A gas relay that is easy to maintain

Abstract

The present invention provides a gas relay that is easy to maintain, including an oil passage chamber, an electrical chamber, an air storage chamber, a baffle, a plate magnet, a first transition magnet, a plurality of first reed switches, a magnetic transmission block and a first induction mechanism, wherein the air storage chamber is arranged at the upper end of the oil passage chamber and is connected to the oil passage chamber, the electrical chamber is independently arranged with the oil passage chamber and the air storage chamber, the oil passage chamber has an oil inlet and an oil outlet, the baffle is rotatably arranged in the oil passage chamber, the plate magnet is arranged on the baffle, a plurality of first reed switches are horizontally arranged in the electrical chamber, the magnetic transmission block is arranged on the plurality of first reed switches in parallel with the arrangement direction of the plurality of first reed switches, the first transition magnet is arranged between the oil passage chamber and the electrical chamber and close to the fault position, and the first transition magnet includes a horizontal portion arranged in parallel with the magnetic transmission block and a vertical portion arranged at the upper end of the horizontal portion. The present invention can avoid the situation where insulation drops and carbon bridges are formed, and when the reed switches are maintained, there is no need to cut off the oil circuit of the transformer, and the maintenance is convenient.

Description

Technical Field

[0001] The invention relates to a gas relay which is convenient for maintenance. Background Art

[0002] The gas relay is an important safety protection device on the oil-immersed transformer. It is installed on the connecting pipe between the transformer cover and the oil storage cabinet. Under the action of the gas or oil flow generated by the internal fault of the transformer, the signal or trip circuit is connected, so that the relevant device sends out an alarm signal or cuts off the transformer from the power grid, thereby protecting the transformer.

[0003] The gas relay sends out a fault signal by checking whether the reed switch is connected or not. In the existing gas relay, the reed switch and the baffle are located in the same space. Therefore, when the relay is in use, the reed switch is immersed in the transformer oil. Such an arrangement has the following defects: first, the reed switch pins are exposed to the oil, which is prone to malfunction due to insulation degradation, and it is easy for a small carbon bridge to form at the exposed part of the reed switch pins. The formation of the small carbon bridge will lead to insufficient creepage distance of the reed switch, and even the breakdown of the small carbon bridge, which will affect the normal use of the reed switch and bring considerable safety hazards to the transformer. In particular, when the gas relay is used for switching the oil chamber of the on-load switch, no matter the arc is extinguished in the oil or the vacuum is Carbon will be generated after arc extinction and switching. Light carbon enters the gas relay, and the electrical circuits such as the glass hot-melt pins of the reed switch are more susceptible to contamination, resulting in malfunction of the gas relay. The reed switch immersed in oil has to withstand a pressure of ±0.1Mpa and is easily broken. Secondly, when inspecting and maintaining the reed switch, the transformer oil circuit must be cut off before the gas relay can be removed, which destroys the overall sealing of the transformer. All the transformer oil must be reprocessed, which is very inconvenient. Finally, in existing gas relays, usually only one reed switch is set, but in actual use, the reed switch may send out a wrong signal, resulting in malfunction of the gas relay, which leads to more serious consequences. Summary of the invention

[0004] The present invention provides a gas relay which is easy to maintain. During use, the first reed switch and the first induction mechanism are isolated from oil, which can avoid insulation degradation and formation of carbon bridges. When maintaining the reed switch, there is no need to cut off the transformer oil circuit, so maintenance is convenient.

[0005] The present invention is achieved through the following technical solutions:

