Pressure relief valve calibrator for transformer

Abstract

The utility model discloses a pressure relief valve calibrator for a transformer, and relates to the technical field of transformers, in particular to the pressure relief valve calibrator for the transformer, which comprises a base cylinder, a butt joint cylinder and a U-shaped limiting plate, a gear concentric with the output end of the servo motor is installed at the output end of the servo motor and meshed with a rack rod through teeth, a guide ring is installed on the side face, away from the teeth, of the rack rod, a guide rod is installed on the inner wall of the base cylinder, and a supporting rod is installed at the top of the rack rod. The pressure relief valve calibrator for the transformer has the effects of conveniently limiting the position of the pressure relief valve and preventing the position of the pressure relief valve from deviating during calibration, through cooperation of a gear and a rack rod, a plurality of arc-shaped limiting blocks can conveniently and synchronously move to limit the position of the pressure relief valve, the stability of limiting the position of the pressure relief valve is improved, and the calibration accuracy of the pressure relief valve is improved. And the purpose of improving the practicability is achieved.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to a transformer pressure relief valve calibrator. Background Technology

[0002] Pressure relief valves are crucial protective devices for power equipment such as oil-immersed transformers. When a short circuit or other fault occurs inside the transformer, the internal pressure of the oil tank rises sharply. The pressure relief valve automatically and rapidly opens and sprays oil within a very short time to release the fault pressure inside the tank, protecting it from damage due to excessive internal pressure. After releasing the pressure, the valve automatically and reliably closes when the internal pressure drops to the closing pressure value, ensuring that the pressure inside the tank is higher than the external atmospheric pressure. This prevents the entry of external air, moisture, and other impurities, avoiding contamination of the transformer oil.

[0003] Existing transformer pressure relief valve calibrators have poor stability in limiting the position of the pressure relief valve during calibration, which affects the calibration of the pressure relief valve. In addition, existing transformer pressure relief valve calibrators have poor sealing performance in the connection between the air pump and the pressure relief valve. The present invention provides a transformer pressure relief valve calibrator that solves the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a pressure relief valve calibrator for transformers, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a pressure relief valve calibrator for transformers, comprising a base cylinder, a docking cylinder, and a U-shaped limiting plate. A servo motor is installed on the inner bottom wall of the base cylinder. A gear with the same center as the output shaft of the servo motor is installed at the output end of the servo motor. The gear meshes with a rack rod. A guide ring is installed on the side of the rack rod away from the teeth. A guide rod is installed on the inner wall of the base cylinder. A support rod is installed on the top of the rack rod. An arc-shaped limiting block is installed at the end of the support rod. A frustum is installed on the top of the base cylinder. An air pump is installed on the outer surface of the base cylinder. A delivery hose is provided at the output end of the air pump. A pressure gauge is provided on the outer surface of the delivery hose. An internal threaded ring is installed at the end of the delivery hose. A first sealing ring is provided inside the internal threaded ring. An external threaded ring is installed on one side of the docking cylinder. A second sealing ring is installed inside the docking cylinder. A positioning block is installed on the inner wall of the U-shaped limiting plate. Threaded holes are opened on the outer surfaces of both the docking cylinder and the U-shaped limiting plate. Bolts are provided inside the threaded holes.

[0008] Optionally, the base tube, gear, and placement truncated cone are all at the same center, and the guide rod passes through the guide ring.

[0009] Optionally, a rubber pad is installed on the inner surface of the arc-shaped limiting block. There are several arc-shaped limiting blocks, which are arranged in a circular array. The position of the arc-shaped limiting blocks is higher than the position where the truncated cone is placed.

[0010] Optionally, the internal threaded ring and the external threaded ring are threaded together, and the end of the external threaded ring away from the mating cylinder abuts against the first sealing ring.

[0011] Optionally, the outer surface of the docking cylinder is provided with a positioning groove that matches the positioning block, and the end of the positioning block is inserted into the inside of the positioning groove.

[0012] Optionally, the U-shaped limiting plate is sleeved on the outside of the docking cylinder, and the cross-section of the U-shaped limiting plate is arc-shaped, with the U-shaped limiting plate and the docking cylinder having the same center.

[0013] This utility model provides a pressure relief valve calibrator for transformers, which has the following advantages:

[0014] 1. This transformer pressure relief valve calibrator, through the arrangement of gears, racks, guide rings, guide rods, support rods, arc-shaped limit blocks, and a placement truncated cone, enables the calibrator to conveniently limit the position of the pressure relief valve, preventing positional deviation during calibration. The cooperation of gears and racks facilitates the synchronous movement of multiple arc-shaped limit blocks to restrict the position of the pressure relief valve, improving the stability of the pressure relief valve position restriction and thus enhancing its practicality.

