Multi-cavity dry reed and misoperation-proof oil flow speed relay

Abstract

The application provides a multi-cavity dry reed and an anti-malfunction oil flow speed relay. The dry reed comprises a glass tube assembly, multiple pairs of on-off assemblies, a magnetic transmission assembly and a protection part. The glass tube assembly comprises multiple glass tubes, each of which has a sealed cavity. The cavities are independent of each other and arranged side by side. The multiple cavities correspond to the multiple pairs of on-off assemblies one by one. The magnetic transmission assembly is connected with each glass tube and arranged at intervals with the on-off assemblies. The magnetic transmission assembly has magnetism only when an external magnetic field is applied. When the magnetic transmission assembly has magnetism, each on-off assembly is affected by the magnetism of the magnetic transmission assembly and acts. The protection part is formed by pouring insulating material and wraps the glass tube assembly and the parts of the on-off assemblies where carbon adsorption is prone to occur. The end of the on-off assembly penetrates through the protection part to be connected with an external circuit. The application can ensure that each on-off assembly acts at the same time, thereby simultaneously sending multiple groups of signals, effectively preventing the relay from malfunctioning and avoiding the formation of carbon small bridges.

Description

[0001] This application is a divisional application of a multi-cavity reed switch and an anti-maloperation oil flow speed relay (application number: 2022104795835, application date: May 5, 2022). Technical Field

[0002] This invention relates to a multi-cavity reed switch and an oil flow speed control relay to prevent accidental operation. Background Technology

[0003] Transformers are typically equipped with oil flow speed-activated relays to monitor for internal faults. These relays are equipped with reed switches; when a fault occurs inside the transformer, the reed switches either turn on or off, promptly sending a corresponding signal.

[0004] In existing oil flow speed relays, there is usually only one reed switch. However, in actual use, the reed switch may send incorrect signals due to contamination or other reasons, causing the oil flow speed relay to malfunction and leading to more serious consequences.

[0005] On the other hand, existing reed switches place the reed inside a glass tube, with the end of the reed extending out of the tube opening to serve as a conductive lead connecting to an external circuit. High temperature is used to shrink the opening of the glass tube to seal it. While the conductive lead itself has an insulating layer, this layer melts at the tube opening due to the high temperature, resulting in an exposed section of the lead. In existing technology, heat-shrink tubing is used to insulate this exposed section. However, due to the unique shape of the glass tube's shrink-sealed opening and manufacturing limitations, the heat-shrink tubing cannot completely seal the exposed section, leaving a small exposed area. Since oil flow speed-operated relays are immersed in transformer oil during use, this exposed area continuously absorbs carbon particles from the transformer oil, eventually forming carbon bridges. Figure 1 As shown, this will result in insufficient creepage distance of the reed switch, and may even cause carbon bridge breakdown, affecting the normal use of the reed switch and posing a considerable safety hazard to the transformer. Summary of the Invention

[0006] This invention proposes a multi-cavity reed switch and an anti-maloperation oil flow speed relay, which can ensure that all on / off components operate simultaneously, thereby issuing multiple sets of signals at the same time, effectively preventing relay maloperation, and also avoiding the formation of carbon bridges.

[0007] This invention is achieved through the following technical solution: A multi-chamber reed switch includes a glass tube assembly, multiple pairs of on / off components, a magnetic transmission component, and a protective part. The glass tube assembly includes multiple glass tubes, each with a sealed chamber. The chambers are independent of each other and arranged side by side. Each chamber corresponds to one pair of on / off components. The magnetic transmission component is connected to each glass tube and is spaced apart from the on / off components. The magnetic transmission component only becomes magnetic when an external magnetic field is applied. When the magnetic transmission component is magnetic, each on / off component is affected by the magnetism of the magnetic transmission component and actuates. The magnetic transmission component includes multiple magnetic repeater blocks. A magnetic repeater block is embedded in each glass tube between two adjacent chambers. The protective part is formed by casting insulating material and wraps around the parts of the glass tube assembly and the on / off components that are prone to carbon adsorption. The ends of the on / off components protrude through the protective part to connect to an external circuit.

