Mixed gas-based voltage transformer

Abstract

The present application relates to the technical field of voltage transformers and discloses a mixed gas-based voltage transformer. The mixed gas-based voltage transformer comprises a voltage transformer body, a gas injection tube, and a sealing assembly. The gas injection tube is integrally formed at the bottom of the voltage transformer body, and the voltage transformer body is filled with insulating gases, wherein the insulating gases comprise a sulfur hexafluoride gas and a nitrogen gas. The sealing assembly comprises an inner tapered cylinder, a connecting structure, a rubber member, and a conical column, wherein the rubber member sequentially comprises, from the center to the edge, a hemispherical head portion, a first tapered ring portion, a connecting portion, and a second tapered ring portion, and the second tapered ring portion is located on the outer side of the first tapered ring portion; a connecting base is fixed at an end portion of the conical column; and the connecting structure is configured to drive the connecting base and the inner tapered cylinder to approach each other in the axial direction of the gas injection tube. The present application can improve sealing performance of the gas injection tube.

Description

A voltage transformer based on mixed gas Technical Field

[0001] This application belongs to the field of voltage transformer technology and relates to a voltage transformer based on a mixed gas. Background Technology

[0002] Current voltage transformers are classified into oil-immersed insulated voltage transformers and gas-insulated voltage transformers according to the different insulating media. Among them, the insulating gas of gas-insulated voltage transformers is sulfur hexafluoride gas or a mixture of sulfur hexafluoride gas and nitrogen gas.

[0003] Gas-insulated voltage transformers have an injection pipe for injecting insulating gas, and are sealed by installing a sealing ring and a sealing cap at the pipe opening. Furthermore, the purpose of the injection pipe and sealing cap is to facilitate the opening and closing of the injection pipe at any time, allowing for periodic sampling of the insulating gas inside the gas-insulated voltage transformer to test its moisture content, thereby ensuring the normal operation of the gas-insulated voltage transformer.

[0004] However, gas-insulated voltage transformers are susceptible to damage from severe weather, harsh surrounding environments, and temperature fluctuations during operation. This can cause the sealing rings to fail, leading to moisture intrusion into the voltage transformer. Summary of the Invention

[0005] To address the problem of poor sealing performance of existing gas injection pipes, a voltage transformer based on mixed gas is provided.

[0006] This application provides a voltage transformer based on a mixed gas, specifically implemented using the following technical solution:

[0007] A voltage transformer based on a mixed gas includes a voltage transformer body, an injection pipe, and a sealing assembly. The injection pipe is integrally formed at the bottom of the voltage transformer body. The voltage transformer body is filled with an insulating gas, including sulfur hexafluoride gas and nitrogen gas. The outer circumferential surface of the end of the injection pipe has a second conical surface, the diameter of which gradually increases away from the voltage transformer body. The inner circumferential surface of the end of the injection pipe has a first conical surface, the diameter of which gradually increases away from the voltage transformer body. The sealing assembly includes an inner conical cylinder, a connecting structure, a rubber component, and a conical column. The rubber component, from its center to its edge, sequentially includes a hemispherical head, a first conical ring, a connecting portion, and... The second conical ring is located outside the first conical ring. The diameters of both the first and second conical rings gradually increase in the direction away from the voltage transformer body. The outer conical surface of the first conical ring is attached to the first conical surface, and the inner conical surface of the second conical ring is attached to the second conical surface. A first conical sleeve is attached to the inner conical surface of the first conical ring, and a second conical sleeve is attached to the outer conical surface of the second conical ring. The inner conical surface of the inner conical cylinder is attached to the outer conical surface of the second conical sleeve, and the conical surface of the conical cylinder is attached to the inner conical surface of the first conical sleeve. A connecting seat is fixed at the end of the conical cylinder. The connecting structure is used to drive the connecting seat and the inner conical cylinder to move closer to each other along the axial direction of the air injection pipe.

[0008] Through the above technical solution, the sealing area is greatly increased by using the inner conical cylinder, connecting structure, rubber parts, and conical column, and by utilizing the fit between the rubber parts and the inlet of the air injection pipe. At the same time, the connecting structure drives the connecting seat and the inner conical cylinder to move closer to each other along the axial direction of the air injection pipe. The conical surface of the conical column abuts against the inner conical surface of the first conical ring through the first conical ring sleeve, so that the outer conical surface of the first conical ring can be tightly fitted to the first conical surface, thereby achieving a seal at this part of the air injection pipe. The inner conical surface of the inner conical cylinder abuts against the outer conical surface of the second conical ring through the second conical ring sleeve, so that the inner conical surface of the second conical ring can be tightly fitted to the second conical surface, thereby achieving a seal at this part of the air injection pipe. That is, through double-strengthened sealing, the sealing performance of the air injection pipe is greatly improved.

