Contact resistance testing device for junction box

Abstract

The utility model belongs to the technical field of junction box testing, and discloses a junction box contact resistance testing device. The junction box contact resistance testing device comprises a base and an abutting assembly, the base is provided with a limiting groove set, the limiting groove set comprises two limiting grooves arranged at intervals, box bodies of two junction boxes can be limited in the two limiting grooves respectively, the base is further provided with a connecting groove, the connecting groove is communicated with the two limiting grooves, the limiting grooves are used for containing bus bars, and the abutting assembly is used for abutting against the bus bars. Therefore, the bus bar is communicated with the probes of the two junction boxes. The pressing assembly is arranged on the base, and the pressing assembly is used for pressing the box body so as to press the probe on the bus bar. The limiting groove group is arranged to position the box body to be tested, and the probes in the two limiting grooves are connected through the bus bar, so that the contact resistance of the contact points of the probes can be tested and calculated by using the two junction boxes. The pressing assembly is arranged to press the box body, so that the probe can be stably pressed on the bus bar so as to be fully contacted with the bus bar.

Description

Technical Field

[0001] The utility model relates to the technical field of junction box testing, in particular to a junction box contact resistance testing device. Background Art

[0002] Photovoltaic glass curtain wall is the integration of photovoltaic power generation and building materials. The basic unit of the photovoltaic glass curtain wall is a battery array composed of several polycrystalline silicon solar cells connected in series and parallel. The photovoltaic glass curtain wall is formed by encapsulating polycrystalline silicon solar cells in double-layer tempered glass. The photovoltaic glass curtain wall, controller, battery, and inverter can form an independent photovoltaic power generation system to supply power to the building owner, or directly supply power to the grid through inverter and generate power on the grid. The photovoltaic glass curtain wall has a firm structure, sound insulation, beautification of the building, energy saving and environmental protection, and reduces work and management costs. It can create direct economic benefits and can be widely used in the roofs, walls, photovoltaic smart doors and windows of buildings.

[0003] The glass curtain wall junction box uses the probe to make point contact with the busbar. Abnormal contact resistance can easily cause the product power to fail to meet the standards. Due to the presence of rectifier diodes in the glass curtain wall junction box, it is impossible to directly test the loop resistance of a single set of junction boxes, and it is impossible to calculate the contact resistance of the probe contact point. In addition, the contact resistance value of the probe is small and has a certain degree of volatility. It is impossible to achieve product measurement using a resistance tester alone.

[0004] Therefore, there is an urgent need for a junction box contact resistance testing device to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a junction box contact resistance testing device, which can connect the probes of two junction boxes, so as to calculate the contact resistance of the probe contact point by testing the loop resistance of the two junction boxes.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Junction box contact resistance test device, including:

[0008] A base, wherein a limiting groove group is provided on the base, wherein the limiting groove group includes two limiting grooves arranged at intervals, and the box bodies of the two junction boxes can be respectively limited in the two limiting grooves, and the base is also provided with a connecting groove, wherein the connecting groove communicates with the two limiting grooves, and the limiting groove is used to accommodate a bus bar so that the bus bar communicates with the probes of the two junction boxes;

[0009] The pressing component is arranged on the base, and is used for pressing the box body to press the probe against the bus bar.

[0010] As an optional solution, the junction box includes two box bodies, the two box bodies are in a mirror-image structure, two groups of limit groove groups are provided on the base, and the two limit grooves in the two groups of limit groove groups accommodating the same junction box are in a mirror-image shape.

[0011] As an optional solution, an avoidance groove is also provided on the base, one end of the avoidance groove is connected to the limiting groove, and the other end of the avoidance groove is connected to the edge of the base. When the box body is placed in the limiting groove, the cable of the junction box is limited in the avoidance groove.

[0012] As an optional solution, the depth of the connecting groove is greater than the depth of the limiting groove, and the connecting groove extends into the limiting groove, so that the upper surface of the bus bar is lower than the bottom of the limiting groove.

[0013] As an optional solution, the pressing assembly includes a support member and a weight, the support member is arranged on the base, and the weight is slidably arranged on the support member so as to be able to slide downward to press the box body in the limiting groove or slide upward to avoid the limiting groove.

[0014] As an optional solution, the support member includes a support column and a rotating connecting rod, the bottom end of the support column is arranged on the base, one end of the rotating connecting rod is rotatably connected to the top end of the support column, and the other end of the rotating connecting rod is slidably provided with the weight.

[0015] As an optional solution, the rotating connecting rod includes a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are rotatably connected, the second connecting rod is rotatably connected to the supporting column, and the weight is slidably arranged on the first connecting rod.

[0016] As an optional solution, there are two groups of limit slot groups, and the support column is arranged between each of the limit slots in the two groups of limit slot groups. Rotating the rotating connecting rod can rotate the weight to align with each of the limit slots in the two groups of limit slot groups.