[0015] 2. This transformer pressure relief valve calibrator, through the arrangement of an internal threaded ring, a first sealing ring, an external threaded ring, a second sealing ring, a positioning block, and bolts, improves the sealing performance of the connection between the air pump and the pressure relief valve. Pressure is measured by a pressure gauge, and the U-shaped limit plate and positioning block facilitate the connection between the pressure relief valve and the docking cylinder. The second sealing ring enhances the sealing performance at the connection between the pressure relief valve and the docking cylinder. The docking cylinder serves as the connection between the air pump and the pressure relief valve. The cooperation of the internal and external threaded rings allows for easy replacement of docking cylinders of different specifications to connect to pressure relief valves of different specifications, thus expanding its applicability and achieving the goal of improving practicality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a top view sectional diagram of the present invention.

[0018] Figure 3 This is a structural schematic diagram of the present invention in frontal cross-section;

[0019] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A;

[0020] Figure 5 This is a schematic diagram of the structure of this utility model in partial cross-section from a top view;

[0021] Figure 6 This is a side view sectional diagram of the present invention.

[0022] In the diagram: 1. Base cylinder; 2. Connecting cylinder; 3. U-shaped limiting plate; 4. Servo motor; 5. Gear; 6. Rack rod; 7. Guide ring; 8. Guide rod; 9. Support rod; 10. Arc-shaped limiting block; 11. Placement truncated cone; 12. Air pump; 13. Delivery hose; 14. Pressure gauge; 15. Internal threaded ring; 16. First sealing ring; 17. External threaded ring; 18. Second sealing ring; 19. Positioning block; 20. Bolt; 21. Rubber pad. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1

[0025] Please see Figures 1 to 6 This utility model provides a technical solution: a pressure relief valve calibrator for transformers, comprising a base cylinder 1, a docking cylinder 2, and a U-shaped limiting plate 3. A servo motor 4 is installed on the inner bottom wall of the base cylinder 1. A gear 5 with the same center as the output shaft of the servo motor 4 is installed at the output end of the servo motor 4. The gear 5 meshes with a rack rod 6 through its teeth. A guide ring 7 is installed on the side of the rack rod 6 away from the teeth. A guide rod 8 is installed on the inner wall of the base cylinder 1. A support rod 9 is installed on the top of the rack rod 6. An arc-shaped limiting block 10 is installed at the end of the support rod 9. A placement device is installed on the top of the base cylinder 1. The truncated cone 11 has an air pump 12 mounted on its outer surface. The output end of the air pump 12 is provided with a delivery hose 13. The outer surface of the delivery hose 13 is provided with a pressure gauge 14. The end of the delivery hose 13 is provided with an internal threaded ring 15. The inside of the internal threaded ring 15 is provided with a first sealing ring 16. One side of the docking cylinder 2 is provided with an external threaded ring 17. The inside of the docking cylinder 2 is provided with a second sealing ring 18. The inner wall of the U-shaped limiting plate 3 is provided with a positioning block 19. The outer surfaces of both the docking cylinder 2 and the U-shaped limiting plate 3 are provided with threaded holes. Bolts 20 are provided inside the threaded holes.

[0026] Specifically, the guide rod 8 and the guide ring 7 work together to facilitate the guiding movement of the arc-shaped limiting block 10.

[0027] Please see Figures 1 to 5 The base cylinder 1, gear 5 and the placement truncated cone 11 are all at the same center, and the guide rod 8 passes through the guide ring 7.

[0028] Specifically, the multiple arc-shaped limit blocks 10 are designed to facilitate clamping and limiting the position of the pressure relief valve, while the rubber pad 21 is designed to prevent damage to the pressure relief valve during clamping.

[0029] Please see Figures 1 to 5 A rubber pad 21 is installed on the inner surface of the arc-shaped limiting block 10. There are several arc-shaped limiting blocks 10, which are arranged in a circular array. The position of the arc-shaped limiting block 10 is higher than the position where the truncated cone 11 is placed.

[0030] Specifically, the mating of the internal threaded ring 15 and the external threaded ring 17 facilitates the replacement of different specifications of the docking cylinder 2. The docking cylinder 2 serves as a transfer connection between the air pump 12 and the pressure relief valve, and the first sealing ring 16 improves the sealing performance of the connection between the docking cylinder 2 and the air pump 12.

[0031] Please see Figures 1 to 4 The internal threaded ring 15 and the external threaded ring 17 are threadedly connected, and the end of the external threaded ring 17 away from the mating cylinder 2 abuts against the first sealing ring 16.

[0032] Specifically, the positioning block 19 and the interior of the positioning groove facilitate the positioning of the U-shaped limiting plate 3. The U-shaped limiting plate 3 facilitates the connection between the docking cylinder 2 and the pressure relief valve.

[0033] Please see Figures 3 to 4 The outer surface of the docking cylinder 2 is provided with a positioning groove that is adapted to the positioning block 19, and the end of the positioning block 19 is inserted into the inside of the positioning groove.