[0009] Secondly, the forces exerted by the conical column and the inner conical cylinder on the inlet of the gas injection pipe will be offset and balanced, thereby reducing the occurrence of deformation at the inlet of the gas injection pipe.

[0010] The first and second conical rings can evenly distribute the stress on the rubber component, thereby improving the tightness of the fit between the rubber component and the air injection pipe opening.

[0011] Optionally, the rubber component is divided into a first layer and a second layer along its thickness direction, with a PTFE membrane between the first layer and the second layer. The outer conical surface of the first conical ring of the first layer is attached to the first conical surface, the inner conical surface of the second conical ring of the first layer is attached to the second conical surface, the inner conical surface of the first conical ring of the second layer is attached to the first conical ring sleeve, and the outer conical surface of the second conical ring of the second layer is attached to the second conical ring sleeve. The cross-section of the connecting part of the second layer is arc-shaped.

[0012] Through the above technical solution, by setting up layered rubber parts and PTFE membrane, the low coefficient of friction of PTFE membrane allows the first layer and the second layer to be displaced relative to each other. When the conical column and the inner conical cylinder apply axial force to the first and second conical ring parts of the second layer respectively, the first and second conical ring parts of the second layer will be driven to make a short axial displacement relative to the first layer. This axial displacement further improves the tightness of the second layer against the first layer, thereby greatly improving the sealing performance of the first layer to the gas injection pipe opening.

[0013] The arc-shaped connection allows for a large relative displacement margin between the first and second conical ring portions of the second layer.

[0014] Optionally, the connection structure includes an internally threaded cylinder integrally formed on the end of the inner conical cylinder and an external thread protruding on the outer circumferential surface of the connecting seat, wherein the internal thread of the internally threaded cylinder is threadedly connected to the external thread.

[0015] With the above technical solution, during installation, the rubber part is first fitted onto the inlet of the air injection pipe, ensuring that the outer conical surface of the first conical ring is in contact with the first conical surface, and the inner conical surface of the second conical ring elastically wraps around the second conical surface. Then, the inner conical cylinder and the second conical ring are axially slid, so that the inner conical surface of the inner conical cylinder is in contact with the outer conical surface of the second conical ring through the second conical ring. Then, the inner conical cylinder is kept stationary. The first conical ring is placed on the conical column, and then the connecting seat is gradually tightened. The connecting seat moves axially toward the inner conical cylinder, and the conical column presses against the inner conical surface of the first conical ring through the first conical ring. At the same time, the tightening force will also force the inner conical surface of the inner conical cylinder to be further in contact with the outer conical surface of the second conical ring through the second conical ring, thereby completing the sealing installation.

[0016] Optionally, a compression spring is coaxially sleeved on the outer circumferential surface of the internally threaded cylinder, and a first ring body is sleeved on the internally threaded cylinder. The first ring body is axially slidingly connected to the internally threaded cylinder. The elastic force of the compression spring is used to force the first ring body to slide away from the air injection pipe. The end face of the first ring body is integrally formed with a plurality of circumferentially evenly arranged first limiting teeth. The first limiting teeth are in the shape of isosceles triangles and have a first guide surface and a second guide surface. A second ring body is coaxially fixed on the outer circumferential surface of the connecting seat. The end face of the second ring body is integrally formed with a plurality of circumferentially evenly arranged... The second limiting tooth is in the shape of a right-angled triangle and has a third guide surface. The first limiting tooth and the second limiting tooth mesh with each other. During the tightening of the connecting seat, the tip of the second limiting tooth passes through the first guide surface and the second guide surface of each first limiting tooth in sequence, and the compression spring is gradually elastically compressed. When the tip of the second limiting tooth passes through the first guide surface, the third guide surface is in contact with the first guide surface. When the connecting seat is tightened, the tip of the second limiting tooth remains in the state of abutting against the second guide surface.

[0017] Through the above technical solution, during the tightening process of the connecting seat, the connecting seat gradually approaches the inner conical cylinder, that is, the second limiting tooth gradually approaches the first limiting tooth. During this process, the tip of the second limiting tooth passes through the first guide surface and the second guide surface of each first limiting tooth in sequence, and the compression spring is gradually elastically compressed. When the tip of the second limiting tooth passes through the first guide surface, the third guide surface is in contact with the first guide surface, and the compression degree of the compression spring is maximized. When the tip of the second limiting tooth passes through the second guide surface, the compression spring gradually rebounds. That is, during the tightening process of the connecting seat, the compression spring is in a process of continuous compression and continuous rebound. In the overall process, the second limiting tooth gradually approaches the first limiting tooth, that is, the compression amount of the compression spring gradually increases, while the rebound amount gradually decreases. That is, the elastic potential energy of the compression spring is in a process of accumulation.

