Magnetic circuit section and high-voltage DC relay where the initial electromagnetic attraction force is enhanced.

Abstract

To provide a magnetic path part having an enhanced initial electromagnetic attraction force.SOLUTION: A magnetic path part of the present invention includes a coil, a movable magnetizer and a static magnetizer. The coil, the movable magnetizer and the static magnetizer are installed at the matched positions respectively, so that the magnetic pole face of the movable magnetizer and the magnetic pole face of the static magnetizer are located at the opposite positions with a predetermined magnetic gap. One of the two magnetic pole faces is provided with a protruding part protruding towards the direction of the other magnetic pole face, and the other magnetic pole face is provided with a recessed part capable of enabling the protruding part of one magnetic pole face to be embedded when the movable magnetizer and the static magnetizer attract each other, at a position corresponding to the protruding part. The present invention can achieve an enhanced initial electromagnetic attraction force with an equivalent coil volume and power consumption, or can achieve a reduced coil volume and a reduced coil power consumption with an equivalent initial electromagnetic attraction force.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS The present invention claims priority to Chinese patent applications filed on July 9, 2021 with application numbers 202110779803.1, 202110780418.9 and 202121565706.4, the entire contents of all these Chinese patent applications are incorporated herein by reference in their entirety.

[0002] The present invention relates to the technical field of relays, and in particular relates to a magnetic circuit part with enhanced initial electromagnetic attraction force and a high-voltage DC relay. BACKGROUND ART

[0003] A relay is an electronic control device, which has a control system (also called an input circuit) and a controlled system (also called an output circuit), and is usually applied to automatic control circuits. In practice, it is an automatic switch that controls a large current with a small current, so it plays roles such as automatic adjustment, safety protection and circuit conversion in electrical circuits. A high-voltage DC relay is a relay with the capability of handling high power, and has characteristics such as unmatched reliability and long service life compared with conventional relays even under harsh conditions such as high voltage and large current, and is widely applied in various fields such as the field of new energy vehicles.

[0004] On the one hand, as the demand for longer driving range in new energy vehicles increases, battery capacity also increases, leading to higher short-circuit currents when the battery pack short-circuits. This requires high short-circuit resistance in high-voltage DC relays. At the same time, there is a demand for increasingly lower power consumption in high-voltage DC relays to reduce energy loss. As the passenger space requirements for new energy vehicles increase, the volume requirements for high-voltage DC relays also decrease. In general, high-voltage DC relays applied in fields such as new energy vehicles are required to have strong electromagnetic attraction, low driving power consumption, and small volume. However, in conventional technology, the strong electromagnetic attraction required for short-circuit resistance necessitates a large coil winding space and high coil driving power consumption in the relay. This contradicts the requirements for small volume and low power consumption in high-voltage DC relays, and has affected the application of conventional high-voltage DC relays in fields such as new energy vehicles. [Overview of the project]

[0005] The object of the present invention is to overcome the shortcomings of the prior art and provide a magnetic circuit section and a high-voltage DC relay that enhance the initial electromagnetic attractive force. By improving the structure, it is possible to enhance the initial electromagnetic attractive force with equivalent coil volume and power consumption, or to reduce the coil volume and reduce coil power consumption while maintaining equivalent initial electromagnetic attractive force.

[0006] The present invention provides a magnetic path portion that enhances the initial electromagnetic attraction force, comprising a coil, a movable conduit, a return spring, and a stationary conduit, wherein the coil, the movable conduit, and the stationary conduit are each mounted in a suitable position, the magnetic pole surface of the movable conduit and the magnetic pole surface of the stationary conduit are located in opposing positions with a predetermined magnetic gap, the coil moves the movable conduit to the stationary conduit when energized, the return spring is provided between the central part of the movable conduit and the central part of the stationary conduit, and the two correspondingly provided magnetic pole surfaces exhibit an annular shape, where of the two magnetic pole surfaces One pole surface is provided with a protrusion that projects toward the other pole surface, and the other pole surface is provided with a recess at a position corresponding to the protrusion, into which the movable conduit and the stationary conduit are attracted to each other and the protrusion fits, and a certain distance is provided from the protrusion and recess to the annular inner and outer rings of the corresponding pole surface, and when the coil is energized between the protrusion and the recess, the direction of the resultant force of the attractive forces on both sides generated in the longitudinal cross-section where the protrusion fits into the recess is always along the direction of movement of the movable conduit toward the stationary conduit, and by using the protrusion to reduce the magnetic gap between the two pole surfaces at the position of the protrusion, the magnetic resistance is reduced and the initial electromagnetic attractive force is increased.

[0007] In one embodiment of the present invention, the upper surface of the protrusion is flat, and when the protrusion is fully fitted into the recess, the gap between all sides of the protrusion and the corresponding side wall of the recess is exactly the same, so that the direction of the resultant force of the attractive force generated when the coil is energized between the protrusion and the recess is always along the direction of movement of the movable conduit toward the stationary conduit. In one embodiment of the present invention, the distance from the side edge of the upper surface of the convex portion to the side edge of the corresponding recess opening of the concave portion is smaller than a predetermined magnetic gap between the two magnetic pole surfaces. In one embodiment of the present invention, when the protrusion is fully fitted into the recess, the gap between the side surface of the protrusion and the side wall of the recess is greater than or equal to the distance from the top surface of the protrusion to the bottom surface of the recess, and the distance from the top surface of the protrusion to the bottom surface of the recess is greater than or equal to the distance between the two magnetic pole surfaces.

[0008] In one embodiment of the present invention, the side surface of the protrusion is a combination of one or more of a vertical surface, an inclined surface, and a curved surface, and the side surfaces of both sides of the protrusion are symmetrical in a longitudinal cross-section.

[0009] In one embodiment of the present invention, the convex portion of one magnetic pole surface is one or more, and the concave portion of the other magnetic pole surface is one or more at corresponding positions.

[0010] In one embodiment of the present invention, the protrusion is a separate component and is fixed to the magnetic pole surface.

[0011] In one embodiment of the present invention, the protrusion is an integral structure formed on the magnetic pole surface.

[0012] In one embodiment of the present invention, the convex portion has a convex axial shape.

[0013] In one embodiment of the present invention, the protrusions are striped.

[0014] In one embodiment of the present invention, the convex portion is linear, arc-shaped, or annular.

[0015] In one embodiment of the present invention, the sum of the upper surface areas of all the protrusions on the magnetic pole surface is smaller than the remaining area after all the protrusions on the magnetic pole surface have been removed.

[0016] In one embodiment of the present invention, one of the magnetic pole surfaces is provided on a movable magnetoconduct, and the other magnetic pole surface is provided on a stationary magnetoconduct.

[0017] In one embodiment of the present invention, the movable magnetic conduit is a movable iron core, and the stationary magnetic conduit is a fixed iron core or a yoke plate.

[0018] Another aspect of the present invention provides a high-voltage DC relay that includes a magnetic path portion that enhances the initial electromagnetic attraction force.

[0019] Compared to the prior art, the beneficial effects of the present invention are as follows:

[0020] The present invention provides a convex portion on one of two pole surfaces that protrudes toward the other pole surface, and a recess on the other pole surface at a position corresponding to the convex portion, into which a movable conduit and a stationary conduit are attracted to each other and the convex portion can be fitted. The direction of the resultant force of the attractive force generated when the coil between the convex portion and the recess is energized is always along the direction in which the movable conduit moves toward the stationary conduit, resulting in a greater attractive force. This configuration of the present invention reduces the magnetic gap between the two pole surfaces at the position of the convex portion by utilizing the convex portion of one of the two pole surfaces, thereby reducing magnetoresistance and increasing the initial electromagnetic attractive force, or reducing the coil volume and reducing coil power consumption with an equivalent initial electromagnetic attractive force. The present invention can ensure attraction at a predetermined position between the two pole surfaces by using the recess of the other pole surface in cooperation with the convex portion of one pole surface.

