Boiler withstand voltage test device

Abstract

The utility model relates to a boiler pressure resistance test device, which comprises a cylindrical sealing seat, a sliding block, a pull claw and an end plate, wherein one side of the sealing seat is pressed on the front surface of a flange on a boiler; the sliding block can axially slide on the outer side of the sealing seat along the flange; the pull claw is rotationally connected to one end, close to the flange, of the sliding block; a sealing gasket is clamped between the sealing seat and the flange, the sealing seat is connected with a water injection pipe communicated with a flow channel in the center of the flange, the water injection pipe is connected with an electric pressure test pump, the pulling claw hooks the position, close to the edge, of the back face of the flange, the sliding blocks are evenly distributed in the circumferential direction of the sealing seat, and the other ends of the sliding blocks are fixedly connected with lead screws. The lead screw is in penetrating clearance fit with the end plate, the end, away from the sliding block, of the lead screw is in threaded connection with a driven gear, and the end plate is rotationally connected with a driving gear meshed with the driven gear. And the rotating disc is rotated to synchronously drive the three pull claws to move through the driving gear and the driven gear to clamp the sealing gasket, so that the connecting efficiency can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure resistance testing of pressure vessels, and particularly relates to a boiler pressure resistance testing device. Background Art

[0002] A boiler is a commonly used production device, which is used to heat water, provide hot water to hot water users, or heat water to boiling to generate steam and provide steam to steam users.

[0003] Before leaving the factory, a boiler needs to undergo a pressure resistance test to detect whether there are defects in the welded parts or connection parts of the boiler, and to ensure that there will be no leakage during the use of the boiler. At present, the pressure resistance test is carried out by injecting pressurized water into the boiler and then maintaining the pressure for the time required by the process. If the water pressure inside the boiler does not drop, it is considered that there is no leakage phenomenon and the pressure resistance test is qualified.

[0004] The process of the test is usually as follows: First, block all the pipes connecting the boiler to the outside world, leaving only one flange at the highest position. Then, inject water into the boiler through this flange with a water pipe. After the boiler is filled with water, block this flange with a flange blind plate with a threaded hole in the center. Connect the threaded hole in the center of this flange to the water outlet pipe of the electric pressure test pump through a high-pressure hose, and then start the electric pressure test pump to inject water into the boiler to increase the pressure inside the boiler. After reaching the pressure required by the process, stop the operation of the electric pressure test pump, observe the pressure gauge, and after maintaining the pressure for the time required by the process, if the pressure does not drop, the pressure resistance test is qualified.

[0005] Since when conducting the pressure resistance test, the flange blind plate needs to be connected to the flange on the boiler through multiple bolts passing through the flange blind plate and the flange on the boiler, it is time-consuming and laborious during the test. If the tightening force of each bolt is uneven, it is also easy to press the gasket between the flange blind plate and the flange on the boiler out of place, and it is very easy to cause leakage between the flange and the gasket when the pressure inside the boiler rises. In severe cases, a part of the gasket will emerge from the gap between the flange blind plate and the flange on the boiler under the action of the pressure, commonly known as "gasket oozing". Once the "gasket oozing" phenomenon occurs, it is necessary to release the pressure and loosen all the bolts and reconnect them. Therefore, this connection method is not only time-consuming and laborious, affecting the test efficiency of the pressure resistance test, but also the connection is unreliable and is greatly affected by the operator's experience. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a boiler pressure resistance testing device for solving the problem of low efficiency in the current pressure resistance test before the boiler leaves the factory.

[0007] To solve the above technical problem, the technical solution adopted by the utility model is:

[0008] The pressure test device for the boiler of the utility model includes a cylindrical sealing seat pressed against the front of the flange of the boiler on one side, a slider that can slide axially along the flange on the outside of the sealing seat, a claw rotatably connected to one end of the slider close to the flange, and an end plate arranged on the side of the sealing seat away from the flange; a sealing gasket is clamped between the sealing seat and the flange, a water injection pipe communicating with the flow channel at the center of the flange is connected to the sealing seat, the water injection pipe is connected with an electric pressure test pump, the claw is hooked on the part close to the edge on the back of the flange, at least two sliders are evenly distributed along the circumferential direction of the sealing seat, the other end of the slider is fixedly connected with a lead screw, the lead screw is in clearance fit with the through hole of the end plate, and a driven gear is threadedly connected to the end of the lead screw away from the slider, and a driving gear meshing with the driven gear is rotatably connected to the end plate.