[0018] When the joint is finally tightened, the tip of the second limiting tooth remains in contact with the second guide surface. When the connecting seat becomes loose due to thermal expansion and contraction or vibration, the elastic potential energy of the compression spring will be converted into a force that forces the connecting seat to tighten through the contact between the tip of the second limiting tooth and the second guide surface, thereby greatly reducing the loosening of the connecting seat and improving the sealing performance.

[0019] Optionally, the end of the conical column has a pressing head, the diameter of which is smaller than the inner diameter of the air injection pipe. The pressing head presses against the concave surface of the hemispherical head and forces the hemispherical head to elastically deform.

[0020] By using the above technical solution, a pressure head is set up, which presses against the concave surface of the hemispherical head and forces the hemispherical head to deform elastically, so that the outer edge of the hemispherical head can abut against the annular junction between the inner hole of the air injection pipe and the first conical surface, thereby further improving the sealing performance.

[0021] Optionally, the pressing head is axially slidably connected to the conical column, and the conical column is provided with a spring. The elastic force of the spring is used to force the pressing head to slide towards the hemispherical head. When the conical column moves axially towards the rubber part and does not abut against the first conical ring, the pressing head presses against the concave surface of the hemispherical head, and the elastic force of the spring is applied to the hemispherical head through the pressing head to force the hemispherical head to elastically deform.

[0022] Through the above technical solution, by setting a spring and a sliding top pressure head, when the connecting seat is tightened, the spring force is applied to the hemispherical head in advance through the top pressure head, thereby forcing the hemispherical head to deform elastically first, thereby pulling the first conical ring to move axially toward the inner hole of the air injection pipe, and the first conical ring is tightened as a whole, so that the first conical ring is flat and fits the first conical surface in advance, creating conditions for the subsequent pressure of the conical column, and further improving the sealing performance of the first conical ring and the first conical surface.

[0023] Furthermore, when the first conical ring is tightened as a whole, it will also cause the second conical ring to tighten as a whole, so that the second conical ring is flat and fits the second conical surface in advance, thus creating conditions for the subsequent pressure of the inner conical cylinder and further improving the fit and sealing of the second conical ring and the second conical surface.

[0024] Optionally, the connecting structure includes a tension spring, with both ends of the tension spring being detachably connected to the inner conical cylinder and the connecting seat, respectively. The tension of the tension spring is used to drive the connecting seat and the inner conical cylinder to move closer to each other along the axial direction of the air injection pipe.

[0025] Through the above technical solution, by setting a tension spring, the connecting seat and the inner conical cylinder are driven to move closer to each other along the axial direction of the air injection pipe, thereby achieving a double seal. At the same time, the tension of the tension spring is applied to the connecting seat and the inner conical cylinder in real time, so that the connecting seat and the inner conical cylinder apply pressure to the first conical ring and the second conical ring in real time. When the rubber parts expand and contract with temperature and produce gaps, the pressure applied by the connecting seat and the inner conical cylinder in real time can also force the rubber parts to fit more closely to the air injection pipe opening in time to fill the gaps and further improve the sealing performance.

[0026] Furthermore, the tension spring is detachable to facilitate the installation and removal of the sealing components.

[0027] Optionally, the ratio of sulfur hexafluoride gas to nitrogen is 3:7.

[0028] The beneficial effects of this application are:

[0029] 1. Through the inner conical cylinder, connecting structure, rubber parts, and conical column, the sealing area is greatly increased by utilizing the fit between the rubber parts and the inlet of the air injection pipe. At the same time, the connecting structure drives the connecting seat and the inner conical cylinder to move closer to each other along the axial direction of the air injection pipe. The conical surface of the conical column abuts against the inner conical surface of the first conical ring through the first conical ring sleeve, so that the outer conical surface of the first conical ring can be tightly fitted to the first conical surface, thereby achieving a seal at this part of the air injection pipe. The inner conical surface of the inner conical cylinder abuts against the outer conical surface of the second conical ring through the second conical ring sleeve, so that the inner conical surface of the second conical ring can be tightly fitted to the second conical surface, thereby achieving a seal at this part of the air injection pipe. That is, through double-strengthened sealing, the air sealing performance of the air injection pipe is greatly improved.

[0030] 2. By setting up layered rubber parts and PTFE membrane, the low coefficient of friction of PTFE membrane allows the first and second layers to be displaced relative to each other. When the conical column and the inner conical cylinder apply axial force to the first and second conical ring parts of the second layer respectively, the first and second conical ring parts of the second layer will be driven to make a short axial displacement relative to the first layer. This axial displacement further improves the tightness of the second layer against the first layer, thereby greatly improving the sealing performance of the first layer to the gas injection pipe opening.

