A protection switch device for an electric power measuring multimeter

Abstract

The present invention discloses a protection switch device for an electric power measurement multimeter, which includes a multimeter outer frame. A multimeter circuit board is arranged inside the multimeter outer frame, a protection structure is arranged on the back side of the multimeter circuit board, an outer frame back plate is arranged on the back side of the multimeter outer frame, and a sliding groove is opened at a position corresponding to the protection structure on the outer frame back plate, and a structure switch is arranged inside the sliding groove. The present invention relates to the technical field of multimeter protection equipment. For this protection switch device for an electric power measurement multimeter, when the current in the circuit measured by the multimeter is greater than the range of the multimeter, a larger current passes through the conductive coil, the magnetic field generated by the conductive coil increases, attracts the sliding block to push the thimble to move, and the locking rod is pushed out of the locking groove through the thimble, so as to release the locking of the extension table. At this time, the extension table is separated from the conductive plate under the influence of the extension spring, disconnecting the circuit, so as to protect the multimeter by disconnecting the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of multimeter protection devices, and more specifically, to a protection switch device for an electric power measurement multimeter. Background Art

[0002] A multimeter is a magnetoelectric instrument with a rectifier that can measure various electrical parameters such as alternating and direct current, voltage, and resistance.

[0003] The working environment of a multimeter is mostly to measure whether there is an abnormality in the measurement circuit. When measuring the circuit, if the circuit undergoes a short circuit, the current will instantaneously increase, and the abnormal current is very likely to exceed the range of the multimeter, easily causing the current inside the multimeter to be too large and damaging the multimeter;

[0004] In the prior art, most use fuses to protect the multimeter. However, after the fuse is used, it will blow, resulting in the multimeter being unable to be used. When continuing to repair the circuit, it is necessary to replace the fuse or replace another multimeter to measure the circuit again. Since most fuses are built into the multimeter, the efficiency of circuit repair will be greatly reduced.

[0005] Therefore, those skilled in the art have provided a protection switch device for an electric power measurement multimeter to solve the problems raised in the above background art. Summary of the Invention

[0006] The purpose of the present invention is to provide a protection switch device for an electric power measurement multimeter to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] The above technical purpose of the present invention is achieved through the following technical solutions:

[0009] A protection switch device for an electric power measurement multimeter includes a multimeter outer frame. Inside the multimeter outer frame, there is a multimeter circuit board. On the back side of the multimeter circuit board, there is a protection structure. On the back side of the multimeter outer frame, there is an outer frame back plate. At a position corresponding to the protection structure on the outer frame back plate, there is a sliding groove, and inside the sliding groove, there is a structure switch;

[0010] The protection structure includes a support plate. At the four corners of the support plate, there are support rods fixedly connected to the multimeter circuit board. On the side wall of the support plate, there is a sliding plate. At the end wall of the sliding plate, there is a fixed platform. Inside the sliding plate, there is an extending platform slidably arranged. Inside the extending platform, there is a locking structure. At the position opposite to the sliding plate at the upper end of the support plate, there is a connecting platform. Inside the connecting platform, there is a conductive coil, and at the end of the connecting platform, there is a conductive plate connected to the conductive coil. Inside the connecting platform, there is a triggering structure.

[0011] Further, the locking structure includes a rotating groove opened at the end of the extending platform. At the top of the extending platform, there is a rotating shaft, and on the outer peripheral wall of the rotating shaft, there is a locking rod rotatably arranged.

[0012] Further, the triggering structure includes a sliding groove opened inside the connecting platform. Inside the sliding groove, there is a sliding block slidably arranged. At one end of the sliding block, there is a thimble penetrating through the connecting platform, and at both ends of the sliding block, there are reset springs.

[0013] Further, the position of the thimble corresponds to the position of the locking rod, and the diameter of the thimble is smaller than the width of the rotating groove.

