Portable optical time domain reflectometer

Abstract

The utility model relates to the technical field of optical fiber monitoring devices, in particular to a portable optical time domain reflectometer. The utility model aims to solve the problem of poor heat dissipation performance. The portable optical time domain reflectometer comprises a shell, a main control board, an optical device, a power supply device, a heat absorption part and a heat dissipation device, the interior of the shell is hollow to form a mounting cavity, an opening communicated with the mounting cavity is formed in the surface of the shell, the main control board is supported in the mounting cavity and abuts against the opening, the optical device is arranged on the surface, back to the opening, of the main control board, the power supply device is arranged in the mounting cavity and abuts against the surface, back to the opening, of the main control board, and the heat absorption component covers the opening and abuts against the main control board. The heat dissipation device is arranged on the surface, back to the main control board, of the heat absorption component. The power supply device is electrically connected with the main control board, the optical device and the heat dissipation device, the heat absorption component is used for absorbing heat generated by the main control board, and the heat dissipation device is used for dissipating heat of the heat absorption component.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber monitoring devices, and more specifically, to a portable optical time domain reflectometer. Background Art

[0002] In terms of optical fiber detection and maintenance, it is usually necessary to use optical fiber detection equipment to measure optical fiber attenuation, joint loss, optical fiber fault point location, and understand the loss distribution along the length of the optical fiber. Optical fiber detection equipment can be used in project acceptance, daily inspections, fault repairs, and inventory optical cable route surveys. Due to the wide application range and many usage scenarios of optical fiber detection equipment, in order to facilitate the carrying of optical fiber detection equipment, the miniaturization of optical fiber detection equipment is particularly important.

[0003] In addition, since the optical fiber detection equipment usually needs to include heat-generating components such as circuit boards, lasers, and power supplies, it is also necessary to ensure a certain heat dissipation performance, otherwise it may have an adverse effect on the operation of the optical fiber detection equipment. Utility Model Content

[0004] The utility model aims to overcome at least one defect of the above-mentioned prior art and provide a portable optical time domain reflectometer to solve the problem of poor heat dissipation performance.

[0005] The technical solution adopted by the utility model is to provide a portable optical time domain reflectometer, including a housing, a main control board, an optical device, a power supply device, a heat absorbing component and a heat dissipation device;

[0006] The inner hollow of the shell forms an installation cavity, the surface of the shell has an opening communicating with the installation cavity, the main control board support is arranged in the installation cavity and close to the opening, the optical device is arranged on the surface of the main control board facing away from the opening, the power supply device is arranged in the installation cavity and close to the surface of the main control board facing away from the opening, the heat absorption component covers the opening and abuts against the main control board, and the heat dissipation device is arranged on the surface of the heat absorption component facing away from the main control board;

[0007] The power supply device is electrically connected to the main control board, the optical device and the heat dissipation device. The heat absorption component is used to absorb the heat generated by the main control board, and the heat dissipation device is used to dissipate the heat from the heat absorption component.

[0008] This solution covers the opening of the shell with a heat-absorbing component so that the heat-absorbing component is directly exposed to the external environment. Since the external environment of the shell is relatively low compared to the inside of the shell when the portable optical time-domain reflectometer is working, the heat dissipation efficiency of the heat-absorbing component can be significantly improved by means of the heat dissipation effect of the heat-dissipating device on the heat-absorbing component, thereby accelerating the cooling of the main control board that is thermally connected to the heat-absorbing component. In this case, when the main control board is the main heat-generating device of the portable optical time-domain reflectometer, this solution can obviously improve the heat dissipation efficiency of the portable optical time-domain reflectometer. In addition, the heat-absorbing component of this solution directly covers the opening of the shell installation cavity, acting as a cover, and the heat dissipation device is arranged on the surface of the heat-absorbing component. At this time, the inside of the shell only needs to be used to accommodate the main control board, optical devices and power supply devices, and no additional cover is required. Therefore, this solution can also promote the miniaturization of the shell space.

