A measurable electromagnetic relay and its electronic electric energy meter

Abstract

The present invention discloses a meterable electromagnetic relay and an electronic energy meter thereof. The meterable electromagnetic relay comprises a housing, a PCB, and two lead-out plates extending from the inside of the housing toward one side of the housing and connected to a contact assembly within the housing. One of the two lead-out plates comprises a plate-shaped sampling resistor made of a high-resistivity material and a conductive plate connected to both ends of the sampling resistor. The sampling resistor is provided with two sampling pins extending in the same direction. The PCB is connected to the two sampling pins of the sampling resistor by plugging and welding. A through hole is provided in the sampling resistor along the thickness direction of the plate. The present invention utilizes the induced current generated in an external alternating magnetic field by a first closed loop formed by the through hole to offset the induced current generated in an external alternating magnetic field by a second closed loop formed by the sampling resistor, the sampling pin, and the PCB, thereby improving the relay's anti-interference capability in alternating magnetic field measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic instruments, in particular to a measurable electromagnetic relay and an electronic electric energy meter thereof. Background Art

[0002] An electronic energy meter is an electronic instrument that samples the user's power supply voltage and current in real time. Using a dedicated energy meter integrated circuit, it processes the sampled voltage and current signals, multiplies them, and converts them into pulse outputs proportional to the electrical energy, which is then displayed on a meter or digital display. Electronic energy meters typically use relays to control the load circuit. As an electronic control device, a relay has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. It is essentially an "automatic switch" that uses a smaller current to control a larger current. It performs functions such as automatic regulation, safety protection, and circuit conversion within the circuit. A measurable electromagnetic relay for an electronic electric energy meter in the prior art generally includes a housing, a contact assembly within the housing, and two lead plates connected to the contact assembly within the housing. One of the two lead plates is provided with a manganese copper plate as a metering device. The manganese copper plate is provided with a sampling pin and is connected to a PCB board via a signal line. On the one hand, this type of relay requires a welding process due to the use of signal lines for connection, resulting in complex processes, high production costs, and a low degree of automation. On the other hand, external magnetic field interference will cause a reduction in metering accuracy.

[0003] In addition, a measurable electromagnetic relay for an electronic electric energy meter in the prior art adopts two-way metering. This two-way metering relay is provided with four lead-out plates, and each two lead-out plates form one channel and are respectively connected to the corresponding contact assembly of one channel. In the two lead-out plates, one of the two lead-out plates of each channel is provided with a metering device, and one lead-out plate of one channel is provided with a manganese copper sheet as a sampling circuit for metering, and one lead-out plate of the other channel is equipped with a current transformer as a sampling circuit for metering. The two-way metering relay of this metering mode in the prior art mainly has the following disadvantages: First, since the current transformer is used for the measurement of one channel, the cost of the relay is relatively high, which affects the competitiveness of the product; second, the manganese copper sheet and the current transformer are both connected by signal lines, and the coil lead-out is also connected by signal lines, resulting in complex production processes, multiple signal lines that are easy to be welded incorrectly, high labor costs, and low degree of automation. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a measurable electromagnetic relay and an electronic electric energy meter thereof. Through structural improvement, on the one hand, the relay's anti-interference ability in alternating magnetic field measurement can be improved; on the other hand, many disadvantages caused by signal line connection can be avoided, and the invention has the characteristics of low production cost, easy installation and high degree of automation.

[0005] The present invention solves the technical problem by adopting a technical solution: a meterable electromagnetic relay comprising a housing, a PCB, and two lead plates extending from the housing toward one side thereof and connected to a contact assembly within the housing; one of the two lead plates comprises a plate-shaped sampling resistor made of a high-resistivity material and conductive plates connected to both ends of the sampling resistor; two sampling pins extending in the same direction are provided at both ends of the sampling resistor for enabling current inflow and outflow; the PCB is connected to the sampling pins of the two sampling resistors by plugging and welding, respectively; and a through hole is provided in the sampling resistor along the thickness direction of the plate, so that the induced current generated in a first closed loop formed by the through hole in an external alternating magnetic field can offset the induced current generated in a second closed loop formed by the sampling resistor, the sampling pin, and the PCB in the external alternating magnetic field, thereby improving the relay's anti-interference capability in alternating magnetic field measurement.

[0006] The area of the first closed loop is set to be the same as the area of the second closed loop, so that the induced current generated by the first closed loop formed by the through hole in the external alternating magnetic field can be used to completely offset the induced current generated by the second closed loop surrounded by the sampling resistor, sampling pin and PCB board in the external alternating magnetic field.

