Pipe joint for connecting glass fiber reinforced plastic electric power pipes

Abstract

The utility model discloses a pipe joint for connecting glass fiber reinforced plastic electric power pipes, which is characterized in that an annular step is arranged in the middle of the inner surface of the pipe joint, at least one annular groove is respectively arranged on the inner surface of the pipe joint on two sides of the step, a rubber sealing ring is embedded in the annular groove, an annular clamping groove is arranged on the inner annular surface of the rubber sealing ring, and the annular clamping groove is connected with the annular step. According to the utility model, the inner side of the pipe joint is provided with the annular step and the annular groove, so that the outer surface of the inserted electric power pipe extrudes the rubber sealing ring and performs multi-channel sealing through the rubber sealing ring, and the elastic clamping ring on the sealing ring clamps the sealing ring; according to the utility model, the inner cavity of the power tube is smooth due to the annular step with the same inner diameter as the power tube, and the cable penetrating quality in the power tube is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power pipes, in particular to a pipe joint for connecting glass fiber reinforced plastic electric power pipes, which has a simple structure and convenient connection. Background Art

[0002] The glass fiber reinforced plastic electric power pipe is a product coated with PE (modified polyethylene) by hot dip coating or epoxy resin on the inside and outside, and has excellent corrosion resistance. At the same time, the coating itself also has good electrical insulation, will not cause electrolytic corrosion, has a low water absorption rate, high mechanical strength, and a small friction coefficient, can achieve the purpose of long-term use, and can effectively prevent the damage of plant roots and soil environmental stress, etc.

[0003] When the glass fiber reinforced plastic electric power pipe is buried over a long distance, a lengthening operation is required. The prior art generally wraps and sleeves the joints of two glass fiber reinforced plastic electric power pipes and then directly lays them in the trench. The structural strength of the connection is low, which is likely to cause a decrease in the sealing performance at the pipe end connection. For this reason, Chinese Patent No. 202222151218X, titled "A highly sealed plug-in connection end for connecting electric power pipes", discloses a technical solution of a highly sealed plug-in connection end, including a connection fitting for connecting two electric power pipes, sealing rings are arranged on the inner sides of the connection fittings, and locking rings for locking the electric power pipes and the connection fittings are arranged at both ends of the outer circumference of the connection fittings. This patent locks the electric power pipes and the connection fittings through an external locking device, making the electric power pipes and the connection fittings not easily fall off and improving the sealing performance and stability of the connection. However, since the above technical solution requires opening sealing grooves for placing sealing rings at both ends of the electric power pipe and designing an external assembled locking device on the connection fitting, it causes problems such as complex structure of the connection end for connecting electric power pipes, difficult on-site processing of the pipe grooves of the electric power pipe, and low connection operation efficiency. Summary of the Utility Model

[0004] The utility model mainly solves the above-mentioned existing technical problems; provides a pipe joint for connecting glass fiber reinforced plastic electric power pipes, which has a simple structure and convenient connection.

[0005] In order to solve the above-mentioned existing technical problems, the utility model mainly adopts the following technical scheme:

[0006] A pipe joint for connecting fiberglass-reinforced plastic power pipes of the present utility model. The pipe orifice of the power pipe is provided with an external chamfer. The inner diameter of the pipe joint is in line with the outer diameter of the above-mentioned power pipe and accommodates the insertion of the power pipe. In the middle of the inner surface of the pipe joint, there is an annular step. The height of the step is in line with the wall thickness of the above-mentioned power pipe. On the inner surfaces of the pipe joint on both sides of the step, there are at least one annular groove respectively. A rubber sealing ring is embedded in the annular groove. The thickness of the rubber sealing ring is greater than the depth of the groove. The end of the power pipe is inserted into the pipe joint and abuts against the side surface of the annular step. The outer surface of the power pipe squeezes the rubber sealing ring to form multiple axial sealing structures, and the annular step forms a positioning structure for the insertion depth of the power pipe in the pipe joint.

[0007] Preferably, an annular clamping groove is provided on the inner ring surface of the rubber sealing ring. An open elastic clamping ring is embedded in the annular clamping groove. The diameter of the elastic clamping ring in the free state is greater than the diameter of the above-mentioned annular clamping groove. The thickness of the elastic clamping ring is less than the groove depth of the annular clamping groove. The compressed and deformed elastic clamping ring is embedded in the annular clamping groove and elastically expands, squeezing the rubber sealing ring to closely adhere to the bottom surface of the annular groove, preventing the rubber sealing ring from deforming and coming out when the power pipe is inserted and pushed, and improving the connection stability between the pipe joint and the power pipe.

