A detection device capable of passing the safety level of a multimeter and a multimeter

Abstract

The present invention discloses a detection device that can detect the safety level through a multimeter, which includes a mounting housing, a laser unit, a thermal imaging unit, and a visible light unit; the creepage distances and / or clearances of the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, and the sixth creepage path are all greater than 15 mm; a multimeter that can detect the safety level through a multimeter is also disclosed. The present invention optimally sets the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, and the sixth creepage path to ensure that the creepage distances and / or clearances between the laser unit, the thermal imaging unit, and the visible light unit meet the safety standard requirements of the multimeter, and meet the requirements of the field of view angle matching and fusion of the thermal imaging unit and the visible light unit, solving the problem that the existing detection device with a single thermal imaging function cannot be compatible with the functions of visible light imaging and laser ranging, or cannot pass the multimeter safety standard.

Description

Technical Field

[0001] The present invention relates to the technical field of instruments and meters, and particularly relates to a detection device for passing the safety level of a multimeter and a multimeter. Background Art

[0002] Adding a thermal imaging module to a multimeter with increasingly mature functions makes the combination more competitive in the market and better able to meet the diverse usage scenarios of users.

[0003] As is well known, a multimeter belongs to high-voltage products, so it needs to comply with the safety standards of multimeters. The infrared thermal imaging module belongs to low-voltage products. When the two are combined, the safety standards must be implemented according to the safety standards of multimeters. Therefore, it is necessary to consider whether the creepage distance and electrical clearance of the infrared thermal imaging module can meet the requirements of the multimeter's safety standards. At the same time, infrared thermal imaging products always come with the functions of adding visible light cameras and laser indicator modules. Therefore, not only the field of view angle matching and fusion between the visible light camera and the infrared thermal imaging module need to be considered, but also the creepage distance of the visible light camera and the laser indicator module needs to be considered. This is also the current situation where the thermal imaging multimeters on the market at present cannot pass the latest CE safety standards or cannot add visible light modules and laser modules.

[0004] The CTI III 1000V safety standard requires that the safety creepage distance and electrical clearance be greater than 15 mm. To achieve simultaneous compatibility with the infrared thermal imaging module, visible light camera, and laser indicator module, it is necessary to open hollow thermal imaging window holes, visible light window holes, and laser window holes. During high-voltage testing, the voltage will creep from each window hole to the internal module respectively. Therefore, in addition to meeting the performance of the infrared thermal imaging module, visible light camera, and laser indicator module, it is also necessary to prevent the voltage from creeping to the internal components. Summary of the Invention

[0005] In order to overcome the above technical problems, the present invention discloses a detection device for passing the safety level of a multimeter; and also discloses a multimeter for passing the safety level of a multimeter.

[0006] The technical solution adopted by the present invention to achieve the above object is:

[0007] A detection device for passing the safety level of a multimeter, comprising:

[0008] An installation housing, including a first cavity, a second cavity, and a third cavity arranged in parallel;

[0009] A laser unit, correspondingly arranged in the first cavity, for obtaining distance information of a target;

[0010] A thermal imaging unit, correspondingly arranged in the second cavity, for acquiring an infrared thermal imaging image of a target, which includes an infrared high-voltage insulating sheet;

[0011] A visible light unit, correspondingly arranged in the third cavity, for acquiring a visible light image of a target;

[0012] A first creepage path is formed successively along the upper and lower surfaces of the infrared high-voltage insulating sheet and the thermal imaging unit;

[0013] A second creepage path is formed successively along the upper surface of the infrared high-voltage insulating sheet, the mounting housing and the thermal imaging unit;

[0014] A third creepage path is formed successively along the upper surface of the infrared high-voltage insulating sheet, the upper surface of the laser unit and the mounting housing;

[0015] A fourth creepage path is formed successively along the upper surface of the infrared high-voltage insulating sheet, the upper surface of the visible light unit and the mounting housing;

[0016] A fifth creepage path is formed successively along the upper surface of the laser unit, the mounting housing, the lower surface of the infrared high-voltage insulating sheet and the thermal imaging unit;

[0017] A sixth creepage path is formed successively along the upper surface of the visible light unit, the mounting housing, the lower surface of the infrared high-voltage insulating sheet and the thermal imaging unit;

[0018] The creepage distance and / or the electrical clearance of the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path and the sixth creepage path are all greater than 15 mm.

