A u-tube and straight tube connection mechanism

Abstract

The utility model relates to pipeline connection technical field, specifically disclose a kind of U-shaped pipe and straight pipe connecting mechanism, including U-shaped pipe and straight pipe, the connecting end of U-shaped pipe is fixedly arranged with connecting sleeve and flow guide sleeve, the flow guide sleeve is sleeved in the inside of connecting sleeve, and the inner diameter of flow guide sleeve is consistent with the inner diameter of U-shaped pipe;The connecting end of straight pipe is provided with connector, the end of connector is provided with connecting groove, and the inner wall of connecting groove is provided with internal thread;The outer wall of connecting sleeve is provided with external thread, and the cooperation of external thread and internal thread is achieved;The connecting mechanism is connected by connecting sleeve and connector thread, flow guide sleeve guides fluid, and end face sealing is realized by sealing washer, and fixed flange, movable flange cooperate pull rod and lock nut to enhance stability;It can be applied to heating ventilation air conditioner, hydraulic engineering and other pipeline systems, with the advantages of high sealing reliability, convenient installation, strong adaptability to working conditions and low maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of pipe connection technology, and specifically discloses a U-shaped pipe and straight pipe connection mechanism. Background Technology

[0002] In piping systems for HVAC, water conservancy projects, fluid transport, and heat exchange, the connection between U-shaped pipes and straight pipes must simultaneously meet four core requirements: diameter adaptation, reliable sealing, convenient installation, and operational stability. Existing technologies mostly use threaded connections, flange connections, or welding, but these methods have the following problems:

[0003] Existing reducing connections mostly use spliced ​​reducing pipes, which are prone to leakage at the interface due to residual welding stress, aging of seals, or uneven assembly gaps. At the same time, the flow guiding structure and the sealing structure are independent of each other. When the fluid flows through the reducing section, it is easy to generate eddies due to abrupt changes in the flow channel. This not only increases the flow resistance but may also aggravate the erosion and wear of local seals, further reducing the reliability of the seal.

[0004] Traditional connection methods require specialized tools such as wrenches, and flange connections require multiple alignments of bolt holes, while threaded connections require repeated tightening, making construction in confined spaces extremely difficult. Even after installation, existing bolt tightening is mostly rigid and lacks elastic compensation structures, making it prone to loosening of threads and sealing failure under conditions of pipeline system pressure fluctuations and temperature cycles. In addition, disassembly and maintenance require disassembling bolts or splicing components one by one, which is cumbersome and time-consuming, significantly increasing maintenance costs. Utility Model Content

[0005] This utility model proposes a U-shaped pipe and straight pipe connection mechanism, which achieves initial sealing and fastening through threaded connection, and then uses a movable flange and tie rod nut structure for final locking. It effectively solves the problems of poor sealing, easy loosening and complicated installation of traditional connection methods, and is especially suitable for pipeline systems with high requirements for reliability and convenience.

[0006] This utility model is implemented as follows: a U-shaped tube and a straight tube connection mechanism includes a U-shaped tube and a straight tube. The connecting end of the U-shaped tube is fixedly provided with a connecting sleeve and a flow guide sleeve. The flow guide sleeve is fitted inside the connecting sleeve, and the inner diameter of the flow guide sleeve is the same as the inner diameter of the U-shaped tube. The connecting end of the straight tube is provided with a connector. The end of the connector has a connecting groove, and the inner wall of the connecting groove has an internal thread. The outer wall of the connecting sleeve has an external thread. Through the cooperation of the external thread and the internal thread, the connecting sleeve and the connector are threadedly connected. The flow guide sleeve is inserted into the connector and fits against the inner wall of the connector. A sealing gasket is provided on the end face of the connector for sealing contact with the end face of the U-shaped tube. A fixed flange is fixedly provided on the outer side of the connecting end of the straight tube, and a movable flange is rotatably connected to the outer side of the connecting end of the U-shaped tube. Both the fixed flange and the movable flange have multiple through holes along the circumference. It also includes multiple tie rods, each of which passes sequentially through the corresponding through holes on the fixed flange and the movable flange, and is pressed onto the movable flange by a locking nut.

[0007] As a preferred embodiment of the U-shaped tube and straight tube connection mechanism of this utility model, a transition tube is provided between the connector and the straight tube. The outer diameter of the transition tube gradually increases from the straight tube towards the connector, and the outer diameter of the connector is the same as the outer diameter of the large end of the transition tube.

[0008] In a preferred embodiment of the U-shaped tube and straight tube connection mechanism of this utility model, the sealing gasket is an O-ring made of rubber or silicone.