[0017] As an optional solution, the weight includes a pressure head and a sliding column connected to each other, the sliding column is slidably connected to the support member, and pulling the sliding column can move the pressure head upward to separate from the box body in the limiting groove.

[0018] As an optional solution, a boss is provided at one end of the sliding column away from the pressure head, and the boss can abut against the support member.

[0019] Beneficial effects:

[0020] The junction box contact resistance test device proposed in the utility model positions the box body to be tested by setting a limit groove group, and connects the probes in the two limit grooves through a bus bar, so as to realize the contact resistance calculation of the probe contact point by using two junction boxes for testing. The box body is pressed by setting a pressing component, so that the probe can be firmly pressed on the bus bar to fully contact with the bus bar.

[0021] When testing the probe contact resistance of the junction box, place the busbar in the connection slot, and then place the two junction box bodies in the two limit slots respectively, so that the probes of the two boxes are in contact with the busbar to achieve connectivity. Use a resistance tester to measure the total resistance value R in the circuit where the two tested boxes are located, the resistance values ​​R1 and R2 from the two boxes to the connectors connected to them, and the resistance value R3 between the contact points of the test busbar and the two probes, and then calculate the contact resistance value R4 of a single probe = (R-R1-R2-R3) / 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a junction box provided by an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 The enlarged structure diagram at A in the middle;

[0024] Figure 3 It is a structural schematic diagram of a junction box contact resistance testing device provided by an embodiment of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a junction box contact resistance testing device and a junction box provided in an embodiment of the utility model;

[0026] Figure 5 It is a schematic diagram of the abutment structure between the probe and the bus bar provided by an embodiment of the utility model;

[0027] Figure 6 yes Figure 5 The enlarged structure diagram at B in the middle;

[0028] Figure 7 It is a schematic diagram of the test principle of the resistor R provided in the embodiment of the utility model;

[0029] Figure 8 It is a schematic diagram of the test principle of the resistors R1 and R2 provided in the embodiment of the utility model;

[0030] Fig. 9 It is a schematic diagram of the test principle of the resistor R3 provided in the embodiment of the utility model;

[0031] Fig.10It is a structural schematic diagram of the pressing assembly provided by an embodiment of the utility model.

[0032] In the figure:

[0033] 100, junction box; 110, box body; 120, probe; 130, cable; 140, connector;

[0034] 1. Base; 11. Limiting groove group; 111. Limiting groove; 12. Connecting groove; 13. Avoiding groove;

[0035] 2. pressing assembly; 21. supporting member; 211. supporting column; 212. rotating connecting rod; 2121. first connecting rod; 2122. second connecting rod; 22. weight; 221. pressing head; 222. sliding column; 2221. boss;

[0036] 3. Bus bar; 31. Contact point. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figure 1 and Figure 2 As shown, a junction box 100 includes two box bodies 110, a cable 130 and a connector 140. The box body 110 is provided with a probe 120, and the probe 120 extends out of the box body 110 under the elastic force of the spring inside the box body 110. The two box bodies 110 are connected by the cable 130, and the end of the cable 130 passing through the box body 110 is provided with a connector 140. The junction box 100 is a conventional structure in the prior art, and its specific structure and working principle are not described in detail here.

[0042] In order to test the contact resistance of the probe contact point, such as Figure 3-Figure 6 As shown, this embodiment provides a junction box contact resistance test device, including a base 1, a bus bar 3 and a pressing assembly 2. A limiting groove group 11 is provided on the base 1. The limiting groove group 11 includes two limiting grooves 111 arranged at intervals. The box bodies 110 of the two junction boxes 100 can be limited in the two limiting grooves 111 respectively. The base 1 is also provided with a connecting groove 12. The connecting groove 12 connects the two limiting grooves 111. The limiting groove 111 is used to accommodate the bus bar 3 so that the bus bar 3 connects the probes 120 of the two junction boxes 100. The pressing assembly 2 is provided on the base 1, and the pressing assembly 2 is used to press the box body 110 so as to press the probe 120 against the bus bar 3. Specifically, the base 1 is made of marble and has good insulation properties to facilitate the direct placement of the bus bar 3.

[0043] The box body 110 to be tested is positioned by setting the limit groove group 11, and the probes 120 in the two limit grooves 111 are connected through the bus bar 3, so as to realize the contact resistance of the probe contact point to be tested and calculated using two junction boxes 100. The box body 110 is pressed by setting the pressing assembly 2, so that the probe 120 can be firmly pressed on the bus bar 3 to fully contact the bus bar 3.