[0019] The above-mentioned detection device with a safety level that can be passed by a multimeter, wherein the thermal imaging unit includes a silicon lens and a thermal imaging sensor respectively arranged outside and inside the infrared high-voltage insulating sheet, the thermal imaging sensor is electrically connected to a PCB board, and the silicon lens is parallel to the infrared high-voltage insulating sheet;

[0020] The silicon lens, the infrared high-voltage insulating sheet and the thermal imaging sensor successively form a thermal imaging path.

[0021] The above-mentioned detection device with a safety level that can be passed by a multimeter, wherein the mounting housing includes a protection part, a first light-transmitting part, a first creepage part and a first mounting part arranged in sequence from outside to inside. A sensor mounting seat is arranged on the first mounting part, the thermal imaging sensor and the PCB board are arranged in the sensor mounting seat, and a first light-transmitting hole corresponding to the second cavity is arranged through the sensor mounting seat;

[0022] A first stepped groove, a second stepped groove, a third stepped groove, and a fourth stepped groove with gradually decreasing aperture are respectively provided around the protection part, the first light-transmitting part, the first creepage part, and the first installation part. The first stepped groove, the second stepped groove, the third stepped groove, and the fourth stepped groove are sequentially connected to form the second cavity;

[0023] The silicon lens is horizontally arranged in the second stepped groove, the infrared high-voltage insulating sheet is horizontally arranged between the second stepped groove and the third stepped groove, and the upper and lower surfaces of the infrared high-voltage insulating sheet are flush with the second stepped groove and the third stepped groove respectively.

[0024] The above-mentioned detection device that can pass the safety level of the multimeter, wherein the laser unit includes a laser lens and a laser module, and the laser lens is horizontally arranged between the first cavity and the laser module;

[0025] The first cavity, the laser lens, and the laser module sequentially form a laser detection path.

[0026] The above-mentioned detection device that can pass the safety level of the multimeter, wherein the installation housing further includes a second light-transmitting part, a second creepage part, and a second installation part arranged in sequence from outside to inside. A first through hole is provided through the second light-transmitting part, and the first cavity is provided in the hollow of the first through hole;

[0027] A first module mounting seat is provided on the second installation part corresponding to the first through hole, the laser module is arranged in the first module mounting seat, and a second light-transmitting hole is provided through the first module mounting seat corresponding to the first cavity;

[0028] The laser lens is horizontally arranged in the second creepage part corresponding to the second light-transmitting hole, the upper surface of the laser lens is flush with the second creepage part, and the second creepage part is communicated with the first creepage part.

[0029] The above-mentioned detection device that can pass the safety level of the multimeter, wherein the visible light unit includes a visible light lens and a visible light camera module, and the visible light lens is horizontally arranged between the third cavity and the visible light camera module;

[0030] The third cavity, the visible light lens, and the visible light camera module sequentially form a visible light imaging path.

[0031] The above-mentioned detection device that can pass the safety level of the multimeter, wherein the installation housing further includes a third light-transmitting part, a third creepage part, and a third installation part arranged in sequence from outside to inside. A second through hole is provided through the third light-transmitting part, the third cavity is provided in the hollow of the second through hole, and a fifth stepped groove is provided around the second through hole;

[0032] A second module mounting base is provided corresponding to the second through hole in the second mounting portion, and the visible light module is disposed in the second module mounting base. A third light-transmitting hole is provided through the second module mounting base corresponding to the third cavity;

[0033] The visible light lens is horizontally disposed in the third creepage portion corresponding to the third light-transmitting hole. The upper surface of the visible light lens is flush with the third creepage portion, and the third creepage portion is communicated with the first creepage portion.

[0034] In the above-mentioned detection device capable of passing the safety level of the multimeter, the installation height of the visible light imaging module in the horizontal direction is higher than the installation height of the thermal imaging sensor;

[0035] An extension protrusion is provided between the first creepage portion and the third creepage portion to increase the creepage distance and / or the electrical clearance of the fourth creepage path and / or the sixth creepage path.

