Leakage-proof non-return mechanism with exhaust function and transformer

Abstract

The utility model relates to a leakproof non-return mechanism with exhaust function and a transformer, which comprise a valve body, a nitrogen injection port is arranged at one end of the valve body, a valve core capable of blocking the nitrogen injection port is arranged in the nitrogen injection port, the valve body comprises a valve core seat and an exhaust seat which are fixed with each other, a guide plate is arranged in the valve body, and a guide hole is arranged in the center of the guide plate. A through hole is formed in the guide plate, the valve element is arranged in the valve body, one end of the valve element is provided with a plug capable of plugging the nitrogen injection opening, the other end of the valve element is provided with a guide rod capable of axially moving along the guide hole, the outer wall of the guide rod is sleeved with a spring, an exhaust hole is formed in the exhaust seat, and an exhaust bolt is arranged on the exhaust hole. According to the non-return mechanism, it is guaranteed that internal air can be thoroughly exhausted in the installation process, meanwhile, the excellent sealing performance after the exhaust port is closed is considered, the sealing structure innovatively adopts the conical face sealing design, the sealing effect is enhanced, the problem of cutting of the sealing ring is effectively prevented, and the reliability and durability of the non-return mechanism are comprehensively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an anti-leakage check mechanism with an exhaust function and a transformer equipped with the anti-leakage check mechanism. Background Art

[0002] The check mechanism, as a crucial component in the nitrogen filling system for explosion prevention and fire protection, is designed to prevent the reverse flow of oil medium and ensure the stable operation of the system. However, there is a significant defect in some current check mechanisms on the market: it is difficult to effectively discharge the accumulated air inside during the installation process. This problem may cause the gas density relay inside the system to malfunction.

[0003] In addition, for the check mechanism operating in a low-temperature environment, another problem that cannot be ignored is the easy occurrence of oil leakage. Under low-temperature conditions, the elasticity and sealing performance of the sealing material will decrease significantly. Coupled with the fact that the oil may become more viscous due to temperature reduction, the risk of sealing failure increases. Once oil leakage occurs, it will not only cause waste of resources, but also pollute the environment and even pose a threat to the safe operation of the equipment. Summary of the Utility Model

[0004] Aiming at the deficiencies in the prior art, the utility model provides an anti-leakage check mechanism with an exhaust function and a transformer, which have a simple structure, are convenient to use, and are safe and reliable.

[0005] The utility model is realized through the following technical solutions:

[0006] An anti-leakage check mechanism with an exhaust function includes a valve body with a hollow structure. One end of the valve body has a nitrogen injection port, and a valve core capable of blocking it is arranged in the nitrogen injection port. The valve body includes a valve core seat and an exhaust seat fixed together. A guide plate is arranged inside the valve body. A guide hole is opened in the center of the guide plate, and a through hole capable of communicating the inner cavities of the valve core seat and the exhaust seat is opened on the guide plate. The valve core is arranged inside the valve body. One end of the valve core has a plug capable of blocking the nitrogen injection port, and the other end has a guide rod capable of axially moving along the guide hole. A spring is sleeved on the outer wall of the guide rod. One end of the spring abuts against the end face of the plug, and the other end abuts against the end face of the guide plate. An exhaust hole is opened on the exhaust seat, and an exhaust bolt is arranged on the exhaust hole.

[0007] To facilitate the installation of the internal structure, the valve core seat and the exhaust seat are welded together. The outer diameters of the valve core seat and the exhaust seat are the same, and the inner cavity diameter of the valve core seat is larger than the inner cavity diameter of the exhaust seat.

[0008] To facilitate the assembly of the guide plate, one end of the exhaust seat is inserted into the inner cavity of the valve core seat, and the guide plate is sleeved inside the inner wall of the valve core seat and abuts against the end face of the exhaust seat inserted into the inner cavity of the valve core seat.

[0009] In order to facilitate the installation of the anti-leakage check mechanism on the nitrogen injection pipeline, flange plates are respectively fixed to the outer ends of the valve core seat and the exhaust seat.

