Slotting flow divider

Abstract

A slotted shunt comprises a rectangular manganese copper plate, red copper plates are welded to the left side and the right side of the manganese copper plate, wiring holes which penetrate through the red copper plates in the vertical direction and are used for accessing current are symmetrically formed in the positions, away from the manganese copper plate in the left-right direction, of the two red copper plates, and sampling units are symmetrically arranged in the positions, close to the manganese copper plate in the left-right direction, of the two red copper plates. Through grooves penetrating through the red copper plates in the vertical direction are formed in the positions, corresponding to the sampling units, of the two red copper plates, the vertical projection of each through groove is in a curve shape bent in one direction, and the concave side of the bent shape of each through groove is right opposite to the corresponding sampling unit. The projection position relation of the through grooves in the two red copper plates in the vertical direction meets the conditions that the through grooves are in central symmetry along the horizontal center point of the manganese-copper plate and are asymmetric along the center line in the left-right direction of the manganese-copper plate. Through the special slotting design, the resistance temperature coefficient of the shunt is greatly reduced, and the precision is improved.

Description

Technical Field

[0001] The utility model relates to a grooved shunt. Background Art

[0002] A shunt is an essential component in intelligent circuit breakers, power supplies, disconnectors, and test instruments. For its mechanical structure, refer to Chinese Patent CN208270633U. Generally, a manganese copper plate is used as the resistance material, and copper plates are welded on both sides of the manganese copper plate for current access, and sampling is carried out near the manganese copper plate.

[0003] The temperature coefficient of resistance (TCR) is an important indicator of the shunt. The smaller the TCR of the shunt, the greater its accuracy. However, restricted by existing material technologies and manufacturing processes, it is very difficult to further reduce the TCR of the shunt. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a grooved shunt, which significantly reduces the temperature coefficient of resistance of the shunt and improves the accuracy through a special grooving design.

[0005] To solve the above technical problem, the utility model provides a grooved shunt, which includes a rectangular manganese copper plate arranged horizontally. Rectangular copper plates are symmetrically welded on both the left and right sides of the manganese copper plate and are horizontally arranged. The two copper plates have the same size and are flush with the front and back sides of the manganese copper plate. Along the left - right direction away from the manganese copper plate, symmetrically arranged through - holes for current access that penetrate the copper plates vertically are provided on both copper plates. Along the left - right direction close to the manganese copper plate, sampling units are symmetrically arranged on both copper plates. Through - slots that penetrate the copper plates vertically are provided at positions corresponding to the sampling units on the two copper plates. The projection of the through - slot in the vertical direction is in the shape of a curve bent in one direction. The concave side of the bent shape of the through - slot faces the corresponding sampling unit. The projection positions of the through - slots on the two copper plates in the vertical direction simultaneously satisfy: being centrosymmetric about the horizontal center point of the manganese copper plate and being asymmetric about the left - right center line of the manganese copper plate.

[0006] Preferably, the projection of the through - slot in the vertical direction is in the shape of an L. The L shape includes a long horizontal side and a vertical side. The length direction of the horizontal side of the L shape is left - right, and the length direction of the vertical side of the L shape is front - back.

[0007] Preferably, the sampling unit is a threaded hole that penetrates the corresponding copper plate vertically.

[0008] Preferably, the sampling unit includes a first through - hole that penetrates the corresponding copper plate vertically. A rivet is press - riveted in the first through - hole, and the tip of the rivet extends vertically upward to form a terminal.

[0009] Preferably, the sampling unit comprises vertically arranged wiring pins, a horizontally arranged welding base is provided at the lower side of the wiring pins, and the wiring pins are connected to the corresponding copper plate via the welding base.

[0010] Preferably, the sampling unit comprises a second through hole penetrating the corresponding copper plate in the vertical direction, and a rivet nut fixed in the second through hole is provided at the upper side of the manganese copper plate corresponding to the second through hole.

[0011] The utility model has the advantages that by slotting near the copper plate sampling unit, the entire shunt obtains an extremely low resistance temperature coefficient, which greatly improves its accuracy. In addition, due to the presence of the slots, the heat exchange area between the entire shunt and the air is increased, and excellent heat dissipation is also provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a top view of the first embodiment of the present utility model.

[0013] Figure 2 It is a top view of the second embodiment of the utility model.

[0014] Figure 3 It is the front view of the second embodiment of the present utility model.

[0015] Figure 4 It is a top view of the third embodiment of the present utility model.

[0016] Figure 5 It is the front view of the third embodiment of the present utility model.