[0014] Further, the structure switch includes a switch sliding plate slidably installed inside the sliding groove. At the bottom end of the switch sliding plate, there is an extension rod. At the bottom end of the extension rod, there is a separation cylinder fixedly connected to the extending platform. Inside the separation cylinder, there is an extension spring connected to the fixed platform.

[0015] Further, inside the extension spring, there is an extension guide rod. The extension guide rod includes an outer sleeve tube and an inner sliding tube. The outer sleeve tube is fixedly connected to the separation cylinder, and the inner sliding tube is fixedly connected to the fixed platform.

[0016] Further, at the position near the end of the top of the sliding plate, there is a locking groove. When the extending platform contacts the guiding plate, the position of the locking rod corresponds to the position of the locking groove.

[0017] Further, at both ends of the switch sliding plate, there are extension plates, and the extension plates are mutually attached to the outer frame back plate.

[0018] In summary, the present invention includes at least one of the following beneficial technical effects:

[0019] 1. For this protection switch device for an electric power measurement multimeter, when the current in the circuit measured by the multimeter is greater than the range of the multimeter, a larger current passes through the conductive coil. The magnetic field generated by the conductive coil increases, attracting the sliding block to push the thimble to move, and the locking rod is pushed out of the locking groove through the thimble, thus unlocking the extending platform. At this time, under the influence of the extension spring, the extending platform is separated from the conductive plate, disconnecting the circuit, so as to protect the multimeter by disconnecting the circuit.

[0020] 2. For the protection switch device used in an electric power measurement multimeter, after the circuit is disconnected, the switch slide plate is pushed, so that the extension rod at the lower end of the switch slide plate pushes the extension table of the separation cylinder to move until the extension table contacts the conductive sheet. At the same time, the locking rod drops under the influence of the elastic sheet and cooperates with the locking groove to lock the extension table, so that the loop is closed again, and the multimeter can be quickly reset for the multimeter to be used again, which can effectively improve the efficiency of overhauling abnormal circuits. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a front structural schematic diagram of a protection switch device used in an electric power measurement multimeter of the present invention;

[0023] Figure 2 It is a back structural schematic diagram of a protection switch device used in an electric power measurement multimeter of the present invention;

[0024] Figure 3 It is an internal structural schematic diagram of the multimeter outer frame of a protection switch device used in an electric power measurement multimeter of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the protection structure of a protection switch device used in an electric power measurement multimeter of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the structure switch of a protection switch device used in an electric power measurement multimeter of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the trigger structure of a protection switch device used in an electric power measurement multimeter of the present invention;

[0028] Figure 7 It is a planar structural schematic diagram of the trigger structure and the locking structure of a protection switch device used in an electric power measurement multimeter of the present invention.

[0029] In the figure, 1 is the outer frame of the multimeter; 2 is the circuit board of the multimeter; 3 is the protection structure; 31 is the support plate; 32 is the support rod; 33 is the sliding plate; 34 is the fixed table; 35 is the extension table; 36 is the connecting table; 37 is the conductive coil; 38 is the conductive plate; 39 is the locking groove; 4 is the back plate of the outer frame; 5 is the sliding groove; 6 is the structure switch; 61 is the switch sliding plate; 62 is the extension rod; 63 is the separation cylinder; 64 is the extension spring; 65 is the outer sleeve; 66 is the inner sliding tube; 67 is the extension plate; 7 is the locking structure; 71 is the rotation groove; 72 is the rotating shaft; 73 is the locking rod; 8 is the trigger structure; 81 is the sliding groove; 82 is the sliding block; 83 is the thimble; 84 is the return spring. Detailed implementation manners

[0030] Next, with reference to the accompanying drawings and specific implementation manners, the invention will be further described:

