A voltage transformer based on mixed gas

Abstract

The present application discloses a voltage transformer based on mixed gas, belonging to the technical field of voltage transformers, which includes a voltage transformer body, a gas injection pipe and a sealing assembly, wherein the gas injection pipe is integrally formed at the bottom of the voltage transformer body, and the voltage transformer body is filled with insulating gas, and the insulating gas includes sulfur hexafluoride gas and nitrogen; the sealing assembly includes an inner conical cylinder, a connecting structure, a rubber member and a conical column, wherein the rubber member includes a hemispherical head, a first conical ring part, a connecting part and a second conical ring part from the center to the edge, and the second conical ring part is located outside the first conical ring part; a connecting seat is fixed at the end of the conical column, and the connecting structure is used to drive the connecting seat and the inner conical cylinder to approach each other along the axial direction of the gas injection pipe. The present application can improve the sealing performance of the gas injection pipe.

Description

Technical Field

[0001] The present application belongs to the technical field of voltage transformers and relates to a voltage transformer based on mixed gas. Background Art

[0002] Existing voltage transformers are divided into oil-immersed insulated voltage transformers and gas-insulated voltage transformers according to different insulating media, wherein the insulating gas of the gas-insulated voltage transformer includes sulfur hexafluoride gas or a mixed gas of sulfur hexafluoride gas and nitrogen.

[0003] The gas-insulated voltage transformer has a gas injection pipe for injecting insulating gas, and is sealed by installing a sealing ring and a sealing cover at the pipe mouth of the gas injection pipe. Secondly, the purpose of setting the gas injection pipe and the sealing cover is to facilitate the opening and closing of the gas injection pipe at any time, so as to regularly sample the insulating gas in the gas-insulated voltage transformer to detect the moisture content of the insulating gas, thereby ensuring the normal use of the gas-insulated voltage transformer.

[0004] However, during the operation of the gas-insulated voltage transformer, it is affected by bad weather, the surrounding harsh environment and temperature, and the sealing ring is more likely to fail, resulting in water vapor intrusion into the voltage transformer. Summary of the invention

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

[0006] The present application provides a voltage transformer based on mixed gas, which is specifically implemented by the following technical solutions:

[0007] A voltage transformer based on mixed gas, comprising a voltage transformer body, a gas injection pipe and a sealing assembly, wherein the gas injection pipe is integrally formed at the bottom of the voltage transformer body, and the voltage transformer body is filled with insulating gas, wherein the insulating gas comprises sulfur hexafluoride gas and nitrogen; a second conical surface is arranged on the outer peripheral surface of the end of the gas injection pipe, and the diameter of the second conical surface gradually increases in a direction away from the voltage transformer body; a first conical surface is arranged on the inner peripheral surface of the end of the gas injection pipe, and the diameter of the first conical surface gradually increases in a direction away from the voltage transformer body; the sealing assembly comprises an inner conical cylinder, a connecting structure, a rubber member and a conical column, wherein the rubber member comprises a hemispherical head, a first conical ring portion, a connecting portion and The second conical ring portion is located on the outside of the first conical ring portion, and the diameters of the first conical ring portion and the second conical ring portion gradually increase in the direction away from the voltage transformer body; the outer conical surface of the first conical ring portion fits the first conical surface, and the inner conical surface of the second conical ring portion fits the second conical surface. The inner conical surface of the first conical ring portion fits with the first conical ring sleeve, and the outer conical surface of the second conical ring portion fits with the second conical ring sleeve. The inner conical surface of the inner conical cylinder fits with the outer conical surface of the second conical ring sleeve, and the conical surface of the conical column fits with the inner conical surface of the first conical ring sleeve; a connecting seat is fixed at the end of the conical column, and the connecting structure is used to drive the connecting seat and the inner conical cylinder to approach each other along the axial direction of the gas injection pipe.

