Hydraulic device for small-caliber plastic pipe

Abstract

The utility model discloses a small-caliber plastic pipe hydraulic device which comprises connectors connected to the two ends of a plastic pipe, each connector comprises a connecting ring and a connecting cavity, threads are arranged at one end of the inner wall of each connecting ring, and the two connecting rings are in threaded connection with a quick connector and an exhaust valve respectively. The connecting cavity is formed in the inner wall of one end of the connecting ring, a sealing ring is fixed to the inner wall of the connecting cavity, an extrusion ring is slidably connected to the inner wall of the connecting cavity, a plurality of connecting rods are fixed to one end of the inner wall of the connecting ring, the same fixing ring is fixed to one ends of the connecting rods, and a nut is in threaded connection with the outer wall of the fixing ring. The connecting cavity, the sealing ring and the extrusion ring are arranged, the extrusion ring axially extrudes the sealing ring, the radial pressure of the sealing ring on the plastic pipe is increased, the plastic pipe is secondarily clamped, and compared with primary clamping and threaded meshing, the outer wall of the plastic pipe cannot be damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of small-diameter plastic pipe testing, in particular to a small-diameter plastic pipe hydraulic device. Background Art

[0002] Hydrostatic strength is one of the important properties of pipes. In the production process of plastic pipes, plastic pipes need to be subjected to pressure tests. Pressure tests refer to subjecting a given section of plastic pipe specimen to a specified constant internal pressure for a given period of time to observe whether the specimen is damaged.

[0003] After searching, the Chinese patent publication number CN211453172U discloses a sealing fixture for hydrostatic testing of plastic pipes, including a joint, a clamping ring and a locking device. One end of the clamping ring is sealed and connected to the joint. The clamping ring is in the shape of a truncated cone with an outer diameter gradually decreasing in the direction away from the joint. The clamping ring is composed of at least two arc-shaped clamping plates. A clamping part is provided on the locking device. The locking device is detachably connected to the joint and clamps the clamping ring.

[0004] The clamping ring of this patent is composed of at least two clamping plates spliced ​​together, so it can adapt to the clamping of plastic pipes with different diameters, but the inner wall of the clamping ring is provided with threads to form a sealing part. When the locking device locks the clamping ring, the force causes the inner thread of the clamping ring to bite into the outer surface of the pipe sample evenly, that is, bite into the outer surface of the plastic pipe. Since the diameter of the small-diameter pipe is thinner, the thread bites into the pipe wall and causes damage, affecting the accuracy of the test data. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a small-caliber plastic pipe hydraulic device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A small-diameter plastic pipe hydraulic device comprises a connector connected to both ends of the plastic pipe, the connector comprises a connecting ring and a connecting cavity, one end of the inner wall of the connecting ring is provided with a thread, the two connecting rings are respectively threadedly connected with a quick connector and an exhaust valve, the connecting cavity is opened on the inner wall of one end of the connecting ring, a sealing ring is fixed to the inner wall of the connecting cavity, the sealing ring is in contact with the outer wall of the plastic pipe, and an extrusion ring is slidably connected to the inner wall of the connecting cavity.

[0008] As a further solution of the utility model: a plurality of connecting rods are fixed to one end of the inner wall of the connecting ring, the connecting rods are L-shaped, a plurality of grooves are opened on the inner wall of the top end of the extrusion ring, the connecting rods are slidably matched with the inner wall of the grooves, and the same fixing ring is fixed to one end of the plurality of connecting rods.

[0009] As a further solution of the utility model: an avoidance groove is opened at one end of the connecting ring, the raised plate at one end of the extrusion ring is slidably matched with the inner wall of the avoidance groove, the connecting rod passes through the raised plate, the outer wall of the fixing ring is threadedly connected with a nut, and a plurality of pushing blocks are fixed to the outer wall of one side of the nut, and one end of the pushing block contacts and slides with the raised plate of the extrusion ring.

[0010] As a further solution of the utility model: a conical cavity is arranged on the inner wall of one end of the nut away from the connecting ring, the narrow opening of the conical cavity faces the direction away from the connecting ring, and two relative clamping plates are slidably fitted on the inner wall of the conical cavity.

[0011] As a further solution of the utility model: a clamping block is fixed to the outer wall of one end of the clamping plate, and an elastic protrusion is fixed to the other end of the clamping block.