[0044] When testing the contact resistance of the probe 120 of the junction box 100, place the bus bar 3 into the connection slot 12, and then place the box bodies 110 of the two junction boxes 100 into the two limiting slots 111 respectively, so that the probes 120 of the two box bodies 110 are in contact with the bus bar 3 to achieve connection. Figure 7-Figure 9As shown, by using a resistance tester to measure the total resistance value R in the circuit where the two tested box bodies 110 are located, the resistance values ​​R1 and R2 from the two box bodies 110 to the connectors 140 connected thereto, and the resistance value R3 between the contact points 31 of the test bus bar 3 and the two probes 120, the contact resistance value R4 = (R-R1-R2-R3) / 2 of a single probe 120 can be calculated.

[0045] Optionally, the shape and size of the limiting groove 111 match the box body 110, and a slight gap is maintained between the box body 110 and the inner wall of the limiting groove 111, which can prevent the box body 110 from shaking randomly in the limiting groove 111, so that there is no relative displacement after the probe 120 contacts the bus bar 3, thereby making the measurement more accurate.

[0046] For further information, please refer back to Figure 3 and Figure 4 The two box bodies 110 of the junction box 100 are in a mirror-image structure. In order to be able to test the probes 120 of the two box bodies 110 respectively, two groups of limiting groove groups 11 are provided on the base 1. The two limiting grooves 111 of the same junction box 100 in the two groups of limiting groove groups 11 are in a mirror-image shape, so that the two groups of limiting groove groups 11 can respectively accommodate the two box bodies 110 of the junction box 100, and test the two box bodies 110 of the junction box 100 in turn.

[0047] In this embodiment, four limiting grooves 111 are arranged on the base 1, and the four limiting grooves 111 are arranged in a square, and two diagonal limiting grooves 111 form a limiting groove group 11. After the box body 110 to be tested is placed in the corresponding limiting groove 111, the cables 130 of the two junction boxes 100 are in a parallel state, and such an arrangement makes it more convenient to arrange the junction box 100 on the base 1.

[0048] Furthermore, if Figure 3 and Figure 4 As shown, the base 1 is also provided with an avoidance groove 13, one end of the avoidance groove 13 is connected to the limiting groove 111, and the other end of the avoidance groove 13 is connected to the edge of the base 1. When the box body 110 is placed in the limiting groove 111, the cable 130 of the junction box 100 is limited in the avoidance groove 13. The cable 130 is prevented from interfering with the base 1, so that the box body 110 can be stably placed in the limiting groove 111.

[0049] Specifically, the depth of the connecting groove 12 is greater than the depth of the limiting groove 111, and the connecting groove 12 extends into the limiting groove 111, so that the upper surface of the bus bar 3 is lower than the bottom of the limiting groove 111, thereby providing an extension space for the probe 120, so that the probe 120 extends out of the surface of the box body 110 and contacts the bus bar 3.

[0050] Furthermore, if Fig.10As shown, the pressing assembly 2 includes a support member 21 and a weight 22. The support member 21 is arranged on the base 1, and the weight 22 is slidably arranged on the support member 21, so as to be able to slide downward to press the box body 110 in the limiting groove 111 or slide upward to avoid the limiting groove 111. By sliding the weight 22 upward to avoid the limiting groove 111, it is convenient to take and put the box body 110.

[0051] The weight of the weight 22 can be set to 2KG, which is much larger than the elastic force of the spring inside the probe 120. The weight 22 slides downward under the action of gravity to press against the box body 110, so that the probe 120 and the bus bar 3 can be in contact more fully and firmly.

[0052] Optionally, the support member 21 includes a support column 211 and a rotating link 212, wherein the bottom end of the support column 211 is disposed on the base 1, one end of the rotating link 212 is rotatably connected to the top end of the support column 211, and a weight 22 is slidably disposed on the other end of the rotating link 212. By providing the rotating link 212, the weight 22 can be rotated so that the weight 22 avoids the limiting groove 111 in the horizontal direction, thereby further improving the convenience of taking and placing the box body 110.

[0053] Specifically, the rotating link 212 includes a first link 2121 and a second link 2122, the first link 2121 and the second link 2122 are rotatably connected, the second link 2122 is rotatably connected to the support column 211, and the weight 22 is slidably arranged on the first link 2121. By setting the rotating link 212 as a mode in which the first link 2121 and the second link 2122 are rotatably connected, the weight 22 has a greater degree of freedom of movement, and it is more convenient to adjust the position of the weight 22.

[0054] In this embodiment, combined with Figure 4 As shown, the support column 211 is disposed between each of the two limiting groove groups 11, and specifically, a pressing assembly 2 is disposed in the middle of the left side and the right side of the base 1. By rotating the connecting rod 212, the weight 22 can be rotated to align with each of the limiting grooves 111 in the two limiting groove groups 11, so that by providing two pressing assemblies 2, the box body 110 in the four limiting grooves 111 can be pressed, simplifying the device structure.

