An anti-inrush device for a contactor

Abstract

The utility model discloses an anti -electricity device of shaking of contactor, relate to anti -electricity device of shaking technical field, including shell, be located in the upper line route board and lower line route board of shell, be connected through the connecting piece between the upper line route board and lower line route board, the shell includes the upper shell and lower shell of installation together, the inner wall of lower shell is provided with the positioning boss of contact with lower line route board, the bottom in lower shell is connected with fixed plate, the both ends of lower line route board are provided with the positioning slot, and the both ends of the top of fixed plate are connected with the positioning piece. The utility model discloses an anti -electricity device of shaking of contactor has the effect of installing and fixing quickly to lower line route board, speeds up the speed of installation, improves the speed when producing. At the same time, has the effect of lifting lower line route board to certain height, avoids the damage of installing to the capacitor pin, has the effect of improving security.

Description

Technical Field

[0001] This utility model relates to the technical field of anti-voltage fluctuation devices, and more specifically to an anti-voltage fluctuation device for contactors. Background Technology

[0002] In the production process of coal mines and other similar facilities, there are often momentary drops in grid voltage caused by lightning strikes, short circuits, or internal power grid failures. These drops typically last from 10ms to 3 seconds and are known as "voltage dips" or "voltage spikes." Voltage spikes can cause contactors to release automatically, leading to widespread power outages and significant economic losses for coal mining companies.

[0003] To minimize losses and impacts caused by power fluctuations, specialized structures are typically designed to address such situations. For example, Chinese Patent Application No. 2024202498947 discloses a power fluctuation protection circuit for a vacuum contactor. This patent ensures the contactor remains engaged during power fluctuations, reducing their impact on equipment.

[0004] Anti-voltage fluctuation devices typically involve mounting the circuit board inside a housing. The circuit board contains multiple capacitors to supply power during voltage fluctuations, ensuring its normal operation. However, the following issues arise during production:

[0005] 1. Circuit boards are usually installed in the housing using bolts and other structures. When fixing with bolts, the leads of capacitors are easily squeezed or collided, which can easily cause safety accidents. Moreover, since bolts are needed to fix each corner, the installation process is too cumbersome, resulting in low production efficiency.

[0006] 2. The anti-voltage fluctuation device is filled with an electronic potting resin structure to improve the protection of capacitors. When the resin is poured onto the circuit board from above, the air at the bottom of the circuit board cannot be properly expelled when the resin flows downwards, resulting in air bubbles in the narrow gaps, which affects the quality of the encapsulation.

[0007] Therefore, it is necessary to propose an anti-voltage fluctuation device for contactors to solve the above problems. Utility Model Content

[0008] To address the above problems, this utility model provides an anti-slip device for contactors, which has the function of pouring resin from the bottom, improving the quality during encapsulation. At the same time, it facilitates the fixing of the lower circuit board 102, improving the efficiency during assembly.

[0009] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0010] An anti-slip device for a contactor includes a housing, an upper circuit board and a lower circuit board located inside the housing, the upper circuit board and the lower circuit board being connected by a connector. The housing includes an upper shell and a lower shell mounted together. The inner wall of the lower shell is provided with a positioning boss that contacts the lower circuit board. A fixing plate is connected to the bottom of the lower shell. Positioning grooves are formed at both ends of the lower circuit board. Positioning elements are connected to the top ends of the fixing plate. The top of the positioning elements is connected with symmetrically arranged buckles that pass through the positioning grooves to fix the lower circuit board. A feeding pipe is connected to the top of the positioning elements. A feeding groove is formed inside the feeding pipe and the positioning elements. The bottom outlet of the feeding groove extends out of the positioning elements. A sealing layer is cast inside the lower shell.

[0011] The lower casing has four corner fixing parts, and the bottom of the fixing parts has a support platform, the top of the support platform is in contact with the lower circuit board.

[0012] Preferably, in order to enhance the support for the upper circuit board, a support column is connected to the top of the lower circuit board, and the upper circuit board is connected to the top of the support column.

[0013] Preferably, in order to connect to external wiring, one end of the upper circuit board is connected to a terminal block, and the top edge of the lower shell is provided with a groove to accommodate the terminal block.

[0014] Preferably, in order to increase the exhaust speed of gas at the bottom of the lower circuit board, exhaust grooves are provided on both sides of the inner wall of the lower shell.

[0015] Preferably, in order to enhance the control function, the top of the upper circuit board is connected to a display screen and buttons, and the top of the upper shell is provided with slots corresponding to the display screen and buttons.

[0016] Preferably, in order to reduce the weight of the lower shell and production costs, a cavity is provided inside the fixing part.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This device features a positioning boss, latches, and a support platform within the lower housing, enabling rapid installation and securing of the lower circuit board, thus accelerating installation and increasing production speed. Simultaneously, it elevates the lower circuit board to a certain height, preventing damage to capacitor leads during installation and enhancing safety.