[0021] The present invention will be described in further detail below based on the attached drawings and embodiments. However, the magnetic path portion and high-voltage DC relay that enhance the initial electromagnetic attraction force of the present invention are not limited to the embodiments. [Brief explanation of the drawing]

[0022] The above and other features and advantages of the present invention will become more apparent by describing exemplary embodiments in detail with reference to the drawings. [Figure 1] This is an exploded perspective view of Embodiment 1 of the magnetic path portion that enhances the initial electromagnetic attraction force of the present invention. [Figure 2]This is a cross-sectional view of the magnetic path portion shown in Figure 1 (state before coil energization). [Figure 3] This is an enlarged view of location A in Figure 2. [Figure 4] This is a cross-sectional view of the magnetic path portion shown in Figure 1 (state where the movable iron core has moved to a predetermined position after coil energization). [Figure 5] This is an enlarged view of location B in Figure 4. [Figure 6] This is a cross-sectional view of the movable iron core in the magnetic path portion shown in Figure 1. [Figure 7] This is a schematic diagram of the relationship between the magnetic gap and attraction force / reaction force in the magnetic path portion shown in Figure 1. [Figure 8] This is a cross-sectional view of the movable iron core of the second embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 9] This is a perspective view of the movable iron core of the third embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 10] This is a perspective view of the movable iron core of the fourth embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 11] This is a perspective view of the movable iron core of the fifth embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 12] This is a cross-sectional view of Figure 11. [Figure 13] This is a perspective view of the movable iron core of the sixth embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 14] This is a cross-sectional view of the movable iron core of the seventh embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 15] This is a perspective view of the movable iron core of the eighth embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 16] This is an exploded perspective view of the ninth embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 17] This is a cross-sectional view of Figure 16 (state before coil energization). [Figure 18] This is an exploded perspective view of the tenth embodiment of the magnetic path portion with enhanced initial electromagnetic attraction force according to the present invention. [Figure 19] This is a cross-sectional view of Figure 18 (state before coil energization). [Figure 20] This is a perspective exploded view of Embodiment 11 of the magnetic circuit portion that enhances the initial electromagnetic attraction force of the present invention. [Figure 21] Figure 20 is a cross-sectional view (before the coil is energized). [Figure 22] This is a cross-sectional view of the movable core of one embodiment of the linear magnetic circuit portion of the present invention. [Figure 23] This is a cross-sectional view of the movable core of another embodiment of the linear magnetic circuit portion of the present invention. [Figure 24] This is a cross-sectional view of one embodiment of the magnetic circuit portion of the present invention that can improve the initial electromagnetic attractive force. [Figure 25] Figure 24 is an exploded perspective view of the magnetic circuit section. [Figure 26] This is a magnified view of area C in Figure 24. [Figure 27] Figure 24 is a schematic diagram illustrating the relationship between the magnetic gap and attractive / reaction forces in the magnetic path portion. [Figure 28] This is a cross-sectional view of Embodiment Two of the magnetic circuit portion that can improve the initial electromagnetic attractive force of the present invention. [Figure 29] Figure 28 is a perspective exploded view of the second embodiment of the magnetic circuit portion shown. [Figure 30] This is a cross-sectional view of Embodiment 3 of the magnetic circuit portion that can improve the initial electromagnetic attractive force of the present invention. [Figure 31] Figure 30 is a perspective exploded view of the magnetic circuit portion of Embodiment 3. [Figure 32] This is a cross-sectional view of Embodiment 4 of the magnetic path portion that can improve the initial electromagnetic attraction force of the present invention. [Figure 33] Figure 32 is a perspective exploded view of the magnetic circuit portion of Embodiment 4 shown. [Figure 34] This is a cross-sectional view of Embodiment 5 of the magnetic circuit portion that can improve the initial electromagnetic attractive force of the present invention. [Figure 35] Figure 34 is a perspective exploded view of Embodiment 5 of the magnetic circuit portion, which can improve the initial electromagnetic attraction force. [Figure 36] This is a magnified view of area D in Figure 35. [Figure 37]This is a cross-sectional view of Embodiment 6 of the magnetic circuit portion of the present invention. [Figure 38] Figure 37 is a perspective exploded view of Embodiment 6 of the magnetic circuit portion shown. [Modes for carrying out the invention]

[0023] Next, exemplary embodiments will be described in more detail with reference to the drawings. However, exemplary embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein. In this specification, relative terms such as “top” and “bottom” are used to describe the relative relationship of one component of an icon to other components, but these terms are used in this specification only in the direction following the example shown in the drawings, for example, for convenience. If the device of the icon is inverted upside down, it can be understood that the component described as “top” becomes the component that is “bottom.” Other relative terms, such as “top” and “bottom,” are said to have similar meanings. When a structure is “top” another structure, it may mean that the structure is integrally formed with the other structure, that the structure is installed “directly” on the other structure, or that the structure is installed “indirectly” on the other structure.

[0024] The terms “one,” “one,” “that,” and “the aforementioned” are used to indicate the presence of one or more elements / components / etc. The terms “includes” and “have” are used to mean open inclusion and refer to elements / components / etc. that may exist in addition to the listed elements / components / etc. The terms “first,” “second,” etc. are used solely as markers and do not imply a quantitative limitation of the subject.

[0025] Example 1 of a magnetic circuit section that enhances the initial electromagnetic attraction force As shown in Figures 1 to 6, the magnetic path portion of the present invention that enhances the initial electromagnetic attraction force includes a coil 1, a movable conduit 2, a return spring 41, and a stationary conduit 3. The coil 1, the movable conduit 2, and the stationary conduit 3 are each mounted in a suitable position, so that the pole surface 21 of the movable conduit 2 and the pole surface 31 of the stationary conduit 3 are located opposite each other with a predetermined magnetic gap, so that when the coil 1 is energized, the movable conduit 2 is attracted to the stationary conduit 3, and the return spring 41 is provided between the central part of the movable conduit 2 and the central part of the stationary conduit 3, so that the two correspondingly provided pole surfaces have an annular shape, that is, the pole surface 21 of the movable conduit 2 is annular, and the pole surface 31 of the stationary conduit 3 is also annular. In this embodiment, the movable conduit 2 is a movable iron core, and a groove 22 for attaching a return spring 41 is provided in the middle. Because the groove 22 is in the middle on the surface of the movable iron core 2 facing the stationary conduit 3, the magnetic pole surface 21 of the movable iron core 2 is annular. The stationary conduit 3 is a yoke plate, and a groove 32 for attaching a return spring 41 is provided in the middle of the yoke plate 3. The magnetic pole surface 31 of the yoke plate 3 is an annular region whose position corresponds to the annular magnetic pole surface 21 of the movable iron core 2.

[0026] The magnetic path portion further includes a magnetic conduit cylinder 42 and a U-shaped yoke 43. The coil 1 is positioned in the U-shaped opening of the U-shaped yoke 43, and the magnetic conduit cylinder 42 is positioned in the intermediate through-hole of the coil 1, with its bottom end connected to the U-shaped yoke 43. The movable core 2 is movably positioned in the intermediate through-hole of the coil 1 and the intermediate through-hole of the magnetic conduit cylinder 42, and the upper end surface of the movable core 2 is a magnetic pole surface 21. The yoke plate 3 is attached to the upper end of the U-shaped yoke 43 and is positioned above the coil 1 and the movable core 2. A return spring 41 is installed between the movable core 2 and the yoke plate 3 to reset the movable core. The lower end surface of the yoke plate 3 is a magnetic pole surface 31, and when the coil 1 is energized, the movable core 2 moves upward and is attracted to the yoke plate 3.

[0027] In this embodiment, a protrusion 5 is provided on one of the two magnetic pole surfaces 21 and 31, the magnetic pole surface 21, which protrudes in the direction of the other magnetic pole surface 31. In this embodiment, the protrusion 5 is provided on the movable iron core 2, and the other magnetic pole surface 31 is provided with a recess 6 at a position corresponding to the protrusion 5, in which the movable iron core 2 and the yoke plate 3 are attracted to each other and the protrusion 5 can be fitted. In other words, the recess 6 is provided on the yoke plate 3, and a certain distance is provided from the protrusion 5 and recess 6 to the annular inner and outer rings of the corresponding magnetic pole surfaces.

[0028] Taking the movable core 2 as an example, there is a constant distance from the protrusion 5 of the movable core 2 to the inner ring 211 of the magnetic pole surface 21, and this distance can be set as needed. Similarly, there is a constant distance from the protrusion 5 of the movable core 2 to the outer ring 212 of the magnetic pole surface 21, and this distance can also be set as needed. In other words, the protrusion 5 of the movable core 2 cannot be positioned at the location of the inner ring 211 and the outer ring 212 of the magnetic pole surface 21. Furthermore, the direction of the resultant force of the two-sided attractive forces generated in the longitudinal cross-section (shown in Figures 3 and 5) that aligns with the protrusion 5 and recess 6 when the coil 1 is energized is always along the direction of movement of the movable core 2 toward the yoke plate 3. As a result, by using the protrusion 5 to reduce the magnetic gap between the two magnetic pole surfaces 21 and 31 at the protrusion position, magnetic resistance is reduced and the initial electromagnetic attractive force is increased.

[0029] In this embodiment, there is one convex portion 5 on the magnetic pole surface 21 of the movable iron core 2, and there is one concave portion 6 on the magnetic pole surface 31 of the yoke plate 3, located in a corresponding position.

[0030] In this embodiment, the protrusion 5 on the magnetic pole surface 21 of the movable iron core 2 is an integral structure formed on the magnetic pole surface 21 of the movable iron core 2.

[0031] In this embodiment, the protrusions 5 on the magnetic pole surface 21 of the movable iron core 2 are striped.

[0032] In this embodiment, the protrusion 5 on the magnetic pole surface 21 of the movable iron core 2 is annular in shape.

