Safe electric power meter convenient to maintain

Abstract

The invention relates to the technical field of electric power meters, in particular to a safe electric power meter convenient to maintain, which comprises two mounting frames, a meter shell and a meter main body, the meter shell is fixedly connected with the mounting frames through bolts, and the section of the meter shell is in a concave shape with an opening facing one side. The side wall of the mounting frame is fixedly connected with two binding posts, and the side wall of the instrument shell is provided with two post grooves; a power connection mechanism is arranged in the instrument shell, the power connection mechanism is composed of a plugging assembly and a switch assembly, the plugging assembly comprises a box cover, the switch assembly comprises a mounting groove formed in the top wall of the instrument shell, an insulating plate is slidably connected into the mounting groove, and two conductive blocks are fixedly connected to the side wall of the insulating plate; the instrument shell is rotatably connected with a rotating shaft through a bearing in a penetrating manner; and a safety mechanism is arranged in the instrument shell. The electric power meter has the advantages that the electric power meter is easier and more convenient to maintain, the electric shock risk is avoided, and the safety is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power meters, and in particular to a safe electric power meter that is easy to maintain. Background Art

[0002] Electricity is one of the most commonly used energy sources in our generation and life. Whether it is household tools or large-scale generation equipment in factories, most of them are driven by electricity. During the use of electricity, in order to ensure the normal and safe operation of the circuit, some power meters are needed to detect the circuit conditions. Power meters, in simple terms, are power measurement and control equipment that provide solutions for power parameter measurement, power quality monitoring and analysis, and electrical equipment control. Power meters have been widely used in various control systems, SCADA systems and energy management systems, substation automation, community power monitoring, industrial automation, smart buildings, smart distribution cabinets, switch cabinets and other equipment. During the use of power meters, in order to ensure the normal function of the power meters, it is usually necessary to maintain the power meters regularly.

[0003] In the prior art, power meters are generally directly connected to the circuit. During normal maintenance, if the meter is not disassembled for maintenance, it is live work, which poses a risk of electric shock and has low safety. If the meter is disassembled for maintenance, the circuit needs to be powered off and then disassembled. After disassembly, it needs to be installed again and the circuit needs to be powered on. This method is more cumbersome. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a safe power meter that is easy to maintain.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A safe electric power meter that is easy to maintain, comprising two mounting frames, a meter case and a meter body, wherein the meter case is fixedly connected to the mounting frames by bolts, the cross section of the meter case is a concave shape with an opening facing one side, two terminal posts are fixedly connected to the side wall of the mounting frame, and two column grooves are provided on the side wall of the meter case; The instrument housing is provided with a power connection mechanism, which is composed of a blocking assembly and a switch assembly. The blocking assembly includes a box cover, and the switch assembly includes a mounting groove provided in the top wall of the instrument housing, an insulating plate is slidably connected in the mounting groove, and two conductive blocks are fixedly connected to the side wall of the insulating plate. The instrument housing is rotatably connected to a rotating shaft through a bearing; A safety mechanism is arranged in the instrument housing, and the safety mechanism is composed of a temperature sensing component and a power-off component. The temperature sensing component includes a cavity opened in the top wall of the instrument housing, and the power-off component includes an electric push rod, and the electric push rod is fixedly connected to the bottom wall of the cavity.

[0006] Furthermore, the switch assembly also includes a magnetic block, which is slidably connected to the instrument housing through a mounting groove, and the side walls of the magnetic block on the opposite side of the insulating plate are respectively fixedly connected with a first rack and a second rack, and one end of the rotating shaft located in the mounting groove is fixedly connected with a first gear, and the first rack and the second rack are meshed with the first gear together, and the conductive block is electrically connected to the instrument body through a wire.

