Electric wiring terminal
By using elastic elements and extensions in the terminal block design, the loosening problem caused by thermal expansion and contraction and electromagnetic vibration is solved, achieving reliable fastener connection and intuitive status judgment, and improving the safety and ease of operation of electrical appliances.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG RUITAN DIGITAL ENERGY CO LTD
- Filing Date
- 2024-11-29
- Publication Date
- 2026-05-19
AI Technical Summary
Existing terminal blocks in electrical appliances may experience loosening of screws due to thermal expansion and contraction and electromagnetic vibration, resulting in unreliable connections. Furthermore, operators cannot visually determine whether the fastening is secure, posing a safety hazard.
The system uses an elastic element that deforms under the pressure of the fastener, and uses the extension to provide feedback on friction to prevent loosening. The displacement of the extension provides visual or audible signals to indicate the fastening status, ensuring a reliable connection of the fastener.
This improves the installation reliability and safety of the terminal blocks, allowing operators to visually assess the tightness and prevent loosening, thus enhancing operational convenience and safety.
Smart Images
Figure CN122068299A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of low-voltage electrical technology, and more particularly to an electrical terminal block. Background Technology
[0002] Currently, the terminals used in electrical appliances or power distribution systems are basically fixed to the external conductors on the electrical appliance's conductive parts or busbars using screws and nuts or fixed plates or frames with threaded holes. Due to the thermal effect of the electrical current, the conductors and fixed plates or frames experience thermal expansion and contraction, as well as electromagnetic vibration. Over time, this can cause the screws to loosen. Loose screws can lead to unreliable connections between the external conductors and the electrical appliance's conductive parts or busbars, increased contact resistance, or even intermittent connections. Abnormal heating or arcing at the connection point can cause electrical fires. To address this, some users use spring washers or flat washers between the screws and nuts. While this can effectively alleviate the problem of screw loosening, it can also lead to poor anti-loosening effects due to operational errors or insufficient installation torque. In particular, terminals with screw and fixed frame structures are completely inside the insulation, leaving only screw mounting holes and external conductor insertion holes. It is impossible to identify whether the wiring is tightened or not during installation, and operators cannot visually determine whether the tightening is reliable. Summary of the Invention
[0003] Based on the above background, the present invention provides an electrical terminal block in which an elastic element is compressed and deformed when the fastener is tightened. The rebound force of the elastic element deformation provides friction to the fastener to prevent it from loosening. By providing an extension on the elastic element, the extension can present different states in the tightened, loosened, or semi-tightened states by the shape or displacement change of the elastic element itself. This not only prevents loosening but also prompts the operator whether the fastener is tightened properly and reminds maintenance personnel whether the fastener has become loose, greatly improving the convenience and safety of operation.
[0004] The technical solution of the present invention is as follows:
[0005] An electrical terminal block includes at least an elastic element, a fastener, and a conductive element. The elastic element is disposed directly or indirectly between the fastener and / or the conductive element. The elastic element undergoes elastic deformation under the pressure of the fastener, and does not undergo elastic deformation when not under the pressure of the fastener. After undergoing elastic deformation under the pressure of the fastener, the elastic element has an extension extending to at least one side, and the extension directly or indirectly transmits a signal indicating the force or degree of compression of the elastic element.
[0006] In the above embodiments, the elastic element undergoes elastic deformation under the pressure of the fastener, and at the same time, it generates a rebound force on the fastener, causing the threads and pressure surface of the fastener to generate a large friction force, which plays a role in preventing loosening and ensuring a reliable electrical connection between the conductive element and the external connecting conductor. The elastic element undergoes elastic deformation under the pressure of the fastener and rebounds after being loosened. At least one side of the elastic element is provided with an extension. The extension changes displacement with the compression deformation and loosening rebound of the elastic element. The displacement change of the extension is directly or indirectly transmitted to the operator through visual, light or sound signals, prompting the operator whether the fastener is tightened properly, or prompting the maintenance personnel whether the fastener has become loose, which greatly improves safety.
[0007] In some embodiments, the terminal block further includes an insulating element, the elastic element, fastener, and conductive element are disposed on the insulating element, and the extension directly or indirectly transmits a signal of the force value or degree of compression of the elastic element inside and / or outside the insulating element.
[0008] In the above embodiments, when the electrical terminal is applied to an electrical switch, the electrical terminal is set on an insulating component. The elastic component undergoes elastic deformation under the pressure of the fastener and rebounds after being loosened. At least one side of the elastic component is provided with an extension. The extension changes displacement as the elastic component is compressed and deformed and rebounds after being loosened. After the fastener completes the tightening operation, the extension extends outward to indicate the tightening status, or extends inward to trigger an indicator device for indirect indication. The signal is transmitted to the operator through visual, light, or sound signals to prompt the operator whether the tightening is in place, or to the maintenance personnel whether the fastener has become loose, which greatly improves safety.
[0009] In some embodiments, the compression distance of the elastic element by the fastener provides feedback on the size of the elastic deformation. The larger the deformation size of the elastic element, the greater the released elastic force, and the greater the displacement of the extension. When the P1 or P2 value of the elastic element is constant, the displacement size of the extension is also constant.
[0010] In the above embodiments, the yield strength of the elastic element is set according to the pressure generated under the rated torque of the fastener. When the fastener is tightened to the rated torque, the elastic element deforms to the maximum position, the elastic force P2 generated by the elastic element is the maximum, and the displacement of the extension is also the maximum. When the fastener is not tightened, the compression and deformation of the elastic element are small, the elastic force P1 generated by the elastic element is also small, and the displacement of the extension is also small. By judging whether the fastener is tightened reliably by the position or displacement of the extension, the visualization, safety and reliability of the installation wiring are effectively improved.
[0011] In some embodiments, the elastic element is not compressed by fasteners, and the extension directly or indirectly transmits a signal of zero force or no compression of the elastic element inside or / and outside the insulation, or does not transmit a signal.
[0012] In the above embodiments, when the fastener is in a completely loose state, the fastener does not exert any pressure on the elastic element, the elastic element is in a free state, and the extension is also in a state of no displacement. The position of the extension is the initial position, and the fastener is in an untightened state based on the initial position of the extension.
[0013] In some embodiments, the elastic element is any one of a spring, a sheet, a strip, or a block, or any combination thereof.
[0014] In the above embodiments, the elastic element is made of a material with good elasticity, such as a spring, sheet, strip, or block. The yield force of the elastic element is set by matching the pressure generated by the fastener under the rated torque. When the fastener reaches the rated torque, the elastic element deforms to its maximum extent. The positional change of the extension provided on the elastic element is used to determine whether the fastener is fully tightened. This allows the operator to clearly understand the degree of tightening and avoids problems such as loosening or unreliable tightening due to insufficient torque.
[0015] In some embodiments, the signal transmitted by the extension of the elastic member to the force value or degree of compression of the elastic member is any one or any combination of mechanical position indication signal, mechanical sound signal, electric light signal, and electric sound signal.