[0033] In this embodiment, the two opposing sides of the protrusion 5 on the magnetic pole surface 21 of the movable core 2 are both vertical surfaces, and in the longitudinal section (shown in Figures 3 and 5), the two sides of the protrusion 5 have a symmetrical structure.

[0034] As shown in Figures 3 and 5, in this embodiment, the upper surface 51 of the protrusion 5 is flat, and when the protrusion 5 is fitted into the recess 6, the gaps at each point between the side surface 52 of the protrusion 5 and the side wall 61 of the recess 6 are exactly the same. As a result, when the coil 1 is energized, the direction of the resultant force generated between the protrusion 5 and the recess 6 is always along the direction in which the movable core 2 moves toward the yoke plate 3.

[0035] In this embodiment, the area of ​​the upper surface of the protrusion 5 on the magnetic pole surface 21 of the movable core 2 is smaller than the remaining area of ​​the magnetic pole surface 21 of the movable core 2 after removing the protrusion 5.

[0036] In this embodiment, the protruding height of the convex portion 5 of the magnetic pole surface 21 of the movable iron core 2 is smaller than a predetermined magnetic gap between the two magnetic pole surfaces 21 and 31, and the distance from the side edge on the upper surface of the convex portion 5 to the side wall of the corresponding recess opening of the recess 6 is smaller than a predetermined magnetic gap between the two magnetic pole surfaces 21 and 31.

[0037] In this embodiment, with the convex portion 5 of the magnetic pole surface 21 of the movable iron core 2 fitted into the recess 6 of the magnetic pole surface 31 of the yoke plate 3, the gap between the side surface 52 of the convex portion 5 and the side wall 61 of the recess 6 is greater than or equal to the distance between the upper surface 51 of the convex portion 5 and the bottom surface 62 of the recess 6, and the distance from the upper surface 51 of the convex portion 5 to the bottom surface 62 of the recess 6 is greater than or equal to the distance between the two magnetic pole surfaces 21 and 31, thereby ensuring the holding force when attracted.

[0038] As shown in Figure 3, immediately after energizing coil 1, an attractive force is generated between the movable core 2 and the yoke plate 3. This attractive force includes attractive forces F1 and F2 between the two side edges of the protrusion 5 of the movable core 2 and the corresponding edges of the recess 6 of the yoke plate 3, attractive force F5 between the upper surface 51 of the protrusion 2 and the bottom surface 62 of the recess 6 of the yoke plate 3, and attractive forces F3 and F4 between the two magnetic pole surfaces 21 of the protrusion 5 and the two magnetic pole surfaces 31 of the recess 6.

[0039] At startup, the gaps at suction forces F1 and F2 are smaller than the gaps at suction forces F3, F4, and F5, while the gaps at suction forces F1 and F2 are larger. The gap at suction force F1 is equal to the gap at suction force F2, and the resultant force of suction forces F1 and F2 is aligned with the direction in which the movable iron core 2 moves toward the yoke plate 3. Because of the presence of suction forces F1 and F2, the initial electromagnetic attraction force is amplified.

[0040] From the time the magnetic path is activated until the magnetic pole surface 21 of the movable core 2 and the magnetic pole surface 31 of the yoke plate 3 are attracted to each other, the gaps in the attractive forces F1 and F2 are equal, the attractive forces are symmetrical, and the resultant force is still aligned in the direction in which the movable core 2 is attracted to the yoke plate 3. Furthermore, as the gaps in the attractive forces F3, F4, and F5 decrease, the attractive forces F3, F4, and F5 gradually increase and gradually play a major role. After the magnetic pole surface 21 of the movable core 2 and the magnetic pole surface 31 of the yoke plate 3 are attracted to each other and held in place, as shown in Figure 5, the attractive forces F3, F4, and F5 reach their maximum, the attractive forces F1 and F2 are small, and the resultant force of the attractive forces F1 and F2 is still aligned in the direction in which the movable core 2 is attracted to the yoke plate 3.

[0041] The high-voltage DC relay of the present invention includes a magnetic circuit portion that enhances the initial electromagnetic attraction force.

[0042] Referring to Figure 7, which shows the relationship between attractive force / reaction force and magnetic gap in the high-voltage DC relay of the present invention, curve 1 is the reaction force curve of the relay motion, curve 2 is the attractive force curve of a conventional relay, and curve 3 is the attractive force curve of the relay of the present invention. At the moment of relay startup, the magnetic gap is at its maximum, as shown on the right side of Figure 7 (i.e., 1.45 mm). At this time, assuming a drive voltage of 7 V is applied to the coil, the conventional technology generates an electromagnetic attractive force (right side of curve 2 in Figure 7). In the present invention, by providing a protrusion 5 in the movable iron core 2, the magnetic gap is reduced, the initial magnetic resistance is reduced, the initial attractive force is improved, and the startup power consumption is reduced. Although the drive voltage at this time is still 7 V, the generated electromagnetic attractive force is greater (right side of curve 3 in Figure 7). As can be seen from Figure 7, curves 2 and 3 intersect at a magnetic gap of 0.35 mm, and from a magnetic gap of 1.45 mm to 0.35 mm, the electromagnetic attractive force of the present invention is greater than that of the conventional technology. When generating the same electromagnetic attractive force as in conventional technology, only a smaller drive voltage is required, resulting in reduced drive power consumption. Since a recess 6 is provided on the magnetic pole surface 31 of the yoke plate 3 at a position corresponding to the protrusion 5 of the movable core 2, the magnetic pole continues to move in cooperation with the recess 6, so that the core is completely closed, that is, the magnetic pole surface 21 of the movable core 2 is attracted to the magnetic pole surface 31 of the yoke plate 3.

[0043] The magnetic circuit portion and high-voltage DC relay of the present invention, which enhance the initial electromagnetic attraction force, are provided with a protrusion 5 on the magnetic pole surface 21 of the movable core 2 that protrudes toward the magnetic pole surface 31 of the yoke plate 3, and the magnetic pole surface 31 of the yoke plate 3 is provided with a recess 6 at a position corresponding to the protrusion 5, into which the movable core 2 and the yoke plate 3 are attracted to each other and the protrusion 5 of the magnetic pole surface 21 of the movable core 2 can be fitted, and the direction of the resultant force of the attractive force generated between the protrusion 5 and the recess 6 when the coil 1 is energized is always along the direction in which the movable core 2 is attracted to the yoke plate 3, and has a greater attractive force. This configuration of the present invention utilizes the convex portion 5 of the magnetic pole surface 21 of the movable core 2 to reduce the magnetic gap between the two magnetic pole surfaces 21 and 31 at the position of the convex portion, thereby reducing magnetic resistance and increasing the initial electromagnetic attractive force, or reducing the coil volume and lowering the coil power consumption with an equivalent initial electromagnetic attractive force. The present invention ensures attraction at a predetermined position between the two magnetic pole surfaces 21 and 31 by utilizing the recess 6 of the magnetic pole surface 31 of the yoke plate 3 in cooperation with the convex portion 5 of the magnetic pole surface 21 of the movable core 2. The convex portion 5 of the magnetic pole surface 21 of the movable core 2 and the recess 6 of the magnetic pole surface 31 of the yoke plate 3 in the present invention are located on the outer edge of the return spring 41, allowing for rational use of the limited magnetic pole space and not occupying the space of the return spring (not affecting the reset function). In particular, this embodiment employs an annular convex portion 5, and the cooperation between the convex portion and the recess in an annular 360-degree longitudinal section around the intermediate return spring 41 can maximize the initial attractive force.

[0044] Example 2 of the magnetic circuit portion in which the initial electromagnetic attraction force is enhanced As shown in Figure 8, the difference between Embodiment 2 and Embodiment 1 of the magnetic path portion that enhances the initial electromagnetic attraction force of the present invention is that the protrusion 5 is a single component and is fixed to the magnetic pole surface 21 of the movable iron core 2.

[0045] Three embodiments of the magnetic circuit portion in which the initial electromagnetic attraction force is enhanced. As shown in Figure 9, the difference between Embodiment 3 and Embodiment 1 of the magnetic path portion with enhanced initial electromagnetic attraction of the present invention is that the convex portion 5 has a convex axial shape. Of course, the convex-shaped protrusion 5 may be a separate component, and the convex-shaped protrusion 5 is fixed to the magnetic pole surface 21 of the movable iron core 2.

[0046] Example 4 of the magnetic circuit portion in which the initial electromagnetic attraction force is enhanced As shown in Figure 10, the difference between Embodiment 4 and Embodiment 3 of the magnetic path portion that enhances the initial electromagnetic attraction force of the present invention is that there are two convex-axis shaped protrusions 5.

[0047] Example 5 of the magnetic circuit portion that enhances the initial electromagnetic attraction force As shown in Figures 11 and 12, the difference between Embodiment 5 and Embodiment 1 of the magnetic path portion that enhances the initial electromagnetic attraction force of the present invention is that there are two annular protrusions 5 and two corresponding recesses 6 on the magnetic pole surface 31 of the yoke plate 3.

