Reducing connecting structure for PVC (polyvinyl chloride) pipe fitting

Abstract

The utility model discloses a reducing connection structure for PVC pipe fittings, which comprises a first connecting pipe, a second connecting pipe and two limit rings, one end of the first connecting pipe is fixedly connected with an external thread cylinder, one end of the second connecting pipe is fixedly connected with an internal thread cylinder, the internal thread cylinder is in threaded connection with the external thread cylinder, and the two limit rings are fixedly connected with the external thread cylinder. A limiting pipe is connected between the first connecting pipe and the second connecting pipe in an inserted mode, the limiting pipe penetrates through the outer threaded cylinder and the inner threaded cylinder, and limiting rings are connected into the first connecting pipe and the second connecting pipe in a sliding mode. The two limiting rings are placed in the first connecting pipe and the second connecting pipe from the external threaded cylinder and the internal threaded cylinder respectively, and then the first connecting pipe and the second connecting pipe are connected together through connection of the internal threaded cylinder and the external threaded cylinder, so that the two ends of each limiting pipe abut against the two limiting rings, and then the limiting rings are fixed; therefore, the small-caliber PVC pipe and the large-caliber PVC pipe can be quickly replaced and mounted, and the operation is simple, convenient and quick.

Description

Technical Field

[0001] This utility model relates to the field of PVC pipe technology, and in particular to a reducing connection structure for PVC pipe fittings. Background Technology

[0002] During the connection process of PVC pipes, it is often necessary to connect PVC pipes of different diameters. The existing technology selects an auxiliary pipe with a diameter between the two pipes and heat-fused it to each pipe to complete the connection. However, this method cannot meet the needs when dealing with pipes with large diameter differences.

[0003] A search revealed Chinese patent CN222392292U, which discloses a composite PVC pipe with varying diameters. This patent uses a combination of locking blocks and slots to achieve quick, labor-saving, and convenient installation. However, this method requires multiple locking blocks to be installed and fixed on the outer surface of the pipe using a heat-fusion method, which is time-consuming and labor-intensive. Furthermore, the lack of an internal sealing mechanism can easily lead to leakage. To advance industry technology, better realize the function of connecting pipes with varying diameters, and improve core technological competitiveness, this application proposes a new implementation scheme for a composite PVC pipe with varying diameters, different from existing technologies. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of time-consuming and labor-intensive installation methods and lack of sealing of pipe bodies in existing methods, and to propose a reducing connection structure for PVC pipe fittings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A reducing connection structure for PVC pipe fittings includes a first connecting pipe and a second connecting pipe. One end of the first connecting pipe is fixedly connected to an externally threaded cylinder, and one end of the second connecting pipe is fixedly connected to an internally threaded cylinder. The internally threaded cylinder is threadedly connected to the externally threaded cylinder. A limiting tube is inserted between the first connecting pipe and the second connecting pipe, passing through the externally threaded cylinder and the internally threaded cylinder. Limiting rings are slidably connected inside both the first and second connecting pipes. The two ends of the limiting tube abut against the two limiting rings respectively. Sealing rings are snapped onto both sides of the limiting rings. A small-diameter installation pipe is fixedly connected to one side of one of the limiting rings, and a large-diameter installation pipe is fixedly connected to one side of the other limiting ring.

[0007] Furthermore, the other end of the small-diameter installation pipe is fixedly connected to a small-diameter PVC pipe in the outside, and the other end of the large-diameter installation pipe is fixedly connected to a large-diameter PVC pipe in the outside.

[0008] Furthermore, tight clamps are fitted at the connection points between the small-diameter installation pipe and the small-diameter PVC pipe, and at the connection points between the large-diameter installation pipe and the large-diameter installation pipe.

[0009] Furthermore, a fixing bolt is threaded between the two ends of the clamp, and an anti-loosening nut is threaded to one end of the fixing bolt.

[0010] Furthermore, the sealing ring is a rubber ring.

[0011] Furthermore, the diameter of the small-diameter installation tube is 20mm-80mm, and the diameter of the large-diameter installation tube is 50mm-150mm.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. By inserting two limiting rings into the first and second connecting pipes respectively from the external threaded cylinder and the internal threaded cylinder, and then connecting the first and second connecting pipes together using the connection between the internal threaded cylinder and the external threaded cylinder, the two ends of the limiting pipe abut against the two limiting rings, thereby fixing the limiting rings. This allows for the quick replacement and installation of small-diameter and large-diameter PVC pipes, and the operation is simple, convenient and fast.