[0017] Figure 6 It is a three-dimensional diagram of the fourth embodiment of the present utility model.

[0018] Figure 7 It is the engineering drawing of experimental group 1.

[0019] Figure 8 It is the engineering drawing of experimental group 2.

[0020] Figure 9 It is the engineering drawing of experimental group 3.

[0021] Figure 10 It is the engineering drawing of experimental group 4.

[0022] Figure 11 It is the engineering drawing of the control group. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] See also Figure 1, A slotted shunt, comprising a rectangular manganese copper plate 1 arranged horizontally. Rectangular copper plates 2 arranged horizontally are symmetrically welded to both the left and right sides of the manganese copper plate 1. The two copper plates 2 are of the same size and are flush with the front and rear sides of the manganese copper plate 1. Along the left - right direction away from the manganese copper plate 1, symmetrically arranged on both copper plates 2 are wiring holes 3 that penetrate the copper plates 2 vertically for connecting current. Along the left - right direction close to the manganese copper plate 1, symmetrically arranged on both copper plates 2 are threaded holes 5 that penetrate the corresponding copper plates 2 vertically. At the positions of the two copper plates 2 corresponding to the sampling unit, through - slots 4 that penetrate the copper plates 2 vertically are provided. The vertical projection of the through - slot 4 is L - shaped. The L - shape includes a long - strip - shaped horizontal side and a vertical side. The length direction of the horizontal side of the L - shape is left - right, and the length direction of the vertical side of the L - shape is front - rear. The concave side of the L - shape of the through - slot 4 faces the corresponding sampling unit. The vertical projections of the through - slots 4 on the two copper plates 2 are centrosymmetric about the horizontal center point of the manganese copper plate 1 and are not symmetric about the center line of the manganese copper plate 1 in the left - right direction.

[0025] Embodiment Two:

[0026] See Figure 2 、 Figure 3 , A slotted shunt, comprising a rectangular manganese copper plate 1 arranged horizontally. Rectangular copper plates 2 arranged horizontally are symmetrically welded to both the left and right sides of the manganese copper plate 1. The two copper plates 2 are of the same size and are flush with the front and rear sides of the manganese copper plate 1. Along the left - right direction away from the manganese copper plate 1, symmetrically arranged on both copper plates 2 are wiring holes 3 that penetrate the copper plates 2 vertically for connecting current. Along the left - right direction close to the manganese copper plate 1, symmetrically arranged on both copper plates 2 are first through - holes 6 that penetrate the corresponding copper plates 2 vertically. In the first through - hole 6, a rivet 61 that is press - riveted to the first through - hole 6 is provided. The tip of the rivet 61 extends vertically upward to form a wiring post. At the positions of the two copper plates 2 corresponding to the sampling unit, through - slots 4 that penetrate the copper plates 2 vertically are provided. The vertical projection of the through - slot 4 is L - shaped. The L - shape includes a long - strip - shaped horizontal side and a vertical side. The length direction of the horizontal side of the L - shape is left - right, and the length direction of the vertical side of the L - shape is front - rear. The concave side of the L - shape of the through - slot 4 faces the corresponding sampling unit. The vertical projections of the through - slots 4 on the two copper plates 2 are centrosymmetric about the horizontal center point of the manganese copper plate 1 and are not symmetric about the center line of the manganese copper plate 1 in the left - right direction.

[0027] Embodiment Three:

[0028] See Figure 4 、 Figure 5, A slotted shunt, including a horizontally arranged rectangular manganese copper plate 1, horizontally arranged rectangular copper plates 2 are symmetrically welded to both the left and right sides of the manganese copper plate 1. The two copper plates 2 are of the same size and are flush with the front and back sides of the manganese copper plate 1. Along the left - right direction away from the manganese copper plate 1, symmetrically arranged wiring holes 3 for accessing current and vertically penetrating the copper plates 2 are provided on both the two copper plates 2. Along the left - right direction close to the manganese copper plate 1, symmetrically arranged wiring pins 7 vertically penetrating the corresponding copper plates 2 are provided on both the two copper plates 2. A horizontally arranged welding base 71 is provided below the wiring pins 7, and the wiring pins 7 are connected to the corresponding copper plates 2 through the welding bases 71. At the positions of the two copper plates 2 corresponding to the sampling units, through - slots 4 vertically penetrating the copper plates 2 are provided. The vertical projection of the through - slot 4 is in an L - shape. The L - shape includes a long - strip - shaped horizontal side and a vertical side. The length direction of the horizontal side of the L - shape is left - right, and the length direction of the vertical side of the L - shape is front - back. The concave side of the L - shape of the through - slot 4 faces the corresponding sampling unit. The vertical projections of the through - slots 4 on the two copper plates 2 are centrosymmetric about the horizontal center point of the manganese copper plate 1 and are not symmetric about the center line of the manganese copper plate 1 in the left - right direction.