[0048] Of course, the two annular protrusions 5 may be individual parts, and the two protrusions 5 are fixed to the magnetic pole surfaces 21 of the movable iron core 2.

[0049] Embodiment 6 of the magnetic circuit portion in which the initial electromagnetic attraction force is enhanced As shown in Figure 13, the difference between Embodiment 6 and Embodiment 1 of the magnetic path portion that enhances the initial electromagnetic attractive force of the present invention is that the stripe-shaped protrusions 5 are arc-shaped, there are two arc-shaped protrusions 5, and the recesses 6 of the magnetic pole surface 31 of the yoke plate 3 are two corresponding shapes. Of course, the two arc-shaped protrusions 5 may be individual parts, and the two protrusions 5 are fixed to the magnetic pole surfaces 21 of the movable iron core 2.

[0050] Example 7 of the magnetic circuit portion in which the initial electromagnetic attraction force is enhanced As shown in Figure 14, the difference between Embodiment 7 and Embodiment 1 of the magnetic path portion that enhances the initial electromagnetic attractive force of the present invention is that the side surfaces 52 on both sides of the protrusion 5 of the movable core 2 are sloped. In this embodiment, the side surfaces 52 on both sides of the protrusion 5 of the movable core 2 are sloped, and the side walls of the corresponding recess 6 of the yoke plate 3 are also sloped. In this structure, the protrusion height of the protrusion 5 of the magnetic pole surface 21 of the movable core 2 may be designed to be smaller than a predetermined magnetic gap between the two magnetic pole surfaces 21 and 31, or the protrusion height of the protrusion 5 of the magnetic pole surface 21 of the movable core 2 may be designed to be larger than a pre-provided magnetic gap between the two magnetic pole surfaces 21 and 31. In the latter case, when the coil is not energized, a portion of the protrusion 5 of the magnetic pole surface 21 of the movable core 2 is fitted into the recess 6 of the yoke plate 3. Eight examples of magnetic circuit sections where the initial electromagnetic attraction force is enhanced. As shown in Figure 15, the difference between Embodiment 8 and Embodiment 6 of the magnetic path portion in which the initial electromagnetic attractive force of the present invention is that the stripe-shaped protrusions 5 are straight.

[0051] Embodiment 9 of the magnetic circuit portion in which the initial electromagnetic attraction force is enhanced As shown in Figures 16 and 17, the difference between Embodiment 9 and Embodiment 1 of the magnetic path portion that enhances the initial electromagnetic attraction force of the present invention is that the convex portion 5 is provided on the magnetic pole surface 31 of the yoke plate 3, and the concave portion 6 is provided on the magnetic pole surface 21 of the movable iron core 2.

[0052] Examples of magnetic circuit sections that enhance the initial electromagnetic attraction force (10) As shown in Figures 18 and 19, the difference between Embodiment 10 and Embodiment 1 of the magnetic path portion that enhances the initial electromagnetic attraction force of the present invention is that there are two stationary magnetoconductors, a stationary core 7 in addition to the yoke plate 3, the stationary core 7 is attached to the yoke plate 3, and the lower end surface of the stationary core 7 matches the magnetic pole surface 21 of the movable core 2. That is, the lower end surface of the stationary core 7 is configured such that the magnetic pole surface 71 matches the magnetic pole surface 21 of the movable core 2. Therefore, in this embodiment, the recess 6 is provided on the magnetic pole surface 71 of the stationary core 7.

[0053] Example 11 of a magnetic circuit portion that enhances the initial electromagnetic attraction force As shown in Figures 20 and 21, the difference between Embodiment 11 and Embodiment 10 of the magnetic path portion that enhances the initial electromagnetic attraction force of the present invention is that the convex portion 5 is provided on the magnetic pole surface 71 of the stationary core 7, and the concave portion 6 is provided on the magnetic pole surface 21 of the movable core 2. Furthermore, the present invention also provides a linear magnetic circuit section and a high-voltage DC relay, and through structural improvements, it is possible to increase the initial electromagnetic attractive force with equivalent coil volume and power consumption, or to reduce the coil volume and reduce coil power consumption with equivalent initial electromagnetic attractive force.

[0054] The technical solution according to the present invention is a linear magnetic path portion including a coil, a movable conduit, and a stationary conduit, wherein the coil, movable conduit, and stationary conduit are each provided in suitable positions, the magnetic pole surface of the movable conduit and the magnetic pole surface of the stationary conduit are located opposite each other with a predetermined magnetic gap, the movable conduit is attracted to the stationary conduit when the coil is energized, one of the two magnetic pole surfaces is provided with a convex portion that protrudes toward the other magnetic pole surface, and the other magnetic pole surface is provided with a recess in a position corresponding to the convex portion into which the convex portion can be fitted, the recess depth of which is greater than or equal to the protruding height of the convex portion.

[0055] In one embodiment of the present invention, when the coil is not energized, the protruding height of the convex portion is smaller than a predetermined magnetic gap between the two magnetic pole surfaces.

[0056] In one embodiment of the present invention, when the protrusion is fully fitted into the recess, the gap between all sides of the protrusion and the corresponding side wall of the recess is exactly the same.

[0057] In one embodiment of the present invention, when the convex portion is fully fitted into the recess, the gap between the side surface of the convex portion and the side wall of the recess is greater than or equal to the distance from the top surface of the convex portion to the bottom surface of the recess, and the distance from the top surface of the convex portion to the bottom surface of the recess is greater than or equal to the distance between the two magnetic pole surfaces. In one embodiment of the present invention, the upper surface of the convex portion is flat, and the distance from the side edge of the upper surface of the convex portion to the side edge of the corresponding recess of the concave portion is smaller than a predetermined magnetic gap between the two magnetic pole surfaces.

[0058] In one embodiment of the present invention, the side surface of the convex portion is one or more combinations of a vertical surface, an inclined surface, and a curved surface.

[0059] In one embodiment of the present invention, the protrusions are one or more, and the recesses are one or more at corresponding positions.

[0060] In one embodiment of the present invention, the protrusion is a separate component and is fixed to the magnetic pole surface.

[0061] In one embodiment of the present invention, the protrusion is an integral structure formed on the magnetic pole surface.

[0062] In one embodiment of the present invention, the convex portion has a convex axial shape.

[0063] In one embodiment of the present invention, the protrusions are striped.

[0064] In one embodiment of the present invention, the convex portion is linear, arc-shaped, or annular.

[0065] In one embodiment of the present invention, the sum of the upper surface areas of all the protrusions on the magnetic pole surface is smaller than the remaining area after removing all the protrusions on the magnetic pole surface.

[0066] In one embodiment of the present invention, one of the pole surfaces is provided on a movable conduit, the other pole surface is provided on a stationary conduit, and the movable conduit is a movable iron core.

[0067] The stationary magnetic conduit is a fixed iron core or a yoke plate.

[0068] Another aspect of the present invention provides a high-voltage DC relay including the above-described linear magnetic circuit portion.

[0069] Compared to the prior art, the beneficial effects of the present invention are as follows:

[0070] The present invention provides a convex portion on one of two pole surfaces that protrudes toward the other pole surface, and the other pole surface has a recess at a position corresponding to the convex portion into which the convex portion can be fitted, and the recess depth of the recess is greater than or equal to the protruding height of the convex portion, and when the coil is not energized, the protruding height of the convex portion is smaller than a predetermined magnetic gap between the two pole surfaces. This configuration of the present invention reduces the magnetic gap between the two pole surfaces at the position of the convex portion by utilizing the convex portion of one of the two pole surfaces, thereby reducing the magnetic resistance and increasing the initial electromagnetic attractive force, or reducing the coil volume and reducing the coil power consumption with an equivalent initial electromagnetic attractive force. The present invention can guarantee attraction at a predetermined position between the two pole surfaces by using the recess of the other pole surface in cooperation with the convex portion of one pole surface.

[0071] As shown in Figures 1 to 22, which are used in the embodiment of the magnetic circuit portion that enhances the initial electromagnetic attraction force as described above, the present invention is also applicable to the linear magnetic circuit portion. For simplicity, the linear magnetic circuit portion and high-voltage DC relay of the present invention will be described in more detail below using Figures 1 to 22, however, the linear magnetic circuit portion and high-voltage DC relay of the present invention are not limited to the embodiment.