[0031] Example: Refer to Figure 1 - Figure 7 A protection switch device for an electric power measurement multimeter disclosed by the present invention includes an outer frame 1 of the multimeter. A multimeter circuit board 2 is arranged inside the outer frame 1 of the multimeter. A protection structure 3 is arranged on the back side of the multimeter circuit board 2. A back plate 4 of the outer frame is arranged on the back side of the outer frame 1 of the multimeter. A sliding groove 5 is opened at a position corresponding to the protection structure 3 on the back plate 4 of the outer frame. A structure switch 6 is arranged inside the sliding groove 5;

[0032] The protection structure 3 includes a support plate 31. Support rods 32 fixedly connected to the multimeter circuit board 2 are arranged at the four corners of the support plate 31. A sliding plate 33 is arranged on the side wall of the support plate 31. A fixed table 34 is arranged on the end wall of the sliding plate 33. An extension table 35 is slidably arranged inside the sliding plate 33. A locking structure 7 is arranged inside the extension table 35. A connecting table 36 is arranged at a position opposite to the sliding plate 33 at the upper end of the support plate 31. A conductive coil 37 is arranged inside the connecting table 36, and a conductive plate 38 connected to the conductive coil 37 is arranged at the end of the connecting table 36. A trigger structure 8 is arranged inside the connecting table 36.

[0033] In this embodiment, as Figure 1 shown in the front structure schematic diagram of the multimeter, the front of the outer frame 1 of the multimeter includes a display screen, an adjustment knob, a multimeter switch, and four wire connectors;

[0034] When the multimeter is in normal use, the extension table 35 is in contact with the conductive plate 38, and both the conductive plate 38 and the extension table 35 are connected to the multimeter circuit board 2 through wires to form a closed loop. At this time, the locking structure 7 is in a locked state, as Figure 5 shown;

[0035] When the current in the circuit measured by the multimeter is greater than the range of the multimeter, a relatively large current passes through the conductive coil 37 to generate a magnetic field and push the trigger structure 8 to move. After the trigger structure 8 moves, it pushes the locking structure 7 to release the lock on the extension table 35. As Figure 7 shown, at this time, the extension table 35 is affected by the structure switch 6 and moves away from the conductive plate 38, disconnecting the circuit and achieving the purpose of disconnecting the circuit to protect the device.

[0036] In a further preferred embodiment of the present invention, as Figure 5 and Figure 7 shown, the locking structure 7 includes a rotating groove 71, which is opened at the end of the extension table 35. A rotating shaft 72 is provided at the top of the extension table 35, and a locking rod 73 is rotatably provided on the outer peripheral wall of the rotating shaft 72.

[0037] In this embodiment, when the extension table 35 slides to contact with the conductive plate 38, as Figure 7 shown, at this time, the locking rod 73 will fall into the locking groove 39 under the action of gravity. At this time, the locking rod 73 and the locking groove 39 are clamped with each other, thereby achieving the purpose of fixing the extension table 35. During the sliding process of the extension table 35, the extension spring 64 will be stretched, making the extension spring 64 extend and accumulate potential energy. After the locking structure 7 releases the lock, the extension table 35 will be pulled back to achieve the purpose of disconnecting the circuit.

[0038] In a further preferred embodiment of the present invention, as Figure 6 shown, the trigger structure 8 includes a sliding groove 81, which is opened inside the connecting table 36. A sliding block 82 is slidably provided inside the sliding groove 81. One end of the sliding block 82 is provided with a thimble 83 that penetrates the connecting table 36, and reset springs 84 are provided at both ends of the sliding block 82.

[0039] In this embodiment, the sliding groove 81 is used to install the sliding block 82. The sliding block 82 is made of metal and will be attracted by the magnetic field. The sliding block 82 is coaxially arranged with the conductive coil 37. When the current flowing in the conductive coil 37 is too large, the magnetic field generated by the conductive coil 37 increases, thereby attracting the sliding block 82 to slide inside the conductive coil 37. At this time, the sliding block 82 will push the thimble 83 to move and contact the locking rod 73. As Figure 7 shown, at this time, the locking rod 73 will be pushed out of the locking groove 39, thereby releasing the lock on the extension table 35. At this time, the extension table 35 is reset under the influence of the extension spring 64 to achieve the purpose of disconnecting the circuit.