[0016] In the above embodiments, the extension of the elastic element transmits the reaction force generated by the deformation of the spring sheet or the degree of compression by the fastener to the operator. The operator is prompted by the displacement change of the extension itself, either by mechanical position or by a graduated displacement, to indicate whether the fastener is in place. Alternatively, the extension can trigger an internally installed mechanical sound-emitting device to prompt the operator with an audible signal. Or, the extension can trigger an internally installed light-emitting diode and circuit device, liquid crystal display device, or digital tube device to prompt the operator with an optical signal. Or, a buzzer or electric horn and circuit device can be used to prompt the operator with an audible signal, making the operator clearly aware of the fastening status and greatly facilitating operation.
[0017] In some embodiments, the pressure of the elastic element acts on the conductor and / or directly or indirectly on the insulating element.
[0018] In the above embodiments, after the elastic element is subjected to the pressure of the fastener, most of its reaction force is applied to the conductor, so that there is good pressure contact between the conductor and the external conductor, reducing the contact resistance. Part of the elastic force of the elastic element also acts on the insulating element. When the elastic element undergoes elastic deformation, one side is fixed to the insulating element, so that the elastic element can extend to one side when it undergoes elastic deformation, so that the displacement stroke of the extension is greater and the displacement change is greater, which is more conducive to the operator's observation and judgment of the fastening status.
[0019] In some embodiments, when the elastic member is in a non-compressed state, the extension directly or indirectly indicates a fastener de-tightened state inside or outside the insulation member.
[0020] In the above embodiments, when the elastic element is compressed by the fastener, the elastic element will undergo elastic deformation. The extension provided on the elastic element will be displaced with the amount of deformation of the elastic element. The displacement action can be directly presented to the operator on the outside of the insulating element or through an indicator, or the displacement action can be presented to the operator by driving a sound-emitting device, a mechanical indicator device, an electric light-emitting device, or an electric sound-emitting device inside the insulating element, so as to prompt the operator on the tightness of the fastener.
[0021] In some embodiments, when the elastic element is compressed by the fastener, the extension extends directly outward from the insulation or changes position outside the insulation, indicating a tight or semi-tightened state of the fastener.
[0022] In the above embodiments, the extension of the elastic member undergoes elastic deformation after the elastic member is compressed. During the elastic deformation process, the extension also changes position along with the elastic deformation process of the elastic member. The position change is displayed on the outside of the insulating member so that the operator can observe the tightness of the fastener.
[0023] In some embodiments, the extension of the elastic member is provided with an indicator linked thereto, the indicator indicating the tightness, looseness or semi-tightness of the fastener to the outside of the insulating member.
[0024] In the above embodiment, an indicator is provided on the extension of the elastic member, which is linked to the extension. The indicator indirectly displays the fastening status of the fastener to the outside of the insulating member. The shape and color of the indicator can be set individually, and the fastening status of the fastener can be arbitrarily presented on multiple outer surfaces of the insulating member, making it easier for the operator to observe and confirm the fastening status of the fastener.
[0025] In some embodiments, the extension and / or the indicator and / or the insulating member are provided directly or indirectly with an indicator for indicating the tightness, looseness or semi-tightness of the fastener, and the information presented by the indicator is at least a color recognition part and / or a scale and / or text.
[0026] In the above embodiments, the indicator is a device that presents a visual signal. The signal presented is a color recognition unit or / and scale or / and text, which can be seen by the operator in a relatively conspicuous manner and make a correct judgment.
[0027] In some embodiments, a sound reed or metal sheet is fixedly disposed inside the insulating member, and when the elastic member changes between a compressed state and / or a non-compressed state, the extension triggers the sound reed or metal sheet to emit a sound.
[0028] In the above embodiments, a sound reed or metal sheet is fixedly installed inside the insulating component. The extension changes position by pressing the elastic component with a fastener. The position change of the extension triggers the sound reed or metal sheet to generate a sound wave signal, so that the operator can clearly hear the sound signal and judge whether the fastener is tight and reliable by the sound signal.
[0029] In some embodiments, an electric light-emitting device and / or an electric sound-emitting device are provided within the insulating member. When the elastic member changes between a compressed state and / or a non-compressed state, the extension directly or indirectly triggers the electric light-emitting device and / or the electric sound-emitting device to provide feedback on the fastener's tightness, looseness, or semi-tightness through light or / or sound.
[0030] In the above embodiments, an electric light-emitting device or an electric sound-emitting device is provided inside the insulating member. When the elastic member is compressed and / or in a non-compressed state, the extension changes position. The position change of the extension triggers the electric light-emitting device or the electric sound-emitting device to generate light or sound signals to prompt the operator on the tightness of the fastener. The light signal can be emitted by a light-emitting diode, an LCD screen, or a digital tube, etc., and the sound signal can be emitted by a buzzer or an electric horn.
[0031] In some embodiments, the elastic element is a spring sheet, which is wavy and disposed between two conductive elements. When the fastener is tightened, the spring sheet is compressed and gradually unfolded, with the extension of the spring sheet extending into or out of the insulating element.
[0032] In the above embodiments, when the elastic element is a spring sheet, the spring sheet is wavy and is disposed between two conductive elements. When the fastener is tightened, the gap between the two conductive elements becomes smaller. The elastic element is compressed and undergoes elastic deformation and extends to both sides. The extension part is disposed on both sides of the spring sheet and also extends to both sides with the extension movement of the spring sheet. The extension movement of the extension part presents the tightening and loosening state of the fastener, which makes it easy for the operator to judge the tightening state of the fastener.
[0033] In some embodiments, the elastic element is a spring sheet, the spring sheet is wavy, the fastener presses the top of the spring sheet, the two ends of the spring sheet abut against the conductive element, one side of the spring sheet is provided with a bent portion, the other side is provided with an extension portion, the bent portion abuts against the insulating element, when the fastener is tightened, the top is squeezed to gradually unfold the spring sheet, and the extension portion of the spring sheet extends outward to the insulating element.
[0034] In the above embodiment, the elastic element is a spring sheet, which is wavy. The fastener directly presses the top of the wavy shape, and the two ends of the spring sheet abut against the conductive element to transmit pressure to the conductive element. One side of the spring sheet is provided with a bent part, and the other side is provided with an extension part. The bent part abuts against the insulating element. When the fastener is tightened, the spring sheet is compressed and the wavy shape is extended. The extension part extends outward from the insulating element. By fixing one side of the elastic element, the extension distance of the extension part becomes longer, and the displacement change outside the insulating element will be greater, so that the operator can more clearly observe the tightening state.
[0035] In some embodiments, the elastic element is a spring sheet, which is V-shaped and has a round hole, rectangular hole or oval hole at its top. The fastener is fitted into the round hole, rectangular hole or oval hole. The two ends of the spring sheet abut against the conductive element, and at least one side is an extension. When the fastener is tightened, the top of the spring sheet is squeezed and the spring sheet is gradually unfolded. At least one side of the extension extends to the outside or inside of the insulating element.
[0036] In the above embodiments, the elastic element is a spring sheet, which is V-shaped. The fastener directly presses the top of the V-shape, and the two ends of the spring sheet abut against the conductive element to transmit pressure to the conductive element. At least one side of the spring sheet is provided with an extension portion. When the fastener is tightened, the spring sheet is compressed and the V-shape is extended. The extension portion extends to the outside and / or inside of the insulating element. The elastic element can extend inward or outward, and can directly or indirectly show the tightening state of the fastener on the outside of the insulating element.
