Casing oil supplementing device

Abstract

The invention relates to the technical field of transformer maintenance equipment, in particular to a sleeve oil recharging device which comprises an oil injection pipe, an oil pipe connector, an oil pump, a control box and an ultrasonic sensor, an oil injection nozzle is arranged on a transformer sleeve, and the oil pipe connector is arranged in the transformer sleeve through the oil injection nozzle. The ultrasonic sensor is installed on the top of the transformer bushing and extends into the transformer bushing, and the ultrasonic sensor and the oil pump are both electrically connected with the control box. Compared with the prior art, the casing oil recharging device adopts the oil pump to replace a needle tube for oil injection, the oil recharging efficiency is improved, meanwhile, the ultrasonic sensor is adopted for detecting the oil level in real time, oil injection is stopped immediately after the oil injection amount is controlled to reach the standard, the oil level control precision is improved, and the oil recharging efficiency is improved. And 2, the oil injection quantity is controlled, and oil injection overflow caused by personnel negligence is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer maintenance equipment, and in particular to a bushing oil replenishing device. Background Art

[0002] At present, the common way to refill oil in transformer bushings is with a syringe. Taking an ordinary syringe as an example, its volume is about 150mL, while the amount of oil refilled in a single time may be more than 1000mL. Therefore, multiple injections are required, resulting in a large workload and low efficiency in the refilling operation.

[0003] Moreover, when adding oil, the oil level can only be identified and judged by the naked eye through the observation window, making it difficult to control the oil level. In addition, due to the property of transformer oil that it expands when heated and contracts when cooled, inaccurate oil level may cause oil spraying from the bushing during high load in summer and oil shortage in the bushing during low load in winter, resulting in unplanned power outages of the transformer and affecting power safety. Summary of the Invention

[0004] In order to effectively improve the oil replenishment efficiency and the oil replenishment oil level accuracy, the present invention provides a casing oil replenishment device.

[0005] The present invention provides a casing oil replenishing device that adopts the following technical solutions: A casing oil replenishing device includes an oil filling pipe, an oil pipe joint, an oil pump, a control box and an ultrasonic sensor. The transformer casing is provided with an oil filling nozzle, the oil pipe joint is placed in the transformer casing through the oil filling nozzle, the ultrasonic sensor is installed on the top of the transformer casing and extends into the transformer casing, and the ultrasonic sensor and the oil pump are both electrically connected to the control box.

[0006] By adopting the above technical solution, the device has two oil filling modes: one is the quantitative oil filling mode, that is, oil is filled according to the oil filling amount input on the control box; the other is the in-place oil filling mode, that is, oil filling is performed continuously. When the oil level in the transformer bushing reaches the standard oil level, the ultrasonic sensor feeds back a signal to the control box, and the control box controls the oil pump to stop. Compared with the prior art, the bushing oil filling device of the embodiment of the present invention adopts an oil pump instead of a needle tube for oil filling, thereby improving the oil filling efficiency. At the same time, an ultrasonic sensor is used to detect the oil level in real time. First, the oil filling is stopped immediately after the oil filling amount reaches the standard, thereby improving the accuracy of oil level control. Second, the oil filling amount is controlled so that oil overflow will not occur due to negligence of personnel.

[0007] Optionally, the oil pipe joint includes a head and a body, the head is provided with a plurality of oil outlet holes, and the outside of the head is wrapped with non-woven fabric.

[0008] By adopting the above technical solution, the non-woven fabric is provided to effectively prevent the transformer oil from bubbling during oil filling, thereby ensuring the accuracy of the oil level.

[0009] Optionally, the body of the oil pipe joint is provided with an annular protrusion and is fixed to the oil filling pipe by a clamp.

[0010] By adopting the above technical solution, the oil pipe joint and the oil filling pipe can be effectively connected through the protrusion and the clamp.

