A gas supplement device for micro-positive pressure common-tank bus

Abstract

The application discloses a kind of air supplementing devices for micro-positive pressure co-box bus, comprising: air source, with the buffer tank of high pressure can be carried, so that water vapor in air can be preliminary condensation separation;Pipeline is used to guide high pressure gas in buffer tank into co-box bus, valve seat is provided at pipeline;Drying assembly has shell, drying agent is loaded in shell, neck of shell is inserted with downwardly extending air inlet pipe, valve seat is provided with first one-way valve communicated with buffer tank and second one-way valve communicated with co-box bus;Valve seat has cavity in its interior, shell is configured to hold first one-way valve when connected at valve seat, so that high pressure gas in buffer tank enters shell through air inlet pipe, after drying through drying agent, it flows into cavity through first through hole of shell neck, and flows into co-box body through second one-way valve.The air supplementing device for micro-positive pressure co-box bus has the beneficial effects of small amount of drying agent, reliable sealing, convenient maintenance.

Description

Technical Field

[0001] This invention relates to the field of power transmission and distribution equipment technology, specifically to a gas replenishment device for a micro-positive pressure common busbar. Background Technology

[0002] Enclosed busbars are key equipment in high-voltage power transmission and distribution systems. Their main body is a sealed metal enclosure, where insulators enclose the three-phase busbar conductors within a single cavity, forming a highly protected enclosed transmission structure. During operation, humid external air can easily penetrate and form condensation inside, leading to a decrease in the busbar's insulation performance and potentially causing faults such as insulation flashover.

[0003] The existing dehumidification and drying technology for shared busbars mainly employs two types of techniques: The first type is direct adsorption drying technology: this involves using an external drying device to adsorb and dehumidify the gas entering the busbar using a desiccant. This type of device requires an integrated gas source, a large drying chamber, piping, and control valve assembly, resulting in a complex overall structure, a bulky drying chamber, and a large footprint. Furthermore, the desiccant needs to be replaced once saturated, but the drying cylinder is often connected to the valve body and piping via flanges or threads, requiring specialized tools for disassembly and assembly, making disassembly cumbersome, and potentially damaging the sealing structure during disassembly, leading to a failure of the slight positive pressure inside the busbar.

[0004] The second type is hot air drying (hot air maintenance) technology: a combination of fan and heater is used to introduce high-temperature hot air into the busbar to reduce the relative humidity of the internal air by raising the temperature, thus achieving dehumidification. This method has lower requirements for busbar sealing, but it has obvious drawbacks: the hot air only increases the air temperature and does not fundamentally remove moisture. Re-condensation is still likely after the machine is shut down and cooled down, and it can easily lead to excessively high temperatures inside the coaxial enclosure. Summary of the Invention

[0005] To overcome the above-mentioned shortcomings in the prior art, the present invention provides a micro-positive pressure common busbar air supply device with low desiccant consumption, reliable sealing, and convenient maintenance.

[0006] The technical solution of this invention is as follows: A micro-positive pressure common busbar air supply device includes: The air source has a buffer tank capable of withstanding high pressure, so that water vapor in the air can be initially condensed and separated. A pipeline is used to introduce the high-pressure gas in the buffer tank into the common busbar, and a valve seat is provided at the pipeline. A drying assembly has a housing containing a desiccant, an air inlet pipe extending downwards is inserted into the neck of the housing, and a first one-way valve communicating with the buffer tank and a second one-way valve communicating with the common busbar are provided at the valve seat. The valve seat has an internal cavity. The housing is configured such that when connected to the valve seat, the air inlet pipe holds a first one-way valve, allowing high-pressure gas in the buffer tank to enter the housing through the air inlet pipe, be dried by a desiccant, flow into the cavity through the first through hole in the neck of the housing, and then flow into the common tank through the second one-way valve.

