Straight pipe type steel-plastic adapter

Abstract

The utility model discloses a straight pipe type steel-plastic conversion joint, which comprises a straight pipe, joints are welded at two ends of the straight pipe, each joint comprises a shell, a cavity, external threads and internal threads, the shell is welded at the end part of the straight pipe, the external threads are arranged on the outer side of the shell, the number of the external threads is multiple, and the internal threads are arranged in the cavity. The diameter of the multiple external threads is sequentially increased from the end, away from the straight pipe, of the shell to the other end of the shell, a cavity is formed in the shell and communicates with the straight pipe, multiple internal threads are formed in the inner wall of the cavity, and the diameter of the multiple internal threads is sequentially decreased from the end, away from the straight pipe, of the shell to the other end of the shell. By means of the connector composed of the shell, the cavity, the external threads and the internal threads, when the connector is applied to adapting of two steel-plastic pipes, adapting of the two steel-plastic pipes with different diameters is facilitated by connecting the pipeline with the proper external threads or the proper internal threads, impact of the water hammer effect is facilitated to be weakened through the multiple circular-truncated-cone-shaped flow slowing pipes, and the service life of the connector is prolonged. And the phenomenon that the valve is damaged due to overlarge impact force is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of conversion joints, and in particular relates to a straight pipe type steel-plastic conversion joint. Background Art

[0002] Steel-plastic pipe refers to plastic-coated steel pipe, which is a product that uses PE (modified polyethylene) for hot-dip plastic or EP (epoxy resin) for internal and external coating, and has excellent corrosion resistance. At the same time, the coating itself also has good electrical insulation and will not produce electrical corrosion. It has low water absorption, high mechanical strength, and low friction coefficient, and can achieve the purpose of long-term use. It is suitable for the transportation of drainage, seawater, oil, gas and other media. The existing steel-plastic pipe conversion joint and steel-plastic pipe connection methods mainly use threads, grooves, flanges and welding.

[0003] However, when the existing straight pipe steel-plastic conversion joint is used to convert two steel-plastic pipes, the conversion joint can only adapt to the fixed diameter of the steel-plastic pipe, which is inconvenient to convert two steel-plastic pipes with different diameters. In addition, when the steel-plastic pipe is used to transport water, the conversion joint cannot reduce the water hammer effect, resulting in the impact of water flow, which will pass through the conversion joint and flow back along the steel-plastic straight pipe, causing damage to the valve. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a straight pipe type steel-plastic conversion joint.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A straight pipe steel-plastic conversion joint comprises a straight pipe, both ends of which are welded with joints, the joint comprising a shell, a cavity, an external thread and an internal thread, the end of the straight pipe is welded with a shell, the outer side of the shell is provided with an external thread, the number of the external threads is multiple, and the diameters of the multiple external threads increase successively from the end of the shell away from the straight pipe to the other end, a cavity is provided in the shell, the cavity is connected to the straight pipe, the inner wall of the cavity is provided with an internal thread, the number of the internal threads is multiple, and the diameters of the multiple internal threads decrease successively from the end of the shell away from the straight pipe to the other end, a slow flow tube is fixedly connected in the straight pipe, the slow flow tube is truncated, and the diameter of the slow flow tube inner cavity from one end to the other end gradually decreases.

[0007] Furthermore, there are multiple slow-flow tubes, and the multiple slow-flow tubes are arranged at equal intervals.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] 1. The joint composed of a shell, a cavity, an external thread and an internal thread is used to transfer two steel-plastic pipes. When the pipes are connected with a suitable external thread or a suitable internal thread, it is convenient to transfer two steel-plastic pipes with different diameters.

[0010] 2. Through multiple frustum-shaped slow-flow pipes, it is convenient to reduce the impact of water hammer effect and avoid excessive impact force that may cause valve damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0013] In the figure: 1. straight pipe; 2. shell; 3. cavity; 4. external thread; 5. internal thread; 6. slow flow pipe. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention. Example

[0016] See attached Figure 1-2As shown, a straight pipe type steel-plastic conversion joint includes a straight pipe 1, and joints are welded at both ends of the straight pipe 1. The joint includes a shell 2, a cavity 3, an external thread 4 and an internal thread 5. The shell 2 is welded at the end of the straight pipe 1, and an external thread 4 is opened on the outside of the shell 2. There are multiple external threads 4, and the diameters of the multiple external threads 4 increase successively from the end of the shell 2 away from the straight pipe 1 to the other end. A cavity 3 is opened in the shell 2, and the cavity 3 is connected with the straight pipe 1. An internal thread 5 is opened on the inner wall of the cavity 3. There are multiple internal threads 5, and the diameters of the multiple internal threads 5 decrease successively from the end of the shell 2 away from the straight pipe 1 to the other end. A slow-flow pipe 6 is fixedly connected in the straight pipe 1. The slow-flow pipe 6 is truncated. The diameter of the inner cavity of the slow-flow pipe 6 gradually decreases from one end to the other end.

[0017] There are multiple slow-flow tubes 6 , and the multiple slow-flow tubes 6 are arranged at equal intervals.

[0018] Working principle: In the utility model, the left joint of the straight pipe 1 is the water inlet pipe joint, and the right side is the water outlet pipe joint, and appropriate internal and external thread connections are selected. If the diameter of the water inlet pipe is larger and the diameter of the water outlet pipe is smaller, the end of the water inlet pipe is screwed on the external thread 4 on the outside of the joint, and the end of the water outlet pipe is screwed on the internal thread 5 in the joint cavity 3. After closing the valve, the impact of water reflux, at the end with smaller diameter of the slow flow pipe 6, part of it flows to the outer wall of the slow flow pipe 6, this part contacts the inner wall of the straight pipe 1, and enters the slow flow pipe 6 after slowing down the impact, and the other part directly enters the slow flow pipe 6, and then as the diameter of the slow flow pipe 6 gradually increases, the impact is slowed down again, and then the impact of the water in the outlet pipe will weaken after reaching the water inlet pipe.

[0019] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0020] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A straight pipe type steel-plastic conversion joint, comprising a straight pipe (1), characterized in that: Joints are welded at both ends of the straight tube (1), and the joints include a shell (2), a cavity (3), an external thread (4), and an internal thread (5). The shell (2) is welded at the end of the straight tube (1). The shell (2) is provided with an external thread (4) on the outside. The number of the external threads (4) is multiple, and the diameters of the multiple external threads (4) increase from the end of the shell (2) away from the straight tube (1) to the other end. A cavity (3) is provided in the shell (2), and the cavity (3) is connected to the straight tube (1). An internal thread (5) is provided on the inner wall of the cavity (3). The number of the internal threads (5) is multiple, and the diameters of the multiple internal threads (5) decrease from the end of the shell (2) away from the straight tube (1) to the other end. A slow flow tube (6) is fixedly connected inside the straight tube (1). The slow flow tube (6) is truncated. The diameter of the slow flow tube (6) decreases gradually from one end to the other end of the inner cavity.

2. A straight pipe steel-plastic conversion joint according to claim 1, characterized in that: There are a plurality of the slow-flow tubes (6), and the plurality of slow-flow tubes (6) are arranged at equal intervals.

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