[0006] A gas relay that is easy to maintain, comprising an oil passage chamber, an electrical chamber, an air storage chamber, a baffle, a plate magnet, a first transition magnet, a plurality of first reed switches, a magnetic transmission block and a first induction mechanism, wherein the air storage chamber is arranged at the upper end of the oil passage chamber and is connected to the oil passage chamber, the electrical chamber is independently arranged with the oil passage chamber and the air storage chamber, the oil passage chamber has an oil inlet and an oil outlet, the baffle is rotatably arranged in the oil passage chamber, the plate magnet is arranged on the baffle, a plurality of first reed switches are horizontally arranged in the electrical chamber, the magnetic transmission block is arranged on the plurality of first reed switches parallel to the arrangement direction of the plurality of first reed switches, and the first transition magnet is arranged between the oil passage chamber and the electrical chamber And close to the fault position, the first transition magnet includes a horizontal part arranged in parallel with the magnetic transmission block and a vertical part arranged at the upper end of the horizontal part. The baffle rotates under the action of oil flow, so that the plate magnet moves from the normal position to the fault position. When the plate magnet is in the fault position, it corresponds to the vertical part to magnetize the first transition magnet, and the magnetic transmission block is magnetized by the first transition magnet. The first reed switches act simultaneously under the action of the magnetic transmission block. When the plate magnet is in the normal position, the magnetism of the first transition magnet and the magnetic transmission block disappears. The first sensing mechanism is arranged on the outside of the air storage cavity to detect the oil level in the air storage cavity and send a signal at the corresponding level.

[0007] Furthermore, a plurality of liquid level marking points are vertically spaced apart on the outside of the air storage cavity, and the first sensing mechanism includes a plurality of Hall liquid level sensors which are arranged on the outside of the air storage cavity and are respectively located on each liquid level marking point.

[0008] Furthermore, a plurality of liquid level marking points are vertically spaced apart on the outside of the air storage chamber, and the first sensing mechanism includes a plurality of second reed switches arranged on the outside of the air storage chamber and respectively located at each liquid level marking point, a guide mechanism vertically arranged on the inside of the air storage chamber, a floating block arranged in the air storage chamber, and a liquid level magnet arranged in the floating block, the guide mechanism has a vertical track, and the floating block moves up and down in the track as the liquid level in the air storage chamber changes.

[0009] Furthermore, a position buffer pad is provided at the top of the air storage chamber, and the buffer pad is located above the vertical track.

[0010] Furthermore, the first reed switch includes a glass tube with a sealed cavity, and a fixed rod and a reed sheet respectively arranged in the glass tube, one end of the fixed rod and the reed sheet both extend out of the sealed cavity, the fixed rod and the reed sheet are arranged up and down, and the magnetic transmission block is arranged at the upper end of each glass tube.

[0011] Furthermore, the air storage chamber is arranged on the top plate of the oil passage chamber, and a first through hole connecting the air storage chamber and the oil passage chamber is opened on the top plate of the oil passage chamber. The electrical chamber is arranged on the bottom plate of the oil passage chamber, and the first transition magnet is arranged in the bottom plate.

[0012] Furthermore, an arc track protruding toward the electrical cavity is provided at the upper end of the bottom plate, and the fault position is the most protruding part of the arc track.

[0013] Furthermore, the bottom plate is made of aluminum alloy or stainless steel.

[0014] Furthermore, a second sensing mechanism is provided on the outside of the oil passage chamber to detect the liquid level of the oil in the oil passage chamber.

[0015] Furthermore, the first transition magnet and the magnetic transmission block are made of soft iron.

[0016] The present invention has the following beneficial effects:

