Sealing performance detection device for transformer insulating oil delivery pipeline

Abstract

The utility model discloses a leakproofness detection device for a transformer insulating oil delivery pipeline, which comprises a pressure detection unit and an oil delivery pipeline used for installing the pressure detection unit, one end of the oil delivery pipeline is provided with a fluorescent agent injection port, and the top of the oil delivery pipeline is fixedly communicated with two groups of connecting pipes. The top ends of the two sets of connecting pipes are fixedly communicated with a U-shaped pipe, the pressure detection unit is communicated with the U-shaped pipe, the top of the oil conveying pipeline is communicated with the U-shaped pipe, a positioning detection assembly is integrated, rapid and accurate positioning of the leakage position is achieved, and when leakage happens to the oil conveying pipeline, a fluorescent agent seeps to the leakage point along with insulating oil; the ultraviolet lamp moves and irradiates along the oil conveying pipeline, the leakage position can be visually located by detecting the fluorescence reaction, the problem that in the prior art, detection only depends on the pressure attenuation rate, but the leakage point cannot be rapidly located is solved, and the detection efficiency and accuracy are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer operation and maintenance equipment technical field, concretely is a kind of sealing detection device of transformer insulating oil delivery pipeline. BACKGROUND

[0002] In power system, as one of core equipment, the safe and stable operation of transformer is directly related to the reliability of power grid, and as important insulation and cooling medium inside transformer, the sealing of insulating oil delivery pipeline has decisive influence on the performance and life of transformer, once the leakage of delivery pipeline occurs, not only will lead to the loss of insulating oil, cause the internal insulation performance of transformer to drop, local overheating and even short-circuit fault, but also can cause environmental pollution and security risk, in the process of transformer installation and operation, the sealing detection of insulating oil delivery pipeline is the key link to ensure equipment quality.

[0003] At present, nitrogen pressure method is generally used to detect the sealing of insulating oil delivery pipeline in industry, nitrogen pressure method can only determine whether pipeline exists leakage, but cannot quickly locate the specific position of leakage point. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of sealing detection device of transformer insulating oil delivery pipeline, to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of sealing detection device of transformer insulating oil delivery pipeline, comprising: pressure detection unit, and the oil delivery pipeline for installing pressure detection unit, one end of the oil delivery pipeline is provided with fluorescent agent injection port, the top of the oil delivery pipeline is fixedly connected with two groups of connecting pipes, the top of two groups of connecting pipes is fixedly connected with U-shaped pipe, the pressure detection unit is communicated with U-shaped pipe, the outer wall of both ends of the U-shaped pipe is respectively fixedly connected with two groups of mounting brackets, the mounting bracket is provided with positioning detection assembly for quickly positioning the leakage position of oil delivery pipeline.

[0007] Preferably, the positioning detection assembly includes ball screw, the both ends of the ball screw are respectively rotatably installed on the opposite side wall of two groups of mounting brackets, one end of the ball screw penetrates one group of mounting brackets and is connected with driving motor, the outer wall of the ball screw is threadedly connected with moving block, the top of the moving block is connected with fixed frame, the bottom of the fixed frame is fixedly connected with ultraviolet lamp.

[0008] Preferably, the guiding rod is fixedly connected to opposite side walls of the other two groups of mounting frames, a sliding block is slidably connected to the outer wall of the guiding rod, and the end of the fixed frame away from the moving block is connected to the top of the sliding block.

[0009] Preferably, the sliding block is fixedly connected to the top and the bottom of the moving block, and the two ends of the fixed frame are fixedly connected to the positioning seats through fixing screws.

[0010] Preferably, the driving motor is fixedly installed on the side wall of one group of mounting frames, and one end of the output shaft of the driving motor is fixedly connected to one end of the ball screw through a shaft coupling.

[0011] Preferably, the pressure detection unit comprises a nitrogen storage tank, a through pipe is fixedly and communicatively connected to the top end of the nitrogen storage tank, one end of the through pipe is fixedly and communicatively connected to the U-shaped pipe, and a gas booster pump is conductively connected to the outer wall of the through pipe.