[0072] Embodiment 1 of the Linear Magnetic Circuit Section As shown in Figures 1 to 6, the linear magnetic path portion of the present invention includes a coil 1, a movable conduit 2, and a stationary conduit 3. The coil 1, the movable conduit 2, and the stationary conduit 3 are each provided in a suitable position so that the pole surface 21 of the movable conduit 2 and the pole surface 31 of the stationary conduit 3 are positioned opposite each other with a predetermined magnetic gap. When the coil 1 is energized, the movable conduit 2 is attracted to the stationary conduit 3. In this embodiment, the movable conduit The magnetic body 2 is a movable iron core, the stationary magnetic conductor 3 is a yoke plate, the magnetic path portion further includes a spring 41, a magnetic conductor cylinder 42, and a U-shaped yoke 43, the coil 1 is provided in the U-shaped opening of the U-shaped yoke 43, the magnetic conductor cylinder 42 is provided in the intermediate through hole of the coil 1, the bottom end of the magnetic conductor cylinder 42 is connected to the U-shaped yoke 43, the movable iron core 2 is movably provided in the intermediate through hole of the coil 1 and the intermediate through hole of the magnetic conductor cylinder 42, and the upper end surface of the movable iron core 2 is magnetic The pole surface 21 is mounted on the upper end of the U-shaped yoke 43 and is above the coil 1 and the movable core 2. The spring 41 is mounted between the movable core 2 and the yoke plate 3 to reset the movable core 2. The lower end surface of the yoke plate 3 is the magnetic pole surface 31. When the coil 1 is energized, the movable core 2 moves upward and is attracted to the yoke plate 3. In this embodiment, the magnetic pole surface 21 of the movable core 2, which is one of the two magnetic pole surfaces, is in the direction of the other magnetic pole surface. A protrusion 5 is provided on the yoke plate 3 that projects in the direction of the magnetic pole surface 31, and a recess 6 is provided on the magnetic pole surface 31 of the yoke plate 3 at a position corresponding to the protrusion 5 into which the protrusion 5 can be fitted. The depth of the recess 6 on the magnetic pole surface 31 of the yoke plate 3 is greater than or equal to the protrusion height of the protrusion 5 on the magnetic pole surface 21 of the movable core 2, and when the coil 1 is not energized, the protrusion height of the protrusion 5 on the magnetic pole surface 21 of the movable core 2 is smaller than a predetermined magnetic gap between the two magnetic pole surfaces 21 and 31.

[0073] In this embodiment, with the protrusion 5 fitted into the recess 6, the gap between all sides 52 of the protrusion 5 and the corresponding side wall 61 of the recess 6 is exactly the same.

[0074] In this embodiment, with the protrusion 5 fitted into the recess 6, the gap between the side surface 52 of the protrusion 5 and the side wall 61 of the recess 6 is greater than or equal to the distance from the upper surface 51 of the protrusion 5 to the bottom surface 62 of the recess 6, and the distance from the upper surface 51 of the protrusion 5 to the bottom surface 62 of the recess 6 is greater than or equal to the distance between the two magnetic pole surfaces 21 and 31.

[0075] In this embodiment, the upper surface 51 of the protrusion 5 is flat, and the distance from the side edge of the upper surface 51 of the protrusion 5 to the side edge of the corresponding recess opening of the recess 6 is smaller than a predetermined magnetic gap between the two magnetic pole surfaces 21 and 31.

[0076] In this embodiment, there is one convex portion 5 on the magnetic pole surface 21 of the movable iron core 2, and there is one concave portion 6 on the magnetic pole surface 31 of the yoke plate 3 at the corresponding position. In this embodiment, the protrusion 5 on the magnetic pole surface 21 of the movable iron core 2 is an integral structure formed on the magnetic pole surface 21 of the movable iron core 2.

[0077] In this embodiment, the protrusions 5 on the magnetic pole surface 21 of the movable iron core 2 are distributed in a stripe pattern.

[0078] In this embodiment, the convex portion 5 of the magnetic pole surface 21 of the movable iron core 2 is annular in shape.

[0079] In this embodiment, the sides of both sides of the convex portion 5 of the magnetic pole surface 21 of the movable iron core 2 are both vertical surfaces.

[0080] As shown in Figures 3 and 5, in this embodiment, the upper surface 51 of the protrusion 5 is flat, and when the protrusion 5 is fitted into the recess 6, the gaps between the side surface 52 of the protrusion 5 and the side wall 61 of the recess 6 are exactly the same at all points. As a result, when the coil 1 is energized, the direction of the resultant force of the attractive force generated between the protrusion 5 and the recess 6 is always along the direction in which the movable iron core 2 is attracted to the yoke plate 3.

[0081] In this embodiment, the area of ​​the upper surface of the protrusion 5 on the magnetic pole surface 21 of the movable core 2 is smaller than the remaining area of ​​the magnetic pole surface 21 of the movable core 2 after removing the protrusion 5.

[0082] As shown in Figure 3, immediately after energizing coil 1, an attractive force is generated between the movable core 2 and the yoke plate 3. This attractive force includes attractive forces F1 and F2 between both sides of the protrusion 5 of the movable core 2 and the corresponding edges of the recess 6 of the yoke plate 3, attractive force F5 between the upper surface 51 of the protrusion of the movable core 2 and the bottom surface 62 of the recess 6 of the yoke plate 3, and attractive forces F3 and F4 between the magnetic pole surfaces 21 and 31 on both sides of the protrusion 5.

[0083] At startup, the gaps in attractive forces F1 and F2 are smaller than the gaps in attractive forces F3, F4, and F5. Attractive forces F1 and F2 are large, and the gap in attractive force F1 is equal to the gap in attractive force F2. The resultant force of attractive forces F1 and F2 is aligned in the direction in which the movable core 2 is attracted to the yoke plate 3, and because attractive forces F1 and F2 are present, the initial electromagnetic attractive force is amplified. From startup until the magnetic pole surface 21 of the movable core 2 and the magnetic pole surface 31 of the yoke plate 3 are attracted together, attractive forces F1 and F2 are attracted simultaneously, the gaps in attractive forces F1 and F2 are equal, the attractive forces are symmetrical, and the resultant force is still aligned in the direction in which the movable core 2 is attracted to the yoke plate 3. Furthermore, as the gaps in attractive forces F3, F4, and F5 decrease, attractive forces F3, F4, and F5 gradually increase and gradually play a major role. The magnetic pole surfaces 21 of the movable core 2 and the magnetic pole surfaces 31 of the yoke plate 3 are attracted to each other and held in place. As shown in Figure 5, the attractive forces F3, F4, and F5 reach their maximum, while the attractive forces F1 and F2 are small. The resultant force of the attractive forces F1 and F2 still follows the direction in which the movable core 2 is attracted to the yoke plate 3.

[0084] The high-voltage DC relay of the present invention includes the above-described direct-acting magnetic circuit portion.

[0085] The linear-acting magnetic circuit section and high-voltage DC relay of the present invention are provided with a protrusion 5 on the magnetic pole surface 21 of the movable core 2 that projects toward the magnetic pole surface 31 of the yoke plate 3, and the magnetic pole surface 31 of the yoke plate 3 is provided with a recess 6 at a position corresponding to the protrusion 5, into which the movable core 2 and the yoke plate 3 are attracted to each other and the protrusion 5 of the magnetic pole surface 21 of the movable core 2 can be fitted. This configuration of the present invention utilizes the protrusion 5 of the magnetic pole surface 21 of the movable core 2 to reduce the magnetic gap between the two magnetic pole surfaces 21 and 31 at the position of the protrusion, thereby reducing magnetic resistance and increasing the initial electromagnetic attractive force, or reducing the coil volume and reducing coil power consumption with an equivalent initial electromagnetic attractive force. The present invention can guarantee attraction at a predetermined position between the two magnetic pole surfaces 21 and 31 by utilizing the recess 6 of the magnetic pole surface 31 of the yoke plate 3 in cooperation with the protrusion 5 of the magnetic pole surface 21 of the movable core 2.

[0086] Example 2 of the direct-acting magnetic circuit section As shown in Figure 8, the difference between Embodiment 2 and Embodiment 1 of the linear magnetic circuit portion and high-voltage DC relay of the present invention is that the protrusion 5 is a separate component and is fixed to the magnetic pole surface 21 of the movable iron core 2.

[0087] Embodiment 3 of the direct-acting magnetic circuit section As shown in Figure 9, the difference between the linear magnetic circuit portion and high-voltage DC relay embodiment 3 and embodiment 1 of the present invention is that the protrusion 5 has a convex axial shape.

[0088] Of course, the convex-shaped protrusion 5 may be a separate component, and the convex-shaped protrusion 5 is fixed to the magnetic pole surface 21 of the movable iron core 2.

[0089] Embodiment 4 of the direct-acting magnetic circuit section As shown in Figure 10, the difference between Embodiment 4 and Embodiment 3 of the linear magnetic circuit portion and high-voltage DC relay of the present invention is that there are two convex-shape convex portions 5.

[0090] Example 5 of the Linear Magnetic Circuit Section As shown in Figures 11 and 12, the difference between Embodiment 5 and Embodiment 1 of the linear magnetic circuit portion and high-voltage DC relay of the present invention is that there are two annular protrusions 5 and two corresponding recesses 6 on the magnetic pole surface 31 of the yoke plate 3.

[0091] Of course, the two annular protrusions 5 may be individual parts, and the two protrusions 5 are fixed to the magnetic pole surfaces 21 of the movable iron core 2.