[0009] Further, a turntable is rotatably connected to the outside of the end plate, the end plate and the turntable are both parallel to the front of the flange, the driving gear and the turntable are both coaxial with the flange, a driven striker is fixedly connected to the outside of the driving gear, and a driving striker is fixedly connected to the side of the turntable close to the driving gear, and the distance from the driving striker to the center of the turntable is equal to the distance from the driven striker to the center of the driving gear.

[0010] Further, the middle part of the side of the turntable close to the end plate is recessed, the end plate, the driving gear and the driven gear are all covered inside the turntable, and the turntable is in clearance fit with the end plate.

[0011] Further, a ring-shaped flange protrudes outwards from the edge of the outside of the turntable, and the edge of the flange is in a plum blossom shape.

[0012] Further, a gear cover is sleeved outside the driven gear, the gear cover is in clearance fit with the driven gear, a notch is arranged at the part of the gear cover close to the driving gear, and a hole for the lead screw to pass through is opened on the gear cover.

[0013] Further, a cylindrical piston is slidably connected to the part of the sealing seat close to the end plate, the piston is in sealing fit with the sealing seat, and the piston is fixedly connected to the end plate; a boss is arranged at the end of the piston away from the end plate, and the side of the piston away from the end plate is communicated with the flow channel of the flange.

[0014] Further, the diameter of the piston is larger than the diameter of the flow channel of the flange, a through hole for communicating the flow channel of the flange and the side of the piston close to the flange is arranged on the sealing seat, and the water injection pipe is communicated with the through hole.

[0015] Further, a valve is arranged on the water injection pipe, a pressure measuring pipe communicating with the flow channel of the flange is also connected to the sealing seat, and a pressure gauge is connected to the pressure measuring pipe.

[0016] The positive effects of the utility model are:

[0017] 1. The utility model includes a sealing seat, a slider, a claw, a lead screw, a driving gear, a driven gear, an end plate and a turntable. A sealing gasket is clamped between the sealing seat and the flange. A water injection pipe is connected to the sealing seat, and the water injection pipe is connected to an electric pressure test pump. Rotating the turntable can drive the three claws to move synchronously through the driving gear and the driven gear to clamp the sealing gasket, thus greatly improving the connection efficiency. Since the three claws move synchronously, the clamping force applied by the sealing seat and the flange on the sealing gasket is more uniform, thereby ensuring reliable sealing between the sealing seat and the flange and ensuring that there will be no "gasket leakage" phenomenon after the water pressure rises. The turntable relies on inertia, and the driving striker on the turntable impacts the driven striker on the driving gear to further apply a clamping force to the sealing gasket, making the operation more labor-saving.

[0018] 2. A piston is arranged in the sealing seat. One side of the piston close to the flange is communicated with the flow channel of the flange, so that a part of the pressure water enters the gap between the piston and the sealing seat. Since the cross-sectional area of the piston is larger than that of the flow channel, the resultant force of the water thrust received by the sealing seat is towards the flange direction, thereby further increasing the clamping force applied to the sealing gasket and making the sealing more tight. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the utility model;

[0020] Figure 2 is Figure 1 the sectional structural diagram of part A-A in

[0021] Figure 3 is Figure 1 the left view structural diagram of

[0022] Figure 4 is the connection structural diagram of the claw and the slider;

[0023] 1. Flange; 2. Claw; 3. Slider; 4. Handle; 5. Lead screw; 6. Gear cover; 7. Driven gear; 8. Driven striker; 9. Driving striker; 10. Turntable; 11. Rotating shaft; 12. End plate; 13. Driving gear; 14. Piston; 15. Sealing seat; 16. Boss; 17. Water inlet hole; 18. Through hole; 19. Sealing gasket; 20. Valve; 21. Pressure measuring pipe; 22. Pressure gauge; 23. Water injection pipe; 24. Spring. Detailed Implementation Manner

[0024] Embodiment 1

[0025] As Figures 1-3 shown, in the description of the utility model: The flange 1 is communicated with the inside of the boiler. The left side of the flange 1 is the back, and the right side is the front.