[0012] As a further solution of the utility model: one end of the fixing ring is provided with a clamping groove which cooperates with the clamping block.

[0013] As a further solution of the utility model: the inner wall of the clamping block is provided with a rough protrusion, and the rough protrusion is in contact with and cooperates with the outer wall of the plastic tube.

[0014] As a further solution of the utility model: the connection cavity is provided with a downwardly inclined inclined surface at one end close to the sealing ring, the inclination angle of the inclined surface is greater than 50 degrees, and the sealing ring is in contact with the inclined surface.

[0015] Compared with the prior art, the utility model provides a small-caliber plastic pipe hydraulic device, which has the following beneficial effects:

[0016] 1. The utility model is provided with a connecting cavity, a sealing ring and an extrusion ring. The extrusion ring axially extrudes the sealing ring, thereby increasing the radial pressure of the sealing ring on the plastic pipe, and performing a second clamping on the plastic pipe. Compared with a single clamping and threaded engagement, the outer wall of the plastic pipe will not be damaged.

[0017] 2. The utility model is provided with an avoidance groove, a connecting rod, a groove and a pushing block. During the screwing process of the nut and the fixing ring, the pushing block located on one side of the fixing ring squeezes the extrusion ring, so that the other end of the extrusion ring squeezes the sealing ring, so that the two clampings are carried out simultaneously, which is convenient to operate.

[0018] 3. The utility model sets the connecting cavity and one end of the sealing ring as an inclined surface. In the process of the extrusion ring squeezing the sealing ring, the inclined surface can increase the radial pressure of the sealing ring on the plastic pipe under the same radial pressure. Therefore, the axial pressure on the sealing ring can be reduced while ensuring that the clamping force of the sealing ring on the plastic pipe remains unchanged, thereby improving the service life of the sealing ring.

[0019] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a small-diameter plastic pipe hydraulic device proposed by the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of a small-diameter plastic pipe hydraulic device proposed by the utility model;

[0022] Figure 3 A cross-sectional view of a connector of a small-diameter plastic pipe hydraulic device proposed by the utility model;

[0023] Figure 4 This is a partial structural schematic diagram of a small-diameter plastic pipe hydraulic device proposed by the utility model;

[0024] Figure 5 The utility model is a schematic diagram of the overall structure of a clamping plate of a hydraulic device for small-diameter plastic pipes.

[0025] In the figure: 1. plastic pipe; 2. connector; 3. connecting ring; 4. nut; 5. quick connector; 6. exhaust valve; 7. connecting cavity; 8. sealing ring; 9. clamping plate; 10. avoidance groove; 11. connecting rod; 12. fixing ring; 13. extrusion ring; 14. groove; 15. push block; 16. conical cavity; 17. clamping block; 18. elastic protrusion; 19. rough protrusion. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] 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.

[0028] Example 1

[0029] A small diameter plastic pipe hydraulic device, such as Figures 1 to 5As shown, it includes a connector 2 connected to both ends of a plastic pipe 1, the connector 2 includes a connecting ring 3 and a connecting cavity 7, one end of the inner wall of the connecting ring 3 is provided with a thread, and the two connecting rings 3 are respectively threadedly connected with a quick connector 5 and an exhaust valve 6, the connecting cavity 7 is opened on the inner wall of one end of the connecting ring 3, and a sealing ring 8 is fixed to the inner wall of the connecting cavity 7, and the sealing ring 8 is in contact with the outer wall of the plastic pipe 1, and an extrusion ring 13 is slidably connected to the inner wall of the connecting cavity 7, and a plurality of connecting rods 11 are fixed to one end of the inner wall of the connecting ring 3, and the connecting rod 11 is L-shaped, and a plurality of grooves 14 are provided on the inner wall of the top end of the extrusion ring 13, and the connecting rod 11 is slidably matched with the inner wall of the groove 14, and the same fixing ring 12 is fixed to one end of the plurality of connecting rods 11, and an avoidance groove 10 is provided at one end of the connecting ring 3. The raised plate at one end of the ring 13 slides in cooperation with the inner wall of the avoidance groove 10, the connecting rod 11 passes through the raised plate, the outer wall of the fixing ring 12 is threadedly connected with a nut 4, a plurality of pushing blocks 15 are fixed to the outer wall on one side of the nut 4, one end of the pushing block 15 contacts and slides with the raised plate of the extrusion ring 13, a conical cavity 16 is provided on the inner wall of the end of the nut 4 away from the connecting ring 3, the narrow mouth of the conical cavity 16 faces the direction away from the connecting ring 3, the inner wall of the conical cavity 16 slides in cooperation with two relative clamping plates 9, a clamping block 17 is fixed on the outer wall of one end of the clamping plate 9, an elastic protrusion 18 is fixed on the other end of the clamping block 17, a clamping groove matching with the clamping block 17 is provided at one end of the fixing ring 12, a rough protrusion 19 is provided on the inner wall of the clamping block 17, and the rough protrusion 19 contacts and cooperates with the outer wall of the plastic pipe 1.