[0036] In the above-mentioned detection device capable of passing the safety level of the multimeter, the first creepage path is formed by sequentially following the upper surface, side wall and lower surface of the infrared high-voltage insulating sheet, the third stepped groove, the fourth stepped groove and the thermal imaging sensor;

[0037] The second creepage path is formed by sequentially following the upper surface of the infrared high-voltage insulating sheet, the first creepage portion, the first mounting portion and the PCB board;

[0038] The third creepage path is formed by sequentially following the upper surface of the infrared high-voltage insulating sheet, the first creepage portion, the upper surface of the laser lens and the second creepage portion;

[0039] The fourth creepage path is formed by sequentially following the upper surface of the infrared high-voltage insulating sheet, the first creepage portion, the extension protrusion, the upper surface of the visible light lens and the third creepage portion;

[0040] The fifth creepage path is formed by sequentially following the upper surface of the laser lens, the first creepage portion, the lower surface of the infrared high-voltage insulating sheet, the third stepped groove, the fourth stepped groove and the thermal imaging sensor;

[0041] The sixth creepage path is formed by sequentially following the upper surface of the visible light lens, the third creepage portion, the extension protrusion, the lower surface of the infrared high-voltage insulating sheet, the third stepped groove, the fourth stepped groove and the thermal imaging sensor;

[0042] The seventh creepage path is formed by sequentially following the upper surface of the laser lens, the first creepage portion and the laser module;

[0043] The eighth creepage path is formed by sequentially following the upper surface of the visible light lens, the third creepage portion and the visible light imaging module;

[0044] The creepage distances and / or clearance distances of the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, the sixth creepage path, the seventh creepage path, and the eighth creepage path are all greater than 15 mm.

[0045] A multimeter that can pass the multimeter safety level, which includes the detection device that can pass the multimeter safety level described above.

[0046] The beneficial effects of the present invention include the following points:

[0047] (1) In the present invention, by providing the first cavity, the second cavity, and the third cavity, the detection device innovatively and simultaneously accommodates the laser unit, the thermal imaging unit, and the visible light unit, so as to enable the detection device to satisfy the infrared thermal imaging function while adding the functions of visible light imaging and laser ranging;

[0048] (2) Optimally setting the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, and the sixth creepage path to ensure that the creepage distances and / or clearance distances between the laser unit, the thermal imaging unit, and the visible light unit meet the safety standard requirements of the multimeter, passing the CTI III 1000V safety standard, and meeting the requirements of the field of view angle matching and fusion of the thermal imaging unit and the visible light unit, solving the problem that the detection devices with a single thermal imaging function on the existing market cannot be compatible with the functions of visible light imaging and laser ranging, or cannot pass the multimeter safety standard;

[0049] (3) Innovatively setting the infrared high-voltage insulating sheet, which can not only meet the insulation requirements of a high voltage of 10000V, but also allow infrared light with a wavelength of 7 - 14 nm to pass through, and the infrared light transmittance reaches 80%, meeting the thermal imaging requirements; when performing a high-voltage test, the voltage cannot break down the infrared high-voltage insulating sheet, and can only creep along the surface of the infrared high-voltage insulating sheet and the first creepage part, effectively increasing the creepage distance, which can not only meet the creepage distance or clearance distance of 15 mm, but also meet the requirement of the setting distance limit between the thermal imaging unit and the installation housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described below with reference to the drawings and embodiments.

[0051] Figure 1 It is a rear view schematic diagram of the multimeter that can pass the multimeter safety level in the present invention;

[0052] Figure 2 It is a three-dimensional schematic diagram of the detection device that can pass the multimeter safety level in the present invention;

[0053] Figure 3 It is a sectional view schematic diagram of the detection device that can pass the multimeter safety level in the present invention. Detailed implementation manners

[0054] The present invention will be further described below through specific embodiments, so that the technical solution of the present invention is easier to understand and master, rather than limiting the present invention.

[0055] Embodiment: Refer to Figures 1 to 3 , a detection device capable of detecting the safety level of a multimeter provided in this embodiment includes:

[0056] An installation housing 2, including a first cavity 21, a second cavity 22, and a third cavity 23 arranged in parallel; specifically, the first cavity 21 is a laser window hole, the second cavity 22 is a thermal imaging window hole, and the third cavity 23 is a visible light window hole;

[0057] A laser unit, correspondingly arranged in the first cavity 21, for obtaining the distance information of the target;

[0058] A thermal imaging unit, correspondingly arranged in the second cavity 22, for obtaining an infrared thermal imaging image of the target, which includes an infrared high-voltage insulating sheet 42;

[0059] A visible light unit, correspondingly arranged in the third cavity 23, for obtaining a visible light image of the target;

[0060] A first creepage path is formed in sequence along the upper and lower surfaces of the infrared high-voltage insulating sheet 42 and the thermal imaging unit;