[0040] In a further preferred embodiment of the present invention, as Figure 7 shown, the position of the thimble 83 corresponds to the position of the locking rod 73, and the diameter of the thimble 83 is smaller than the width of the rotating groove 71.

[0041] In this embodiment, since the width of the rotation groove 71 is greater than the diameter of the ejector pin 83, the ejector pin 83 can be inserted into the interior of the rotation groove 71 and push the locking lever 73 upward to achieve the purpose of unlocking the locking device.

[0042] In a further preferred embodiment of the present invention, as Figure 3 and Figure 5 shown, the structure switch 6 includes a switch slide plate 61 which is slidably installed inside the sliding groove 5. The bottom end of the switch slide plate 61 is provided with an extension rod 62, and the bottom end of the extension rod 62 is provided with a separation cylinder 63. The separation cylinder 63 is fixedly connected to the extension platform 35, and an extension spring 64 connected to the fixed platform 34 is arranged inside the separation cylinder 63.

[0043] In this embodiment, the switch slide plate 61 corresponds to the groove wall of the sliding groove 5 through the chutes on both sides, so that the switch slide plate 61 is slidably connected to the sliding groove 5. After the circuit is disconnected, the switch slide plate 61 can be manually pushed to make the extension rod at the low end of the switch slide plate 61 push the extension platform 35 to move through the separation cylinder 63 until the extension platform 35 contacts the conductive sheet. At the same time, the locking lever 73 falls under the influence of the elastic sheet 700 and cooperates with the lock groove 39 to lock the extension platform 35. And during the movement of the extension platform 35, the extension spring 64 will be stretched to store potential energy for the extension platform 35 to reset and disconnect the circuit.

[0044] In a further preferred embodiment of the present invention, as Figure 5 shown, an extension guide rod is arranged inside the extension spring 64. The extension guide rod includes an outer sleeve 65 and an inner sliding tube 66. The outer sleeve 65 is fixedly connected to the separation cylinder 63, and the inner sliding tube 66 is fixedly connected to the fixed platform 34.

[0045] In this embodiment, through the settings of the outer sleeve 65 and the inner sliding tube 66, the stretching direction of the extension spring 64 is guided, and damping is provided for the recovery of the extension spring 64 to reduce and prevent the extension spring 64 from jittering, so as to improve the stability of the device.

[0046] In a further preferred embodiment of the present invention, as Figure 5 and Figure 7 shown, a lock groove 39 is provided at a position near the end of the top end of the sliding plate 33. When the extension platform 35 contacts the guide plate, the position of the locking lever 73 corresponds to the position of the lock groove 39.

[0047] In this embodiment, the lock groove 39 is provided to cooperate with the locking lever 73 to lock the extension platform 35.

[0048] In a further preferred embodiment of the present invention, as Figure 3 shown, extension plates 67 are arranged at both ends of the switch slide plate 61, and the extension plates 67 are in mutual contact with the outer frame back plate 4.

[0049] In this embodiment, through the provision of the extension plate 67, it is used to block the notch of the sliding groove 5, enabling the switch slide plate 61 to slide and preventing external dust from entering the interior of the multimeter through the notch.

[0050] The implementation principle of the above embodiment is as follows: When the current in the circuit measured by the multimeter is greater than the range of the multimeter, the larger current passes through the conductive coil 37, and the magnetic field generated by the conductive coil 37 increases, thereby attracting the sliding block 82 to slide into the interior of the conductive coil 37. At this time, the sliding block 82 will push the thimble 83 to move and push the locking rod 73 out of the locking groove 39, thereby releasing the locking of the extension table 35. At this time, the extension table 35 is separated from the conductive plate 38 under the influence of the extension spring 64, disconnecting the circuit to achieve the purpose of protecting the multimeter by disconnecting the circuit;

