Self-locking type sealing oil tank for mutual inductor oil level temperature compensation
By designing a self-locking sealed oil tank and using a combination of sliding seals and self-locking sealing rings, the problems in the existing technology of poor sealing effect and air layer impurities affecting the oil have been solved, achieving good sealing effects and ensuring oil quality. .
Patent Information
- Application Number
- CN202421019297.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-11
AI Technical Summary
The existing oil-immersed capacitive transformers have poor sealing effect, which is prone to oil seepage in the oil tank, and impurities in the air layer design affect the oil products, resulting in a decline in the quality of the oil products.
A self-locking sealed oil tank is designed, which uses a combination of sliding seals and self-locking sealing rings. Oil level compensation is performed through the sliding seal, which avoids the existence of air layers and ensures the sealing effect and the quality of the oil.
It achieves a good sealing effect, avoids oil leakage from the fuel tank, ensures the long-term operational reliability of the oil, and has no air layer impurities affecting the oil.
Smart Images
Figure CN222380390U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mutual inductors, and in particular to a self-locking sealed oil tank for oil level temperature compensation of mutual inductors. Background Art
[0002] Oil-immersed capacitor transformer is a transformer that combines oil-immersed technology and capacitor principle. This transformer usually immerses the core, coil and other components of the transformer in an insulating shell, and uses oil as the insulating medium. At the same time, it also uses the principles of physics, especially the principles of capacitor voltage divider and medium voltage transformer, to achieve its measurement and protection functions.
[0003] The main advantages of oil-immersed capacitor transformers include good insulation performance, heat dissipation performance and noise control. The insulating oil provides good protection for the windings, preventing them from being attacked by moisture and chemical corrosion. At the same time, due to the high thermal conductivity of the oil, the transformer can better dissipate heat and prevent overheating. In addition, the insulating oil can effectively reduce the noise and other interference of the current transformer. However, there are also some potential problems with oil-immersed capacitor transformers, such as the possibility of leakage of insulating oil, which may pose a safety hazard. Therefore, when using this type of transformer, regular maintenance and inspection are required to ensure its normal operation.
[0004] At present, the oil tank of oil-immersed capacitor transformers is generally sealed by a single sealing ring, and an air layer for temperature compensation is sealed inside. When the oil temperature rises, the compressed air layer is used for temperature compensation; when the oil temperature drops, the internal negative pressure is generated, and leakage is likely to occur when the seal is defective; and the design of the air layer may cause problems such as water and hydrogen impurities to be stored inside, which will damage the quality of transformer oil in long-term operation, and even cause oxidation and cracking of the oil in severe cases. Utility Model Content
[0005] The purpose of the utility model is to overcome the shortcomings of the prior art such as poor sealing effect and damage to oil quality, and to provide a self-locking sealed oil tank for oil level temperature compensation of a mutual inductor, which has a reasonable design and ingenious structure, performs oil level compensation through sliding seals, has a good sealing effect and is free of impurities such as air layers that affect the oil, which can not only avoid oil leakage in the oil tank, but also ensure the reliability of long-term operation of the oil.
[0006] The utility model is realized through the following technical scheme: a self-locking sealed oil tank for oil level temperature compensation of a mutual inductor, comprising an oil tank body, a tank opening is opened on the top side of the oil tank body, an annular sealing baffle is arranged inside the tank opening, and a tank cover mechanism that can slide up and down is arranged inside the annular sealing baffle; the tank cover mechanism comprises a cover body movably arranged inside the annular sealing baffle and a sliding seal movably arranged inside the oil tank body, the cover body and the sliding seal are integrally connected and form a step structure, the step surface of the step structure corresponds to the annular sealing baffle, so that the outer side wall of the cover body can slide in contact with the inner side wall of the annular sealing baffle, and the outer side wall of the sliding seal can slide in contact with the inner side wall of the oil tank body; the outer side wall of the sliding seal is embedded with a main sealing ring, and the sliding seal is sealed with the oil tank body through the main sealing ring; the top side of the step surface is embedded with a self-locking sealing ring, and the step surface is sealed with the annular sealing baffle through the self-locking sealing ring.
[0007] A further improvement of the utility model is that an auxiliary sealing ring is embedded in the inner side wall of the annular sealing baffle, and the annular sealing baffle is sealed and matched with the cover body through the auxiliary sealing ring.