[0061] A second creepage path is formed in sequence along the upper surface of the infrared high-voltage insulating sheet 42, the installation housing 2, and the thermal imaging unit;

[0062] A third creepage path is formed in sequence along the upper surface of the infrared high-voltage insulating sheet 42, the upper surface of the laser unit, and the installation housing 2;

[0063] A fourth creepage path is formed in sequence along the upper surface of the infrared high-voltage insulating sheet 42, the upper surface of the visible light unit, and the installation housing 2;

[0064] A fifth creepage path is formed in sequence along the upper surface of the laser unit, the installation housing 2, the lower surface of the infrared high-voltage insulating sheet 42, and the thermal imaging unit;

[0065] A sixth creepage path is formed in sequence along the upper surface of the visible light unit, the installation housing 2, the lower surface of the infrared high-voltage insulating sheet 42, and the thermal imaging unit;

[0066] The creepage distance and / or the electrical clearance of the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, and the sixth creepage path are all greater than 15 mm.

[0067] Specifically, by providing the first cavity 21, the second cavity 22, and the third cavity 23, the detection device innovatively and simultaneously accommodates the laser unit, the thermal imaging unit, and the visible light unit, so as to enable the detection device to satisfy the infrared thermal imaging function while adding the functions of visible light imaging and laser ranging. Secondly, the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, and the sixth creepage path are optimized and set to ensure that the creepage distance and / or the electrical clearance between the laser unit, the thermal imaging unit, and the visible light unit meet the safety standard requirements of the multimeter. By passing the CTI III 1000V safety standard, the requirements for the field of view matching and fusion of the thermal imaging unit and the visible light unit are achieved, solving the problems that the detection devices with a single thermal imaging function on the existing market cannot accommodate the functions of visible light imaging and laser ranging, or cannot pass the multimeter safety standard.

[0068] Preferably, the thermal imaging unit includes a silicon lens 41 and a thermal imaging sensor 43 respectively arranged on the outer side and the inner side of the infrared high-voltage insulating sheet 42. The thermal imaging sensor 43 is electrically connected to a PCB board 44, and the silicon lens 41 is parallel to the infrared high-voltage insulating sheet 42;

[0069] The silicon lens 41, the infrared high-voltage insulating sheet 42, and the thermal imaging sensor 43 sequentially form a thermal imaging path.

[0070] Further, the installation housing 2 includes a protection part, a first light-transmitting part, a first creepage part, and a first installation part arranged in sequence from outside to inside. A sensor mounting seat is arranged on the first installation part. The thermal imaging sensor 43 and the PCB board 44 are arranged in the sensor mounting seat. A first light-transmitting hole corresponding to the second cavity 22 is provided through the sensor mounting seat;

[0071] A first stepped groove, a second stepped groove, a third stepped groove, and a fourth stepped groove with gradually decreasing apertures are respectively provided through the protection part, the first light-transmitting part, the first creepage part, and the first installation part in a ring shape. The first stepped groove, the second stepped groove, the third stepped groove, and the fourth stepped groove are sequentially connected to form the second cavity 22;

[0072] The silicon lens 41 is horizontally arranged in the second stepped groove, the infrared high-voltage insulating sheet 42 is horizontally arranged between the second stepped groove and the third stepped groove, and the upper and lower surfaces of the infrared high-voltage insulating sheet 42 are flush with the second stepped groove and the third stepped groove respectively.

[0073] Specifically, since the apertures of the first stepped groove, the second stepped groove, the third stepped groove, and the fourth stepped groove gradually decrease, the formed second cavity 22 is a horn-shaped FOV window, meeting the FOV window angle requirements of the thermal imaging sensor 43. On the one hand, it ensures that infrared light with a wavelength of 7 - 14 nm enters the second cavity 22, and on the other hand, it ensures that the creepage distance and / or the electrical clearance meet the safety standard requirements. If the distance between the installation housing 2 and the thermal imaging unit is relatively far, although the safety standard requirements can be met, the set aperture of the second cavity 22 is too large. At the same time, due to the FOV window angle requirements of the visible light unit, the window angle of the second cavity 22 will block the window angle of the third cavity 23, and the independent setting of the second cavity 22 and the third cavity 23 cannot be satisfied, that is, the independent setting of the thermal imaging window hole and the visible light window hole cannot be satisfied. Therefore, in this embodiment, the infrared high-voltage insulating sheet 42 is innovatively set, which can not only meet the insulation requirements of a high voltage of 10,000 V but also allow infrared light with a wavelength of 7 - 14 nm to pass through, and the infrared light transmittance reaches 80%, meeting the thermal imaging requirements. When a high-voltage test is carried out, the voltage cannot break down the infrared high-voltage insulating sheet 42, and only can creep along the surface of the infrared high-voltage insulating sheet 42 and the first creepage part, effectively increasing the creepage distance, which can not only meet the creepage distance or electrical clearance of 15 mm but also meet the setting distance limitation requirements between the thermal imaging unit and the installation housing 2.

