Metering type mutual inductor

Abstract

The utility model relates to a metering type mutual inductor which comprises a machine shell, a voltage collecting column, a mutual inductance mechanism, a main control mechanism and a base, a column cavity is formed in the front face of the machine shell, and a gland is arranged on the outer side of the column cavity. The column cavity comprises a cover groove and a column groove which are formed in sequence in an inward concave mode, the upper edge of the gland is hinged to the upper portion of the cover groove, and the voltage collecting column is arranged in the column groove. The lower part of the gland is provided with a U-shaped wire pressing port, and the lower edge of the gland is sleeved and fixedly pasted with an elastic rubber sealing edge. A heat dissipation aluminum sheet is arranged on the gland, and heat dissipation fins are arranged on the outer surface of the heat dissipation aluminum sheet; the voltage acquisition column comprises a contact column and a pressure head, the center of the contact column sinks inwards to form a groove, and the pressure head comprises a bolt with the lower portion matched with the groove. According to the metering type mutual inductor, the binding post is effectively protected, meanwhile, the penetrating phase line can be firmly clamped and fixed when the cover plate is closed, the metering type mutual inductor has heat conduction and heat dissipation functions, and convenient and stable wiring connection between the bare head of the phase line and the binding post is achieved.

Description

Technical Field

[0001] The utility model relates to the field of electrical measurement equipment, and particularly relates to a metering transformer. Background Art

[0002] A voltage transformer is an electrical measurement device that measures the line voltage through the induction of primary and secondary winding coils. The primary winding is connected to the cable phase wire, and the secondary winding is connected to the meter head after mutual induction with the primary winding. Voltage transformers for metering all have phase wire contacts and meter head contacts for connecting the cable phase wire to be measured and the metering meter head respectively. Existing voltage transformers generally have problems such as the connection of the meter head affecting the detection efficiency, the exposed contacts being prone to malfunction or causing internal coil failures. Chinese Patent CN217361347U discloses a voltage transformer, which accommodates and encloses the terminal post in the column groove through the design of the concave column groove and the sliding cover plate. However, when implementing this technical solution to form a product, its structure has the following problems:

[0003] (1) For the sliding cover plate up and down, when it moves downward, it cannot effectively clamp and fix the introduced phase wire.

[0004] (2) The operation of connecting the phase wire head to the terminal post is inconvenient, and the upward-sliding cover plate will naturally fall and hinder the wiring operation.

[0005] (3) The exposed joint at the column groove wiring is energized and heated, resulting in too high a temperature in the enclosed space where the wiring position is located.

[0006] (4) The fixing method of winding the phase wire head around the terminal post has an unstable connection and is prone to virtual connection or detachment. Content of the Utility Model

[0007] The technical problem to be solved by the utility model is to overcome the defects that the connection of the meter head of the existing voltage transformer affects the detection efficiency and the exposed contacts lead to a high failure rate, as well as the problems generated by the structure design of the cover plate and the terminal post in the actual product application of the existing technology. A metering transformer is provided, which can effectively protect the terminal post while improving the cover plate structure, the fixing method, the slot structure, and the wiring fixing structure of the terminal post protection structure, so that when the cover plate is closed, it can firmly clamp and fix the penetrated phase wire, has a heat conduction and heat dissipation function, and also realizes a convenient and stable wiring connection between the bare head of the phase wire and the terminal post.

[0008] This metering current transformer includes a casing, a voltage acquisition column arranged on the casing, a mutual inductance mechanism arranged inside the casing, a main control mechanism arranged above the casing, and a base arranged below the casing. The voltage acquisition column is connected to the input end of the mutual inductance mechanism, and the output end of the mutual inductance mechanism is connected to the input end of the main control mechanism. Among them, the casing is in the shape of a regular octagonal cylinder. There are three column cavities for accommodating the voltage acquisition column on the front of the casing, and gland plates for covering the column cavities are arranged outside the column cavities. The column cavity includes a cover groove and a column groove formed by the stepped concave of the casing in sequence. The upper edge of the gland plate is hinged to the upper part of the cover groove, and the voltage acquisition column is arranged in the column groove. The lower part of the gland plate is provided with a U-shaped wire pressing opening, and an elastic rubber sealing edge is wrapped and fixedly pasted on the lower edge of the gland plate. Heat dissipation aluminum sheets are arranged on the gland plate, and heat dissipation fins are arranged on the outer surface of the heat dissipation aluminum sheets. The voltage acquisition column includes a copper contact column and a pressure head fixed on the bottom surface of the cover groove. A groove is formed by the central indentation of the contact column, and the pressure head includes a copper plug that matches the groove below.

[0009] Further, an insulating plastic pin handle is fixed on the upper part of the plug.

[0010] Further, an arc-shaped wire receiving groove extending to the contact column is formed at the bottom of the column groove.

[0011] Further, a handle is arranged above the casing.

