Current measuring device

Abstract

The utility model provides a current measuring device, which includes a measuring part, a user interface and an electric drive device. The measuring part includes a first iron core, a second iron core, a coil and a fixing part. The second iron core and the first iron core jointly define a measuring space, and a wire can pass through the measuring space. The second iron core can move relative to the first iron core. When the current passing through the wire changes, the magnetic field in the first iron core and / or the second iron core changes. The coil is wound on the first iron core and / or the second iron core, and when the magnetic field in the first iron core and / or the second iron core changes, current is induced in the coil. The fixing part is used to fix the wire. The electric drive device is electrically connected to the user interface, and when the user operates the user interface, the second iron core is driven to move relative to the first iron core to close or open the measuring space. The embodiments of the utility model can simplify the operation process of the current measuring device and improve the accuracy of current measurement.

Description

Technical Field

[0001] The utility model generally relates to the technical field of measuring equipment, in particular to a current measuring device and a current measuring method. Background Art

[0002] When measuring the current in a wire, since the wire cannot be cut off, the current in the wire is usually measured using the principle of electromagnetic induction. Current measurement equipment usually needs to be provided with an openable and closable measurement space so that the wire whose current needs to be measured can be placed in the measurement space and released from the measurement space after the measurement is completed.

[0003] In existing current measurement devices, the process of switching the measurement space between the closed state and the open state is cumbersome and laborious. When measuring the current in the wire, some current measurement devices also need to manually keep the measurement space open, and manually control the measurement space to close after the measured wire is placed in the measurement space. At the same time, manually controlling the current measurement device may cause the measurement space to be loosely closed, such as the two ends of the detachable parts of the current measurement device being loosely connected, and the magnetic field generated in the current measurement device being unstable, affecting the accuracy of the current measurement data.

[0004] In addition, in existing current measurement equipment, when the measurement space is closed, the measurement space is often much larger than the cross-section of the measured conductor, resulting in the measured conductor being able to move arbitrarily in the measurement space. Such movement will bring obvious errors to high-precision current measurement and affect the accuracy of current measurement data.

[0005] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the prior art in the field. Utility Model Content

[0006] In view of one or more defects in the prior art, the utility model provides a current measuring device, comprising:

[0007] Measurement department, including:

[0008] The first core;

[0009] a second core, wherein the second core and the first core jointly define a measurement space, a wire can pass through the measurement space, and the second core is configured to be movable relative to the first core so that the measurement space is switched between a closed state and an open state; wherein when the current passing through the wire changes, the magnetic field in the first core and / or the second core changes;

[0010] a coil, wherein the coil is wound around the first iron core and / or the second iron core, and when the magnetic field in the first iron core and / or the second iron core changes, a current is induced in the coil;

[0011] a fixing member, the fixing member being at least partially located in the measuring space to fix the wire;

[0012] A user interface configured to be operable by a user; and

[0013] An electric drive device is connected to the user interface and controlled by the user interface. When a user operates the user interface, the electric drive device is configured to drive the second iron core to move relative to the first iron core to close or open the measurement space.

[0014] According to one aspect of the utility model, the first iron core and / or the second iron core includes a bending portion; the electric drive device is configured to enable relative movement between the fixing member and the bending portion so that the fixing member approaches or moves away from the bending portion to fix or release the wire in the measuring space.

[0015] According to one aspect of the utility model, the first iron core includes a bending portion, and the electric drive device drives the fixing member to move closer to or away from the bending portion.

[0016] According to one aspect of the utility model, the electric drive device includes a first electric drive device for driving the fixing member and a second electric drive device for driving the second iron core.

[0017] According to one aspect of the utility model, the fixing member is fixedly connected to the second iron core, and the second iron core and the fixing member move synchronously under the drive of the electric drive device.

[0018] According to one aspect of the utility model, when the second core is engaged with the first core, the fixing member is close to the bending portion; when the second core is separated from the first core, the fixing member is away from the bending portion.

[0019] According to one aspect of the utility model, the electric drive device drives the second iron core to rotate relative to the first iron core.

[0020] According to one aspect of the utility model, the electric drive device drives the second iron core to move in a straight line relative to the first iron core.

[0021] According to one aspect of the utility model, the fixing member comprises:

[0022] mandrel;

[0023] A first elastic member is disposed between the push rod and the second iron core.

[0024] According to one aspect of the utility model, the elastic force direction of the first elastic member is parallel to the movement direction of the second iron core, and the first elastic member has a preload deformation so that the push rod is close to the bending portion.

[0025] According to one aspect of the utility model, the surface of the push rod facing the bending portion is a plane, or a curved surface in a groove shape.

