Melectromagnetic relay capable of performing measurement, and electronic electricity meter comprising same

Abstract

To provide an improved two-set metering relay.SOLUTION: An electromagnetic relay capable of performing measurement, includes: a housing; a PCB; and two lead-out sheets which extend outward on a first side of the housing from within the housing and are connected to a contact point assembly in the housing. One of the two lead-out sheets includes: a tabular sampling resistor sheet made of a high-resistivity material; and conductive sheets connected to both ends of the sampling resistor sheet. The one of the two lead-out sheets is provided with, at positions of both ends of the sampling resistor sheet, two sampling pins extending in the same direction, so as to allow inflow and outflow of a current. The two sampling pins are inserted into and connected, by welding, to the PCB.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present invention claims priority to Chinese patent application No. 202111659685.7, filed on December 30, 2021, and Chinese patent application No. 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 a dedicated integrated circuit for the watt-hour meter to process the sampled voltage and current signals and convert them into pulse outputs proportional to the electrical energy, which are then displayed on a resistor or digital display. In an electronic watt-hour meter, a load circuit is usually controlled by a relay. 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). It is usually used in automatic control circuits and is actually an "automatic switch" that controls large currents with small currents, and in the circuit it plays roles such as automatic adjustment, safety protection, and conversion circuitry. 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 the signal line, a welding process is required, which has disadvantages such as a complex process, high manufacturing costs, and low automation, and also reduces measurement accuracy due to interference from external magnetic fields.

[0004] Furthermore, the measurable electromagnetic relay used in the electronic watt-hour meter according to the prior art performs measurement using two paths. Such a dual-path measurement relay has four lead-out sheets, each of which forms one path, and the contact assemblies in the corresponding path are connected to one another. One of the two lead-out sheets in each path is equipped with a measuring device, with one lead-out sheet in one of the paths equipped with a manganese copper piece for measurement as a sampling circuit, and the other lead-out sheet in the other path equipped with a current transformer for measurement as a sampling circuit. This prior art dual-path measurement relay with such measurement mode has the following main drawbacks: First, measurement using one of the paths requires the use of 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 welding errors more likely to occur, increases labor costs, and reduces the degree of automation. Summary of the Invention

[0005] The object of the present invention is to overcome the drawbacks of the prior art and provide a measurable electromagnetic relay and an electronic watt-hour meter thereof, which, through structural improvements, can improve the anti-interference capability when the relay measures in an alternating magnetic field, while avoiding many of the disadvantages caused by connecting via 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-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 including a plate-shaped sampling resistor sheet made of a high resistivity material and a conductive sheet connected to both ends of the sampling resistor sheet, two sampling pins extending in the same direction are provided on 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 has through holes formed along the thickness direction of the plate, a first sealing ring formed by the through holes cancels out the induced current generated by an external alternating magnetic field, and a second sealing ring surrounded by the sampling resistor sheet, the sampling pins and the PCB board cancels 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 generates an induced current due to an external alternating magnetic field, which is then completely canceled out by the second sealing ring surrounded by the sampling resistive sheet, the sampling pins, and the PCB board.

[0008] There are two lead-out sheets extending from within the housing to the outside of the 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 are two paths, and two of the four lead-out sheets are connected to the contact assemblies in a corresponding path, and each path lead-out sheet has one lead-out sheet including 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 inserted into the PCB board on the same plane and connected by welding.

[0012] The two sampling pins on the same extraction sheet are connected to the upper surfaces of the corresponding sampling resistive sheets, respectively.

[0013] The two sampling pins on the same extraction sheet are connected to the upper surfaces of the corresponding conductive sheets, respectively.

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

[0015] The sampling pin further has a first boss at the 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] 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.

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

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

[0019] The four pull-out sheets are arranged in order along the first side of the housing, and the two middle pull-out sheets are each 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 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 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 has through holes formed in the thickness direction of the plate, and a first sealing ring formed by the through holes allows the induced current generated by an external AC magnetic field to pass through, and a second sealing ring surrounded by the sampling resistive sheet, the sampling pins, and the PCB board to cancel out the induced current generated by the external AC magnetic field, thereby improving the relay's ability to prevent interference when measuring in an AC magnetic field.This structure of the present invention reduces the influence of AC electromagnetic fields on the accuracy of measurements using manganese copper, and improves the relay's ability to prevent interference when measuring in an AC magnetic field, by allowing the through holes in the sampling resistive sheet to pass through, and the second sealing ring surrounded by the sampling resistive sheet, the sampling pins, and the PCB board to cancel out the induced current generated by the external AC magnetic field.