[0031] 3. By setting a top pressure head, the top pressure head presses against the concave surface of the hemispherical head and forces the hemispherical head to elastically deform, so that the outer edge of the hemispherical head can abut against the annular junction between the inner hole of the air injection pipe and the first conical surface, thereby further improving the sealing performance; and by setting a spring, when the connecting seat is tightened, the spring force is applied to the hemispherical head in advance through the top pressure head, thereby forcing the hemispherical head to elastically deform first, thereby pulling the first conical ring to move axially towards the inner hole of the air injection pipe, and the first conical ring is tightened as a whole, so that the first conical ring is flat and fits against the first conical surface in advance, creating conditions for the subsequent pressure of the conical column, and further improving the sealing performance of the first conical ring and the first conical surface. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the overall structure of Embodiment 1.

[0033] Figure 2 is a cross-sectional view of the gas injection tube in Example 1.

[0034] Figure 3 is a cross-sectional view of the gas injection pipe in Example 2.

[0035] Figure 4 is a cross-sectional view of the gas injection pipe in Example 3.

[0036] Figure 5 is a cross-sectional view of the gas injection pipe in Example 4.

[0037] Figure 6 is a magnified view of part A in Figure 5.

[0038] Figure 7 is a schematic diagram of Embodiment 4 illustrating the rotation process of the first limiting tooth relative to the second limiting tooth.

[0039] Figure 8 is a cross-sectional view of the gas injection pipe in Example 5.

[0040] Figure 9 is a cross-sectional view of the gas injection tube in Example 6.

[0041] Explanation of reference numerals in the attached drawings: 1. Rubber component; 2. Conical cylinder; 3. Inner conical cylinder; 10. Air injection pipe; 100. Voltage transformer body; 101. First conical surface; 102. Second conical surface; 11. First conical ring; 12. Second conical ring; 13. Hemispherical head; 14. Connecting part; 15. PTFE membrane; 16. First layer; 17. Second layer; 21. First conical ring sleeve; 22. Connecting seat; 23. Top 24. Pressure head; 25. Slide rod; 26. Spring; 31. Slide hole; 41. Second conical ring sleeve; 41. Internal threaded cylinder; 411. Slide groove; 412. Slider; 42. External thread; 43. Tension spring; 45. Convex ring; 46. First ring body; 461. Compression spring; 47. Second ring body; 48. First limiting tooth; 481. First guide surface; 482. Second guide surface; 49. Second limiting tooth; 491. Third guide surface. Detailed Implementation

[0042] The embodiments of this application are described in detail below, and examples of the embodiments are shown in Figures 1-9.

[0043] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Example 1

[0045] Example 1 discloses a voltage transformer based on a mixed gas, as shown in Figure 1, including a voltage transformer body 100, an injection pipe 10, and a sealing assembly. The injection pipe 10 is installed at the bottom of the voltage transformer body 100 and is vertically arranged. The housing of the voltage transformer body 100 can be an aluminum shell. The injection pipe 10 is integrally formed and connected to the housing of the voltage transformer body 100.

[0046] The voltage transformer body 100 is filled with insulating gas, which includes sulfur hexafluoride gas and nitrogen gas, and the ratio of sulfur hexafluoride gas to nitrogen gas can be 3:7.

[0047] As shown in Figure 2 (the two arrows in Figure 2 represent the axial movement direction of the conical cylinder 2 when tightened and the axial movement direction of the inner conical cylinder 3 when tightened, respectively), the outer circumferential surface of the end of the air injection pipe 10 is provided with a second conical surface 102. The diameter of the second conical surface 102 gradually increases along the direction away from the voltage transformer body 100, and the taper of the second conical surface 102 is 1:4. The inner circumferential surface of the end of the air injection pipe 10 is provided with a first conical surface 101. The diameter of the first conical surface 101 gradually increases along the direction away from the voltage transformer body 100, and the taper of the first conical surface 101 is 1:1.

[0048] The sealing assembly includes an inner conical cylinder 3, a connecting structure, a rubber component 1, and a conical column 2. The rubber component 1 includes, from the center to the edge, an integrally formed hemispherical head 13, a first conical ring portion 11, a connecting portion 14, and a second conical ring portion 12. The second conical ring portion 12 is located outside the first conical ring portion 11. The diameters of the first conical ring portion 11 and the second conical ring portion 12 gradually increase in the direction away from the voltage transformer body 100, that is, the longitudinal cross-sectional shape of the rubber component 1 is W-shaped.

[0049] The outer conical surface of the first conical ring portion 11 is attached to the first conical surface 101, the concave surface of the connecting portion 14 is attached to the port surface of the air injection pipe 10, the inner conical surface of the second conical ring portion 12 is attached to the second conical surface 102, the inner conical surface of the first conical ring portion 11 is attached to the first conical ring sleeve 21, and the outer conical surface of the second conical ring portion 12 is attached to the second conical ring sleeve 31.