[0034] Specifically, the U-shaped limiting plate 3 is designed to be easily fitted onto the outside of the docking cylinder 2, thereby connecting the docking cylinder 2 with the pressure relief valve.

[0035] Please see Figures 1 to 6 The U-shaped limiting plate 3 is sleeved on the outside of the docking cylinder 2, and the cross section of the U-shaped limiting plate 3 is arc-shaped, with the U-shaped limiting plate 3 and the docking cylinder 2 having the same center.

[0036] During use, when calibrating and testing the pressure relief valve, to restrict the position of the pressure relief valve, place the pressure relief valve on the placement platform 11. Then, the servo motor 4 drives the gear 5 to rotate. The gear 5 meshes with multiple racks 6, causing the racks 6 to move the guide ring 7, support rod 9, and arc-shaped limit blocks 10. This causes the guide ring 7 to slide along the length of the guide rod 8, and the multiple arc-shaped limit blocks 10 to move synchronously towards the center of the base cylinder 1, clamping the pressure relief valve. The rubber pad 21 is set to prevent damage to the pressure relief valve during clamping and to prevent the pressure relief valve from shifting its position during calibration. Replace the docking cylinder 2 with a matching one according to the size of the pressure relief valve. When replacing, rotate the docking cylinder 2 to align the internal threaded ring 15 with the external threaded ring 17. The internal threaded ring 15 abuts against the first sealing ring 16. Raise the docking cylinder 2 and the air pump 12 section. To ensure a tight seal at the connection, when connecting the docking cylinder 2 to the pressure relief valve, the docking cylinder 2 is fitted onto the end of the pressure relief valve, causing the pressure relief valve to abut against the second sealing ring 18. Then, the U-shaped limiting plate 3 is fitted onto the docking cylinder 2, allowing the end of the positioning block 19 to be inserted into the positioning groove until the end of the U-shaped limiting plate 3 abuts against the pressure relief valve. When the threaded hole on the U-shaped limiting plate 3 aligns with the threaded hole on the docking cylinder 2, the bolt 20 is tightened to secure the threaded hole, ensuring a tight connection between the U-shaped limiting plate 3 and the docking cylinder 2. The second sealing ring 18 improves the sealing at the connection between the docking cylinder 2 and the pressure relief valve. The docking cylinder 2 acts as a transfer mechanism, improving the sealing between the air pump 12 and the pressure relief valve. Gas is delivered through the delivery hose 13, and the pressure is checked using the pressure gauge 14 for easy calibration and improved practicality.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A transformer pressure relief valve calibrator, comprising a base cylinder, a connecting cylinder, and a U-shaped limiting plate, characterized in that: A servo motor is installed on the inner bottom wall of the base cylinder. A gear with the same center as the output shaft of the servo motor is installed on the output end of the servo motor. The gear meshes with a rack rod. A guide ring is installed on the side of the rack rod away from the teeth. A guide rod is installed on the inner wall of the base cylinder. A support rod is installed on the top of the rack rod. An arc-shaped limiting block is installed at the end of the support rod. A frustum is installed on the top of the base cylinder. An air pump is installed on the outer surface of the base cylinder. A delivery hose is provided at the output end of the air pump. A pressure gauge is provided on the outer surface of the delivery hose. An internal threaded ring is installed at the end of the delivery hose. A first sealing ring is provided inside the internal threaded ring. An external threaded ring is installed on one side of the docking cylinder. A second sealing ring is installed inside the docking cylinder. A positioning block is installed on the inner wall of the U-shaped limiting plate. Threaded holes are opened on the outer surfaces of both the docking cylinder and the U-shaped limiting plate. Bolts are installed inside the threaded holes.

2. The transformer pressure relief valve calibrator according to claim 1, characterized in that: The base cylinder, gear, and placement truncated cone all share the same center, and the guide rod passes through the guide ring.

3. The transformer pressure relief valve calibrator according to claim 1, characterized in that: Rubber pads are installed on the inner surface of the arc-shaped limiting block. There are several arc-shaped limiting blocks, which are arranged in a circular array. The position of the arc-shaped limiting blocks is higher than the position where the truncated cone is placed.

4. The transformer pressure relief valve calibrator according to claim 1, characterized in that: The internal threaded ring and the external threaded ring are threaded together, and the end of the external threaded ring away from the mating cylinder abuts against the first sealing ring.

5. The transformer pressure relief valve calibrator according to claim 1, characterized in that: The outer surface of the docking cylinder is provided with a positioning groove that matches the positioning block, and the end of the positioning block is inserted into the inside of the positioning groove.

6. The transformer pressure relief valve calibrator according to claim 1, characterized in that: The U-shaped limiting plate is sleeved on the outside of the docking cylinder, and the cross-section of the U-shaped limiting plate is arc-shaped, with the U-shaped limiting plate and the docking cylinder having the same center.

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