[0017] 1. When the transformer fails, gas is generated. When the amount of gas is small, it rises from the oil chamber to the gas storage chamber, thereby reducing the oil level in the gas storage chamber. The first sensing mechanism can detect the oil level in the gas storage chamber and send a signal at the corresponding level. When the fault is serious and the amount of gas is large, the gas will no longer rise to the gas storage chamber, but will be entrained with oil to form an oil flow and rush out of the oil chamber quickly, which will push the baffle to rotate, so that the plate magnet moves from the normal position to the fault position. The plate magnet is located in the fault position, which makes the first transition magnet magnetic, and the first reed switch is affected by the magnetism and moves. Because the electrical chamber is independent of the flow chamber and the gas storage chamber, it is set The first reed switch in the electrical cavity will never come into contact with oil at any time, thereby avoiding the situation in the prior art where the insulation of the first reed switch pin is reduced, a carbon bridge is formed, and the first reed switch is broken due to being immersed in oil, thereby ensuring the sensitivity and service life of the first reed switch; on the other hand, when the reed switch needs to be inspected and maintained, since the oil flow does not flow through the electrical cavity, there is no need to cut off the transformer oil circuit, and only the electrical cavity needs to be opened, which is convenient for maintenance and avoids damaging the overall sealing of the transformer; furthermore, in order to ensure the independence of the oil cavity and the electrical cavity, the distance between the first reed switch and the plate magnet becomes larger, which may cause the magnetic properties of the plate magnet to deteriorate. When it reaches the first reed switch, it has become weak, which causes the first reed switch to be unable to operate normally. Therefore, a first transition magnet is set between the oil passage chamber and the electrical chamber. After the plate magnet is located at the fault position, the first transition magnet is magnetized by the plate magnet and has magnetism. This magnetism ensures that the first reed switch can operate in time, thereby ensuring the normal use of the gas relay. In order to avoid misoperation, multiple first reed switches are arranged at intervals in the electrical chamber horizontally. By making multiple first reed switches operate at the same time, multiple signals are sent out at the same time. The receiving end makes a judgment based on the received multiple signals to determine whether the gas relay is operated. Compared with the prior art, which only judges based on A signal is used to determine whether to operate, which can effectively reduce the probability of false operation of the gas relay. Since the first reed switches are arranged horizontally at intervals and due to the influence of the magnetic resistance of the air, the magnetism will decay with the increase of the distance. The farther the first reed switch is from the first transition magnet, the weaker the magnetic influence it is subjected to. Therefore, the present invention provides a magnetic transmission block. When the plate magnet is located at the fault position, the first transition magnet is magnetized, and then the magnetic transmission block is magnetized. In this way, the first reed switches can be operated simultaneously. The vertical and horizontal parts of the first transition magnet are arranged so that the first transition magnet and the magnetic transmission block can be magnetized more easily.

[0018] 2. The first sensing mechanism can be a plurality of Hall liquid level sensors vertically spaced apart on the outside of the air storage chamber, or a plurality of second reed switches vertically spaced apart on the outside of the air storage chamber and a liquid level magnet arranged in the air storage chamber, that is, all electrical components are arranged on the outside of the air storage chamber, so that the electrical components will not come into contact with the oil during operation.

[0019] 3. An arc track protruding toward the electrical cavity is provided at the lower end of the top plate. The fault position is the most protruding part of the arc track, that is, the thinnest part of the top plate. This can not only limit the movement trajectory of the plate magnet, but also further ensure that the reed switch can operate normally and in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below with reference to the accompanying drawings.

[0021] Figure 1-1 It is a schematic cross-sectional structure diagram of a plate magnet in a normal position according to an embodiment of the present invention.

[0022] Figure 1-2 It is a schematic cross-sectional structure diagram of a plate magnet located at a fault position according to an embodiment of the present invention.

[0023] Figure 1-3 This is a schematic diagram of the bottom-up structure of the first reed switch and the magnetic transmission block according to the first embodiment of the present invention.

[0024] Figure 1-4 This is a schematic diagram of a first reed switch, a magnetic transmission block, a first transition magnet and a plate magnet in a fault position according to a first embodiment of the present invention.

[0025] Figure 2 It is a schematic cross-sectional structure diagram of the planar magnet in the normal position according to the second embodiment of the present invention.

[0026] Figure 2-1 It is a schematic diagram of the structure of the guide plate in the second embodiment of the present invention.

[0027] Figure 2-2 for Figure 2-1 Schematic diagram of the top view structure.

[0028] Figure 3 It is a schematic cross-sectional structure diagram of the plate magnet in the normal position according to the third embodiment of the present invention.

[0029] The arrows in the figure show the direction of oil flow.

[0030] Among them, 1. oil chamber; 11. oil inlet; 12. oil outlet; 13. side plate; 131. second through hole; 14. top plate; 141. first through hole; 15. bottom plate; 16. arc track; 17. bracket; 18. rotating shaft; 19. second inclined plate; 2. electrical chamber; 3. air storage chamber; 31. air injection port; 41. oil flow plate; 42. first inclined plate; 5. plate magnet; 6. first transition magnet; 61. horizontal part; 62. vertical part; 7. first reed switch; 71. glass tube; 72. fixing rod; 73. reed sheet; 81. Hall liquid level sensor; 82. second reed switch; 83. floating block; 84. liquid level magnet; 85. guide plate; 86. L-shaped plate; 87. buffer pad; 9. magnetic transmission block. DETAILED DESCRIPTION