[0012] Specifically, the mutual inductance mechanism includes a primary winding and a secondary winding. The head end of the primary winding is connected to the voltage acquisition column, and the tail end of the primary winding is left suspended after connection. The head end of the secondary winding is connected to the input end of the main control mechanism, and the tail end of the secondary winding is grounded after connection.

[0013] A metering current transformer of the present utility model overcomes the defects that the connection of the existing voltage transformer meter head affects the detection efficiency and the exposed contacts lead to high failure rates, as well as the problems generated by the existing technical cover plate and wiring column structure designs in actual product applications. While effectively protecting the wiring column, it improves through the cover plate structure and fixing method, the groove structure, and the wiring fixing structure of the wiring column protection structure, enabling the cover plate to firmly clamp and fix the incoming phase wire when closed, having a heat conduction and heat dissipation function, and also realizing a convenient and stable wiring connection between the bare head of the phase wire and the wiring column. Description of the Drawings

[0014] The following further describes a metering current transformer of the present utility model in conjunction with the drawings:

[0015] Figure 1 It is the front view plane structure schematic diagram of Embodiments 1 and 2;

[0016] Figure 2 It is the front upper view three-dimensional structure schematic diagram of Embodiments 1 and 2;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure in the front lower view direction of Embodiments 1 and 2;

[0018] Figure 4 It is a block diagram of the logical structure connection lines of the mutual inductance mechanism and the main control mechanism of Embodiment 3.

[0019] In the figure:

[0020] 1 - housing, 2 - voltage acquisition column, 3 - mutual inductance mechanism, 4 - main control mechanism, 5 - base;

[0021] 11 - column cavity, 12 - gland, 13 - handle; 21 - contact post, 22 - pressure head; 31 - primary winding, 32 - secondary winding 32;

[0022] 111 - cover groove, 112 - column groove, 113 - wire groove; 121 - wire pressing port, 122 - rubber sealing edge, 123 - heat dissipation aluminum sheet, 124 - heat dissipation fin; 211 - groove, 221 - plug, 222 - plug handle. Specific embodiments

[0023] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left", "right", "front", "rear", "top", "bottom", "inside", "outside" and the like are all based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0025] The following further describes the technical solution of the present utility model with specific embodiments, but the protection scope of the present utility model is not limited to the following embodiments.

[0026] Embodiment 1: As Figures 1 to 3As shown in the figure, this metering type current transformer includes a casing 1, a voltage acquisition column 2 arranged on the casing 1, a mutual inductance mechanism 3 arranged inside the casing 1, a main control mechanism 4 arranged above the casing 1, and a base 5 arranged below the casing 1. The voltage acquisition column 2 is connected to the input end of the mutual inductance mechanism 3, and the output end of the mutual inductance mechanism 3 is connected to the input end of the main control mechanism 4. Among them, the casing 1 is in the shape of a regular octagonal cylinder. There are three column cavities 11 for accommodating the voltage acquisition column 2 on the front of the casing 1, and a gland 12 for covering the column cavity is arranged outside the column cavity 11. The column cavity 11 includes a cover groove 111 and a column groove 112 formed by the stepped inward recess of the casing 1 in sequence. The upper edge of the gland 12 is hinged to the upper part of the cover groove 111, and the voltage acquisition column 2 is arranged in the column groove 112. A U-shaped wire pressing port 121 is arranged at the lower part of the gland 12, and an elastic rubber sealing edge 122 is wrapped and fixedly pasted on the lower edge of the gland 12. A heat dissipation aluminum sheet 123 is arranged on the gland 12, and heat dissipation fins 124 are arranged on the outer surface of the heat dissipation aluminum sheet 123. The voltage acquisition column 2 includes a copper contact column 21 fixed on the bottom surface of the cover groove 111 and a pressure head 22. A groove 211 is formed by the inward depression in the center of the contact column 21. The pressure head 22 includes a copper plug 221 that matches the groove 211 below.

[0027] Embodiment 2: In this metering type current transformer, an insulating plastic pin handle 222 is fixed on the upper part of the plug 221. It is used to press the small handle down into the groove to complete convenient and fast wiring, and the operation is convenient and safe. An arc-shaped wire receiving groove 113 extending to the contact column 21 is formed at the bottom of the column groove 112. It is used to introduce the bare head of the phase wire to the contact column, and support and position the lower edge of the phase wire when closing the box cover to prevent displacement. A handle 13 is arranged above the casing 1. It is convenient for carrying and transferring.