[0092] Embodiment 6 of the Linear Magnetic Circuit Section As shown in Figure 13, the difference between Embodiment 6 and Embodiment 1 of the linear magnetic circuit portion and high-voltage DC relay of the present invention is that the stripe-shaped protrusions 5 are arc-shaped, there are two arc-shaped protrusions 5, and the recesses 6 of the magnetic pole surface 31 of the yoke plate 3 are two corresponding shapes.

[0093] Of course, the two arc-shaped protrusions 5 may be individual parts, and the two protrusions 5 are fixed to the magnetic pole surfaces 21 of the movable iron core 2.

[0094] Example 7 of the Linear Magnetic Circuit Section As shown in Figure 11, the difference between the linear magnetic circuit portion and high-voltage DC relay of the present invention and Embodiment 1 is that the side surfaces 52 on both sides of the protrusion 5 of the movable core 2 are sloped.

[0095] Eight examples of the linear magnetic circuit section As shown in Figure 15, the difference between the linear magnetic circuit portion and high-voltage DC relay of the present invention and Embodiment 6 is that the stripe-shaped protrusions 5 are linear.

[0096] Embodiment 9 of the Linear Magnetic Circuit Section As shown in Figure 22, the difference between the linear magnetic circuit portion and high-voltage DC relay of the present invention and Embodiment 1 is that one side surface 52 of the protrusion 5 of the movable core 2 is sloped.

[0097] Examples of the Linear Magnetic Circuit Section (10) As shown in Figure 23, the difference between the linear magnetic circuit portion and high-voltage DC relay of the present invention and Embodiment 1 is that the height positions of the bases of both sides of the protrusion 5 of the movable core 2 do not coincide.

[0098] Example 11 of the direct-acting magnetic circuit section As shown in Figures 16 and 17, the difference between the linear magnetic circuit portion and high-voltage DC relay of the present invention and Embodiment 1 is that the convex portion 5 is provided on the magnetic pole surface 31 of the yoke plate 3, and the concave portion 6 is provided on the magnetic pole surface 21 of the movable iron core 2.

[0099] Example 12 of the direct-acting magnetic circuit section As shown in Figures 18 and 19, the linear magnetic circuit portion and high-voltage DC relay of the present invention differ from Embodiment 1 in that there are two stationary conductors, and in addition to the yoke plate 3, there is a stationary core 7, the stationary core 7 is attached to the yoke plate 3, and the lower end surface of the stationary core 7 matches the magnetic pole surface 21 of the movable core 2, that is, the lower end surface of the stationary core 7 is configured so that the magnetic pole surface 71 of the stationary core 7 matches the magnetic pole surface 21 of the movable core 2, so in this embodiment, the recess 6 is provided on the magnetic pole surface 71 of the stationary core 7.

[0100] Example 13 of the direct-acting magnetic circuit section As shown in Figures 20 and 21, the linear magnetic circuit portion and high-voltage DC relay of the present invention differ from those of Embodiment 12 in that the convex portion 5 is provided on the magnetic pole surface 71 of the stationary core 7, and the concave portion 6 is provided on the magnetic pole surface 21 of the movable core 2.

[0101] The present invention also provides a magnetic circuit section and a high-voltage DC relay that can improve the initial electromagnetic attractive force, and through structural improvements, it is possible to increase the initial electromagnetic attractive force with the same coil volume and power consumption, or to reduce the coil volume and reduce coil power consumption with the same initial electromagnetic attractive force.

[0102] The technical solution of the present invention is a magnetic path portion that can improve the initial electromagnetic attractive force, comprising a coil, a movable conduit and a stationary conduit, wherein the coil, the movable conduit and the stationary conduit are mounted in suitable positions so that the magnetic pole surfaces of the movable conduit and the magnetic pole surfaces of the stationary conduit are positioned opposite each other with a predetermined magnetic gap, the movable conduit is attracted to the stationary conduit when the coil is energized, and the magnetic path portion further comprises a convex member, the convex member opposite the magnetic pole surface of one of the two members of the movable conduit and the stationary conduit. The movable magneto guide is slidably positioned in a corresponding location, and when the movable magneto guide is not moving, the protruding member protrudes in a direction from the magnetic pole surface of one member toward the magnetic pole surface of the other member. This reduces the magnetic gap between the magnetic pole surfaces of the two members at the position of the protruding member, thereby lowering the magnetic resistance and improving the initial electromagnetic attraction force. After the movable magneto guide moves and the protruding member of one member comes into contact with the magnetic pole surface of the other member, the protruding member moves in the opposite direction of protrusion, thereby ensuring attraction at a predetermined position between the magnetic pole surfaces of the two members.

[0103] According to one embodiment of the present invention, the convex member is a block structure with a protruding portion, and a slide groove is provided at a location corresponding to the magnetic pole surface of one of the two members, the movable magnet and the stationary magnet. The convex member of the block structure is slidably arranged in the slide groove of one of the two members, the movable magnet and the stationary magnet, and the protruding portion of the convex member protrudes from the magnetic pole surface of one member toward the magnetic pole surface of the other member.

[0104] According to one embodiment of the present invention, a first stepped structure is provided between the block structure with the protrusion and the slide groove, and the first stepped structure restricts the movement of the protrusion of the convex member in the direction of the magnetic pole surface of the other member, thereby ensuring that there is a certain gap between the protrusion of the convex member of one member and the magnetic pole surface of the other member when the movable magnetic conductor is not moving.

[0105] According to one embodiment of the present invention, the block structure with protrusions is one or more, and the sliding grooves of one of the two members, the movable magnetic conductor and the stationary magnetic conductor, are one or more corresponding.

[0106] According to one embodiment of the present invention, the protruding member is an annular member, and the annular member is slidably arranged around the outer periphery of one of the two members, the movable magnetic conduit and the stationary magnetic conduit, with one end of the annular member protruding from the magnetic pole surface of one member toward the magnetic pole surface of the other member. According to one embodiment of the present invention, a convex edge structure is provided between the other end of the annular member and the outer periphery of one of the two members, the movable magnetic conductor and the stationary magnetic conductor, which fits together. The convex edge structure restricts the movement of one end of the annular member in the direction of the magnetic pole surface of the other member, and ensures that there is a certain gap between one end of the annular member and the magnetic pole surface of the other member when the movable magnetic conductor is not moving.

[0107] In one embodiment of the present invention, the convex member is slidably arranged on the movable magnetic conduit, and the movable magnetic conduit is a movable iron core.

[0108] In one embodiment of the present invention, the convex member is slidably arranged on the stationary magnetic conductor, and the stationary magnetic conductor is a yoke plate or a stationary iron core.

[0109] Another aspect of the present invention provides a high-voltage DC relay that includes a magnetic path portion capable of improving the initial electromagnetic attraction force.

[0110] Compared to conventional technology, the beneficial effects of the magnetic circuit portion and high-voltage DC relay of the present invention, which can improve the initial electromagnetic attraction force, are as follows:

[0111] The magnetic path portion of the present invention is provided with a protruding member, which is slidably positioned to correspond to the magnetic pole surface of one of the two members, the movable conduit and the stationary conduit. When the movable conduit is not moving, the protruding member protrudes from the magnetic pole surface of one member toward the magnetic pole surface of the other member. After the movable conduit moves and the protruding member of one member comes into contact with the magnetic pole surface of the other member, the protruding member moves in the opposite direction to the protrusion. As a first aspect of this configuration of the present invention, by having the protruding member protrude from the magnetic pole of one member toward the magnetic pole surface of the other member so that the magnetic gap between the magnetic pole surfaces of the two members becomes smaller at the position of the protruding member, magnetic resistance can be reduced and the initial electromagnetic attractive force can be improved, or the coil volume can be reduced and coil power consumption can be reduced with an equivalent initial electromagnetic attractive force. Furthermore, the present invention allows the protruding member to move in the opposite direction to the protrusion, thereby ensuring attraction at a predetermined position between the magnetic pole surfaces of the two members. As a second aspect, there is no need to provide a yoke space during the attraction process between the movable and stationary conductors, and the convex member is provided in the direction of the gap between the movable and stationary conductors, generating an attractive force of the movable conductor toward the stationary conductor. As a third aspect, when it is necessary to design the protrusion height of the convex member according to the matching of the attractive reaction force, since the convex member is movable, there is no need to replace the entire movable conductor (movable core) or stationary conductor (stationary core or yoke plate) at the design stage, thereby reducing design costs and processes.

[0112] The magnetic circuit portion and high-voltage DC relay of the present invention, which can improve the initial electromagnetic attraction force, will be described in more detail below with reference to the drawings and embodiments.