[0074] Preferably, the laser unit includes a laser lens 31 and a laser module 32, and the laser lens 31 is horizontally arranged between the first cavity 21 and the laser module 32; specifically, the laser lens 31 is a laser lens 31 with high transmittance, and the laser lens 31 can transmit laser and meet the requirement of not being broken down during a high-voltage test;

[0075] The first cavity 21, the laser lens 31, and the laser module 32 sequentially form a laser detection path.

[0076] Further, the installation housing 2 further includes a second light-transmitting part, a second creepage part, and a second installation part which are sequentially arranged from outside to inside. A first through-hole is provided through the second light-transmitting part, and the first cavity 21 is provided in the hollow of the first through-hole;

[0077] A first module mounting seat is provided on the second installation part corresponding to the first through-hole, the laser module 32 is arranged in the first module mounting seat, and a second light-transmitting hole is provided through the first module mounting seat corresponding to the first cavity 21;

[0078] The laser lens 31 is horizontally arranged in the second creepage part corresponding to the second light-transmitting hole, the upper surface of the laser lens 31 is flush with the second creepage part, and the second creepage part is communicated with the first creepage part.

[0079] Specifically, when preparing the installation housing 2 by injection molding, the plastic material of the installation housing 2 is fused with the lens material of the laser lens 31, that is, the laser lens 31 and the second creepage portion are integrated into a whole, which not only satisfies the outward emission of the laser beam, but also ensures that the voltage cannot break down the laser lens 31 during the high-voltage test, and at the same time, it satisfies that the voltage cannot directly creep to the position of the internal laser module 32. The voltage can only creep along the second creepage portion, and the shape and size of the second creepage portion can be adjusted according to actual requirements, so as to meet the safety standard requirements that the creepage distance and / or the electrical clearance are greater than 15 mm.

[0080] Preferably, the visible light unit includes a visible light lens 51 and a visible light camera module 52. The visible light lens 51 is horizontally arranged between the third cavity 23 and the visible light camera module 52. Specifically, the visible light lens 51 is a visible light lens 51 with a high transmittance, which can transmit visible light and meet the requirement of not being broken down during the high-voltage test.

[0081] The third cavity 23, the visible light lens 51 and the visible light camera module 52 sequentially form a visible light imaging path.

[0082] Furthermore, the installation housing 2 further includes a third light-transmitting portion, a third creepage portion and a third installation portion which are arranged from outside to inside in sequence. A second through hole is provided through the third light-transmitting portion. The third cavity 23 is provided in the hollow of the second through hole, and a fifth stepped groove is provided around the second through hole. Specifically, the aperture of the fifth stepped groove gradually decreases, and the formed third cavity 23 is a horn-shaped FOV window, which meets the FOV window angle requirement of the visible light camera module 52 and ensures that visible light enters the third cavity 23.

[0083] A second module mounting seat is provided on the second installation portion corresponding to the second through hole. The visible light module is arranged in the second module mounting seat, and a third light-transmitting hole is provided through the second module mounting seat corresponding to the third cavity 23.

[0084] The visible light lens 51 is horizontally arranged in the third creepage portion corresponding to the third light-transmitting hole. The upper surface of the visible light lens 51 is flush with the third creepage portion, and the third creepage portion is communicated with the first creepage portion.

[0085] Specifically, when preparing the injection-molded mounting housing 2, the plastic material of the mounting housing 2 is fused with the lens material of the visible light lens 51, that is, the visible light lens 51 and the third creepage portion are fused into a whole, which not only ensures that visible light can pass through the visible light lens 51 and be captured and imaged by the visible light imaging module 52, but also ensures that the voltage cannot break down the visible light lens 51 during the high-voltage test, and meets the requirement that the voltage cannot directly creep to the position of the internal visible light imaging module 52. The voltage can only creep along the third creepage portion, and the third creepage portion can be adjusted in shape and size according to actual needs, so as to meet the safety standard requirements that the creepage distance and / or the electrical clearance are greater than 15 mm.