[0051] And after the circuit is disconnected, by pushing the switch slide plate 61, the extension rod at the lower end of the switch slide plate 61 and the separation cylinder 63 push the extension table 35 to move until the extension table 35 contacts the conductive sheet. At the same time, the locking rod 73 drops to cooperate with the locking groove 39 to lock the extension table 35, closing the circuit again, enabling a quick reset process for the multimeter, facilitating the reuse of the multimeter, and effectively improving the efficiency of abnormal circuit maintenance.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protection switch device for an electric power measurement multimeter, characterized in that, It includes a multimeter outer frame (1). Inside the multimeter outer frame (1), there is a multimeter circuit board (2). On the back side of the multimeter circuit board (2), there is a protection structure (3). On the back side of the multimeter outer frame (1), there is an outer frame back plate (4). At a position corresponding to the protection structure (3) on the outer frame back plate (4), a sliding groove (5) is opened. Inside the sliding groove (5), there is a structure switch (6). The protection structure (3) includes a support plate (31). At the four corners of the support plate (31), there are support rods (32) fixedly connected to the multimeter circuit board (2). On the side wall of the support plate (31), there is a sliding plate (33). On the end wall of the sliding plate (33), there is a fixed platform (34). Inside the sliding plate (33), an extension platform (35) is slidably arranged. Inside the extension platform (35), there is a locking structure (7). At a position on the upper end of the support plate (31) opposite to the sliding plate (33), there is a communication platform (36). Inside the communication platform (36), there is a conductive coil (37), and at the end of the communication platform (36), there is a conductive plate (38) connected to the conductive coil (37). Inside the communication platform (36), there is a trigger structure (8).

2. The protection switch device for an electric power measurement multimeter according to claim 1, characterized in that, The locking structure (7) includes a rotation groove (71) opened at the end of the extension platform (35). At the top of the extension platform (35), there is a rotation shaft (72). On the outer peripheral wall of the rotation shaft (72), a locking rod (73) is rotatably arranged.

3. The protection switch device for an electric power measuring multimeter according to claim 2, wherein, The trigger structure (8) includes a sliding groove (81) opened inside the communication platform (36). Inside the sliding groove (81), a sliding block (82) is slidably arranged. At one end of the sliding block (82), there is a thimble (83) passing through the communication platform (36), and at both ends of the sliding block (82), there are return springs (84).

4. A protection switch device for an electric power measuring multimeter according to claim 3, characterized in that, The position of the thimble (83) corresponds to the position of the locking rod (73), and the diameter of the thimble (83) is smaller than the width of the rotation groove (71).

5. The protection switch device for an electric power measurement multimeter according to claim 4, characterized in that, The structure switch (6) includes a switch sliding plate (61) slidably installed inside the sliding groove (5). At the bottom end of the switch sliding plate (61), there is an extension rod (62). At the bottom end of the extension rod (62), there is a separation cylinder (63). The separation cylinder (63) is fixedly connected to the extension platform (35). Inside the separation cylinder (63), there is an extension spring (64) connected to the fixed platform (34).

6. The protection switch device for an electric power measuring multimeter according to claim 5, wherein, Inside the extension spring (64), there is an extension guide rod. The extension guide rod includes an outer sleeve (65) and an inner sliding tube (66). The outer sleeve (65) is fixedly connected to the separation cylinder (63), and the inner sliding tube (66) is fixedly connected to the fixed platform (34).

7. The protection switch device for an electric power measuring multimeter according to claim 6, characterized in that, At a position near the end of the top of the sliding plate (33), a lock groove (39) is opened. When the extension platform (35) contacts the guide plate, the position of the locking rod (73) corresponds to the position of the lock groove (39).

8. A protection switch device for an electric power measuring multimeter according to claim 7, characterized in that, At both ends of the switch sliding plate (61), there are extension plates (67), and the extension plates (67) are in mutual contact with the outer frame back plate (4).

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