[0011] Optionally, the oil pipe joint is fixedly connected to the inside of the oil filling nozzle, and the oil filling nozzle and the oil filling pipe are detachably connected.

[0012] By adopting the above technical solution, accidental loss or damage of the oil pipe joint can be effectively avoided.

[0013] Optionally, a retaining ring and an annular slot are provided on the outer wall of the oil filling nozzle, and a connecting mechanism is provided on the oil filling pipe. The connecting mechanism includes an insert that is inserted into the slot by oil pressure and automatically moves out of the slot after pressure loss.

[0014] By adopting the above technical solution, the insert is inserted into the slot through oil pressure drive, thereby achieving firm fixation of the oil filling nozzle and the oil filling pipe, and automatically moves out of the slot after pressure loss, thereby improving the firmness and convenience of the connection between the two.

[0015] Optionally, the connecting mechanism also includes a fixed cylinder that is evenly surrounded and fixed on the outer wall of the oil filling pipe, and the end of the fixed cylinder away from the oil filling pipe is connected to the oil filling pipe by an inclined connecting pipe, the insert cylinder is slidably installed in the fixed cylinder, the insert cylinder is slidably passed through the oil filling pipe, a force transmission rod is vertically fixed to the middle of the bottom wall of the insert cylinder, a force plate is vertically fixed to the end of the force transmission rod, a sliding sealing ring is provided between the force plate and the inner wall of the fixed cylinder, and a compression spring is provided between the insert cylinder and the fixed cylinder, and the compression spring has the tendency to elastically drive the insert cylinder out of the slot.

[0016] By adopting the above technical solution, the oil filling nozzle and the oil pipe joint are plugged and fixed with the help of oil pressure without consuming additional external energy. The compression spring is used to move the insert tube out, thereby realizing the connection between the oil filling nozzle and the oil filling pipe. The greater the oil pressure, the stronger the connection between the two.

[0017] Optionally, an auxiliary sealing mechanism is also included, which includes an inner insert edge that is obliquely fixed to the inner wall of the oil filling pipe and extends toward the oil filling nozzle, and the end of the oil filling nozzle is detachably inserted between the inner wall of the oil filling pipe and the outer wall of the inner insert edge, and a fixed sealing ring and a sealing film are provided on the inner insert edge. A guide plate is hinged at the connection between the inner insert edge and the oil filling pipe, a connecting rod is fixed to the guide plate, and a pressure rod for applying pressure to the sealing film is fixed to the end of the connecting rod.

[0018] By adopting the above technical solution, the guide plate not only guides the transformer oil into the fixed cylinder, but also drives the pressure rod to press against the sealing membrane to improve the sealing performance. That is, the guide plate plays a dual role in the embodiment of the present invention.

[0019] Optionally, an auxiliary driving mechanism is also included, which includes a pull rope passing through the connecting tube, one end of the pull rope is connected to the end of the force-bearing plate away from the connecting tube, and the other end of the pull rope is connected to the guide plate. A group of support rods are vertically fixed on the corresponding side walls of the force-bearing plate and the fixed tube, and the two groups of support rods are arranged in an alternating manner. A gap is provided between two adjacent support rods in the same group, and a rope pressure rod is fixed to the end of the support rod.

[0020] By adopting the above technical solution, the compression spring cooperates with the oil pressure to realize the automatic entry or exit of the insert cylinder into the slot, and after the insert cylinder is out of the slot, the pull rope is used to drive the guide plate to rotate and drive the pressure rod to separate from the sealing film. That is, the force plate can be used as a driving member to drive the insert cylinder to move, and can also be used as a driving member to drive the pressure rod to move, thus achieving a dual driving effect; under the coordinated action of the connecting mechanism, the auxiliary sealing mechanism and the auxiliary driving mechanism, the firmness of the oil filling pipe and the oil filling nozzle after insertion and the sealing between the two are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the casing oil replenishing device of Example 1 of the present invention.