[0031] Embodiment 1:

[0032] like Figure 1-1 to Figure 1-4As shown, the gas relay which is easy to maintain includes an oil passage chamber 1, an electrical chamber 2, an air storage chamber 3, a baffle, a plate magnet 5, a first transition magnet 6, three first reed switches 7, a magnetic transmission block and a first induction mechanism. The oil passage chamber 1 is formed by a side plate 13 which surrounds the chamber 1 and a top plate 14 and a bottom plate 15 which are respectively arranged at the upper and lower ends of the side plate 13. The bottom plate 14 is made of a plate material which can be penetrated by magnetic signals, such as a stainless steel material. The oil passage chamber 1 has an oil inlet 11 and an oil outlet 12. The side plate 13 is provided with a second through hole 131 which is respectively connected with the oil inlet 11 and the oil outlet 12. The air storage chamber 3 is arranged on the top plate 14 of the oil passage chamber 1. The air storage chamber 3 is connected with the oil passage chamber 1. The top plate 14 is provided with a first through hole 141 which connects the oil passage chamber 1 and the air storage chamber 3. The electrical chamber 2 is arranged independently of the oil passage chamber 1 and the air storage chamber 3, and the electrical chamber 2 is arranged on the bottom plate 15 of the oil passage chamber 1. The upper end of the baffle is rotatably arranged in the oil passage chamber 1, and the plate magnet 5 is arranged at the lower end of the baffle. Three first reed switches 7 are arranged horizontally in the electrical chamber 2. More specifically, a single first reed switch 7 is arranged horizontally in the electrical chamber 2, and the three first reed switches 7 are arranged horizontally in the longitudinal direction. The magnetic transmission block 9 is a rectangular parallelepiped, which is also arranged horizontally in the longitudinal direction on the three first reed switches 7. In this embodiment, the first reed switch 7 includes a glass tube 71 with a sealed cavity, and a fixed rod 72 and a reed sheet 73 respectively arranged in the glass tube 71. One end of the fixed rod 72 and the reed sheet 73 both extend out of the sealed cavity to form a pin. The fixed rod 72 and the reed sheet 73 are arranged up and down. The magnetic transmission block 9 is arranged at the upper end of each glass tube 71. When the magnetic transmission block 9 is magnetic, the reed sheet 73 is affected by the magnetism and moves upward, thereby contacting the fixed rod 72. The first transition magnet 6 is arranged in the bottom plate 15 of the oil passage chamber 1 and is close to the fault position. The first transition magnet 6 includes a horizontal portion 61 arranged in parallel with the magnetic transmission block and a vertical portion 62 arranged at the upper end of the horizontal portion 61. The horizontal portion 61 and the vertical portion 62 are both rectangular parallelepipeds. When the baffle is in the fault position, it corresponds to the vertical portion 62 and is located above the vertical portion 62. A closable gas injection port 31 is provided on the top of the gas storage chamber 3. When in normal use, the gas injection port 31 is in a closed state. The specific closing structure is the prior art. A plurality of liquid level marking points are arranged vertically at intervals on the outer wall of the gas storage chamber 3. The first sensing mechanism includes a plurality of Hall level sensors 81 arranged on the outside of the gas storage chamber 3 and respectively located on each liquid level marking point. The Hall level sensor 81 is used to detect the liquid level of the oil in the gas storage chamber 3. When the liquid level changes to a certain liquid level marking point, the corresponding Hall level sensor 81 will send a signal. The Hall level sensor can be arranged on the outside of the gas storage chamber 3 by pasting or the like. The baffle rotates under the action of oil flow, causing the plate magnet 5 to move from the normal position to the fault position. When the plate magnet 5 is in the fault position, it corresponds to the vertical portion 62 to magnetize the first transition magnet, and the magnetic transmission block is magnetized by the first transition magnet. The first reed switches 7 operate simultaneously under the action of the magnetic transmission block. When the plate magnet 5 is in the normal position, the magnetism of the first transition magnet 6 and the magnetic transmission block disappears.

