Measurable electromagnetic relay and its electronic watt-hour meter

Abstract

A measurable electromagnetic relay including a housing (1), a PCB board (2), and two lead sheets (33, 34) extending from within the housing (1) to the outside of a first side of the housing (1) and connected to a contact assembly within the housing (1), one of the two lead sheets (33, 34), a lead sheet (33), includes a plate-shaped sampling resistive sheet (4) made of a material with high resistivity and a conductive sheet (6) connected to both ends of the sampling resistive sheet (4), and in the lead sheet (33), at the positions of both ends of the sampling resistive sheet (4), a conductive sheet (6) is connected to the both ends of the sampling resistive sheet (4) for realizing the inflow and outflow of current. The sampling resistance sheet (4) has two sampling pins (41) extending in the same direction, and the two sampling pins (41) are inserted into the PCB board (2) and connected by welding, and the sampling resistance sheet (4) has through holes (42) formed along the thickness direction of the plate body, so that a first sealing ring (S1) formed by the through holes (42) cancels out the induced current generated by the external alternating magnetic field in the sampling resistance sheet (4), the sampling pins (41) and the PCB board (2), thereby improving the anti-interference ability when the relay makes measurements in an alternating magnetic field. An electronic watt-hour meter including the above electromagnetic relay is further provided.

Description

[Technical field]

[0001] The present invention claims priority to Chinese patent application having application number 202111659685.7, filed on December 30, 2021, and Chinese patent application having application number 202123430937.7, the entire disclosures of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of electronic meters, and in particular to a measurable electromagnetic relay and its electronic watt-hour meter. [Background technology]

[0003] An electronic watt-hour meter is an electronic meter device that samples the voltage and current supplied to the user in real time, and then uses an integrated circuit dedicated to the watt-hour meter to process the sampled voltage and current signals and convert them into a pulse output proportional to the electrical energy, which is then displayed by a resistor or a digital display. In an electronic watt-hour meter, a load circuit is usually controlled by a relay, and a relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and is usually used in an automatic control circuit, and is actually an "automatic switch" that controls a large current with a small current, and plays the role of automatic adjustment, safety protection, conversion circuit, etc. in the circuit. A measurable electromagnetic relay used in an electronic watt-hour meter according to the prior art usually includes a housing, a contact assembly in the housing, and two lead-out sheets connected to the contact assembly in the housing. One of the two lead-out sheets is provided with a manganese copper piece as a measuring device, and the manganese copper piece is provided with a sampling pin and connected to a PCB board via a signal line. Since such a relay is connected by a signal line, a welding process is required, which has disadvantages such as a complex process, high manufacturing cost, and low degree of automation, and also reduces the measurement accuracy due to interference from an external magnetic field.

[0004] In addition, the measurable electromagnetic relay used in the electronic watt-hour meter according to the prior art performs measurement in two paths, and such a two-path measurement relay is provided with four lead-out sheets, and each of the two lead-out sheets forms one path, and the contact assemblies in the corresponding one path are connected to each other, and in the lead-out sheets in the two paths, one of the two lead-out sheets in each path is provided with a measurement device, and one of the lead-out sheets in one of the paths is provided with a manganese copper piece for measurement as a sampling circuit, and one of the lead-out sheets in the other path is equipped with a current transformer for measurement as a sampling circuit, and such a two-path measurement relay with measurement mode in the prior art mainly has the following disadvantages: First, the measurement in one of the paths uses a current transformer, which increases the cost of the relay and affects the competitiveness of the product. Secondly, the manganese copper pieces and the current transformer are both connected by signal lines, and the coil leads are also connected by signal lines, which makes the production process complicated, increases the number of signal lines, makes it easy for welding errors to occur, and results in high labor costs and low automation. Summary of the Invention

[0005] The objective of the present invention is to overcome the shortcomings of the prior art and provide a measurable electromagnetic relay and its electronic watt-hour meter, which, through structural improvements, can improve the anti-interference ability when the relay measures in an alternating magnetic field, while avoiding many of the disadvantages caused by connection through signal lines, and has the characteristics of low manufacturing cost, easy installation, and high degree of automation.

[0006] The technical solution used in the present invention to solve the technical problem is as follows: a measurable electromagnetic relay including a housing, a PCB board, and two lead sheets extending from inside the housing to the outside of a first side of the housing and connected to a contact assembly in the housing, one of the two lead sheets includes a plate-shaped sampling resistor sheet made of a material with high resistivity and a conductive sheet connected to both ends of the sampling resistor sheet, two sampling pins extending in the same direction are provided at both ends of the sampling resistor sheet to realize current inflow and outflow, the sampling pins of the two sampling resistor sheets are inserted into the PCB board respectively and connected by welding, the sampling resistor sheet is provided with a through hole along the thickness direction of the plate, so that a first sealing ring formed by the through hole can cancel out the induced current generated by the external alternating magnetic field, and a second sealing ring surrounded by the sampling resistor sheet, the sampling pins and the PCB board can cancel out the induced current generated by the external alternating magnetic field, thereby improving the anti-interference ability of the relay when measuring in an alternating magnetic field.

[0007] The area of ​​the first sealing ring is the same as that of the second sealing ring, and the first sealing ring formed by the through holes completely cancels out the induced current generated by the external alternating magnetic field, while the second sealing ring surrounded by the sampling resistive sheet, the sampling pins, and the PCB board completely cancels out the induced current generated by the external alternating magnetic field.

[0008] There are two lead-out sheets extending from within the housing to the outside of a first side of the housing and connected to a contact assembly within the housing, the contact assembly within the housing is one path, and one of the two lead-out sheets includes the sampling resistive sheet.