[0007] There are two lead-out pieces extending from the inside of the housing to one side of the housing and connected to the contact assembly in the housing. There is one contact assembly in the housing. One of the two lead-out pieces includes the sampling resistor.

[0008] There are four lead-out pieces extending from the inside of the housing to one side of the housing and connected to the contact assembly in the housing. The contact assembly in the housing is two-way. Among the four lead-out pieces, every two lead-out pieces are respectively connected to a corresponding contact assembly in one way. In each way of lead-out pieces, one lead-out piece includes the sampling resistor.

[0009] The PCB board is connected to the sampling pins of the sampling resistor on the same plane by plugging and welding.

[0010] The housing is further provided with a coil lead-out pin extending from the housing. The coil lead-out pin and the sampling pin of the sampling resistor are respectively connected to the PCB board by plugging and welding on the same plane.

[0011] The two sampling pins in the same sampling resistor are respectively connected to the top surfaces of the ends of the corresponding sampling resistor.

[0012] The two sampling pins in the same sampling resistor are respectively connected to the top surfaces of the conductive sheets outside the ends of the corresponding sampling resistor.

[0013] Each sampling pin in the sampling resistor is configured as a pin-type structure.

[0014] The sampling pin is provided with a first boss at the connection with the corresponding sampling resistor, and the cross section of the first boss is larger than the cross section of the sampling pin. The PCB board is placed on the top surface of the first boss.

[0015] In the sampling foot, a solder layer is coated on the outer surface of a portion corresponding to the upper surface of the first boss.

[0016] The through hole of the sampling resistor is located on a vertical line of the midpoint of the line connecting the two sampling pins.

[0017] The coil lead-out pins are distributed on the top surface of the shell near the other side of the shell opposite to the one side of the shell, and second bosses are respectively provided on both sides of the top surface of the shell near the other side of the shell, 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; the PCB board is placed on the top surface of the first boss and the top surface of the second boss.

[0018] The four lead-out pieces are arranged sequentially along one side of the shell, wherein the two lead-out pieces in the middle are respectively connected to a contact assembly in the shell from one side of the shell, and one of the two lead-out pieces on both sides is connected from the bottom of the shell to a position close to the other lead-out piece and is connected to another contact assembly in the shell from the other side of the shell.

[0019] The sampling resistor is a manganese copper sheet or a constantan sheet.

[0020] An electronic electric energy meter comprises the above-mentioned measurable electromagnetic relay.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention utilizes a through hole provided along the thickness of the sampling resistor to utilize the induced current generated in the first closed loop formed by the through hole in an external alternating magnetic field to offset the induced current generated in the second closed loop formed by the sampling resistor, sampling pin, and PCB board in an external alternating magnetic field, thereby improving the relay's ability to resist interference in alternating magnetic field measurement. This structure utilizes the induced current generated in the through hole of the sampling resistor in an external alternating magnetic field to offset the induced current generated in the second closed loop formed by the sampling resistor, sampling pin, and PCB board in an external alternating magnetic field. This reduces the impact of alternating electromagnetic fields on manganese-copper metering accuracy and improves the relay's ability to resist interference in alternating magnetic field measurement.

[0023] 2. The present invention adopts the method of using four lead-out pieces, in which every two lead-out pieces are respectively connected to a corresponding contact assembly; in each lead-out piece, there is a lead-out piece including a plate-type sampling resistor made of a high-resistivity material and a conductive piece connected to both ends of the sampling resistor. In this structure of the present invention, the two lead-out pieces used to implement sampling respectively adopt sampling resistors, and the sampling pins of the two sampling resistors are respectively connected to the PCB board by plugging and welding. In this structure of the present invention, two sampling resistors are used as sampling circuits for measurement, and the two sampling resistors are provided with sampling pins in the same direction and are directly plugged and welded to the PCB board for fixation, thereby avoiding many disadvantages caused by the signal line connection of the prior art, and having the characteristics of low production cost, easy installation, and high degree of automation.