[0023] Furthermore, the present invention provides a structure in which two of the four lead sheets are connected to a contact assembly in a corresponding path, and each lead sheet includes a plate-shaped sampling resistor sheet made of a high-resistivity material and conductive sheets 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 of the same direction are directly inserted into the PCB board and fixed by welding, thereby avoiding many of the drawbacks of connecting using signal lines in the prior art and offering the advantages of low manufacturing costs, easy installation, and a 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 explanation 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. [Figure 2] 1 is a front view of a measurable electromagnetic relay according to a first embodiment of the present invention. [Figure 3] 1 is a top view of a measurable electromagnetic relay according to a first embodiment of the present invention. [Figure 4] 1 is a left side view of a measurable electromagnetic relay according to a first embodiment of the present invention. [Figure 5] 1 is a right side view of a measurable electromagnetic relay according to a first embodiment of the present invention. [Figure 6] FIG. 3 is an enlarged schematic view of a portion A in FIG. 2. [Figure 7] 1 is a schematic diagram of a three-dimensional structure of a measurable electromagnetic relay (without a PCB board attached) according to a first embodiment of the present invention; [Figure 8] 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] 1 is a top view of a scalable electromagnetic relay (without a PCB board attached) according to a first embodiment of the present invention; [Figure 10] 1 is a left side view of a scalable electromagnetic relay (without a PCB board attached) according to a first embodiment of the present invention; [Figure 11] 1 is a right side view of a scalable electromagnetic relay (without a PCB board attached) according to a first embodiment of the present invention. FIG. [Figure 12] 1 is a schematic diagram of the three-dimensional structure of one lead sheet in a measurable electromagnetic relay according to Example 1 of the present invention. FIG. [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. 10 is a schematic diagram of the 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. 10 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. 10 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. 10 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. 10 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] FIG. 10 is a schematic diagram of a three-dimensional structure of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 20] FIG. 10 is a front view of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 21] FIG. 10 is a top view of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 22] FIG. 10 is a left side view of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 23] FIG. 10 is a right side view of a dual-path measurement relay according to a third embodiment of the present invention. [Figure 24] FIG. 10 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. [Figure 25] FIG. 10 is a front view of a dual-path measurement relay (without a PCB board attached) according to a third embodiment of the present invention. [Figure 26] FIG. 10 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. 10 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. 10 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] FIG. 10 is a schematic diagram of the three-dimensional structure of one drawer sheet in a double-path measurement relay according to Example 3 of the present invention. [Figure 30] FIG. 10 is a front view of one drawer sheet in a double-path measurement relay according to a third embodiment of the present invention. [Figure 31] FIG. 10 is a front view of a dual-path measurement relay according to a fourth embodiment of the present invention. [Figure 32] FIG. 32 is an enlarged schematic view of a portion B in FIG. 31. [Figure 33] FIG. 10 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. [Figure 34] FIG. 10 is a schematic diagram of the three-dimensional structure of one drawer sheet in a dual-path measurement relay according to Example 4 of the present invention. [Figure 35] FIG. 10 is a front view of one drawer sheet in a double-path measurement relay according to Example 4 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] Next, exemplary embodiments will be described more fully with reference to the drawings. However, the exemplary embodiments may be implemented in a variety of forms and should not be understood as being limited to the embodiments described herein. Relative terms, such as "above" and "below," are used herein to describe the relative relationship between one assembly and another assembly shown in the drawings. However, these terms are used merely for convenience and are based on, for example, the exemplary orientation shown in the drawings. If the device shown in the drawings is inverted so that its top and bottom are reversed, it will 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, this 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 "have" are used to denote an open inclusion and mean that other elements / components / etc. may be present in addition to the listed elements / components / etc.; and the terms "first," "second," etc. are used as indicative terms only and not as a quantitative limitation of their objects.

