Pipeline connecting device and pipeline system
By arranging a raised structure on the outer periphery of the connecting pipe and cooperating with an adjusting piece, the leakage problem of the ferrule type pipe joint under large tightening torque is solved, high sealing and wide applicability are achieved, and the deformation risk and processing cost are reduced.
Patent Information
- Application Number
- CN202423005726.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-12-05
AI Technical Summary
When a ferrule-type pipe joint is subjected to a large tightening torque, the ferrule and the pipe may deform and leak.
By designing a pipeline connection device with a raised structure on the outer periphery of the connecting pipe, the adjusting part is rotated and an axial force is applied to the joint, so that the step abuts against the end of the connecting pipe to form a sealed fit, reducing the radial force and improving the sealing effect.
It reduces the risk of radial deformation of the pipe, achieves high sealing and multiple reuse, has a wide range of applications, is suitable for different temperature and pressure conditions, and reduces processing difficulty and cost.
Smart Images
Figure CN223344914U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pipeline connection, in particular to a pipeline connection device and a pipeline system. Background Art
[0002] In daily life, various pipelines are used for the circulation of media such as gas, water, steam, and oil. These pipelines involve the connection of the pipeline itself, the medium-using unit, and the branch pipeline, and therefore involve pipeline connection devices to achieve the connection function and sealing function to ensure the reliable circulation of the medium.
[0003] Currently used pipe connection devices are mainly divided into compression fittings, welded fittings, crimping fittings, flared fittings, and clamp fittings. Welded fittings are primarily used in hydraulic systems and are secured by welding, making them suitable for fixed installations. Crimping fittings connect pipes using a crimping process, making them suitable for hose connections and easy to install. Flared fittings use flaring technology to connect pipes and are suitable for applications requiring high sealing performance.
[0004] For the compression sleeve type pipe joint, it is fixed with a ferrule and a nut, which is suitable for connecting pipes of various materials and is easy to operate. The principle of the compression sleeve type pipe joint is to drive the axial movement of the clamping mechanism through the thread mechanism to compress the ferrule to generate radial force and fit the pipeline to form a sealing function.
[0005] However, when a ferrule-type pipe fitting is subjected to a large tightening torque, the ferrule and the connecting pipe will be deformed and leak. The specific reason is that when a ferrule-type pipe fitting is subjected to a large tightening torque, the ferrule will be subjected to a large pressure and generate excessive radial force, causing the ferrule itself and the connecting pipe to deform radially and leak.
[0006] Therefore, a new type of pipe connection device is urgently needed to solve the problem that when a ferrule-type pipe joint is subjected to a large tightening torque, the ferrule and the pipe are deformed and leaks occur. Utility Model Content
[0007] The main purpose of the utility model is to provide a pipeline connection device and a pipeline system, which aims to solve the problem that when a ferrule-type pipe joint is subjected to a large tightening torque, the ferrule and the pipe are deformed and leaks occur.
[0008] To achieve the above-mentioned purpose, the pipeline connection device proposed by the present invention includes a connecting pipe, a joint and an adjusting piece, and the outer periphery of the connecting pipe is provided with a protruding structure; the joint is provided with a stepped hole, the stepped hole has a first hole section, a step and a second hole section connected in sequence, the first hole section is provided with an internal thread, and the first hole section is sleeved on the outer periphery of the connecting pipe and the protruding structure; the step is located on one side of the protruding structure in the axial direction; the adjusting piece is provided with a through hole, the through hole is sleeved on the outer periphery of the connecting pipe, and the adjusting piece is located on the other side of the protruding structure in the axial direction; the adjusting piece is provided with a first external thread, and the first external thread is matched with the internal thread; the adjusting piece is used to be rotated to press against the other side of the protruding structure in the axial direction and apply an axial force to the joint so that the step abuts against the end of the connecting pipe and forms a sealed fit.
[0009] In one embodiment, the step is provided with a conical recess, the end of the connecting pipe is provided with a conical fitting surface, and the conical recess abuts against the conical fitting surface; and / or the aperture of the second hole section is smaller than the aperture of the first hole section.
[0010] In one embodiment, the protrusion structure is configured as an annular protrusion, and the annular protrusion is coaxially disposed with the connecting pipe.