[0024] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments; however, the quantifiable electromagnetic relay and the electronic energy meter thereof of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a schematic diagram of the three-dimensional structure of a measurable electromagnetic relay according to the first embodiment of the present invention;

[0026] Figure 2 1 is a front view of a measurable electromagnetic relay according to a first embodiment of the present invention;

[0027] Figure 3 is a top view of a measurable electromagnetic relay according to a first embodiment of the present invention;

[0028] Figure 4 1 is a left side view of a measurable electromagnetic relay according to a first embodiment of the present invention;

[0029] Figure 5 It is a right side view of the measurable electromagnetic relay according to the first embodiment of the present invention;

[0030] Figure 6 yes Figure 2 A magnified schematic diagram of part A in FIG;

[0031] Figure 7 1 is a schematic diagram of the three-dimensional structure of a measurable electromagnetic relay (without a PCB board) according to the first embodiment of the present invention;

[0032] Figure 8 1 is a front view of a measurable electromagnetic relay (without a PCB board) according to a first embodiment of the present invention;

[0033] Figure 9 1 is a top view of a measurable electromagnetic relay (without a PCB board) according to a first embodiment of the present invention;

[0034] Figure 10 1 is a left side view of a measurable electromagnetic relay (without a PCB board) according to a first embodiment of the present invention;

[0035] Figure 11 1 is a right side view of the quantifiable electromagnetic relay (without the PCB board installed) according to the first embodiment of the present invention;

[0036] Figure 12 1 is a schematic diagram of the three-dimensional structure of one of the lead-out pieces of the quantifiable electromagnetic relay according to the first embodiment of the present invention;

[0037] Figure 13 This is a front view of one of the lead-out pieces of the quantifiable electromagnetic relay according to the first embodiment of the present invention;

[0038] Figure 14 1 is a schematic diagram of the three-dimensional structure of a quantifiable electromagnetic relay (without a PCB board) according to a second embodiment of the present invention;

[0039] Figure 15 1. This is a front view of a quantifiable electromagnetic relay (without a PCB board) according to a second embodiment of the present invention;

[0040] Figure 16 1 is a top view of a measurable electromagnetic relay (without a PCB board) according to a first embodiment of the present invention;

[0041] Figure 17 1 is a rear view of the quantifiable electromagnetic relay (without a PCB board installed) according to the first embodiment of the present invention;

[0042] Figure 18 It is a schematic diagram of the three-dimensional structure of the measurable electromagnetic relay (without a PCB board and rotated at an angle) according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0043] Example

[0044] See also Figures 1 to 13As shown, a meterable electromagnetic relay of the present invention is a two-way metering electromagnetic relay, which includes a housing 1, a PCB board 2, and a lead piece 3 extending from the inside of the housing to one side of the housing and connected to the contact assembly in the housing, wherein the lead pieces 3 are four, and the four lead pieces are arranged in sequence along one side of the housing 1, that is, the lead piece 33, the lead piece 31, the lead piece 32, and the lead piece 34 are arranged in sequence along one side of the housing 1, wherein the two lead pieces 31 and 32 in the middle are respectively connected to one contact assembly in the housing by one side of the housing, and the lead pieces on both sides are connected to the contact assembly in the housing. One of the two lead-out pieces 33 is wound around from the bottom of the housing to a position close to the other lead-out piece 34 and is connected to another contact assembly in the housing by the other side of the housing; among the lead-out pieces 31 and 32, the lead-out piece 31 includes a plate-type sampling resistor 4 made of a high-resistivity material and a conductive piece 6 connected to both ends of the sampling resistor 4. Among the lead-out pieces 33 and 34, the lead-out piece 33 includes a plate-type sampling resistor 4 made of a high-resistivity material and a conductive piece 6 connected to both ends of the sampling resistor 4. The lead-out piece 33 (as shown in FIG. 2 ) is referred to below. Figure 12 、 Figure 13 The structure of the sampling resistor 4 is specifically described as shown in FIG. The structure of the sampling resistor 4 of the lead sheet 31 is the same as that of the sampling resistor 4 of the lead sheet 33. It is worth noting that the lead sheet 33 is an external lead sheet and is also connected to the housing through the internal lead sheet 331. Two sampling pins 41 extending in the same direction are provided at both ends of the sampling resistor 4 for realizing the inflow and outflow of current. The PCB board 2 is respectively connected to the sampling pins 41 at both ends of the two sampling resistors (i.e., the sampling resistor 4 of the lead sheet 31 and the sampling resistor 4 of the lead sheet 33) by plugging and welding. A through hole 42 is provided in each of the two sampling resistors 4 along the thickness direction of the board body so that the induced current generated in the external alternating magnetic field by the first closed loop S1 formed by the through hole 42 can offset the induced current generated in the external alternating magnetic field by the second closed loop S2 surrounded by the sampling resistor 4, the sampling pin 41 and the PCB board 2 (as shown in FIG. Figure 6 As shown in the figure), the relay can improve its anti-interference ability in alternating magnetic field measurement. According to the law of electromagnetic induction: φ = B * S, where φ is the magnetic flux passing through the closed loop, t is time, B is the magnetic induction intensity, and S is the area perpendicular to the magnetic field. When the area of the first closed loop S1 formed by the through hole 42 is set to the area of the second closed loop S2 surrounded by the sampling resistor 4, the sampling pin 41, and the PCB board 2, external magnetic interference can be completely offset.