[0019] 2. By incorporating a feeding tube between the clips, the electronic potting resin is injected into the lower housing from the bottom. Compared to the traditional top-pouring method, this avoids the problem of air bubbles caused by gas not being able to escape in time, improving the encapsulation effect and stability. Simultaneously, it facilitates real-time observation of the resin pouring process, thus maintaining encapsulation consistency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the lower shell structure of the upper shell in this utility model;

[0021] Figure 2 This is a schematic diagram of the lower shell and upper circuit board structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the lower shell and fixing plate structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the lower circuit board and positioning groove structure in this utility model;

[0024] Figure 5 This is a schematic diagram of the positioning component and the snap-fit ​​structure in this utility model;

[0025] Figure 6 This is a cross-sectional view of the present invention after the electronic potting resin has been poured.

[0026] Figure 7 This is a schematic diagram of the lower shell of this utility model when no electronic potting resin has been poured in.

[0027] Figure 8 This is a schematic diagram of the process of pouring electronic potting resin into the lower shell of this utility model;

[0028] Figure 9 This is a circuit diagram of the upper and lower circuit boards in this utility model.

[0029] Figure label:

[0030] 101. Upper circuit board; 102. Lower circuit board; 103. Connector; 104. Upper shell; 105. Lower shell; 106. Positioning boss; 107. Fixing plate; 108. Positioning groove; 109. Positioning component; 110. Buckle; 111. Feeding pipe; 112. Feed chute; 113. Sealing layer; 114. Fixing part; 115. Support platform; 116. Support column; 117. Terminal block; 118. Groove; 119. Vent chute; 120. Display screen; 121. Button; 122. Cavity. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The conventional components and key load-bearing components in this case are selected in accordance with standards in terms of material selection, heat treatment process and structural dimensions to ensure that they have sufficient strength, stiffness and fatigue resistance under rated load and expected working conditions. These are all conventional design considerations well known to those skilled in the art.

[0033] Circuit boards are typically mounted inside a housing using bolts and other structures. This not only makes the installation process overly cumbersome and inefficient, but also leads to situations where capacitor leads come into contact with the bolts, affecting safety. When resin is poured onto the circuit board from above, its fluidity causes it to flow downwards from all sides, preventing the effective expulsion of gas at the bottom and resulting in air bubbles that affect the encapsulation effect.

[0034] Please see Figure 1-9 An anti-slip device for a contactor includes a housing, an upper circuit board 101 and a lower circuit board 102 located inside the housing. The circuit boards are arranged in segments to reduce the size of the device and facilitate placement with the contactor. The upper circuit board 101 and the lower circuit board 102 are connected by a connector 103, which is a pin-type structure that connects the two circuit boards by plugging and unplugging. The housing includes an upper shell 104 and a lower shell 105 mounted together and detachable. The inner wall of the lower shell 105 is provided with a positioning boss 106 that contacts the lower circuit board 102. (See reference...) Figure 3When the lower circuit board 102 is placed into the lower housing 105, the positioning boss 106 serves to center it and allow resin to flow downwards from the gaps. A fixing plate 107 is connected to the bottom of the lower housing 105. Positioning grooves 108 are provided at both ends of the lower circuit board 102, and the circuits on the lower circuit board 102 are arranged around the positioning grooves 108. Positioning members 109 are connected to the top ends of the fixing plate 107, and symmetrically arranged buckles 110 are connected to the top of the positioning members 109. The buckles 110 pass through the positioning grooves 108 to fix the lower circuit board 102. During installation, the buckles 110 on the positioning members 109 insert into the positioning grooves 108, thus fixing the lower circuit board 102. To avoid using bolts for fixing, the top of the positioning member 109 is connected to a feeding tube 111. The feeding tube 111 and the inside of the positioning member 109 have a feeding groove 112. The bottom outlet of the feeding groove 112 extends out of the positioning member 109. A sealing layer 113 is poured into the lower shell 105. The sealing layer 113 is formed by pouring electronic potting resin and has the function of protecting the lower circuit board 102 and fixing the lower circuit board 102 in the lower shell 105. During the pouring process, the outlet of the electronic potting resin is aligned with the feeding tube 111. The electronic potting resin enters the lower shell 105 through the feeding tube 111 and flows from the bottom to the top. During the flow, the gas is squeezed out, reducing the presence of air bubbles.

[0035] Traditional top-pouring involves resin flowing downwards from the sides. Due to the viscosity of electronic potting resin, internal gases cannot escape effectively. Compared to top-pouring, this method significantly reduces air bubbles and facilitates observation of resin addition; the resin height indicates the amount added. With traditional top-pouring, the resin flows downwards, causing a decrease in height and making it difficult to observe the amount added, leading to errors such as adding too much or too little resin, which affects encapsulation quality.

[0036] It is important to note that during pouring, it is not possible to completely eliminate air bubbles, as tiny gas particles may remain trapped in narrow gaps. Figure 7 This is a schematic diagram showing the state before the electronic potting resin is poured. Figure 8 This is a schematic diagram after the electronic potting resin has been poured. Figure 6 This is a cross-sectional view after the electronic potting resin has been poured.