[0008] Preferably, the material of the elastic clamping ring is an elastic steel strip, and a layer of plastic is coated on the surface of the elastic steel strip.

[0009] Preferably, the cross-section of the rubber sealing ring is trapezoidal. Its trapezoidal lower bottom surface fits the bottom surface of the annular groove. Its trapezoidal base angle is in line with the external chamfer of the pipe end of the above-mentioned power pipe. When the power pipe is inserted, its pipe end gradually squeezes the above-mentioned sealing ring through the inclined surface of the external chamfer, deforming and compressing the sealing ring, so that the end of the power pipe can be inserted and fit against the side surface of the annular step in the middle of the pipe joint. The compressed sealing ring can ensure the axial sealing effect between the inner surface of the pipe joint and the outer surface of the power pipe. At the same time, the deformed sealing ring also generates a radial frictional force on the outer surface of the power pipe and sucks the outer surface of the power pipe, reversely blocking the withdrawal of the power pipe and improving the connection strength between the power pipe and the pipe joint.

[0010] Preferably, sealing gaskets with equal thickness are provided on both side surfaces of the annular step. The outer diameter of the sealing gasket is equal to the inner diameter of the pipe joint. The inner diameter of the rubber sealing gasket is equal to the inner diameter of the annular step. The sealing gasket can perform end face sealing between the power pipe and the pipe joint, improving the radial sealing performance between the end face of the power pipe and the pipe joint.

[0011] Preferably, an annular groove concentric with the annular step is provided on the side surface of the annular step. A convex ring that is concentric with the sealing gasket and matches the above-mentioned annular groove is provided on the surface of the sealing gasket. The convex ring is embedded in the above-mentioned groove. By using the cooperation of the convex ring and the groove, the sealing performance between the sealing gasket and the side surface of the annular step can be improved.

[0012] The beneficial effects of the present utility model are as follows: An annular step and an annular groove are provided inside the pipe joint, so that the outer surface of the inserted glass fiber reinforced plastic power pipe extrudes the rubber sealing ring and multiple seals are carried out through the rubber sealing ring. The elastic snap ring on the sealing ring clamps the sealing ring to prevent the extrusion displacement that may occur during the insertion process, improving the stability of the seal. At the same time, the annular step equal to the inner diameter of the power pipe ensures the smoothness of the inner cavity of the power pipe and improves the threading quality of the cables inside the power pipe. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the pipe joint of the present utility model.

[0014] Figure 2 is Figure 1 an exploded schematic diagram of the structure.

[0015] Figure 3 is Figure 1 a schematic cross-sectional diagram of the structure.

[0016] Figure 4 is a schematic diagram of the use of the present utility model.

[0017] In the figure, 10. Glass fiber reinforced plastic power pipe, 101. Outer chamfer, 20. Pipe joint, 201. Annular step, 202. Annular groove, 30. Rubber sealing ring, 301. Annular clamping groove, 40. Elastic snap ring, 50. Sealing gasket. Detailed Embodiment

[0018] Next, through embodiments and in combination with the drawings, the technical solutions of the present utility model will be further specifically described.

[0019] Embodiment: A pipe joint for connecting glass fiber reinforced plastic power pipes in this embodiment. An outer chamfer 101 is designed at the pipe orifice of the above-mentioned power pipe 10, as Figure 1 , Figure 2 and Figure 3As shown, the inner diameter of the pipe joint 20 matches the outer diameter of the power pipe and accommodates the insertion of the power pipe. In the middle of the inner surface of the pipe joint, an annular step 201 is designed. The height of the annular step matches the wall thickness of the power pipe. On the inner surface of the pipe joint on both sides of the step, two annular grooves 202 are respectively provided. A rubber sealing ring 30 is embedded in the annular groove. The cross-section of the rubber sealing ring is trapezoidal. The lower bottom surface of the trapezoid fits the bottom surface of the annular groove. The trapezoidal base angle matches the outer chamfer of the pipe end of the above-mentioned power pipe. The trapezoidal height is greater than the depth of the above-mentioned annular groove. In the center of the trapezoidal top surface of the rubber sealing ring, an annular clamping groove 301 is designed. An open elastic snap ring 40 is embedded in the annular clamping groove. The diameter of the elastic snap ring in the free state is greater than the diameter of the annular clamping groove. The thickness of the elastic snap ring is less than the groove depth of the annular clamping groove. On both sides of the annular step, gaskets 50 with equal thickness are provided. The outer diameter of the gasket is equal to the inner diameter of the pipe joint. The inner diameter of the gasket is equal to the inner diameter of the annular step. The gasket fits the side surface of the annular step.