[0026] According to one aspect of the utility model, the fixing member comprises:

[0027] A clamping portion, wherein the clamping portion is configured to cooperate with the bending portion to fix the wire;

[0028] a connecting rod, wherein the connecting rod is connected to the second iron core and the clamping portion, and when the electric drive device drives the second iron core to move, the connecting rod drives the clamping portion to move closer to or away from the bending portion; and

[0029] A second elastic member, wherein the second elastic member is connected to the clamping portion, and the second elastic member has a preloaded deformation so as to make the clamping portion close to the bending portion.

[0030] According to one aspect of the utility model, the electric drive device and the second iron core can be separately arranged. When the electric drive device is connected to the second iron core, the second iron core can be driven by the electric drive device; when the electric drive device is separated from the second iron core, the second iron core is configured to be manually driven.

[0031] According to one aspect of the utility model, the electric drive device includes an electric motor and a transmission mechanism, the electric motor is connected to the second iron core through the transmission mechanism, and the transmission mechanism includes a gear rack or a lead screw nut.

[0032] According to one aspect of the utility model, when the second iron core and the first iron core are joined, an induction loop is formed; the joining end faces of the second iron core and the first iron core are planes or toothed faces that match each other.

[0033] According to one aspect of the utility model, the fixing member can press the conductive wire against the peripheral wall of the measuring space, or press the conductive wire against the middle of the measuring space.

[0034] According to one aspect of the utility model, the user interface includes a handle, a button or a toggle switch.

[0035] According to one aspect of the utility model, the utility model also includes a method for current measurement, comprising:

[0036] receiving a first user operation;

[0037] According to the first user operation, the second iron core is controlled to separate from the first iron core by electric driving so that the measurement space is opened;

[0038] Place the conductor into the measurement space;

[0039] receiving a second user operation;

[0040] According to the second user operation, the second iron core is controlled to engage with the first iron core by electric driving so as to close the measurement space;

[0041] Fix the conductor in the measurement space and measure the current;

[0042] receiving a first user operation;

[0043] According to the first user operation, the second iron core is controlled to separate from the first iron core by electric driving, so that the measuring space is opened, and the wire is taken out from the measuring space.

[0044] According to one aspect of the present invention, a method for current measurement is performed by the current measurement device as described above.

[0045] Compared with the prior art, the embodiment of the utility model provides a current measuring device, wherein the first iron core and the second iron core are arranged to be able to move relative to each other so that the measuring space is closed or opened, the wire can be placed in the measuring space, the second iron core is driven by an electric drive device to improve the movement stroke accuracy of the second iron core, and the user can realize convenient operation through the user interface to simplify the operation process of the current measuring device and improve the accuracy of current measurement. At the same time, in this embodiment, the fixing member is used to fix the wire, which can further improve the measurement accuracy of the current measuring device.

[0046] The utility model also includes an embodiment of a current measurement method, which uses the above-mentioned current measurement device. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0048] Figure 1 It is a structural schematic diagram of a current measuring device in one embodiment of the utility model;

[0049] Figure 2 is a schematic diagram of an embodiment of the utility model in which the second core includes a bent portion;

[0050] Figure 3 is a schematic diagram of a first electric drive device and a second electric drive device in an embodiment of the utility model;

[0051] Figure 4 is a schematic diagram of a fixing member in one embodiment of the utility model;

[0052] Figure 5A and Figure 5B Schematic diagram of the surface of the top rod facing the bending portion in different embodiments of the utility model;

[0053] Figure 6 is a schematic diagram of a measuring part in another embodiment of the utility model;

[0054] Figure 7 is a schematic diagram of an embodiment of the utility model in which the electric drive device and the second iron core are separated;

[0055] Figure 8 is a schematic diagram of another embodiment of the utility model in which the transmission mechanism includes a lead screw and a nut;

[0056] Fig. 9 is a cross-sectional view of the joint end surface of the first iron core and the second iron core in one embodiment of the utility model;

[0057] Fig.10 It is a flow chart of a current measurement method in one embodiment of the utility model. DETAILED DESCRIPTION

[0058] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0059] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 cannot be understood as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0060] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0063] The following describes embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0064] Figure 1 The structure of the current measuring device 100 according to some embodiments of the present utility model is shown below. Figure 1 The current measuring device 100 will be described.

[0065] like Figure 1As shown, the current measuring device 100 includes a measuring unit 110, a user interface 130 and an electric drive device 120. The measuring unit 110 includes a first core 111, a second core 112, a coil 113 and a fixing member 114. The first core 111 and the second core 112 define a measuring space 115 together.

[0066] The first iron core 111 and the second iron core 112 can be joined to form a closed annular space. When the two are separated, the conductor of the current to be measured is placed in the measuring space 115; during measurement, the measuring space 115 is closed; after the measurement is completed, the measuring space 115 is opened so that the conductor can be taken out.