[0029] Embodiment 4:

[0030] See Figure 6 , A slotted shunt, including a horizontally arranged rectangular manganese copper plate 1, horizontally arranged rectangular copper plates 2 are symmetrically welded to both the left and right sides of the manganese copper plate 1. The two copper plates 2 are of the same size and are flush with the front and back sides of the manganese copper plate 1. Along the left - right direction away from the manganese copper plate 1, symmetrically arranged wiring holes 3 for accessing current and vertically penetrating the copper plates 2 are provided on both the two copper plates 2. Along the left - right direction close to the manganese copper plate 1, second through - holes 8 vertically penetrating the corresponding copper plates 2 are symmetrically provided on both the two copper plates 2. At the position on the upper side of the manganese copper plate 1 corresponding to the second through - holes 8, press - riveted nuts 81 fixed in the second through - holes 8 are provided. At the positions of the two copper plates 2 corresponding to the sampling units, through - slots 4 vertically penetrating the copper plates 2 are provided. The vertical projection of the through - slot 4 is in an L - shape. The L - shape includes a long - strip - shaped horizontal side and a vertical side. The length direction of the horizontal side of the L - shape is left - right, and the length direction of the vertical side of the L - shape is front - back. The concave side of the L - shape of the through - slot 4 faces the corresponding sampling unit. The vertical projections of the through - slots 4 on the two copper plates 2 are centrosymmetric about the horizontal center point of the manganese copper plate 1 and are not symmetric about the center line of the manganese copper plate 1 in the left - right direction.

[0031] Using press - riveted nuts can make the sampling point infinitely close to the junction of the manganese copper plate and the copper plate, thus obtaining a smaller temperature drift performance. During sampling, the conductive joint only contacts the upper side of the press - riveted nut. Since the upper side of the press - riveted nut protrudes from the copper plate and the upper side height of the manganese copper plate is lower than the upper side height of the copper plate, in this way, during sampling, the exposed part of the wire and the conductive joint at the end of the wire will not contact the manganese copper plate;

[0032] The swage nut is generally made of stainless steel. Compared with red copper, it has higher hardness, longer thread life, is not prone to thread slipping, and extends the service life of the shunt.

[0033] During sampling, the conductive joint only contacts the upper side of the swage nut. Since the area of the upper side of the swage nut is fixed, when conductive joints of different shapes and sizes contact the upper side of the swage nut, the actual contact area is always constant (the conductive joint generally completely covers the swage nut during use). This can ensure that the measured resistance value during actual use by the user is highly consistent with the test result when the shunt leaves the factory.

[0034] To prove that the grooving method provided in this application can indeed significantly reduce the resistance temperature coefficient of the shunt and improve the accuracy, the following comparative experiments are given:

[0035] Test environment: The indoor temperature for the temperature test environment is 24.7°C - 24.8°C, and the humidity is 35% - 38%.

[0036] Experimental groups:

[0037] Experimental group 1, see Figure 7 , the structure adopts the conventional horizontal shunt structure. Manganese copper plates are used as the resistance material. Copper plates are welded on both sides of the manganese copper plate for current access. On both sides of the two copper plates away from the manganese copper plate in the left - right direction, there are symmetrically arranged wiring holes penetrating the copper plates vertically. On both sides of the two copper plates close to the manganese copper plate in the left - right direction, there are symmetrically arranged through - holes penetrating the corresponding copper plates vertically. At the position corresponding to the through - holes on the upper side of the manganese copper plate, there are swage nuts fixed in the through - holes, serving as the sampling unit. At the positions corresponding to the sampling unit on the two copper plates, there are through - slots penetrating the copper plates vertically. The shapes of the through - slots on the two copper plates are U - shaped, symmetric about the left - right direction and with the openings facing each other. For specific parameters, see the drawing markings.