[0007] Furthermore, the blocking assembly also includes two side plates, the side plates are fixedly connected to the side walls of the instrument case, a fixing rod is fixedly connected between the two side plates, the box cover and the fixing rod are rotatably connected through a bearing, the box cover is provided with a hole, and a glass plate is fixedly embedded in the hole, the side wall of the box cover is fixedly connected to a fixing plate, the side wall of the box cover away from the fixing plate is fixedly connected to an electromagnet, the electromagnet is electrically connected to the conductive block through a wire, a sliding groove is provided on the bottom wall of the box cover, the box cover is slidably connected to an isolation block through the sliding groove, a plurality of third springs are fixedly connected between the isolation block and the top wall in the sliding groove, and a suction block is fixedly embedded in the side wall of the instrument case.

[0008] Furthermore, the temperature sensing component also includes a hollow liquid tank, which is fixedly connected to the inner wall of the instrument case, and a heat conduction plate is fixedly connected to the side wall of the liquid tank through it, and the instrument body and the side wall of the heat conduction plate are fixedly connected by bolts. The liquid tank is filled with phase change liquid, and the instrument case and the liquid tank are jointly penetrated and fixedly connected with a connecting tube, and the connecting tube connects the liquid tank with the cavity, and the connecting tube is sealingly and slidably connected with a moving block, and the side wall of the moving block located inside the cavity is fixedly connected with a third rack, and one end of the rotating shaft located in the cavity is fixedly connected with a second gear, and the side wall of the third rack away from the moving block is fixedly connected with a hook.

[0009] Furthermore, the power-off component also includes a sliding seat, which is fixedly connected to the output end of the electric push rod, a vertical rod is fixedly connected to the upper surface of the sliding seat, the vertical rod is rotatably connected to a rotating plate through a bearing, a second spring is fixedly connected between the rotating plate and the sliding seat, and a stop block is fixedly connected to the side wall of the sliding seat.

[0010] Furthermore, the third rack is a hollow structure, a trigger block is slidably connected inside the third rack, a first spring is fixedly connected between the trigger block and the inner side wall of the third rack, a button switch is fixedly connected to the inner side wall of the third rack, and the trigger block is made of magnetic material.

[0011] Furthermore, the phase change liquid is ethyl lactate.

[0012] Furthermore, the isolation block is made of silicon steel.

[0013] Furthermore, a sealing rubber ring is glued to the side wall of the box cover.

[0014] Furthermore, the inner side wall of the column groove is coated with an insulating coating.

[0015] The present invention has the following advantages: 1. Connect the line to the terminal, and connect the instrument body to the circuit through the contact between the conductive block and the terminal to monitor the circuit. If the instrument body needs to be maintained, the power will be cut off when the box cover is opened. At this time, the instrument body can be maintained without disassembly and installation, which makes maintenance more convenient. 2. When the box cover is opened for maintenance, the power supply of the instrument body can be cut off simultaneously, so that the instrument body will not be energized during the maintenance process, thus avoiding the risk of electric shock during the maintenance process and greatly improving safety; 3. When the instrument body is powered on, the electromagnet will also be powered on, generating magnetic attraction on the suction block. Through this magnetic attraction, the box cover and the instrument case are tightly attached, and the sealing rubber ring is set to prevent dust from entering the interior through the gap between the instrument case and the box cover, affecting the normal operation of the internal instrument body; 4. During the use of the instrument, the temperature of the instrument will be transferred to the phase change liquid through the heat conduction plate. After the temperature is transferred to the phase change liquid, when the temperature reaches a certain level, the state of the phase change liquid changes, thereby causing the internal pressure to change, and then causing the moving block to slide. The sliding of the moving block will cause the distance between the trigger block and the second gear to change. When the distance reaches a certain level, the trigger block will trigger the button switch, thereby triggering an alarm, monitoring the instrument temperature to a certain extent, and issuing an alarm in time when the temperature is abnormal, and taking timely measures to avoid more serious situations in the future; 5. When the temperature of the instrument reaches a certain level, the change in the state of the phase change liquid causes the moving block to drive the third rack to move, which will trigger an alarm on the one hand, and on the other hand, it will cause the third rack to mesh with the second gear and drive the first gear to rotate through the shaft, thereby cutting off the power supply of the instrument to avoid continued power-on heat generation and fire, further improving the safety of the instrument; 6. After an overheating power failure occurs, after the problem is solved, it is only necessary to cut off the power of the electric push rod and then power on the electric push rod to restore the overheating power failure function. It is not necessary to replace fuses and other protective items as in the prior art, thus making the function cycle more convenient; 7. When the instrument needs to be disassembled, the instrument case can be directly disassembled without cutting off the power of the circuit, making disassembly and installation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a safe power meter that is easy to maintain proposed by the present invention; Figure 2 A schematic diagram of the internal structure of a safe power meter that is easy to maintain proposed by the present invention; Figure 3 for Figure 2 A in the enlarged view; Figure 4 for Figure 2 The enlarged view of point B in the figure; Figure 5 A schematic diagram of the internal structure of a mounting slot in a safe power meter that is easy to maintain proposed by the present invention; Figure 6 A schematic diagram of the internal structure of a cavity in a safe power meter that is easy to maintain proposed by the present invention; Figure 7 for Figure 6 The enlarged view of point C in the figure; Figure 8 for Figure 6 The enlarged view of point D in the figure; Fig. 9 The present invention provides a schematic structural diagram of a mounting frame for a safe electric power meter that is easy to maintain.