[0030] When connecting, the nut 4 is inserted into the plastic tube 1, and one end of the plastic tube 1 is inserted into the connecting ring 3. At this time, the sealing ring 8 contacts the outer wall of the plastic tube 1, and then the two clamping plates 9 are buckled on the surface of the plastic tube 1, and the clamping block 17 and the elastic protrusion 18 are clamped into the clamping groove of the fixing ring 12. The fixing ring 12 cooperates with the thread of the nut 4 to connect the nut 4 to the fixing ring 12. During the screwing process of the nut 4 and the fixing ring 12, the conical cavity 16 squeezes the clamping plate 9, so that the rough protrusion 19 on the inner wall of the clamping plate 9 presses the plastic tube 1 once. At the same time, the pushing block 15 located on one side of the fixing ring 12 squeezes the extrusion ring 13, so that the other end of the extrusion ring 13 squeezes the sealing ring 8. The sealing ring 8 is subjected to the axial pressure of the extrusion ring 13, which increases the radial pressure of the sealing ring 8 on the plastic tube 1, and the sealing ring 8 clamps the plastic tube 1 for a second time.

[0031] By providing the connecting cavity 7, the sealing ring 8 and the extrusion ring 13, the radial pressure of the sealing ring 8 on the plastic pipe 1 is increased by the axial extrusion of the sealing ring 8 by the extrusion ring 13, and the plastic pipe 1 is clamped for the second time. Compared with the one-time clamping and the biting through the thread, the outer wall of the plastic pipe 1 will not be damaged.

[0032] By providing the avoidance groove 10, the connecting rod 11, the groove 14 and the pushing block 15, during the screwing process of the nut 4 and the fixing ring 12, the pushing block 15 located on one side of the fixing ring 12 squeezes the extrusion ring 13, so that the other end of the extrusion ring 13 squeezes the sealing ring 8, so that the two clampings are carried out simultaneously, which is convenient for operation.

[0033] Example 2

[0034] A small-diameter plastic pipe hydraulic device, based on Example 1, this embodiment makes the following improvements, such as Figure 3 As shown, the connecting cavity 7 is provided with a downwardly inclined inclined surface at one end close to the sealing ring 8, the inclination angle of the inclined surface is greater than 50 degrees, and the sealing ring 8 is in contact with the inclined surface.

[0035] In the process of the extrusion ring 13 extruding the sealing ring 8, the inclined surface can increase the radial pressure of the sealing ring 8 on the plastic pipe 1 under the condition of the same axial pressure. Therefore, the axial pressure on the sealing ring 8 can be reduced while ensuring that the clamping force of the sealing ring 8 on the plastic pipe 1 remains unchanged, thereby improving the service life of the sealing ring 8.

[0036] By setting the connecting cavity 7 and one end of the sealing ring 8 as an inclined surface, during the process of the extrusion ring 13 squeezing the sealing ring 8, the inclined surface can increase the radial pressure of the sealing ring 8 on the plastic pipe 1 under the condition of the same radial pressure. Therefore, the axial pressure on the sealing ring 8 can be reduced while ensuring that the clamping force of the sealing ring 8 on the plastic pipe 1 remains unchanged, thereby improving the service life of the sealing ring 8.

