Transparent window explosion-proof structure of electric energy metering box

Abstract

The application relates to the technical field of electric energy metering boxes, and discloses an explosion-proof structure of a transparent window of an electric energy metering box, which comprises a box body, a box door is installed on one side of the box body through a hinge shaft, a transparent window is arranged on the box door, a driven frame body is movably connected to the edge of the front face of the box body, the driven frame body has magnetism, a driving frame body is arranged on the rear side of the driven frame body and installed in the box body, the driving frame body has magnetism, the polarity of the side, where the driven frame body and the driving frame body are close to each other, is the same, and when the driving frame body approaches the driven frame body, the driven frame body is moved outward under repulsion. The component for generating pressure on the middle part of the sealing strip is arranged, double sealing can be formed, the sealing effect is improved, meanwhile, through cooperation of a micro motor and pressure detection, the pressure component can increase the pressure on the sealing strip according to the pressure at the sealing position, so that the sealing performance of the sealing strip is maintained.

Description

Technical Field

[0001] This invention relates to the field of electricity metering box technology, specifically to an explosion-proof structure with a transparent window for an electricity metering box. Background Technology

[0002] The electricity metering box is a device used for electricity metering in 3~35kV three-phase power systems. It mainly consists of a combined instrument transformer, a box, and an electricity meter. The transparent window of the electricity metering box is mainly used for remote meter reading and monitoring of operating status. If the metering box is installed in areas with explosion hazards such as petroleum, chemical, and coal mines where there are flammable gases and dust, an explosion-proof metering box must be selected. In this case, the transparent window needs to be part of the explosion-proof enclosure to ensure that an internal explosion will not ignite the external environment.

[0003] However, in actual use, the transparent window will experience optical performance degradation due to environmental pollutants. Acids, salt spray, oil, and dust in the industrial environment adhere to the window surface, forming a scattering layer. Some chemical substances may also return to the material itself, causing permanent turbidity and accelerating aging. At the same time, the sealing strip between the metering box door and the box body loses elasticity with the increase of use, and eventually aging will cause a decrease in sealing performance. It requires manual inspection periodically by visual inspection, which is troublesome and the inspection results are too dependent on human experience, thus having shortcomings. Summary of the Invention

[0004] In view of the shortcomings of existing explosion-proof power metering boxes mentioned in the background art, the present invention provides an explosion-proof structure with a transparent window for power metering boxes, which has the advantages of long service life and good sealing performance, and solves the technical problems mentioned in the background art.

[0005] This invention provides the following technical solution: an explosion-proof structure with a transparent window for an electricity metering box, comprising a box body, a door mounted on one side of the box body via a hinge, a transparent window on the door, a driven frame movably connected to the edge of the front of the box body, the driven frame being magnetic, an active frame mounted inside the box body on the rear side of the driven frame, the active frame being magnetic, the driven frame and the active frame having the same polarity on the side they approach each other, when the active frame approaches the driven frame, the driven frame is repulsed and moves outward, which can further increase the force on the sealing strip and deform the sealing strip, restoring the sealing effect caused by aging, etc., a drive device is provided on the rear side of the active frame, the drive device is a micro slow-speed motor, 37 / 38 series can be used, the output shaft of the drive device is movably connected to the rear side of the active frame via a thread, a sealing strip corresponding to the position of the driven frame is provided on the inner side of the door, and a pressure sensor that can contact the sealing strip is installed on the front side of the box body.

[0006] Furthermore, the front edge of the box has a mounting groove for mounting the driven frame, and the box is made of cast aluminum alloy, which meets the requirements for use of explosion-proof power metering boxes. It is also not magnetically attracted, ensuring the coordinated movement of the driven frame and the active frame. The outer side of the box is connected with a hanging ring.

[0007] Furthermore, the driven frame is connected to the mounting slot by a telescopic spring for resetting the driven frame. At the same time, a guide rod is connected between the driven frame and the mounting slot. In the initial state, the outer side of the driven frame protrudes from the front plane of the housing.