[0009] There are four lead-out sheets extending from within the housing to the outside of the first side of the housing and connected to the contact assemblies within the housing, and the contact assemblies within the housing have two paths, and two of the four lead-out sheets are connected to the contact assemblies in a corresponding path, and each lead-out sheet in each path has one lead-out sheet that includes the sampling resistor sheet.

[0010] The sampling pins are inserted into the PCB board on the same plane and connected by welding.

[0011] The housing is further provided with a coil pin extending from within the housing, and the coil pin and the sampling pin are respectively inserted into the PCB board on the same plane and connected by welding.

[0012] The two sampling pins on the same extraction sheet are each connected to the upper surface of a corresponding sampling resistive sheet.

[0013] The two sampling pins on the same extraction sheet are each connected to the upper surface of the corresponding conductive sheet.

[0014] The sampling pins are each provided as a pin-type structure.

[0015] A first boss is further provided on the sampling pin at a connection point with the corresponding sampling resistive sheet, and the cross section of the first boss is larger than the cross section of the sampling pin, and the PCB board is hung on the upper surface of the first boss.

[0016] In the sampling pin, an outer surface corresponding to a portion of the upper surface of the first boss is further coated with a solder layer.

[0017] The through hole of the sampling resistive sheet is located on a vertical line passing through the midpoint of the connection line between the two sampling pins.

[0018] The coil pins are distributed on an upper surface of the housing near a second side of the housing opposite to the first side of the housing, and a second boss is further provided on each of both sides of the upper surface of the housing near the second side of the housing, and the height position of the upper surface of the second boss is flush with the height position of the upper surface of the first boss, and the PCB board is hung on the upper surface of the first boss and the upper surface of the second boss.

[0019] The four pull-out sheets are arranged in sequence along the first side of the housing, with the two intermediate pull-out sheets each being connected to a contact assembly in one path within the housing by one edge of the first side of the housing, and one of the two pull-out sheets located on both sides making a detour from the bottom of the housing to a point approaching the other pull-out sheet, and then being connected to a contact assembly in another path within the housing by the other edge of the first side of the housing.

[0020] The sampling resistive sheet is a manganese copper piece or a constantan piece.

[0021] An electronic energy meter includes an electromagnetic relay capable of measuring such as that described above.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the sampling resistive sheet is provided with a through hole along the thickness direction of the plate, and the first sealing ring formed by the through hole cancels the induced current generated by the external alternating magnetic field, and the second sealing ring surrounded by the sampling resistive sheet, the sampling pin, and the PCB board cancels the induced current generated by the external alternating magnetic field, thereby improving the interference prevention ability when the relay measures in an alternating magnetic field. This structure of the present invention reduces the influence of the alternating electromagnetic field interfering with the accuracy of measurement with manganese copper, and improves the interference prevention ability when the relay measures in an alternating magnetic field, by allowing the through hole of the sampling resistive sheet to cancel the induced current generated by the external alternating magnetic field and allowing the second sealing ring surrounded by the sampling resistive sheet, the sampling pin, and the PCB board to cancel the induced current generated by the external alternating magnetic field.

[0023] Furthermore, the present invention provides a structure in which the contact assemblies in a corresponding path are connected to two of the four lead sheets, and each lead sheet in each path includes a plate-shaped sampling resistor sheet made of a material with high resistivity and a conductive sheet connected to both ends of the sampling resistor sheet. According to this structure of the present invention, the two lead sheets for implementing sampling each use a sampling resistor sheet, and the sampling pins of the two sampling resistor sheets are inserted into the PCB board and connected by welding. This structure of the present invention uses the sampling resistor sheets in the two paths as a sampling circuit for measurement, and the sampling resistor sheets in the two paths are installed so that the sampling pins in the same direction are directly inserted into the PCB board and fixed by welding, thereby avoiding many of the disadvantages caused by the connection by the signal line in the prior art, and has the characteristics of low manufacturing cost, easy installation, and high degree of automation.

[0024] The present invention will be described in more detail below with reference to the drawings and examples, but the measurable electromagnetic relay and its electronic watt-hour meter of the present invention are not limited to the examples. [Brief description of the drawings]