[0007] Preferably, both the first check valve and the second check valve are spring-loaded valve plates. The top of the air intake pipe is provided with a protrusion, and the side wall of the air intake pipe is provided with a first sealing gasket. The bottleneck of the housing is provided with a second sealing gasket. When the housing is assembled at the valve seat, the protrusion and the valve plate of the first one-way valve abut against each other, so that the first one-way valve is in the open state. The first sealing gasket and the mounting port of the first one-way valve at the valve seat form a seal, so that high-pressure gas is introduced into the desiccant through the air intake pipe. The second sealing gasket and the mounting port of the housing at the valve seat form a seal.

[0008] In any of the above embodiments, it is preferred that the housing is a split type, including an upper housing and a lower housing, and the upper housing and the lower housing are detachably connected.

[0009] In any of the above embodiments, it is preferred that a bracket is provided at the split part of the lower part of the shell, and the bracket is used to support the desiccant; A hollow conduit is provided at the bracket. When the air inlet pipe is assembled at the top of the housing, the air inlet pipe extends through the hollow conduit to the bottom of the bracket, so that the air entering the housing passes upward from the bottom of the desiccant.

[0010] In any of the above embodiments, it is preferred that a third sealing gasket is provided on the outer wall of the air intake pipe, and the third sealing gasket and the hollow conduit are sealed together to prevent gas bypass.

[0011] In any of the above embodiments, it is preferred that the body of the bracket is a centrally located annular protrusion structure to eliminate wall channeling between the desiccant and the inner wall of the lower housing, and between the desiccant and the outer wall of the hollow conduit.

[0012] In any of the above embodiments, it is preferred that the second sealing gasket and the housing neck are axially floatingly fitted, and the housing neck is fitted with a second spring, which provides elastic force to provide elastic force when the housing and the valve seat are connected so that the second sealing gasket is tightly attached to the valve seat.

[0013] In any of the above embodiments, it is preferred that the second sealing gasket has a flexible structure, the second sealing gasket is snapped into the mounting base, and the second sealing gasket protrudes outward from the upper surface of the mounting base. When the housing is installed at the valve seat, the second sealing gasket is squeezed to make it fit tightly against the neck of the housing.

[0014] In any of the above embodiments, it is preferred that the upper edge of the second sealing gasket is chamfered.

[0015] In any of the above embodiments, it is preferred that a pressure regulating valve is also provided at the pipeline between the second one-way valve and the common tank body.

[0016] The micro-positive pressure common busbar gas supply device of the present invention has a high-pressure buffer tank at the gas source. The high-pressure environment can cause the water vapor in the gas to condense and separate initially, reducing the water vapor content entering the drying component, thereby reducing the desiccant load and achieving a small amount of desiccant used.

[0017] The drying component is installed at the valve seat. During assembly, the air inlet pipe directly presses against the first one-way valve to achieve conduction. At the same time, with the sealing structure between the housing and the valve seat, a sealed passage can be formed without additional complex connecting parts. The assembly and disassembly are simple and quick, ensuring reliable sealing and convenient maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of the micro-positive pressure common busbar air supply device of the present invention.

[0019] Figure 2 This is a schematic diagram of an embodiment of the connection between the housing, pipes, and valve seat of the micro-positive pressure common busbar air supply device of the present invention.

[0020] Figure 3 This is a schematic diagram of an optional embodiment of the housing of the micro-positive pressure common busbar air supply device of the present invention.

[0021] Figure 4 for Figure 2 A cross-sectional view of the embodiment shown.

[0022] Figure 5 This is a schematic diagram of a preferred embodiment of the support plate of the micro-positive pressure common busbar air supply device of the present invention.

[0023] Figure 6 This is a schematic diagram of a preferred embodiment of the gas supply device for micro-positive pressure common busbars of the present invention, showing the cooperation between the second sealing gasket and the housing.