[0028] Example 1 1 to 13, the measurable electromagnetic relay of the present invention is a dual-path measurable electromagnetic relay, and includes a housing 1, a PCB board 2, and a lead-out sheet 3 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 number of lead-out sheets 3 is four, and the four lead-out sheets are arranged in order along the first side of the housing 1, i.e., lead-out sheet 33, lead-out sheet 31, lead-out sheet 32, and lead-out sheet 34 are arranged in order along the first side of the housing 1. The two intermediate lead-out sheets 31 and 32 are connected to a contact assembly in one path within the housing by one edge of the first side of the housing, and one lead-out sheet 33 of the two lead-out sheets located on both sides makes a detour from the bottom of the housing to a point approaching the other lead-out sheet 34, and is connected to a contact assembly in another path within the housing by the other edge of the first side of the housing. Of the two lead sheets 31 and 32, the lead sheet 31 includes a plate-shaped sampling resistive sheet 4 made of a high-resistivity material and a conductive sheet 6 connected to both ends of the sampling resistive sheet 4. Of the two lead sheets 33 and 34, the lead sheet 33 includes a plate-shaped sampling resistive sheet 4 made of a high-resistivity material and a conductive sheet 6 connected to both ends of the sampling resistive sheet 4. The structure of the sampling resistive sheet 4 will be specifically described below using the lead sheet 33 (as shown in Figures 12 and 13). The structure of the sampling resistive sheet 4 of the lead sheet 31 is the same as that of the lead sheet 33. The lead sheet 33 is an external lead sheet, and the lead sheet 33 is also accessed into the housing by an internal lead sheet 331 (not shown). Two sampling pins 41 extending in the same direction are provided at both ends of the sampling resistive sheet 4 to allow current to flow in and out.The PCB board 2 has two sampling resistor sheets (i.e., the sampling resistor sheet 4 on the lead-out sheet 31 and the sampling resistor sheet 4 on the lead-out sheet 33) with sampling pins 41 inserted at both ends and connected by welding. The two sampling resistor sheets 4 each have a through-hole 42 formed along the thickness direction of the plate. The first sealing ring S1 formed by the through-hole 42 allows the induced current generated by an external AC magnetic field to pass through, while the second sealing ring S2 surrounded by the sampling resistor sheet 4, the sampling pin 41, and the PCB board 2 cancels out the induced current (as shown in Figure 6). This improves the relay's ability to prevent interference when measuring in an AC magnetic field. As can be seen from the law of electromagnetic induction,

number

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

[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 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 connecting line between the two sampling pins 41 .

[0037] In this embodiment, the coil pins 5 are distributed on the upper surface of the housing near the second side thereof, which faces the first side of the housing 1. 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 surfaces of the first boss 43 and 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] In the measurable electromagnetic relay and electronic watt-hour meter of the present invention, each path has a lead-out sheet including a plate-shaped sampling resistor sheet 4 made of a high-resistivity material. The sampling resistor sheet 4 has two sampling pins 41 extending in the same direction to allow current to flow in and out. The sampling pins 41 of each of the two sampling resistor sheets 4 are inserted into a PCB board 2 and connected by welding. Each of the two sampling resistor sheets 4 has a through-hole 42 formed along the thickness direction of the plate. A first sealing ring S1 formed by the through-hole 42 allows induced currents generated by an external AC magnetic field to pass through, while a second sealing ring S2 surrounded by the sampling resistor sheet 4, the sampling pins 41, and the PCB board 2 cancels out the induced currents generated by the external AC magnetic field, thereby improving the relay's ability to prevent interference when measuring in an AC magnetic field. The present invention uses sampling resistive sheets 4 with two paths as a sampling circuit for measurement, and the sampling resistive sheets 4 with the same directional sampling pins 41 are directly inserted into the PCB board 2 and fixed by welding, thereby avoiding many of the drawbacks of connecting with signal lines in the prior art, and is characterized by low manufacturing costs, easy installation, and a high degree of automation. The present invention has the advantages that the through holes 42 of the sampling resistive sheet 4 are induced by an external AC magnetic field, and the second sealing ring surrounded by the sampling resistive sheet 4, the sampling pins 41, and the PCB board 2 cancels out the induced current generated by the external AC magnetic field, thereby reducing the influence of AC electromagnetic field interference on the measurement accuracy of manganese copper and improving the anti-interference ability of the relay when measuring in an AC magnetic field.

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

[0042] Furthermore, dual-path measurement relays used in conventional electronic watt-hour meters typically include a housing, a contact assembly within the housing, and a lead-out sheet connected to the corresponding contact assembly within the housing. Such dual-path measurement relays have four lead-out sheets, with each two lead-out sheets forming one path and connected to the corresponding contact assembly within the housing. One of the two lead-out sheets in each path is equipped with a measuring device, with one lead-out sheet in one path equipped with a manganese copper piece for measurement as a sampling circuit, and the other lead-out sheet in the other path equipped with a current transformer (CT) for measurement as a sampling circuit. This type of dual-path measurement relay with measurement modes in the conventional technology has the following main drawbacks: First, measurement along one of the paths requires the use of a current transformer, which increases the cost of the relay and impacts the product's competitiveness. 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 welding errors more likely to occur, increases labor costs, and reduces the degree of automation.