[0033] A bracket 17 is arranged in the oil chamber 1. The bracket 17 is two support plates arranged at intervals. The upper ends of the support plates are arranged on the top plate 14. The baffle includes an oil flow plate 41 that withstands the impact of the oil flow and a first inclined plate 42 arranged at the lower end of the oil flow plate 41. The plate magnet 5 is arranged at the rear end of the first inclined plate 42. The rotating mechanism includes a rotating shaft 18 arranged on the two support plates, and two second inclined plates 19 arranged at the upper ends of both sides of the oil flow plate 41 and extending backward. The two second inclined plates 19 are rotatably arranged on the rotating shaft 18. The lower end of the baffle is inclined toward the oil inlet 11. The normal position is close to the oil inlet 11, and the fault position is far away from the oil inlet 11. The specific installation structure of the rotating shaft 18 is the existing technology.

[0034] A second sensing mechanism is arranged outside the oil passage chamber 1 to detect the oil level in the oil passage chamber 1. The second sensing mechanism is also a Hall level sensor, and its arrangement is the same as that of the first sensing mechanism.

[0035] In this embodiment, the first transition magnet 6 and the magnetic transmission block 9 are both made of soft iron.

[0036] Embodiment 2:

[0037] like Figure 2 , Figure 2-1 and Figure 2-2 As shown, the difference between this embodiment and the first embodiment is that:

[0038] A plurality of liquid level marking points are arranged at vertical intervals on the outside of the air storage chamber 3. The first sensing mechanism includes a plurality of second reed switches 82 arranged on the outside of the air storage chamber 3 and respectively located at each liquid level marking point, a guide mechanism arranged vertically in the air storage chamber 3 near the second reed switches 82, a floating block 83 arranged in the air storage chamber 3, and a liquid level magnet 84 arranged in the floating block 83. The guiding mechanism includes a guide plate 85 arranged vertically on the inside of the air storage chamber 3 and two L-shaped plates 86 arranged on both sides of the two guide plates 85, respectively, with a gap between the two L-shaped plates 86, and the guide plate 85 and the two L-shaped plates 86 form a vertical track. The floating block 83 is a hollow capsule made of a material that can float on oil. The liquid level magnet 84 is arranged in the hollow capsule, and the hollow capsule is arranged horizontally between the two L-shaped plates 86, so that the liquid level magnet 84 can move up and down in the vertical track as the liquid level in the air storage chamber 3 changes. More specifically, the hollow capsule floats on the oil surface and follows the oil. The position changes with the change of liquid level. When the liquid level changes to a certain liquid level mark point, the liquid level magnet 84 in the hollow capsule activates the corresponding second reed switch 82, thereby sending a signal. The two ends of the hollow capsule are respectively restricted by two L-shaped plates 96, so that it can only move up and down in the vertical track, thereby avoiding the situation where the liquid level magnet 84 is far away from the second reed switch 82 and cannot work normally. A buffer pad 87 is also provided on the top of the air storage chamber 3. The buffer pad 87 is located above the vertical track to avoid the floating block 93 from colliding with the top of the air storage chamber 3 when the transformer vibrates. Damage. In this embodiment, the hollow capsule is made of oil-resistant foam material. The specific installation structure of the second reed switch 82 is prior art.

[0039] Select a liquid level magnet with appropriate magnetic force so that the liquid level magnet can activate the correct second reed switch without affecting other second reed switches.

[0040] A second sensing mechanism is arranged outside the oil passage chamber 1 to detect the oil level in the oil passage chamber 1 , and the second sensing mechanism is the same as the first sensing mechanism.

[0041] The other contents of this embodiment are the same as those of the first embodiment and will not be described again here.

[0042] like Figure 3 As shown, the difference between this embodiment and the first embodiment is that:

[0043] The upper end of the bottom plate 15 is provided with an arc track 16 protruding toward the electrical chamber 2. The fault position is the most protruding part of the arc track 16. The first transition magnet 6 is also provided at the most protruding part. The first transition magnet 6 can be arranged by pasting or the like. In this embodiment, due to the provision of the arc track 16, the oil flow plate 41 of the baffle is longer so that the plate magnet 5 can move in the arc track 16.