[0025] [Figure 1] 1 is a schematic diagram of a three-dimensional structure of a measurable electromagnetic relay according to a first embodiment of the present invention; [Diagram 2] FIG. 1 is a front view of a measurable electromagnetic relay according to a first embodiment of the present invention. [Diagram 3] FIG. 2 is a top view of the electromagnetic relay capable of measurement according to the first embodiment of the present invention. [Figure 4] FIG. 2 is a left side view of the measurable electromagnetic relay according to the first embodiment of the present invention. [Diagram 5] FIG. 2 is a right side view of the measurable electromagnetic relay according to the first embodiment of the present invention. [Figure 6] FIG. 3 is an enlarged schematic view of a portion A in FIG. [Figure 7] FIG. 2 is a schematic diagram of the three-dimensional structure of the measurable electromagnetic relay (without a PCB board attached) according to the first embodiment of the present invention. [Figure 8] FIG. 1 is a front view of a scalable electromagnetic relay (without a PCB board attached) according to a first embodiment of the present invention. [Figure 9] FIG. 2 is a top view of the scalable electromagnetic relay (without a PCB board attached) according to the first embodiment of the present invention. [Figure 10] FIG. 2 is a left side view of the scalable electromagnetic relay (without a PCB board attached) according to the first embodiment of the present invention. [Figure 11] FIG. 2 is a right side view of the scalable electromagnetic relay (without a PCB board attached) according to the first embodiment of the present invention. [Figure 12] FIG. 2 is a schematic diagram of the three-dimensional structure of one lead sheet in the measurable electromagnetic relay according to the first embodiment of the present invention. [Figure 13] FIG. 2 is a front view of one lead sheet in the measurable electromagnetic relay according to the first embodiment of the present invention. [Figure 14] FIG. 11 is a schematic diagram of a three-dimensional structure of a measurable electromagnetic relay (without a PCB board attached) according to a second embodiment of the present invention. [Figure 15] FIG. 11 is a front view of a scalable electromagnetic relay (without a PCB board attached) according to a second embodiment of the present invention. [Figure 16] FIG. 11 is a top view of a scalable electromagnetic relay (without a PCB board attached) according to a second embodiment of the present invention. [Figure 17] FIG. 11 is a rear view of a scalable electromagnetic relay (without a PCB board attached) according to a second embodiment of the present invention. [Figure 18] FIG. 11 is a schematic diagram of the three-dimensional structure of a measurable electromagnetic relay (without a PCB board attached and rotated by one angle) according to a second embodiment of the present invention; [Figure 19] 11 is a schematic diagram of a three-dimensional structure of a dual-path measurement relay according to a third embodiment of the present invention. FIG. [Figure 20] FIG. 11 is a front view of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 21] FIG. 11 is a top view of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 22] FIG. 11 is a left side view of a dual-path measurement relay according to a third embodiment of the present invention. [Diagram 23] FIG. 11 is a right side view of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 24] FIG. 11 is a schematic diagram of a three-dimensional structure of a double-path measurement relay (without a PCB board attached) according to a third embodiment of the present invention. [Diagram 25] FIG. 11 is a front view of a double-path measurement relay (without a PCB board attached) according to a third embodiment of the present invention. [Figure 26] FIG. 11 is a top view of a dual-path measurement relay (without a PCB board attached) according to a third embodiment of the present invention. [Figure 27] FIG. 11 is a left side view of a double-path measurement relay (without a PCB board attached) according to a third embodiment of the present invention. [Figure 28]FIG. 11 is a right side view of a double-path measurement relay (without a PCB board attached) according to a third embodiment of the present invention. [Figure 29] 13 is a schematic diagram of the three-dimensional structure of one lead-out sheet in a double-path measurement relay according to Example 3 of the present invention. FIG. [Diagram 30] FIG. 11 is a front view of one lead-out sheet in a double-path measurement relay according to Example 3 of the present invention. [Diagram 31] FIG. 11 is a front view of a dual-path measurement relay according to a fourth embodiment of the present invention. [Diagram 32] FIG. 32 is an enlarged schematic view of a portion B in FIG. 31. [Diagram 33] FIG. 11 is a schematic diagram of a three-dimensional structure of a double-path measurement relay (without a PCB board attached) according to a fourth embodiment of the present invention. [Diagram 34] 13 is a schematic diagram of the three-dimensional structure of one lead-out sheet in a dual-path measurement relay according to Example 4 of the present invention. FIG. [Diagram 35] FIG. 11 is a front view of one lead-out sheet in a double-path measurement relay according to Example 4 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Next, exemplary embodiments will be described more fully with reference to the drawings. However, the exemplary embodiments can be implemented in a variety of forms and should not be understood as being limited to the embodiments described herein. In this specification, relative terms such as "above" and "below" are used to describe the relative relationship between one assembly and another assembly shown in the drawings, but these terms are used here for convenience only and are based on the exemplary direction shown in the drawings, for example. If the device shown in the drawings is inverted so that its top and bottom are reversed, it can be understood that the assembly located "above" becomes the assembly located "below". Other relative terms such as "top" and "bottom" have similar meanings. When a structure is located "above" another structure, it can mean that the structure is integrally formed on the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure by another structure.

[0027] The terms "a", "one", "the", and "said" are used to indicate the presence of one or more elements / components / etc., the terms "comprise" and "having" are used to mean an open inclusion and refer to elements / components / etc. that may be present in addition to the listed elements / components / etc., and the terms "first", "second", etc. are used as indicative terms only and are not a quantitative limitation on their objects.