[0038] Experimental group 2, see Figure 8, the structure adopts a conventional horizontal shunt structure, uses a manganese copper plate as the resistance material, welds copper plates on both sides of the manganese copper plate for connecting current. On both sides of the manganese copper plate, symmetrically arranged wire holes vertically penetrating the copper plates are provided at positions far from the manganese copper plate in the left-right direction. On both sides of the manganese copper plate, symmetrically arranged through holes vertically penetrating the corresponding copper plates are provided at positions close to the manganese copper plate in the left-right direction. At the positions corresponding to the through holes on the upper side of the manganese copper plate, rivet nuts fixed in the through holes are provided. As the sampling unit, at the positions corresponding to the sampling unit on both copper plates, through grooves vertically penetrating the copper plates are provided. The shapes of the through grooves on the two copper plates are such that the projection of the through groove described in this application along the vertical direction is an L shape. The L shape includes a long horizontal side and a vertical side. The length direction of the horizontal side of the L shape is in the left-right direction, and the length direction of the vertical side of the L shape is in the front-back direction. The concave side of the L shape of the through groove faces the corresponding sampling unit. The projections of the through grooves on the two copper plates along the vertical direction are centrosymmetric about the horizontal center point of the manganese copper plate and are not symmetric about the center line of the manganese copper plate in the left-right direction. Specific parameters are shown in the drawing marks.

[0039] Experimental group 3, see Figure 9 , the structure adopts a conventional horizontal shunt structure, uses a manganese copper plate as the resistance material, welds copper plates on both sides of the manganese copper plate for connecting current. On both sides of the manganese copper plate, symmetrically arranged wire holes vertically penetrating the copper plates are provided at positions far from the manganese copper plate in the left-right direction. On both sides of the manganese copper plate, symmetrically arranged through holes vertically penetrating the corresponding copper plates are provided at positions close to the manganese copper plate in the left-right direction. At the positions corresponding to the through holes on the upper side of the manganese copper plate, rivet nuts fixed in the through holes are provided. As the sampling unit, at the positions corresponding to the sampling unit on both copper plates, through grooves vertically penetrating the copper plates are provided. The shapes of the through grooves on the two copper plates are long strips symmetrically arranged in the front-back direction in the left-right direction. Specific parameters are shown in the drawing marks.

[0040] Experimental group 4, see Figure 10 , the structure adopts a conventional horizontal shunt structure, uses a manganese copper plate as the resistance material, welds copper plates on both sides of the manganese copper plate for connecting current. On both sides of the manganese copper plate, symmetrically arranged wire holes vertically penetrating the copper plates are provided at positions far from the manganese copper plate in the left-right direction. On both sides of the manganese copper plate, symmetrically arranged through holes vertically penetrating the corresponding copper plates are provided at positions close to the manganese copper plate in the left-right direction. At the positions corresponding to the through holes on the upper side of the manganese copper plate, rivet nuts fixed in the through holes are provided. As the sampling unit, at the positions corresponding to the sampling unit on both copper plates, two through grooves vertically penetrating the copper plates are respectively provided. The shapes of the through grooves are long strips in the left-right direction. The two through grooves on each copper plate are symmetrically distributed before and after the rivet nut, and the through grooves on the two copper plates are arranged symmetrically in the left-right direction. Specific parameters are shown in the drawing marks.

[0041] Control group, see Figure 11, the structure adopts a conventional horizontal shunt structure, with a manganese copper plate as the resistance material. Copper plates are welded on both sides of the manganese copper plate for current access. On both sides of the two copper plates away from the manganese copper plate in the left-right direction, there are symmetrically arranged wiring holes vertically penetrating the copper plates. On both sides of the two copper plates close to the manganese copper plate in the left-right direction, there are symmetrically arranged through holes vertically penetrating the corresponding copper plates. At the position above the manganese copper plate corresponding to the through holes, there are press riveting nuts fixed in the through holes. As the sampling unit, the two copper plates have no slots, and the specific parameters are shown in the drawing marks.

[0042] For the above experimental group and control group, the shunt body structure and the sampling unit are the same, only the presence or absence of slots and the slotting methods are different. Next, TCR tests are carried out on the four experimental groups and one control group respectively. The test process: 1. Place the product to be tested in a high and low temperature chamber, and adjust the temperature from 20°C to 60°C, at intervals of 10°C; 2. Record the values and calculate the TCR value based on 20°C as the reference.