[0022] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0023] Figure 3 Schematic diagram of the structure of the oiling nozzle of embodiment 2 of the present invention.

[0024] Figure 4 It is a schematic diagram of the installation positions of the connecting mechanism, auxiliary sealing mechanism and auxiliary driving mechanism of Example 2 of the present invention.

[0025] Figure 5 yes Figure 4 Schematic diagram of the enlarged portion B.

[0026] Explanation of the accompanying symbols: 1. Transformer bushing; 10. Oil filling nozzle; 100. Retaining ring; 101. Slot; 11. Observation window; 2. Oil filling pipe; 20. Clamp; 3. Oil pipe joint; 30. Head; 300. Oil outlet; 31. Body; 32. Non-woven fabric; 4. Oil pump; 40. Oil tank; 5. Control box; 6. Ultrasonic sensor; 7. Connecting mechanism; 70. Fixed cylinder; 71. Connecting pipe; 72. Insert cylinder; 73. Force transmission rod; 74. Force plate; 75. Sliding sealing ring; 76. Compression spring; 8. Auxiliary sealing mechanism; 80. Insert edge; 81. Fixed sealing ring; 82. Guide plate; 83. Sealing membrane; 84. Connecting rod; 85. Pressure rod; 9. Auxiliary driving mechanism; 90. Pull rope; 91. Fixed ring; 92. Support rod; 93. Pressure rope rod. DETAILED DESCRIPTION

[0027] The following combination Figure 1-Figure 5 The present invention is described in further detail.

[0028] An embodiment of the present invention discloses a casing oil replenishing device. Example 1

[0029] Reference Figure 1 and Figure 2 The transformer bushing 1 is provided with an oil filling nozzle 10 at the top and an observation window 11 in the middle. The bushing oil replenishing device includes an oil filling pipe 2, an oil pipe joint 3, an oil pump 4, a control box 5, and an ultrasonic sensor 6. An oil passage is provided inside the oil pipe joint 3. The oil pipe joint 3 includes a head portion 30 with a larger diameter and a body portion 31 with a smaller diameter. Five oil outlet holes 300 are evenly distributed on the head portion 30, and an annular protrusion is provided on the body portion 31.

[0030] Reference Figure 1 and Figure 2 The body 31 is inserted into the oil filling pipe 2 and secured to the oil filling pipe 2 via a clamp 20. The head 30 is wrapped with a non-woven fabric 32 to prevent foaming of the transformer oil during filling and ensure accurate oil level. The oil pipe connector 3 passes through the oil filling nozzle 10 and extends approximately 2 cm into the transformer bushing 1. The oil pump 4 has a built-in check valve. One end of the oil pump 4 is connected to the oil tank 40 and the other end is connected to the oil filling pipe 2. The control box 5 controls the operation of the oil pump 4. The ultrasonic sensor 6 is mounted on the top of the transformer bushing 1 and is electrically connected to the control box 5. The ultrasonic sensor 6 is used to detect the oil level in the transformer bushing 1.

[0031] The operating principle of Example 1 is as follows: the device has two oil filling modes: a quantitative oil filling mode, in which oil is filled according to the oil filling amount input on the control box 5; and a fixed oil filling mode, in which oil is filled continuously. When the oil level in the transformer bushing 1 reaches the standard oil level, the ultrasonic sensor 6 sends a feedback signal to the control box 5, which controls the oil pump 4 to stop. The oil pump 4 is the actuator of the oil filling process. When the control box 5 energizes the oil pump 4, oil filling begins. When the control box 5 energizes the oil pump 4, oil filling stops immediately. The ultrasonic sensor 6 is the oil level measuring component and transmits the oil level data to the control box 5 in real time, which is used to determine whether to stop oil filling.

