Flanged bend hydrostatic testing device

Abstract

This utility model discloses a hydraulic pressure testing device for flanged bends, including a pressure testing device and a pressure gauge. The inlet of the pressure testing device is connected sequentially to the pressure relief port of the pressure testing device via a high-pressure inlet hose, an inlet pipe connector, a lower flange sealing assembly, a bend assembly, an upper flange sealing assembly, an outlet pipe connector, and a high-pressure relief hose to form a circuit. The upper and lower flange sealing plates only need to have a sealing ring embedded in the annular groove on the end face to fit against the flange face of the bend. The diameter of the sealing ring is larger than the inner diameter of the bend body, and it is not limited by the bend angle, making it suitable for bends from 0 to 270°. The upper and lower flange sealing plates are locked with bolts, eliminating the need for a press and support frame for fixation. The bolts are locked on the outside of the flange sealing plates, eliminating space limitations and the need to consider force balance, making operation simple.

Description

Technical Field

[0001] This utility model belongs to the field of water pressure testing devices, specifically relating to a water pressure testing device with a flanged bend. Background Technology

[0002] Hydraulic pressure testing is a method for detecting the airtightness of workpieces. Its main purpose is to test the strength of pressure-bearing components and expose their defects without damaging them. Water is added to the equipment and pressurized to check for leaks or deformation. Hydraulic pressure testing of pure bends mainly involves installing plugs at both ends of the bend and applying pressure to the plugs with a pressurizing machine to completely seal the bend. Alternatively, a hydraulic pressure testing sealing device consisting of a liner pipe connection can be used to seal the sockets at both ends of the bend before injecting water to test the pressure. For example, invention patent 201110369773.3, "Hydraulic Pressure Testing Sealing Device for Large Diameter Elbow Pipe Fittings," uses a liner pipe and two plug sleeves for a sealed connection to seal the two sockets in the bend pipe fitting. However, the problems are as follows: 1) The diameter of the sealing groove on the flange of the bushing and the flange of the plug sleeve must be the same, which is difficult to process. Otherwise, the sealing ring is easily sheared, causing leakage; 2) The flange is connected to the inside of the plug sleeve and the bushing by bolts. The space is limited, and it is difficult to lock; 3) The socket mating surface of the plug sleeve and the elbow fitting has extremely high requirements. Otherwise, leakage will also occur; 4) The use of two vertically oriented press sealing plates and support frames for fixing is complex and inconvenient to operate.

[0003] For water pressure testing of flanged pipes that are not 90° bends, there is currently no good method for sealing the socket and liner of the flange without elbow fittings; moreover, it is difficult to balance the pressure applied by two press sealing plates with the support frame support force. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, this utility model provides a flanged bend water pressure testing device that is simple in structure, easy to operate, has good connection and sealing performance, and high reliability.

[0005] To achieve the above objectives, this utility model provides a hydraulic pressure testing device with a flanged bend, including a pressure testing device and a pressure gauge; the inlet of the pressure testing device is connected in sequence to the pressure relief port of the pressure testing device via an inlet high-pressure hose, an inlet pipe joint, a lower flange sealing assembly, a bend assembly, an upper flange sealing assembly, an outlet pipe joint, and a pressure relief high-pressure hose to form a circuit.

[0006] Furthermore, the pipe bending assembly includes a pipe bending body, a lower flange welded to one end of the pipe bending body, and an upper flange welded to the other end of the pipe bending body.

[0007] Furthermore, the lower flange sealing assembly includes a combined lower flange pressure ring and a lower flange sealing plate. The inner surface of the lower flange sealing plate that mates with the lower flange has an annular groove larger than the inner diameter of the bend body. The combined lower flange pressure ring is fitted onto the bend body, and a sealing ring is placed in the annular groove of the lower flange sealing plate. After the lower flange sealing plate mates with the lower flange, the combined lower flange pressure ring and the lower flange sealing plate are locked together with bolts and nuts to seal the lower flange.

[0008] Furthermore, the pitch circle and diameter of the flange hole on the combined lower flange pressure ring are consistent with the flange hole on the lower flange sealing plate, which facilitates the insertion and tightening of bolt assemblies.

[0009] Furthermore, the combined lower flange pressure ring includes two half-rings, which are combined from both sides of the bend body to form a complete ring in the form of pins.

[0010] Furthermore, the combined lower flange pressure ring includes two half-rings, one half-ring having a groove at one end and a protrusion at the other end, and correspondingly, the other half-ring having a groove at one end and a protrusion at the other end. The groove and the protrusion are inserted and fitted together, so that the two half-rings form a complete ring.

[0011] Furthermore, the upper flange sealing assembly includes an upper flange sealing plate. An annular groove larger than the inner diameter of the bend body is opened in the middle of the inner surface of the upper flange sealing plate that mates with the upper flange. A sealing ring is placed in the annular groove of the upper flange sealing plate. After the upper flange sealing plate and the upper flange are mated, the upper flange sealing plate and the upper flange are locked together by bolts and nuts to seal and lock the upper flange sealing plate and the upper flange.