[0086] Further, due to the problem of image fusion between the visible light imaging module 52 and the thermal imaging sensor 43, it is required to satisfy the coincidence of the FOV at a certain distance, that is, there are restrictions on the axial distance and the horizontal height position between the two. Therefore, in this embodiment, the installation height of the visible light imaging module 52 is higher than that of the thermal imaging sensor 43 in the horizontal direction, which can not only ensure that the visible light window hole is not too large, but also ensure that the visible light window hole and the thermal imaging window hole can be formed independently;

[0087] Due to the problem of light fusion between the visible light imaging module 52 and the thermal imaging sensor 43, it is required that the axial distance between the visible light window hole and the thermal imaging window hole cannot be greater than 15 mm. In order to meet the safety standard requirements at the same time, an extension protrusion 45 is provided between the first creepage portion and the third creepage portion to increase the creepage distance and / or the electrical clearance of the fourth creepage path and / or the sixth creepage path.

[0088] Specifically, the following creepage paths are included in this embodiment:

[0089] (1) The voltage creeps from the second cavity 22 towards the thermal imaging sensor 43, that is, from the thermal imaging window hole towards the thermal imaging sensor 43:

[0090] The first creepage path is formed by sequentially passing through the upper surface, side wall and lower surface of the infrared high-voltage insulating sheet 42, the third stepped groove, the fourth stepped groove and the thermal imaging sensor 43;

[0091] (2) The voltage creeps from the second cavity 22 towards the PCB board 44, that is, from the thermal imaging window hole towards the PCB board 44:

[0092] The second creepage path is formed by sequentially passing through the upper surface of the infrared high-voltage insulating sheet 42, the first creepage portion, the first mounting portion and the PCB board 44;

[0093] (3) The voltage creeps from the second cavity 22 towards the laser module 32, that is, from the thermal imaging window hole towards the laser module 32:

[0094] The third creepage path is formed successively along the upper surface of the infrared high-voltage insulating sheet 42, the first creepage portion, the upper surface of the laser lens 31, and the second creepage portion;

[0095] (4) The voltage creeps from the second cavity 22 in the direction of the visible light imaging module 52, that is, from the thermal imaging window hole in the direction of the visible light imaging module 52:

[0096] The fourth creepage path is formed successively along the upper surface of the infrared high-voltage insulating sheet 42, the first creepage portion, the extended protrusion 45, the upper surface of the visible light lens 51, and the third creepage portion;

[0097] (5) The voltage creeps from the first cavity 21 in the direction of the thermal imaging sensor 43, that is, from the laser window hole in the direction of the thermal imaging sensor 43:

[0098] The fifth creepage path is formed successively along the upper surface of the laser lens 31, the first creepage portion, the lower surface of the infrared high-voltage insulating sheet 42, the third stepped groove, the fourth stepped groove, and the thermal imaging sensor 43;

[0099] (6) The voltage creeps from the third cavity 23 in the direction of the thermal imaging sensor 43, that is, from the visible light window hole in the direction of the thermal imaging sensor 43:

[0100] The sixth creepage path is formed successively along the upper surface of the visible light lens 51, the third creepage portion, the extended protrusion 45, the lower surface of the infrared high-voltage insulating sheet 42, the third stepped groove, the fourth stepped groove, and the thermal imaging sensor 43;

[0101] (7) The voltage creeps from the first cavity 21 in the direction of the laser module 32, that is, from the laser window hole in the direction of the laser module 32:

[0102] The seventh creepage path is formed successively along the upper surface of the laser lens 31, the first creepage portion, and the laser module 32;

[0103] (8) The voltage creeps from the third cavity 23 in the direction of the visible light imaging module 52, that is, from the visible light window hole in the direction of the visible light module:

[0104] The eighth creepage path is formed successively along the upper surface of the visible light lens 51, the third creepage portion, and the visible light imaging module 52;

[0105] The creepage distances and / or the electrical clearances of the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, the sixth creepage path, the seventh creepage path, and the eighth creepage path are all greater than 15 mm.