[0037] The lower shell 105 has four corner fixing parts 114, and the bottom of the fixing part 114 is provided with a support platform 115, which supports the lower circuit board 102 and allows the resin to flow in the space at the bottom. The top of the support platform 115 is in contact with the lower circuit board 102.

[0038] refer to Figure 4In order to enhance the support for the upper circuit board 101, the top of the lower circuit board 102 is connected to a support column 116. The support column 116 is a hexagonal nylon column, which is an existing structure and is commonly used for fixing circuit boards. It will not be described in detail here. The upper circuit board 101 is connected to the top of the support column 116. The upper circuit board 101 is installed on the support column 116 by screws, etc., which facilitates disassembly and inspection.

[0039] refer to Figure 2 In order to connect to external circuits, the upper circuit board 101 has a terminal block 117 connected to one end. The terminal block 117 is used to connect to signal cables. The top edge of the lower shell 105 has a groove 118 for accommodating the terminal block 117, and the terminal block 117 extends out of the lower shell 105.

[0040] refer to Figure 7 In order to improve the gas discharge speed at the bottom of the lower circuit board 102, exhaust grooves 119 are provided on both sides of the inner wall of the lower shell 105. When the resin flows at the bottom, the air discharge efficiency from the side gap is too slow. The exhaust grooves 119 can speed up the gas discharge.

[0041] refer to Figure 1 and Figure 2 To enhance control, a display screen 120 and a button 121 are connected to the top of the upper circuit board 101. The display screen 120 displays the current status, and the button 121 is used for control. The top of the upper shell 104 has corresponding slots for the display screen 120 and the button 121. (See reference...) Figure 9 , Figure 9 A structure for the internal circuitry of the upper circuit board 101 and the lower circuit board 102 is provided, which has the function of resisting power fluctuations.

[0042] refer to Figure 8 In order to reduce the weight and production cost of the lower shell 105, a cavity 122 is provided in the fixing part 114, which has the effect of reducing weight and production cost.

[0043] In this embodiment, the support column 116 is installed on the lower circuit board 102, and the lower circuit board 102 is placed inside the lower shell 105. The buckle 110 passes through the positioning groove 108 on the lower circuit board 102 to fix the lower circuit board 102. At the same time, the support platform 115 on the inner wall of the lower shell 105 supports the edge of the lower circuit board 102. When pouring resin, the resin outlet is connected to the feeding pipe 111. At this time, the resin will enter the lower shell 105 through the feeding pipe 111 and gradually rise until the lower circuit board 102 is submerged. At this time, the encapsulation is completed. The upper circuit board 101 is installed on the lower circuit board 102 through the connector 103 and fixed with screws. The terminal 117 is always connected to the upper circuit board 101. The terminal 117 is passed through the groove 118. Finally, the upper shell 104 is installed on the lower shell 105 with screws.

[0044] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An anti-voltage fluctuation device for a contactor, characterized in that: The system includes an outer casing, an upper circuit board (101) and a lower circuit board (102) located inside the outer casing. The upper circuit board (101) and the lower circuit board (102) are connected by a connector (103). The outer casing includes an upper shell (104) and a lower shell (105) installed together. The inner wall of the lower shell (105) is provided with a positioning boss (106) that contacts the lower circuit board (102). A fixing plate (107) is connected to the bottom inside the lower shell (105). Positioning grooves (108) are opened at both ends of the lower circuit board (102). Positioning components (109) are connected to the top two ends of the plate (107). The top of the positioning component (109) is connected to symmetrically arranged buckles (110). The buckles (110) pass through the positioning groove (108) to fix the lower circuit board (102). The top of the positioning component (109) is connected to a feeding tube (111). The feeding tube (111) and the positioning component (109) are provided with a feeding groove (112). The bottom outlet of the feeding groove (112) extends out of the positioning component (109). A sealing layer (113) is poured into the lower shell (105). The lower shell (105) has four corners with fixing parts (114), and the bottom of the fixing parts (114) is provided with a support platform (115). The top of the support platform (115) is in contact with the lower circuit board (102).

2. The anti-voltage fluctuation device for a contactor according to claim 1, characterized in that: The top of the lower circuit board (102) is connected to a support column (116), and the upper circuit board (101) is connected to the top of the support column (116).

3. The anti-voltage fluctuation device for a contactor according to claim 2, characterized in that: One end of the upper circuit board (101) is connected to a terminal block (117), and the top edge of the lower shell (105) is provided with a groove (118) to accommodate the terminal block (117).

4. The anti-voltage fluctuation device for a contactor according to claim 3, characterized in that: The lower shell (105) has exhaust grooves (119) on both sides of its inner wall.

5. The anti-voltage fluctuation device for a contactor according to claim 4, characterized in that: The top of the upper circuit board (101) is connected to a display screen (120) and a button (121), and the top of the upper shell (104) has openings corresponding to the display screen (120) and the button (121).

6. The anti-voltage fluctuation device for a contactor according to claim 1, characterized in that: A cavity (122) is provided inside the fixing part (114).

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