[0008] Furthermore, the glass tube includes a tube wall forming the sealed chamber, two adjacent glass tubes have a common tube wall, the magnetic relay block is embedded in the common tube wall, and the two ends of the magnetic relay block do not protrude from the common tube wall.

[0009] Furthermore, each of the magnetic repeater blocks is integrally formed with each glass tube.

[0010] Furthermore, the magnetic relay block is in the shape of a cuboid or a sphere.

[0011] Furthermore, the magnetic repeater block is made of soft magnetic material.

[0012] Furthermore, the switching assembly includes a fixed rod and a reed switch, both of which are conductive. Both the fixed rod and the reed switch are disposed within the cavity and extend out of the cavity and the protective part at their ends. Both the fixed rod and the reed switch have exposed sections at their extension points from the cavity. These exposed sections are the parts where carbon adsorption is likely to occur. The reed switch becomes magnetic under the action of a magnetic field, deflects towards the fixed rod, and comes into contact with the fixed rod.

[0013] Furthermore, the insulating material includes epoxy resin.

[0014] This invention is also achieved through the following technical solutions: A multi-chamber reed switch includes a glass tube assembly, multiple pairs of on / off components, a magnetic transmission component, and a protective part. The glass tube assembly includes multiple glass tubes, each with a sealed chamber. The chambers are independent of each other and arranged side by side. Each chamber corresponds to one pair of on / off components. The magnetic transmission component is connected to each glass tube and is spaced apart from the on / off components. The magnetic transmission component only becomes magnetic when an external magnetic field is applied. When the magnetic transmission component is magnetic, each on / off component is affected by the magnetism of the magnetic transmission component and actuates. The magnetic transmission component includes a rectangular magnetic relay block, which is connected to each glass tube and extends along the arrangement direction of each chamber. The length of the magnetic relay block is not less than the width of the glass tube assembly. The protective part is formed by casting insulating material and covers the parts of the glass tube assembly and the on / off components that are prone to carbon adsorption. The ends of the on / off components protrude through the protective part to connect to an external circuit.

[0015] Furthermore, the switching assembly includes a fixed rod and a reed switch, both of which are conductive. Both the fixed rod and the reed switch are disposed within the cavity and extend beyond the cavity and protective portion at their ends. Both the fixed rod and the reed switch have exposed sections at their protruding points, which are areas prone to carbon adsorption. The reed switch is magnetic under the influence of a magnetic field, deflecting towards and contacting the fixed rod. The glass tube includes a tube wall forming the sealed cavity. A magnetic relay block is disposed on one side of each tube wall, arranged opposite to the reed switch, so that the reed switch can be affected and activated by the magnetic relay block.

[0016] This invention is also achieved through the following technical solutions: An anti-maloperation oil flow speed relay includes a multi-cavity reed switch as described in any of the above descriptions.

[0017] The present invention has the following beneficial effects: This invention features multiple sets of switching components. By simultaneously activating these components, multiple signals are emitted at the same time. The receiving end judges whether the oil flow speed-operated relay has activated based on the received signals. Compared to existing technologies that rely on only one signal for activation, this effectively reduces the probability of false activation of the oil flow speed-operated relay. Since the multiple switching components are located in multiple chambers, and their operation is affected by an external magnetic field, existing technologies typically use a magnet as the external magnetic field source. However, due to the magnetic reluctance of air, the magnet's magnetism weakens with distance. Switches farther from the magnet experience weaker magnetic influence. To ensure simultaneous activation of all switching components, a magnetic transmission component connected to each glass tube is provided. This magnetic transmission component becomes magnetic when an external magnetic field is applied, thus... When the source approaches the multi-cavity reed switch, the magnetic transmission component reduces the magnetic resistance of the air, allowing the switching component furthest from the magnet to still be affected by the magnetism. This ensures that the multi-cavity reed switch of this invention can simultaneously transmit multiple signals. The magnetic transmission component includes multiple magnetic repeater blocks, with magnetic repeater blocks installed in the common wall of adjacent glass tubes to achieve series connection of the magnetic circuits between the glass tubes. As the distance from the external magnetic field source increases, the switching component farther away will have a longer delay before acting, but the delay time is very short, and it can be almost considered that the switching components act simultaneously, which is suitable for corresponding special occasions. The protective part is made of insulating material, which wraps around the glass tube assembly and the parts of the switching components that are prone to carbon adsorption, thus isolating the parts that may produce carbon adsorption. This prevents carbon adsorption from occurring at the parts of the switching components close to the glass tube assembly, thereby avoiding the formation of carbon bridges and ensuring the normal use of the reed switch.