[0017] In the figure: 1 mounting frame, 101 terminal, 2 instrument housing, 201 column slot, 202 suction block, 3 instrument body, 4 side plate, 5 fixing rod, 6 box cover, 7 glass plate, 8 mounting slot, 9 magnetic block, 10 fixing plate, 11 first rack, 12 rotating shaft, 13 first gear, 14 insulating plate, 15 second rack, 16 conductive block, 17 cavity, 18 connecting tube, 19 moving block, 20 liquid box, 21 heat conducting plate, 22 phase change liquid, 23 second gear, 24 third rack, 25 trigger block, 26 first spring, 27 button switch, 28 hook, 29 electric push rod, 30 sliding seat, 31 vertical rod, 32 rotating plate, 33 second spring, 34 stopper, 35 electromagnet, 36 sliding slot, 37 isolation block, 38 third spring. DETAILED DESCRIPTION

[0018] Reference Figure 1-Figure 9 A safe electric power meter that is easy to maintain, comprising two mounting frames 1, a meter case 2, and a meter body 3. The meter case 2 is fixedly connected to the mounting frame 1 by bolts. The cross section of the meter case 2 is a concave shape with an opening facing one side. Two terminal posts 101 are fixedly connected to the side wall of the mounting frame 1. The two terminal posts 101 are also electrically connected by wires. Two column grooves 201 are provided on the side wall of the meter case 2. An electric connection mechanism is arranged in the instrument housing 2, and the electric connection mechanism is composed of a blocking component and a switch component. The blocking component includes a box cover 6, and the switch component includes a mounting groove 8 provided in the top wall of the instrument housing 2, and an insulating plate 14 is slidably connected in the mounting groove 8, and two conductive blocks 16 are fixedly connected to the side wall of the insulating plate 14. The instrument housing 2 is rotatably connected to a rotating shaft 12 through a bearing. A safety mechanism is provided in the instrument housing 2 , which is composed of a temperature sensing component and a power-off component. The temperature sensing component includes a cavity 17 opened in the top wall of the instrument housing 2 , and the power-off component includes an electric push rod 29 , which is fixedly connected to the bottom wall of the cavity 17 .

[0019] The switch assembly also includes a magnetic block 9, which is slidably connected to the instrument case 2 through the mounting groove 8. The side walls of the magnetic block 9 on the opposite side of the insulating plate 14 are respectively fixedly connected with the first rack 11 and the second rack 15. The end of the rotating shaft 12 located in the mounting groove 8 is fixedly connected with the first gear 13. The first rack 11 and the second rack 15 are meshed with the first gear 13 together. The conductive block 16 is electrically connected to the instrument body 3 through a wire. When the box cover 6 is opened, the magnetic block 9 will be pushed into the mounting groove 8, and then the insulating plate 14 and the magnetic block 9 will move toward each other through the meshing of the first rack 11, the second rack 15 and the first gear 13, so that the conductive block 16 can be separated from the terminal 101, thereby cutting off the power to the instrument body 3. At this time, the instrument body 3 in the instrument case 2 can be maintained, thereby ensuring that the instrument body 3 is in a power-off state during maintenance, thereby avoiding the risk of electric shock caused by live operation.