[0113] Embodiment 1 of a magnetic circuit portion that can improve the initial electromagnetic attraction force As shown in Figures 24 to 27, the magnetic path portion of the present invention that can improve the initial electromagnetic attractive force includes a coil 1, a movable conduit 2, and a stationary conduit 3. The coil 1, the movable conduit 2, and the stationary conduit 3 are each mounted in suitable positions so that the pole surface 21 of the movable conduit 2 and the pole surface 31 of the stationary conduit 3 are positioned opposite each other with a predetermined magnetic gap. When the coil 1 is energized, the movable conduit 2 is attracted to the stationary conduit 3. In this embodiment, the movable conduit 2 is a movable iron core, and the stationary conduit 3 is a yoke plate. The magnetic path portion further includes a spring. The coil 1 is provided in the U-shaped opening of the U-shaped yoke 43, the magnetic conduit 42 is provided in the intermediate through hole of the coil 1, the bottom end of the magnetic conduit 42 is connected to the U-shaped yoke 43, the movable core 2 is movably provided in the intermediate through hole of the coil 1 and the intermediate through hole of the magnetic conduit 42, the upper end surface of the movable core 2 is the magnetic pole surface 21, the yoke plate 3 is mounted on the upper end of the U-shaped yoke 43 and is above the coil 1 and the movable core 2, the spring 41 is mounted between the movable core 2 and the yoke plate 3 to reset the movable core 2 and below the yoke plate 3 The end face is a magnetic pole surface 31, and when the coil 1 is energized, the movable core 2 moves upward and is attracted to the yoke plate 3. The magnetic path portion further includes a convex member 50 which is slidably positioned at a position corresponding to the magnetic pole surface of one of the two members of the movable conductor and the stationary conductor. In this embodiment, one of the two members of the movable conductor and the stationary conductor is the stationary conductor, i.e., the yoke plate 3, and the other is the movable core 2. The convex member 50 is slidably positioned at a position corresponding to the magnetic pole surface 31 of the yoke plate 3, and when the movable core 2 does not move upward, The protruding member 50 protrudes from the magnetic pole surface 31 of the yoke plate 3 toward the magnetic pole surface 21 of the movable core 2. This reduces the magnetic gap between the magnetic pole surface 21 of the movable core 2 and the magnetic pole surface 31 of the yoke plate 3 at the position of the protruding member 50, thereby reducing magnetic resistance and improving the initial electromagnetic attraction force. After the movable core 2 moves and the protruding member 50 of the yoke plate 3 comes into contact with the magnetic pole surface 21 of the movable core 2, the protruding member 50 moves in the opposite direction of protrusion, ensuring attraction at a predetermined position between the magnetic pole surface 21 of the movable core 2 and the magnetic pole surface 31 of the yoke plate 3. In this embodiment, the convex member 50 is a block structure with a projection 510, and a slide groove 36 is provided at a position corresponding to the magnetic pole surface 31 of the yoke plate 3. The convex member 50 of the block structure is slidably arranged in the slide groove 36 of the yoke plate 3, and the projection 510 of the convex member 50 protrudes from the magnetic pole surface 31 of the yoke plate 3 in the direction of the magnetic pole surface 21 of the movable iron core 2, and the upper surface 511 of the projection 510 of the convex member 50 is flat.

[0114] In this embodiment, a first staircase structure is provided between the block structure 5 with the protrusion 510 and the slide groove 36 of the yoke plate 3, including a staircase 520 provided on the convex member 50 and a staircase 33 provided on the slide groove 36 of the yoke plate 3. The staircase 520 of the convex member 50 and the staircase 33 of the yoke plate 3 cooperate to restrict the movement of the protrusion 510 of the convex member 50 in the direction of the magnetic pole surface 21 of the movable core 2, and a certain gap is secured between the protrusion 510 of the convex member 50 and the magnetic pole surface 21 of the movable core 2 when the movable core 2 is not moving. That is, the size of the protrusion of the convex member 50 that protrudes outside the magnetic pole surface 31 of the yoke plate 3 is smaller than a predetermined magnetic gap between the magnetic pole surface 21 of the movable core 2 and the magnetic pole surface 31 of the yoke plate 3. In this embodiment, there are two block structures 5 with protrusions 510, and there are also two corresponding slide grooves 36 in the yoke plate 3.

[0115] The high-voltage DC relay of the present invention includes a magnetic circuit portion that can improve the initial electromagnetic attraction force.

[0116] Referring to Figure 27, the magnetic path section and high-voltage DC relay that can improve the initial electromagnetic attractive force of the present invention are shown. Curve 1 in the figure is the reaction force curve of the relay motion, curve 2 is the attractive force curve of a conventional relay, and curve 3 is the attractive force curve of the present invention. At the moment of relay startup, the magnetic gap is at its maximum, as shown on the right side of Figure 4 (i.e., 1.45 mm). At this time, assuming a drive voltage of 7 V is applied to the coil, the conventional technology generates an electromagnetic attractive force (right side of curve 2 in Figure 4). In the present invention, by providing the convex member 50, the magnetic gap is brought closer, the initial magnetic resistance is reduced, the initial attractive force is improved, and the startup power consumption is reduced. At this time, the drive voltage is still 7 V, but the generated electromagnetic attractive force is greater (right side of curve 3 in Figure 4). As can be seen from Figure 4, curves 2 and 3 intersect at a magnetic gap of 0.35 mm, and from a magnetic gap of 1.45 mm to 0.35 mm, the electromagnetic attractive force of the present invention is greater than that of the conventional technology. When generating the same electromagnetic attractive force as in the conventional technology, only a smaller drive voltage is required, thereby reducing drive power consumption. When the protruding member 50 comes into contact with the magnetic pole surface 21 of the movable iron core 2, the effect of the protruding member 50 in increasing the attractive force disappears. At this time, the two magnetic pole surfaces 21 and 31 are in close proximity, so the electromagnetic attractive force is large, and by providing the protruding member 50, movement in the opposite direction is possible. Therefore, the protruding member 50 does not obstruct the movement of the magnetic poles until the iron core is completely closed, that is, until the magnetic pole surface 21 of the movable iron core 2 is attracted to the magnetic pole surface 31 of the yoke plate 3.

[0117] In the magnetic path portion and high-voltage DC relay of the present invention, which can improve the initial electromagnetic attraction force, a protruding member 50 is further provided in the magnetic path portion. The protruding member 50 is slidably positioned to correspond to the magnetic pole surface 31 of the yoke plate 3. When the movable core 2 is not moving, the protruding member 50 protrudes from the magnetic pole surface 31 of the yoke plate 3 toward the magnetic pole surface 21 of the movable core 2. After the movable core 2 moves and the protruding member 50 of the yoke plate 3 comes into contact with the magnetic pole surface 21 of the movable core 2, the protruding member 50 moves in the opposite direction to the protrusion. As a first aspect of this configuration of the present invention, the convex member 50 protrudes from the magnetic pole surface 31 of the yoke plate 3 toward the magnetic pole surface 21 of the movable core 2, thereby reducing the magnetic gap between the two magnetic pole surfaces 21 and 31 at the position of the convex member 50, thereby reducing magnetic resistance and improving the initial electromagnetic attractive force, or reducing the coil volume and reducing coil power consumption with an equivalent initial electromagnetic attractive force. The present invention allows the convex member 50 to move in the opposite direction of protrusion, thereby ensuring attraction at a predetermined position between the two magnetic pole surfaces 21 and 31. The present invention also has the feature of a simple structure. As a second aspect, in the attraction process between the movable core 2 and the yoke plate 3, it is not necessary to provide a yoke space, and it can be provided in the direction of the gap between the movable core 2 and the yoke plate 3 to generate an attractive force of the movable core 2 toward the yoke plate 3. As a third aspect, when it is necessary to design the protruding height of the convex member according to the matching of the attractive reaction force, since the convex member is movable, it is not necessary to replace the entire movable magnetic conductor (movable iron core) or the stationary magnetic conductor (yoke plate) during the design phase, thereby reducing design costs and processes.

[0118] Two embodiments of a magnetic circuit section capable of improving the initial electromagnetic attraction force. As shown in Figures 28 to 29, the magnetic path portion and high-voltage DC relay of the present invention, which can improve the initial electromagnetic attraction force, differ from Embodiment 1 in that there are two stationary conductors, and in addition to the yoke plate 3 there is a stationary core 7, the stationary core 7 is mounted on the yoke plate 3, and the lower end surface of the stationary core 7 is aligned with the magnetic pole surface 21 of the movable core 2, that is, the lower end surface of the stationary core 7 is configured so that the magnetic pole surface 71 is aligned with the magnetic pole surface 21 of the movable core 2, and the convex member 50 is slidably positioned at a position corresponding to the magnetic pole surface 71 of the stationary core 7, the convex member 50 is not mounted on the yoke plate 3, the stationary core 7 is provided with a slide groove 72 and steps 73, the yoke plate 3 is not provided with a slide groove and steps, the convex member 50 is aligned with the slide groove 72 of the stationary core 7, and the steps 520 of the convex member 50 are aligned with the steps 73 of the stationary core 7.