[0055] Alternatively, if Fig.10 As shown, the weight 22 includes a pressure head 221 and a slide post 222 connected to each other. The slide post 222 is slidably connected to the rotating connecting rod 212. The slide post 222 can be pulled up to move the pressure head 221 upward and away from the box body 110 in the limiting groove 111. When the weight 22 needs to be rotated, the slide post 222 is pulled upward to drive the pressure head 221 to move upward and away from the box body 110 or the surface of the base 1. After the weight 22 is rotated to the right position, the slide post 222 is released, and the weight 22 will slide down under the action of gravity.

[0056] In order to facilitate the lifting of the sliding column 222, a boss 2221 is provided at one end of the sliding column 222 away from the pressure head 221, and the boss 2221 can be against the support member 21. By providing the boss 2221, on the one hand, it can be used as a lifting handle, and on the other hand, the boss 2221 plays a blocking role, which is conducive to preventing the sliding column 222 from detaching from the rotating connecting rod 212.

[0057] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Junction box contact resistance test device, characterized in that: include: A base (1), wherein a limiting groove group (11) is provided on the base (1), the limiting groove group (11) comprises two limiting grooves (111) arranged at intervals, the box bodies (110) of the two junction boxes (100) can be respectively limited in the two limiting grooves (111), and the base (1) is also provided with a connecting groove (12), the connecting groove (12) is connected to the two limiting grooves (111), and the limiting groove (111) is used to accommodate a bus bar (3) so that the bus bar (3) is connected to the probes (120) of the two junction boxes (100); A pressing component (2) is arranged on the base (1), and the pressing component (2) is used to press the box body (110) so as to press the probe (120) onto the bus bar (3).

2. The junction box contact resistance testing device according to claim 1, characterized in that: The junction box (100) comprises two box bodies (110), the two box bodies (110) are in a mirror-image structure, two groups of limit groove groups (11) are provided on the base (1), and the two limit grooves (111) in the two groups of limit groove groups (11) that accommodate the same junction box (100) are in a mirror-image shape.

3. The junction box contact resistance testing device according to claim 1, characterized in that: The base (1) is also provided with an avoidance groove (13), one end of the avoidance groove (13) is connected to the limiting groove (111), and the other end of the avoidance groove (13) is connected to the edge of the base (1), and when the box body (110) is placed in the limiting groove (111), the cable (130) of the junction box (100) is limited in the avoidance groove (13).

4. The junction box contact resistance testing device according to claim 1, characterized in that: The depth of the connection groove (12) is greater than the depth of the limiting groove (111), and the connection groove (12) extends into the limiting groove (111), so that the upper surface of the bus bar (3) is lower than the bottom of the limiting groove (111).

5. The junction box contact resistance testing device according to any one of claims 1 to 4, characterized in that: The pressing assembly (2) comprises a support member (21) and a weight (22); the support member (21) is arranged on the base (1); and the weight (22) is slidably arranged on the support member (21) so as to be able to slide downward to press the box body (110) in the limiting groove (111) or slide upward to avoid the limiting groove (111).

6. The junction box contact resistance testing device according to claim 5, characterized in that: The support member (21) comprises a support column (211) and a rotating connecting rod (212), wherein the bottom end of the support column (211) is arranged on the base (1), one end of the rotating connecting rod (212) is rotatably connected to the top end of the support column (211), and the other end of the rotating connecting rod (212) is slidably provided with the weight (22).

7. The junction box contact resistance testing device according to claim 6, characterized in that: The rotating connecting rod (212) comprises a first connecting rod (2121) and a second connecting rod (2122), wherein the first connecting rod (2121) and the second connecting rod (2122) are rotatably connected, the second connecting rod (2122) is rotatably connected to the supporting column (211), and the weight (22) is slidably arranged on the first connecting rod (2121).

8. The junction box contact resistance testing device according to claim 6, characterized in that: The limiting groove groups (11) are provided with two groups, the support column (211) is provided between each of the limiting grooves (111) in the two groups of limiting groove groups (11), and the rotation of the rotating connecting rod (212) can cause the weight (22) to rotate so as to align with each of the limiting grooves (111) in the two groups of limiting groove groups (11).

9. The junction box contact resistance testing device according to claim 5, characterized in that: The weight (22) comprises a pressure head (221) and a sliding column (222) connected to each other. The sliding column (222) is slidably connected to the support member (21). Pulling the sliding column (222) can cause the pressure head (221) to move upward and escape from the box body (110) in the limiting groove (111).

10. The junction box contact resistance testing device according to claim 9, characterized in that: A boss (2221) is provided at one end of the sliding column (222) away from the pressure head (221), and the boss (2221) can abut against the support member (21).

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