[0045] In this embodiment, the two sampling pins 41 in the same sampling resistor are respectively connected to the top surfaces of the ends of the corresponding sampling resistor 4 .

[0046] Of course, the two sampling pins in the same sampling resistor can also be connected to the top surfaces of the conductive sheets outside the two ends of the corresponding sampling resistor.

[0047] In this embodiment, the PCB board 2 is connected to the sampling pins 41 of the two sampling resistors 4 on the same plane by plugging and welding.

[0048] In this embodiment, the housing 1 is further provided with a coil lead pin 5 extending from the housing. The coil lead pin 5 and the sampling pins 41 of the two sampling resistors 4 are respectively connected to the PCB board 2 by plugging and welding on the same plane.

[0049] In this embodiment, each sampling pin 41 of the two sampling resistors 4 is configured as a pin-type structure.

[0050] In this embodiment, the sampling pin 41 is further provided with a first boss 43 at the connection point with the corresponding sampling resistor 4 , and the cross section of the first boss 43 is larger than the cross section of the sampling pin 41 . The PCB board 2 is placed on the top surface of the first boss 43 .

[0051] In this embodiment, a solder layer 44 is coated on the outer surface of a portion of the sampling pin 41 corresponding to the upper surface of the first boss 43 .

[0052] In this embodiment, the through hole 42 of the sampling resistor 4 is located on a vertical line of the midpoint of the line connecting the two sampling pins 41 .

[0053] In this embodiment, the coil lead-out pins 5 are distributed on the top surface of the shell near the other side of the shell opposite to the one side of the shell 1, and second bosses 11 are respectively provided on both sides of the top surface of the shell near the other side of the shell 1, and the height position of the top surface of the second boss 11 is flush with the height position of the top surface of the first boss 43; the PCB board 2 is placed on the top surface of the first boss 43 and the top surface of the second boss 11.

[0054] In this embodiment, the sampling resistor 4 is a manganese copper sheet.

[0055] An electronic electric energy meter of the present invention includes the two-way metering relays as described above.

[0056] A meterable electromagnetic relay and electronic energy meter thereof employ, in each lead-out section, a lead-out section including a plate-shaped sampling resistor 4 made of a high-resistivity material. The sampling resistor 4 is provided with two sampling pins 41 extending in the same direction for enabling current inflow and outflow. The PCB 2 is connected to the sampling pins 41 of the two sampling resistors 4 by plugging and welding. Each of the two sampling resistors 4 is provided with a through hole 42 along the thickness of the board. The induced current generated in an external alternating magnetic field by a first closed loop S1 formed by the through hole 42 offsets the induced current generated in an external alternating magnetic field by a second closed loop S2 formed by the sampling resistor 4, the sampling pin 41, and the PCB 2, thereby improving the relay's anti-interference capability in alternating magnetic field measurement. The present invention utilizes two sampling resistors 4 as a sampling circuit for metering, and the two sampling resistors 4 are provided with sampling pins 41 in the same direction and are directly plugged and welded to the PCB board 2, thereby avoiding many disadvantages caused by the signal line connection of the prior art. The present invention has the characteristics of low manufacturing cost, easy installation, and high degree of automation. The present invention utilizes the induced current generated by the through hole 42 of the sampling resistor 4 in the external alternating magnetic field to offset the induced current generated by the second closed loop surrounded by the sampling resistor 4, the sampling pin 41 and the PCB board 2 in the external alternating magnetic field. This can reduce the influence of the alternating electromagnetic field on the manganese copper metering accuracy and improve the anti-interference ability of the relay in alternating magnetic field metering.

[0057] Example

[0058] See also Figures 1 to 13 As shown, a meterable electromagnetic relay and electronic energy meter of the present invention differ from the first embodiment in that the electromagnetic relay is a one-way metering electromagnetic relay with only two lead-out tabs 33 and 34. Of the two lead-out tabs 33 and 34, lead-out tab 33 comprises a plate-type sampling resistor 4 made of a high-resistivity material. Another difference from the first embodiment is that the top surface of the housing lacks the second boss 11. Instead, a third boss 12 is provided at the location of the coil lead-out pin 5. The PCB 2 rests on the top surfaces of the first boss 43 and the third boss 12.