[0067] In this embodiment, the second core 112 is configured to be able to move relative to the first core 111. Specifically, the second core 112 can be configured to be able to move along a straight line relative to the first core 111, or to be able to rotate relative to the first core 111, so that the second core 112 and the first core 111 can be engaged or separated. Accordingly, the measurement space 115 has a closed state and an open state. By driving the second core 112 to move relative to the first core 111, the measurement space 115 can be switched between the closed state and the open state. Figure 1 As shown in FIG. 1 , the first core 111 and the second core 112 are joined, and the measuring space 115 is in a closed state. When the current in the wire passing through the measuring space 115 changes, the magnetic field in the first core 111 and / or the second core 112 changes.

[0068] The coil 113 is wound around the first core 111 and / or the second core 112, for example Figure 1 As shown in , the coil 113 is wound on the first core 111. When the magnetic field in the first core 111 and / or the second core 112 changes, an induced current is generated in the coil 113 accordingly. The change in the magnetic field in the first core 111 and / or the second core 112 can be quantified by measuring the induced current of the coil 113, and then the current passing through the conductor can be measured. Preferably, the coils can be wound on the first core 111 and the second core 112 at the same time, and the current passing through the conductor can be calculated respectively by the induced current generated in the two coils, and the two calculated current values ​​are averaged, so as to obtain a more accurate current measurement result. According to another embodiment of the utility model, the two coils wound on the first core 111 and the second core 112 can also be connected in series to change the magnitude of the induced current generated in the coil when the magnetic field changes.

[0069] At least part of the fixing member 114 is located in the measuring space 115 and can be used to fix the wire. When measuring wires of different sizes, the wire with a smaller diameter may move in the measuring space 115, causing the distance between the wire and the first iron core 111 and the second iron core 112 to change, affecting the magnetic field change in the first iron core 111 and the second iron core 112, and further affecting the accuracy of the current measurement. The fixing member 114 can fix the wire at a fixed position in the measuring space 115, further improving the accuracy of the current measurement.

[0070] The user interface 130 is configured to receive user operations. In different embodiments of the present invention, the user interface 130 may include any structural member that can be operated by the user, including but not limited to a handle, a button, or a toggle switch. The user can perform operations according to the specific user interface type, and the user operation can be performed by the electric drive device 120. The user interface can be set on the housing of the current measuring device 100 ( Figure 1 ), to facilitate user operation.

[0071] The electric drive device 120 is an actuator, which is connected to the user interface 130 and controlled by the user interface 130. When the user operates the user interface 130, such as pulling a handle or pressing a button, an electrical signal is transmitted to the electric drive device 120, and the electric drive device 120 can drive the second iron core 112 to move relative to the first iron core 111, so that the measurement space 115 is opened or closed. The connection between the electric drive device 120 and the user interface 130 can be in the form of an electrical connection or in the form of a mechanical trigger. For example, when the user presses the user interface 130, the mechanical pressing action is transmitted to the electric drive device 120, thereby triggering the electric drive device 120.

[0072] In different embodiments of the present invention, the electric drive device 120 drives the second core 112 to rotate relative to the first core 111, or the electric drive device 120 drives the second core 112 to move linearly relative to the first core 111. This can be achieved through a specific form of a transmission mechanism, which will be described in detail in subsequent embodiments.

[0073] In this embodiment, the user can operate through the user interface 130, use the electric drive device 120 to drive the second iron core 112 to move relative to the first iron core 111, open the measurement space 115, place the wire in the measurement space 115, and then use the electric drive device 120 to drive the second iron core 112 and the first iron core 111 to engage, and close the measurement space 115. This embodiment simplifies the operation process of the current measuring device 100, and can keep the second iron core 112 in a stable position, which is conducive to improving the measurement accuracy of the current measuring device 100.

[0074] Specifically, the electric drive device 120 may include, for example, a motor 121 and a transmission mechanism 122. The user controls the motor 121 to start, stop or reverse through the user interface 130, thereby driving the second iron core 112 to move to a preset position, and the preset position may be maintained, for example, the second iron core 112 is maintained at a position engaged with the first iron core 111. This embodiment can ensure that when measuring the conductor, the second iron core 112 and the second iron core 111 remain engaged, thereby improving the accuracy of current measurement. In addition, according to an embodiment of the utility model, a reducer may be provided between the motor 121 and the transmission mechanism 122 to reduce the speed of the motor 121 output and match the output of the motor 121 with the input of the transmission mechanism 122.