[0011] In one embodiment, a second external thread is provided on the outer periphery of the connecting pipe, and the annular protrusion is configured as an adjusting nut, which is threadably connected to the second external thread.
[0012] In one embodiment, the first external thread and the internal thread have the same rotation direction, and the second external thread and the thread of the adjusting nut have the same rotation direction; the first external thread and the second external thread have opposite rotation directions.
[0013] In one embodiment, the first external thread and the internal thread are both left-handed threads, and the second external thread and the thread of the adjusting nut are both right-handed threads; and / or, the first external thread and the internal thread are both right-handed threads, and the second external thread and the thread of the adjusting nut are both left-handed threads.
[0014] In one embodiment, the axial length of the thread segment of the second external thread is greater than the thickness of the adjusting nut.
[0015] In one embodiment, the first external thread is provided at one end of the adjusting member in the axial direction; the other end of the adjusting member in the axial direction is provided with a flat portion; or the other end of the adjusting member in the axial direction is provided with an external hexagonal structure.
[0016] In one embodiment, the outer periphery of the joint is provided with flat portions; or, the outer periphery of the joint is configured as an outer hexagonal structure.
[0017] The utility model also provides a pipeline system, including the above-mentioned pipeline connecting device.
[0018] The technical solution of the utility model adopts a pipeline connection device including a connecting pipe, a joint and an adjusting piece, and the outer periphery of the connecting pipe is provided with a protruding structure; the joint is provided with a stepped hole, the stepped hole has a first hole section, a step and a second hole section connected in sequence, the first hole section is provided with an internal thread, and the first hole section is sleeved on the outer periphery of the connecting pipe and the protruding structure; the step is located on one side of the protruding structure along the axial direction; the adjusting piece is provided with a through hole, the through hole is sleeved on the outer periphery of the connecting pipe, and the adjusting piece is located on the other side of the protruding structure along the axial direction; the adjusting piece is provided with a first external thread, and the first external thread is matched with the internal thread; the adjusting piece is used to be rotated to press the other side of the protruding structure along the axial direction and apply an axial force to the joint so that the step abuts against the end of the connecting pipe and forms a sealing fit.
[0019] The technical solution of the present invention is to cooperate with the adjusting part, the joint and the protruding structure, and to rotate the adjusting part to the other side of the protruding structure in the axial direction and apply an axial force to the joint so that the step approaches the end of the connecting pipe, so that the step abuts and is in close contact with the end of the connecting pipe, forming a sealing fit and achieving a rigid sealing effect.
[0020] Compared to the scheme of the ferrule-type joint that uses a threaded mechanism to drive the clamping mechanism to compress the ferrule, causing the ferrule to generate radial force and fit the pipeline to form a seal, the present invention applies an axial force to the joint by rotating the adjusting member, thereby achieving a sealing effect between the step and the end of the pipe. Since the main body of the sealing force in this process is applied axially to the pipe, the radial force on the outer wall of the pipe is reduced, thereby reducing the risk of radial deformation of the pipe, thereby avoiding leakage. In addition, the pipe has a strong axial load capacity and can withstand greater axial sealing force. Therefore, the present pipe connection device can apply a greater axial sealing force to the joint and pipe by rotating the adjusting member, thereby meeting high sealing requirements. In addition, since the present pipe connection device is not easily deformed, it can be reused many times, with good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0022] Figure 1 A cross-sectional schematic diagram of an embodiment of a pipe connection device provided by the present utility model;
[0023] Figure 2 This is a structural schematic diagram of another embodiment of the pipeline connecting device provided by the utility model.
[0024] Description of Figure Numbers:
[0025] 1. Connecting pipe; 11. Protruding structure; 2. Connector; 21. First hole section; 22. Step; 23. Second hole section; 3. Adjusting piece.
[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0030] In daily life, various pipelines are used for the circulation of media such as gas, water, steam, and oil. These pipelines involve the connection of the pipeline itself, the medium-using unit, and the branch pipeline, and therefore involve pipeline connection devices to achieve the connection function and sealing function to ensure the reliable circulation of the medium.
[0031] Currently used pipe connection devices are mainly divided into compression fittings, welded fittings, crimping fittings, flared fittings, and clamp fittings. Welded fittings are primarily used in hydraulic systems and are secured by welding, making them suitable for fixed installations. Crimping fittings connect pipes using a crimping process, making them suitable for hose connections and easy to install. Flared fittings use flaring technology to connect pipes and are suitable for applications requiring high sealing performance.