[0050] To facilitate the placement of the second conical ring 31 on the outside of the gas injection pipe 10, the second conical ring 31 can be designed as a split type in half. After the two split structures are placed around the outside of the gas injection pipe 10, they can be fixed into a whole by welding or bonding.

[0051] The inner conical cylinder 3 is coaxially arranged with the air injection pipe 10. The inner conical cylinder 3 is sleeved on the outside of the air injection pipe 10. The inner conical cylinder 3 can be set as a split type in half. After the two split structures are surrounded to the outside of the air injection pipe 10, the two split structures can be fixed into a whole by welding or bonding.

[0052] The inner conical surface of the inner conical cylinder 3 is attached to the outer conical surface of the second conical ring 31.

[0053] The conical column 2 is coaxially arranged with the air injection pipe 10. A connecting seat 22 is fixed at the end of the conical column 2. The connecting seat 22 is cylindrical. The connecting structure is used to drive the connecting seat 22 and the inner conical cylinder 3 to move closer to each other along the axial direction of the air injection pipe 10, so that the conical surface of the conical column 2 fits against the inner conical surface of the first conical ring 21.

[0054] In this embodiment, the connecting structure includes an internally threaded cylinder 41 and an externally threaded thread 42. The internally threaded cylinder 41 is integrally formed at the end of the inner conical cylinder 3 and is coaxially arranged with the inner conical cylinder 3. The externally threaded thread 42 protrudes from the outer circumferential surface of the connecting seat 22, and the internal thread of the internally threaded cylinder 41 is threadedly connected to the externally threaded thread 42. Furthermore, to facilitate the rotation of the connecting seat 22, a cross groove (not shown in the figure) for a screwdriver to engage can be provided on the end face of the connecting seat 22.

[0055] During installation, first, fit the rubber part 1 onto the opening of the air injection pipe 10, ensuring that the outer conical surface of the first conical ring 11 is in contact with the first conical surface 101, and the inner conical surface of the second conical ring 12 is elastically wrapped around the second conical surface 102 (the opening of the second conical ring 12 needs to be expanded first). Then, slide the inner conical cylinder 3 and the second conical ring sleeve 31 axially, so that the inner conical surface of the inner conical cylinder 3 is in contact with the outer conical surface of the second conical ring 12 through the second conical ring sleeve 31, and then keep the inner conical cylinder 3 from rotating.

[0056] Place the first conical ring 21 on the conical column 2, and then gradually tighten the connecting seat 22. The connecting seat 22 rotates relative to the inner conical cylinder 3, causing the connecting seat 22 to move axially toward the inner conical cylinder 3. The conical column 2 presses against the inner conical surface of the first conical ring 11 through the first conical ring 21. At the same time, the tightening force will also force the inner conical surface of the inner conical cylinder 3 to further fit against the outer conical surface of the second conical ring 12 through the second conical ring 31, thereby completing the sealing installation.

[0057] In this way, through the inner conical cylinder 3, the connecting structure, the rubber part 1, and the conical column 2, the sealing area is greatly increased by the cooperation between the rubber part 1 and the opening of the air injection pipe 10. At the same time, the connecting structure drives the connecting seat 22 and the inner conical cylinder 3 to move closer to each other along the axial direction of the air injection pipe 10. The conical surface of the conical column 2 abuts against the inner conical surface of the first conical ring 11 through the first conical ring sleeve 21, so that the outer conical surface of the first conical ring 11 can be tightly fitted to the first conical surface 101, thereby achieving a seal at this part of the air injection pipe 10. The inner conical surface of the inner conical cylinder 3 abuts against the outer conical surface of the second conical ring 12 through the second conical ring sleeve 31, so that the inner conical surface of the second conical ring 12 can be tightly fitted to the second conical surface 102, thereby achieving a seal at this part of the air injection pipe 10. That is, through double-strengthened sealing, the sealing performance of the air injection pipe 10 is greatly improved.

[0058] Example 2

[0059] The difference between Example 2 and Example 1 is that, as shown in Figure 3, the connecting structure includes a tension spring 43. The tension spring 43 is parallel to the axis of the air injection pipe 10. Multiple tension springs 43 are provided and evenly arranged around the circumference of the air injection pipe 10. The two ends of the tension spring 43 are detachably connected to the inner conical cylinder 3 and the connecting seat 22, respectively. Specifically, both ends of the tension spring 43 are provided with a first hook (not shown in the figure), and the inner conical cylinder 3 and the connecting seat 22 are fixed with a second hook (not shown in the figure). The detachability is achieved by the hooking and cooperation of the first hook and the second hook.