[0075] In a preferred embodiment of the present invention, Figure 1 As shown, the first core 111 and / or the second core 112 include a bent portion, such as Figure 1 As shown, the first core 111 includes a bending portion 1111; alternatively, in other embodiments of the present invention, the second core 112 may be provided with a bending portion, and the bending portion 1111 can cooperate with the fixing member 114 to fix the wire in the measuring space 115. Alternatively, bending portions may be provided on both the first core 111 and the second core 112, as long as the bending portions of the two can cooperate with each other to form a closed measuring space 115.

[0076] Specifically, the electric drive device 120 is configured to enable relative movement between the fixing member 114 and the bending portion 1111. For example, in one embodiment of the present invention, Figure 1 As shown, the first core 111 includes a bending portion 1111, and the position of the first core 111 can be set to remain fixed (relative to the housing of the current measuring device 100). The fixing member 114 is driven by the electric drive device 120 to move relative to the bending portion 1111, approaching or moving away from the bending portion 1111. When the fixing member 114 is close to the bending portion, the fixing member 114 can cooperate with the bending portion to fix the wire; when the fixing member 114 is away from the bending portion, the wire therein can be released.

[0077] In other embodiments of the present invention, Figure 2 As shown, the second core 112 includes a bent portion 1121, and the fixing member 114 can be appropriately adjusted in position by an elastic member such as a spring. The elastic member can be arranged at Figure 2The bottom of the fixing member 114 in the middle. One end of the elastic member is against the fixing member 114, and the other end is fixed, for example, fixed to the first core 111 or fixed to the housing of the current measuring device 100. The elastic member has a preloaded deformation, which biases the fixing member 114 upward. When the electric drive device 120 drives the second core 112 to move relative to the first core 111, the measuring space 115 is opened. At this time, the wire of the current to be measured is placed in the measuring space 115, and then the second core 112 is driven by the electric drive device 120 to move relative to the first core 111 to close the measuring space 115. During the closing process, the bending portion 1121 applies pressure to the fixing member 114 through the wire, forcing the fixing member 114 to move downward. After the closing process is completed, due to the upward biasing force of the elastic member, the wire is firmly held in the measuring space 115. After the current measurement is completed, the electric drive device 120 drives the second core 112 to move relative to the first core 111 to open the measuring space 115 . At this time, the elastic force generated by the elastic member will help push the wire out of the measuring space 115 .

[0078] According to a preferred embodiment of the present utility model, Figure 3 As shown, the electric drive device 120 includes a first electric drive device 123 for driving the fixing member 114 to move, and a second electric drive device 124 for driving the second core 112 to move. The first electric drive device 123 and the second electric drive device 124 in this embodiment can be set to be independent of each other, and are respectively controlled by the user through the user interface 130, so that the movement and movement direction of the fixing member 114 and the second core 112 can be controlled separately, and the structural design of the current measuring device 100 is more flexible. Specifically, the first electric drive device 123 and the second electric drive device 124 can share the same user interface 130, and when the user operates the user interface 130, the first electric drive device 123 and the second electric drive device 124 are started synchronously. For example, when the user presses the user interface 130 (e.g., a button), the second electric drive device 124 drives the second core 112 to move relative to the first core 111 to open the measurement space 115, and synchronously, the first electric drive device 123 drives the fixing member 114 to move downward to increase the measurement space 115; when the user releases the user interface 130, the second electric drive device 124 drives the second core 112 to move relative to the first core 111 to close the measurement space 115, and synchronously, the first electric drive device 123 drives the fixing member 114 to move upward to reduce the measurement space 115, thereby firmly holding the wire in the measurement space 115. Alternatively, separate user interfaces 130 may be provided for the first electric drive device 123 and the second electric drive device 124, respectively, which will not be described in detail herein.

[0079] In a preferred embodiment of the present invention, the fixing member 114 and the second core 112 can be fixedly connected together, so that the second core 112 and the fixing member 114 are driven by the same electric drive device 120 to move synchronously. Figure 1 In the embodiment, the fixing member 114 is fixedly connected to the second core 112, and the two realize synchronous motion. It is easy for those skilled in the art to understand that in the context of the present invention, "synchronous" motion means that two motions occur at the same time, and does not mean that the two motions have the same form, displacement, and speed, for example, including the case where the two motions have different forms, speeds, or directions. In this embodiment, a motor 121 can be used to drive the second core 112 and the fixing member 114 to move synchronously, which can simplify the internal structure of the current measuring device 100 and is conducive to the lightweight and miniaturization of the current measuring device 100.

[0080] Further, the first core 111 includes a bending portion 1111, and when the second core 112 and the first core 111 are engaged, the measuring space 115 is closed, and the fixing member 114 is close to the bending portion 1111 to fix the wire in the measuring space 115. When the second core 112 and the first core 111 are separated, the measuring space 115 is opened, and the fixing member 114 moves with the second core 112, away from the bending portion 1111, and the wire in the measuring space 115 is released.