[0012] Preferably, the utility model also comprises two groups of one-way valves, the two groups of one-way valves are conductively connected to the outer wall of the U-shaped pipe, and pressure gauges are conductively connected to the U-shaped pipe below the one-way valves.

[0013] Preferably, the utility model also comprises two groups of stop valves, and the two groups of stop valves are conductively connected to the two ends of the oil pipeline.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1. The utility model realizes rapid and accurate positioning of the leakage position by connecting the U-shaped pipe to the top of the oil pipeline and integrating the positioning detection assembly, when the oil pipeline leaks, the fluorescent agent seeps out of the insulating oil to the leakage point, the ultraviolet lamp moves along the oil pipeline to irradiate, and the leakage position can be directly positioned by detecting the fluorescent reaction, thereby solving the problem that the leakage point cannot be rapidly positioned in the prior art by only relying on pressure decay rate detection, and the detection efficiency and accuracy are significantly improved.

[0016] 2. The pressure detection unit and the positioning detection assembly work cooperatively to form a double detection mechanism of pressure monitoring and leakage positioning, the pressure detection unit detects pressure changes by nitrogen pressure charging to preliminarily judge whether the pipeline leaks, and the positioning detection assembly further locks the leakage position, so that the detection is comprehensive and the limitation of single detection is avoided, and the reliability and practicality of detection are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the utility model;

[0018] Figure 2 It is a structural schematic view of the shaft side of the utility model.

[0019] Figure 3 It is a structural schematic view of the oil pipeline and the pressure detection unit of the utility model.

[0020] Figure 4 It is a structural schematic view of the positioning detection assembly.

[0021] In the figure: 1, pressure detection unit; 101, nitrogen storage tank; 102, through pipe; 103, gas booster pump; 104, check valve; 105, pressure gauge; 2, oil pipeline; 3, connecting pipe; 4, U-shaped pipe; 5, mounting bracket; 6, positioning detection assembly; 601, ball screw; 602, drive motor; 603, moving block; 604, fixed bracket; 605, ultraviolet lamp; 606, guide rod; 607, sliding block; 7, positioning seat. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] Please refer to Figures 1-4 The utility model provides a technical scheme:

[0024] A kind of sealing detection device of transformer insulating oil delivery pipeline, comprising: pressure detection unit 1, and the oil pipeline 2 for installing pressure detection unit 1, one end of oil pipeline 2 is provided with fluorescent agent injection port, for injecting fluorescent agent into pipeline before detection, to subsequent leakage positioning;

[0025] The top of oil pipeline 2 is fixedly connected with two groups of connecting pipes 3, the top of the two groups of connecting pipes 3 is fixedly connected with U-shaped pipe 4, pressure detection unit 1 is communicated with U-shaped pipe 4, the outer wall of the two ends of U-shaped pipe 4 is fixedly connected with two groups of mounting brackets 5, mounting bracket 5 adopts aluminum alloy material, and has light weight and high rigidity, adapts to complex installation environment on site, positioning detection assembly 6 for quickly positioning the leakage position of oil pipeline 2 is arranged on mounting bracket 5;

[0026] The positioning detection assembly 6 comprises a ball screw 601, both ends of the ball screw 601 are rotatably installed on the opposite side walls of the two groups of mounting frames 5 respectively, one end of the ball screw 601 penetrates through one group of mounting frames 5 and is connected with a driving motor 602, a moving block 603 is threadedly connected to the outer wall of the ball screw 601, a fixed frame 604 is connected to the top of the moving block 603, and a ultraviolet lamp 605 is fixedly connected to the bottom of the fixed frame 604; the cooperation of the ball screw 601 and the driving motor 602 realizes the linear movement of the ultraviolet lamp 605, the high-precision transmission characteristics ensure the stability of the scanning process, the wavelength of the ultraviolet lamp 605 matches the fluorescent agent, can efficiently excite the fluorescent reaction at the leakage point, and improves the positioning sensitivity; the ultraviolet lamp 605 (model: HUV-365NM-10W) has an emission wavelength of 365 nm, which is highly matched with the excitation wavelength of common fluorescent agents (such as rhodamine B);