[0024] Explanation of the labels in the diagram: 101-Valve seat; 102-Housing; 103-Buffer tank; 104-Second through hole; 105-First sealing gasket; 106-Inlet pipe; 107-First through hole; 108-Second sealing gasket; 109-Third sealing gasket; 110-Hollow conduit; 111-Bracket; 112-Mounting base; 113-Second spring; 114-Common busbar enclosure. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Example 1: The micro-positive pressure common enclosure busbar adopts a closed enclosure structure. The enclosure contains busbar conductors, insulation support components, and other parts. The enclosure is a sealed cavity structure. During use, dry and clean gas needs to be filled into the enclosure to maintain a micro-positive pressure environment inside the enclosure. This prevents external humid air, dust, rain, snow, etc. from entering the enclosure, avoids degradation of busbar insulation performance, and ensures long-term safe and stable operation of the common enclosure busbar.

[0028] like Figure 1 As shown, the gas replenishment device in this embodiment includes a gas source, a pipeline, a valve seat 101, and a drying component.

[0029] The gas source has a buffer tank 103 capable of carrying high-pressure gas. The buffer tank 103 is a pressure tank structure. After the outside air is compressed, it enters the interior of the buffer tank 103. When the humid air in the environment is suddenly pressurized, the water vapor partial pressure of the air rises rapidly. When it exceeds the saturated vapor pressure at that pressure and temperature, the gaseous water exceeds the saturation limit and undergoes a phase change and condenses, changing from a gaseous state to a liquid water droplet, and settles in the buffer tank 103, thereby achieving the initial separation of water vapor and air. The buffer tank 103 is connected to the enclosed enclosure of the common busbar via a pipe, so that the high-pressure gas in the buffer tank 103, which has undergone preliminary dehumidification, can be introduced into the common busbar enclosure 114. A valve seat 101 is provided on the pipe connecting the buffer tank 103 and the common busbar enclosure 114. The valve seat 101 serves as the mounting base for the drying assembly.

[0030] like Figure 2 , 3 As shown in Figure 4, the drying assembly has a housing 102 containing a desiccant for deep drying of pre-dehumidified compressed air. A downwardly extending air inlet pipe 106 is inserted into the neck of the housing 102 to introduce high-pressure gas into the housing 102. When the air inlet pipe 106 is inserted into the neck of the housing 102, a clearance fit is made between the air inlet pipe 106 and the inner wall of the neck of the housing 102, allowing the deeply dried air to flow out through the first through-hole 107 in the neck of the housing 102 during operation.

[0031] A first check valve and a second check valve are provided at valve seat 101. The first check valve is connected to buffer tank 103, and the second check valve is connected to common busbar enclosure 114. As a preferred structure, both the first and second check valves adopt a spring-loaded valve plate structure. The valve seat 101 has a cavity for gas flow. The housing 102 is configured such that when it is connected and installed at valve seat 101, the air inlet pipe 106 can push the first check valve upward, keeping the first check valve in the open state.

[0032] This structure enables effective communication between the gas source, drying components, and the common busbar, ensuring smooth delivery of drying gas into the busbar enclosure. Furthermore, when the desiccant is replaced, the first one-way valve automatically closes under the action of its own first spring, preventing high-pressure gas leakage from the buffer tank 103 and ensuring that gas supply remains uninterrupted and does not affect the system's slightly positive pressure state during desiccant replacement.

[0033] like Figure 3 , 4As shown, as a specific optional form of the intake pipe 106, the top of the intake pipe 106 is provided with a protrusion, and a second through hole 104 is opened at the position of the protrusion. When the housing 102 is installed on the valve seat 101, the protrusion at the top of the intake pipe 106 abuts against the valve plate of the first one-way valve, opening the first one-way valve. The high-pressure gas in the buffer tank 103 enters the interior of the intake pipe 106 through the first one-way valve and the second through hole 104 of the protrusion in sequence, and flows downward into the interior of the housing 102 through the intake pipe 106. The gas passes through the desiccant from bottom to top inside the housing 102. After being deeply dried by the desiccant, it flows out through the first through hole 107 opened at the neck position of the housing 102, enters the cavity inside the valve seat 101, then flows out of the valve seat 101 through the second one-way valve, and finally enters the closed box of the common busbar, realizing micro-positive pressure gas replenishment.