[0044] The other contents of this embodiment are the same as those of the first embodiment and will not be described again here.

[0045] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A gas relay that is easy to maintain, characterized in that: The invention comprises an oil passage chamber, an electrical chamber, an air storage chamber, a baffle, a plate magnet, a first transition magnet, a plurality of first reed switches, a magnetic transmission block and a first induction mechanism, wherein the air storage chamber is arranged at the upper end of the oil passage chamber and is connected with the oil passage chamber, the electrical chamber is independently arranged with the oil passage chamber and the air storage chamber, the oil passage chamber has an oil inlet and an oil outlet, the baffle is rotatably arranged in the oil passage chamber, the plate magnet is arranged on the baffle, the plurality of first reed switches are horizontally arranged in the electrical chamber, the magnetic transmission block is arranged on the plurality of first reed switches in parallel with the arrangement direction of the plurality of first reed switches, the first transition magnet is arranged between the oil passage chamber and the electrical chamber and close to the fault position The first transition magnet includes a horizontal portion arranged in parallel with the magnetic transmission block and a vertical portion arranged at the upper end of the horizontal portion. The baffle rotates under the action of the oil flow, so that the plate magnet moves from the normal position to the fault position. When the plate magnet is in the fault position, it corresponds to the vertical portion to magnetize the first transition magnet, and the magnetic transmission block is magnetized by the first transition magnet. Each first reed switch operates simultaneously under the action of the magnetic transmission block. When the plate magnet is in the normal position, the magnetism of the first transition magnet and the magnetic transmission block disappears. The first sensing mechanism is arranged on the outside of the air storage chamber to detect the oil level in the air storage chamber and send a signal at the corresponding level.

2. A gas relay that is easy to maintain according to claim 1, characterized in that: A plurality of liquid level marking points are vertically spaced apart on the outside of the air storage cavity, and the first sensing mechanism comprises a plurality of Hall liquid level sensors arranged on the outside of the air storage cavity and respectively located on each liquid level marking point.

3. A gas relay easy to maintain according to claim 1, characterized in that: A plurality of liquid level marking points are vertically spaced apart on the outside of the air storage chamber. The first sensing mechanism comprises a plurality of second reed switches arranged on the outside of the air storage chamber and respectively located at each liquid level marking point, a guide mechanism vertically arranged on the inside of the air storage chamber, a floating block arranged in the air storage chamber, and a liquid level magnet arranged in the floating block. The guide mechanism has a vertical track, and the floating block moves up and down in the track as the liquid level in the air storage chamber changes.

4. A gas relay easy to maintain according to claim 3, characterized in that: A position buffer pad is arranged on the top of the air storage cavity, and the buffer pad is located above the vertical track.

5. A gas relay easy to maintain according to claim 1, 2, 3 or 4, characterized in that: The first reed switch includes a glass tube with a sealed cavity, and a fixed rod and a reed sheet respectively arranged in the glass tube, one end of the fixed rod and the reed sheet both extend out of the sealed cavity, the fixed rod and the reed sheet are arranged up and down, and the magnetic transmission block is arranged at the upper end of each glass tube.

6. A gas relay easy to maintain according to claim 1, 2, 3 or 4, characterized in that: The air storage chamber is arranged on the top plate of the oil passage chamber, and a first through hole connecting the air storage chamber and the oil passage chamber is opened on the top plate of the oil passage chamber. The electrical chamber is arranged on the bottom plate of the oil passage chamber, and the first transition magnet is arranged in the bottom plate.

7. A gas relay easy to maintain according to claim 6, characterized in that: The upper end of the bottom plate is provided with an arc track protruding toward the electrical cavity, and the fault position is the most protruding part of the arc track.

8. The gas relay easy to maintain according to claim 6, characterized in that: The bottom plate is made of aluminum alloy or stainless steel.

9. A gas relay easy to maintain according to claim 1, 2, 3 or 4, characterized in that: A second sensing mechanism is arranged outside the oil passage cavity to detect the liquid level of the oil in the oil passage cavity.

10. A gas relay that is easy to maintain according to claim 1, 2, 3 or 4, characterized in that: The first transition magnet and the magnetic transmission block are made of soft iron.

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