[0008] Furthermore, the active frame has the same shape and structure as the driven frame, and the active and driven frames are positioned coincidentally. The active frame is movably connected to the inside of the housing via a guide rod, which restricts the position of the active frame so that it can only move perpendicular to the front of the housing. The active frame is covered by a protective shell connected to the inside of the housing. The protective shell is made of the same material as the housing and provides isolation for the active frame without affecting its movement. The rear of the active frame is connected to symmetrically arranged internal threaded cylinders. The output shaft of the drive device is connected to these threaded cylinders via a thread, and the drive device is connected to the power supply inside the housing and controlled by the control system. The drive device operates and causes the active frame to move closer to the driven frame.

[0009] Furthermore, pressure sensors are symmetrically installed on the upper and lower sides of the front of the enclosure, and the detection end of the pressure sensor is in contact with the sealing strip. The pressure sensor is connected to the control system and sends corresponding detection data. The position of the drive device corresponds one-to-one with the pressure sensor, and the detection results of the pressure sensor correspond to the drive device respectively. This enables the control system to control the drive device to move and make the active frame move, so as to maintain the pressure of the sealing strip on the connection of the enclosure and ensure the sealing performance of the explosion-proof structure.

[0010] Furthermore, the sealing strip is embedded in the door and is made of rubber. A groove is provided in the middle of the sealing strip, and the position of the groove corresponds to the driven frame. The groove is movably fitted onto the outside of the driven frame. After the door is closed, the driven frame generates pressure on the inside of the groove, which can achieve double sealing, improve the sealing performance of the explosion-proof structure, and thus enhance the explosion-proof isolation effect.

[0011] Furthermore, symmetrical action blocks are connected to the upper and lower ends of the outer side of the door, and the action blocks protrude towards the box body.

[0012] Furthermore, a protective plate is provided on the outside of the enclosure. The protective plate has an arc-shaped structure, and the top and bottom of the protective plate are connected to the top and bottom of the enclosure via a connecting shaft. The connecting shaft is a torsion spring shaft, and a movable plate is connected to one side of the movable end of the connecting shaft. The moving path of the movable plate and the moving block is on the same circle. When the enclosure door is closed, the moving block exerts pressure on the movable plate and causes the protective plate to deflect to the front of the enclosure, which can play a protective role and block the enclosure door from being blown out, thereby improving the explosion-proof performance.

[0013] Furthermore, a retractable shaft is installed on the outside of the protective plate. The retractable shaft is flexible and has a fabric with a width greater than that of the transparent window on the door wound on it. The fabric is made of aramid fiber and has explosion-proof function. The outermost end of the fabric is connected to a hook, which is movably attached to a hanging ring. It can cover the outside of the explosion-proof window to reduce external pollution and other problems. At the same time, it can also reduce the impact of external light refraction through the window on the internal components.

[0014] The present invention has the following beneficial effects: 1. This invention, by setting up a component that generates pressure on the middle of the sealing strip, can form a double seal and improve the sealing effect. At the same time, through the cooperation of a micro motor and pressure detection, the pressure component can be controlled to increase the pressure on the sealing strip according to the pressure at the sealing point, thereby maintaining the sealing performance of the sealing strip.

[0015] 2. This invention features a linked protective plate on the outside of the cabinet door, which moves to the front of the door after it is closed, thus blocking the door from exploding. Simultaneously, an elastically rolled explosion-proof fabric is placed on the outside of the protective plate to protect the explosion-proof transparent window, reducing optical performance degradation and aging, ensuring clear readings, and also blocking the door from exploding, thus improving the safety of the structure. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of the invention; Figure 2 This is a partial cross-sectional structural diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the external structure of the present invention.