[0106] In a specific embodiment, the installation housing 2 includes an outer shell and a protection box. The outer shell is integrally formed by the protection part, the first light-transmitting part, the second light-transmitting part, and the third light-transmitting part. The protection box is integrally formed by the first creepage part, the second creepage part, and the third creepage part.

[0107] This embodiment also discloses a multimeter that can pass the multimeter safety level, which includes the detection device 1 that can pass the multimeter safety level described above.

[0108] The design of the present invention is reasonable and ingenious. By setting the first cavity, the second cavity, and the third cavity, the detection device innovatively and simultaneously accommodates the laser unit, the thermal imaging unit, and the visible light unit, so as to realize that while the detection device satisfies the infrared thermal imaging function, it also increases the functions of visible light imaging and laser ranging. Secondly, the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, and the sixth creepage path are optimized and set to ensure that the creepage distance and / or the electrical clearance between the laser unit, the thermal imaging unit, and the visible light unit meet the safety standard requirements of the multimeter. By passing the CTI III 1000V safety standard, the requirements for the field of view angle matching and fusion of the thermal imaging unit and the visible light unit are achieved, and the problems that the detection devices with a single thermal imaging function on the existing market cannot be compatible with the functions of visible light imaging and laser ranging, or cannot pass the multimeter safety standard are solved.

[0109] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, all equivalent changes made according to the shape, structure, and principle of the present invention without departing from the content of the technical solution of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A detection device for the safety level of a multimeter, characterized in that, It includes: An installation housing, including a first cavity, a second cavity, and a third cavity arranged in parallel; A laser unit, correspondingly arranged in the first cavity, for obtaining distance information of a target; A thermal imaging unit, correspondingly arranged in the second cavity, for obtaining an infrared thermal imaging image of a target, which includes an infrared high-voltage insulating sheet, a thermal imaging sensor, and a PCB board. The thermal imaging sensor is arranged inside the infrared high-voltage insulating sheet, and the thermal imaging sensor is electrically connected to the PCB board; A visible light unit, correspondingly arranged in the third cavity, for obtaining a visible light image of a target; A first creepage circuit path is formed successively along the upper and lower surfaces of the infrared high-voltage insulating sheet and the thermal imaging sensor; A second creepage circuit path is formed successively along the upper surface of the infrared high-voltage insulating sheet, the installation housing, and the PCB board; A third creepage circuit path is formed successively along the upper surface of the infrared high-voltage insulating sheet, the upper surface of the laser unit, and the installation housing; A fourth creepage circuit path is formed successively along the upper surface of the infrared high-voltage insulating sheet, the upper surface of the visible light unit, and the installation housing; A fifth creepage circuit path is formed successively along the upper surface of the laser unit, the installation housing, the lower surface of the infrared high-voltage insulating sheet, and the thermal imaging sensor; A sixth creepage circuit path is formed successively along the upper surface of the visible light unit, the installation housing, the lower surface of the infrared high-voltage insulating sheet, and the thermal imaging sensor; The creepage distance and / or the electrical clearance of the first creepage circuit path, the second creepage circuit path, the third creepage circuit path, the fourth creepage circuit path, the fifth creepage circuit path, and the sixth creepage circuit path are all greater than 15 mm; Wherein, the laser unit includes a laser lens and a laser module, and the laser lens is horizontally arranged between the first cavity and the laser module; The first cavity, the laser lens, and the laser module successively form a laser detection path; The installation housing further includes a second light-transmitting part, a second creepage part, and a second installation part arranged from outside to inside in sequence. A first through hole is provided through the second light-transmitting part, and the first cavity is provided in the hollow of the first through hole; A first module mounting seat is provided on the second installation part corresponding to the first through hole, the laser module is arranged in the first module mounting seat, and a second light-transmitting hole is provided through the first module mounting seat corresponding to the first cavity; The laser lens is horizontally arranged in the second creepage part corresponding to the second light-transmitting hole, and the upper surface of the laser lens is flush with the second creepage part; The laser lens and the second creepage part are integrated into a whole.

2. The detection device capable of passing the safety level of a multimeter according to claim 1, characterized in that, The thermal imaging unit includes a silicon lens arranged outside the infrared high-voltage insulating sheet, and the silicon lens is parallel to the infrared high-voltage insulating sheet; The silicon lens, the infrared high-voltage insulating sheet, and the thermal imaging sensor successively form an imaging path of thermal imaging.