[0008] Through the above technical scheme, through the inner conical cylinder, the connecting structure, the rubber part and the conical column, the sealing area is greatly increased by utilizing the cooperation between the rubber part and the pipe mouth of the air injection pipe, and at the same time, the connecting structure is utilized to drive the connecting seat and the inner conical cylinder to approach each other along the axial direction of the air injection pipe, and the conical surface of the conical column is abutted against the inner conical surface of the first conical ring part through the first conical ring sleeve, so that the outer conical surface of the first conical ring part can fit tightly against the first conical surface, thereby realizing the sealing of this part of the air injection pipe; the inner conical surface of the inner conical cylinder is abutted against the outer conical surface of the second conical ring part through the second conical ring sleeve, so that the inner conical surface of the second conical ring part can fit tightly against the second conical surface, thereby realizing the sealing of this part of the air injection pipe, that is, through double reinforced sealing, the sealing of the air injection pipe is greatly improved.

[0009] Secondly, the force components exerted by the conical column and the inner conical cylinder on the nozzle of the gas injection pipe will offset and balance each other, thereby reducing the deformation of the nozzle of the gas injection pipe.

[0010] The first conical ring sleeve and the second conical ring sleeve can evenly distribute the stress on the rubber member, thereby improving the tightness of the rubber member and the nozzle of the gas injection pipe.

[0011] Optionally, the rubber part is divided into a first layer and a second layer along its own thickness direction, a PTFE membrane is provided between the first layer and the second layer, the outer cone surface of the first cone ring portion of the first layer is fitted to the first cone surface, the inner cone surface of the second cone ring portion of the first layer is fitted to the second cone surface, the inner cone surface of the first cone ring portion of the second layer is fitted to the first cone ring sleeve, and the outer cone surface of the second cone ring portion of the second layer is fitted to the second cone ring sleeve; the cross-section of the connecting portion of the second layer is arc-shaped.

[0012] Through the above technical scheme, by setting up layered rubber parts and PTFE membranes and utilizing the low friction coefficient of the PTFE membrane, the first layer and the second layer can be relatively displaced; when the conical cylinder and the inner conical cylinder respectively apply axial components to the first cone ring portion and the second cone ring portion of the second layer, the first cone ring portion and the second cone ring portion of the second layer will be driven to make a short-distance axial displacement relative to the first layer. The axial displacement further improves the abutment tightness of the second layer to the first layer, thereby greatly improving the sealing of the first layer to the air injection pipe orifice.

[0013] The provision of the arc-shaped connecting portion allows the first cone ring portion and the second cone ring portion of the second layer to have a larger relative displacement margin.

[0014] Optionally, the connection structure includes an internal threaded barrel integrally formed at the end of the inner conical barrel and an external thread protruding from the outer peripheral surface of the connecting seat, and the internal thread of the internal threaded barrel is threadedly connected to the external thread.

[0015] Through the above technical scheme, during installation, the rubber part is firstly sleeved on the pipe mouth of the air injection pipe to ensure that the outer cone surface of the first cone ring part fits the first cone surface, and the inner cone surface of the second cone ring part is elastically wrapped around the second cone surface, and then the inner cone tube and the second cone ring sleeve are axially slid so that the inner cone surface of the inner cone tube fits the outer cone surface of the second cone ring part through the second cone ring sleeve, and then the inner cone tube is kept fixed; the first cone ring sleeve is placed on the conical column, and then the connecting seat is gradually tightened, and the connecting seat moves axially toward the inner cone tube, and the conical column is pressed against the inner cone surface of the first cone ring part through the first cone ring sleeve, and at the same time, the tightening force will also force the inner cone surface of the inner cone tube to further fit the outer cone surface of the second cone ring part through the second cone ring sleeve, thereby completing the sealing installation.