[0017] In the diagram: 1. Housing; 101. Hanging ring; 102. Mounting groove; 2. Driven frame; 3. Door; 31. Actuating block; 4. Protective plate; 41. Connecting shaft; 411. Movable plate; 5. Sealing strip; 51. Groove; 6. Rewinding shaft; 61. Hook; 7. Active frame; 71. Drive unit; 8. Pressure sensor; 9. Protective shell. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0019] Please see Figure 1 An explosion-proof structure with a transparent viewing window for an electricity metering box includes a box body 1. A door 3 is installed on one side of the box body 1 via a hinge. An explosion-proof transparent viewing window is provided on the door 3. When the door 3 is closed, the connection between it and the box body 1 can be achieved using conventional explosion-proof methods. An installation groove 102 is provided on the front edge of the box body 1 for installing a driven frame 2. The box body 1 is made of cast aluminum alloy, which meets the usage requirements of an explosion-proof electricity metering box. At the same time, it will not be magnetically attracted, ensuring the cooperative movement of the driven frame 2 and the active frame 7. A hanging ring 101 is connected to the outside of the box body 1.

[0020] Please see Figure 2-3 A driven frame 2 is movably connected to the edge of the front of the housing 1. The driven frame 2 is magnetic. The driven frame 2 is connected to the mounting groove 102 via a telescopic spring for resetting. A guide rod is connected between the driven frame 2 and the mounting groove 102. In the initial state, the outer side of the driven frame 2 protrudes from the front plane of the housing 1, which can exert pressure on the sealing strip 5. An active frame 7 is installed inside the housing 1 on the rear side of the driven frame 2. The active frame 7 is magnetic. The polarity of the active frame 2 and the active frame 7 is the same on the side they are close to. When the active frame 7 moves closer to the passive frame 2, the passive frame 2 is repelled and moves outward, which can further increase the force on the sealing strip 5 and deform the sealing strip 5, thus restoring the sealing effect caused by aging and other reasons. A drive device 71 is provided on the rear side of the active frame 7. The drive device 71 is a miniature slow-speed motor, which can be a 37 / 38 series motor. The output shaft of the drive device 71 is movably connected to the rear side of the active frame 7 through a thread.

[0021] The active frame 7 has the same shape and structure as the driven frame 2. The active frame 7 and the driven frame 2 are in the same position. The active frame 7 is movably connected to the inside of the housing 1 through a guide rod. The guide rod is used to limit the position of the active frame 7, so that the active frame 7 can only move perpendicular to the front side of the housing 1. The active frame 7 is covered by a protective shell 9 connected to the inside of the housing 1. The protective shell 9 is made of the same material as the housing 1 and provides an isolation effect for the active frame 7 without affecting its movement. The rear side of the active frame 7 is connected to an internally threaded cylinder arranged symmetrically. The output shaft of the drive device 71 is connected to the threaded cylinder through a thread. The drive device 71 is connected to the power supply inside the housing 1 and is controlled by the control system. The drive device 71 works and causes the active frame 7 to move closer to the driven frame 2.

[0022] Please see Figure 1 The inner side of the door 3 is provided with a sealing strip 5 corresponding to the position of the driven frame 2. The sealing strip 5 is embedded in the door 3 and is made of rubber. A groove 51 is provided in the middle of the sealing strip 5, and the position of the groove 51 corresponds to the driven frame 2. The groove 51 is movably sleeved on the outside of the driven frame 2. After the door 3 is closed, the driven frame 2 generates pressure on the inside of the groove 51, which can achieve double sealing and improve the sealing performance of the explosion-proof structure, thereby improving the explosion-proof isolation effect. A pressure sensor 8 that can contact the sealing strip 5 is installed on the front side of the box 1. The pressure sensor 8 is symmetrically installed on the upper and lower sides of the front of the box 1, and the detection end of the pressure sensor 8 contacts the sealing strip 5. The pressure sensor 8 is connected to the control system and sends corresponding detection data. The position of the drive device 71 corresponds one-to-one with the pressure sensor 8, and the detection results of the pressure sensor 8 correspond to the drive device 71, so that the control system can control the drive device 71 to move and make the active frame 7 move to maintain the pressure of the sealing strip 5 on the box connection and ensure the sealing performance of the explosion-proof structure.