[0027] The guiding rod 606 is fixedly connected to the opposite side walls of the other two groups of mounting frames 5 respectively, a sliding block 607 is slidingly connected to the outer wall of the guiding rod 606, one end of the fixed frame 604 away from the moving block 603 is connected to the top of the sliding block 607, the sliding cooperation of the guiding rod 606 and the sliding block 607 provides transverse support for the fixed frame 604, prevents the ultraviolet lamp 605 from deviating due to the transmission gap of the ball screw 601, and further improves the positioning accuracy; the surface of the guiding rod 606 is chrome-plated to reduce the friction coefficient and ensure smooth sliding of the sliding block 607; the double-track design effectively disperses the load and avoids mechanical wear caused by unilateral stress, prolonging the service life of the device;

[0028] The top and bottom of the sliding block 607 are fixedly connected with positioning seats 7, and both ends of the fixed frame 604 are fixedly connected with the positioning seats 7 through fixed screws;

[0029] The driving motor 602 is fixedly installed on one side wall of one group of mounting frames 5, one end of the output shaft of the driving motor 602 is fixedly connected with one end of the ball screw 601 through a shaft coupling, the driving motor 602 adopts servo control and can accurately adjust the moving speed, the driving motor 602 has an IP55 protection level, which prevents oil stains and dust from invading, the shaft coupling adopts an elastic plum blossom structure, compensates for installation errors and absorbs impact vibration, and the driving motor 602 is a Panasonic MINAS A6 series servo motor;

[0030] The pressure detection unit 1 comprises a nitrogen storage tank 101, the top end of the nitrogen storage tank 101 is fixedly connected with a through pipe 102, one end of the through pipe 102 is fixedly connected with the U-shaped pipe 4, a gas booster pump 103 is connected on the outer wall of the through pipe 102 in a lead-through mode, the gas booster pump 103 is a Haskel DGF series pneumatic booster pump (model: DGF-10 / 100), the capacity of the nitrogen storage tank 101 can be adjusted according to the length of the pipeline (for example, 10-50L), the gas booster pump 103 can increase the pressure of the nitrogen to 0.5-1.0MPa, which meets different detection standards, the inert property of the nitrogen avoids oxidation reaction with the insulating oil, improves the safety of detection, and the gas booster pump 103 is provided with a PID pressure closed-loop control;

[0031] The pressure detection unit 1 further comprises two groups of one-way valves 104, the two groups of one-way valves 104 are both connected on the outer wall of the U-shaped pipe 4 in a lead-through mode, the U-shaped pipe 4 is located below the one-way valves 104 and is connected with a pressure gauge 105 in a lead-through mode, the one-way valves 104 prevent backflow of the nitrogen, and improve the accuracy of pressure detection, the pressure gauge 105 has an accuracy of ±0.1kPa, and can display the pressure difference between the two ends of the oil conveying pipeline in real time, the one-way valves 104 adopt a spring-loaded structure, and have an opening and closing pressure of 0.05MPa, so that the gas flows in one direction during the detection process, and the pressure gauge 105 is a digital instrument and supports RS485 communication, so that data can be transmitted to a control terminal in real time;

[0032] The pressure detection unit 1 further comprises two groups of stop valves, the two groups of stop valves are connected to the two ends of the oil conveying pipeline 2 in a lead-through mode, the stop valves can improve the pressure stability of the oil conveying pipeline 2, the stop valves can completely cut off the connection between the oil conveying pipeline 2 and upstream and downstream equipment, so that the detection area is independent, after the detection area is isolated, the pressure charging detection will not cause pressure impact on the upstream and downstream equipment (such as a transformer and an oil pump), and the service life of the equipment is prolonged, and if the oil conveying pipeline 2 is long or has many branches, the segmented detection can be realized by closing some stop valves.