[0016] Optionally, a compression spring is coaxially sleeved on the outer circumference of the internal threaded tube, and the internal threaded tube is sleeved with a first ring body, which is axially slidingly connected to the internal threaded tube, and the elastic force of the compression spring is used to force the first ring body to slide in a direction away from the gas injection pipe, and the end face of the first ring body is integrally formed with a plurality of first limiting teeth evenly arranged in a circle, and the first limiting teeth are in the shape of an isosceles triangle, and the first limiting teeth have a first guide surface and a second guide surface; a second ring body is coaxially fixed to the outer circumference of the connecting seat, and the end face of the second ring body is integrally formed with a plurality of first limiting teeth evenly arranged in a circle The second limiting tooth is in the shape of a right-angled triangle, the second limiting tooth has a third guide surface, and the first limiting tooth and the second limiting tooth are engaged with each other; during the tightening process 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 turn, 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 attached to the first guide surface; when the connecting seat is tightened, the tip of the second limiting tooth stays in a state of abutting against the second guide surface.

[0017] Through the above technical scheme, 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, and in 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 turn, 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 attached to the first guide surface, and the compression degree of the compression spring increases, and 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, and in the overall process, the second limiting tooth gradually approaches the first limiting tooth, that is, the compression amount of the compression spring each time gradually increases, and the rebound amount gradually decreases, that is, the elastic potential energy of the compression spring is in the accumulation process.

[0018] When the node is finally tightened, the tip of the second limiting tooth stays in abutment 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 be tightened through the abutment between the tip of the second limiting tooth and the second guide surface, thereby greatly reducing the looseness of the connecting seat and improving the sealing.

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

[0020] Through the above technical solution, a top pressure head is set, which presses on the inner 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 gas injection pipe and the first conical surface to further improve the sealing performance.

[0021] Optionally, the pressing head is axially slidingly connected to the conical cylinder, and the conical cylinder is provided with a spring, and the elastic force of the spring is used to force the pressing head to slide toward the hemispherical head; when the conical cylinder moves axially toward the rubber component and does not abut against the first conical ring sleeve, the pressing head presses on the inner 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 slidable top pressure head, when starting to tighten the connecting seat, the elastic force of the spring is pre-applied to the hemispherical head through the top pressure head, thereby forcing the hemispherical head to deform elastically first, thereby pulling the first cone ring part to move axially toward the inner hole of the gas injection pipe, and the first cone ring part is tightened as a whole, so that the first cone ring part is pre-flattened and fits the first cone surface, so as to create conditions for the subsequent pressure of the conical column, and further improve the fit and sealing between the first cone ring part and the first cone surface.

[0023] Moreover, when the first cone ring portion is tightened as a whole, the second cone ring portion will also be tightened as a whole, so that the second cone ring portion is pre-flattened and fits the second cone surface, creating conditions for the subsequent pressing of the inner cone tube, and further improving the fit and sealing between the second cone ring portion and the second cone surface.

[0024] Optionally, the connection structure includes a tension spring, both ends of which are detachably connected to the inner conical cylinder and the connecting seat respectively, and the tension of the tension spring is used to drive the connecting seat and the inner conical cylinder to approach each other along the axial direction of the gas injection pipe.

[0025] Through the above technical scheme, a tension spring is set to drive the connecting seat and the inner conical cylinder to approach each other along the axial direction of the gas injection pipe, thereby realizing double sealing. 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 cone ring portion and the second cone ring portion in real time. When the rubber part expands and contracts due to heat and cold and a gap is generated, the pressure applied by the connecting seat and the inner conical cylinder in real time can also force the rubber part to fit more closely to the orifice of the gas injection pipe in time to fill the gap and further improve the sealing performance.

[0026] In addition, the tension spring is detachably connected to facilitate installation and removal of the sealing assembly.

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

[0028] The beneficial effects of this application are:

[0029] 1. Through the inner conical cylinder, the connection structure, the rubber part and the conical column, the sealing area is greatly increased by utilizing the cooperation between the rubber part and the pipe mouth of the gas injection pipe. At the same time, the connection structure is utilized to drive the connection seat and the inner conical cylinder to approach each other along the axial direction of the gas injection pipe. The conical surface of the conical column is abutted against the inner conical surface of the first conical ring part through the first conical ring sleeve, so that the outer conical surface of the first conical ring part can be closely fitted to the first conical surface, thereby realizing the sealing of this part of the gas injection pipe; the inner conical surface of the inner conical cylinder is abutted against the outer conical surface of the second conical ring part through the second conical ring sleeve, so that the inner conical surface of the second conical ring part can be closely fitted to the second conical surface, thereby realizing the sealing of this part of the gas injection pipe, that is, through double reinforced sealing, the sealing of the gas injection pipe is greatly improved;