[0023] Please see Figure 4Actuating blocks 31 are symmetrically connected to the upper and lower ends of the outer side of the door 3. The actuating blocks 31 protrude towards the box body 1. A protective plate 4 is provided on the outer side of the box body 1. The protective plate 4 has an arc-shaped structure, and its top and bottom are connected to the top and bottom of the box body 1 via a connecting shaft 41. The connecting shaft 41 is a torsion spring shaft, and a movable plate 411 is connected to one side of the movable end of the connecting shaft 41. The moving paths of the movable plate 411 and the actuating blocks 31 are on the same circle. When the door 3 is closed, the actuating blocks 31 exert pressure on the movable plate 411 and cause the protective plate 4 to deflect to the front side of the box body 1. It provides a protective effect, blocking the explosion when the door 3 is blown out, thus improving the explosion-proof performance. A winding shaft 6 is installed on the outside of the protective plate 4. The winding shaft 6 is an elastic winding shaft, and a fabric with a width greater than the transparent window on the door 3 is wound on the winding shaft 6. The fabric is made of aramid fiber and has explosion-proof function. The outermost end of the fabric is connected to a hook 61, which is movably hung on the hanging ring 101. It can cover the outside of the explosion-proof window, reduce external pollution and other problems, extend the service life of the explosion-proof window, and also reduce the impact of external light refraction through the window on the internal components.

[0024] In addition, an alarm button is also provided on the inner wall of the housing 1. The button is located on the travel path of the active frame 7. When the active frame 7 travels a certain distance, it means that the sealing strip 5 has been completely aged and affects the sealing effect. At this time, the sealing strip 5 can be replaced, which can replace manual inspection, save manpower, and the detection results are more accurate.

[0025] The method of use (working principle) of this invention is as follows: During use, the driven frame 2 generates pressure inside the groove 51, creating two contact surfaces between the sealing strip 5 and the housing 1, forming a double seal. The pressure sensor 8 monitors the pressure generated by the sealing strip at both positions in real time. When the pressure drops to a specified value, the control system sends a signal to the drive device 71 and controls the drive device 71 to move forward, causing the driven frame 7 to be repelled. This increases the pressure of the driven frame 2 on the sealing strip 5, causing the sealing strip 5 to deform under pressure and restore its sealing effect. When a reading is needed, the hook 61 is removed from the hanging ring 101, allowing the reading to be taken through the explosion-proof window. The hook 61 is then reattached to the hanging ring 101, allowing the door 3 to... The explosion-proof viewing window is covered, and external dust and other contaminants are isolated by the fabric on the take-up shaft 6. When the door 3 is opened, the actuating block 31 first moves away from the movable plate 411. The loss of external pressure on the connecting shaft 41 causes the protective plate 4 to deflect. The protective plate 4 moves away from the door 3 first, and then the door 3 moves to the position before the protective plate 4. If an explosion or other problem occurs inside the box 1, causing the door 3 to blow out, the door 3 is first blocked by the protective plate 4 and the fabric on the take-up shaft 6. When the protective plate 4 and the fabric on the take-up shaft 6 break, the door 3 separates from the box 1. When the active frame 7 moves to a certain position and triggers the alarm button, the sealing strip 5 needs to be replaced. At the same time, the system control drive device 71 makes the active frame 7 return to its original position, and the driven frame 2 also returns to its original position under the action of the spring.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof structure with a transparent window for an electricity metering box, comprising a box body (1), a door (3) mounted on one side of the box body (1) via a hinge, and a transparent window provided on the door (3), characterized in that: A driven frame (2) is movably connected to the edge of the front of the box (1), and the driven frame (2) is magnetic. An active frame (7) is installed inside the box (1) on the rear side of the driven frame (2), and the active frame (7) is magnetic. The polarities of the driven frame (2) and the active frame (7) are the same on the side closest to each other. A driving device (71) is provided on the rear side of the active frame (7). The output shaft of the driving device (71) is movably connected to the rear side of the active frame (7) through a thread. A sealing strip (5) corresponding to the position of the driven frame (2) is provided on the inner side of the box door (3). A pressure sensor (8) that can contact the sealing strip (5) is installed on the front side of the box (1).