[0009] In some embodiments of the present utility model, the heat absorbing component is a metal heat conducting plate, and a mounting groove is provided on a surface of the metal heat conducting plate facing away from the opening, and the heat dissipation device is installed in the mounting groove.

[0010] The metal heat conducting plate of the present invention serves as both a heat absorbing component and a cover for the shell opening, and while ensuring good heat transfer performance between the main control board and the main control board, it can also prevent the portable optical time domain reflectometer from being too large in the direction perpendicular to the heat absorbing component when providing the cover function, thereby making the portable optical time domain reflectometer both miniaturized and having good heat dissipation performance. In addition, the assembly groove can protect the heat dissipation device, and the heat dissipation device is embedded on the surface of the heat absorbing component, which helps to further reduce the size of the portable optical time domain reflectometer in the direction perpendicular to the heat absorbing component and promote the miniaturization of the overall structure.

[0011] In some embodiments of the utility model, the heat dissipation device includes a heat dissipation fan, an air inlet is provided on the side of the assembly groove away from the metal heat conductive plate, an air outlet channel connected to the assembly groove is provided on the surface of the metal heat conductive plate, and the heat dissipation fan is used to drive air to flow from the air inlet to the air outlet channel.

[0012] This solution allows the flowing air to fully contact the metal heat conducting plate through the air outlet channel, thereby accelerating the heat dissipation of the metal heat conducting plate.

[0013] In some embodiments of the present invention, a fin structure is provided on the surface of the metal heat conducting plate.

[0014] This solution increases the surface area of ​​the metal heat conducting plate exposed to the external environment through the fin structure, thereby increasing the heat dissipation rate.

[0015] In some embodiments of the utility model, the fin structure includes a plurality of heat-conducting strips protruding from the surface of the metal heat-conducting plate, the heat-conducting strips are arranged with gaps between each other, and the gaps between the heat-conducting strips are connected to the assembly groove to form the air outlet channel.

[0016] In addition to increasing the heat exchange area of ​​the metal heat conducting plate, the fin structure of the present invention also forms a groove structure based on the gap between the heat conducting strips and the surface of the metal heat conducting plate. The port of the groove structure is connected to the assembly groove, and the other port is located at the outer periphery of the metal heat conducting plate, thereby driving the air introduced by the air inlet to fully contact the metal heat conducting plate through the groove structure, thereby accelerating the heat dissipation of the metal heat conducting plate.

[0017] In some embodiments of the present invention, the metal heat-conducting plate embedded cover covers the opening, and an air outlet connected to the air outlet channel is formed on a side surface of the shell.

[0018] This solution improves the connection strength between the metal heat conductive plate and the shell, so that the metal heat conductive plate and the main control board can maintain stable contact for efficient heat exchange. In addition, the air introduced from the air inlet is guided through the air outlet channel and the air outlet to fully contact the metal heat conductive plate, thereby improving the heat dissipation efficiency of the metal heat conductive plate.

[0019] In some embodiments of the utility model, a support structure is further provided in the installation cavity, the support structure is connected to the shell, the support structure supports the main control board on the side facing the opening, and the power supply device is assembled on the side of the support structure facing away from the opening.

[0020] This solution provides stable support for the main control board through the support structure, ensuring a stable thermal connection between the main control board and the heat absorbing component, thereby accelerating the heat dissipation of the main control board. In addition, the power supply device is assembled through the support structure, which can improve the installation stability between the internal structures of the installation cavity, thereby improving the overall structural strength of the portable optical time domain reflectometer.

[0021] In some embodiments of the present utility model, the support structure includes a support frame and a partition, the support frame is hollow and has support frame openings formed on both sides, the partition is connected to the support frame body and separates the support frame openings on both sides, and the support frame is connected to the shell;

[0022] The support frame supports the main control board at an end surface facing the opening, so that the partition plate is close to the surface of the main control board facing away from the opening;

[0023] The power supply device is mounted on a surface of the partition facing away from the opening.