[0037] In some embodiments, the elastic element is a spring, the spring is tower-shaped, the top end of the spring is provided with an extension, the extension extends to the outside of the insulating element, the top end of the spring is sleeved on a fastener, the bottom end of the spring abuts against a conductive element, when the fastener is tightened, the spring is compressed, and the extension moves up and down with the elastic deformation of the spring.
[0038] In the above embodiment, the elastic element is a tower-shaped spring. The bottom end of the tower-shaped spring is provided with an extension that extends outward to the outside of the insulating element. The top end of the tower-shaped spring is sleeved on the fastener, and the bottom end abuts against the conductive element. The tower-shaped spring undergoes elastic deformation under the pressure of the fastener. As the elastic deformation occurs, the extension moves outward to the outside of the insulating element in the direction of the fastening pressure. The operator judges the fastening status of the fastener based on the displacement distance of the extension.
[0039] In some embodiments, the elastic element is a spring bar, which is an arc-shaped U-shaped structure with an extension at the opening and a fixing part at the bottom. The fastener is sleeved in the U-shape, with both ends of the spring bar abutting against the conductive element and the fixing part abutting against the insulating element. When the fastener is tightened, the arc-shaped top of the spring bar is compressed, and the spring bar is gradually unfolded. The extension of the spring bar extends to the outside or inside of the insulating element.
[0040] In the above embodiment, the elastic bar is arc-shaped and has a U-shaped structure. The opening direction is the extension part, and the bottom is the fixing part. When the fixing part abuts against the insulating part and the fastener presses the top of the arc, the elastic bar is compressed and undergoes elastic deformation. The arc shape becomes a straight shape and extends to one side. The extension part extends to the outside or inside of the insulating part and is displaced, directly or indirectly presenting the fastening state of the fastener.
[0041] In some embodiments, the elastic element is a spring block, which is a non-metallic material in the shape of a block. The spring block is disposed between the fastener and the conductive element, with an extension on one side and a fixing part on the other side. The fixing part abuts against the insulating element, and the extension part faces outward of the insulating element. When the fastener is tightened, the spring block is squeezed, and the extension part of the spring block protrudes outward of the insulating element.
[0042] In the above embodiments, the spring block is made of non-metallic material, using elastic materials such as rubber or polyurethane, and is arranged in a block shape between the conductive component and the screw. One side is a fixing part that is in close contact with the inner wall of the insulating component and abuts against the insulating component. The other side is an extension part, and the extension direction of the extension part is not restricted by the insulating component. The front is open. When the fastener presses the elastic component, the elastic component is compressed and undergoes elastic deformation. The extension part expands and extends and protrudes to one side. The extension part protrudes or changes shape when extending to the outside or inside of the insulating component, directly or indirectly presenting the fastening state of the fastener.
[0043] In some embodiments, the elastic element is a spring sheet, the spring sheet is H-shaped, the spring sheet has a hole in the middle, and both ends of the spring sheet have symmetrically distributed and downwardly bent arms, at least one of the arms being an extension. The spring sheet is sleeved on the fastener through the middle hole, and both the upper and lower sides of the spring sheet abut against the fastener. When the fastener is tightened, the arms of the spring sheet are squeezed, the spring sheet is gradually unfolded, and the extension extends outward from the fastener.
[0044] In the above embodiment, the elastic element is H-shaped, with downwardly bent arms symmetrically distributed at both ends of the spring. The fastener compresses the bent arms to generate elastic deformation, providing a reverse elastic force to the fastener and increasing the friction between the fasteners to prevent loosening. At the same time, taking advantage of the characteristic that the bent arms flatten after being compressed by the fastener, the extension is set on the bent arms. The extension extends outward from the fastener as the flattening action occurs. When the tightening torque of the fastener reaches the rated torque, the extension is at its longest length. An indicator can also be set on the extension, and the operator can judge the tightness, looseness, or semi-tightness of the fastener based on the scale information or color information presented by the indicator.
[0045] In some embodiments, the elastic element is a spring sheet, the spring sheet is wavy, the spring sheet is disposed inside the fastener, and both its upper and lower ends abut against the fastener. A hole is provided on one side of the fastener. When the fastener is tightened, the spring sheet is squeezed and gradually unfolds, and the extension of the spring sheet extends outward from the hole on one side of the fastener.
[0046] In the above embodiments, the elastic element is a wave-shaped sheet-like spring plate disposed inside the fastener. A hole is provided on one side of the fastener. The upper and lower ends of the elastic element abut against the screw and pressure plate of the fastener. When the screw is tightened, the screw presses the spring plate against the pressure plate, causing it to undergo elastic deformation and extend. One side of the spring plate is an extension portion facing the hole on one side of the fastener. The fastener uses pressure on the spring plate to generate elastic deformation, providing a reverse elastic force to the fastener and increasing the friction between the fasteners to prevent loosening. When the tightening torque of the fastener reaches the rated torque, the length of the extension portion extending out of the hole on one side of the fastener is at its maximum. An indicator portion can also be provided on the extension portion, allowing the operator to determine the tightness, looseness, or partial tightness of the fastener based on the scale information or color information displayed by the indicator portion.
[0047] In some embodiments, the fastener includes at least a screw and a threaded hole that engages with the screw.
[0048] In the above embodiments, the fastener uses a screw and a threaded hole to cooperate. The threaded hole can be set on the conductive part or replaced by a nut. Alternatively, the threaded hole can be set on the fixing plate or the thread can be set on the fixing frame to achieve the fastening effect.
[0049] The beneficial effects of this invention are as follows:
[0050] 1. By setting up elastic elements, when the fastener fixes the external connecting conductor, the elastic elements provide a pressing force to it, while also providing a reverse elastic force and resistance to the fastener. This increases the friction between the threaded mating surface and the pressure contact surface of the fastener, which plays a role in preventing the screw from loosening. This avoids the fastener from loosening due to thermal expansion and contraction or electromagnetic vibration, and improves the reliability of installation and wiring.
[0051] 2. By setting an extension on the elastic element, the extension is displaced by the compression deformation of the elastic element under the pressure of the fastener, which directly or indirectly provides the operator with an indication of the tightness, making the operator's tightening operation easier and allowing the operator to more intuitively discover the tightness status, thus improving the operator's observation convenience.
[0052] 3. By using the elastic deformation of the elastic element after tightening and pressing to cause the extension to move and drive the indicator, the indicator shows the tightening state and degree of tightening to the outside of the insulating part, which facilitates the operator's tightening operation and judgment of whether loosening has occurred after long-term operation. This provides the operator with operational convenience and detectability for future inspections.