[0028] Example 1 1 to 13, the measurable electromagnetic relay of the present invention is a two-path measurement electromagnetic relay, and includes a housing 1, a PCB board 2, and an extension sheet 3 extending from inside the housing to the outside of a first side of the housing and connected to a contact assembly inside the housing. Here, there are four extension sheets 3, and the four extension sheets are arranged in order along the first side of the housing 1, that is, the extension sheet 33, the extension sheet 31, the extension sheet 32, and the extension sheet 34 are arranged in order along the first side of the housing 1. Here, the two extension sheets 31 and 32 located in the middle are each connected to a contact assembly in one path inside the housing by one side of the first side of the housing, and one extension sheet 33 of the two extension sheets located on both sides is detouring from the bottom of the housing to a point approaching the other extension sheet 34, and is connected to a contact assembly in another path inside the housing by the other side of the first side of the housing. Of the lead-out sheets 31 and 32, the lead-out sheet 31 includes a plate-shaped sampling resistance sheet 4 made of a material with high resistivity and a conductive sheet 6 connected to both ends of the sampling resistance sheet 4, and of the lead-out sheets 33 and 34, the lead-out sheet 33 includes a plate-shaped sampling resistance sheet 4 made of a material with high resistivity and a conductive sheet 6 connected to both ends of the sampling resistance sheet 4. Hereinafter, the structure of the sampling resistance sheet 4 will be specifically described using the lead-out sheet 33 (as shown in Figures 12 and 13). The structure of the sampling resistance sheet 4 of the lead-out sheet 31 is the same as the structure of the sampling resistance sheet 4 of the lead-out sheet 33, and the lead-out sheet 33 is an external lead-out sheet, and the lead-out sheet 33 is also accessed into the housing by an internal lead-out sheet 331 (not shown). Two sampling pins 41 extending in the same direction are provided at both ends of the sampling resistance sheet 4 to realize the inflow and outflow of current.The PCB board 2 has two sampling resistance sheets (i.e., the sampling resistance sheet 4 of the lead sheet 31 and the sampling resistance sheet 4 of the lead sheet 33) with sampling pins 41 at both ends inserted and connected by welding. The two sampling resistance sheets 4 have through holes 42 formed along the thickness direction of the plate body, so that the first sealing ring S1 formed by the through holes 42 cancels the induced current generated by the external alternating magnetic field, and the second sealing ring S2 surrounded by the sampling resistance sheet 4, the sampling pins 41 and the PCB board 2 cancels the induced current generated by the external alternating magnetic field (as shown in FIG. 6), thereby improving the anti-interference ability when the relay is measured in an alternating magnetic field. As can be seen from the law of electromagnetic induction, E=-N and φ=B*S, where φ is the magnetic flux passing through the closed circuit, t is the time, B is the strength of magnetic induction, and S is the area perpendicular to the magnetic field direction. When the area of ​​the first sealing ring S1 formed by the through hole 42 is set to the area of ​​the second sealing ring S2 surrounded by the sampling resistive sheet 4, the sampling pin 41 and the PCB board 2, the external magnetic interference can be completely cancelled out.

[0029] In this embodiment, the two sampling pins 41 in the same sampling resistive sheet are connected to the upper surfaces of the corresponding sampling resistive sheets 4 at both ends, respectively.

[0030] Of course, two sampling pins on the same sampling resistive sheet may be connected to the upper surface of the conductive sheet on the outer ends of the corresponding sampling resistive sheet, respectively.

[0031] In this embodiment, the sampling pins 41 of the two sampling resistive sheets 4 are inserted into the PCB board 2 on the same plane and connected by welding.

[0032] In this embodiment, the housing 1 is further provided with a coil pin 5 extending from within the housing, and the coil pin 5 and the sampling pins 41 of the two sampling resistive sheets 4 are each inserted into the PCB board 2 on the same plane and connected by welding.

[0033] In this embodiment, the sampling pins 41 on the two sampling resistive sheets 4 are each provided as a pin-type structure.

[0034] In this embodiment, a first boss 43 is further provided at the connection point of the sampling pin 41 with the corresponding sampling resistive sheet 4, and the cross-section of the first boss 43 is larger than the cross-section of the sampling pin 41, and the PCB board 2 is hung on the upper surface of the first boss 43.

[0035] In this embodiment, the outer surface of the sampling pin 41 corresponding to a part of the upper surface of the first boss 43 is further coated with a solder layer 44 .

[0036] In this embodiment, the through-hole 42 of the sampling resistive sheet 4 is located on a vertical line passing through the midpoint of the connection line between the two sampling pins 41 .

[0037] In this embodiment, the coil pins 5 are distributed on the upper surface of the housing close to the second side of the housing, which faces the first side of the housing 1, and a second boss 11 is further provided on each side of the upper surface of the housing close to the second side of the housing 1, and the height position of the upper surface of the second boss 11 is flush with the height position of the upper surface of the first boss 43. The PCB board 2 is hung on the upper surface of the first boss 43 and the upper surface of the second boss 11.

[0038] In this embodiment, the sampling resistive sheet 4 is a manganese copper piece.

[0039] The electronic energy meter of the present invention includes a dual path metering relay as described above.

[0040] The measurable electromagnetic relay and its electronic watt-hour meter of the present invention are provided with one lead-out sheet including a plate-shaped sampling resistor sheet 4 made of a material with high resistivity in each lead-out sheet of each path, and the sampling resistor sheet 4 is provided with two sampling pins 41 extending in the same direction to realize the inflow and outflow of current. The sampling pins 41 of the two sampling resistor sheets 4 are inserted into the PCB board 2 and connected by welding. The two sampling resistor sheets 4 are each provided with a through hole 42 along the thickness direction of the plate, so that the first sealing ring S1 formed by the through hole 42 cancels the induced current generated by the external alternating magnetic field, and the second sealing ring S2 surrounded by the sampling resistor sheet 4, the sampling pin 41 and the PCB board 2 cancels the induced current generated by the external alternating magnetic field, thereby improving the anti-interference ability when the relay measures in an alternating magnetic field. The present invention uses sampling resistance sheets 4 in two paths as a sampling circuit for measurement, and the sampling resistance sheets 4 in the two paths are installed so that the sampling pins 41 in the same direction are directly inserted into the PCB board 2 and fixed by welding, thereby avoiding many disadvantages caused by the signal line connection in the prior art, and has the characteristics of low manufacturing cost, easy installation, and high degree of automation. The present invention has the characteristics that the through hole 42 of the sampling resistance sheet 4 is induced by the external alternating magnetic field, and the second sealing ring surrounded by the sampling resistance sheet 4, the sampling pins 41, and the PCB board 2 cancels the induced current caused by the external alternating magnetic field, thereby reducing the influence of the alternating electromagnetic field interfering with the accuracy of measurement using manganese copper, and improving the anti-interference ability when the relay is measured in an alternating magnetic field.