[0030] 2. By providing a layered rubber part and a PTFE membrane, the first layer and the second layer can be relatively displaced by utilizing the low friction coefficient of the PTFE membrane; when the conical cylinder and the inner conical cylinder respectively apply axial force components to the first cone ring portion and the second cone ring portion of the second layer, the first cone ring portion and the second cone ring portion of the second layer will be driven to make a short distance axial displacement relative to the first layer, and the axial displacement further improves the abutment tightness of the second layer to the first layer, thereby greatly improving the sealing performance of the first layer to the gas injection pipe orifice;

[0031] 3. By setting a top pressure head, the top pressure head presses on the inner 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 gas injection pipe and the first conical surface, so as to further improve the sealing performance; and by setting a spring, when starting to tighten the connecting seat, the elastic force of the spring is pre-applied to the hemispherical head through the top pressure head, thereby forcing the hemispherical head to deform elastically first, thereby pulling the first conical ring part to move axially toward the inner hole of the gas injection pipe, and the first conical ring part is tightened as a whole, so that the first conical ring part is pre-flattened and fits the first conical surface, so as to create conditions for the subsequent pressing of the conical column, and further improve the fitting and sealing performance of the first conical ring part and the first conical surface. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 2 4 is a cross-sectional view of the gas injection pipe of Example 1.

[0034] Figure 3 4 is a cross-sectional view of the gas injection pipe of Example 2.

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

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

[0037] Figure 6 yes Figure 5 A partial enlarged view of point A in the middle.

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

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

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

[0041] Description of reference numerals: 1, rubber member; 2, conical column; 3, inner conical cylinder; 10, gas injection pipe; 100, voltage transformer body; 101, first conical surface; 102, second conical surface; 11, first conical ring portion; 12, second conical ring portion; 13, hemispherical head; 14, connecting portion; 15, PTFE membrane; 16, first layer; 17, second layer; 21, first conical ring sleeve; 22, connecting seat; 23, top Pressure head; 24, slide rod; 25, spring; 26, slide hole; 31, second conical ring sleeve; 41, internal threaded tube; 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 DESCRIPTION

[0042] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the attached Figure 1-Figure 9 Shown in.

[0043] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] Example 1

[0045] Embodiment 1 discloses a voltage transformer based on mixed gas, such as Figure 1As shown, it includes a voltage transformer body 100, an air injection pipe 10 and a sealing assembly. The air injection pipe 10 is installed at the bottom of the voltage transformer body 100. The air injection pipe 10 is vertically arranged. The shell of the voltage transformer body 100 can be an aluminum shell. The air injection pipe 10 is integrally connected with the shell of the voltage transformer body 100.

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

[0047] like Figure 2 As shown ( Figure 2 The directions of the two arrows are respectively the axial movement directions of the conical cylinder 2 when tightened and the axial movement directions of the inner conical cylinder 3 when tightened). The outer circumferential surface of the end of the gas injection pipe 10 is provided with a second conical surface 102, and the diameter of the second conical surface 102 gradually increases in 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 gas injection pipe 10 is provided with a first conical surface 101, and the diameter of the first conical surface 101 gradually increases in 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 member 1 and a conical column 2, wherein the rubber member 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 being located on the outside of the first conical ring portion 11, and the diameters of the first conical ring portion 11 and the second conical ring portion 12 gradually increase in a direction away from the voltage transformer body 100, that is, the longitudinal cross-section of the rubber member 1 is in a W-shape.

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

[0050] In order to facilitate the second conical ring sleeve 31 to be installed on the outside of the gas injection pipe 10, the second conical ring sleeve 31 can be set to be a split type in half. After the two split structures are surrounded to the outside of the gas injection pipe 10, the two split structures can be fixed into a whole by welding or bonding.