[0053] 4. By using an elastic element to generate elastic deformation under the pressure of the fastener, the extension part is displaced, which triggers a mechanical sound-generating device or an electric light-emitting device or an electric sound-generating device to generate sound or light signals. The operator can judge the tightness of the fastener based on the presence or absence and strength of the signal, so that the operator can more clearly understand the tightness. Attached Figure Description
[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0055] Figure 1 This is a schematic diagram of the electrical wiring terminal structure according to the first embodiment of the present invention;
[0056] Figure 2 This is a schematic diagram of the electrical wiring terminal structure according to the second embodiment of the present invention;
[0057] Figure 3 This is a schematic diagram of the electrical wiring terminal structure according to the third embodiment of the present invention;
[0058] Figure 4 This is a schematic diagram of the electrical wiring terminal according to the fourth embodiment of the present invention;
[0059] Figure 5 This is a schematic diagram of the electrical wiring terminal according to the fifth embodiment of the present invention;
[0060] Figure 6 This is a schematic diagram of the electrical wiring terminal according to the sixth embodiment of the present invention;
[0061] Figure 7 This is a schematic diagram of the electrical wiring terminal structure according to the seventh embodiment of the present invention;
[0062] Figure 8 This is a schematic diagram of the electrical wiring terminal of the eighth embodiment of the present invention;
[0063] Figure 9 This is a schematic diagram of the electrical wiring terminal structure according to the ninth embodiment of the present invention;
[0064] Figure 10 This is a schematic diagram of the electrical wiring terminal according to the tenth embodiment of the present invention;
[0065] Figure 11 This is a schematic diagram of the electrical wiring terminal according to the eleventh embodiment of the present invention;
[0066] Figure 12 This is a schematic diagram of the structure of the electrical terminals after the insulating component is hidden, according to the first embodiment of the present invention.
[0067] Figure 13 This is a schematic diagram of the extension and display section from the left-side perspective of the second embodiment of the present invention;
[0068] Figure 14 This is a partial top view of the eighth embodiment of the present invention;
[0069] Figure 15 This is a schematic diagram of the electrical wiring terminal according to the twelfth embodiment of the present invention;
[0070] Figure 16 This is a schematic diagram of the electrical wiring terminal structure according to the thirteenth embodiment of the present invention;
[0071] Figure 17 This is a schematic diagram of the electrical wiring terminals hidden behind the right-side fixing frame according to the thirteenth embodiment of the present invention;
[0072] Figure 18 This is a schematic diagram of the electrical terminal structure according to the fourteenth embodiment of the present invention;
[0073] Figure 19 This is a schematic diagram of the electrical terminal block after the fixing frame has been cut out according to the fourteenth embodiment of the present invention. Detailed Implementation
[0074] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific configurations and algorithms presented below, but covers any modifications, substitutions, and improvements to elements, components, and algorithms without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description in order to avoid unnecessarily obscuring the invention.
[0075] First Embodiment
[0076] According to the appendix Figure 1 and 12 As shown, this invention provides an electrical terminal block for connecting a switch or other electrical device or power distribution system to an external conductor. The terminal block includes an insulating component 10, an elastic component 30, a fastener 20, and a conductive component 40. In this embodiment, the fastener 20 includes a screw 21 and a fixing frame 22. The insulating component 10 has a receiving space, and the inner wall of the receiving space has a sliding groove. The fixing frame 22 is disposed within the receiving space and can slide up and down along the sliding groove. The fixing frame 22 is square-shaped and has a threaded hole at the top. The screw 21 can be screwed into the thread of the fixing frame 22 for engagement. The thread is a right-hand thread. When the screw 21 is turned clockwise, the fixing frame 22 slides upward under the drive of the screw 21 thread. When the bottom of the fixing frame 22 catches the external conductor 50, it pulls the external conductor 50 towards the bottom of the conductive component 40. When the fixing frame 22 stops sliding, the screw 21 begins to move downwards, pressing the elastic element to cause it to deform elastically and gradually complete the tightening. When the screw 21 is turned counterclockwise, the fixing frame 22 slides downwards under the drive of the screw 21 thread. The screw 21 moves upwards under the elastic force of the elastic element 30 and gradually completes the loosening. The conductor 40 is fixed inside the insulating element 10 and passes through the fixing frame 22. The elastic element 30 is provided above the conductor 40. The lower end of the screw 21 abuts against the upper part of the elastic element 30. The elastic element 30 is located between the screw 21 and the conductor 40. The extension direction of the elastic element 30 is approximately perpendicular to the screwing direction of the screw 21. Tightening clockwise is to screw the screw 21 downwards, which can compress the elastic element 30 to deform, causing at least one end of the elastic element 30 to extend outside the insulating element 10.
[0077] Specifically, the elastic element 20 has a wave-shaped spring sheet structure. The elastic element 30 undergoes elastic deformation under the pressure of the fastener 20. The elastic element 30 does not undergo elastic deformation when not under the pressure of the fastener 20. After undergoing elastic deformation under the pressure of the fastener 20, the elastic element 30 has an extension portion 31 extending to at least one side. After being pressed by the fastener 20, the elastic element 30 undergoes elastic deformation and flattens. The screw 21 presses against the top of the elastic element 30, and the two ends of the elastic element 30 abut against the conductive element 40. The extension portion 31 is driven by the flattening action of the elastic element 30. Extending to the left until it protrudes beyond the insulating component, the other side of the elastic element is provided with a fixing bending portion 32, which abuts against the insulating component 10. When the elastic element 30 is elastically deformed, only the extension portion 31 extends to the left, which can make the stroke of the extension portion 31 larger and the extension stroke more stable. When the fastener 20 is tightened, the elastic element is gradually deformed. The thrust generated after the torque of the screw 21 reaches the rated torque is just enough to overcome the pressure required for the elastic element 30 to be completely flattened. When the elastic element 30 is completely flattened, the extension portion 31 extends out of the insulating component 10 by about 1.5mm.
[0078] For example: If the screw is M7 and the required tightening torque is 3.5 Nm,
[0079] According to the screw preload formula:
[0080] F = T / kd
[0081] F: Axial force of the screw
[0082] T: Tightening torque
[0083] k: Torque coefficient 0.12~0.2
[0084] d: Thread size (m)
[0085] 3.5 (Nm) / 0.2 x 0.007 = 2500 N
[0086] The M7 screw generates a thrust of 2500N at a rated tightening torque of 3.5Nm.
[0087] The spring is designed based on the thrust generated when the screw is tightened:
[0088] The material selected is 1.2mm thick 301 stainless steel strip, calculated according to the spring force formula:
[0089] P = bH 3 Eδ / 4L 3
[0090] P: Spring force of the shrapnel (2580.9N)
[0091] b: Spring width (9.5mm)
[0092] H: Thickness of the spring plate (1.2mm)
[0093] E: Material elastic modulus (20000 kg / mm²) 2 )
[0094] δ: Shrapnel deformation (2.5mm)
[0095] L: Length of the spring lever arm (4.3mm)
[0096] Calculations show that the maximum stroke of the elastic element compressed by the screw is 2.5mm. The elastic force P2 of the elastic element is 2580.9N, which is equivalent to the thrust generated by the screw under the rated torque. This force is just enough to overcome the elastic force of the elastic element 30, so that the elastic element 30 is compressed to the maximum position without rebounding. At this moment, the extension 31 extends 1.5mm outward from the insulating part 10. If the screw 21 is loosened, the compression stroke of the screw 21 on the elastic element is halved to 1.25mm. The elastic force P1 generated by the elastic element 30 is 1290.45N. Then the extension 31 of the elastic element 30 will retract 0.75mm, and the size of the insulating part 10 exposed is 0.75mm.