[0026] The utility model relates to a boiler pressure test device, which includes a cylindrical sealing seat 15 pressed against the front surface of a flange 1 on the left side of the boiler, three strip-shaped sliders 3 evenly distributed along the circumferential direction of the outer surface of the sealing seat 15, a claw 2 rotatably connected to the left end of the slider 3, and a circular end plate 12 arranged on the right side of the sealing seat 15. The end plate 12 is coaxial with the flange 1. The sealing seat 15 is provided with a dovetail groove at a position corresponding to each slider 13, and the dovetail groove is consistent with the axial direction of the flange 1. The part of each slider 13 corresponding to the dovetail groove has the same shape as the dovetail groove and is inserted into the dovetail groove, so as to realize the sliding connection between the slider 13 and the sealing seat. A U-shaped handle 4 is fixedly connected to the top of the sealing seat 15.

[0027] A circular sealing gasket 19 is clamped between the sealing seat 15 and the flange 1 of the utility model. A water injection pipe 23 communicated with the flow channel in the center of the flange 1 is connected to the sealing seat 15. The outer end of the water injection pipe 23 is connected with an electric pressure test pump through a quick joint. The claw 2 is hooked on the part near the edge of the back surface of the flange 1. A lead screw 5 is fixedly connected to the right end of each slider 3. Each lead screw 5 is in clearance fit with the end plate 12 through penetration. A driven gear 7 is threadedly connected to the end of each lead screw 5 far away from the slider 3. The driven gears 7 are all located on the right side of the end plate 12. A driving gear 13 meshing with each driven gear 7 is arranged on the right side of the end plate 12.

[0028] A gear cover 6 is sheathed outside the driven gear 7 of the utility model. The gear cover 6 and the driven gear 7 are in clearance fit. The gear cover 6 is provided with a notch at a position close to the driving gear 13. A hole for the lead screw 5 to pass through is opened on the gear cover 6. The gear cover 6 is used to limit the axial position of the driven gear 7.

[0029] A turntable 10 is rotatably connected to the right side of the driving gear 13 of the utility model. The driving gear 13 and the turntable 10 are both coaxial with the end plate 12. A rotating shaft 11 is fixedly connected to the center of the right side of the end plate 12. The driving gear 13 and the turntable 10 are both rotatably connected to the rotating shaft 11 through penetration. The turntable 10 is bowl-shaped. The end plate 12, the driving gear 13 and the driven gear 7 are all covered in the turntable 10. The turntable 10 and the end plate 12 are in clearance fit. The edge of the right side of the turntable 10 protrudes outwards to form an annular flange. The edge of the flange is plum blossom-shaped, which is convenient for the operator to grip. The right side of the turntable 10 is recessed inwards, and the edge of the recess is also plum blossom-shaped.

[0030] A driven striker 8 is fixedly connected to the right surface of the driving gear 13. A driving striker 9 is fixedly connected to the left surface of the turntable 10. The distance between the driving striker 9 and the center of the turntable 10 is equal to the distance between the driven striker 8 and the center of the driving gear 13.

[0031] The working process of the utility model is as follows:

[0032] 1. The hand-held handle 4 has the hooks at the left ends of the three pulling claws 2 facing outward. A sealing gasket 19 is placed between the flange 1 and the sealing seat 15, and the three pulling claws 2 are rotated so that the hooks at their left ends face inward.

[0033] 2. Rotate the turntable 10. The turntable 10 drives the driving gear 13 to rotate through the driving striker 9 and the driven striker 8, and then drives the driven gear 7 to rotate synchronously. Under the action of the driven gear 7 and the lead screw 5, the three pulling claws 2 are synchronously driven to move rightward through the three sliders 3, so that the three pulling claws 2 hook on the back of the flange 1, and the sealing seat 15 clamps the sealing gasket 19.