[0020] The plugging assembly also includes two side panels 4, which are fixedly connected to the side walls of the instrument case 2. A fixing rod 5 is fixedly connected between the two side panels 4. The box cover 6 is rotatably connected to the fixing rod 5 through a bearing. The box cover 6 is provided with a hole, and a glass plate 7 is fixedly embedded in the hole. Through the setting of the glass plate 7, the condition inside the instrument case 2 can be observed more intuitively. The side wall of the box cover 6 is fixedly connected to a fixing plate 10, which is made of stainless steel and will be subject to the magnetic attraction of the magnetic block 9. The side wall of the box cover 6 away from the fixing plate 10 is fixedly connected to an electromagnet 35, and the electromagnet 35 is electrically connected to the conductive block 16 through a wire. When the instrument body 3 is energized, the electromagnet 35 will be energized. A sliding groove 36 is provided on the bottom wall of the box cover 6. The box cover 6 is slidably connected to an isolation block 37 through the sliding groove 36. The isolation block 37 is made of silicon steel. When the isolation block 37 made of silicon steel is inserted between the electromagnet 35 and the suction block 202, the magnetic force will be isolated to a certain extent. A plurality of third springs 38 are fixedly connected between the isolation block 37 and the inner top wall of the sliding groove 36. The side wall of the instrument case 2 is fixedly embedded with a suction block 202. The suction block 202 is made of stainless steel. When the electromagnet 35 is energized, a magnetic attraction will be generated thereon.

[0021] The temperature sensing component also includes a hollow liquid tank 20, which is fixedly connected to the inner wall of the instrument housing 2. A heat conducting plate 21 is fixedly connected to the side wall of the liquid tank 20. The instrument body 3 is fixedly connected to the side wall of the heat conducting plate 21 by bolts. The liquid tank 20 is filled with a phase change liquid 22, which is ethyl lactate. The boiling point of ethyl lactate is about 150°C. The internal temperature is detected by ethyl lactate. When the boiling point of ethyl lactate is reached, it means that the temperature in the instrument housing 2 is too high and needs to be handled in time, thereby The state of the phase change liquid 22 is used to monitor the temperature inside the instrument case 2. The instrument case 2 and the liquid tank 20 are fixedly connected with a connecting tube 18, which connects the liquid tank 20 with the cavity 17. The connecting tube 18 is sealed and slidably connected with a moving block 19. The side wall of the moving block 19 located inside the cavity 17 is fixedly connected with a third rack 24. One end of the rotating shaft 12 located in the cavity 17 is fixedly connected with a second gear 23. Under normal conditions, the third rack 24 and the second gear 23 are not in a meshing state (such as Figure 6 As shown), the rotation of the second gear 23 will not affect the third rack 24 when the switch box cover 6 is opened and closed. The second gear 23 is made of stainless steel. The side wall of the third rack 24 away from the moving block 19 is fixedly connected with a hook 28. If a serious situation such as fire or short circuit occurs, the temperature in the instrument housing 2 will rise instantly, so that the state of the phase change liquid 22 changes more rapidly. The moving block 19 will drive the third rack 24 to move rapidly, so that the third rack 24 meshes with the second gear 23 and drives the second gear 23 to rotate. The rotation of the second gear 23 will drive the first gear 13 to rotate through the rotating shaft 12. The rotation of the first gear 13 will mesh with the second rack 15, so that the insulating plate 14 drives the conductive block 16 to separate from the terminal 101, so that the meter body 3 is powered off to avoid fire caused by continued power on. During operation, the temperature in the instrument housing 2 is monitored in real time to improve the safety of the power meter.