[0032] Compared with the prior art, the casing oil replenishing device of embodiment 1 of the present invention adopts an oil pump 4 instead of a needle tube for oil replenishment, thereby improving the oil replenishment efficiency; at the same time, an ultrasonic sensor 6 is adopted to detect the oil level in real time. Firstly, the oil filling is stopped immediately after the oil filling amount reaches the standard, thereby improving the accuracy of oil level control; secondly, the oil filling amount is controlled so that oil overflow will not occur due to negligence of personnel. Example 2

[0033] Reference Figure 3 and Figure 4This embodiment differs from the first embodiment in that, to prevent the oil pipe joint 3 from being accidentally lost or contaminated, the oil pipe joint 3 in this embodiment is fixedly connected to the inside of the oil filling nozzle 10, and the oil filling pipe 2 is detachably mounted on the outside of the oil filling nozzle 10. The outer wall of the oil filling nozzle 10 is provided with a retaining ring 100 and an annular slot 101, and the oil filling pipe 2 is provided with a connecting mechanism 7, an auxiliary sealing mechanism 8, and an auxiliary driving mechanism 9.

[0034] Reference Figure 4 and Figure 5 The connecting mechanism 7 includes a fixed cylinder 70 uniformly surrounding and fixed to the outer wall of the oil filling pipe 2. A connecting pipe 71 is fixedly connected at an angle between the end of the fixed cylinder 70 away from the oil filling pipe 2 and the oil filling pipe 2. The connecting pipe 71 connects the interior of the fixed cylinder 70 with the interior of the oil filling pipe 2. An insert cylinder 72 is slidably mounted within the fixed cylinder 70. The insert cylinder 72 slides through the side wall of the oil filling pipe 2 and is inserted into the slot 101. A force transmission rod 73 is vertically fixed to the middle of the bottom wall of the insert cylinder 72. The other end of the force transmission rod 73 is vertically fixed to a force plate 74.

[0035] Reference Figure 4 and Figure 5 The force-bearing plate 74 is slidably connected to the fixed cylinder 70, and a sliding seal 75 is installed on the force-bearing plate 74. The end of the insert cylinder 72 away from the slot 101 is bent outward to form an outer edge, and the end of the fixed cylinder 70 near the oil filling pipe 2 is bent inward to form an inner edge. A compression spring 76 is installed between the outer and inner edges, and the compression spring 76 has the elasticity to drive the insert cylinder 72 to move out of the slot 101.

[0036] Reference Figure 4 and Figure 5 The auxiliary sealing mechanism 8 includes an inner insert edge 80 that is fixedly connected to the inner wall of the oil filling pipe 2 and extends toward the oil filling nozzle 10. A chamfer is provided on the inner wall of the end of the oil filling nozzle 10, and the inner insert edge 80 is adapted to the chamfer. A fixed sealing ring 81 is fixedly connected to the outer surface of the inner insert edge 80. The oil filling nozzle 10 and the inner insert edge 80 are sealed by the fixed sealing ring 81. A guide plate 82 is hinged at the junction of the inner insert edge 80 and the inner wall of the oil filling pipe 2. The guide plate 82 is used to guide part of the transformer oil into the connecting pipe 71.

[0037] Reference Figure 4 and Figure 5 A sealing membrane 83 is also fixed to the inner insert edge 80. This membrane can contain transformer oil. A groove for accommodating this membrane is defined at the corresponding position of the chamfer of the oil filling nozzle 10. An L-shaped connecting rod 84 is fixed to one side of the middle portion of the guide plate 82, near the inner insert edge 80. A pressure rod 85 is fixed perpendicularly to the other end of the connecting rod 84. This pressure rod 85 applies pressure to the sealing membrane 83, ensuring close contact between the sealing membrane 83 and the inner wall of the groove.