[0012] Furthermore, the pitch circle and diameter of the flange hole on the upper flange end plate are consistent with those of the flange hole on the upper flange, which facilitates the insertion and tightening of the bolt assembly.

[0013] Furthermore, the lower flange sealing plate is provided with two internal threaded holes, which are respectively connected to the water inlet pipe joint and the first pressure gauge pipe joint. The first pressure gauge joint is then connected to the first pressure gauge through the first pressure gauge pipe.

[0014] Furthermore, the upper flange sealing plate is provided with two internal threaded holes, which are respectively connected to a water pipe connector and a second pressure gauge pipe connector. The second pressure gauge pipe connector is then connected to the second pressure gauge through a second pressure gauge connecting pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The annular grooves on the upper and lower flanges do not need to be machined. Just make sure the inner diameter of the annular groove is larger than the inner diameter of the bend, remove the sharp corners and burrs, and put in the sealing ring to achieve the sealing effect. The machining accuracy requirement is not high.

[0016] (2) The upper and lower flange sealing plates are locked with bolts, without the need for a press and support frame for fixing. The nuts are locked on the outside of the flange sealing plates, which is not limited by space and does not require consideration of force balance, making the operation simple.

[0017] (3) The upper and lower flange sealing plates and the combined lower flange pressure ring can be repeatedly used for water pressure tests of flanged bends of the same specification.

[0018] (4) The upper and lower flange sealing plates only need to fit against the flange face of the bend, and are not limited by the bend angle. They are suitable for bends of 0~270°. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the hydraulic pressure testing device with flange bend of this utility model; Figure 2 for Figure 1 Exploded view of the structure of the lower flange sealing plate, the bend assembly, and the upper flange sealing plate; Figure 3 for Figure 2 A schematic diagram of the structure of the combined lower flange pressure ring. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 The flanged bend water pressure test device shown includes a pressure testing device 1 and a pressure gauge; the inlet of the pressure testing device 1 is connected in sequence to the pressure relief port of the pressure testing device 1 via the inlet high pressure hose 2, the inlet pipe joint 11, the lower flange sealing assembly, the bend assembly, the upper flange sealing assembly, the outlet pipe joint 10, and the pressure relief high pressure hose 3 to form a circuit.

[0022] See Figure 2 , 3 The bend assembly shown includes a bend body 7, a lower flange 12 welded to one end of the bend body 7, and an upper flange 8 welded to the other end of the bend body 7. The lower flange sealing assembly includes a combined lower flange pressure ring 6 and a lower flange sealing plate 5. The combined lower flange pressure ring 6 includes two half-rings. The inner surface of the lower flange sealing plate 5 and the lower flange 12 has an annular groove 13 larger than the inner diameter of the bend body 7. The two half-rings are combined into a complete ring from both sides of the bend body 7 in the form of pins. A sealing ring is placed in the annular groove 13 of the lower flange sealing plate 5. After the lower flange sealing plate 5 and the lower flange 12 are mated, the combined lower flange pressure ring 6 and the lower flange sealing plate 5 are locked together with bolts and nuts to seal the lower flange sealing plate 5 and the lower flange 12.

[0023] The upper flange sealing assembly includes an upper flange sealing plate 9. An annular groove 13 larger than the inner diameter of the bend body is opened in the middle of the inner surface of the upper flange sealing plate 9 and the upper flange 8. A sealing ring is placed in the annular groove 13 of the upper flange sealing plate 9. After the upper flange sealing plate 9 and the upper flange 8 are mated, the upper flange sealing plate 9 and the upper flange 8 are locked together by bolts and nuts to seal and lock the upper flange sealing plate 9 and the upper flange 8.

[0024] The lower flange sealing plate 5 has two internal threaded holes, which are respectively connected to the water inlet pipe connector 11 and the first pressure gauge pipe connector 4. The first pressure gauge connector 4 is then connected to the first pressure gauge 15 through the first pressure gauge pipe connector 16. The upper flange sealing plate 9 has two internal threaded holes, which are respectively connected to the water outlet pipe connector 10 and the second pressure gauge pipe connector 14. The second pressure gauge pipe connector 14 is then connected to the second pressure gauge 18 through the second pressure gauge pipe connector 17.

[0025] like Figure 3 As shown, in the combined lower flange pressure ring 6, one half ring has a groove at one end and a protrusion at the other end. Correspondingly, the other half ring has a groove at one end and a protrusion at the other end. The groove and the protrusion are inserted and fitted together to form a complete ring.

[0026] Because the lower flange 12 is a hollow annular structure with a thin flange ring wall, no auxiliary materials are needed to machine the flange holes for inserting bolts and nuts to lock and seal the lower flange sealing plate 5. Therefore, the pitch circle and diameter of the flange hole on the combined lower flange pressure ring 6 are consistent with the flange hole on the lower flange sealing plate 5, facilitating the insertion and tightening of the bolt assembly. Meanwhile, the pitch circle and diameter of the flange hole on the upper flange sealing plate 9 are consistent with the original flange hole on the upper flange 8, facilitating the insertion and tightening of the bolt assembly.