[0024] This solution mainly supports the edges of the main control board on all sides through a supporting frame, and the partition is arranged close to the main control board. On the one hand, some structural parts protruding from the main control board can enable the main control board to obtain a certain support effect from the partition, thereby improving the installation stability of the main control board. On the other hand, a gap is left between the main control board and the partition, thereby promoting heat exchange between the main control board and the air in the shell and accelerating cooling.

[0025] In some implementations of the utility model, the partition is provided with an escape opening, and the escape opening is used to avoid the optical device.

[0026] This solution avoids direct contact between the partition and the optical device through the avoidance hole, ensures heat exchange between the optical device and the air in the shell, and facilitates the electrical connection between the optical device and the power supply device through the avoidance hole.

[0027] In some embodiments of the present utility model, a limiting seat is provided on a side of the partition facing away from the opening, and the limiting seat is embedded in at least a portion of the power supply device.

[0028] This solution improves the installation stability of the power supply device through the limit seat, and the embedded installation method reduces the distance between the power supply device and the main control board, which helps to promote the compact structure of the portable optical time domain reflectometer to improve portability.

[0029] In some embodiments of the utility model, a support member is protruding from the side of the partition facing away from the opening, and the support member is located in the space of the limit seat. The support member supports the power supply device so that a gap is left between the power supply device and the partition.

[0030] This solution sets the power supply device and the partition apart, which can improve the heat exchange level between the power supply device and the air in the shell and promote heat dissipation. At the same time, it is also convenient to layout the wires between the main control board, optical device and power supply device through the interval between the power supply device and the partition.

[0031] In some embodiments of the utility model, the shell includes a frame portion and a cover portion, the frame portion is hollow and has a first opening of the frame portion and a second opening of the frame portion formed on both sides respectively, the first opening of the frame portion serves as the opening, the cover portion covers the second opening of the frame portion, and the frame portion and the cover portion enclose to form the installation cavity.

[0032] In this solution, a housing is formed by combining a cover part and a frame part, which facilitates the assembly and disassembly of the portable optical time domain reflectometer as a whole, thereby accelerating the efficiency of installation and maintenance.

[0033] Compared with the prior art, the utility model has the following beneficial effects: by covering the opening of the shell with the heat absorbing component, the heat absorbing component is directly exposed to the external environment; at the same time, with the heat dissipation effect of the heat dissipation device on the heat absorbing component, the heat dissipation efficiency of the heat absorbing component can be significantly improved; in addition, the heat absorbing component plays the function of a cover, and the heat dissipation device is arranged on the surface of the heat absorbing component, which can optimize the device layout inside the shell and promote the miniaturization of the shell space; by arranging a fin structure on the surface of the heat absorbing component, the heat dissipation area can be increased, and an air outlet channel can be formed on the surface of the heat absorbing component based on the heat conductive strip of the fin structure, so as to guide the air flowing in from the air inlet to fully contact with the surface of the heat absorbing component, thereby accelerating the heat dissipation of the heat absorbing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural diagram of some implementation methods of the utility model.

[0035] Figure 2 The structure of some embodiments of the utility model Figure 2 .

[0036] Figure 3 Exploded diagram of the structure of some embodiments of the utility model

[0037] Figure 4 for Figure 3 Disassembly diagram of local structure A.

[0038] Figure 5 This is a disassembled diagram of the shell structure of some embodiments of the utility model.

[0039] Figure 6 This is a position diagram of the support structure and optical components of some embodiments of the present invention.

[0040] Figure 7 This is a structural diagram of the support structure of some embodiments of the utility model.

[0041] Figure 8 This is an assembly diagram of a power supply device and a support structure in some embodiments of the utility model.