[0009] In a preferred embodiment of the U-shaped tube and straight tube connection mechanism of this utility model, the guide sleeve and the inner wall of the connector are in clearance fit or transition fit.

[0010] As a preferred embodiment of the U-shaped pipe and straight pipe connection mechanism of this utility model, a bearing is provided between the movable flange and the U-shaped pipe, so that the movable flange can rotate relative to the U-shaped pipe.

[0011] In a preferred embodiment of the U-shaped tube and straight tube connection mechanism of this utility model, the pull rod is a threaded rod, the locking nut is threadedly engaged with the pull rod, and a preload is provided by an elastic washer when the movable flange is tightened. The elastic washer is disposed between the movable flange and the locking nut.

[0012] As a preferred embodiment of the U-shaped tube and straight tube connection mechanism of this utility model, the U-shaped tube, straight tube, connecting sleeve, flow guide sleeve and connector are made of plastic, metal or composite material, and are integrally formed by injection molding or machining.

[0013] The beneficial effects of this utility model are:

[0014] 1. The sealing gasket on the end face of the connector is in close contact with the end face of the U-shaped pipe. The sealing gasket is made of rubber or silicone O-ring, which has good elasticity and excellent sealing performance, effectively preventing fluid leakage. The guide sleeve fits tightly with the inner wall of the connector, and the fit clearance is reasonable. This ensures stable fluid flow within the guide sleeve while further enhancing the sealing effect, reducing the risk of leakage, and overcoming the leakage problems caused by welding stress and aging of seals at traditional spliced ​​reducer interfaces.

[0015] 2. The connecting sleeve and the connecting head are connected by threads to achieve initial quick positioning without complicated positioning operations; the movable flange and the U-tube are connected by bearing rotation, which makes it easy to adjust the position of the through holes on the movable flange and the fixed flange during installation, so that the tie rod can be smoothly inserted. Moreover, most of the installation operations can be completed without special tools, which greatly improves the installation efficiency and solves the problems of difficult construction in narrow spaces and complicated installation steps of traditional connection methods.

[0016] 3. Furthermore, the one-piece molding manufacturing method of the connecting mechanism ensures a stable structure and reduces the risk of leakage caused by splicing gaps; the elastic gasket can provide elastic compensation when the pipeline system experiences pressure fluctuations and temperature cycles, ensuring stable operation of the connecting mechanism under complex working conditions, and is more adaptable than the traditional rigid fixing method.

[0017] 4. During maintenance, simply loosen the locking nut to easily disassemble the tie rod, thereby separating the U-shaped tube from the straight tube. There is no need to disassemble a large number of bolts one by one or disassemble complex splicing parts. The operation is simple, time-saving, and greatly reduces maintenance costs. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This utility model Figure 1 An enlarged structural diagram of point A in the middle.

[0021] Figure 3 This is a schematic diagram of the structure of the U-shaped tube, connecting sleeve, and flow guide sleeve of this utility model.

[0022] Figure 4 This is a schematic diagram of the straight pipe, connector, and transition pipe of this utility model.

[0023] The markings in the diagram are: 1. U-shaped pipe; 2. Straight pipe; 3. Connecting sleeve; 4. Flow guide sleeve; 5. Connecting head; 6. Connecting groove; 7. Sealing gasket; 8. Fixed flange; 9. Movable flange; 10. Through hole; 11. Tie rod; 12. Locking nut; 13. Transition pipe; 15. Bearing; 16. Elastic washer. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0025] Please see Figure 1-4 A U-shaped pipe and straight pipe connection mechanism includes a U-shaped pipe 1 and a straight pipe 2. A connecting sleeve 3 and a flow guide sleeve 4 are fixedly installed at the connecting end of the U-shaped pipe 1. The flow guide sleeve 4 is fitted inside the connecting sleeve 3, and its inner diameter is the same as the inner diameter of the U-shaped pipe 1. A connector 5 is provided at the connecting end of the straight pipe 2. A connecting groove 6 is formed at the end of the connector 5, and the inner wall of the connecting groove 6 has an internal thread. The outer wall of the connecting sleeve 3 has an external thread. Through the cooperation of the external thread and the internal thread, the connecting sleeve 3 and the connector 5 are threadedly connected. The flow guide sleeve 4 is inserted into the connector. The connector 5 is located inside the tube and fits against the inner wall of the connector 5. A sealing gasket 7 is provided on the end face of the connector 5 for sealing contact with the end face of the U-tube 1. A fixed flange 8 is fixedly provided on the outer side of the connecting end of the straight tube 2, and a movable flange 9 is rotatably connected to the outer side of the connecting end of the U-tube 1. Multiple through holes 10 are provided on both the fixed flange 8 and the movable flange 9 along the circumference. Multiple tie rods 11 are also included. Each tie rod 11 passes through the corresponding through holes 10 on the fixed flange 8 and the movable flange 9 in sequence, and is pressed onto the movable flange 9 by a lock nut 12.