[0034] To ensure reliable gas path sealing, a first sealing gasket 105 is provided on the side wall of the intake pipe 106, and a second sealing gasket 108 is provided on the neck of the housing 102. When the housing 102 is assembled on the valve seat 101, the first sealing gasket 105 forms a sealing fit with the mounting port of the first one-way valve on the valve seat 101, and the second sealing gasket 108 forms a sealing fit with the mounting port of the housing 102 on the valve seat 101, preventing gas leakage at the assembly gap.

[0035] Furthermore, in this embodiment, a pressure regulating valve is also provided on the pipeline between the second one-way valve and the common busbar enclosure 114. The pressure regulating valve can adopt a conventional spring diaphragm type pressure regulating structure. By adjusting the set pressure of the pressure regulating valve, the gas pressure entering the common busbar enclosure 114 is stabilized within the required micro-positive pressure range to ensure stable operating pressure of the common busbar.

[0036] Using the high humidity environment of Huaneng Hegang Power Plant in July and August as the test background, the relative humidity of the ambient air is about 80-90%. An air humidity sensor is installed inside the enclosed enclosure of the common busbar to continuously monitor the relative humidity of the gas inside the enclosure online.

[0037] During the experiment, the relative humidity inside the box during stable operation was recorded by adjusting the pressure of buffer tank 103, the slight positive pressure inside the busbar box, the amount of desiccant and the replacement cycle, in order to verify the drying effect of the device.

[0038] When the humidity sensor detects that the relative humidity inside the enclosure reaches 20%RH, it determines that the desiccant needs to be replaced to ensure that the inside of the common busbar is always in a safe and dry operating environment. The results of the four sets of experiments are as follows: Group 1 The pressure of buffer tank 103 is set to 0.6 MPa, the slight positive pressure inside the common busbar enclosure 114 is controlled at 250 Pa, and 5 kg of color-changing silica gel desiccant is filled inside the shell 102. By adopting a maintenance method of replacing it every 4 days, the relative humidity inside the common busbar enclosure 114 can be stably controlled below 15%RH.

[0039] Group 2 The pressure of the buffer tank 103 is set to 0.7MPa, the slight positive pressure inside the common busbar enclosure 114 is controlled at 250 Pa, and 5 kg of color-changing silica gel desiccant is filled inside the shell 102. By adopting a maintenance method of replacing it every 4 days, the relative humidity inside the common busbar enclosure 114 can be stably controlled below 12%RH.

[0040] Group 3 The pressure of buffer tank 103 is set to 0.7 MPa, the slight positive pressure inside the common busbar enclosure 114 is controlled at 300 Pa, and 5 kg of color-changing silica gel desiccant is filled inside the shell 102. By adopting a maintenance method of replacing it every 3 days, the relative humidity inside the common busbar enclosure 114 can be stably controlled below 10%RH.

[0041] Group 4 The pressure of buffer tank 103 is set to 0.8MPa, the slight positive pressure inside the common busbar enclosure 114 is controlled at 300 Pa, and 5 kg of color-changing silica gel desiccant is filled inside the shell 102. By adopting a maintenance method of replacing it every 3 days, the relative humidity inside the common busbar enclosure 114 can be stably controlled below 8%RH.

[0042] Example 2: Based on Example 1, such as Figure 3 , 4 As shown, the air supply device for the micro-positive pressure common busbar in this embodiment is the same as that in Embodiment 1 in all other aspects, except that the housing 102 of the drying component adopts a split structure. The housing 102 includes an upper housing and a lower housing, which are connected by threads to achieve detachable assembly, thereby facilitating the filling, maintenance and replacement of the desiccant.

[0043] In this embodiment, a bracket 111 is provided near the bottom of the lower part of the housing 102. The bracket 111 is used to support the desiccant inside the housing 102. A hollow conduit 110 is integrally provided at the center of the bracket 111. The hollow conduit 110 extends axially along the housing 102 and serves to guide and position the insertion and installation of the air inlet pipe 106. It also prevents the desiccant from leaking into the bottom of the bracket 111 when it is filled. The air inlet pipe 106 is inserted from top to bottom into the neck of the housing 102, passes through the hollow conduit 110, and extends to the bottom of the bracket 111. With this structure, the high-pressure gas entering the housing 102 through the air inlet pipe 106 can pass upward through the desiccant from the bottom of the bracket 111, ensuring sufficient contact between the gas and the desiccant and improving the drying effect.