[0018] The magnetic transmission component includes a cuboid magnetic repeater block, which is connected to each glass tube and extends along the direction of each chamber arrangement. The magnetic repeater block is cuboid and its length is not less than the total width of all glass tubes, realizing the parallel connection of the magnetic circuits between each glass tube. That is, when an external magnetic field source approaches the multi-cavity reed switch, due to the effect of the magnetic repeater block, all switching components are simultaneously affected by magnetism and act, thereby ensuring that each switching component acts simultaneously.

[0019] Each magnetic repeater block is integrally formed with each glass tube. The magnetic repeater block is embedded during the casting of the glass tube. The magnetic repeater block and the glass tube are firmly connected. The process is simple and easy to implement. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of a carbon bridge formed in a multi-cavity reed switch in the prior art.

[0022] Figure 2This is a schematic diagram of the structure of a first embodiment of the multi-cavity reed switch of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of a second embodiment of the multi-cavity reed switch of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the multi-cavity reed switch of the present invention.

[0025] Figure 5 This is a bottom view of the structure of the multi-cavity reed switch embodiment three (with the protective part removed).

[0026] Among them, 11, glass tube; 12, chamber; 13, tube wall; 14, common tube wall; 21, fixing rod; 22, reed; 3, magnetic repeater block; 4, protective part; 5, carbon bridge; 6, insulation layer. Detailed Implementation Example

[0027] like Figure 2 As shown, the multi-cavity reed switch includes a glass tube assembly, three on / off assemblies, a magnetic transmission assembly, and a protective part 4. The glass tube assembly includes three glass tubes 11, each with a sealed chamber 12. The three chambers 12 are independent of each other and arranged side by side. Each chamber 12 corresponds one-to-one with each pair of on / off assemblies, that is, each chamber 12 is provided with one on / off assembly. The chamber 12 is formed by a tube wall 13, and adjacent glass tubes 11 share a common tube wall 14. The magnetic transmission assembly includes two magnetic repeater blocks 3, which are embedded in the common tube wall 14. A magnetic repeater block 3 is provided, with both ends of the repeater block 3 not extending beyond the common tube wall 14, allowing the repeater block 3 and the switching components to be arranged at intervals. The repeater block 3 only becomes magnetic when an external magnetic field is applied. When the transformer fails, the external magnetic field source (such as a magnet) approaches the multi-cavity reed switch, and each repeater block 3 is magnetized sequentially according to its distance from the external magnetic field source, thereby achieving series transmission of the magnetic circuit. The switching components corresponding to each repeater block 3 also operate sequentially, but the action delay time is very short, and they can be considered to operate almost simultaneously. The protective part 4 is formed by casting insulating material and wraps around the glass tube assembly, magnetic transmission assembly, and switching components where carbon adsorption is likely to occur. The end of the switching component protrudes from the protective part 4 to connect with the external circuit. The specific structure of the connection between the end of the switching component and the external circuit is prior art.

[0028] Each glass tube 11 is integrally formed, and each magnetic relay block 3 is also integrally formed with each glass tube 11. The magnetic relay block 3 is embedded during the casting of the glass tube 11, so that the magnetic relay block 3 is firmly bonded to the glass tube 11 and the airtightness of the chamber 12 is guaranteed. The sealed chamber 12 is either a vacuum or filled with an inert gas. The specific type of inert gas used is existing technology.