[0022] The power-off assembly also includes a sliding seat 30, which is fixedly connected to the output end of the electric push rod 29. The electric push rod 29 is an electromagnetic push rod, which retracts when powered on and can be extended after power is off. A vertical rod 31 is fixedly connected to the upper surface of the sliding seat 30, and the vertical rod 31 is rotatably connected to a rotating plate 32 through a bearing. A second spring 33 is fixedly connected between the rotating plate 32 and the sliding seat 30, and a stopper 34 is fixedly connected to the side wall of the sliding seat 30. The setting of the stopper 34 allows the rotating plate 32 to rotate in only one direction, so that the hook 28 cannot continue to return after passing over the rotating plate 32, thereby preventing the instrument from being powered on again after the temperature is too high. During the movement of the rack 24, the hook 28 will move accordingly and contact the rotating plate 32, pushing the rotating plate 32 to rotate. When the hook 28 passes over the rotating plate 32, under the elastic force of the third spring 38, the rotating plate 32 is reset to block the hook 28, thereby preventing the hook 28 from returning. That is, if no corresponding treatment and inspection are performed, even if the temperature in the instrument case 2 returns to normal, the instrument body 3 will still remain in the power-off state until the staff performs corresponding treatment, so that the electric push rod 29 is powered on and then powered off, and normal operation can be restored to avoid the same problem when the temperature returns to normal and the power is turned on again, thereby further ensuring safety.

[0023] The third rack 24 is a hollow structure, and a trigger block 25 is slidably connected inside the third rack 24. A first spring 26 is fixedly connected between the trigger block 25 and the inner wall of the third rack 24. A button switch 27 is fixedly connected to the inner wall of the third rack 24. The button switch 27 is connected to an external alarm device. When pressed, the external alarm device can sound an alarm. The trigger block 25 is made of magnetic material. When the third rack 24 and the second gear 23 are close, the trigger block 25 will slide due to the increase of magnetic force until the button switch 27 is triggered. During the use of the instrument body 3, a certain amount of heat will be generated. If the heat is generated normally, the state of the phase change liquid 22 will not change. If the heat is generated abnormally, The higher temperature will change the state of the phase change liquid 22, thereby changing the pressure in the connecting tube 18. The change in pressure will cause the moving block 19 to move. The movement of the moving block 19 will cause the third rack 24 to move toward the second gear 23 and gradually approach the second gear 23. During the approaching process, the magnetic attraction of the trigger block 25 on the second gear 23 continues to increase. As the magnetic attraction increases, the trigger block 25 will move toward the button switch 27 until the button switch 27 is triggered, causing the external alarm to work. After the staff discovers the alarm, they will promptly repair the instrument body 3 to avoid more serious situations.

[0024] A sealing rubber ring is glued to the side wall of the box cover 6. Through the setting of the sealing rubber ring, the contact between the box cover 6 and the instrument case 2 is sealed to prevent dust from entering the instrument case 2 and affecting the operation of the instrument body 3.

[0025] The inner wall of the column groove 201 is coated with an insulating coating. The provision of the insulating coating makes the contact between the column groove 201 and the instrument housing 2 an insulating contact, thereby preventing electricity from directly entering the instrument housing 2 .

[0026] It should be noted that the metal components whose materials are not mentioned in the present invention are all made of aluminum alloy to avoid affecting the magnetic force.

[0027] In the present invention, after the wires of the circuit are connected to the terminal 101, the instrument housing 2 is installed on the mounting frame 1, and the box cover 6 is closed. When the box cover 6 is closed, the magnetic block 9 will slide under the action of the magnetic force as the box cover 6 rotates, thereby causing the first rack 11 to move, driving the first gear 13 to rotate, and the first gear 13 will drive the second rack 15 to move, thereby causing the insulating plate 14 to move away from the magnetic block 9, so that the conductive block 16 contacts the terminal 101, and then the instrument body 3 is energized.

[0028] When the meter body 3 is powered on, the electromagnet 35 is also powered on synchronously. After the electromagnet 35 is powered on, it will generate magnetic attraction on the suction block 202. Through the magnetic attraction, the box cover 6 and the meter case 2 are tightly attached.