[0044] In this embodiment, to prevent gas from bypassing the gap between the inlet pipe 106 and the hollow conduit 110 and directly entering the housing of the common busbar, a third sealing gasket 109 is provided around the outer wall of the inlet pipe 106. The third sealing gasket 109 is an annular sealing gasket structure, which surrounds the outer periphery of the inlet pipe 106. When the inlet pipe 106 and the hollow conduit 110 are assembled, the third sealing gasket 109 and the inner wall of the hollow conduit 110 form an interference fit, thereby sealing the gap between the inlet pipe 106 and the hollow conduit 110. This ensures that the gas entering the housing 102 can only pass through the desiccant from bottom to top, and will not flow out directly from the gap between the inlet pipe 106 and the hollow conduit 110, thus ensuring sufficient and reliable drying.

[0045] Example 3: Based on Embodiment 1 or 2, since the desiccant and the inner wall of the lower shell, and the desiccant and the outer wall of the hollow conduit 110 are different contact surfaces, gap channels are easily formed between them. During the flow process, the gas will preferentially flow along the gap channels with less resistance, forming wall grooves, which prevents the gas from passing through the desiccant evenly and affects the drying effect.

[0046] In this embodiment, as Figure 5 As shown, the bracket 111 body is configured as a ring-shaped protrusion structure along the center. This ring-shaped protrusion eliminates the gaps between the desiccant and the inner wall of the housing 102, and between the desiccant and the outer wall of the hollow duct 110, thereby avoiding the generation of wall channeling. It can better guide the airflow to pass through the central region of the desiccant, so that the gas and the desiccant can fully contact each other, ensuring that the drying is sufficient and uniform.

[0047] Example 4: Based on any of the embodiments in Examples 1-3, the difference in this embodiment lies in the way the neck of the housing 102 and the second sealing gasket 108 are fitted together.

[0048] Since there will inevitably be axial spacing error between the first sealing gasket 105 at the side wall of the intake pipe 106 and the second sealing gasket 108 at the neck of the housing 102 during processing and assembly, a floating sealing structure is adopted in this embodiment to ensure that the second sealing gasket 108 can achieve reliable sealing after installation.

[0049] like Figure 6 As shown, the neck of the housing 102 and the second sealing gasket 108 are axially floating. The neck of the housing 102 is fitted with a second spring 113, which provides axial preload. When the housing 102 is connected and assembled with the valve seat 101, the second sealing gasket 108 is driven to always be in close contact with the sealing mating surface of the valve seat 101 to compensate for machining and assembly errors and ensure stable and reliable sealing.

[0050] The second sealing gasket 108 has a flexible structure. It is snapped into the groove of the mounting base 112 and protrudes upward from the upper surface of the mounting base 112. When the housing 102 is installed on the valve seat 101, the second sealing gasket 108 is compressed and undergoes elastic deformation, causing its upper surface to fit tightly against the upper end face of the mounting base 112, and its sidewall to fit tightly against the outer wall of the neck of the housing 102. Through the combination of end face sealing and radial sealing, effective sealing of the gas passage is achieved.

[0051] In this embodiment, the upper edge of the second sealing gasket 108 is chamfered. This chamfered structure makes the projected area of ​​the protruding part of the second sealing gasket 108 smaller than the opening area of ​​the slot at the mounting base 112 that holds the second sealing gasket 108. This ensures that the second sealing gasket 108 has sufficient deformation space when squeezed, and can be fully compressed and tightly attached to the sealing mating surface.