[0008] A further improvement of the utility model is that a pressure sensor is arranged at the bottom of the oil tank body, and the pressure sensor cooperates with the sliding seal, so that the sliding seal can trigger the pressure sensor.
[0009] A further improvement of the utility model is that the box cover mechanism is provided with an inner cavity, and an inner cavity opening is opened on the bottom side of the box cover mechanism.
[0010] A further improvement of the utility model is that a bearing is embedded in the inner wall of the oil tank body, and the oil tank body is slidably matched with the sliding seal through the bearing.
[0011] A further improvement of the utility model is that a reinforced base is arranged on the bottom side of the oil tank body.
[0012] From the above technical scheme, it can be seen that the beneficial effects of the utility model are as follows: at high temperatures, the insulating oil inside the oil tank body is heated, and the cover mechanism is passively forced to slide upward. During the sliding process, the oil pressure can be kept stable by the main sealing ring and the self-locking sealing ring; at low temperatures, the insulating oil shrinks, and the box cover mechanism works by its own weight and atmospheric pressure, and the box cover mechanism slides downward to reduce the internal volume of the oil tank body, avoiding the situation where the oil tank body has an internal negative pressure state. It can be seen that the design of the oil tank is reasonable, the structure is ingenious, the oil level is compensated by sliding seals, the sealing effect is good, and there is no air layer or other impurities that affect the oil product, which not only avoids oil leakage in the oil tank, but also ensures the reliability of the long-term operation of the oil product, which is conducive to production and suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0014] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.
[0015] Figure 2 yes Figure 1 Enlarged view of part A in the figure.
[0016] 1. Oil tank body; 2. Annular sealing baffle; 3. Reinforced base; 4. Cover body; 5. Sliding seal; 6. Step surface; 7. Main sealing ring; 8. Self-locking sealing ring; 9. Auxiliary sealing ring; 10. Bearing; 11. Insulating oil. DETAILED DESCRIPTION
[0017] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.
[0018] Please refer to the attached Figure 1 and 2 , combined with a specific embodiment, it is explained as follows: The utility model describes a self-locking sealed oil tank for oil level temperature compensation of a mutual inductor, comprising an oil tank body 1, a box opening is opened on the top side of the oil tank body 1, an annular sealing baffle 2 is arranged inside the box opening, and a box cover mechanism that can slide up and down is arranged inside the annular sealing baffle 2.
[0019] The tank cover mechanism includes a cover body 4 movably arranged inside the annular sealing baffle 2 and a sliding seal 5 movably arranged inside the oil tank body 1. The cover body 4 and the sliding seal 5 are integrally connected and form a step structure. The step surface 6 of the step structure corresponds to the annular sealing baffle 2, so that the outer wall of the cover body 4 can slide in contact with the inner wall of the annular sealing baffle 2, and the outer wall of the sliding seal 5 can slide in contact with the inner wall of the oil tank body 1.
[0020] Specifically, the tank cover mechanism is provided with an inner cavity, and the bottom side of the tank cover mechanism is provided with an inner cavity opening; and a bearing 10 is embedded in the inner side wall of the tank body 1 , and the tank body 1 is slidably matched with the sliding seal 5 through the bearing 10 .
[0021] A main sealing ring 7 is embedded in the outer wall of the sliding seal 5, and the sliding seal 5 is sealed with the oil tank body 1 through the main sealing ring 7; a self-locking sealing ring 8 is embedded in the top side of the step surface 6, and the step surface 6 is sealed with the annular sealing baffle 2 through the self-locking sealing ring 8.
[0022] The use principle of this utility model:
[0023] At high temperatures, the insulating oil 11 inside the oil tank body 1 is heated. According to the principle of thermal expansion and contraction, the oil volume increases, and the cover mechanism is passively forced to slide upward. During the sliding process, the oil pressure stability can be ensured by the main sealing ring 7 and the self-locking sealing ring 8; as follows: when the temperature rises to the design limit, the tank cover mechanism rises to the highest position. At this time, the step surface 6 contacts the annular sealing baffle 2, and the self-locking sealing ring 8 realizes self-locking sealing under the action of oil pressure, ensuring that the product is well sealed under positive pressure. As the oil pressure increases, the self-locking sealing effect is better.