[0042] Figure numerals: shell 100, frame part 110, first opening 111 of frame part, second opening 112 of frame part, cover part 120, air outlet 130, main control board 200, optical device 300, power supply device 400, heat absorption component 500, metal heat conductive plate 510, assembly groove 520, groove cover 530, through hole 531, fin structure 540, thermal conductive strip 541, air outlet channel 550, heat dissipation device 600, heat dissipation fan 610, support structure 700, support frame 710, partition 720, avoidance opening 721, limit seat 730, protruding member 731, support member 740, support frame opening 750. DETAILED DESCRIPTION

[0043] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0044] Example 1

[0045] like Figure 1 , 3 As shown in , 4 , this embodiment provides a portable optical time domain reflectometer, including a housing 100 , a main control board 200 , an optical device 300 , a power supply device 400 , a heat absorbing component 500 and a heat dissipation device 600 ;

[0046] The inner hollow of the housing 100 forms an installation cavity, the surface of the housing 100 has an opening communicating with the installation cavity, the main control board 200 is supported and arranged in the installation cavity and close to the opening, the optical device 300 is arranged on the surface of the main control board 200 facing away from the opening, the power supply device 400 is arranged in the installation cavity and close to the surface of the main control board 200 facing away from the opening, and the heat dissipation device 600 is arranged on the surface of the heat absorption component 500 facing away from the main control board 200;

[0047] The power supply device 400 is electrically connected to the main control board 200 , the optical device 300 , and the heat dissipation device 600 . The heat absorption component 500 is used to absorb the heat generated by the main control board 200 , and the heat dissipation device 600 is used to dissipate the heat from the heat absorption component 500 .

[0048] In specific implementation, the optical device 300 includes but is not limited to lasers, laser amplifiers, light sources, etc.; in addition, the main control board 200 may be provided with at least one of an ARM module, an MCU module, an optical filter, an optical circulator, a photodiode, and other devices.

[0049] During operation, since the heat absorbing component 500 covers the opening of the shell 100, the heat absorbing component 500 is directly exposed to the external environment. Since the external environment of the shell 100 is relatively low in temperature compared with the interior of the shell 100 when the portable optical time domain reflectometer is operating, the heat dissipation efficiency of the heat absorbing component 500 is improved by means of the heat dissipation effect of the heat dissipation device 600 on the heat absorbing component 500, thereby accelerating the cooling of the main control board 200 thermally connected to the heat absorbing component 500. It can be understood that in the case where the main control board 200 is used as the main heat generating device of the portable optical time domain reflectometer, the above layout can obviously improve the heat dissipation efficiency of the portable optical time domain reflectometer. In addition, since the heat absorbing component 500 directly covers the opening of the installation cavity of the shell 100, it can also serve as a cover, and the heat dissipation device 600 is arranged on the surface of the heat absorbing component 500. At this time, the interior of the shell 100 only needs to be used to accommodate the main control board 200, the optical device 300 and the power supply device 400, and there is no need to add an additional cover, which also helps to miniaturize the space of the shell 100.

[0050] refer to Figure 5 In order to facilitate the loading and unloading of the housing 100 during installation or maintenance, the housing 100 includes a frame portion 110 and a cover portion 120. The frame portion 110 is hollow and has a first frame portion opening 111 and a second frame portion opening 112 formed on both sides. The first frame portion opening 111 serves as the opening of the housing 100, and the cover portion 120 covers the second frame portion opening 112. The frame portion 110 and the cover portion 120 enclose a mounting cavity. It can be understood that if the position of the first frame portion opening 111 is taken as the top of the frame portion 110, the second frame portion opening 112 can be regarded as the bottom of the frame portion 110. At this time, refer to Figure 4 The main control board 200 and the power supply device 400 are arranged in a top-to-bottom manner and are arranged close to each other. The lower surface of the main control board 200 is used to set the optical device 300, so that the gap between the main control board 200 and the power supply device 400 is convenient for arranging functional components; and the heat absorbing component 500 is covered on the first opening 111 of the frame part and is in heat-conducting contact with the upper surface of the main control board 200. At this time, the heat absorbing component 500 also serves as the top cover of the shell 100, and the cover part 120 serves as the bottom cover of the shell 100, so that the two can be detachably covered from the top and bottom directions. The two openings of the frame part 110 are respectively arranged. At the same time, the heat absorbing component 500, the main control board 200, and the power supply device 400 are compactly arranged from top to bottom, reducing the size of the portable optical time domain reflectometer in the top and bottom directions. Among them, the power supply device 400 can be a storage battery.