[0052] The above-described embodiments are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gas supply device for a micro-positive pressure common busbar, characterized in that, include: The air source has a buffer tank (103) capable of withstanding high pressure, so that water vapor in the air can be initially condensed and separated; A pipe is provided to introduce high-pressure gas from the buffer tank (103) into the common busbar, and a valve seat (101) is provided at the pipe. The drying assembly has a housing (102) containing a desiccant, and a downwardly extending air inlet pipe (106) inserted into the neck of the housing (102). A first one-way valve communicating with a buffer tank (103) and a second one-way valve communicating with the common busbar are provided at the valve seat (101). The valve seat (101) has a cavity inside. The housing (102) is configured such that when connected to the valve seat (101), the air inlet pipe (106) holds the first one-way valve, so that the high-pressure gas in the buffer tank (103) enters the housing (102) through the air inlet pipe (106), is dried by the desiccant, flows into the cavity through the first through hole (107) in the neck of the housing (102), and flows into the common tank through the second one-way valve.

2. The air supply device for a micro-positive pressure common busbar as described in claim 1, characterized in that, Both the first check valve and the second check valve are spring-loaded valve plate structures; The top of the air inlet pipe (106) is provided with a protrusion, and the side wall of the air inlet pipe (106) is provided with a first sealing gasket (105). The bottleneck of the housing (102) is provided with a second sealing gasket (108). When the housing (102) is assembled at the valve seat (101), the protrusion and the valve plate of the first one-way valve abut against each other, so that the first one-way valve is in the open state. The first sealing gasket (105) and the mounting port of the first one-way valve at the valve seat (101) form a seal, so that the high pressure gas is introduced into the desiccant through the air inlet pipe (106). The second sealing gasket (108) and the mounting port of the housing (102) at the valve seat (101) form a seal.

3. The air supply device for a micro-positive pressure common busbar as described in claim 1 or 2, characterized in that, The housing (102) is a split type, including an upper housing and a lower housing, and the upper housing and the lower housing are detachably connected.

4. The air supply device for a micro-positive pressure common busbar as described in claim 3, characterized in that, A bracket (111) is provided at the split part of the lower part of the shell (102), and the bracket (111) is used to support the desiccant; A hollow conduit (110) is provided at the bracket (111). When the air inlet pipe (106) is assembled at the top of the housing (102), the air inlet pipe (106) extends through the hollow conduit (110) to the bottom of the bracket (111) so that the air entering the housing (102) passes upward through the bottom of the desiccant.

5. The air supply device for a micro-positive pressure common busbar as described in claim 4, characterized in that, A third sealing gasket (109) is provided on the outer wall of the air intake pipe (106). The third sealing gasket (109) and the hollow conduit (110) are sealed together to prevent gas bypass.

6. The air supply device for a micro-positive pressure common busbar as described in claim 4, characterized in that, The body of the bracket (111) is a ring-shaped protrusion structure along the center to eliminate wall grooves between the desiccant and the inner wall of the lower shell, and between the desiccant and the outer wall of the hollow conduit (110).

7. The air supply device for a micro-positive pressure common busbar as described in claim 1, characterized in that, The second sealing gasket (108) and the neck of the housing (102) are axially floatingly fitted. The neck of the housing (102) is fitted with a second spring (113). The second spring (113) provides elastic force to provide elastic force when the housing (102) and the valve seat (101) are connected so that the second sealing gasket (108) is tightly attached to the valve seat (101).

8. The air supply device for a micro-positive pressure common busbar as described in claim 2, characterized in that, The second sealing gasket (108) is a flexible structure. The second sealing gasket (108) is locked in the mounting base (112) and the second sealing gasket (108) protrudes outward from the upper surface of the mounting base (112). When the housing (102) is installed in the valve seat (101), the second sealing gasket (108) is squeezed to make it fit tightly against the neck of the housing (102).

9. The air supply device for a micro-positive pressure common busbar as described in claim 8, characterized in that, The upper edge of the second sealing gasket (108) is chamfered.

10. The air supply device for a micro-positive pressure common busbar as described in claim 1, characterized in that, A pressure regulating valve is also installed in the pipeline between the second one-way valve and the common tank body.

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