[0097] The force signal of the elastic element 30 is transmitted by the extension portion 31 extending beyond the insulating member 10. The force of the elastic element 30 is fed back by the pressure of the fastener 20, indicating the degree of elastic deformation. The position of the extension portion 31 is affected by the degree of deformation, resulting in different displacements. In this embodiment, the force signal transmitted by the extension portion of the elastic element is a mechanical position indication signal. In actual operation, whether the screw 21 is tightened can be determined by the distance of the extension portion 31 protruding outside the insulating member 10. When the protruding length is less than 1.5mm, it indicates that the screw 21 is not tightened. For a clearer indication, this... In this embodiment, an indicator 311 is also provided at the end of the extension 31. In this embodiment, the indicator 311 is a color recognition part, which is a mark provided on the extension. By applying two different colors of paint, for example, dividing the 1.5mm extension into two equal parts, one part is painted yellow and the other red, when the extension 31 extends 0.75mm beyond the insulating member, the color recognition part displays yellow, indicating that it is not completely tightened. When the extension extends 1.5mm beyond the insulating member, the color recognition part displays both yellow and red, with the red display area... When the yellow area is larger than the yellow area, it indicates that the fastener is fully tightened. When the red area is smaller than the yellow area, it means that the fastener is not fully tightened or has become loose. The display can also be made using pad printing, laser marking, stamping, or other methods with scales, or by using colored or graduated stickers or parts fixed to the extension. This allows for direct assessment of the tightness during operation, eliminating the need for a torque wrench and facilitating easy and intuitive confirmation by inspectors. In future maintenance, if screw 21 becomes loose, it can be checked through the extension 31. The length, color, or scale of the insulating component 10 is used to determine whether the screw 21 is loose. The elastic force of the elastic component 30 acts on the conductive component 40, and the conductive component 40 then transmits the pressure to the external conductor 50, so that the external conductor 40 is firmly fixed between the fixing frame 22 and the conductive component 40. The elastic force generated by the elastic component 30 will also generate a reverse thrust on the threaded engagement of the screw 21 and the fixing frame 22, which will increase the friction between the fasteners 20, preventing the fasteners 20 from loosening due to electromagnetic vibration, thermal expansion and contraction, etc. during daily operation. It not only prevents loosening but also indicates the degree of tightness.
[0098] Second Embodiment
[0099] like Figure 2 and 13As shown, the present invention also provides an electrical terminal block of another specific embodiment. The difference from the first embodiment is that, in this embodiment, the extension of the elastic element directly or indirectly transmits a signal of the degree of compression of the elastic element outside the insulating element. The elastic element 30 is a spring, the spring is tower-shaped, and the top of the spring has an extension 31 that extends to the left to the outside of the insulating element 10. The top of the spring is fitted onto the lower end of the screw 21 of the fastener, and the bottom of the spring abuts against the conductive element 40. The external conductor 50 is disposed below the conductive element 40. The fastener 20 is a combination of the screw 21 and the fixing frame 22. The fixing frame 22 has a threaded hole. When the screw 21 is tightened, the fixing frame 22 will be pulled upwards, catching the external conductor 50 and pressing it against the conductive element 40. The screw 21 also compresses the spring while tightening. When the spring is compressed, the extension 31 moves downwards with the elastic deformation of the spring. The vertical height of the extension 31 indicates the tightness of the screw 21. To more clearly display the tightness, a display corresponding to the extension is provided on the outer surface of the insulating part. The display consists of scale lines and text prompts. When the extension 31 moves to the corresponding scale line, it indicates the tightness of the fastener 20. In this embodiment, torque information of 0 N.m, 1.5 Nm, and 3.5 Nm is used. The tightening torque of the fastener is indirectly reflected through the position and size information. The elastic force generated when the spring is fully compressed and coiled is equivalent to the thrust generated by the screw 21 under the rated torque. When the screw 21 is tightened, the extension 31 basically reaches the lowest limit position. When the screw 21 is loosened, the extension 31 will move upward. The vertical position of the extension 31 can be clearly observed on the outside of the insulating part 10. The tightness of the fastener 20 is more clearly displayed by setting scale lines and text information on the insulating part 10, which brings convenience to operation and maintenance.
[0100] Third Embodiment
[0101] like Figure 3As shown, the present invention provides an electrical terminal block according to a third specific embodiment. The difference from the second embodiment is that the extension 31 on the elastic member 30 faces inward towards the interior of the insulating member 10. An indicator 60, linked to the extension 31 of the elastic member 30, is provided inside the insulating member 10. The indicator 60 extends outward from the insulating member 10, and the portion of the indicator 60 extending outward from the insulating member is a display portion 601. The display portion 601 displays the tightness, looseness, or partial tightness of the fastener 20 outside the insulating member 10. The display portion 601 has two colors or scale lines. During the tightening process, the screw 21 presses against the elastic member. When the elastic element 30 is compressed downwards, the extension 31 moves downwards due to the compression and elastic deformation of the elastic element 30. The downward-moving extension 31 pushes the indicator 60 downwards, and the indicator 60 becomes flush with the outer surface of the insulating element 10. The display 601 does not display color information. Conversely, the display 601 of the indicator 60 protrudes from the outer surface of the insulating element 10 and displays different colors or scale lines to indicate the tightness of the fastener 20. The operator can judge the tightness of the fastener 20 by the color or scale information displayed by the display 601 protruding from the outer surface of the indicator 60, making it easier for the operator to observe and judge.
[0102] Fourth embodiment
[0103] like Figure 4 As shown, the present invention provides an electrical terminal block according to a fourth specific embodiment. The difference from the first embodiment is that a sound reed or metal sheet 70 is fixedly disposed within the insulating member 10. In this embodiment, the extension of the elastic member transmits the force signal of the elastic member as a mechanical sound signal. One end of the sound reed or metal sheet 70 is fixedly disposed on the conductive member 40, and the other end extends upward. A tongue is provided in the middle of the sound reed or metal sheet 70. When the elastic member 30 changes between a compressed state and / or a non-compressed state, the extension 31 triggers the tongue of the sound reed or metal sheet 70 to emit a sound. The elastic member 30 is a wavy spring. The fastener 20... The fastener 20 is a combination of screw 21 and fixing frame 22. When screw 21 is tightened, it presses down on elastic member 30 to cause elastic deformation. After elastic deformation, elastic member 30 will extend. Since there is a bending part 32 on the right side, the extension direction of elastic member 30 is to the left, causing the extension part 31 on the left side to extend to the left. When the fastener 20 is fully tightened, the extension part 31 will trigger the tongue of the sound reed or metal plate 70 to make a sound, so that the operator can clearly hear the prompt signal that the tightening is complete. Conversely, when the fastener 20 is loosened, elastic member 30 returns to its original shape, causing extension part 31 to retract to the left, thereby triggering the tongue of the sound reed or metal plate again to make a loosening prompt sound.
[0104] Fifth Embodiment
[0105] like Figure 5 As shown, the present invention provides an electrical terminal block according to a fifth specific embodiment. The difference from the fourth embodiment is that the elastic element 30 is a spring, the spring is tower-shaped, and the top of the spring is provided with an extension 31 extending to the left. The tongue of the sound reed or metal plate 70 is a bent structure. The extension 31 moves up and down with the tightening or loosening of the screw 21. During the up and down movement of the extension 31, it moves the tongue of the sound reed or metal plate 70 to make a sound prompt. When the screw 21 is tightened, the extension 31 moves down with the elastic element 30 and moves the tongue down to make a sound prompting the operator that the tightening is complete. When the screw 21 is loosened, the elastic element 30 will drive the extension 31 to move up and move the tongue up to make a sound prompting that the screw 21 has been loosened.