[0051] refer to Figure 2-3 In some embodiments, the heat absorbing component 500 is a metal heat conducting plate 510, and a mounting groove 520 is provided on the surface of the metal heat conducting plate 510 facing away from the opening, and the mounting groove 520 is used to install the heat dissipation device 600. Figure 3 It is understood that the metal heat conducting plate 510 and the main control board 200 can be closely arranged through a connecting piece so that the two can maintain good heat transfer performance in a surface contact manner.

[0052] In actual application, the metal heat conducting plate 510 serves as both the heat absorbing component 500 and the cover of the opening of the housing 100. On the one hand, it can ensure good heat transfer performance between the main control board 200, and on the other hand, based on the light and thin characteristics of the metal heat conducting plate 510, it can also prevent the portable optical time domain reflectometer from being too large in the direction perpendicular to the heat absorbing component 500. In this way, the portable optical time domain reflectometer can take into account both miniaturization and good heat dissipation performance. In addition, the assembly groove 520 can fix and protect the heat dissipation device 600, and the heat dissipation device 600 is embedded on the surface of the heat absorbing component 500, which helps to further reduce the size of the portable optical time domain reflectometer in the direction perpendicular to the heat absorbing component 500.

[0053] refer to Figure 3 The heat dissipation device 600 includes a heat dissipation fan 610, an air inlet is provided on the side of the assembly slot 520 away from the metal heat conducting plate 510, and an air outlet channel 550 connected to the assembly slot 520 is provided on the surface of the metal heat conducting plate 510. The heat dissipation fan 610 is used to drive air from the air inlet to the air outlet channel 550. When implementing the specific Figure 3 ,, a slot cover 530 is provided on the assembly slot 520, and a plurality of through holes 531 are provided on the slot cover 530 as air inlets for the cooling fan 610, so that the slot cover 530 can also prevent dust and protect the cooling fan 610. Figure 2 In order to increase the heat dissipation area, a fin structure 540 is provided on the surface of the metal heat conductive plate 510. In some embodiments, in order to take into account the function of the air outlet channel 550, the fin structure 540 includes a plurality of heat conductive strips 541 protruding from the surface of the metal heat conductive plate 510. The plurality of heat conductive strips 541 are arranged with gaps between each other, and the gaps between the plurality of heat conductive strips 541 are connected to the assembly groove 520 to form the air outlet channel 550.

[0054] In actual operation, on the one hand, the fin structure 540 can increase the heat exchange area of ​​the metal heat conducting plate 510, and on the other hand, a groove structure is formed based on the gap between the heat conducting strips 541 and the surface of the metal heat conducting plate 510. Specifically, Figure 2 It is understood that one end opening of the slot structure is connected to the assembly slot 520, and the other end opening of the slot structure is located at the outer periphery of the metal heat conductive plate 510, thereby driving the air introduced into the assembly slot 520 from the air inlet to fully contact the metal heat conductive plate 510 through the guiding effect of the slot structure, that is, the slot structure plays the function of the air outlet channel 550, accelerating the heat dissipation of the metal heat conductive plate 510.