[0026] In this embodiment: reliable sealing and quick assembly / disassembly are achieved through the synergistic effect of threaded connection and flange tie rod 11 locking. During installation, firstly, the guide sleeve 4 at the connecting end of U-tube 1 is inserted into the interior of the connector 5 of straight pipe 2 for initial positioning and alignment with the flow channel. At the same time, the external thread on the outer wall of the connecting sleeve 3 engages with the internal thread on the inner wall of the connecting groove 6. Rotating U-tube 1 or straight pipe 2 will initially tighten both through the threaded pair and compress the sealing gasket 7 set on the end face of connector 5, forming the first axial end face seal. Subsequently, the movable flange 9 sleeved on U-tube 1 is rotated so that its circumferential through hole 10 engages with the fixed flange. Align the through holes 10 of the fixed flange 8 on the straight pipe 2, and then pass multiple tie rods 11 through these aligned through holes 10 in sequence. Finally, screw a lock nut 12 on the end of each tie rod 11 and tighten the movable flange 9 by tightening the nut. This tightening force is finally transmitted to the entire connection interface through the movable flange 9, which not only further compacts the sealing gasket 7 and enhances the sealing effect, but also rigidly clamps the fixed flange 8 and the movable flange 9 by the pulling action of the tie rods 11, forming a second insurance against loosening of the threads, thus forming a stable, reliable and excellent sealing pipe connection mechanism.

[0027] As a technical optimization of this utility model, a transition pipe 13 is provided between the connector 5 and the straight pipe 2. The outer diameter of the transition pipe 13 gradually increases from the straight pipe 2 toward the connector 5, and the outer diameter of the connector 5 is the same as the outer diameter of the large end of the transition pipe 13.

[0028] In this embodiment: the transition pipe 13 allows the fluid to transition more smoothly from the straight pipe 2 to the connector 5, reducing the flow resistance and energy loss caused by the sudden change in pipe diameter, which is conducive to the smooth transition of the fluid. In addition, the inner wall taper of the transition pipe 13 is matched with the outer wall taper of the end of the guide sleeve 4, together forming a smooth flow channel transition.

[0029] As a technical optimization of this utility model, the sealing gasket 7 is an O-ring, and the material is rubber or silicone.

[0030] In this embodiment: the rubber or silicone material has good elasticity and sealing performance, which can fit tightly against the end faces of the U-tube 1 and the straight tube 2, effectively preventing fluid leakage and improving the reliability of the seal.

[0031] As a technical optimization of this utility model, the inner wall of the guide sleeve 4 and the connector 5 are in clearance fit or transition fit.

[0032] In this embodiment, the guide sleeve 4 and the inner wall of the connector 5 are fitted with a clearance fit or a transition fit, which ensures that the guide sleeve 4 can be smoothly inserted into the connector 5, and also restricts the radial displacement of the guide sleeve 4 to a certain extent, ensuring that the fluid flows stably in the guide sleeve 4, while facilitating installation and disassembly.

[0033] As a technical optimization of this utility model, a bearing 15 is provided between the movable flange 9 and the U-shaped tube 1, so that the movable flange 9 can rotate relative to the U-shaped tube 1.

[0034] In this embodiment: During installation, it is convenient to adjust the position of the through hole 10 on the movable flange 9 and the fixed flange 8, which facilitates the insertion of the tie rod 11 and greatly improves the installation efficiency; the bearing 15, such as a deep groove ball bearing or a sliding bearing, is installed by interference fit or clearance fit.

[0035] As a technical optimization of this utility model, the pull rod 11 is a threaded rod, and the locking nut 12 is threadedly engaged with the pull rod 11. When the movable flange 9 is pressed, the elastic washer 16 provides the preload force. The elastic washer 16 is disposed between the movable flange 9 and the locking nut 12.

[0036] In this embodiment, the presence of preload ensures that the fixed flange 8 and the movable flange 9 fit tightly together, enhancing the stability of the connection. At the same time, when the pipeline system experiences pressure fluctuations and temperature cycles, the elastic gasket 16 can provide a certain buffering effect, preventing loose threads from causing seal failure.