[0027] After the combined lower flange pressure ring 6, upper flange sealing plate 9, and lower flange sealing plate 5 pass the water pressure test, they can be removed and reused.

[0028] Test method: When filling with water, first remove the first pressure gauge 15 and open the first pressure gauge connector 16 to release air; at the same time, remove the second pressure gauge 18 so that the tail of the second pressure gauge connector 17 is at the same height as the first pressure gauge connector 16; inject water into the circuit to fill the entire circuit, and after the air is purged, reconnect the first pressure gauge 15 and the second pressure gauge 18.

[0029] The pressure testing device 1 starts to pressurize. By increasing the water volume into the bend assembly, the rate of pressure increase and decrease can be effectively controlled. The pressure is increased step by step. The values ​​displayed by the first pressure gauge 15 and the second pressure gauge 18 are the pressure values ​​that the bend assembly can withstand for the water pressure test. When the pressure value required for the test is reached, and the two pressure gauges maintain this pressure value for the required time, if there is no abnormal deformation or noise in the pipe fittings and no leakage in the pipe wall, it is considered qualified.

[0030] When the pressure values ​​of the two pressure gauges differ significantly, it is easy to determine that a leak or other problem has occurred during the test, rendering the test invalid. Abnormal deformation or noise indicates a failure to pass the test.

Claims

1. A hydraulic pressure testing device with a flanged bend, comprising a pressure testing device (1) and a pressure gauge; characterized in that: The inlet of the pressure testing equipment (1) is connected to the pressure relief port of the pressure testing equipment (1) in sequence via the inlet high-pressure hose (2), the inlet pipe joint (11), the lower flange sealing assembly, the bend assembly, the upper flange sealing assembly, the outlet pipe joint (10), and the pressure relief high-pressure hose (3) to form a circuit.

2. The hydraulic pressure testing device with flanged bend according to claim 1, characterized in that: The bend assembly includes a bend body (7), a lower flange (12) welded to one end of the bend body (7), and an upper flange (8) welded to the other end of the bend body (7).

3. The hydraulic pressure testing device with flanged bend according to claim 2, characterized in that: The lower flange sealing assembly includes a combined lower flange pressure ring (6) and a lower flange sealing plate (5). The middle part of the inner surface of the lower flange sealing plate (5) that mates with the lower flange (12) has an annular groove (13) larger than the inner diameter of the bend body (7). The combined lower flange pressure ring (6) is fitted onto the bend body (7). A sealing ring is placed in the annular groove (13) of the lower flange sealing plate (5). After the lower flange sealing plate (5) and the lower flange (12) are mated, the combined lower flange pressure ring (6) and the lower flange sealing plate (5) are locked together by bolts and nuts to seal the lower flange sealing plate (5) and the lower flange (12).

4. The hydraulic pressure testing device with flanged bend according to claim 3, characterized in that: The combined lower flange pressure ring (6) includes two half rings, which are combined into a whole ring from both sides of the bend body (7) in the form of pins.

5. The hydraulic pressure testing device with flanged bend according to claim 3 or 4, characterized in that: The combined lower flange pressure ring (6) includes two half rings. One half ring has a groove at one end and a protrusion at the other end. Correspondingly, the other half ring has a groove at one end and a protrusion at the other end. The groove and the protrusion are inserted and fitted together to form a complete ring.

6. The hydraulic pressure testing device with flanged bend according to claim 2, characterized in that: The upper flange sealing assembly includes an upper flange sealing plate (9). The middle part of the inner surface of the upper flange sealing plate (9) and the upper flange (8) is provided with an annular groove (13) larger than the inner diameter of the bend body (7). A sealing ring is placed in the annular groove (13) of the upper flange sealing plate (9). After the upper flange sealing plate (9) and the upper flange (8) are aligned, the upper flange sealing plate (9) and the upper flange (8) are locked together by bolts and nuts to seal and lock the upper flange sealing plate (9) and the upper flange (8).

7. The hydraulic pressure testing device with flanged bend according to claim 3, characterized in that: The lower flange sealing plate (5) is provided with two internal threaded holes, which are respectively connected to the water inlet pipe joint (11) and the first pressure gauge pipe joint (4). The first pressure gauge pipe joint (4) is then connected to the first pressure gauge (15) through the first pressure gauge pipe joint (16).

8. The hydraulic pressure testing device with flanged bend according to claim 6, characterized in that: The upper flange sealing plate (9) is provided with two internal threaded holes, which are respectively connected to the water pipe connector (10) and the second pressure gauge pipe connector (14). The second pressure gauge pipe connector (14) is then connected to the second pressure gauge (18) through the second pressure gauge pipe connector (17).

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