[0034] 3. Rotate the turntable 10 back and forth. The driving striker 9 driven by the turntable 10 impacts the driven striker 8 by relying on the inertia of the turntable 10, and the clamping force applied to the sealing gasket 19 is continuously increased through the lead screw 5, so as to make the seal more tight.

[0035] 4. Connect the electric pressure test pump to the quick connector at the end of the water injection pipe 23 through a high-pressure hose. Start the electric pressure test pump to inject water into the boiler and conduct a pressure resistance test on the boiler.

[0036] Since rotating the turntable 10 can synchronously drive the three pulling claws 2 to move and clamp the sealing gasket 19, the connection efficiency can be greatly improved. Since the three pulling claws 2 move synchronously, the clamping force of the sealing seat 15 and the flange 1 on the sealing gasket 19 is more uniform, thus ensuring a reliable seal between the sealing seat 15 and the flange 1 and ensuring that there will be no "gasket leakage" phenomenon after the water pressure rises.

[0037] The turntable 10 relies on inertia to impact the driven striker 8 through the driving striker 9, further applying a clamping force to the sealing gasket 19, which is more labor-saving during operation.

[0038] As Figure 4 shown, to prevent the pulling claw 2 from rotating randomly, a spring 24 can be added between the pulling claw 2 and the slider 3. The two ends of the spring 24 respectively abut against the pulling claw 32 and the slider 3, so as to keep the position of the pulling claw 2 by relying on the frictional forces between the pulling claw 2 and the slider 3 and the spring 24 respectively.

[0039] Embodiment 2

[0040] The difference between this embodiment and Embodiment 1 is that:

[0041] A cylindrical piston 14 is slidably connected to the part of the sealing seat 15 close to the end plate 12 of the present utility model. The piston 14 and the sealing seat 15 are hermetically matched through four sealing rings. The left end edge of the piston 14 is an annular boss 16, and the left side of the piston 14 is communicated with the flow channel of the flange 1.

[0042] The diameter of the piston 14 of the present utility model is greater than the diameter of the flow channel of the flange 1. A through hole 18 for connecting the flow channel of the flange 1 and the left side of the piston 14 is provided on the sealing seat 15. A water inlet hole 17 communicating with the through hole 18 is provided on the sealing seat 15 along the radial direction near the left end. The water injection pipe 23 is threadedly connected to the outer end of the water inlet hole 17.

[0043] When the electric pressure test pump injects water into the flow channel in the center of the flange 1 through the water injection pipe 23, part of the water will enter the gap between the left end of the piston 14 and the sealing seat 15 through the through hole 18, thereby applying a leftward thrust to the sealing seat 15. The diameter of the piston 14 is greater than the diameter of the flow channel in the center of the flange 2, so the cross-sectional area of the piston 14 is greater than the cross-sectional area of the flow channel. According to the relationship between pressure and force, F = PS, where P is the liquid pressure, F is the thrust, and S is the cross-sectional area. Since the flow channel in the center of the flange 1 and the left side of the piston 14 are connected, the liquid pressures in the flow channel and on the left side of the piston are equal. Since the cross-sectional area of the piston 14 is greater than the cross-sectional area of the flow channel of the flange 2, the liquid thrust received on the left side of the sealing seat 15 is less than the liquid thrust received on the right side of the sealing seat 15, so that the resultant force of the liquid thrust received by the sealing seat 15 is to the left, further increasing the clamping force applied to the sealing gasket 19 and making the seal more tight.

[0044] Embodiment 3

[0045] The difference between this embodiment and Embodiment 2 is as follows:

[0046] A valve 20 is provided on the water injection pipe 23 of the present utility model. A pressure measuring pipe 21 communicating with the flow channel of the flange 1 is further connected to the sealing seat 15, and a pressure gauge 22 is connected to the pressure measuring pipe 21.

[0047] During the pressure resistance test, after reaching the required test pressure, turn off the electric pressure test pump, and then close the valve 20. Even if the electric pressure test pump leaks due to aging or other reasons, the water injected into the boiler will not flow back to the electric pressure test pump through the water injection pipe 23.