[0037] As a technical optimization of this utility model, the U-shaped tube 1, straight tube 2, connecting sleeve 3, guide sleeve 4 and connector 5 are made of plastic, metal or composite materials, and are integrally formed by injection molding or machining.

[0038] In this embodiment, the one-piece manufacturing method reduces the gaps between parts, lowers the risk of leakage, and allows for the selection of appropriate materials based on different usage scenarios and working conditions, thus improving the applicability of the connection mechanism.

[0039] Working principle and usage process of this utility model:

[0040] Align the guide sleeve 4 at the connecting end of the U-tube 1 and insert it into the connecting groove 6 of the connector 5 of the straight pipe 2; rotate the U-tube 1 (or the straight pipe 2) so that the external thread of the connecting sleeve 3 engages with the internal thread of the connecting groove 6 until the end face of the connector 5 is pressed tightly against the end face of the U-tube 1 by the sealing washer 7, forming a preliminary seal and fastening; rotate the movable flange 9 on the U-tube 1 so that its through hole 10 is completely aligned with the through hole 10 of the fixed flange 8 on the straight pipe 2; pass multiple tie rods 11 through the aligned through holes 10 of the fixed flange 8 and the movable flange 9 in sequence; put an elastic washer 16 on the end of each tie rod 11 that protrudes from the movable flange 9 and screw in the lock nut 12; use a tool to evenly tighten all the lock nuts 12 until the movable flange 9 is firmly pressed, and the entire connection mechanism reaches the predetermined sealing and locking state.

[0041] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] However, the above are merely specific embodiments of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A U-shaped pipe and straight pipe connection mechanism, comprising a U-shaped pipe (1) and a straight pipe (2), characterized in that: The connecting end of the U-shaped tube (1) is fixedly provided with a connecting sleeve (3) and a flow guide sleeve (4). The flow guide sleeve (4) is fitted inside the connecting sleeve (3), and the inner diameter of the flow guide sleeve (4) is consistent with the inner diameter of the U-shaped tube (1). The connecting end of the straight tube (2) is provided with a connector (5). The end of the connector (5) is provided with a connecting groove (6), and the inner wall of the connecting groove (6) is provided with an internal thread. The outer wall of the connecting sleeve (3) is provided with an external thread. Through the cooperation of the external thread and the internal thread, the connecting sleeve (3) and the connector (5) are threadedly connected. The flow guide sleeve (4) is inserted into the connector (5) and connects with the connector (3). The inner wall of the connector (5) is fitted together; a sealing gasket (7) is provided on the end face of the connector (5) for sealing contact with the end face of the U-tube (1); a fixed flange (8) is fixedly provided on the outside of the connecting end of the straight pipe (2), and a movable flange (9) is rotatably connected on the outside of the connecting end of the U-tube (1). Multiple through holes (10) are provided on both the fixed flange (8) and the movable flange (9) along the circumferential direction; multiple tie rods (11) are also included, each tie rod (11) passing through the corresponding through holes (10) on the fixed flange (8) and the movable flange (9) in sequence, and being pressed onto the movable flange (9) by a locking nut (12).

2. The U-shaped tube and straight tube connection mechanism according to claim 1, characterized in that: A transition pipe (13) is provided between the connector (5) and the straight pipe (2). The outer diameter of the transition pipe (13) gradually increases from the straight pipe (2) toward the connector (5), and the outer diameter of the connector (5) is the same as the outer diameter of the large end of the transition pipe (13).

3. The U-shaped tube and straight tube connection mechanism according to claim 1, characterized in that: The sealing gasket (7) is an O-ring, made of rubber or silicone.

4. The U-shaped tube and straight tube connection mechanism according to claim 1, characterized in that: The guide sleeve (4) and the inner wall of the connector (5) are in a clearance fit or a transition fit.

5. The U-shaped pipe and straight pipe connection mechanism according to claim 1, characterized in that: A bearing (15) is provided between the movable flange (9) and the U-tube (1) so that the movable flange (9) can rotate relative to the U-tube (1).

6. The U-shaped pipe and straight pipe connection mechanism according to claim 1, characterized in that: The pull rod (11) is a threaded rod, and the locking nut (12) is threadedly engaged with the pull rod (11). When the movable flange (9) is pressed, the preload is provided by the elastic washer (16), which is located between the movable flange (9) and the locking nut (12).

7. The U-shaped pipe and straight pipe connection mechanism according to claim 1, characterized in that: The U-shaped tube (1), straight tube (2), connecting sleeve (3), flow guide sleeve (4) and connector (5) are made of plastic, metal or composite material and are integrally formed by injection molding or machining.

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