[0024] It should be noted that: the design of the temperature compensation seal structure needs to focus on ensuring that the compensation amount is sufficient; combined with the existing technology, according to the thermal expansion coefficient α of the oil body, the temperature compensation difference ⊿T, and the inner diameter d of the sliding seal, H1 can be calculated based on the formula ⊿V=(G / ρ)*α*⊿T, H1=4⊿V / (πd2). H2≤0.8H1.
[0025] At low temperatures, the insulating oil 11 shrinks, and the tank cover mechanism does work through its own weight and atmospheric pressure, so that the tank cover mechanism slides downward to reduce the internal volume of the tank body 1, thereby avoiding the situation where the tank body 1 is in a negative pressure state.
[0026] In one embodiment, an auxiliary sealing ring 9 is embedded in the inner wall of the annular sealing baffle 2, and the annular sealing baffle 2 is sealed with the cover body 4 through the auxiliary sealing ring 9. The design of the auxiliary sealing ring 9 greatly improves the sealing effect of the oil tank.
[0027] In one embodiment, a pressure sensor is provided at the bottom of the oil tank body 1, and the pressure sensor cooperates with the sliding seal 5, so that the sliding seal 5 can trigger the pressure sensor. Combining the existing sealed oil tank and sensor technology, when the sliding seal 5 slides to the inner bottom surface of the oil tank body 1 due to low temperature, it touches the pressure sensor, and the sensor signal is transmitted to the control center for heating action, thereby avoiding the low temperature negative pressure state of the finished product.
[0028] In one of the embodiments, a reinforcing base 3 is disposed on the bottom side of the fuel tank body 1 , and the design of the reinforcing base 3 can further improve the overall stability of the fuel tank.
[0029] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.
[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A self-locking sealed oil tank for transformer oil level temperature compensation, comprising an oil tank body (1), characterized in that: The top side of the oil tank body (1) is provided with a tank opening, an annular sealing baffle (2) is arranged inside the tank opening, and a tank cover mechanism that can slide up and down is arranged inside the annular sealing baffle (2); the tank cover mechanism comprises a cover body (4) movably arranged inside the annular sealing baffle (2) and a sliding seal (5) movably arranged inside the oil tank body (1); the cover body (4) and the sliding seal (5) are integrally connected and form a step structure, and a step surface (6) of the step structure corresponds to the annular sealing baffle (2). Thus, the outer wall of the cover body (4) can be in sliding contact with the inner wall of the annular sealing baffle (2), and the outer wall of the sliding seal (5) can be in sliding contact with the inner wall of the oil tank body (1); the outer wall of the sliding seal (5) is embedded with a main sealing ring (7), and the sliding seal (5) is in sealing cooperation with the oil tank body (1) through the main sealing ring (7); the top side of the step surface (6) is embedded with a self-locking sealing ring (8), and the step surface (6) is in sealing cooperation with the annular sealing baffle (2) through the self-locking sealing ring (8).
2. A self-locking sealed oil tank for transformer oil level temperature compensation according to claim 1, characterized in that: An auxiliary sealing ring (9) is embedded in the inner side wall of the annular sealing baffle (2), and the annular sealing baffle (2) is sealed with the cover body (4) via the auxiliary sealing ring (9).
3. A self-locking sealed oil tank for transformer oil level temperature compensation according to claim 2, characterized in that: A pressure sensor is provided at the bottom of the oil tank body (1), and the pressure sensor cooperates with the sliding seal (5), so that the sliding seal (5) can trigger the pressure sensor.
4. A self-locking sealed oil tank for oil level temperature compensation of a mutual inductor according to claim 3, characterized in that: The box cover mechanism is provided with an inner cavity, and the bottom side of the box cover mechanism is provided with an inner cavity opening.
5. A self-locking sealed oil tank for oil level temperature compensation of a mutual inductor according to claim 4, characterized in that: A bearing (10) is embedded in the inner wall of the oil tank body (1), and the oil tank body (1) is slidably matched with the sliding seal (5) via the bearing (10).
6. A self-locking sealed oil tank for oil level temperature compensation of a mutual inductor according to claim 5, characterized in that: A reinforced base (3) is provided on the bottom side of the oil tank body (1).