[0060] The tension of the tension spring 43 is used to drive the connecting seat 22 and the inner conical cylinder 3 to move closer to each other along the axial direction of the air injection pipe 10, so that the connecting seat 22 and the inner conical cylinder 3 apply pressure to the first conical ring 11 and the second conical ring 12 in real time, so that the outer conical surface of the first conical ring 11 can be tightly fitted to the first conical surface 101, and the inner conical surface of the second conical ring 12 can be tightly fitted to the second conical surface 102, thereby achieving a double seal.

[0061] When the rubber part 1 expands and contracts due to heat and produces a gap, the pressure applied in real time by the connecting seat 22 and the inner conical cylinder 3 can also force the rubber part 1 to fit more closely to the opening of the air injection pipe 10 in time to fill the gap and further improve the sealing performance.

[0062] Secondly, the tension spring 43 is a detachable connection, which makes it easier to install and remove the sealing components compared to Embodiment 1.

[0063] The connection structure in this embodiment is mainly suitable for working conditions with relatively good surrounding environment.

[0064] Example 3

[0065] The difference between Example 3 and Example 1 is that, as shown in Figure 4, the rubber part 1 is divided into a first layer 16 and a second layer 17 along its own thickness direction. The first layer 16 and the second layer 17 are set separately. A PTFE membrane 15 is provided between the first layer 16 and the second layer 17. The longitudinal cross-sectional shape of the first layer 16 and the second layer 17 is W-shaped, that is, both the first layer 16 and the second layer 17 have a hemispherical head 13, a first conical ring portion 11, a connecting portion 14 and a second conical ring portion 12.

[0066] The outer conical surface of the first conical ring portion 11 of the first layer 16 is attached to the first conical surface 101, the inner conical surface of the second conical ring portion 12 of the first layer 16 is attached to the second conical surface 102, and the concave surface of the connecting portion 14 of the first layer 16 is attached to the port surface of the air injection pipe 10.

[0067] The inner conical surface of the first conical ring portion 11 of the second layer 17 is fitted with the first conical ring sleeve 21, the outer conical surface of the second conical ring portion 12 of the second layer 17 is fitted with the second conical ring sleeve 31, and the cross-section of the connecting portion 14 of the second layer 17 is arc-shaped, that is, there is a gap between the connecting portion 14 of the second layer 17 and the connecting portion 14 of the first layer 16.

[0068] By utilizing the low coefficient of friction of the PTFE membrane 15, the first layer 16 and the second layer 17 can be displaced relative to each other. When the conical column 2 and the inner conical cylinder 3 apply axial force to the first conical ring 11 and the second conical ring 12 of the second layer 17 respectively, the first conical ring 11 and the second conical ring 12 of the second layer 17 will be driven to make a short axial displacement relative to the first layer 16. This axial displacement further improves the tightness of the second layer 17 against the first layer 16, thereby greatly improving the sealing performance of the first layer 16 to the port of the air injection pipe 10.

[0069] Example 4

[0070] The difference between Embodiment 4 and Embodiment 3 is that, as shown in Figures 5, 6, and 7 (the arrow in Figure 7 indicates the tightening direction of the connecting seat 22), a compression spring 461 is coaxially sleeved on the outer circumferential surface of the internally threaded cylinder 41, a protruding ring 45 is formed on the outer circumferential surface of the internally threaded cylinder 41, and a first ring body 46 is sleeved on the internally threaded cylinder 41. The first ring body 46 is axially slidingly connected to the internally threaded cylinder 41. Specifically, the outer circumferential surface of the internally threaded cylinder 41 is provided with an axially extending groove 411, and a slider 412 is fixed on the inner circumferential surface of the first ring body 46. The slider 412 slides and engages with the groove 411. The two ends of the compression spring 461 press against the protruding ring 45 and the first ring body 46 respectively. The elastic force of the compression spring 461 is used to force the first ring body 46 to slide away from the air injection pipe 10.

[0071] The end face of the first ring body 46 is integrally formed with a plurality of first limiting teeth 48 evenly arranged in a circle. The first limiting teeth 48 are in the shape of an isosceles triangle and have a first guide surface 481 and a second guide surface 482.

[0072] A second ring body 47 is coaxially fixed on the outer circumferential surface of the connecting seat 22. The end face of the second ring body 47 is integrally formed with a plurality of second limiting teeth 49 evenly arranged in a circle. The second limiting teeth 49 are in the shape of a right triangle and have a third guide surface 491. The first limiting teeth 48 and the second limiting teeth 49 mesh with each other.