[0051] The inner conical cylinder 3 is coaxially arranged with the gas injection pipe 10, and the inner conical cylinder 3 is sleeved on the outside of the gas injection pipe 10. The inner conical cylinder 3 can be arranged as a split type in half. After the two split structures are surrounded to the outside of the gas 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 fits the outer conical surface of the second conical ring sleeve 31 .

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

[0054] In this embodiment, the connection structure includes an internal thread barrel 41 and an external thread 42, wherein the internal thread barrel 41 is integrally formed at the end of the inner tapered barrel 3, the internal thread barrel 41 is coaxially arranged with the inner tapered barrel 3, the external thread 42 protrudes from the outer peripheral surface of the outer peripheral surface of the connecting seat 22, and the internal thread of the internal thread barrel 41 is threadedly connected with the external thread 42. In addition, in order to facilitate the rotation of the connecting seat 22, a cross groove (not shown in the figure) for a screwdriver to cooperate with can be provided on the end surface of the connecting seat 22.

[0055] During installation, first put the rubber part 1 on the pipe mouth of the air injection pipe 10, ensure that the outer cone surface of the first cone ring part 11 fits against the first cone surface 101, and the inner cone surface of the second cone ring part 12 is elastically wrapped around the second cone surface 102 (the opening of the second cone ring part 12 needs to be enlarged first), and then axially slide the inner cone tube 3 and the second cone ring sleeve 31, so that the inner cone surface of the inner cone tube 3 fits against the outer cone surface of the second cone ring part 12 through the second cone ring sleeve 31, and then keep the inner cone tube 3 from rotating.

[0056] Place the first conical ring sleeve 21 on the conical cylinder 2, and then gradually tighten the connecting seat 22. The connecting seat 22 rotates relative to the inner conical cylinder 3, so that the connecting seat 22 moves axially toward the inner conical cylinder 3. The conical cylinder 2 is pressed against the inner conical surface of the first conical ring part 11 through the first conical ring sleeve 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 part 12 through the second conical ring sleeve 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 cylinder 2, the sealing area is greatly increased by utilizing the cooperation between the rubber part 1 and the pipe mouth of the air injection pipe 10, and at the same time, the connecting structure is utilized to drive the connecting seat 22 and the inner conical cylinder 3 to approach each other along the axial direction of the air injection pipe 10, and the conical surface of the conical cylinder 2 is abutted against the inner conical surface of the first conical ring part 11 through the first conical ring sleeve 21, so that the outer conical surface of the first conical ring part 11 can fit tightly against the first conical surface 101, thereby achieving the sealing of this part of the air injection pipe 10; the inner conical surface of the inner conical cylinder 3 is abutted against the outer conical surface of the second conical ring part 12 through the second conical ring sleeve 31, so that the inner conical surface of the second conical ring part 12 can fit tightly against the second conical surface 102, thereby achieving the sealing of this part of the air injection pipe 10, that is, through double reinforced sealing, the sealing of the air injection pipe 10 is greatly improved.

[0058] Example 2

[0059] The difference between Example 2 and Example 1 is that Figure 3 As shown, the connection structure includes a tension spring 43, which is parallel to the axis of the gas injection tube 10. The tension spring 43 is provided in plurality and is evenly arranged around the gas injection tube 10. The two ends of the tension spring 43 are respectively detachably connected to the inner conical tube 3 and the connecting seat 22. Specifically, both ends of the tension spring 43 are provided with a first hook (not shown in the figure), and the inner conical tube 3 and the connecting seat 22 are fixed with a second hook (not shown in the figure), and the first hook and the second hook are hooked together to achieve detachability.

[0060] The tension of the tension spring 43 is used to drive the connecting seat 22 and the inner conical cylinder 3 to approach each other axially along the gas injection pipe 10, so that the connecting seat 22 and the inner conical cylinder 3 apply pressure to the first conical ring portion 11 and the second conical ring portion 12 in real time, so that the outer conical surface of the first conical ring portion 11 can fit tightly against the first conical surface 101, and the inner conical surface of the second conical ring portion 12 can fit tightly against the second conical surface 102, thereby achieving double sealing.