[0041] Example 2 14 to 18, the measurable electromagnetic relay and its electronic watt-hour meter of the present invention are different from Example 1 in that the electromagnetic relay is a single-path measurement electromagnetic relay, has only two lead-out sheets, and of the two lead-out sheets 33 and 34, the lead-out sheet 33 includes a plate-shaped sampling resistance sheet 4 made of a material with high resistivity. Another difference from Example 1 is that the second boss 11 is not provided on the upper surface of the housing, but a third boss 12 is provided at the position of the coil pin 5, and the PCB board 2 is hung on the upper surface of the first boss 43 and the upper surface of the third boss 12.

[0042] In addition, a dual-path measurement relay used in an electronic watt-hour meter according to the prior art usually includes a housing, a contact assembly in the housing, and a lead-out sheet connected to the corresponding contact assembly in the housing. Such a dual-path measurement relay is provided with four lead-out sheets, with each of two lead-out sheets forming one path, and the contact assemblies in the corresponding one path are respectively connected. In the lead-out sheets in the two paths, one of the two lead-out sheets in each path is provided with a measuring device, and one of the lead-out sheets in one of the paths is provided with a manganese copper piece for measurement as a sampling circuit, and one of the lead-out sheets in the other path is equipped with a current transformer (CT) for measurement as a sampling circuit. The dual-path measurement relay with such a measurement mode according to the prior art mainly has the following disadvantages. First, the measurement in one of the paths uses a current transformer, which increases the cost of the relay and affects the competitiveness of the product. Secondly, the manganese copper pieces and the current transformer are both connected by signal lines, and the coil leads are also connected by signal lines, which makes the production process complicated, increases the number of signal lines, makes it easy for welding errors to occur, and results in high labor costs and low automation.

[0043] The present invention further provides a two-path measurement relay and an electronic watt-hour meter thereof, which, through structural improvements, avoids many of the disadvantages caused by connection via signal lines, has the characteristics of low manufacturing costs, easy installation, and high degree of automation, and can improve the anti-interference ability when the relay is measuring in an alternating magnetic field.

[0044] The technical solution used in the present invention to solve the technical problem is as follows: a two-path measurement relay including a housing, a PCB board, and a lead-out sheet extending from inside the housing to the outside of a first side of the housing and connected to a contact assembly in the housing, there are four lead-out sheets, and the contact assembly in a corresponding one of the paths is connected to each of the two lead-out sheets, and each lead-out sheet of the path includes a plate-shaped sampling resistor sheet made of a material with high resistivity and a conductive sheet connected to both ends of the sampling resistor sheet, and two sampling pins extending in the same direction are provided at both ends of the sampling resistor sheet to realize current inflow and outflow. The sampling pins of the two lead-out sheets are inserted into the PCB board and connected by welding.

[0045] The two sampling resistive sheets each have a through hole along the thickness direction of the plate. The first sealing ring formed by the through hole cancels out the induced current generated by the external alternating magnetic field, while the second sealing ring surrounded by the sampling resistive sheet, the sampling pin and the PCB board cancels out the induced current generated by the external alternating magnetic field, thereby improving the anti-interference capability when the relay is measuring in an alternating magnetic field.

[0046] The sampling pins of the two extraction sheets are inserted into the PCB board on the same plane and connected by welding.

[0047] The housing is further provided with a coil pin extending from within the housing, and the coil pin and the sampling pins of the two extraction sheets are respectively inserted into the PCB board on the same plane and connected by welding.

[0048] The two sampling pins on the same extraction sheet are each connected to the upper surface of a corresponding sampling resistive sheet.

[0049] The two sampling pins on the same extraction sheet are each connected to the upper surface of a corresponding conductive sheet.

[0050] Each of the sampling pins is provided as a pin-type structure.

[0051] A first boss is further provided at the connection point of the sampling pin with the corresponding extraction sheet, and the cross section of the first boss is larger than the cross section of the sampling pin, and the PCB board is hung on the upper surface of the first boss.

[0052] In the sampling pin, an outer surface corresponding to a portion of the upper surface of the first boss is further coated with a solder layer.

[0053] The through hole of the sampling resistive sheet is located on a vertical line passing through the midpoint of the connection line between the two sampling pins.

[0054] The through hole of the sampling resistive sheet is located exactly at the center of the sampling resistive sheet.

[0055] The coil pins are distributed on an upper surface of the housing near a second side of the housing opposite to the first side of the housing, and a second boss is further provided on each of both sides of the upper surface of the housing near the second side of the housing, and the height position of the upper surface of the second boss is flush with the height position of the upper surface of the first boss, and the PCB board is hung on the upper surface of the first boss and the upper surface of the second boss.

[0056] The four pull-out sheets are arranged in sequence along the first side of the housing, with the two intermediate pull-out sheets each being connected to a contact assembly in one path within the housing by one edge of the first side of the housing, and one of the two pull-out sheets located on both sides making a detour from the bottom of the housing to a point approaching the other pull-out sheet, and then being connected to a contact assembly in another path within the housing by the other edge of the first side of the housing.

[0057] The sampling resistive sheet is a manganese copper piece or a constantan piece.

[0058] The electronic energy meter includes a two-path metering relay as described above.

[0059] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, each of the lead-out sheets of each path is provided with one lead-out sheet including a plate-shaped sampling resistor sheet made of a material with high resistivity, and the sampling resistor sheet is provided with two sampling pins extending in the same direction to realize current inflow and outflow. The sampling pins of the two lead-out sheets are inserted into the PCB board and connected by welding. The present invention uses the sampling resistor sheets of the two paths as a sampling circuit for measurement, and the sampling resistor sheets of the two paths are installed so that the sampling pins of the same direction are directly inserted into the PCB board and fixed by welding, thereby avoiding many of the disadvantages caused by connection by signal lines in the prior art, and has the characteristics of low manufacturing cost, easy installation, and high degree of automation.