[0028] Embodiment 3: As Figure 4As shown in the figure, the mutual inductance mechanism 3 of the metering type mutual inductor includes a primary winding 31 and a secondary winding 32; the head end of the primary winding 31 is connected to the voltage acquisition column 2, and the tail end of the primary winding 31 is suspended after connection; the head end of the secondary winding 32 is connected to the input end of the main control mechanism 4, and the tail end of the secondary winding 32 is grounded after connection. The main control mechanism 4 includes a signal processing unit, a processing chip, a wireless data transmission module, a display screen and a power supply module. The signal processing unit includes a filtering module, a signal amplification module and an A / D conversion module. The filtering module of the signal processing unit is connected to the head end of the secondary winding, and the output end of the filtering module is connected to the input end of the processing chip through the signal amplification module and the A / D conversion module. The processing chip is connected to the wireless data transmission module and the display screen through serial port communication. A signal gain antenna is integrated on the wireless data transmission module. The power supply module supplies DC 3.3V / 5V to the processing chip, the wireless data transmission module and the display screen respectively. In this embodiment, the mutual inductance winding and the control mechanism of the existing technology are used for design, which will not be elaborated here. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0029] During use: Lift the gland. The gland hovers under the damping action of the rubber shaft. Guide the ABC phase wires of the cable to be measured into the column grooves of the contact posts along the grooves respectively. Hold the insulating pin handle of the pressure post and insert the plug pin into the column groove of the contact post for connection. Flip down and fasten the gland. The gland firmly presses the phase wires through the elastic rubber seal on the wire pressing port. At the same time, the rubber seals extending from both sides of the wire pressing port of the gland squeeze the lower part and the side wall edge of the gland groove, playing a role in preventing the gland from retreating and preventing it from flipping up to open the cover. To open the cover again, use a flat-blade screwdriver to pry it open from the position without rubber seal on the side of the gland. The subsequent operation process is as recorded in the existing technology: The secondary winding mutually inducts the voltage of the primary winding to form an analog signal. The signal processing unit filters, amplifies and performs analog-to-digital conversion on the analog signal and then sends it to the processing chip. The processing chip outputs to the display screen on one hand and sends it to a remote mobile device or the background through the wireless data transmission module on the other hand.

[0030] This metering type mutual inductor overcomes the defects of the existing voltage transformer head connection affecting the detection efficiency and the high failure rate caused by the exposed contacts, as well as the problems generated by the existing technology in the design of the cover plate and the terminal structure in the actual product application. While effectively protecting the terminal post, it improves through the cover plate structure and fixing method, the capacitance groove structure, and the wiring fixing structure of the terminal post protection structure, enabling the cover plate to firmly clamp and fix the penetrated phase wires when closed, having a heat conduction and heat dissipation function, and also realizing a convenient and stable wiring connection between the bare head of the phase wire and the terminal post.

[0031] The above description shows the main features, basic principles, and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments or examples, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, the above-described embodiments or examples should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0032] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A metering transformer, characterized in that: The invention comprises a housing (1), a voltage collection column (2) arranged on the housing (1), a mutual inductance mechanism (3) arranged in the housing (1), a main control mechanism (4) arranged above the housing (1), and a base (5) arranged below the housing (1), wherein the voltage collection column (2) is connected to the input end of the mutual inductance mechanism (3), and the output end of the mutual inductance mechanism (3) is connected to the input end of the main control mechanism (4), wherein the housing (1) is in the shape of a regular octagonal cylinder, and three column cavities (11) for accommodating the voltage collection columns (2) are arranged on the front of the housing (1), and a pressure cover (12) for sealing the column cavities is arranged on the outside of the column cavities (11); The column cavity (11) comprises a cover groove (111) and a column groove (112) which are sequentially formed by step-like indentations of the housing (1); the upper edge of the pressure cover (12) is hinged to the upper part of the cover groove (111); the voltage collection column (2) is arranged in the column groove (112); a U-shaped pressing line opening (121) is arranged at the lower part of the pressure cover (12); an elastic rubber sealing edge (122) is wrapped and fixedly attached to the lower edge of the pressure cover (12); a heat dissipation aluminum sheet (123) is arranged on the pressure cover (12), and a heat dissipation fin (124) is arranged on the outer surface of the heat dissipation aluminum sheet (123); the voltage collection column (2) comprises a copper contact column (21) and a pressure head (22) fixed on the bottom surface of the cover groove (111); the center of the contact column (21) is indented to form a groove (211); the pressure head (22) comprises a copper plug (221) at the lower part matching the groove (211).

2. The metering transformer according to claim 1 is characterized in that: An insulating plastic pin handle (222) is fixed on the upper part of the latch pin (221).

3. The metering transformer according to claim 2 is characterized in that: An arc-shaped wire receiving groove (113) extending to the contact column (21) is formed at the bottom of the column groove (112).

4. The metering transformer according to claim 3 is characterized in that: A handle (13) is provided on the upper side of the casing (1).

5. The metering transformer according to claim 4 is characterized in that: The mutual inductance mechanism (3) comprises a primary winding (31) and a secondary winding (32); the head end of the primary winding (31) is connected to the voltage collection column (2), and the tail end of the primary winding (31) is connected and then suspended; the head end of the secondary winding (32) is connected to the input end of the main control mechanism (4), and the tail end of the secondary winding (32) is connected and then grounded.

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