[0014] 2. The sealing rings can seal the inner walls of the two limiting rings with the first and second connecting pipes, thereby improving the sealing performance of the pipe body. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a reducing connection structure for PVC pipe fittings proposed in this utility model;

[0016] Figure 2 This is a cross-sectional view of a reducing connection structure for PVC pipe fittings proposed in this utility model.

[0017] Figure 3 This is an exploded structural diagram of a reducing connection structure for PVC pipe fittings proposed in this utility model;

[0018] Figure 4 This is a partially enlarged structural diagram of a reducing connection structure for PVC pipe fittings proposed in this utility model.

[0019] In the diagram: 1. First connecting pipe; 101. External threaded cylinder; 2. Second connecting pipe; 201. Internal threaded cylinder; 3. Limiting pipe; 4. Limiting ring; 5. Small diameter installation pipe; 6. Small diameter PVC pipe; 7. Sealing ring; 8. Hoop; 9. Fixing bolt; 10. Large diameter installation pipe; 11. Large diameter PVC pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1-4 A reducing connection structure for PVC pipe fittings includes a first connecting pipe 1, a second connecting pipe 2, and two limiting rings 4. One of the limiting rings 4 has a small-diameter installation pipe 5 integrally formed on one side, and the other limiting ring 4 has a large-diameter installation pipe 10 integrally formed on one side. The diameter of the small-diameter installation pipe 5 is 20mm-80mm, and the diameter of the large-diameter installation pipe 10 is 50mm-150mm.

[0022] One end of the first connecting pipe 1 is integrally formed with an external threaded cylinder 101, and one end of the second connecting pipe 2 is integrally formed with an internal threaded cylinder 201. The internal threaded cylinder 201 is threadedly connected to the external threaded cylinder 101, and the first connecting pipe 1 and the second connecting pipe 2 are connected together by the connection between the internal threaded cylinder 201 and the external threaded cylinder 101.

[0023] The first connecting pipe 1 and the second connecting pipe 2 have the same inner diameter. A limiting pipe 3 is inserted between the first connecting pipe 1 and the second connecting pipe 2. The outer diameter of the limiting pipe 3 is the same as the inner diameter of the first connecting pipe 1 and the second connecting pipe 2. The limiting pipe 3 passes through the external threaded cylinder 101 and the internal threaded cylinder 201.

[0024] Limiting rings 4 are slidably connected inside both the first connecting pipe 1 and the second connecting pipe 2. The outer diameter of the limiting rings 4 is the same as that of the limiting pipe 3. Sealing rings 7 are snapped onto both sides of the limiting rings 4. The sealing rings 7 are rubber rings. The two ends of the limiting pipe 3 abut against the two limiting rings 4 respectively. During the compression process, the two ends of the limiting pipe 3 form a sealed connection with the sealing rings 7, thereby sealing and communicating with the limiting rings 4. The limiting rings 4 at both ends are pressed tightly inside the first connecting pipe 1 and the second connecting pipe 2, thereby sealing the two limiting rings 4 with the inner walls of the first connecting pipe 1 and the second connecting pipe 2.

[0025] It should be noted that the two limiting rings 4 have the same diameter, only the small-diameter installation pipe 5 and the large-diameter installation pipe 10 at one end have different diameters. When dealing with pipe connections with large size differences, it is necessary to select and replace the appropriate diameter installation pipe according to the actual situation.

[0026] When connecting small-diameter pipes, select a small-diameter installation pipe 5 with a diameter close to that of the external small-diameter PVC pipe 6 according to the actual situation, and use equipment such as a hot spray gun to heat-melt weld the other end of the small-diameter installation pipe 5 to the external small-diameter PVC pipe 6.

[0027] When connecting large-diameter pipes, select a large-diameter installation pipe 10 with a diameter close to that of the external large-diameter PVC pipe 11 according to the actual situation, and use equipment such as a hot spray gun to heat-melt weld the other end of the large-diameter installation pipe 10 to the external large-diameter PVC pipe 11.