[0081] According to a preferred embodiment of the present utility model, Figure 1 As shown, the electric drive device 120 drives the second core 112 to move along a straight line relative to the first core 111, that is, Figure 1 Moves in the vertical direction.

[0082] like Figure 4 As shown, a partial structure in the fixing member 114 is fixedly connected to the second core 112 , wherein the fixing member 114 includes a top rod 1141 and a first elastic member 1142 , and the top rod 1141 is preferably arranged along the movement direction of the second core 112 .

[0083] The first elastic member 1142 is disposed between the top rod 1141 and the second core 112. For example, one end of the first elastic member 1142 is fixedly connected to the second core 112, and the other end of the first elastic member 1142 is fixedly connected to the top rod 1141. The first elastic member 1142 can undergo a certain elastic deformation to generate an elastic force. Preferably, the elastic force direction of the first elastic member 1142 is set to be parallel to the movement direction of the second core 112, for example Figure 1 As shown in , the second core 112 is configured to be able to move vertically under the drive of the electric drive device 120, and the elastic force direction of the first elastic member 1142 is substantially arranged along the vertical direction.

[0084] Further, in a preferred embodiment of the present invention, the first elastic member 1142 has a preloaded deformation so that the top rod 1141 can be close to the bending portion. Figure 4 As shown, the first elastic member 1142 is preferably a coil spring, which is pre-compressed so that the top rod 1141 is subjected to an upward elastic force and is close to the bending portion 1111 of the first core 111. The coil spring can also be further compressed to provide a larger space for the top rod 1141 to move. In addition, in the context of the present invention, the fixing member 114 is "fixedly connected" to the second core 112, which includes both a situation where the two are rigidly connected and a situation where there is a certain degree of freedom of movement between the two. For example, as mentioned above, the lower end of the top rod 1141 is connected to the first elastic member 1142 (such as Figure 4 As shown in FIG. 1 ), one end of the first elastic member 1142 abuts against the top rod 1141, and the other end is connected to the second core 112, so a part of the fixing member 114 (top rod 1141) can move relative to the second core 112. This also belongs to the case of "fixed connection" in the present invention.

[0085] Specifically, Figure 4 As shown, an outer cover 1147 can be provided in the circumferential direction of the first elastic member 1142, which can not only protect the first elastic member 1142, but also limit the elastic deformation direction of the first elastic member 1142. In different embodiments of the utility model, the first elastic member 1142 can also be provided in other types, such as a spring sheet, a rubber spring, etc. In addition, according to one embodiment of the utility model, the outer cover 1147 can also be used as a guide device for the top rod 1141. Specifically, a hole can be provided on the outer cover 1147 (for example, in Figure 4 In the embodiment, the upper end of the outer cover 1147 is provided with a through hole), the top rod 1141 is inserted into the hole so as to be able to reciprocate along the hole, and the lower end abuts against the first elastic member 1142. In this way, the outer cover 1147 can be used to guide the movement direction of the top rod 1141.

[0086] The first elastic member 1142 in this embodiment can make the distance between the top rod 1141 and the bending portion 1111 have a certain adjustable range. When the current measuring device 100 measures wires of different sizes, the wire can compress the first elastic member 1142 through the top rod 1141 to make the distance between the top rod 1141 and the bending portion 1111 match the size of the wire, and keep the wires of different sizes in a fixed position. For example, for a wire with a larger diameter, the compression of the first elastic member 1142 can prevent the distance between the top rod 1141 and the bending portion 1111 from being too close, which will cause excessive pressure on the wire and damage the wire. It can also prevent the first iron core 111 and the second iron core 112 from being unable to be joined due to the size of the wire being too large.

[0087] like Figure 5A and Figure 5B As shown, according to different embodiments of the utility model, the surface of the top rod 1141 facing the bending portion 1111 can be set as a plane, or can be set as a curved surface that is concave in the direction away from the bending portion 1111. In most application scenarios, the cross-section of the wire is usually circular, so the surface of the top rod 1141 facing the bending portion 1111 is preferably set as a groove-shaped curved surface to fix the wire and prevent the wire from falling out, and can also disperse the pressure of the top rod 1141 on the surface of the wire to avoid damage to the wire.

[0088] According to other embodiments of the present invention, Figure 6 As shown, the fixing member 114 includes a clamping portion 1143, a connecting rod 1144, a guide device 1145 and a second elastic member 1146. In this embodiment, the clamping portion 1143 is configured to cooperate with the bending portion 1111 to fix the wire. One side of the clamping portion 1143 close to the bending portion 1111 can also be configured as a curved surface to match the shape of the wire.