[0073] During the tightening process of the connecting seat 22, the connecting seat 22 gradually approaches the inner conical cylinder 3, that is, the second limiting tooth 49 gradually approaches the first limiting tooth 48. During this process, the tip of the second limiting tooth 49 passes through the first guide surface 481 and the second guide surface 482 of each of the first limiting teeth 48 in sequence, and the compression spring 461 is gradually compressed elastically. When the tip of the second limiting tooth 49 passes through the first guide surface 481, the third guide surface 491 is in contact with the first guide surface 481, and the compression degree of the compression spring 461 is the greatest. When the tip of the second limiting tooth 49 passes through the second guide surface 482, the compression spring 461 gradually rebounds. That is, during the tightening process of the connecting seat 22, the compression spring 461 is in a process of continuous compression and continuous rebound. In the whole process, the second limiting tooth 49 gradually approaches the first limiting tooth 48, that is, the compression amount of the compression spring 461 gradually increases, while the rebound amount gradually decreases. That is, the elastic potential energy of the compression spring 461 is in a process of accumulation.

[0074] When the node is finally tightened, the tip of the second limiting tooth 49 remains in contact with the second guide surface 482.

[0075] When the connecting seat 22 becomes loose due to thermal expansion and contraction or vibration, the elastic potential energy of the compression spring 461 will be converted into a force that forces the connecting seat 22 to tighten through the contact between the tip of the second limiting tooth 49 and the second guide surface 482, thereby greatly reducing the loosening of the connecting seat 22 and improving the sealing performance.

[0076] Example 5

[0077] The difference between Example 5 and Example 1 is that, as shown in Figure 8, a top pressure head 23 is coaxially fixed at the end of the conical column 2. The top pressure head 23 is bullet-shaped and its diameter is smaller than the inner diameter of the air injection pipe 10.

[0078] When the connecting seat 22 is tightened, the top pressure head 23 presses against the concave surface of the hemispherical head 13 and forces the hemispherical head 13 to deform elastically, so that the outer edge of the hemispherical head 13 can abut against the annular junction between the inner hole of the air injection pipe 10 and the first conical surface 101, so as to further improve the sealing performance.

[0079] Example 6

[0080] The difference between Embodiment 6 and Embodiment 5 is that, as shown in Figure 9, one end of the top pressure head 23 is coaxially fixed with a sliding rod 24, and the end of the conical column 2 is provided with a sliding hole 26. The sliding rod 24 and the sliding hole 26 slide and cooperate, thereby realizing the axial sliding connection between the top pressure head 23 and the conical column 2.

[0081] A spring 25 is provided inside the sliding hole 26. The two ends of the spring 25 abut against the end of the sliding rod 24 and the bottom of the sliding hole 26, respectively. The elastic force of the spring 25 is used to force the top pressure head 23 to slide towards the hemispherical head 13.

[0082] When the connecting seat 22 is tightened, the elastic force of the spring 25 is applied to the hemispherical head 13 (the conical column 2 is not in contact with the first conical ring 21) through the top pressure head 23, thereby forcing the hemispherical head 13 to deform elastically first, thereby pulling the first conical ring 11 to move axially toward the inner hole of the air injection pipe 10, and the first conical ring 11 is tightened as a whole, so that the first conical ring 11 is flat and fits the first conical surface 101 in advance, so as to create conditions for the subsequent pressure of the conical column 2, and further improve the sealing performance of the first conical ring 11 and the first conical surface 101.

[0083] Furthermore, when the first conical ring 11 is tightened as a whole, it will also cause the second conical ring 12 to be tightened as a whole through the connecting part 14, so that the second conical ring 12 is flat and attached to the second conical surface 102 in advance, so as to create conditions for the subsequent pressure of the inner conical cylinder 3, and further improve the sealing performance of the second conical ring 12 and the second conical surface 102.

[0084] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A voltage transformer based on a mixed gas, characterized in that, The device includes a voltage transformer body (100), an injection pipe (10), and a sealing assembly. The injection pipe (10) is integrally formed at the bottom of the voltage transformer body (100). The voltage transformer body (100) is filled with insulating gas, which includes sulfur hexafluoride gas and nitrogen gas. The outer circumferential surface of the end of the injection pipe (10) is provided with a second conical surface (102), the diameter of which gradually increases in the direction away from the voltage transformer body (100). The inner circumferential surface of the end of the injection pipe (10) is provided with a first conical surface (101), the diameter of which gradually increases in the direction away from the voltage transformer body (100). The sealing assembly includes an inner conical cylinder (3), a connecting structure, a rubber component (1), and a conical column (2). The rubber component (1) includes, from the center to the edge, a hemispherical head (13), a first conical ring (11), a connecting part (14), and a second conical ring (12). The second conical ring (12) is located outside the first conical ring (11). The diameters of both the first conical ring (11) and the second conical ring (12) gradually increase in the direction away from the voltage transformer body (100). The outer conical surface of the first conical ring (11) is attached to the first conical surface (101), and the inner conical surface of the second conical ring (12) is attached to the second conical surface (102). The inner conical surface of the first conical ring (11) is attached to a first conical sleeve (21). The outer conical surface of the second conical ring (12) is fitted with the second conical ring sleeve (31), the inner conical surface of the inner conical cylinder (3) is fitted with the outer conical surface of the second conical ring sleeve (31), and the conical surface of the conical column (2) is fitted with the inner conical surface of the first conical ring sleeve (21). The end of the conical column (2) is fixed with a connecting seat (22), and the connecting structure is used to drive the connecting seat (22) and the inner conical cylinder (3) to move closer to each other along the axial direction of the air injection pipe (10).