[0032] For the compression sleeve type pipe joint, it is fixed with a ferrule and a nut, which is suitable for connecting pipes of various materials and is easy to operate. The principle of the compression sleeve type pipe joint is to drive the axial movement of the clamping mechanism through the thread mechanism to compress the ferrule to generate radial force and fit the pipeline to form a sealing function.
[0033] However, when a ferrule-type pipe fitting is subjected to a large tightening torque, the ferrule and the connecting pipe will be deformed and leak. The specific reason is that when a ferrule-type pipe fitting is subjected to a large tightening torque, the ferrule will be subjected to a large pressure and generate excessive radial force, causing the ferrule itself and the connecting pipe to deform radially and leak.
[0034] Therefore, a new type of pipe connection device is urgently needed to solve the problem that when a ferrule-type pipe joint is subjected to a large tightening torque, the ferrule and the pipe are deformed and leaks occur.
[0035] Based on this, the utility model proposes a pipeline connecting device.
[0036] See also Figure 1 and 2 In one embodiment of the utility model, the pipeline connection device includes a connecting pipe 1, a joint 2 and an adjusting member 3. The outer periphery of the connecting pipe 1 is provided with a protruding structure 11; the joint 2 is provided with a stepped hole, the stepped hole has a first hole section 21, a step 22 and a second hole section 23 connected in sequence, the first hole section 21 is provided with an internal thread, and the first hole section 21 is sleeved on the outer periphery of the connecting pipe 1 and the protruding structure 11; the step 22 is located on one side of the protruding structure 11 along the axial direction; the adjusting member 3 is provided with a through hole, which is sleeved on the outer periphery of the connecting pipe 1, and the adjusting member 3 is located on the other side of the protruding structure 11 along the axial direction; the adjusting member 3 is provided with a first external thread, and the first external thread is matched with the internal thread; the adjusting member 3 is used to be rotated to press against the other side of the protruding structure 11 in the axial direction and apply an axial force to the joint 2, so that the step 22 abuts against the end of the connecting pipe 1 and forms a sealing fit.
[0037] It should be noted that the connecting pipe 1 can be used to transport media such as gas, water, steam, and oil. One end of the connecting pipe 1 is designed to abut against the step 22 to form a seal, while the other end of the connecting pipe 1 can be used to connect to other pipelines, such as a butt weld. The connector 2 has a first hole section 21, a step 22, and a second hole section 23. The first hole section 21 is threadedly connected to the adjusting member 3, while the second hole section 23 can be used to connect to other pipelines, such as a butt weld to connect to other pipelines.
[0038] When using this pipe connection device, first put the adjusting member 3 on the pipe 1. At this time, the adjusting member 3 is a movable part that can rotate and move axially. Then put the connector 2 on the pipe 1 and the outer periphery of the protruding structure 11. At this time, the connector 2 is also a movable part that can rotate and move axially. Of course, the assembly order of the adjusting member 3 and the connector 2 on the pipe 1 can also be reversed, and this is not limited here. When putting it on, it is necessary to pay attention to setting the second hole section 23 of the adjusting member 3 and the connector 2 on both sides of the protruding structure 11 respectively. After the putting is completed, the first external thread of the adjusting member 3 is connected with the internal thread of the first hole section 21. Please refer to Figure 1 After rotating the adjusting member 3 to the position shown in the figure, the adjusting member 3 is in close contact with the raised structure 11, and the connector 2 is in close contact with the end of the connecting pipe 1 under the threaded locking action of the adjusting member 3 and forms a sealed fit; at this time, the connecting pipe 1, the connector 2 and the adjusting member 3 form a whole, and the connector 2 cannot rotate at this time, but can move axially with the pipeline system where the connecting pipe 1 is located, and the entire pipeline connection device is assembled.
[0039] The technical solution of the present invention is to cooperate with the adjusting member 3, the joint 2, and the protruding structure 11. By rotating the adjusting member 3 to press against the other side of the protruding structure 11 in the axial direction and applying an axial force to the joint 2, the step 22 is moved closer to the end of the connecting pipe 1, so that the step 22 abuts and is in close contact with the end of the connecting pipe 1, forming a sealed fit, which not only enables rapid connection of the pipeline, but also enables effective sealing; the adjusting member 3 and the joint 2 can be quickly connected and disassembled, which is convenient for use and subsequent maintenance and replacement; in addition, the pipeline connection device also has the advantages of small size and light weight.