[0106] Sixth Embodiment
[0107] like Figure 6 As shown, the present invention provides an electrical terminal block according to a sixth specific embodiment. The difference from other embodiments is that the elastic element 30 is a spring bar, which is a U-shaped structure with an arc shape, an extension 31 at the opening, and a fixing part 32 at the bottom. The fastener 20 is a combination of a screw 21 and a nut 22. The screw 21 is fitted into the U-shape of the spring bar. The two ends of the opening of the spring bar abut against the conductive element 40 and the external conductor 50, and the fixing part 32 abuts against the insulating element 10. When the fastener 20 is tightened, the arc-shaped top of the spring bar is compressed, and the spring bar is gradually unfolded and straightened. The elastic force of the spring bar is applied to the conductive element 40 and the external conductor 50. When the screw 21 reaches the rated tightening torque, the spring bar is completely flattened. The extension 31 of the spring bar extends outward from the insulating element 10. The operator judges the tightness of the fastener 20 based on the size of the extension 31 extending outward from the insulating element 10.
[0108] Seventh Embodiment
[0109] like Figure 7As shown, the present invention provides an electrical terminal block according to a seventh specific embodiment. The difference from the first embodiment is that the elastic element 30 is a spring sheet, which is V-shaped and has an oblong hole 33 at its top. The fastener 20 is a combination of a screw 21 and a fixing frame 22. The end of the screw 21 is fitted into the oblong hole 33. The two ends of the spring sheet 30 abut against the conductive element 40. The right side is an extension 31, and the left side is a fixing part 32. The fixing part 32 abuts against the inner wall of the insulating element 10. When the fastener 20 is tightened, the top of the spring sheet is squeezed, and the spring sheet is gradually unfolded. The extension 31 extends outward from the insulating element 10. The purpose of setting the oblong hole is to make the elastic element 30 extend only to the right during the compression deformation process. The left side is the fixing part, which needs to make way through the oblong hole so that the extension distance of the elastic element extends to the right, making the extension distance of the extension 31 longer and the distance protruding outward from the insulating element 10 longer, which is more conducive to observation.
[0110] Eighth embodiment
[0111] like Figure 8 and 14 As shown, the present invention provides an electrical terminal block according to an eighth specific embodiment. The difference from other embodiments is that, in this embodiment, the extension of the elastic member transmits the force signal of the elastic member as an electrical light-emitting signal; a light-emitting device 80 is provided inside the insulating member 10, and the light-emitting device 80 is located on the left side of the elastic member 30. The light-emitting device 80 includes at least a trigger switch 81, a power supply unit 82, a light-emitting unit 83 and / or a display unit 84. The elastic member 30 is a spring sheet, which is wavy, with a bending portion 32 on the right side and an extension portion 31 on the left side. The trigger switch 31 is located near the protrusion of the extension portion 31. The elastic member 30 is in a state of being compressed by the screw 21. When the pressure state changes, the extension 31 triggers the trigger switch 81 of the light-emitting device 80. The trigger switch 81 can change the color, intensity, presence or absence of the light emitted by the light-emitting unit 83 according to the information such as the trigger stroke or force, or directly display text information, or transmit the light signal to the outside of the insulating part 10 through the display part 84 so that the operator can clearly see the intensity, color, presence or absence of the light or the light-emitting text symbols, and judge the tightness, looseness or semi-tightness of the fastener 20. The display part 84 is a light-conducting component or a protective component of the light-emitting unit. The light-emitting unit 83 can be a light-emitting diode, liquid crystal display screen or digital tube, etc.
[0112] Ninth Embodiment
[0113] like Figure 9As shown, the present invention provides an electrical terminal block according to a ninth specific embodiment. The difference from the eighth embodiment is that, in this embodiment, the extension of the elastic member transmits the force signal of the elastic member as an electrical sound signal. A sound-generating device 90 is provided within the insulating member. The sound-generating device 90 includes at least a trigger switch 91, a power supply unit 92, and a sound-generating unit 93. The elastic member 30 is a spring sheet, which is wavy, with a bending portion 32 on the right side and an extension portion 31 on the left side. When the elastic member 30 is in a state of compression by the screw 21 or / and a state of non-compression, the extension portion 31 triggers the sound-generating device. The trigger switch 91 of the 80 can change the volume and frequency of the sound-emitting unit 93 according to the information such as the trigger stroke or force, and then transmit it to the outside of the insulating part 10 in the form of sound waves so that the operator can hear it and judge the tightness, looseness or semi-tightness of the fastener 20. The sound-emitting unit 93 is a sound-emitting device such as a buzzer or electric horn. When a buzzer is used, the sound wave signal of the fastener tightness can be transmitted according to the change of the volume or interruption of the sound. When an electric horn is used, richer prompts such as voice prompts can be transmitted to transmit the sound wave signal of the fastener tightness.
[0114] Tenth Embodiment
[0115] like Figure 10 As shown, the present invention provides an electrical terminal block according to a tenth specific embodiment. The difference from other embodiments is that the elastic element 30 is a spring sheet, the conductive element 40 has two layers, the spring sheet is wavy and disposed between the two layers of conductive element 40, the fastener 20 is a combination of a screw 21 and a fixing frame 22, the fixing frame 22 has a threaded hole, the end of the screw 21 has a pressure plate 211, the external conductor 50 can be arbitrarily connected at the upper or lower position of the two layers of conductive element 40, and when the screw 21 is tightened, the fixing frame... 22 moves upward, and screw 21 and pressure plate 211 move downward, clamping and fastening the external conductors of the two conductive parts 40. When screw 21 is tightened to the rated torque, the pressure generated by screw 21 just overcomes the elastic force of the spring piece. The spring piece is squeezed and gradually unfolded. The left side of the spring piece is the fixing part 32, and the right side is the extension part 31. The extension part 31 of the spring piece extends outward of the insulating part 10, so that the operator can judge the degree of tightening based on the length of the extension part 31 extending outward of the insulating part 10, making the operation and judgment visual.
[0116] Eleventh Embodiment
[0117] like Figure 11As shown, the present invention provides an electrical terminal block according to an eleventh specific embodiment. The difference from other embodiments is that the elastic element 30 is a spring block, which is made of non-metallic material, such as rubber or polyurethane, and has a block-shaped structure. The spring block is disposed between the fastener 20 and the conductive element 40. The fastener 20 is a combination of a screw 21 and a fixing frame 22. A pad 23 is provided between the screw 21 and the spring block. The pad 23 increases the pressure-bearing area of the spring block, preventing expansion of the spring block around the pressure application point of the screw 21 and affecting the expansion degree of the extension 31. The pad 23 enables... The extension 31 expands to a greater extent and exhibits a greater change in shape, making it easier to observe or transmit signals. One side of the spring block is the extension 31, and the other side is the fixing part 32. The fixing part 32 abuts against the insulating member 10, and the extension 31 faces outward from the insulating member 10. An opening is provided in the insulating member 10 at the position of the extension direction of the extension 31, so that the extension of the extension 31 is not restricted. When the fastener 20 is tightened, the spring block is squeezed, and the extension 31 of the spring block protrudes outward from the insulating member 10, expands, or changes shape, directly presenting the tightened state of the fastener 20 to the outside of the insulating member 10.