[0029] If maintenance of the instrument body 3 is required, first push the isolation block 37 into the sliding groove 36. When the isolation block 37 is pushed into the sliding groove 36, it will be inserted between the electromagnet 35 and the suction block 202, thereby isolating the magnetic force between the two to a certain extent. At this time, the box cover 6 can be easily opened.

[0030] When the box cover 6 is opened, the magnetic block 9 will be pushed into the installation groove 8, and then the first rack 11, the second rack 15 and the first gear 13 will be engaged, so that the insulating plate 14 and the magnetic block 9 will move toward each other, and the conductive block 16 can be separated from the terminal 101, thereby cutting off the power to the instrument body 3. At this time, the instrument body 3 in the instrument case 2 can be maintained.

[0031] The instrument body 3 will generate a certain amount of heat during use. If the heat generation is normal, the state of the phase change liquid 22 will not change. If the heat generation is abnormal, the temperature will be relatively higher than that generated by normal use. The higher temperature will cause the state of the phase change liquid 22 to change, thereby causing the pressure in the connecting tube 18 to change. The change in pressure causes the moving block 19 to move. The movement of the moving block 19 will cause the third rack 24 to move toward the second gear 23 and gradually approach the second gear 23. During the approach process, the magnetic attraction of the trigger block 25 on the second gear 23 continues to increase. As the magnetic attraction increases, the trigger block 25 will move toward the button switch 27 until the button switch 27 is triggered, causing the external alarm to work. After the staff discovers the alarm, they will promptly inspect and repair the instrument body 3 to avoid more serious situations.

[0032] If a fire, short circuit or other serious situation occurs, the temperature inside the instrument housing 2 will rise instantly, causing the state of the phase change liquid 22 to change more rapidly, and the moving block 19 will drive the third rack 24 to move rapidly, so that the third rack 24 meshes with the second gear 23, and drives the second gear 23 to rotate. The rotation of the second gear 23 will drive the first gear 13 to rotate through the rotating shaft 12. The rotation of the first gear 13 will mesh with the second rack 15, so that the insulating plate 14 drives the conductive block 16 to separate from the terminal 101, so that the instrument body 3 is powered off to avoid fire caused by continued power supply.

[0033] During the movement of the third rack 24, the hook 28 will move accordingly and contact the rotating plate 32, pushing the rotating plate 32 to rotate. When the hook 28 passes over the rotating plate 32, the rotating plate 32 is reset under the elastic force of the third spring 38, blocking the hook 28, thereby preventing the hook 28 from returning. That is, if no corresponding treatment and inspection are performed, even if the temperature in the instrument case 2 returns to normal, the instrument body 3 will still remain in a power-off state until the staff performs corresponding treatment, so that the electric push rod 29 is energized and then de-energized, and normal operation can be restored.

Claims

1. A safe electric power meter that is easy to maintain, comprising two mounting frames (1), a meter housing (2), and a meter body (3), wherein the meter housing (2) and the mounting frames (1) are fixedly connected by bolts, and characterized in that: The cross section of the instrument housing (2) is a concave shape with the opening facing one side, the side wall of the mounting frame (1) is fixedly connected with two terminal posts (101), and the side wall of the instrument housing (2) is provided with two post grooves (201); The instrument housing (2) is provided with an electric connection mechanism, the electric connection mechanism being composed of a blocking assembly and a switch assembly, the blocking assembly comprising a box cover (6), the switch assembly comprising a mounting groove (8) provided in the top wall of the instrument housing (2), an insulating plate (14) being slidably connected in the mounting groove (8), two conductive blocks (16) being fixedly connected to the side wall of the insulating plate (14), and the instrument housing (2) being rotatably connected to a rotating shaft (12) penetrating through a bearing; A safety mechanism is provided in the instrument housing (2), the safety mechanism consisting of a temperature sensing component and a power-off component, the temperature sensing component comprising a cavity (17) opened in the top wall of the instrument housing (2), the power-off component comprising an electric push rod (29), the electric push rod (29) being fixedly connected to the bottom wall of the cavity (17).