[0061] When the rubber member 1 expands and contracts to produce a gap, the real-time pressure applied by the connecting seat 22 and the inner conical tube 3 can also force the rubber member 1 to fit more closely to the nozzle of the gas 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. Compared with the embodiment 1, this structure is more convenient for the installation and disassembly of the sealing assembly.

[0063] The connection structure of 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 Figure 4 As shown, the rubber member 1 is divided into a first layer 16 and a second layer 17 along its thickness direction. The first layer 16 and the second layer 17 are separately arranged. A PTFE membrane 15 is arranged between the first layer 16 and the second layer 17. The longitudinal cross-section of the first layer 16 and the second layer 17 is W-shaped, that is, the first layer 16 and the second layer 17 both 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 fits the first conical surface 101 , the inner conical surface of the second conical ring portion 12 of the first layer 16 fits the second conical surface 102 , and the inner concave surface of the connecting portion 14 of the first layer 16 fits the port surface of the gas 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 friction coefficient of the PTFE membrane 15, the first layer 16 and the second layer 17 can be relatively displaced. When the conical cylinder 2 and the inner conical cylinder 3 respectively apply axial components to the first cone ring portion 11 and the second cone ring portion 12 of the second layer 17, the first cone ring portion 11 and the second cone ring portion 12 of the second layer 17 will be driven to make a short-distance axial displacement relative to the first layer 16. The axial displacement further improves the abutment tightness of the second layer 17 to the first layer 16, thereby greatly improving the sealing performance of the first layer 16 to the nozzle of the gas injection pipe 10.

[0069] Example 4

[0070] The difference between Example 4 and Example 3 is that Figure 5 , Figure 6 , Figure 7 As shown ( Figure 7 The direction of the middle arrow is the tightening direction of the connecting seat 22), a compression spring 461 is coaxially sleeved on the outer circumference of the internal threaded tube 41, a convex ring 45 is protruded from the outer circumference of the internal threaded tube 41, and a first ring body 46 is sleeved on the internal threaded tube 41. The first ring body 46 is axially slidably connected to the internal threaded tube 41. Specifically, an axially extending slide groove 411 is provided on the outer circumference of the internal threaded tube 41, and a slider 412 is fixed on the inner circumference of the first ring body 46. The slider 412 is slidably matched with the slide groove 411, and the two ends of the compression spring 461 are respectively pressed against the convex ring 45 and the first ring body 46, and the elastic force of the compression spring 461 is used to force the first ring body 46 to slide in the direction away from the gas injection tube 10.

[0071] The end surface of the first ring body 46 is integrally formed with a plurality of first limiting teeth 48 evenly arranged around the circumference. 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 to the outer circumferential surface of the connecting seat 22, and a plurality of second limiting teeth 49 evenly arranged circumferentially are integrally formed on the end surface of the second ring body 47. The second limiting teeth 49 are in the shape of a right-angled triangle, and the second limiting teeth 49 have a third guide surface 491. The first limiting teeth 48 and the second limiting teeth 49 are engaged 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, and in 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 first limiting tooth 48 in sequence, and the compression spring 461 is gradually elastically compressed; 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, and the compression degree of the compression spring 461 is increased, and 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, and in the overall process, the second limiting tooth 49 gradually approaches the first limiting tooth 48, that is, the compression amount of the compression spring 461 each time gradually increases, and the rebound amount gradually decreases, that is, the elastic potential energy of the compression spring 461 is in the accumulation process.

[0074] When the node is finally tightened, the tip of the second limiting tooth 49 stays in a state of abutting against the second guide surface 482 .

[0075] When the connecting seat 22 becomes loose due to thermal expansion, 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 be tightened through the abutment between the tip of the second limiting tooth 49 and the second guide surface 482, thereby greatly reducing the looseness of the connecting seat 22 and improving the sealing performance.