[0060] Furthermore, in the present invention, the two sampling resistive sheets are each provided with a through hole along the thickness direction of the plate, so that the first sealing ring formed by the through hole cancels the induced current generated by the external alternating magnetic field, and the second sealing ring surrounded by the sampling resistive sheet, the sampling pin, and the PCB board cancels the induced current generated by the external alternating magnetic field, thereby improving the interference prevention ability when the relay measures in an alternating magnetic field. In the present invention, the through hole of the sampling resistive sheet cancels the induced current generated by the external alternating magnetic field, so that the influence of the alternating electromagnetic field interfering with the accuracy of measurement with manganese copper can be reduced, and the interference prevention ability when the relay measures in an alternating magnetic field can be improved.

[0061] The present invention will be described in more detail below with reference to the drawings and embodiments, but the dual path metering relay and its electronic watt-hour meter of the present invention are not limited to the embodiments.

[0062] Example 3 19 to 30, the dual path measurement relay of the present invention includes a housing 1, a PCB board 2, and an extension sheet 3 extending from inside the housing to the outside of a first side of the housing and connected to a contact assembly in the housing. Here, there are four extension sheets 3, and the four extension sheets are arranged in order along the first side of the housing 1, that is, the extension sheet 33, the extension sheet 31, the extension sheet 32, and the extension sheet 34 are arranged in order along the first side of the housing 1. Here, the two extension sheets 31 and 32 located in the middle are each connected to a contact assembly in one path in the housing by one side of the first side of the housing, and one extension sheet 33 of the two extension sheets located on both sides is detouring from the bottom of the housing to a point approaching the other extension sheet 34, and is connected to a contact assembly in another path in the housing by the other side of the first side of the housing. Of the lead-out sheets 31 and 32, the lead-out sheet 31 includes a plate-shaped sampling resistance sheet 4 made of a material with high resistivity and a conductive sheet 6 connected to both ends of the sampling resistance sheet 4, and of the lead-out sheets 33 and 34, the lead-out sheet 33 includes a plate-shaped sampling resistance sheet 4 made of a material with high resistivity and a conductive sheet 6 connected to both ends of the sampling resistance sheet 4. Hereinafter, the structure of the sampling resistance sheet 4 will be specifically described using the lead-out sheet 33 (as shown in Figures 11 and 12). The structure of the sampling resistance sheet 4 of the lead-out sheet 31 is the same as the structure of the sampling resistance sheet 4 of the lead-out sheet 33, and the lead-out sheet 33 is an external lead-out sheet, and the lead-out sheet 33 is also accessed into the housing by an internal lead-out sheet 331 (not shown). Two sampling pins 41 extending in the same direction are provided at both ends of the sampling resistance sheet 4 to realize the inflow and outflow of current.Sampling pins 41 at both ends of two sampling resistance sheets (that is, the sampling resistance sheet 4 of the lead-out sheet 31 and the sampling resistance sheet 4 of the lead-out sheet 33) are inserted into the PCB board 2 and connected by welding.

[0063] In this embodiment, the two sampling pins 41 in the same sampling resistive sheet are connected to the upper surfaces of the corresponding sampling resistive sheets 4 at both ends, respectively.

[0064] Of course, two sampling pins on the same sampling resistive sheet may be connected to the upper surface of the conductive sheet on the outer ends of the corresponding sampling resistive sheet, respectively.

[0065] In this embodiment, the sampling pins 41 of the two sampling resistive sheets 4 are inserted into the PCB board 2 on the same plane and connected by welding.

[0066] In this embodiment, the housing 1 is further provided with a coil pin 5 extending from within the housing, and the coil pin 5 and the sampling pins 41 of the two sampling resistive sheets 4 are each inserted into the PCB board 2 on the same plane and connected by welding.

[0067] In this embodiment, the sampling pins 41 on the two sampling resistive sheets 4 are each provided as a pin-type structure.

[0068] In this embodiment, a first boss 43 is further provided at the connection point of the sampling pin 41 with the corresponding sampling resistive sheet 4, and the cross-section of the first boss 43 is larger than the cross-section of the sampling pin 41, and the PCB board 2 is hung on the upper surface of the first boss 43.

[0069] In this embodiment, the outer surface of the sampling pin 41 corresponding to a part of the upper surface of the first boss 43 is further coated with a solder layer 44 .

[0070] In this embodiment, the through-hole 42 of the sampling resistive sheet 4 is located on a vertical line passing through the midpoint of the connection line between the two sampling pins 41 .

[0071] In this embodiment, the coil pins 5 are distributed on the upper surface of the housing near a second side of the housing opposite to the first side of the housing 1, and a second boss 11 is further provided on each side of the upper surface of the housing near the second side of the housing 1, and the height position of the upper surface of the second boss 11 is flush with the height position of the upper surface of the first boss 43. The PCB board 2 is hung on the upper surface of the first boss 43 and the upper surface of the second boss 11.

[0072] In this embodiment, the sampling resistive sheet 4 is a manganese copper piece, and the conductive sheet 6 is a tough pitch copper piece.

[0073] The electronic energy meter of the present invention includes a dual path metering relay as described above.

