe.

7. The pipe connection structure according to any one of claims 1 to 6, wherein a length of the variable diameter section that protrudes into the delivery pipe is greater than a length of the variable diameter section that is exposed outside the delivery pipe.

8. The piping connection structure according to any one of claims 1 to 6, wherein the drainage channel includes a plurality of grooves spaced apart in a circumferential direction of the variable diameter section, the grooves being formed by being recessed inward from an outer side wall of the variable diameter section in a radial direction of the variable diameter section.

9. The piping connection structure according to claim 8, wherein each of the grooves extends linearly, undulates, or extends in a zigzag shape in an axial direction of the variable diameter section.

10. The pipe connection structure according to claim 9, wherein the recess depth radially inward of the groove is 2.5 to 25% of the wall thickness of the reducer section, the width of the groove in the circumferential direction of the reducer section is 0.9 to 15% of the outer diameter of the reducer section, and the interval between any adjacent grooves is 5 ° to 30 °.

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