[0076] Example 5

[0077] The difference between Example 5 and Example 1 is that Figure 8 As shown, a pressing head 23 is coaxially fixed to the end of the conical column 2 . The pressing head 23 is in the shape of a bullet head, and the diameter of the pressing head 23 is smaller than the inner diameter of the gas injection pipe 10 .

[0078] When tightening the connecting seat 22, the pressing head 23 presses against the inner 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 gas injection pipe 10 and the first cone surface 101 to further improve the sealing performance.

[0079] Example 6

[0080] The difference between Example 6 and Example 5 is that Fig. 9 As shown, a slide rod 24 is coaxially fixed to one end of the ram 23, and a slide hole 26 is provided at the end of the conical column 2. The slide rod 24 and the slide hole 26 are slidably matched, thereby realizing an axial sliding connection between the ram 23 and the conical column 2.

[0081] A spring 25 is provided in the sliding hole 26 , and 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 pressing head 23 to slide toward the hemispherical head 13 .

[0082] When starting to tighten the connecting seat 22, the elastic force of the spring 25 is pre-applied to the hemispherical head 13 (the conical column 2 does not abut the first conical ring sleeve 21) through the top pressure head 23, thereby forcing the hemispherical head 13 to deform elastically first, thereby pulling the first conical ring portion 11 to move axially toward the inner hole of the gas injection pipe 10, and the first conical ring portion 11 is tightened as a whole, so that the first conical ring portion 11 is pre-flattened and fits the first conical surface 101, so as to create conditions for the subsequent pressing of the conical column 2, and further improve the fit and sealing between the first conical ring portion 11 and the first conical surface 101.

[0083] Moreover, when the first cone ring portion 11 is tightened as a whole, the second cone ring portion 12 will also be tightened as a whole through the connecting portion 14, so that the second cone ring portion 12 is pre-flattened and fits the second cone surface 102, thereby creating conditions for the subsequent pressing of the inner cone tube 3, and further improving the fit and sealing between the second cone ring portion 12 and the second cone surface 102.

[0084] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

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

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

3. The mixed gas-based voltage transformer according to claim 1 or 2, characterized in that: The connection structure comprises an internal threaded cylinder (41) integrally formed at the end of the inner conical cylinder (3) and an external thread (42) protruding from the outer peripheral surface of the connection seat (22), and the internal thread of the internal threaded cylinder (41) is threadedly connected to the external thread (42).

4. The mixed gas-based voltage transformer according to claim 3, characterized in that: The outer circumferential surface of the internal threaded tube (41) is coaxially sleeved with a compression spring (461), and the internal threaded tube (41) is sleeved with a first ring body (46), and the first ring body (46) is axially slidingly connected to the internal threaded tube (41), and the elastic force of the compression spring (461) is used to force the first ring body (46) to slide in a direction away from the gas injection pipe (10), and the end face of the first ring body (46) is integrally formed with a plurality of first limiting teeth (48) evenly arranged around the circumference, and the first limiting teeth (48) are in the shape of an isosceles triangle, and the first limiting teeth (48) have a first guide surface (481) and a second guide surface (482); the outer circumferential surface of the connecting seat (22) is coaxially fixed with a second ring body (47), and the end face of the second ring body (47) is integrally formed with a plurality of second limiting teeth evenly arranged around the circumference. (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) are meshed with each other; during the tightening process 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 turn, and the compression spring (461) is gradually elastically compressed; 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); when the connecting seat (22) is tightened, the tip of the second limiting tooth (49) stays in a state of abutting against the second guide surface (482).

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

6. The mixed gas-based voltage transformer according to claim 5, characterized in that: The pressing head (23) is axially slidably connected to the conical column (2), and the conical column (2) is provided with a spring (25). The elastic force of the spring (25) is used to force the pressing head (23) to slide toward the hemispherical head (13); when the conical column (2) moves axially toward the rubber component (1) and does not abut against the first conical ring sleeve (21), the pressing head (23) presses against the inner concave surface of the hemispherical head (13), and the elastic force of the spring (25) is applied to the hemispherical head (13) through the pressing head (23) to force the hemispherical head (13) to elastically deform.

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

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

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