[0028] The working principle of this embodiment is as follows: First, select a small-diameter installation pipe 5 with a diameter close to that of the external small-diameter PVC pipe 6, and a large-diameter installation pipe 10 with a diameter close to that of the external large-diameter PVC pipe 11. Then, insert two limiting rings 4 into the first connecting pipe 1 and the second connecting pipe 2 from the external threaded cylinder 101 and the internal threaded cylinder 201 respectively. At this time, the small-diameter installation pipe 5 and the large-diameter installation pipe 10 pass through one end of the first connecting pipe 1 and the second connecting pipe 2 respectively. Then, insert the limiting pipe 3 between the first connecting pipe 1 and the second connecting pipe 2. Then, connect the first connecting pipe 1 and the second connecting pipe 2 together by connecting the internal threaded cylinder 201 and the external threaded cylinder 101, so that the two ends of the limiting pipe 3 abut against the two limiting rings 4, thereby fixing the limiting rings 4. It is also possible to choose whether to apply glue between the internal threaded cylinder 201 and the external threaded cylinder 101 to increase the fastening force, depending on the actual situation.

[0029] Finally, the small-diameter PVC pipe 6 and the large-diameter PVC pipe 11 are heat-fused to one end of the small-diameter installation pipe 5 and the large-diameter installation pipe 10, respectively. The sealing performance is then tested by external equipment or fluid. Once the test is passed, the connection process is complete.

[0030] Example 2

[0031] The difference between this embodiment and embodiment 1 is that a clamp 8 is fitted at the connection between the small-diameter installation pipe 5 and the small-diameter PVC pipe 6, and at the connection between the large-diameter installation pipe 10 and the large-diameter installation pipe 11. A fixing bolt 9 is threaded between the two ends of the clamp 8, and a lock nut is threaded to one end of the fixing bolt 9. Tightening the lock nut fixes the clamp 8, thereby reinforcing the connection between the small-diameter installation pipe 5 and the small-diameter PVC pipe 6, and the connection between the large-diameter installation pipe 10 and the large-diameter PVC pipe 11.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A reducing connection structure for PVC pipe fittings, comprising a first connecting pipe (1), a second connecting pipe (2), and two limiting rings (4), characterized in that, One end of the first connecting pipe (1) is fixedly connected to an external threaded cylinder (101), and one end of the second connecting pipe (2) is fixedly connected to an internal threaded cylinder (201). The internal threaded cylinder (201) is threadedly connected to the external threaded cylinder (101). A limiting pipe (3) is inserted between the first connecting pipe (1) and the second connecting pipe (2). The limiting pipe (3) passes through the external threaded cylinder (101) and the internal threaded cylinder (201). A limiting ring (4) is slidably connected inside both the first connecting pipe (1) and the second connecting pipe (2). The two ends of the limiting pipe (3) abut against the two limiting rings (4) respectively. A sealing ring (7) is snapped onto both sides of the limiting ring (4). A small-diameter installation pipe (5) is fixedly connected to one side of one of the limiting rings (4), and a large-diameter installation pipe (10) is fixedly connected to one side of the other limiting ring (4).

2. The reducing connection structure for PVC pipe fittings according to claim 1, characterized in that, The other end of the small-diameter installation pipe (5) is fixedly connected to the small-diameter PVC pipe (6) outside, and the other end of the large-diameter installation pipe (10) is fixedly connected to the large-diameter PVC pipe (11) outside.

3. The reducing connection structure for PVC pipe fittings according to claim 2, characterized in that, The connection between the small-diameter installation pipe (5) and the small-diameter PVC pipe (6) and the connection between the large-diameter installation pipe (10) and the large-diameter installation pipe (10) are both fitted with clamps (8).

4. The reducing connection structure for PVC pipe fittings according to claim 3, characterized in that, A fixing bolt (9) is threaded between the two ends of the clamp (8), and an anti-loosening nut is threaded to one end of the fixing bolt (9).

5. The reducing connection structure for PVC pipe fittings according to claim 1, characterized in that, The sealing ring (7) is a rubber ring.

6. The reducing connection structure for PVC pipe fittings according to claim 1, characterized in that, The diameter of the small-diameter installation pipe (5) is 20mm-80mm, and the diameter of the large-diameter installation pipe (10) is 50mm-150mm.

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