[0037] Working principle: When connecting, insert the nut 4 into the plastic tube 1, insert one end of the plastic tube 1 into the connecting ring 3, at this time, the sealing ring 8 contacts the outer wall of the plastic tube 1, and then snap the two clamping plates 9 onto the surface of the plastic tube 1, and the clamping block 17 and the elastic protrusion 18 are clamped into the clamping groove of the fixing ring 12, and the fixing ring 12 is matched with the thread of the nut 4 to connect the nut 4 with the fixing ring 12. During the screwing process of the nut 4 and the fixing ring 12, the conical cavity 16 squeezes the clamping plate 9, so that the rough protrusion 19 on the inner wall of the clamping plate 9 presses the plastic tube 1 once, and at the same time, the position The pushing block 15 on one side of the fixing ring 12 squeezes the squeezing ring 13, so that the other end of the squeezing ring 13 squeezes the sealing ring 8. The sealing ring 8 is subjected to the axial pressure of the squeezing ring 13, so that the radial pressure of the sealing ring 8 on the plastic pipe 1 increases, and the sealing ring 8 clamps the plastic pipe 1 for the second time. At the same time, the inclined surface can increase the radial pressure of the sealing ring 8 on the plastic pipe 1 under the same axial pressure. Therefore, the axial pressure on the sealing ring 8 can be reduced while ensuring that the clamping force of the sealing ring 8 on the plastic pipe 1 remains unchanged, thereby improving the service life of the sealing ring 8.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A small-diameter plastic pipe hydraulic device, comprising connectors (2) connected to both ends of a plastic pipe (1), characterized in that: The connector (2) comprises a connecting ring (3) and a connecting cavity (7); one end of the inner wall of the connecting ring (3) is provided with a thread; the two connecting rings (3) are respectively threadedly connected with a quick connector (5) and an exhaust valve (6); the connecting cavity (7) is opened on the inner wall of one end of the connecting ring (3); a sealing ring (8) is fixed to the inner wall of the connecting cavity (7); the sealing ring (8) is in contact with and cooperates with the outer wall of the plastic pipe (1); and the inner wall of the connecting cavity (7) is slidably connected with an extrusion ring (13).

2. A small-diameter plastic pipe hydraulic device according to claim 1, characterized in that: A plurality of connecting rods (11) are fixed to one end of the inner wall of the connecting ring (3), the connecting rods (11) are L-shaped, a plurality of grooves (14) are provided on the inner wall at the top end of the extrusion ring (13), the connecting rods (11) are slidably matched with the inner walls of the grooves (14), and a same fixing ring (12) is fixed to one end of the plurality of connecting rods (11).

3. A small-diameter plastic pipe hydraulic device according to claim 2, characterized in that: An avoidance groove (10) is provided at one end of the connecting ring (3); a raised plate at one end of the extrusion ring (13) is slidably fitted in the inner wall of the avoidance groove (10); the connecting rod (11) passes through the raised plate; a nut (4) is threadedly connected to the outer wall of the fixing ring (12); a plurality of push blocks (15) are fixed to the outer wall of one side of the nut (4); one end of the push block (15) is in contact and slidably fitted in the raised plate of the extrusion ring (13).

4. A small-diameter plastic pipe hydraulic device according to claim 3, characterized in that: A conical cavity (16) is provided on the inner wall of one end of the nut (4) away from the connecting ring (3), the narrow opening of the conical cavity (16) faces in a direction away from the connecting ring (3), and two opposing clamping plates (9) are slidably fitted on the inner wall of the conical cavity (16).

5. A small-diameter plastic pipe hydraulic device according to claim 4, characterized in that: A clamping block (17) is fixed to the outer wall of one end of the clamping plate (9), and an elastic protrusion (18) is fixed to the other end of the clamping block (17).

6. A small-diameter plastic pipe hydraulic device according to claim 2, characterized in that: One end of the fixing ring (12) is provided with a clamping groove which cooperates with the clamping block (17).

7. A small-diameter plastic pipe hydraulic device according to claim 5, characterized in that: The inner wall of the clamping block (17) is provided with a rough protrusion (19), and the rough protrusion (19) is in contact with and fits with the outer wall of the plastic pipe (1).

8. A small-diameter plastic pipe hydraulic device according to claim 1, characterized in that: The connection cavity (7) is provided with a downwardly inclined surface at one end close to the sealing ring (8), the inclination angle of the inclined surface being greater than 50 degrees, and the sealing ring (8) is in contact with the inclined surface.

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