[0089] The connecting rod 1144 is connected to the second core 112 and the clamping portion 1143. When the electric drive device 120 drives the second core 112 to move, the second core 112 drives the clamping portion 1143 to move closer to or away from the bending portion 1111 through the connecting rod 1144. In different embodiments of the utility model, the connecting rod 1144 can be configured to be fixedly connected to the second core 112 and the clamping portion 1143 so that the movement direction and movement distance of the clamping portion 1143 and the second core 112 are consistent (for the case where the second core 112 moves along a straight line relative to the first core 111). The connecting rod 1144 can also be movably connected to the second core 112 and the clamping portion 1143, for example, by hinged connection or connection through a slide slot hole, so that the second core 112 and the clamping portion 1143 are both driven by the electric drive device 120 and have different movement directions and movement distances (for the case where the second core 112 rotates relative to the first core 111).

[0090] Specific, for example Figure 6 As shown, the second core 112 is configured to be able to rotate relative to the first core 111 under the drive of the electric drive device 120, and the two ends of the connecting rod 1144 are respectively hinged to the second core 112 and the clamping portion 1143. When the second core 112 rotates relative to the first core 111, the clamping portion 1143 can be limited by the guide device 1145 and move in a straight line relative to the first core 111. The guide device 1145 is fixedly arranged on the first core 111, for example, in the form of a guide rod, and the clamping portion 1143 is sleeved on the guide device 1145.

[0091] In other embodiments of the utility model, the second iron core 112 is configured to be able to rotate relative to the first iron core 111 under the drive of the electric drive device 120, and the connecting rod 1144 can be configured to be hinged to the clamping portion 1143 at one end and connected to the second iron core 112 through a slide slot hole at the other end, that is, the connecting rod 1144 can not only rotate relative to the second iron core 112, but also move relative to the second iron core 112 along the direction of the slide slot hole.

[0092] In this embodiment, the fixing member 114 further includes a second elastic member 1146, for example, which is sleeved on the guide device 1145. The second elastic member 1146 rests against the clamping portion 1143, and the second elastic member 1146 has a preloaded deformation so that the clamping portion 1143 is close to the bending portion 1111. The second elastic member 1146 is preloaded with deformation so that the clamping portion 1143 is subjected to an elastic force toward the bending portion 1111, so that the clamping portion 1143 is close to the bending portion 1111. When there is a wire in the measuring space 115, the second elastic member 1146 can be compressed according to the size of the wire, so that the clamping portion 1143 can fix the wire and maintain appropriate pressure, so that the wire can be stably fixed and the wire can be prevented from being damaged by pressure.

[0093] In a preferred embodiment of the present invention, the surfaces of the top rod 1141, the clamping portion 1143 and the bending portion 1111 in the above-mentioned different embodiments that cooperate with each other can also be provided with a flexible structure to protect the wire. The structures of the fixing member 114 in the above-mentioned embodiments are all specific embodiments of the present invention, and the fixing member 114 can also be provided in other forms, not limited to the above-mentioned specific structures.

[0094] like Figure 7 As shown, according to a preferred embodiment of the utility model, the electric drive device 120 is configured to be separable from the second iron core 112. Specifically, the position of the electric drive device 120 or the second iron core 112 can be changed by pulling, pushing, pulling, etc., and preferably the position of the electric drive device 120 or the transmission mechanism 122 therein can be changed.

[0095] When the electric drive device 120 is connected to the second core 112, the second core 112 can be driven by the electric drive device 120. When the electric drive device 120 is separated from the second core 112, the second core 112 is configured to be manually driven. Further, the movement stroke of the second core 112 when driven by the electric drive device 120 and when manually driven is consistent, for example, a limit mechanism is provided on the housing of the current measuring device 100 to limit the movement range of the second core 112.

[0096] In this embodiment, the electric drive device 120 and the second core 112 are arranged to be separable, which can prevent the situation where the position of the second core 112 is locked due to a failure of the electric drive device 120. In actual use, the electric drive device 120 may fail, for example, it is affected by a power outage or electromagnetic influence in the working environment and cannot output. Due to the limitation of the electric drive device 120, the position of the second core 112 may be unable to move and locked. In this case, the electric drive device 120 can be controlled to separate from the second core 112, and the second core 112 can be manually driven to move, so as to open the measurement space 115 and take out the wire therein.

[0097] In a preferred embodiment of the present utility model, the electric drive device 120 includes a motor 121 and a transmission mechanism 122 . The motor 121 is connected to the second iron core 112 via the transmission mechanism 122 to drive the second iron core 112 to move.