[0010] In order to ensure the plugging effect, the outer side of the nitrogen injection port is a circular hole, and the inner side is a conical hole. The plug has a cylinder capable of plugging the circular hole and a cone capable of plugging the conical hole.

[0011] In order to further improve the sealing performance, an outer wall of the joint of the cylinder and the cone is sleeved with a sealing ring, and the sealing ring is in interference fit with the inner wall of the circular hole.

[0012] The present utility model also provides a transformer, and the nitrogen injection pipeline of the transformer is provided with the above-mentioned anti-leakage check mechanism with an exhaust function.

[0013] The beneficial effects of the present utility model are as follows: The anti-leakage check mechanism with an exhaust function optimizes the original performance of the check mechanism, designs an innovative exhaust structure, which adopts a firm hard-sealing mechanism to ensure that internal air can be completely exhausted during the installation process, and at the same time takes into account the excellent sealing performance after the exhaust port is closed. For the low-temperature environment, low-temperature-resistant and high-performance sealing materials are selected, and these materials can maintain elasticity and sealing efficiency at extremely low temperatures, greatly reducing the risk of oil leakage. In addition, the sealing structure innovatively adopts a conical surface sealing design, which not only enhances the sealing effect, but also effectively prevents the problem of the sealing ring being cut, comprehensively improving the reliability and durability of the check mechanism. Description of the Drawings

[0014] Figure 1 It is a three-dimensional structure schematic diagram of the anti-leakage check mechanism with an exhaust function of the present utility model;

[0015] Figure 2 It is a cross-sectional view of the anti-leakage check mechanism with an exhaust function of the present utility model;

[0016] Figure 3 It is a schematic diagram of the structure inside the valve core seat of the present utility model. Detailed Embodiments

[0017] The following combines the drawings to elaborate on the preferred embodiments of the present utility model, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. The directional terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., are only references to the directions of the attached drawings. Therefore, the directional terms used are for explaining and understanding the present utility model, rather than for limiting the present utility model.

[0018] As Figure 1An anti-leakage check mechanism with exhaust function shown in the figure comprises a valve body with a hollow structure, wherein the valve body comprises a valve core seat 1 and an exhaust seat 2 which are fixed to each other, the valve core seat 1 and the exhaust seat 2 being welded together, the valve core seat 1 and the exhaust seat 2 having the same outer diameter, flanges 4 being fixed to the outer ends of the valve core seat 1 and the exhaust seat 2 respectively, the anti-leakage check mechanism can be installed on a nitrogen injection pipeline through the flanges 4, an exhaust hole is provided on the exhaust seat 2, an exhaust bolt 3 is threadedly connected to the exhaust hole, and air in the pipeline can be discharged through the exhaust hole, thereby facilitating nitrogen injection.

[0019] Specifically, combined Figure 2 , Figure 3 As shown, the valve core seat 1 and the exhaust seat 2 are both cylindrical hollow structures, the inner cavity diameter of the valve core seat 1 is larger than the inner cavity diameter of the exhaust seat 2, one end of the exhaust seat 2 is inserted into the inner cavity of the valve core seat 1, one end of the valve core seat 1 has a nitrogen injection port, and a valve core 7 capable of blocking it is arranged in the nitrogen injection port, and a guide plate 5 is arranged in the valve core seat 1, the guide plate 5 is sleeved on the inner wall of the valve core seat 1 and abuts against the end face of the exhaust seat 2 inserted into the inner cavity of the valve core seat 1, a guide hole is opened in the center of the guide plate 5, and a plurality of through holes 6 capable of connecting the inner cavity of the valve core seat 1 and the inner cavity of the exhaust seat 2 are evenly opened on the guide plate 5, the valve core 7 is arranged in the valve core seat 1, and one end of the valve core 7 A plug is provided for blocking the nitrogen injection port, and the other end is provided with a guide rod which can move axially along the guide hole. A spring 8 is sleeved on the outer wall of the guide rod. One end of the spring 8 abuts against the end face of the plug, and the other end abuts against the end face of the guide plate 5. The spring 8 can abut the guide plate 5 and the valve core 7. The outer side of the nitrogen injection port is a circular hole 101, and the inner side is a conical hole 102. The plug has a cylinder 701 that can block the circular hole 101 and a cone 702 that can block the conical hole 102. A sealing ring 9 is sleeved on the outer wall of the junction of the cylinder 701 and the cone 702. The sealing ring 9 is interference fit with the inner wall of the circular hole 101.