2. The voltage transformer based on a mixed gas according to claim 1, characterized in that, The rubber part (1) is divided into a first layer (16) and a second layer (17) along its thickness direction. A PTFE membrane (15) is provided between the first layer (16) and the second layer (17). The outer conical surface of the first conical ring (11) of the first layer (16) is attached to the first conical surface (101). The inner conical surface of the second conical ring (12) of the first layer (16) is attached to the second conical surface (102). The inner conical surface of the first conical ring (11) of the second layer (17) is attached to the first conical ring sleeve (21). The outer conical surface of the second conical ring (12) of the second layer (17) is attached to the second conical ring sleeve (31). The cross-section of the connecting part (14) of the second layer (17) is arc-shaped.

3. The voltage transformer based on a mixed gas according to claim 1 or 2, characterized in that, The connection structure includes an internally threaded cylinder (41) integrally formed on the end of the inner conical cylinder (3) and an external thread (42) protruding on the outer circumferential surface of the connecting seat (22), wherein the internal thread of the internally threaded cylinder (41) is threadedly connected to the external thread (42).

4. The voltage transformer based on a mixed gas according to claim 3, characterized in that, A compression spring (461) is coaxially sleeved on the outer circumferential surface of the internal threaded cylinder (41). A first ring body (46) is sleeved on the internal threaded cylinder (41). The first ring body (46) is axially slidably connected to the internal threaded cylinder (41). The elastic force of the compression spring (461) is used to force the first ring body (46) to slide away from the air injection pipe (10). The end face of the first ring body (46) is integrally formed with a plurality of circumferentially evenly arranged first limiting teeth (48). The first limiting teeth (48) are in the shape of an isosceles triangle and have a first guide surface (481) and a second guide surface (482). A second ring body (47) is coaxially fixed on the outer circumferential surface of the connecting seat (22). The end face of the second ring body (47) is integrally formed with a plurality of circumferentially evenly arranged second limiting teeth. (49) The second limiting tooth (49) is in the shape of a right triangle. The second limiting tooth (49) has a third guide surface (491). The first limiting tooth (48) and the second limiting tooth (49) mesh with each other. During the tightening of the connecting seat (22), the tip of the second limiting tooth (49) passes through the first guide surface (481) and the second guide surface (482) of each first limiting tooth (48) in sequence, and the compression spring (461) is gradually compressed elastically. When the tip of the second limiting tooth (49) passes through the first guide surface (481), the third guide surface (491) is attached to the first guide surface (481). When the connecting seat (22) is tightened, the tip of the second limiting tooth (49) stays in the state of abutting against the second guide surface (482).

5. The voltage transformer based on a mixed gas according to claim 1, characterized in that, The end of the conical column (2) has a pressing head (23), the diameter of which is smaller than the inner diameter of the air injection pipe (10). The pressing head (23) presses against the concave surface of the hemispherical head (13) and forces the hemispherical head (13) to deform elastically.

6. The voltage transformer based on a mixed gas according to claim 5, characterized in that, The top pressure head (23) is axially slidably connected to the conical column (2). The conical column (2) is provided with a spring (25). The elastic force of the spring (25) is used to force the top pressure head (23) to slide towards the hemispherical head (13). When the conical column (2) moves axially towards the rubber part (1) and does not abut against the first conical ring (21), the top pressure head (23) presses against the concave surface of the hemispherical head (13). The elastic force of the spring (25) is applied to the hemispherical head (13) through the top pressure head (23) to force the hemispherical head (13) to elastically deform.

7. The voltage transformer based on a mixed gas according to claim 1 or 2, characterized in that, The connection structure includes a tension spring (43), the two ends of which are detachably connected to the inner conical cylinder (3) and the connecting seat (22) respectively. The tension of the tension spring (43) is used to drive the connecting seat (22) and the inner conical cylinder (3) to move closer to each other along the axial direction of the air injection pipe (10).

8. The voltage transformer based on a mixed gas according to claim 1, characterized in that, The ratio of sulfur hexafluoride gas to nitrogen is 3:7.

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