[0074] The two-path measurement relay and its electronic watt-hour meter of the present invention are provided with one lead-out sheet for each path, including a plate-shaped sampling resistive sheet 4 made of a material with high resistivity, and the sampling resistive sheet 4 is provided with two sampling pins 41 extending in the same direction to realize current inflow and outflow. The sampling pins 41 of the two lead-out sheets are inserted into the PCB board 2 and connected by welding. The present invention uses sampling resistive sheets in two paths as a sampling circuit for measurement, and the sampling resistive sheets in the two paths are installed so that the sampling pins in the same direction are directly inserted into the PCB board and fixed by welding, thereby avoiding many of the disadvantages caused by connection by signal lines in the prior art, and has the characteristics of low manufacturing cost, easy installation, and high degree of automation.

[0075] Example 4 31 to 35, the difference between the two-path measurement relay and its electronic watt-hour meter of the present invention and the third embodiment is that the sampling resistive sheet 4 of the drawing sheet 31 and the sampling resistive sheet 4 of the drawing sheet 33 are provided with through holes 42 along the thickness direction of the plate, so that the first sealing ring S1 formed by the through holes 42 cancels the induced current generated by the external alternating magnetic field, and the second sealing ring S2 surrounded by the sampling resistive sheet 4, the sampling pin 41 and the PCB board 2 cancels the induced current generated by the external alternating magnetic field (as shown in FIG. 14), thereby improving the interference prevention ability when the relay is measured in an alternating magnetic field. As can be seen from the law of electromagnetic induction, E=-N, φ=B*S, where φ is the magnetic flux passing through the closed circuit, t is time, B is the strength of magnetic induction, and S is the area perpendicular to the magnetic field direction. When the area of ​​the first sealing ring S1 formed by the through hole 42 is set to the area of ​​the second sealing ring S2 surrounded by the sampling resistive sheet 4, the sampling pin 41 and the PCB board 2, external magnetic interference can be cancelled out. In the dual-path measurement relay and electronic watt-hour meter of the present invention, the two sampling resistive sheets 4 are provided with through holes 42 along the thickness direction of the plate, so that the first sealing ring S1 formed by the through holes 42 is induced by the external alternating magnetic field, and the second sealing ring S2 surrounded by the sampling resistive sheet 4, the sampling pin 41, and the PCB board 2 cancels the induced current generated by the external alternating magnetic field, thereby improving the interference prevention ability when the relay measures in an alternating magnetic field. In the present invention, the through holes 42 of the sampling resistive sheet are induced by the external alternating magnetic field, and the second sealing ring surrounded by the sampling resistive sheet 4, the sampling pin 41, and the PCB board 2 cancels the induced current generated by the external alternating magnetic field, thereby reducing the influence of the alternating electromagnetic field interfering with the accuracy of measurement using manganese copper, and improving the interference prevention ability when the relay measures in an alternating magnetic field.

[0076] It should be understood that the present invention is not limited in its application to the detailed construction and arrangement of parts presented herein. The present invention may have other embodiments and may be realized and carried out in various ways. The above variations and modifications are within the scope of the present invention. It should be understood that the present invention as disclosed and limited herein extends to all alternative combinations of two or more distinct features mentioned or illustrated in this specification and / or the drawings. All of these different combinations constitute multiple alternative aspects of the present invention. The embodiments described herein describe the most preferred modes known for carrying out the present invention and enable those skilled in the art to utilize the present invention.

Claims

1. A measurable electromagnetic relay comprising: a housing; a PCB board; and two lead-out sheets extending from within the housing to the outside of a first side of the housing and connected to a contact assembly within the housing, one of the two lead-out sheets comprising a plate-shaped sampling resistance sheet made of a material with high resistivity and a conductive sheet connected to both ends of the sampling resistance sheet, the lead-out sheet being provided with two sampling pins extending in the same direction at both ends of the sampling resistance sheet to realize current inflow and outflow, the two sampling pins being inserted into the PCB board and connected by welding, The sampling resistive sheet has through holes formed along the thickness direction of the plate, and the first sealing ring formed by the through holes cancels out the induced current generated by the external alternating magnetic field, while the second sealing ring surrounded by the sampling resistive sheet, the sampling pins, and the PCB board cancels out the induced current generated by the external alternating magnetic field, thereby improving the interference prevention capability when the relay is measuring an alternating magnetic field.

1. A measurable electromagnetic relay.

2. The area of ​​the first sealing ring is the same as that of the second sealing ring, and the first sealing ring completely cancels the induced current generated by the external alternating magnetic field through the second sealing ring.

2. The scalable electromagnetic relay according to claim 1.

3. There are two lead-out sheets extending from inside the housing to the outside of the first side of the housing and connected to a contact assembly inside the housing, the contact assembly inside the housing is one path, and one of the two lead-out sheets includes the sampling resistance sheet.

3. A scalable electromagnetic relay according to claim 1 or 2.

4. There are four lead-out sheets extending from inside the housing to the outside of the first side of the housing and connected to the contact assemblies inside the housing, and the contact assemblies inside the housing are two paths, and two of the four lead-out sheets are connected to the contact assemblies in one corresponding path, and each lead-out sheet in each path includes one lead-out sheet including the sampling resistor sheet.

3. A scalable electromagnetic relay according to claim 1 or 2.

5. The sampling pins are inserted into the PCB board on the same plane and connected by welding.

3. A scalable electromagnetic relay according to claim 1 or 2.

6. The housing is further provided with a coil pin extending from within the housing, and the coil pin and the sampling pin are inserted into the PCB board on the same plane and connected by welding.

6. A scalable electromagnetic relay as claimed in claim 5.

7. The two sampling pins on the same extraction sheet are each connected to the upper surface of the corresponding sampling resistance sheet.

6. A scalable electromagnetic relay as claimed in claim 5.

8. The two sampling pins on the same extraction sheet are each connected to the upper surface of the corresponding conductive sheet.