[0040] Compared to the scheme of the ferrule-type joint 2 that uses a threaded mechanism to drive a clamping mechanism to compress the ferrule, causing the ferrule to generate radial force and fit the pipe to form a seal, the present invention applies an axial force to the joint 2 by rotating the adjusting member 3, thereby achieving a sealing effect between the step 22 and the end of the pipe 1. Since the main body of the sealing force in this process is applied axially to the pipe 1, the radial force on the outer wall of the pipe 1 is reduced, thereby reducing the risk of radial deformation of the pipe 1 and thus avoiding leakage. In addition, the pipe 1 has a strong axial load capacity and can withstand a greater axial sealing force. Therefore, the present pipe connection device can apply a greater axial sealing force to the joint 2 and the pipe 1 by rotating the adjusting member 3, thereby meeting high sealing requirements. Since the present pipe connection device is not easily deformed, it can be reused many times and has good economic benefits.
[0041] In addition, in order to achieve a better sealing effect, the traditional compression sleeve pipe joint 2 usually has high requirements on the outer diameter roughness and dimensional accuracy of the connecting pipe 1, which leads to higher requirements on processing accuracy and higher costs. However, the pipeline connection device of the present invention adopts the end of the connecting pipe 1 to abut against the step 22 of the joint 2 to form a sealing fit, so it is only necessary to ensure the roughness and dimensional accuracy of the end of the connecting pipe 1 and the step 22, thereby reducing the processing difficulty.
[0042] In addition, the conventional ferrule-type pipe joint 2 has a limited scope of application and is difficult to take into account working conditions such as normal temperature, high temperature, high pressure, and low pressure. It is also not suitable for high-temperature high-pressure media and low-temperature high-pressure media, and the temperature range of the applicable medium is -20°C to 100°C. However, for the pipe connection device of the present invention, by selecting the materials of each component in the pipe connection device according to different usage requirements, the pipe connection device can have a wider applicable pressure range and applicable temperature range. Not only is the sealing effect good under high-pressure and low-pressure working conditions, the applicable pressure range can be from vacuum to 100MPa, but it is also suitable for low temperature, normal temperature, and high temperature temperature ranges, the applicable temperature range can be from -196°C to 600°C, and it is also suitable for comprehensive temperature and pressure conditions such as high-temperature high pressure, low-temperature high pressure, normal temperature high pressure, and normal temperature low pressure. In addition, by targeted design of the dimensions of each component in the pipe connection device, it can meet the requirements of pipelines from DN5 to DN500 and is suitable for pipelines of different diameters, especially larger diameter pipelines.
[0043] In order to solve the problem of how to improve the sealing level between the step 22 and the pipe 1, in the embodiment of the present utility model, please refer to Figure 1 The step 22 is provided with a conical recess, the end of the pipe 1 is provided with a conical mating surface, and the conical recess abuts against the conical mating surface; and / or the aperture of the second hole segment 23 is smaller than the aperture of the first hole segment 21. The conical recess can be provided on the step 22 in a radial direction close to the axis of the second hole segment 23.
[0044] In this embodiment, by allowing the conical recess to abut against the conical mating surface, the conical recess and the conical mating surface form a conical rigid sealing pair. This utilizes the conical surface to increase the sealing pressure ratio, improve the sealing level, and ensure both sealing and connection capabilities. Furthermore, tightening the adjustment member 3 can increase the sealing degree of the conical rigid sealing pair. Combined with the increased sealing pressure ratio brought about by the conical sealing pair, this makes it suitable for applications requiring high sealing performance. Furthermore, as an optional embodiment, the taper of the conical recess matches the taper of the conical mating surface; thus, when the conical recess abuts against the conical mating surface, the surface of the conical recess better fits the conical mating surface, forming a sealing fit with a better sealing effect.