3. The detection device for the safety level that can be passed through a multimeter according to claim 2, characterized in that, The installation housing includes a protection part, a first light-transmitting part, a first creepage part, and a first installation part arranged from outside to inside in sequence. A sensor mounting seat is provided on the first installation part, the thermal imaging sensor and the PCB board are arranged in the sensor mounting seat, and a first light-transmitting hole is provided through the sensor mounting seat corresponding to the second cavity; A first stepped groove, a second stepped groove, a third stepped groove, and a fourth stepped groove with gradually decreasing apertures are respectively provided in a surrounding manner through the protection part, the first light-transmitting part, the first creepage part, and the first mounting part. The first stepped groove, the second stepped groove, the third stepped groove, and the fourth stepped groove are sequentially connected to form the second cavity; The silicon lens is horizontally arranged in the second stepped groove. The infrared high-voltage insulating sheet is horizontally arranged between the second stepped groove and the third stepped groove. The upper and lower surfaces of the infrared high-voltage insulating sheet are flush with the second stepped groove and the third stepped groove respectively.

4. The detection device for the safety level that can be passed through a multimeter according to claim 3, characterized in that, The second creepage part is communicated with the first creepage part.

5. The detection device for the safety level that can be passed by a multimeter according to claim 4, characterized in that, The visible light unit includes a visible light lens and a visible light camera module. The visible light lens is horizontally arranged between the third cavity and the visible light camera module; The third cavity, the visible light lens, and the visible light camera module sequentially form a visible light imaging path.

6. The detection device capable of passing the safety level of a multimeter according to claim 5, characterized in that, The mounting housing further includes a third light-transmitting part, a third creepage part, and a third mounting part which are arranged in sequence from outside to inside. A second through hole is provided through the third light-transmitting part. The second through hole is hollow and provided with the third cavity. A fifth stepped groove is provided in a surrounding manner around the second through hole; A second module mounting seat is provided on the third mounting part corresponding to the second through hole. The visible light camera module is arranged in the second module mounting seat. A third light-transmitting hole is provided through the second module mounting seat corresponding to the third cavity; The visible light lens is horizontally arranged in the third creepage part corresponding to the third light-transmitting hole. The upper surface of the visible light lens is flush with the third creepage part. The third creepage part is communicated with the first creepage part.

7. The detection device for the safety level that can be passed by a multimeter according to claim 6, wherein, The installation height of the visible light camera module in the horizontal direction is higher than the installation height of the thermal imaging sensor; An extension protrusion is provided between the first creepage part and the third creepage part to increase the creepage distance and / or the electrical clearance of the fourth creepage path and / or the sixth creepage path.

8. The detection device for the safety level that can be passed through a multimeter according to claim 7, characterized in that, The first creepage path is formed sequentially along the upper surface, the side wall and the lower surface of the infrared high-voltage insulating sheet, the third stepped groove, the fourth stepped groove, and the thermal imaging sensor; The second creepage path is formed sequentially along the upper surface of the infrared high-voltage insulating sheet, the first creepage part, the first mounting part, and the PCB board; The third creepage path is formed sequentially along the upper surface of the infrared high-voltage insulating sheet, the first creepage part, the upper surface of the laser lens, and the second creepage part; The fourth creepage path is formed sequentially along the upper surface of the infrared high-voltage insulating sheet, the first creepage part, the extension protrusion, the upper surface of the visible light lens, and the third creepage part; The fifth creepage path is formed sequentially along the upper surface of the laser lens, the first creepage part, the lower surface of the infrared high-voltage insulating sheet, the third stepped groove, the fourth stepped groove, and the thermal imaging sensor; The sixth creepage path is formed sequentially along the upper surface of the visible light lens, the third creepage part, the extension protrusion, the lower surface of the infrared high-voltage insulating sheet, the third stepped groove, the fourth stepped groove, and the thermal imaging sensor; The seventh creepage path is formed sequentially along the upper surface of the laser lens, the first creepage part, and the laser module; The eighth creepage path is formed sequentially along the upper surface of the visible light lens, the third creepage part, and the visible light camera module; The creepage distances and / or clearance distances of the first creepage path, the second creepage path, the third creepage path, the fourth creepage path, the fifth creepage path, the sixth creepage path, the seventh creepage path, and the eighth creepage path are all greater than 15 mm.

9. A multimeter that can pass the safety level of a multimeter, characterized in that, It includes the detection device with the safety level that can be passed by a multimeter according to any one of claims 1 to 8.

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