6. A scalable electromagnetic relay as claimed in claim 5.

9. The sampling pin is provided as a pin-type structure.

9. Scalable electromagnetic relay according to claim 7 or 8.

10. The sampling pin is further provided with a first boss at a connection point with the corresponding lead-out sheet, and the cross section of the first boss is larger than the cross section of the sampling pin, and the PCB board is hung on the upper surface of the first boss.

7. The scalable electromagnetic relay of claim 6.

11. The sampling pin has an outer surface corresponding to a portion of the upper surface of the first boss, and is further coated with a solder layer.

11. The scalable electromagnetic relay of claim 10.

12. The through hole of the sampling resistive sheet is located on a vertical line passing through the midpoint of the connection line between the two sampling pins.

3. A scalable electromagnetic relay according to claim 1 or 2.

13. The coil pins are distributed on an upper surface of the housing close to a second side of the housing, the second side of the housing faces the first side of the housing, a second boss is further provided on each of both sides of the upper surface of the housing close to the second side of the housing, and a height position of an upper surface of the second boss is flush with a height position of an upper surface of the first boss, and the PCB board is hung on the upper surface of the first boss and the upper surface of the second boss.

11. The scalable electromagnetic relay of claim 10.

14. The four pull-out sheets are arranged in order along the first side of the housing, and the two intermediate pull-out sheets are each connected to a contact assembly in one path within the housing by one side of the first side of the housing, and one of the two pull-out sheets located on both sides makes a detour from the bottom of the housing to a point approaching the other pull-out sheet, and is connected to a contact assembly in another path within the housing by the other side of the first side of the housing.

4. The scalable electromagnetic relay according to claim 3.

15. The sampling resistive sheet is a manganese copper piece or a constantan piece.

2. The scalable electromagnetic relay according to claim 1.

16. An electronic watt-hour meter including a measurable electromagnetic relay according to any one of claims 1 to 14.

17. A dual path measurement relay including a housing, a PCB board, and a lead-out sheet extending from within the housing to an exterior of a first side of the housing and connected to a contact assembly within the housing, the lead-out sheet being four in number, and a contact assembly in a corresponding one of the paths being connected to each of two lead-out sheets, Each of the lead-out sheets for each path is provided with a lead-out sheet including a plate-shaped sampling resistance sheet made of a material with high resistivity and a conductive sheet connected to both ends of the sampling resistance sheet, and two sampling pins extending in the same direction are provided at both ends of the sampling resistance sheet to realize the inflow and outflow of current, and the sampling pins of the two lead-out sheets are inserted into the PCB board and connected by welding. A dual path measurement relay.

18. The two sampling resistive sheets each have a through hole formed along the thickness direction of the plate, and the first sealing ring formed by the through hole cancels out the induced current generated by the external alternating magnetic field, while the second sealing ring surrounded by the sampling resistive sheet, the sampling pin, and the PCB board cancels out the induced current generated by the external alternating magnetic field, thereby improving the interference prevention capability when the relay is measuring in an alternating magnetic field.

20. A dual path measurement relay as claimed in claim 17.

19. The sampling pins of the two extraction sheets are inserted into the PCB board on the same plane and connected by welding.

20. A dual path measurement relay as claimed in claim 17.

20. The housing is further provided with a coil pin extending from within the housing, and the coil pin and the sampling pins of the two extraction sheets are inserted into the PCB board on the same plane and connected by welding.

20. A dual path measurement relay as claimed in claim 19.

21. The two sampling pins on the same extraction sheet are connected to the upper surfaces of the corresponding sampling resistive sheets at both ends.

20. A dual path measurement relay as claimed in claim 19.

22. The two sampling pins on the same extraction sheet are connected to the upper surface of the conductive sheet on both ends of the corresponding sampling resistive sheet.

20. A dual path measurement relay as claimed in claim 19.

23. Each of the sampling pins on the two extraction sheets is provided as a pin-type structure.

23. A dual path measurement relay according to claim 21 or 22.

24. The sampling pin is further provided with a first boss at a connection point with the corresponding sampling resistive sheet, and the cross section of the first boss is larger than the cross section of the sampling pin, and the PCB board is hung on the upper surface of the first boss.

21. A dual path measurement relay as claimed in claim 20.

25. The sampling pin has an outer surface corresponding to a portion of the upper surface of the first boss, and is further coated with a solder layer.

25. A dual path measurement relay as claimed in claim 24.

26. The through hole of the sampling resistive sheet is located on a vertical line passing through the midpoint of the connection line between the two sampling pins.

20. A dual path measurement relay as claimed in claim 18.

27. The through hole of the sampling resistive sheet is located exactly at the center position of the sampling resistive sheet.

27. A dual path measurement relay as claimed in claim 26.

28. The coil pins are distributed on an upper surface of the housing near a second side of the housing opposite to the first side of the housing, and a second boss is further provided on each of both sides of the upper surface of the housing near the second side of the housing, and a height position of an upper surface of the second boss is flush with a height position of an upper surface of the first boss, and the PCB board is hung on the upper surfaces of the first boss and the second boss.

25. A dual path measurement relay as claimed in claim 24.

29. The four pull-out sheets are arranged in order along the first side of the housing, and the two intermediate pull-out sheets are each connected to a contact assembly in one path within the housing by one side of the first side of the housing, and one of the two pull-out sheets located on both sides makes a detour from the bottom of the housing to a point approaching the other pull-out sheet, and is connected to a contact assembly in another path within the housing by the other side of the first side of the housing.

20. A dual path measurement relay as claimed in claim 17.

30. 30. An electronic energy meter including a dual path metering relay according to any one of claims 17 to 29.

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