[0059] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A meterable electromagnetic relay comprising a housing, a PCB, and two lead-out plates extending from the housing toward one side thereof and connected to a contact assembly within the housing; one of the two lead-out plates comprises a plate-shaped sampling resistor made of a high-resistivity material and conductive plates connected to both ends of the sampling resistor; two sampling pins extending in the same direction are provided at both ends of the sampling resistor for enabling current inflow and outflow; the PCB is connected to the two sampling pins of the sampling resistor by plugging and welding; and the relay is characterized in that: The sampling resistor is provided with a through hole along the thickness of the plate body. The induced current generated in the external alternating magnetic field by the first closed loop formed by the through hole is used to offset the induced current generated in the external alternating magnetic field by the second closed loop surrounded by the sampling resistor, sampling pin and PCB board, thereby improving the relay's anti-interference ability in alternating magnetic field measurement.

2. The quantifiable electromagnetic relay according to claim 1, characterized in that: The area of the first closed loop is set to be the same as the area of the second closed loop, so that the induced current generated by the first closed loop formed by the through hole in the external alternating magnetic field can be used to completely offset the induced current generated by the second closed loop surrounded by the sampling resistor, sampling pin and PCB board in the external alternating magnetic field.

3. The quantifiable electromagnetic relay according to claim 1 or 2, characterized in that: There are two lead-out pieces extending from the inside of the housing to one side of the housing and connected to the contact assembly in the housing. There is one contact assembly in the housing. One of the two lead-out pieces includes the sampling resistor.

4. The quantifiable electromagnetic relay according to claim 1 or 2, characterized in that: There are four lead-out pieces extending from the inside of the housing to one side of the housing and connected to the contact assembly in the housing. The contact assembly in the housing is two-way. Among the four lead-out pieces, every two lead-out pieces are respectively connected to a corresponding contact assembly in one way. In each way of lead-out pieces, one lead-out piece includes the sampling resistor.

5. The quantifiable electromagnetic relay according to claim 1 or 2, characterized in that: The PCB board is connected to the sampling pins of the sampling resistor on the same plane by plugging and welding.

6. The quantifiable electromagnetic relay according to claim 5, characterized in that: The housing is further provided with a coil lead-out pin extending from the housing. The coil lead-out pin and the sampling pin of the sampling resistor are respectively connected to the PCB board by plugging and welding on the same plane.

7. The quantifiable electromagnetic relay according to claim 5, characterized in that: The two sampling pins in the same sampling resistor are respectively connected to the top surfaces of the ends of the corresponding sampling resistor.

8. The quantifiable electromagnetic relay according to claim 5, characterized in that: The two sampling pins in the same sampling resistor are respectively connected to the top surfaces of the conductive sheets outside the ends of the corresponding sampling resistor.

9. The quantifiable electromagnetic relay according to claim 7 or 8, characterized in that: Each sampling pin in the sampling resistor is configured as a pin-type structure.

10. The quantifiable electromagnetic relay according to claim 6, characterized in that: The sampling pin is provided with a first boss at the connection with the corresponding sampling resistor, and the cross section of the first boss is larger than the cross section of the sampling pin. The PCB board is placed on the top surface of the first boss.

11. The quantifiable electromagnetic relay according to claim 10, characterized in that: In the sampling foot, a solder layer is coated on the outer surface of a portion corresponding to the upper surface of the first boss.

12. The quantifiable electromagnetic relay according to claim 1 or 2, characterized in that: The through hole of the sampling resistor is located on a vertical line of the midpoint of the line connecting the two sampling pins.

13. The quantifiable electromagnetic relay according to claim 10, characterized in that: The coil lead-out pins are distributed on the top surface of the shell near the other side of the shell opposite to the one side of the shell, and second bosses are respectively provided on both sides of the top surface of the shell near the other side of the shell, 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; the PCB board is placed on the top surface of the first boss and the top surface of the second boss.

14. The quantifiable electromagnetic relay according to claim 4, characterized in that: The four lead-out pieces are arranged sequentially along one side of the shell, wherein the two lead-out pieces in the middle are respectively connected to a contact assembly in the shell from one side of the shell, and one of the two lead-out pieces on both sides is connected from the bottom of the shell to a position close to the other lead-out piece and is connected to another contact assembly in the shell from the other side of the shell.

15. The quantifiable electromagnetic relay according to claim 1, characterized in that: The sampling resistor is a manganese copper sheet or a constantan sheet.

16. An electronic electric energy meter, characterized in that: The invention comprises a quantifiable electromagnetic relay as claimed in any one of claims 1 to 15.

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