2. The explosion-proof structure with a transparent viewing window for an electricity metering box according to claim 1, characterized in that: The front edge of the box (1) is provided with an installation groove (102), and the box (1) is made of cast aluminum alloy. A hanging ring (101) is connected to the outside of the box (1).

3. The explosion-proof structure with a transparent viewing window for an electricity metering box according to claim 2, characterized in that: The driven frame (2) is connected to the mounting groove (102) by a telescopic spring. At the same time, a guide rod is connected between the driven frame (2) and the mounting groove (102). In the initial state, the outer side of the driven frame (2) protrudes from the front plane of the box (1).

4. The explosion-proof structure with a transparent window for an electricity metering box according to claim 1, characterized in that: The active frame (7) has the same shape and structure as the driven frame (2). The active frame (7) and the driven frame (2) are in the same position. The active frame (7) is movably connected to the inside of the box (1) through a guide rod. The active frame (7) is covered with a protective shell (9) connected to the inside of the box (1). The material of the protective shell (9) is the same as that of the box (1). The rear side of the active frame (7) is connected to an internally threaded cylinder arranged symmetrically on the upper and lower sides. The output shaft of the drive device (71) is connected to the threaded cylinder through a thread. The drive device (71) is connected to the power supply inside the box (1) and is controlled by the control system.

5. The explosion-proof structure with a transparent viewing window for an electricity metering box according to claim 1, characterized in that: The pressure sensor (8) is symmetrically installed on the upper and lower sides of the front of the housing (1), and the detection end of the pressure sensor (8) is in contact with the sealing strip (5). The pressure sensor (8) is connected to the control system and sends corresponding detection data.

6. The explosion-proof structure with a transparent viewing window for an electricity metering box according to claim 1, characterized in that: The sealing strip (5) is embedded in the door (3), and the sealing strip (5) is made of rubber. A groove (51) is provided in the middle of the sealing strip (5). The position of the groove (51) corresponds to the driven frame (2). The groove (51) is movably sleeved on the outside of the driven frame (2).

7. The explosion-proof structure with a transparent viewing window for an electricity metering box according to claim 1, characterized in that: The upper and lower ends of the outer side of the box door (3) are symmetrically connected with action blocks (31), and the action blocks (31) protrude towards the box body (1).

8. The explosion-proof structure with a transparent viewing window for an electricity metering box according to claim 2, characterized in that: The outer side of the box (1) is provided with a protective plate (4). The protective plate (4) has an arc-shaped structure. The top and bottom of the protective plate (4) are connected to the top and bottom of the box (1) through a connecting shaft (41). The connecting shaft (41) is a torsion spring shaft. A movable plate (411) is connected to one side of the movable end of the connecting shaft (41). The moving path of the movable plate (411) and the moving block (31) is on the same circle. When the box door (3) is closed, the moving block (31) exerts pressure on the movable plate (411) and causes the protective plate (4) to deflect to the front side of the box (1).

9. The explosion-proof structure with a transparent viewing window for an electricity metering box according to claim 8, characterized in that: A winding shaft (6) is installed on the outside of the protective plate (4). The winding shaft (6) is an elastic winding shaft. A fabric with a width greater than the transparent window on the box door (3) is wound on the winding shaft (6). The fabric is made of aramid fiber, and a hook (61) is connected to the outermost end of the fabric. The hook (61) is movably attached to the hanging ring (101).

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