[0045] In order to solve the problem that the protruding structure 11 is easily damaged due to excessive and concentrated axial stress, in the embodiment of the present utility model, please refer to Figure 1 The protruding structure 11 is configured as an annular protrusion, which is coaxially arranged with the connecting pipe 1. By configuring the protruding structure 11 as an annular protrusion, the force-bearing area of the protruding structure 11 subjected to the axial force is increased, and the stress is evenly distributed, thereby reducing the local extrusion stress of the annular protrusion after the adjusting member 3 is tightened, thereby avoiding stress concentration and damage to the protruding structure 11 caused by excessive local stress.
[0046] In order to solve the problem of inconvenience in maintenance and replacement of damaged annular protrusions, in the embodiment of the present utility model, please refer to Figure 1 , the outer periphery of the connecting pipe 1 is provided with a second external thread, and the annular protrusion is set as an adjusting nut, and the adjusting nut is threadedly connected to the second external thread. In this way, the adjusting nut can be disassembled for easy maintenance and replacement. In addition, the adjusting nut can be adjusted to a fixed position along the second external thread, which is convenient for assembly of the connector 2, the adjusting part 3 and the adjusting nut. At this time, when using the present pipeline connection device, it is necessary to first put the adjusting nut on the connecting pipe 1 and thread the adjusting nut to the second external thread; after rotating the adjusting nut to a predetermined position on the second external thread, the adjusting nut and the connecting pipe 1 form a whole, and the adjusting nut serves as a fixed base point near the end of the connecting pipe 1 to maintain a relative position unchanged, thereby providing fixation for the subsequent assembly of the adjusting part 3 and the connector 2. The subsequent method of assembling the adjusting part 3 and the connector 2 to the connecting pipe 1 is similar to the above embodiment and will not be repeated here.
[0047] In order to solve the problem that when the adjusting member 3 is tightened, the extrusion force and friction force exerted by the adjusting member 3 on the adjusting nut causes the adjusting nut to rotate, in an embodiment of the present invention, the first external thread and the internal thread have the same rotation direction, and the second external thread and the thread of the adjusting nut have the same rotation direction; the first external thread and the second external thread have opposite rotation directions.
[0048] In this way, by making the rotation direction of the first external thread and the second external thread opposite, when the adjusting member 3 is tightened, the squeezing force of the adjusting member 3 on the adjusting nut will cause the adjusting nut to have a forward movement tendency, and the friction force of the adjusting member 3 on the adjusting nut will cause the adjusting nut to have a rotation tendency in the same direction as the rotation direction of the adjusting member 3. Since the rotation direction of the adjusting member 3 is opposite to that of the adjusting nut, the two movement tendencies of the adjusting nut when subjected to the squeezing force and friction force applied by the adjusting member 3 are offset, so that the adjusting nut becomes self-locking, and the adjusting nut is prevented from rotating with the adjusting member 3.
[0049] Specifically, as an optional embodiment, the first external thread and the internal thread are both left-handed, while the second external thread and the thread of the adjusting nut are both right-handed. Thus, the first external thread of the adjusting member 3 is left-handed, while the thread of the adjusting nut is right-handed. When the adjusting member 3 rotates counterclockwise and presses against the adjusting nut, a counterclockwise force is applied to the adjusting nut, which requires clockwise rotation to move along the thread. Therefore, this optional configuration allows the adjusting nut to self-lock when pressed by the adjusting member 3.
[0050] As another optional embodiment, the first external thread and the internal thread are both right-hand threads, while the second external thread and the thread of the adjusting nut are both left-hand threads. Thus, the first external thread of the adjusting member 3 is right-hand, while the thread of the adjusting nut is left-hand. When the adjusting member 3 is rotated clockwise and presses against the adjusting nut, a right-hand force is applied to the adjusting nut, while the adjusting nut needs to be rotated counterclockwise to move along the thread. Therefore, this optional configuration allows the adjusting nut to self-lock when pressed by the adjusting member 3.
[0051] In order to solve the problem that the thread fitting stroke of the adjusting nut on the second external thread is small, resulting in a relatively limited position of the adjusting nut, in an embodiment of the present utility model, the axial length of the thread section of the second external thread is greater than the thickness of the adjusting nut.
[0052] In this embodiment, by ensuring that the threaded section of the second external thread is longer than the thickness of the adjusting nut, the adjusting nut has a sufficient fit range on the second external thread. This allows the adjusting nut to freely rest in more positions on the second external thread, thereby improving adjustment flexibility and adaptability. Furthermore, because the adjusting nut moves within a certain range and forms a self-locking mechanism, even if the sealing area is damaged, the adjusting nut can be rotated to maintain a normal installation gap, making the pipe connection device relatively maintainable.