[0118] Twelfth Embodiment
[0119] like Figure 15As shown, the present invention provides an electrical terminal block according to a twelfth specific embodiment. The difference from other embodiments is that the elastic member 30 is a spring sheet structure, with a bending portion 32 on the right side, the bending portion 32 being fixed to the inner wall of the insulating member, and an extension portion 31 on the left side facing the interior of the insulating member 10. An indicator 60, which is linked to the extension portion 31 of the elastic member 30, is provided inside the insulating member 10. The indicator 60 extends towards the upper edge of the insulating member 10, and an opening is provided at the upper edge of the insulating member. The indicator 60 is connected to the insulating member 10. The insulating member 10 is rotatably configured. The indicator 60 extends to the edge of the insulating member to form a display section 601. The display section 601 consists of three arc-shaped steps, each with a different color: the first arc-shaped step is green, the second is yellow, and the third is red. An elastic part 602 is located on the right side of the indicator 60. The elastic part 602 abuts against the inner wall of the insulating member 10, causing the lower end of the indicator 60 to fit against the extension 31 of the elastic member 30. When the fastener 20 is not tightened, the elastic part... Before the extension of the component extends to the left, the display portion 601 of the indicator 60 is green at the opening on the upper edge of the insulating component, forming a first arc-shaped step surface. When the fastener 20 is tightened, the extension portion 31 of the elastic component 30 extends to the left, pushing the lower end of the indicator 60, causing the indicator to rotate clockwise against the elastic force of the elastic portion 602. The display portion 601 also rotates accordingly, and the green portion of the first arc-shaped step surface of the display portion 601 shifts to the right, gradually offsetting the opening of the insulating component 10. The second arc-shaped step surface of the display portion... The yellow color gradually appears inside the opening of the insulating member 10. When the fastener reaches the predetermined tightening torque, the extension 31 extends to the left to the maximum position. The lower end of the indicator 60 is pushed to the maximum position by the extension 31. The display 601 also rotates clockwise until the third arc step face is aligned with the opening on the upper edge of the insulating member 10. The color displayed at the opening is red, indicating that the fastener has been tightened. This allows the operator to observe and judge the tightness, looseness, and semi-tightness of the fastener based on the color displayed at the opening.
[0120] Thirteenth Embodiment
[0121] like Figure 16 and 17As shown, the present invention provides an electrical terminal block according to a thirteenth specific embodiment. This electrical terminal block is used for fixed connection of busbars or branch circuit splitting in a power distribution system. The difference from other embodiments is that the electrical terminal block is an independent terminal block without insulation support. The terminal block includes fasteners, an elastic element 30, and a conductive element 40. The fasteners include two movable fixing frames 23, a nut piece 22, a headless screw 21 with a pressure ring at the end, and a leaf spring 25 abutting between the two fixing frames. The conductive plate 24 has an elastic element 30 that is an H-shaped spring with a hole in the middle. Both ends of the spring have symmetrically distributed, downwardly bent arms. The spring is fitted onto the screw 21 and the nut piece 22 through the hole in the middle. The spring 30 abuts against the top of the nut piece 22 and the fixing frame 23. At least one of the four bent arms is an extension 31. When the elastic element 30 is not compressed, the extension 31 is located at the edge of the fixing frame 23 and does not protrude outside the fixing frame 23.
[0122] The bottom of the fixed frame 23 has a hook-shaped structure, and above the hook-shaped structure is a vertically movable space for the conductive element 24. Above the movable space is a semi-circular hole or semi-circular protrusion for hinged engagement. The two fixed frames 23 can rotate relative to each other after being hinged through the semi-circular hole and semi-circular protrusion. The top of the two fixed frames 23 has a protruding operating part, and the inner side of the operating part has a rectangular hole. The leaf spring 25 is sheet-shaped, with bending arms on both sides and a screw through hole in the middle. The leaf spring 25 supports the nut piece 22, the elastic element 30, and the screw 21, hanging them on the top of the two fixed frames 23. At the same time, under the action of the bending arms on both sides of the leaf spring, the fixed frames 23 form an expanding clamp structure. By squeezing the two fixed frames... The operating part of 23 has a hook-shaped structure at the bottom of the fixed frame that opens to engage the conductive component 40. A voltage-conducting plate 24 is placed above the conductive component 40, and then an external conductor 50 is inserted from one side. By tightening the screw 21, the screw 21 extends downward, and the pressure ring on it presses the external conductor 40, the voltage-conducting plate 24, and the conductive component 40 together against the hook-shaped structure of the fixed frame 23. At the same time, the nut plate 22 also presses the spring piece against the top of the fixed frame 23. When the tightening torque of the screw 21 reaches the preset torque, the screw 21 and the nut plate 22 are fastened together, and the four arms at both ends of the spring piece are compressed, and the spring piece is gradually unfolded. The extensions 31 of the arms all extend outward from the edge of the fixed frame 23 and are exposed for a certain length.
[0123] The extension 31 has an indicator section on its surface, which consists of three scale lines. When the screw 21 is tightened to the predetermined tightening torque, the third scale line of the indicator section on the extension 31 is flush with the edge of the fixing frame 23. When the screw 21 is not tightened or becomes loose, the third scale line of the indicator section 311 will retract into the edge of the fixing frame 23 and become invisible. The indicator section 311 can directly reflect the tightness of the fastener, and can also indirectly reflect the tightening torque or preload of the fastener through the scale lines, so that the operator can clearly judge whether the tightening is in place, and can also clearly judge whether the fastener has become loose during future maintenance.
[0124] Fourteenth Embodiment
[0125] like Figure 18 and 19 As shown, the present invention provides an electrical terminal block according to the fourteenth specific embodiment. The electrical terminal block is used for fixed connection of busbars or branch circuit splitting in a power distribution system. The electrical terminal block is an independent terminal block without insulation support. The electrical terminal block includes fasteners, elastic elements 30, and conductive elements 40. The fasteners include screws 21, fixing frames 22, pressure plates 24, and leaf springs 25. The fixing frame 22 has an n-shaped structure with a threaded hole at the top and a through slot on one side to accommodate the conductive element 40. The pressure plate 24 is U-shaped and fastened to the top of the inner side of the fixing frame 22. An elastic element 30 is provided in the space formed after the fixing frame 22 and the pressure plate 24 are fastened together. A conductive element 40 is inserted into a through groove on one side of the fixing frame. A leaf spring 25 is provided under the fixing frame 22, and the leaf spring 25 presses upward against the conductive element 40 so that the entire electrical terminal can be secured to the conductive element 40. The external conductor 50 is inserted from one side of the n-shaped opening of the fixing frame 22 and is positioned between the conductive element 40 and the pressure plate 24. The elastic element 30... The spring is wavy and rests between the screw 21 and the pressure plate 24. The pressure plate 24 has a hole on one side. When the screw 21 is tightened, the spring is compressed and gradually unfolds. The extension 31 of the spring extends outward from the hole on one side of the pressure plate 24 and protrudes a certain length. The surface of the extension 31 has an indicator 311 with three scale lines. When the tightening torque of the screw 21 reaches a predetermined tightening torque, the indicator 311 on the extension 31... The third scale line is flush with the edge of the hole on one side of the pressure plate 24. When the screw 21 is not tightened or becomes loose, the third scale line of the indicator 311 will retract into the edge of the hole on one side of the pressure plate 24 and become invisible. The indicator 311 can directly reflect the tightness of the fastener, and at the same time, it can indirectly reflect the tightening torque or preload of the fastener through the scale line, so that the operator can clearly judge whether the tightening is in place, and can also clearly judge whether the fastener has become loose during future maintenance.