2. A safe power meter that is easy to maintain according to claim 1, characterized in that: The switch assembly further comprises a magnetic block (9), wherein the magnetic block (9) is slidably connected to the instrument housing (2) via a mounting groove (8), a first rack (11) and a second rack (15) are respectively fixedly connected to the side wall of the magnetic block (9) on the side opposite to the insulating plate (14), an end of the rotating shaft (12) located in the mounting groove (8) is fixedly connected to a first gear (13), the first rack (11) and the second rack (15) are meshed with the first gear (13), and the conductive block (16) is electrically connected to the instrument body (3) via a wire.

3. The safe power meter that is easy to maintain according to claim 1 is characterized in that: The blocking assembly further comprises two side plates (4), the side plates (4) being fixedly connected to the side walls of the instrument housing (2), a fixing rod (5) being fixedly connected between the two side plates (4), the box cover (6) being rotatably connected to the fixing rod (5) via a bearing, the box cover (6) being provided with a hole, and a glass plate (7) being fixedly embedded in the hole, the side wall of the box cover (6) being fixedly connected to a fixing plate (10), the side wall of the box cover (6) being fixedly connected to an electromagnet (35) on a side away from the fixing plate (10), the electromagnet (35) being electrically connected to the conductive block (16) via a wire, the bottom wall of the box cover (6) being provided with a sliding groove (36), the box cover (6) being slidably connected to an isolation block (37) via the sliding groove (36), a plurality of third springs (38) being fixedly connected between the isolation block (37) and the inner top wall of the sliding groove (36), and a suction block (202) being fixedly embedded in the side wall of the instrument housing (2).

4. The safe power meter that is easy to maintain according to claim 1 is characterized in that: The temperature sensing component further comprises a hollow liquid tank (20), the liquid tank (20) being fixedly connected to the inner side wall of the instrument housing (2), a heat conducting plate (21) being fixedly connected to the side wall of the liquid tank (20), the instrument body (3) being fixedly connected to the side wall of the heat conducting plate (21) by bolts, the liquid tank (20) being filled with a phase change liquid (22), a connecting tube (18) being fixedly connected to the instrument housing (2) and the liquid tank (20), the connecting tube (18) connecting the liquid tank (20) with the cavity (17), the connecting tube (18) being sealingly and slidably connected to a moving block (19), a side wall of the moving block (19) located inside the cavity (17) being fixedly connected to a third rack (24), one end of the rotating shaft (12) located inside the cavity (17) being fixedly connected to a second gear (23), and a side wall of the third rack (24) being fixedly connected to a hook (28) away from the moving block (19).

5. The safe power meter that is easy to maintain according to claim 1 is characterized in that: The power-off assembly further comprises a sliding seat (30), wherein the sliding seat (30) is fixedly connected to the output end of the electric push rod (29), a vertical rod (31) is fixedly connected to the upper surface of the sliding seat (30), the vertical rod (31) is rotatably connected to a rotating plate (32) through a bearing, a second spring (33) is fixedly connected between the rotating plate (32) and the sliding seat (30), and a stopper (34) is fixedly connected to the side wall of the sliding seat (30).

6. A safe power meter that is easy to maintain according to claim 4, characterized in that: The third rack (24) is a hollow structure, a trigger block (25) is slidably connected inside the third rack (24), a first spring (26) is fixedly connected between the trigger block (25) and the inner side wall of the third rack (24), a button switch (27) is fixedly connected to the inner side wall of the third rack (24), and the trigger block (25) is made of a magnetic material.

7. The safe power meter that is easy to maintain according to claim 4, characterized in that: The phase change liquid (22) is ethyl lactate.

8. The safe power meter that is easy to maintain according to claim 3 is characterized in that: The isolation block (37) is made of silicon steel.

9. The safe power meter that is easy to maintain according to claim 3, characterized in that: A sealing rubber ring is glued to the side wall of the box cover (6).

10. The safe power meter that is easy to maintain according to claim 4, characterized in that: The inner side wall of the column groove (201) is coated with an insulating coating.

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