[0020] When in use, open the exhaust bolt 3, the oil in the transformer enters the exhaust seat 2, and the air in the pipeline and the exhaust seat 2 is discharged. At this time, the valve core 7 is in a closed state and there will be no oil leakage. After the air is discharged, close the exhaust bolt 3, start to inject nitrogen into the pipeline, and the nitrogen enters from the nitrogen injection port of the valve core seat 1. The valve core 7 moves inward along the guide plate 5 under pressure, and the spring 8 contracts, then the nitrogen injection port opens, and the nitrogen can enter the nitrogen injection pipeline and the transformer through the exhaust seat 2, realizing the one-way air intake function.

[0021] The anti-leakage and non-return mechanism with exhaust function can be installed on the nitrogen inlet pipe of the oil-immersed transformer explosion-proof and fire-proof device (CN 211555615U) previously applied by the applicant for easy replacement of bursting discs, to achieve the anti-leakage and non-return function during nitrogen injection.

[0022] In addition, in the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "setting", "providing", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] The above-described embodiments merely represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. An anti-leakage check mechanism with exhaust function, comprising a valve body with a hollow structure, one end of the valve body having a nitrogen injection port, a valve core capable of sealing the nitrogen injection port being arranged in the nitrogen injection port, characterized in that: The valve body includes a valve core seat and an exhaust seat that are fixed to each other. A guide plate is arranged in the valve body. A guide hole is opened in the center of the guide plate. A through hole that can communicate with the inner cavity of the valve core seat and the inner cavity of the exhaust seat is opened on the guide plate. The valve core is arranged in the valve body. One end of the valve core is provided with a plug that can seal the nitrogen injection port, and the other end is provided with a guide rod that can move axially along the guide hole. A spring is sleeved on the outer wall of the guide rod. One end of the spring abuts against the end face of the plug, and the other end abuts against the end face of the guide plate. An exhaust hole is opened on the exhaust seat, and an exhaust bolt is arranged on the exhaust hole.

2. The anti-leakage and non-return mechanism with exhaust function according to claim 1, characterized in that: The valve core seat and the exhaust seat are welded together, the valve core seat and the exhaust seat have the same outer diameter, and the inner cavity diameter of the valve core seat is larger than the inner cavity diameter of the exhaust seat.

3. The anti-leakage and non-return mechanism with exhaust function according to claim 2, characterized in that: One end of the exhaust seat is inserted into the inner cavity of the valve core seat, and the guide plate is sleeved on the inner wall of the valve core seat and abuts against the end face of the exhaust seat inserted into the inner cavity of the valve core seat.

4. The anti-leakage and non-return mechanism with exhaust function according to claim 1, characterized in that: Flanges are fixed to the outer ends of the valve core seat and the exhaust seat respectively.

5. The anti-leakage and non-return mechanism with exhaust function according to claim 1, characterized in that: The nitrogen injection port has a circular hole on the outside and a conical hole on the inside. The plug has a cylinder capable of blocking the circular hole and a cone capable of blocking the conical hole.

6. The anti-leakage and non-return mechanism with exhaust function according to claim 5, characterized in that: A sealing ring is sleeved on the outer wall of the joint between the cylinder and the cone, and the sealing ring is interference-fitted with the inner wall of the circular hole.

7. A transformer, characterized in that: The nitrogen injection pipeline of the transformer is provided with an anti-leakage and non-return mechanism with exhaust function as claimed in any one of claims 1 to 6.

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