[0126] This invention may be implemented in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be regarded in all respects as exemplary rather than limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and all modifications falling within the meaning of the claims and their equivalents are thus included within the scope of the invention.
Claims
1. An electrical terminal block, the terminal block comprising at least an elastic element, a fastener, and a conductive element, wherein the elastic element is directly or indirectly disposed between the fastener and / or the conductive element, the elastic element undergoes elastic deformation under the pressure of the fastener, the elastic element does not undergo elastic deformation when not under the pressure of the fastener, and the elastic element, after undergoing elastic deformation under the pressure of the fastener, has an extension extending to at least one side, the extension directly or indirectly transmitting a signal of the force value or degree of compression of the elastic element.
2. An electrical terminal block according to claim 1, characterized in that, The terminal block also includes an insulating component, and the elastic component, fastener, and conductive component are disposed on the insulating component. The extension directly or indirectly transmits the force value or degree of compression of the elastic component inside or / and outside the insulating component.
3. An electrical terminal block according to claim 1, characterized in that, The elastic element is fed back by the pressure distance of the fastener, which reflects the size of the elastic deformation. The larger the deformation size of the elastic element, the greater the released elastic force and the greater the displacement of the extension. When the P1 or P2 value of the elastic element is constant, the displacement size of the extension is also constant.
4. An electrical terminal block according to claim 1, characterized in that, The elastic element is not compressed by the fastener, and the extension directly or indirectly transmits a signal of zero force or no compression of the elastic element inside or / and outside the insulation, or does not transmit a signal.
5. An electrical terminal block according to claim 1, characterized in that, The elastic element is any one of springs, sheet springs, spring bars, and spring blocks, or any combination thereof.
6. An electrical terminal block according to claim 1, characterized in that, The signal transmitted by the extension of the elastic element to the force value or degree of compression of the elastic element is any one or any combination of mechanical position indication signal, mechanical sound signal, electric light signal, and electric sound signal.
7. An electrical terminal block according to claim 1, characterized in that, The pressure of the elastic element acts on the conductor and / or directly or indirectly on the insulator.
8. An electrical terminal block according to claim 1, characterized in that, When the elastic element is in a non-compressed state, the extension directly or indirectly indicates a signal that the fastener is not tightened, either inside or outside the insulating element.
9. An electrical terminal block according to claim 1, characterized in that, When the elastic element is pressed by the fastener, the extension extends directly outward from the insulation element or changes position outside the insulation element, indicating that the fastener is in a tight or semi-tight state.
10. An electrical terminal block according to claim 1, characterized in that, The extension of the elastic element is provided with an indicator that is linked to it. The indicator shows the tightness, looseness or semi-tightness of the fastener to the outside of the insulating element.
11. An electrical terminal block according to claim 9 or 10, characterized in that, The extension and / or indicator and / or insulating part are provided directly or indirectly with an indicator for indicating the tightness, looseness or semi-tightness of the fastener, and the information presented by the indicator is at least a color recognition part and / or scale and / or text.
12. An electrical terminal block according to claim 1, characterized in that, An acoustic reed or metal sheet is fixedly installed inside the insulating component. When the elastic component changes between a compressed state and / or a non-compressed state, the extension triggers the acoustic reed or metal sheet to emit a sound.
13. An electrical terminal block according to claim 1, characterized in that, The insulating component is provided with an electric light-emitting device and / or an electric sound-emitting device. When the elastic component changes between a compressed state and / or a non-compressed state, the extension directly or indirectly triggers the electric light-emitting device and / or the electric sound-emitting device to provide feedback on the fastener's tightness, looseness, or semi-tightness through light or / or sound.
14. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring sheet, which is arranged in a wave shape between two conductive elements. When the fastener is tightened, the spring sheet is squeezed and gradually unfolded, with the extension of the spring sheet extending into or out of the insulating element.
15. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring sheet, which is wavy. The fastener presses the top of the spring sheet, and the two ends of the spring sheet abut against the conductive element. One side of the spring sheet has a bent portion, and the other side has an extension portion. The bent portion abuts against the insulating element. When the fastener is tightened, the top is squeezed, causing the spring sheet to gradually unfold. The extension portion of the spring sheet extends outward from the insulating element.
16. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring sheet, which is V-shaped and has a round hole, rectangular hole or oval hole at its top. The fastener is fitted into the round hole, rectangular hole or oval hole. The two ends of the spring sheet abut against the conductive element, and at least one side is an extension. When the fastener is tightened, the top of the spring sheet is squeezed and the spring sheet is gradually unfolded. At least one side of the extension extends to the outside or inside of the insulating element.
17. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring, which is tower-shaped. The top of the spring has an extension that extends to the outside of the insulating element. The top of the spring is fitted onto a fastener, and the bottom of the spring abuts against a conductive element. When the fastener is tightened, the spring is compressed, and the extension moves up and down with the elastic deformation of the spring.
18. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring bar, which is a U-shaped structure with an arc shape, an extension at the opening, and a fixing part at the bottom. The fastener is fitted into the U-shape. The two ends of the spring bar abut against the conductive element, and the fixing part abuts against the insulating element. When the fastener is tightened, the arc-shaped top of the spring bar is squeezed, and the spring bar is gradually unfolded. The extension of the spring bar extends to the outside or inside of the insulating element.
19. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring block, which is made of non-metallic material and is block-shaped. The spring block is disposed between the fastener and the conductive element, with an extension on one side and a fixing part on the other side. The fixing part abuts against the insulating element, and the extension part faces outward of the insulating element. When the fastener is tightened, the spring block is squeezed, and the extension part of the spring block protrudes outward of the insulating element.
20. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring sheet, which is H-shaped and has a hole in the middle. Both ends of the spring sheet have symmetrically distributed, downwardly bent arms, at least one of which is an extension. The spring sheet is fitted onto the fastener through the middle hole, and both the upper and lower sides of the spring sheet abut against the fastener. When the fastener is tightened, the arms of the spring sheet are compressed, and the spring sheet is gradually unfolded, with the extension extending outward from the fastener.
21. An electrical terminal block according to claim 5, characterized in that, The elastic element is a spring sheet, which is wavy and is disposed inside the fastener. Both the upper and lower ends of the spring sheet abut against the fastener. A hole is provided on one side of the fastener. When the fastener is tightened, the spring sheet is squeezed and gradually unfolds. The extension of the spring sheet extends outward from the hole on one side of the fastener.
22. An electrical terminal block according to claim 1, characterized in that, The fastener includes at least a screw and a threaded hole that mates with the screw.