[0055] refer to Figure 1-2In some embodiments, the metal heat conducting plate 510 is embedded in the cover opening, and an air outlet 130 communicating with the air outlet channel 550 is provided on one side surface of the housing 100. It can be understood that the embedded installation can improve the connection strength between the metal heat conducting plate 510 and the housing 100, so that the metal heat conducting plate 510 and the main control board 200 can maintain stable contact to efficiently perform heat exchange. In addition, through the guiding effect of the air outlet channel 550 and the air outlet 130, the air introduced from the air inlet is fully in contact with the metal heat conducting plate 510, thereby improving the heat dissipation efficiency of the metal heat conducting plate 510.

[0056] Referring to the figure, in order to have better structural stability, a support structure 700 is also provided in the installation cavity, and the support structure 700 is connected to the housing 100. The side of the support structure 700 facing the opening supports the main control board 200, and the side of the support structure 700 facing away from the opening is equipped with a power supply device 400. It can be understood that the support structure 700 provides stable support for the main control board 200, ensuring a stable heat-conducting connection between the main control board 200 and the heat-absorbing component 500, so as to accelerate the heat dissipation of the main control board 200. In addition, by assembling the power supply device 400 through the support structure 700, the connection stability between the internal structures of the installation cavity can be improved, and the overall structural strength of the portable optical time domain reflectometer can be improved.

[0057] When implementing it, refer to Figure 4 , 6 The support structure 700 includes a support frame 710 and a partition 720. The support frame 710 is hollow and has support frame openings 750 formed on both sides. The partition 720 is connected to the support frame and separates the support frame openings 750 on both sides. The support frame 710 is connected to the shell 100. The end face of the support frame 710 facing the opening supports the main control board 200, so that the partition 720 is close to the surface of the main control board 200 facing away from the opening, and the power supply device 400 is assembled on the surface of the partition 720 facing away from the opening. Specifically, in combination with 4 and 6, the bottom support of the support frame 710 is arranged on the cover part 120, the main control board 200 is fixedly connected to the top outer peripheral edge of the support frame 710, and the partition 720 is arranged close to the main control board 200 with a certain gap therebetween. On the one hand, some structural parts protruding from the main control board 200 can enable the main control board 200 to obtain a certain support effect from the partition 720, thereby improving the installation stability of the main control board 200. On the other hand, a gap is left between most of the main control board 200 and the partition 720 to promote heat exchange between the main control board 200 and the air in the shell 100, thereby accelerating cooling.

[0058] Continue to refer Figure 6The partition 720 is provided with an avoidance opening 721, and the avoidance opening 721 is used to avoid the optical device 300. It is easy to understand that the avoidance opening 721 prevents the partition 720 from directly contacting the optical device 300, thereby ensuring heat exchange between the optical device 300 and the air in the shell 100. In addition, it is convenient for the wire to be electrically connected between the optical device 300 and the power supply device 400 through the avoidance hole.

[0059] refer to Figure 7-8 In some embodiments of the utility model, a stopper 730 is provided on the side of the partition 720 facing away from the opening, and the stopper 730 is embedded in at least a part of the power supply device 400, so that the installation stability of the power supply device 400 can be improved, and the embedded installation method also reduces the distance between the power supply device 400 and the main control board 200, so as to promote the compact structure of the portable optical time domain reflectometer, help the portable optical time domain reflectometer to be miniaturized, and improve portability. In specific implementation, in order to facilitate processing, the stopper 730 and the partition 720 are integrally formed, and specifically, the stopper 730 is formed by a plurality of raised components 731 formed on the partition 720.

[0060] Continuing with reference 7, a support member 740 is also protruded on the side of the partition 720 facing away from the opening. The support member 740 is located in the space of the limit seat 730. The support member 740 supports the power supply device 400 so that there is a gap between the power supply device 400 and the partition 720. The support member 740 allows the power supply device 400 and the partition 720 to be set apart, which can improve the heat exchange level between the power supply device 400 and the air in the housing 100, promote the heat dissipation of the power supply device 400, and at the same time, it is also convenient to arrange the wires between the main control board 200, the optical device 300 and the power supply device 400 through the gap between the power supply device 400 and the partition 720. In specific implementation, a certain length of optical fiber line needs to be arranged inside the portable optical time domain reflectometer. In order to make the layout regular, this embodiment is also provided with a winding component for winding the optical fiber line. During implementation, in order to simplify the structural layout inside the shell 100, the support member 740 is configured to be in a convex shape so that it can also be used as a winding component. At this time, most of the optical fiber lines are wound in the space of the limit seat 730, further promoting a compact layout in the installation cavity.