[0038] Reference Figure 4 and Figure 5The auxiliary drive mechanism 9 includes a pull rope 90 that passes through the connecting tube 71. One end of the pull rope 90 is connected to the end of the force-bearing plate 74 away from the connecting tube 71 through a fixing ring 91. The other end of the pull rope 90 is connected to the middle of the guide plate 82 through a fixing ring 91. A group of vertically arranged support rods 92 are fixedly connected to the surface of the force-bearing plate 74 and the inner wall of the fixed cylinder 70 respectively. The two groups of support rods 92 are staggered. A gap is set between two adjacent support rods 92 in the same group. A rope pressing rod 93 is also vertically fixed to the end of the support rod 92.

[0039] The implementation principle of Example 2 is as follows: when the oil filling pipe 2 is docked onto the oil filling nozzle 10, the oil filling pipe 2 contacts the retaining ring 100, indicating that the docking is in place. At this time, the oil filling nozzle 10 is inserted between the inner wall of the oil filling pipe 2 and the outer wall of the inner insertion edge 80, and friction is generated on the contact surface. Then the oil pump 4 is started, and part of the transformer oil enters the oil filling nozzle 10 through the oil filling pipe 2, and another part enters the fixed cylinder 70 through the connecting pipe 71 under the guidance of the guide plate 82. The oil pressure drives the force plate 74 to overcome the elastic force of the compression spring 76 and move toward the oil filling nozzle 10, so that the insert 72 is inserted into the slot 101, so that the oil filling pipe 2 and the oil filling nozzle 10 are clamped and fixed, and the greater the oil pressure, the more firmly the insert 72 and the slot 101 are plugged in.

[0040] At the same time, due to the oil pressure driving the force plate 74 to move, the two groups of support rods 92 move away from each other, so that the pull rope 90 is in a relaxed state, and the pull rope 90 has no pulling effect on the guide plate 82. Under the impact of the transformer oil, the guide plate 82 rotates toward the inner insertion direction 80, and the guide plate 82 drives the connecting rod 84 and the pressure rod 85 to move, thereby making the pressure rod 85 more effectively exert pressure on the sealing film 83, making the sealing film 83 contact with the groove more closely, thereby improving the sealing effect and the firmness of the connection between the oil filling nozzle 10 and the oil filling pipe 2.

[0041] When the oil injection is stopped, the elastic force of the compression spring 76 overcomes the oil pressure, thereby driving the insert 72 to drive the force plate 74 to move in the opposite direction, and the insert 72 moves out of the slot 101. At the same time, the two groups of support rods 92 approach each other and cross each other, so that the pull rope 90 is bent multiple times under the squeezing action of multiple rope-pressing rods 93. The pull rope 90 is tightened and pulls the guide plate 82 to rotate away from the inner insertion edge 80. The guide plate 82 drives the pressure rod 85 to separate from the sealing membrane 83, thereby preventing the pressure rod 85 from affecting the oil injection nozzle 10 from escaping from the oil injection pipe 2.

[0042] When the oil filling nozzle 10 and the oil pipe joint 3 are plugged in and fixed by means of oil pressure, no additional external energy is consumed. The guide plate 82 not only guides the transformer oil into the fixed cylinder 70, but also drives the pressure rod 85 to press against the sealing membrane 83 to improve the sealing performance. That is, the guide plate 82 plays a dual role in the embodiment of the present invention; the compression spring 76 cooperates with the oil pressure to realize the automatic entry or exit of the insert cylinder 72 into or out of the slot 101, and after the insert cylinder 72 is out of the slot 101, the guide plate 82 is driven to rotate by the pull rope 90 and drive the pressure rod 85 to separate from the sealing membrane 83, that is, the force plate 74 can be used as a driving member to drive the insert cylinder 72 to move, and as a driving member to drive the pressure rod 85 to move, thereby achieving a dual driving effect; under the coordinated action of the connecting mechanism 7, the auxiliary sealing mechanism 8 and the auxiliary driving mechanism 9, the firmness of the oil filling pipe 2 and the oil filling nozzle 10 after plugging in and the sealing between the two are effectively improved.