[0020] As Figure 4 shown, in use, the gasket is inserted into the pipe joint and the gasket is made to fit the side surface of the annular step. Then, the corresponding rubber sealing rings are respectively embedded into the annular grooves on the inner surface of the pipe joint. Then, the elastic snap ring is compressed and embedded into the annular clamping groove on the rubber sealing ring. The elastic snap ring is released. The elastic snap ring expands and squeezes the rubber sealing ring to closely adhere to the annular groove of the pipe joint. Next, the pipe end of the power pipe is inserted into the inner cavity of the pipe joint and slowly pushed forward. When the pipe end of the power pipe reaches the rubber sealing ring, the outer chamfered surface of the pipe end of the power pipe squeezes the rubber sealing ring and deforms and compresses it. Continuing to push forward, the pipe end of the power pipe closely adheres to the surface of the gasket and is positioned on the side surface of the annular step, completing the insertion connection of the power pipe. At this time, the compressed rubber sealing ring forms a radial frictional force on the outer surface of the power pipe and sucks the outer surface of the power pipe, which can reversely block the withdrawal of the power pipe, improving the connection strength between the power pipe and the pipe joint. At the same time, the rubber sealing ring forms multiple axial sealing structures between the power pipe and the pipe joint, and the gasket forms a radial sealing structure between the power pipe and the pipe joint.

[0021] In the description of the present invention, the technical terms "upper", "lower", "front", "rear", "left", "right", "longitudinal", "transverse", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing and understanding the technical solution of the present invention. The above description does not limit the present invention, and the present invention is not limited to the examples described above. Changes, modifications, additions, or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A pipe joint for connecting a glass fiber reinforced plastic power pipe, wherein the pipe mouth of the power pipe (10) is provided with an outer chamfer (101), and the power pipe is inserted into the pipe joint (20), characterized in that: The inner diameter of the pipe joint matches the outer diameter of the electric power pipe and accommodates the insertion of the electric power pipe. An annular step (201) is provided in the middle of the inner surface of the pipe joint. The height of the step matches the wall thickness of the electric power pipe. At least one annular groove (202) is provided on the inner surface of the pipe joint on both sides of the step. A rubber sealing ring (30) is embedded in the annular groove. The thickness of the rubber sealing ring is greater than the depth of the groove.

2. The pipe joint for connecting glass fiber reinforced plastic power pipes according to claim 1, characterized in that: An annular groove (301) is provided on the inner annular surface of the rubber sealing ring (30), and an open elastic snap ring (40) is embedded in the annular groove. The diameter of the elastic snap ring in a free state is larger than the diameter of the annular groove, and the thickness of the elastic snap ring is smaller than the groove depth of the annular groove.

3. The pipe joint for connecting glass fiber reinforced plastic power pipes according to claim 2, characterized in that: The elastic clamping ring (40) is made of an elastic steel belt, and the surface of the elastic steel belt is coated with a layer of plastic.

4. A pipe joint for connecting glass fiber reinforced plastic power pipes according to claim 1, 2 or 3, characterized in that: The cross section of the rubber sealing ring (30) is trapezoidal, the lower bottom surface of the trapezoid fits the bottom surface of the annular groove (202), and the bottom angle of the trapezoid matches the outer chamfer of the tube end of the power tube (10).

5. The pipe joint for connecting glass fiber reinforced plastic power pipes according to claim 1, characterized in that: Both sides of the annular step (201) are provided with sealing gaskets (50) of equal thickness, the outer diameter of the sealing gasket is equal to the inner diameter of the pipe joint (20), and the inner diameter of the sealing gasket is equal to the inner diameter of the annular step.

6. The pipe joint for connecting glass fiber reinforced plastic power pipes according to claim 5, characterized in that: The side surface of the annular step (201) is provided with an annular groove concentric with the annular step, and the surface of the sealing gasket (50) is provided with a convex ring matching the annular groove and concentric with the sealing gasket, and the convex ring is embedded in the groove.

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