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

[0044] The technical solution used in the present invention to solve the technical problem is as follows: a dual-path measurement relay including a housing, a PCB board, and a lead-out sheet extending from within the housing to the outside of a first side of the housing and connected to a contact assembly within the housing, there are four lead-out sheets, each connected to a contact assembly in a corresponding path, and each lead-out sheet includes a plate-shaped sampling resistor sheet made of a high-resistivity material and conductive sheets 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 allow current to flow in and out, and 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 formed along the thickness direction of the plate body, 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, sampling pin, and PCB board cancels out the induced current generated by the external alternating magnetic field, thereby improving the relay's ability to prevent interference when 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 lead-out sheets are inserted into the PCB board on the same plane and connected by welding.

[0048] The two sampling pins on the same extraction sheet are connected to the upper surfaces of the corresponding sampling resistive sheets, respectively.

[0049] The two sampling pins on the same extraction sheet are connected to the upper surfaces of the corresponding conductive sheets, respectively.

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

[0051] The sampling pin further has a first boss at the connection point 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] 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.

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

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

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

[0056] The four pull-out sheets are arranged in order along the first side of the housing, and the two middle pull-out sheets are each 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 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 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 path of the circuit includes a lead-out sheet including a plate-shaped sampling resistor sheet made of a high-resistivity material, and the sampling resistor sheet is provided with two sampling pins extending in the same direction to allow current to flow in and out. 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 in the same direction are directly inserted into the PCB board and fixed by welding, thereby avoiding many of the drawbacks of connecting using signal lines in the prior art and offering the advantages of low manufacturing costs, easy installation, and a high degree of automation.

[0060] Furthermore, in the present invention, the two sampling resistive sheets each have a through hole formed along the thickness direction of the plate, so that the first sealing ring formed by the through hole allows the induced current generated by an external AC magnetic field to pass through, and the second sealing ring surrounded by the sampling resistive sheet, the sampling pin, and the PCB board to cancel out the induced current generated by the external AC magnetic field, thereby improving the relay's ability to prevent interference when measuring in an AC magnetic field.In the present invention, the through hole in the sampling resistive sheet allows the induced current generated by the external AC magnetic field to pass through, and the second sealing ring surrounded by the sampling resistive sheet, the sampling pin, and the PCB board to cancel out the induced current generated by the external AC magnetic field, thereby reducing the influence of AC electromagnetic fields on the accuracy of measurements using manganese copper and improving the relay's ability to prevent interference when measuring in an AC magnetic field.

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

[0062] Example 3 19 to 30, the dual-path measurement relay of the present invention includes a housing 1, a PCB board 2, and a lead-out sheet 3 extending from within the housing to the outside of a first side of the housing and connected to a contact assembly within the housing. There are four lead-out sheets 3, and the four lead-out sheets are arranged in order along the first side of the housing 1, i.e., lead-out sheet 33, lead-out sheet 31, lead-out sheet 32, and lead-out sheet 34 are arranged in order along the first side of the housing 1. The two intermediate lead-out sheets 31 and 32 are each connected to a contact assembly in one path within the housing by one edge of the first side of the housing, and one lead-out sheet 33 of the two lead-out sheets located on both sides makes a detour from the bottom of the housing to a point approaching the other lead-out sheet 34 and is connected to a contact assembly in the other path within the housing by the other edge of the first side of the housing. Of the two lead sheets 31 and 32, the lead sheet 31 includes a plate-shaped sampling resistive sheet 4 made of a high-resistivity material and a conductive sheet 6 connected to both ends of the sampling resistive sheet 4. Of the two lead sheets 33 and 34, the lead sheet 33 includes a plate-shaped sampling resistive sheet 4 made of a high-resistivity material and a conductive sheet 6 connected to both ends of the sampling resistive sheet 4. The structure of the sampling resistive sheet 4 will be specifically described below using the lead sheet 33 (as shown in Figures 11 and 12). The structure of the sampling resistive sheet 4 of the lead sheet 31 is the same as that of the lead sheet 33. The lead sheet 33 is an external lead sheet, and the lead sheet 33 is also accessed into the housing by an internal lead sheet 331 (not shown). Two sampling pins 41 extending in the same direction are provided at both ends of the sampling resistive sheet 4 to allow current to flow in and out.Sampling pins 41 at both ends of two sampling resistance sheets (i.e., the sampling resistance sheet 4 on the lead-out sheet 31 and the sampling resistance sheet 4 on 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 on the same sampling resistive sheet 4 are connected to the upper surfaces of the corresponding sampling resistive sheets 4 at both ends.