[0061] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A portable optical time domain reflectometer, characterized in that: It includes a housing, a main control board, an optical device, a power supply device, a heat absorbing component and a heat dissipation device; The inner hollow of the shell forms an installation cavity, the surface of the shell has an opening communicating with the installation cavity, the main control board support is arranged in the installation cavity and close to the opening, the optical device is arranged on the surface of the main control board facing away from the opening, the power supply device is arranged in the installation cavity and close to the surface of the main control board facing away from the opening, the heat absorption component covers the opening and abuts against the main control board, and the heat dissipation device is arranged on the surface of the heat absorption component facing away from the main control board; The power supply device is electrically connected to the main control board, the optical device and the heat dissipation device. The heat absorption component is used to absorb the heat generated by the main control board, and the heat dissipation device is used to dissipate the heat from the heat absorption component.

2. The portable optical time domain reflectometer according to claim 1, characterized in that: The heat absorbing component is a metal heat conducting plate. A mounting groove is provided on the surface of the metal heat conducting plate facing away from the opening, and the heat dissipation device is installed in the mounting groove.

3. The portable optical time domain reflectometer according to claim 2, characterized in that: The heat dissipation device includes a heat dissipation fan, an air inlet is provided on the side of the assembly slot away from the metal heat conductive plate, an air outlet channel connected to the assembly slot is provided on the surface of the metal heat conductive plate, and the heat dissipation fan is used to drive air to flow from the air inlet to the air outlet channel.

4. The portable optical time domain reflectometer according to claim 3, characterized in that: The surface of the metal heat conducting plate is provided with a fin structure.

5. The portable optical time domain reflectometer according to claim 4, characterized in that: The fin structure includes a plurality of heat-conducting strips protruding from the surface of the metal heat-conducting plate, the plurality of heat-conducting strips are arranged with gaps between them, and the gaps between the plurality of heat-conducting strips are connected to the assembly groove to form the air outlet channel.

6. The portable optical time domain reflectometer according to any one of claims 3 to 5, characterized in that: The metal heat-conducting plate embedded cover covers the opening, and an air outlet communicating with the air outlet channel is provided on one side surface of the shell.

7. The portable optical time domain reflectometer according to any one of claims 1 to 5, characterized in that: A supporting structure is also provided in the installation cavity, the supporting structure is connected to the shell, the side of the supporting structure facing the opening supports the main control board, and the side of the supporting structure facing away from the opening is equipped with the power supply device.

8. The portable optical time domain reflectometer according to claim 7, characterized in that: The support structure includes a support frame and a partition, the support frame is hollow and has support frame openings on both sides, the partition is connected to the support frame and separates the support frame openings on both sides, and the support frame is connected to the shell; The support frame supports the main control board at an end surface facing the opening, so that the partition plate is close to the surface of the main control board facing away from the opening; The power supply device is mounted on a surface of the partition facing away from the opening.

9. The portable optical time domain reflectometer according to claim 8, characterized in that: The partition is provided with an escape opening, and the escape opening is used to avoid the optical device; and / or, A limiting seat is provided on a side of the partition facing away from the opening, and the limiting seat is embedded in at least a part of the power supply device.

10. The portable optical time domain reflectometer according to claim 9, characterized in that: A support member is also protruded from the side of the partition facing away from the opening. The support member is located in the space of the limiting seat. The support member supports the power supply device so that a gap is left between the power supply device and the partition.

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