[0119] Three embodiments of a magnetic circuit section that can improve the initial electromagnetic attraction force. As shown in Figures 30 to 31, the magnetic path portion and high-voltage DC relay of the present invention, which can improve the initial electromagnetic attraction force, differ from Embodiment 2 in that the convex member 50 is not mounted on the stationary core 7, but is slidably positioned at a location corresponding to the magnetic pole surface 21 of the movable core 2, the movable core 2 is provided with a slide groove 22 and steps 23, the stationary core 7 is not provided with a slide groove and steps, the convex member 50 is aligned with the slide groove 22 of the movable core 2, and the steps 520 of the convex member 50 are aligned with the steps 23 of the movable core 2.

[0120] In this embodiment, since the movable core 2 is located below and the stationary core 7 is located above, a support spring 24 is further attached to the bottom end of the protruding member 50 to prevent it from falling freely into the slide groove 22 of the movable core 2, and a plug 25 for supporting the support spring 24 is further provided on the lower surface of the support spring 24.

[0121] Embodiment 4 of a magnetic circuit portion that can improve the initial electromagnetic attraction force As shown in Figures 32 to 33, the magnetic path portion and high-voltage DC relay of the present invention, which can improve the initial electromagnetic attraction force, differ from Embodiment 1 in that the convex member 50 is slidably positioned at a location corresponding to the magnetic pole surface 21 of the movable core 2, rather than the yoke plate 3, the movable core 2 is provided with a slide groove 22 and steps 23, the yoke plate 3 is not provided with a slide groove and steps, the convex member 50 is aligned with the slide groove 22 of the movable core 2, and the steps 520 of the convex member 50 are aligned with the steps 23 of the movable core 2.

[0122] In this embodiment, since the movable core 2 is located below and the yoke plate 3 is located above, a support spring 24 is further attached to the bottom end of the protruding member 50 to prevent it from falling freely into the slide groove 22 of the movable core 2, and a plug 25 for supporting the support spring 24 is further provided on the lower surface of the support spring 24.

[0123] Five embodiments of a magnetic circuit section capable of improving the initial electromagnetic attraction force. As shown in Figures 34 to 35, the magnetic path portion and high-voltage DC relay of the present invention, which can improve the initial electromagnetic attraction force, differ from Embodiment 2 in that the convex member is not a block structure with a protruding part, the convex member 50 is an annular member, the annular member 8 is slidably arranged around the outside of the stationary core 7, and one end 81 of the annular member 8 protrudes from the magnetic pole surface 71 of the stationary core 7 toward the magnetic pole surface 21 of the movable core 2, and the stationary core 7 is not provided with sliding grooves or steps to match the block structure with a protruding part.

[0124] In this embodiment, a convex edge structure is provided between the other end of the annular member 8 and the outer circumference of the stationary core 7, and the convex edge structure includes an inner convex edge 82 provided at the other end of the annular member 8 and an outer convex edge 64 located near the magnetic pole surface 71 of the stationary core 7, and the cooperation of the inner convex edge 82 of the annular member 8 and the outer convex edge 64 of the stationary core 7 restricts the movement of one end 81 of the annular member 8 in the direction of the magnetic pole surface 21 of the movable core 2, thereby ensuring that there is a certain gap between one end 81 of the annular member 8 and the magnetic pole surface 21 of the movable core 2 when the movable core 2 is not moving.

[0125] Six embodiments of a magnetic circuit portion that can improve the initial electromagnetic attraction force. As shown in Figures 36 to 37, the initial electromagnetic attraction force of the present invention can be improved, and unlike the high-voltage DC relay and Embodiment 1, the convex member is not a block structure with a protruding part, the convex member 50 is an annular member, the annular member 8 is slidably arranged around the outside of the movable iron core 2, and one end 81 of the annular member 8 protrudes from the magnetic pole surface 21 of the movable iron core 2 toward the magnetic pole surface 31 of the yoke plate 3, and the yoke plate 3 does not have a sliding groove and steps to match the block structure with a protruding part.

[0126] In this embodiment, a convex edge structure is provided between the other end of the annular member 8 and the outer periphery of the movable core 6, and the convex edge structure includes an inner convex edge 82 provided on the other end of the annular member 8 and the periphery 27 of the bottom end of the movable core 2, and through the cooperation of the inner convex edge 82 of the annular member 8 and the periphery 27 of the bottom end of the movable core 2, the convex edge structure restricts the movement of one end 81 of the annular member 8 in the direction of the magnetic pole surface 31 of the yoke plate 3, and ensures that there is a certain gap between one end 81 of the annular member 8 and the magnetic pole surface 31 of the yoke plate 3 when the movable core 2 is not moving.

[0127] In this embodiment, since the movable core 2 is at the bottom and the yoke plate 3 is at the top, a support spring 24 is further attached to the bottom end of the annular member 8 to prevent the annular member 8 from freely falling along the outer periphery of the movable core 2, and a metal case 26 for supporting the support spring 24 is provided on the lower surface of the support spring 24.

[0128] It should be understood that the present invention is not limited to the detailed structure and arrangement of the components proposed herein. The present invention may have other embodiments and can be realized and carried out in various ways. The aforementioned variations and modifications are within the scope of the present invention. It should be understood that the present invention disclosed and limited herein extends to all alternative combinations of two or more distinct features described or evident in the text and / or drawings. All these different combinations constitute multiple alternative aspects of the present invention. The embodiments described herein illustrate the best way to realize the present invention which is known and is intended to make the present invention available to those skilled in the art.

Claims

1. A magnetic circuit portion that can improve the initial electromagnetic attractive force, The magnetic path includes a coil, a movable conductor, and a stationary conductor, the coil, the movable conductor, and the stationary conductor being mounted in suitable positions, such that the pole surfaces of the movable conductor and the stationary conductor are positioned opposite each other with a predetermined magnetic gap, the movable conductor is attracted to the stationary conductor when the coil is energized, and the magnetic path portion further includes a convex member, the convex member being slidably positioned to correspond to the pole surface of one of the two members, the movable conductor and the stationary conductor. When the movable magnetoconduct is not moving, the protruding member protrudes in a direction from the magnetic pole surface of one member toward the magnetic pole surface of the other member. This reduces the magnetic gap between the magnetic pole surfaces of the two members at the position of the protruding member, thereby lowering the magnetic resistance and improving the initial electromagnetic attraction force. After the movable magnetoconduct moves and the protruding member of one member comes into contact with the magnetic pole surface of the other member, the protruding member moves in the opposite direction of protrusion, thereby ensuring attraction at a predetermined position between the magnetic pole surfaces of the two members. A magnetic circuit portion characterized by the following features.

2. The aforementioned convex member is a block structure with a protruding portion, and a slide groove is provided at a location corresponding to the magnetic pole surface of one of the two members, the movable magnetoconduct and the stationary magnetoconduct. The convex member of the block structure is slidably positioned in the slide groove of one of the two members, the movable magnetoconduct and the stationary magnetoconduct, and the protruding portion of the convex member protrudes from the magnetic pole surface of one member toward the magnetic pole surface of the other member. The magnetic circuit portion according to feature 1.

3. A first stepped structure is provided between the block structure with the protrusion and the slide groove, which are designed to fit together. This first stepped structure restricts the movement of the protrusion of the convex member in the direction of the magnetic pole surface of the other member, thereby ensuring that a certain gap exists between the protrusion of the convex member of one member and the magnetic pole surface of the other member when the movable magnetic conductor is not moving. The magnetic circuit portion according to feature 2.

4. This block structure with protrusions is one or more in number, and the sliding grooves of one of the two members, the movable magnetic conductor and the stationary magnetic conductor, correspond to one or more of the other members. The magnetic path portion according to claim 2 or 3.

5. The aforementioned protruding member is an annular member, which is slidably positioned around the outer periphery of one of the two members, the movable magnetoconduct and the stationary magnetoconduct, with one end of the annular member projecting from the magnetic pole surface of one member toward the magnetic pole surface of the other member. The magnetic circuit portion according to feature 1.

6. A convex edge structure is provided between the other end of the annular member and the outer periphery of one of the two members, the movable and stationary magnetoconduct, to fit together. This convex edge structure restricts the movement of one end of the annular member in the direction of the magnetic pole surface of the other member, and ensures that there is a certain gap between the one end of the annular member and the magnetic pole surface of the other member when the movable magnetoconduct is not moving. The magnetic circuit portion according to feature 5.

7. The convex member is slidably arranged on the movable magnetic conduit, and the movable magnetic conduit is a movable iron core. The magnetic path portion according to any one of claims 1 to 3 or 5 to 6.

8. The convex member is slidably arranged on the stationary magnetoconduct, and the stationary magnetoconduct is a yoke plate. The magnetic path portion according to any one of claims 1 to 3 or 5 to 6.

9. The convex member is slidably disposed on the stationary magnetoconduct, and the stationary magnetoconduct is a stationary iron core. The magnetic path portion according to any one of claims 1 to 3 or 5 to 6.

10. Includes a magnetic path portion that can improve the initial electromagnetic attraction force as described in any one of claims 1 to 3 or 5 to 6. A high-voltage DC relay characterized by the following features.

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