[0033] Working principle:

[0034] Detection preparation stage: the fluorescent agent solution is injected into the oil conveying pipeline 2 through the fluorescent agent injection port, so that the fluorescent agent is uniformly distributed in the pipeline, the gas booster pump 103 is started, and the nitrogen in the nitrogen storage tank 101 is filled into the U-shaped pipe 4 until the pressure gauge 105 displays the set pressure, and the backflow of the nitrogen is prevented through the one-way valves 104, and then the pressure maintaining stage is entered;

[0035] Pressure detection stage: the pressure detection unit 1 monitors the pressure change of the two ends of the oil conveying pipeline 2 in real time, if there is leakage in the pipeline, the pressure in the oil conveying pipeline 2 will gradually decrease, and if the pressure difference displayed by the pressure gauge 105 exceeds a threshold value (such as 0.05kPa / min), it is determined that there is leakage in the pipeline;

[0036] Leakage positioning stage: the driving motor 602 drives the ball screw 601 to rotate, drives the moving block 603 and the fixed frame 604 to move along the axial direction of the oil pipeline 2, and the ultraviolet lamp 605 scans the outer wall of the oil pipeline 2, when scanning to the region corresponding to the leakage point, the fluorescent agent is excited to generate fluorescence reaction, the fluorescence signal is captured through visual observation, and the leakage position is determined.

[0037] Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing performance testing device for a transformer insulating oil conveying pipeline, characterized in that, include: Pressure detection unit (1), and Oil pipeline (2) for installing pressure detection unit (1); One end of the oil pipeline (2) is provided with a fluorescent agent injection port. The top of the oil pipeline (2) is fixedly connected to two sets of connecting pipes (3). The top ends of the two sets of connecting pipes (3) are fixedly connected to a U-shaped pipe (4). The pressure detection unit (1) is connected to the U-shaped pipe (4). Two sets of mounting brackets (5) are fixedly connected to the outer walls of both ends of the U-shaped pipe (4). The mounting brackets (5) are provided with a positioning detection component (6) for locating the leakage location of the oil pipeline (2).

2. The sealing performance testing device for a transformer insulating oil conveying pipeline according to claim 1, characterized in that: The positioning detection component (6) includes a ball screw (601), with both ends of the ball screw (601) rotatably mounted on opposite side walls of two sets of mounting brackets (5). One end of the ball screw (601) passes through one set of mounting brackets (5) and is connected to a drive motor (602). A moving block (603) is threaded onto the outer wall of the ball screw (601). A fixed frame (604) is connected to the top of the moving block (603), and an ultraviolet lamp (605) is fixedly connected to the bottom of the fixed frame (604).

3. The sealing performance testing device for a transformer insulating oil conveying pipeline according to claim 2, characterized in that: It also includes a guide rod (606), the two ends of which are fixedly connected to the opposite side walls of the other two sets of mounting brackets (5). A slider (607) is slidably connected to the outer wall of the guide rod (606), and the end of the fixed bracket (604) away from the moving block (603) is connected to the top of the slider (607).

4. The sealing performance testing device for a transformer insulating oil conveying pipeline according to claim 3, characterized in that: The top and bottom of the slider (607) and the moving block (603) are fixedly connected with positioning seats (7), and the two ends of the fixing frame (604) are respectively bolted to the positioning seats (7) by fixing screws.

5. The sealing performance testing device for a transformer insulating oil conveying pipeline according to claim 4, characterized in that: The drive motor (602) is fixedly installed on one side wall of one of the mounting brackets (5), and one end of the output shaft of the drive motor (602) is fixedly connected to one end of the ball screw (601) through a coupling.

6. The sealing performance testing device for a transformer insulating oil conveying pipeline according to claim 1, characterized in that: The pressure detection unit (1) includes a nitrogen storage tank (101), the top of which is fixedly connected to a pipe (102), one end of which is fixedly connected to a U-shaped pipe (4), and a gas booster pump (103) is conductively connected to the outer wall of the pipe (102).

7. The sealing performance testing device for a transformer insulating oil conveying pipeline according to claim 6, characterized in that: It also includes two sets of one-way valves (104), both sets of one-way valves (104) are connected to the outer wall of the U-tube (4), and the U-tube (4) is connected to pressure gauges (105) respectively below the one-way valves (104).

8. The sealing performance testing device for a transformer insulating oil conveying pipeline according to claim 1, characterized in that: It also includes two sets of shut-off valves, which are respectively connected to both ends of the oil pipeline (2).

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