[0029] The switching assembly includes a fixed rod 21 and a reed switch 22, both of which are conductive. Both are located within the chamber 12, and their ends extend from the same end of the glass tube 11. An insulating layer 6 is provided on both the fixed rod 21 and the reed switch 22, but both have exposed sections not covered by the insulating layer 6 at their protrusions from the chamber 12. The reed switch 22 is made of a soft magnetic material and becomes magnetic under an external magnetic field. Once magnetic, its upper end is attracted to the fixed rod 21, causing it to deflect towards and contact the fixed rod 21, thus enabling the switching assembly to conduct. To improve the effectiveness of the magnetic repeater block 3, it is positioned on the upper part of the common tube wall 14, closer to the upper ends of the fixed rod 21 and the reed switch 22, i.e., closer to the actuating end of the reed switch. Figure 1 As shown, carbon adsorption is prone to occur in the exposed sections of the fixing rod 21 and the reed switch 22 extending out of the glass tube 11. Therefore, the protective part 4 covers this position, isolating it from the outside environment and preventing carbon adsorption. When in use, the fixing rod 21 and the reed switch 22 need to be connected to an external circuit via wires; therefore, the ends of the fixing rod 21 and the reed switch 22 need to extend out of the protective part 4.

[0030] The magnetic repeater block 3 can be rectangular, spherical, or other shapes. The material used to make the magnetic repeater block 3 is a soft magnetic material, such as soft iron. Epoxy resin is chosen as the insulating material for the protective part 4.

[0031] The anti-misoperation oil flow speed relay includes a multi-cavity reed switch as described above and magnets arranged at intervals with the multi-cavity reed switch. In existing oil flow speed relays, the reed switch can be replaced with the multi-cavity reed switch as described above.

[0032] The working principle of this invention is as follows: When a fault occurs inside the transformer, the magnet is pushed close to the multi-cavity reed switch by the oil flow. Each magnetic repeater block 3 is magnetized sequentially according to its distance from the magnet, thereby realizing the series transmission of the magnetic circuit of the magnet. The switching components corresponding to each magnetic repeater block 3 also act sequentially, but the action delay time is very short, and it can be considered as acting simultaneously. This method is applicable to situations where three signals need to be sent sequentially to determine whether the signal emitted by the multi-cavity reed switch is reliable, or situations where the three signals are considered to be emitted simultaneously. When three signals are emitted simultaneously, if the signals of two or three switching components are the same, the signal emitted by the multi-cavity reed switch is determined to be reliable; otherwise, the signal emitted by the multi-cavity reed switch is determined to be unreliable.

[0033] The anti-maloperation oil flow rate relay is immersed in transformer oil during use. The ends of the fixing rod 21 and the reed 22 extending from the glass tube 11 are connected to the positive and negative terminals of a DC power supply via wires. The exposed sections of the fixing rod 21 or the reed 22 connected to the negative terminal of the DC power supply will form carbon bridges 55 due to the adsorption of carbon particles. Figure 1 As shown, in this embodiment, the protective part 4 is provided to wrap the part that may adsorb carbon particles, so that it no longer comes into contact with the transformer oil, thereby avoiding the formation of carbon bridges 55. Example

[0034] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the ends of the fixing rod 21 and the reed switch 22 extend from both ends of the glass tube 11. In this case, the magnetic repeater block 3 is located in the middle of the glass tube 11, closer to the end of the reed switch 22.

[0035] The other parts are the same as in Example 1, and will not be described again here. Example

[0036] like Figure 4 and Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that: In this embodiment, the magnetic repeater block 3 is a cuboid. The magnetic repeater block 3 is disposed on one side of each tube wall 13, and is arranged opposite to the reed switch 22 so that the reed switch 22 can be affected and activated by the magnetic repeater block 3. In this embodiment, the fixing rod 21 and the reed switch 22 are arranged vertically, with the magnetic repeater block 3 positioned on the upper side of each tube wall 13, i.e., closer to the fixing rod 21 of the switching component and further away from the reed switch 22. When the magnetic repeater block 3 is magnetic, the reed switch 22 activates relative to the fixing rod 21. The length of the magnetic repeater block 3 is not less than the width of the glass tube assembly, i.e., not less than the total width of the three glass tubes 11. In this embodiment, the glass tubes 11 can be attached to the magnetic repeater block 3 by adhesive bonding.