[0048] The above-described embodiments are described in more detail and specifically, expressing the preferred embodiments of the present utility model, and are only used to illustrate the technical ideas and features of the present utility model. The purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. However, it is not limited to the present utility model only. The patent scope of the present utility model cannot be limited only by this embodiment. That is, any equivalent changes or modifications made in accordance with the spirit disclosed by the present utility model, for those researchers or technicians in the field, within the structure of the present utility model, local improvements within the system and changes and transformations between subsystems are still within the patent scope of the present utility model.

Claims

1. A boiler pressure test device, characterized in that, It includes a cylindrical sealing seat (15) pressing against the front of the flange (1) on one side of the boiler, a slider (3) that can slide axially along the flange (1) outside the sealing seat (15), a pulling claw (2) rotatably connected to one end of the slider (3) close to the flange (1), and an end plate (12) arranged on the side of the sealing seat (15) away from the flange (1); a sealing gasket (19) is clamped between the sealing seat (15) and the flange (1), a water injection pipe (23) communicating with the flow channel at the center of the flange (1) is connected to the sealing seat (15), the water injection pipe (23) is connected to an electric pressure test pump, the pulling claw (2) hooks on the part close to the edge on the back of the flange (1), at least two sliders (3) are evenly distributed along the circumferential direction of the sealing seat (15), the other end of the slider (3) is fixedly connected to a lead screw (5), the lead screw (5) is in clearance fit with the end plate (12) through penetration, and a driven gear (7) is threadedly connected to the end of the lead screw (5) away from the slider (3), and a driving gear (13) meshing with the driven gear (7) is rotatably connected to the end plate (12).

2. The boiler pressure test device according to claim 1, characterized in that, A turntable (10) is rotatably connected to the outside of the end plate (12), both the end plate (12) and the turntable (10) are parallel to the front of the flange (1), both the driving gear (13) and the turntable (10) are coaxial with the flange (1), a driven collision block (8) is fixedly connected to the outside of the driving gear (13), a driving collision block (9) is fixedly connected to the side of the turntable (10) close to the driving gear (13), and the distance from the driving collision block (9) to the center of the turntable (10) is equal to the distance from the driven collision block (8) to the center of the driving gear (13).

3. The boiler pressure test device according to claim 2, wherein, The middle part of the side of the turntable (10) close to the end plate (12) is recessed, the end plate (12), the driving gear (13) and the driven gear (7) are all covered inside the turntable (10), and the turntable (10) is in clearance fit with the end plate (12).

4. A boiler pressure test device according to claim 3, characterized in that, The edge of the outside of the turntable (10) protrudes outwards to form an annular flange, and the edge of the flange is in a plum blossom shape.

5. A boiler pressure test device according to claim 1, characterized in that, A gear cover (6) is covered outside the driven gear (7), the gear cover (6) is in clearance fit with the driven gear (7), the gear cover (6) is provided with a notch at the part close to the driving gear (13), and a hole for the lead screw (5) to pass through is opened on the gear cover (6).

6. The boiler pressure test device according to claim 1, characterized in that, A cylindrical piston (14) is slidably connected to the part of the sealing seat (15) close to the end plate (12), the piston (14) is in sealing fit with the sealing seat (15), and the piston (14) is fixedly connected to the end plate (12); a convex platform (16) is provided at the end of the piston (14) away from the end plate (12), and the side of the piston (14) away from the end plate (12) communicates with the flow channel of the flange (1).

7. The boiler pressure test device according to claim 6, characterized in that, The diameter of the piston (14) is larger than the diameter of the flow channel of the flange (1), a through hole (18) communicating the flow channel of the flange (1) and the side of the piston (14) close to the flange (1) is provided on the sealing seat (15), and the water injection pipe (23) communicates with the through hole (18).

8. A boiler pressure test device according to claim 1, characterized in that, A valve (20) is provided on the water injection pipe (23). A pressure measuring pipe (21) communicating with the flow channel of the flange (1) is further connected to the sealing seat (15), and a pressure gauge (22) is connected to the pressure measuring pipe (21).

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