[0098] According to different embodiments of the present invention, Figure 1 and Figure 7 As shown, the transmission mechanism 122 includes a gear 1221 and a rack 1222. For example, the gear 1221 is connected to the output shaft of the motor 121, and a rack 1222 that cooperates with the gear 1221 is provided on the second iron core 112. The motor 121 drives the gear 1221 to rotate, and the rotation is converted into linear motion by utilizing the cooperation relationship between the gear 1221 and the rack 1222.

[0099] In other embodiments of the present invention, Figure 8 As shown, the transmission mechanism 122 includes a screw 1223 and a nut 1224 that cooperate with each other. For example, the screw 1223 is connected to the output shaft of the motor 121, and a nut 1224 that cooperates with the screw 1223 is provided on the second core 112. When the screw 1223 rotates under the drive of the motor 121, the nut 1224 and the second core 112 move in a straight line. In different embodiments of the utility model, the transmission mechanism 122 can also select other types, and a suitable transmission mechanism 122 is selected according to the output form of the motor 121 and the movement mode of the second core 112 relative to the first core 111.

[0100] According to a preferred embodiment of the utility model, when the second core 112 and the first core 111 are joined, an induction loop is formed, wherein the joint end faces of the second core 112 and the first core 111 are planes or toothed surfaces that match each other. Preferably, the joint end faces of the second core 112 and the first core 111 are arranged to be toothed surfaces that match each other, such as Fig. 9As shown, for example, the end surface of the second core 112 that is joined to the first core 111 is provided with a plurality of protruding rectangular teeth or triangular teeth, and the end surface of the first core 111 that is joined to the second core 112 is provided with corresponding grooves, so that the first core 111 and the second core 112 can be interlocked with each other, thereby further improving the combination stability of the first core 111 and the second core 112, maintaining the stability of the induction loop, and reducing the error generated during the current measurement process.

[0101] In a specific embodiment of the present invention, the fixing member 114 is configured to cooperate with the bending portion 1111 to press the wire against the peripheral wall of the measuring space 115, and the peripheral wall may be the inner wall of the bending portion 1111 facing the fixing member 114. Alternatively, in other embodiments of the present invention, a limited position structure is provided in the measuring space 115, which can cooperate with the fixing member 114 to keep the wire in the middle position of the measuring space 115, wherein the limited structure in the measuring space 115 may be made of a magnetically insulating material.

[0102] like Fig.10 As shown, the utility model also includes an embodiment of a current measurement method S100, using the current measurement device 100 described in the above embodiment, Fig.10 The current measuring method S100 will be described.

[0103] like Fig.10 As shown, in step S101, a first user operation is received. Specifically, the user operation is received by the user interface in the current measuring device 100. The user operation matches the specific structure of the user interface. For example, the user interface includes a button, and the user operation may be pressing the button; the user interface includes a toggle switch, and the user operation may be toggling the toggle switch. In different embodiments of the present utility model, the user interface in the current measuring device 100 may include a plurality of different buttons, which respectively match different user operations and control the electric drive device 120 to perform different actions, such as respectively controlling the second core 112 to engage with the first core 111, controlling the second core 112 to separate from the first core 111, and controlling the fixing member 114 to move relative to the bending portion 1111. In this embodiment, the first user operation represents controlling the second core 112 to separate from the first core 111.

[0104] The structure of the current measuring device is described in detail above. Those skilled in the art can easily understand that in order to complete the function of current measurement, a corresponding circuit or chip can be provided for the current measuring device. The present utility model does not involve specific improvements thereto, so it is not described in detail.

[0105] In step S102, according to the first user operation, the second core 112 and the first core 111 are controlled to separate by electric drive to open the measurement space 115. The current measurement method S100 is used to measure the current in the wire. First, the measurement space 115 needs to be opened according to the user operation so that the wire can enter the measurement space.

[0106] In step S103 , the wire is placed in the measurement space 115 .

[0107] In step S104 , a second user operation is received, wherein the second user operation indicates controlling the second core 112 and the first core 111 to engage with each other, and in step S105 , the second core 112 and the first core 111 are controlled to engage with each other by electric drive to close the measurement space 115 .

[0108] In a preferred embodiment of the present invention, the second user operation and the first user operation can be received by the same user interface, for example, the user interface includes a button, and the user can press the button to make the electric drive device 120 drive the second iron core 112 and the first iron core 111 to separate, and press the button again or release the button to make the second iron core 112 and the second iron core 111 engage. After the second iron core 112 and the first iron core 111 engage, the measuring space 115 is in a closed state, and the wire is located in the measuring space 115.

[0109] In step S106, the wire is fixed in the measurement space 115, and the current is measured. Specifically, the wire can be fixed by the fixing member 114. The setting form of the fixing member 114 and the method of fixing the wire can refer to the above-mentioned embodiment. The position of the wire in the measurement space 115 is fixed, and according to the magnetic field change in the second iron core 112 and / or the first iron core 111, and the current change of the coil 113, a current measurement result with high accuracy can be obtained.