[0037] The other parts are the same as in the embodiment, and will not be described again here.

[0038] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A multi-cavity reed switch, characterized in that: The system comprises a glass tube assembly, multiple pairs of switching components, a magnetic transmission assembly, and a protective section. The glass tube assembly includes multiple glass tubes, each with a sealed chamber. These chambers are independent and arranged side-by-side, each corresponding to one pair of switching components. The chambers are either vacuum-filled or filled with inert gas. The magnetic transmission components are connected to each glass tube and spaced apart from the switching components. The magnetic transmission components only become magnetic when an external magnetic field is applied. When a magnetic transmission component is magnetic, the switching components are activated by its magnetism. The magnetic transmission assembly includes multiple magnetic relay blocks, with one relay block embedded in each glass tube between adjacent chambers. The protective section is formed by casting insulating material and covers areas of the glass tube assembly and switching components prone to carbon adsorption. The ends of the switching components protrude from the protective section to connect to an external circuit. Each magnetic relay block is integrally formed with each glass tube, embedded during glass tube casting to ensure a strong bond. The magnetic relay blocks are made of soft magnetic material. The insulating material includes epoxy resin.

2. The multi-cavity reed switch according to claim 1, characterized in that: The glass tube includes a tube wall forming the sealed chamber, two adjacent glass tubes have a common tube wall, the magnetic repeater block is embedded in the common tube wall, and the two ends of the magnetic repeater block do not protrude from the common tube wall.

3. A multi-cavity reed switch according to claim 1 or 2, characterized in that: The magnetic relay block is in the shape of a cuboid or a sphere.

4. A multi-cavity reed switch according to claim 1 or 2, characterized in that: The switching assembly includes a fixed rod and a reed switch. Both the fixed rod and the reed switch are conductive. Both the fixed rod and the reed switch are disposed in the cavity and their ends extend out of the cavity and the protective part. Both the fixed rod and the reed switch have exposed sections at the points where they extend out of the cavity. These exposed sections are the parts where carbon adsorption is likely to occur. The reed switch becomes magnetic under the action of a magnetic field, deflects towards the fixed rod, and comes into contact with the fixed rod.

5. A multi-cavity reed switch, characterized in that: The system comprises a glass tube assembly, multiple pairs of switching components, a magnetic transmission assembly, and a protective section. The glass tube assembly includes multiple glass tubes, each with a sealed chamber. These chambers are independent and arranged side-by-side, each corresponding to one pair of switching components. The chambers are either vacuum-filled or filled with inert gas. The magnetic transmission components are connected to each glass tube and spaced apart from the switching components. The magnetic transmission components only become magnetic when an external magnetic field is applied. When the magnetic transmission components are magnetic, the switching components are affected and activated. Each magnetic transmission component includes a rectangular magnetic relay block, which is connected to each glass tube and extends along the direction of the chamber arrangement. The length of the magnetic relay block is not less than the width of the glass tube assembly. The glass tubes are adhered to the magnetic relay block using an adhesive method. The protective section is formed by casting insulating material and encapsulates the glass tube assembly and switching components in areas prone to carbon adsorption. The ends of the switching components protrude from the protective section to connect to an external circuit. The magnetic relay block is made of a soft magnetic material, and the insulating material for the protective section is epoxy resin.

6. A multi-cavity reed switch according to claim 5, characterized in that: The switching assembly includes a fixed rod and a reed switch, both of which are conductive. Both the fixed rod and the reed switch are disposed within the cavity, with their ends extending out of the cavity and the protective portion. Both the fixed rod and the reed switch have exposed sections at their protruding points, which are areas prone to carbon adsorption. The reed switch is magnetic under the influence of a magnetic field, deflecting towards and contacting the fixed rod. The glass tube includes tube walls forming the sealed cavity. Magnetic relay blocks are disposed on one side of each tube wall, arranged opposite to the reed switches, so that the reed switches can be affected and activated by the magnetic relay blocks.

7. A hydraulic flow speed relay for preventing accidental activation, characterized in that: Including the multi-cavity reed switch as described in any one of claims 1-6.

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