[0043] The test equipment is shown in the following table:

[0044] Equipment Manufacturer Model High and Low Temperature Chamber ESPEC MC-810P DC Standard Resistance Shanghai Electric Meter Factory 7363 High Power DC Current Stabilized Source Decai Power MTY152000 DC Digital Voltmeter Keysight Technologies 34465A

[0045] For Experimental Group 1, the TCR test results are shown in Table 1:

[0046] Table 1

[0047] Serial Number Experimental Temperature (°C) Measured Resistance (mΩ) TCR ppm Accuracy (%) 1 20 0.150160 0.0000 0.1067 2 30 0.150102 -38.6255 0.0680 3 40 0.150066 -31.2999 0.0440 4 50 0.150028 -29.3021 0.0187 5 60 0.149956 -33.9638 -0.0293

[0048] For Experimental Group 2, the TCR test results are shown in Table 2:

[0049] Table 2

[0050] Serial Number Experimental Temperature (°C) Measured Resistance (mΩ) TCR ppm Accuracy (%) 1 20 0.149907 0.0000 -0.0620 2 30 0.149897 -6.6708 -0.0687 3 40 0.149935 9.3391 -0.0433 4 50 0.149942 7.7826 -0.0387 5 60 0.149940 5.5034 -0.0400

[0051] For Experimental Group 3, the TCR test results are shown in Table 3:

[0052] Table 3

[0053] Serial Number Experimental Temperature (°C) Measured Resistance (mΩ) TCR ppm Accuracy (%) 1 20 0.150160 0.0000 0.1067 2 30 0.150102 -38.6255 0.0680 3 40 0.150066 -31.2999 0.0440 4 50 0.150028 -29.3021 0.0187 5 60 0.149956 -33.9638 -0.0293

[0054] For Experimental Group 4, the TCR test results are shown in Table 4:

[0055] Table 4

[0056] Serial Number Experimental Temperature (°C) Measured Resistance (mΩ) TCR ppm Accuracy (%) 1 20 0.149990 0.0000 -0.0067 2 30 0.150070 53.3369 0.0467 3 40 0.150136 48.6699 0.0907 4 50 0.150167 39.3360 0.1113 5 60 0.150170 30.0020 0.1133

[0057] For the control group, the TCR test results are shown in Table 5:

[0058] Table 5

[0059] Serial Number Experimental Temperature (°C) Measured Resistance (mΩ) TCR ppm Accuracy (%) 1 20 0.149740 0.0000 -0.1733 2 30 0.149831 60.7720 -0.1127 3 40 0.149880 46.7477 -0.0800 4 50 0.149902 36.0625 -0.0653 5 60 0.149930 31.7217 -0.0467

[0060] From the above experimental data, it can be seen that the resistance value of experimental group 2 changes the least with temperature. The grooving method provided by this application can indeed greatly reduce the temperature coefficient of resistance of the shunt and improve the accuracy.

Claims

1. A slotted current divider, comprising a horizontally arranged rectangular manganese copper plate, with horizontally arranged rectangular copper plates symmetrically welded on both sides of the manganese copper plate, the two copper plates having the same size and being flush with the front and rear sides of the manganese copper plate, the two copper plates being symmetrically provided with wiring holes for current access in the vertical direction penetrating the copper plates at the left and right sides away from the manganese copper plates, and the two copper plates being symmetrically provided with sampling units at the left and right sides close to the manganese copper plates, characterized in that: The two copper plates are provided with through grooves penetrating the copper plates in the vertical direction at the positions corresponding to the sampling units. The projection of the through grooves in the vertical direction is in the shape of a curve bent in one direction. The concave side of the bent shape of the through grooves is opposite to the corresponding sampling unit. The projection position relationship of the through grooves on the two copper plates in the vertical direction satisfies the following conditions at the same time: they are centrally symmetrical along the horizontal center point of the manganese copper plate, and they are asymmetrical along the left-right center line of the manganese copper plate.

2. A slotted diverter according to claim 1, characterized in that: The projection of the through groove in the vertical direction is L-shaped, and the L-shape includes a long horizontal side and a vertical side. The length direction of the horizontal side of the L-shape is left-right, and the length direction of the vertical side of the L-shape is front-back.

3. A slotted diverter according to claim 1, characterized in that: The sampling unit is a threaded hole that vertically penetrates the corresponding copper plate.

4. A slotted diverter according to claim 1, characterized in that: The sampling unit comprises a first through hole penetrating the corresponding copper plate in the vertical direction, a rivet connected to the first through hole by riveting is arranged in the first through hole, and the tip of the rivet extends vertically upward to form a terminal.

5. The slotted diverter according to claim 1, characterized in that: The sampling unit comprises vertically arranged wiring pins, a horizontally arranged welding base is provided at the lower side of the wiring pins, and the wiring pins are connected to the corresponding copper plate through the welding base.

6. A slotted flow divider according to claim 1, characterized in that: The sampling unit comprises a second through hole penetrating the corresponding copper plate in the vertical direction, and a rivet nut fixed in the second through hole is provided at the upper position of the manganese copper plate corresponding to the second through hole.

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