[0110] In step S107, a first user operation is received, and the second core 112 and the first core 111 are controlled to separate, so that the measuring space 115 is in an open state, and the wire can be taken out of the measuring space 115. Further, the fixing member 114 can be operated to move the fixing member 114 away from the bending portion 1111, and the wire is released, so that the wire can be taken out of the opened measuring space 115.

[0111] According to an embodiment of the present invention, the current measurement method S100 is implemented by the current measurement device 100 described in the above embodiment.

[0112] Finally, it should be noted that the above description is only an embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A current measuring device, characterized in that: include: Measurement department, including: The first core; a second core, wherein the second core and the first core jointly define a measurement space, a wire can pass through the measurement space, and the second core is configured to be movable relative to the first core so that the measurement space is switched between a closed state and an open state; wherein when the current passing through the wire changes, the magnetic field in the first core and / or the second core changes; a coil, wherein the coil is wound around the first iron core and / or the second iron core, and when the magnetic field in the first iron core and / or the second iron core changes, a current is induced in the coil; a fixing member, the fixing member being at least partially located in the measuring space to fix the wire; A user interface configured to be operable by a user; and An electric drive device is connected to the user interface and controlled by the user interface. When a user operates the user interface, the electric drive device is configured to drive the second iron core to move relative to the first iron core to close or open the measurement space.

2. The current measuring device according to claim 1, characterized in that: The first core and / or the second core comprises a bending portion; the electric drive device is configured to enable relative movement between the fixing member and the bending portion so as to move the fixing member closer to or away from the bending portion to fix or release the wire in the measuring space.

3. The current measuring device according to claim 1, characterized in that: The first iron core includes a bending portion, and the electric drive device drives the fixing member to approach or move away from the bending portion.

4. The current measuring device according to claim 3, characterized in that: The electric drive device includes a first electric drive device for driving the fixing member and a second electric drive device for driving the second core.

5. The current measuring device according to claim 3, characterized in that: The fixing member is fixedly connected to the second iron core, and the second iron core and the fixing member move synchronously under the driving of the electric driving device.

6. The current measuring device according to claim 5, characterized in that: When the second core is joined to the first core, the fixing member is close to the bending portion; when the second core is separated from the first core, the fixing member is away from the bending portion.

7. The current measuring device according to any one of claims 2 to 6, characterized in that: The electric drive device drives the second iron core to rotate relative to the first iron core.

8. The current measuring device according to any one of claims 2 to 6, characterized in that: The electric drive device drives the second core to move linearly relative to the first core.

9. The current measuring device according to claim 8, characterized in that: The fixing member comprises: mandrel; A first elastic member is disposed between the push rod and the second iron core.

10. The current measuring device according to claim 9, characterized in that: The elastic force direction of the first elastic member is parallel to the movement direction of the second iron core, and the first elastic member has a preload deformation so that the push rod is close to the bending portion.

11. The current measuring device according to claim 9, characterized in that: The surface of the push rod facing the bending portion is a plane or a curved surface in a groove shape.

12. The current measuring device according to claim 7, characterized in that: The fixing member comprises: A clamping portion, wherein the clamping portion is configured to cooperate with the bending portion to fix the wire; a connecting rod, wherein the connecting rod is connected to the second iron core and the clamping portion, and when the electric drive device drives the second iron core to move, the connecting rod drives the clamping portion to move closer to or away from the bending portion; and A second elastic member, wherein the second elastic member is connected to the clamping portion, and the second elastic member has a preloaded deformation so as to make the clamping portion close to the bending portion.

13. The current measuring device according to any one of claims 1 to 6, characterized in that: The electric drive device and the second core can be separately arranged. When the electric drive device is connected to the second core, the second core can be driven by the electric drive device; when the electric drive device is separated from the second core, the second core is configured to be manually driven.

14. The current measuring device according to any one of claims 1 to 6, characterized in that: The electric drive device includes an electric motor and a transmission mechanism, the electric motor is connected to the second iron core through the transmission mechanism, and the transmission mechanism includes a gear rack or a lead screw nut.

15. The current measuring device according to any one of claims 1 to 6, characterized in that: When the second iron core and the first iron core are joined, an induction loop is formed; the joint end surfaces of the second iron core and the first iron core are planes or toothed surfaces that match each other.

16. The current measuring device according to any one of claims 1 to 6, characterized in that: The fixing member can press the conductive wire against the peripheral wall of the measuring space, or press the conductive wire against the middle of the measuring space.

17. The current measuring device according to any one of claims 1 to 6, characterized in that: The user interface includes a handle, a button or a toggle switch.

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