[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 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 connecting line between the two sampling pins 41 .

[0071] In this embodiment, the coil pins 5 are distributed on the top surface of the housing 1 near a second side of the housing that faces the first side of the housing 1, and second bosses 11 are further provided on both sides of the top surface of the housing 1 near the second side, and the height position of the top surface of the second bosses 11 is flush with the height position of the top surface of the first boss 43. The PCB board 2 is hung on the top surfaces of the first boss 43 and 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] In the dual-path measurement relay and electronic watt-hour meter of the present invention, each path has a lead-out sheet including a plate-shaped sampling resistive sheet 4 made of a high-resistivity material, and the sampling resistive sheet 4 has two sampling pins 41 extending in the same direction to allow current to flow in and out. The sampling pins 41 of each of the two lead-out sheets are inserted into the PCB board 2 and connected by welding. The present invention uses sampling resistive sheets for two paths as a sampling circuit for measurement, and the sampling resistive sheets for 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 associated with connection using signal lines in the prior art and offering the advantages of low manufacturing costs, easy installation, and a high degree of automation.

[0075] Example 4 31 to 35, the difference between the dual path measurement relay and its electronic watt-hour meter of the present invention and Example 3 is that the sampling resistive sheets 4 of the lead-out sheet 31 and the sampling resistive sheets 4 of the lead-out sheet 33 each have through holes 42 formed along the thickness direction of the plate, so that the first sealing ring S1 formed by these through holes 42 cancels out the induced current generated by the external alternating magnetic field, while the second sealing ring S2 surrounded by the sampling resistive sheets 4, sampling pins 41 and PCB board 2 cancels out the induced current generated by the external alternating magnetic field (as shown in FIG. 14), thereby improving the relay's ability to prevent interference when measuring in an alternating magnetic field. As can be seen from the law of electromagnetic induction,

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[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. Such variations and modifications are within the scope of the present invention. It should be understood that the invention disclosed and limited herein extends to all alternative combinations of two or more distinct features mentioned or illustrated in this specification and / or drawings. All of these different combinations constitute multiple alternative aspects of the invention. The embodiments described herein explain the most preferred modes known for carrying out the invention and will enable those skilled in the art to utilize the invention.

Claims

1. A dual path measurement relay including: a housing; a PCB board; and four lead-out sheets extending from within the housing to an exterior of a first side of the housing and connected to contact assemblies within the housing, wherein the lead-out sheets are four in number, and two lead-out sheets are connected to contact assemblies in a corresponding one of the paths, respectively; Each path has one lead-out sheet including a plate-shaped sampling resistance sheet made of a high resistivity material 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 allow current to flow in and out, 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.

2. The two sampling resistive sheets each have a through hole formed along the thickness direction of the plate body, 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, sampling pin, and PCB board cancels out the induced current generated by the external alternating magnetic field, thereby improving the interference prevention capability when the relay measures in an alternating magnetic field.

2. The dual path measurement relay according to claim 1.

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

2. The dual path measurement relay according to claim 1.

4. 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 lead sheets are inserted into the PCB board on the same plane and connected by welding.

4. The dual path measurement relay according to claim 3.

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

4. The dual path measurement relay according to claim 3.

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

4. The dual path measurement relay according to claim 3.

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

7. A dual-path measurement relay according to claim 5 or 6.

8. The sampling pin further has 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 top surface of the first boss.

5. The dual path measurement relay according to claim 4.

9. 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.

9. The dual path measurement relay according to claim 8.

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

3. The dual path measurement relay according to claim 2.

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

11. The dual path measurement relay of claim 10.

12. 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 second bosses are further provided on 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 surfaces of the first boss and the second boss.

9. The dual path measurement relay according to claim 8.

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

2. The dual path measurement relay according to claim 1.

14. An electronic watt-hour meter including the dual-path measurement relay according to any one of claims 1 to 6.

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