[0053] In order to solve the problem of inconvenience in tightening the adjusting member 3, in the embodiment of the present utility model, please refer to Figure 1 and 2, a first external thread is provided at one axial end of the adjusting member 3; a flat portion is provided at the other axial end of the adjusting member 3; or, an external hexagonal structure is provided at the other axial end of the adjusting member 3. In this manner, the flat portion or external hexagonal structure provided at the other axial end of the adjusting member 3 provides a clamping force point, facilitating tightening using a wrench or other clamping tool. For ease of understanding, the adjusting member 3 can be considered an adjusting nut, with a first external thread provided on the outer surface of one end and a flat portion or external hexagonal structure provided at the other end.
[0054] In order to solve the problem of inconvenient clamping operation of the connector 2, in the embodiment of the present utility model, please refer to Figure 1 and 2 Alternatively, the outer periphery of the joint 2 may be provided with a flat portion; or the outer periphery of the joint 2 may be provided with an external hexagonal structure. Thus, the flat portion or external hexagonal structure provided on the outer periphery of the joint 2 can provide a clamping force point, making it easier for the operator to tighten the joint using a wrench or other clamping tool.
[0055] The present invention also proposes a pipeline system, which includes a pipeline connecting device. The specific structure of the pipeline connecting device refers to the above-mentioned embodiment. Since this pipeline system adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.
[0056] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A pipe connection device, characterized in that: include: A connecting pipe, wherein the outer periphery of the connecting pipe is provided with a convex structure; A joint, wherein the joint is provided with a stepped hole, the stepped hole having a first hole section, a step, and a second hole section connected in sequence, the first hole section being provided with an internal thread and being sleeved on the outer circumference of the connecting pipe and the protruding structure; the step being located on one side of the protruding structure in the axial direction; An adjusting piece, wherein the adjusting piece is provided with a through hole, the through hole is sleeved on the outer circumference of the connecting pipe, and the adjusting piece is located on the other side of the protruding structure in the axial direction; the adjusting piece is provided with a first external thread, and the first external thread is connected with the internal thread in a mating manner; the adjusting piece is used to be rotated to press against the other side of the protruding structure in the axial direction and apply an axial force to the joint, so that the step abuts against the end of the connecting pipe and forms a sealed fit.
2. The pipe connection device according to claim 1, characterized in that: The step is provided with a conical recessed portion, the end portion of the pipe is provided with a conical matching surface, and the conical recessed portion abuts against the conical matching surface; And / or, the aperture of the second hole segment is smaller than the aperture of the first hole segment.
3. The pipe connection device according to claim 2, characterized in that: The protrusion structure is configured as an annular protrusion, and the annular protrusion is coaxially arranged with the connecting pipe.
4. The pipe connection device according to claim 3, characterized in that: The outer circumference of the connecting pipe is provided with a second external thread, the annular protrusion is configured as an adjusting nut, and the adjusting nut is threadably connected to the second external thread.
5. The pipe connection device according to claim 4, characterized in that: The first external thread has the same rotation direction as the internal thread, and the second external thread has the same rotation direction as the thread of the adjusting nut; the first external thread and the second external thread have opposite rotation directions.
6. The pipe connection device according to claim 5, characterized in that: The first external thread and the internal thread are both left-hand threads, and the second external thread and the thread of the adjusting nut are both right-hand threads; Alternatively, the first external thread and the internal thread are both right-hand threads, and the second external thread and the thread of the adjusting nut are both left-hand threads.
7. The pipe connection device according to claim 4, characterized in that: The axial length of the thread segment of the second external thread is greater than the thickness of the adjusting nut.
8. The pipe connection device according to any one of claims 1 to 7, characterized in that: The first external thread is provided at one end of the adjusting member in the axial direction; The other end of the adjusting member along the axial direction is provided with a flat portion; or the other end of the adjusting member along the axial direction is provided with an outer hexagonal structure.
9. The pipe connection device according to claim 8, characterized in that: The outer periphery of the joint is provided with a flat portion; or the outer periphery of the joint is arranged as an outer hexagonal structure.
10. A piping system, characterized in that: The invention comprises the pipeline connecting device according to any one of claims 1 to 9.