[0043] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A casing oil replenishing device, characterized in that: The invention comprises an oil filling pipe (2), an oil pipe joint (3), an oil pump (4), a control box (5) and an ultrasonic sensor (6); an oil filling nozzle (10) is provided on the transformer bushing (1); the oil pipe joint (3) is placed in the transformer bushing (1) through the oil filling nozzle (10); the ultrasonic sensor (6) is installed on the top of the transformer bushing (1) and extends into the transformer bushing (1); and the ultrasonic sensor (6) and the oil pump (4) are both electrically connected to the control box (5).

2. The casing oil replenishing device according to claim 1, characterized in that: The oil pipe joint (3) comprises a head (30) and a body (31); the head (30) is provided with a plurality of oil outlet holes (300); and the outer side of the head (30) is wrapped with non-woven fabric (32).

3. The casing oil replenishing device according to claim 2, characterized in that: The body (31) of the oil pipe joint (3) is provided with an annular protrusion and is fixed to the oil filling pipe (2) via a clamp (20).

4. The casing oil replenishing device according to claim 2, characterized in that: The oil pipe joint (3) is fixedly connected to the inside of the oil filling nozzle (10), and the oil filling nozzle (10) and the oil filling pipe (2) are detachably connected.

5. The casing oil replenishing device according to claim 4, characterized in that: The outer wall of the oil filling nozzle (10) is provided with a retaining ring (100) and an annular slot (101); the oil filling pipe (2) is provided with a connecting mechanism (7); the connecting mechanism (7) comprises an insert (72) which is inserted into the slot (101) by oil pressure and automatically moves out of the slot (101) after pressure loss.

6. The casing oil replenishing device according to claim 5, characterized in that: The connecting mechanism (7) further comprises a fixed cylinder (70) uniformly surrounding and fixedly connected to the outer wall of the oil filling pipe (2); an end of the fixed cylinder (70) away from the oil filling pipe (2) is connected to the oil filling pipe (2) via an inclined connecting pipe (71); an insert cylinder (72) is slidably installed in the fixed cylinder (70); the insert cylinder (72) is slidably passed through the oil filling pipe (2); a force transmission rod (73) is vertically fixedly connected to the middle of the bottom wall of the insert cylinder (72); a force plate (74) is vertically fixedly connected to the end of the force transmission rod (73); a sliding sealing ring (75) is provided between the force plate (74) and the inner wall of the fixed cylinder (70); a compression spring (76) is provided between the insert cylinder (72) and the fixed cylinder (70); and the compression spring (76) has a tendency to elastically drive the insert cylinder (72) out of the slot (101).

7. The casing oil replenishing device according to claim 6, characterized in that: The invention also includes an auxiliary sealing mechanism (8), which includes an inner insert edge (80) fixedly connected to the inner wall of the oil filling pipe (2) and extending toward the oil filling nozzle (10). The end of the oil filling nozzle (10) is detachably inserted between the inner wall of the oil filling pipe (2) and the outer wall of the inner insert edge (80). A fixed sealing ring (81) and a sealing film (83) are provided on the inner insert edge (80). A guide plate (82) is hingedly connected at the junction of the inner insert edge (80) and the oil filling pipe (2). A connecting rod (84) is fixedly connected to the guide plate (82). A pressure rod (85) for applying pressure to the sealing film (83) is fixedly connected to the end of the connecting rod (84).

8. The casing oil replenishing device according to claim 7, characterized in that: The auxiliary drive mechanism (9) includes a pull rope (90) passing through the connecting tube (71), one end of the pull rope (90) is connected to the end of the force-bearing plate (74) away from the connecting tube (71), and the other end of the pull rope (90) is connected to the guide plate (82). A group of support rods (92) are vertically fixed to the corresponding side walls of the force-bearing plate (74) and the fixed tube (70), respectively. The two groups of support rods (92) are arranged in a staggered manner, and a gap is set between two adjacent support rods (92) in the same group. A rope pressing rod (93) is fixed to the end of the support rod (92).

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