Energy-saving snap type electromagnetic relay

Abstract

The application relates to the technical field of electromagnetic relays, and particularly discloses an energy-saving clapper type electromagnetic relay which comprises an iron core and an armature assembled on a coil frame; the armature extends to the outside of a pole shoe of the iron core, and a magnetic conduction structure is arranged between the armature and the iron core; the magnetic conduction structure is a magnetic conduction elastic sheet which can be elastically deformed by itself and has a fixed end and a movable end; the magnetic conduction elastic sheet is fixedly connected with the iron core and the armature through the fixed end, and the movable end of the magnetic conduction elastic sheet is arranged between the armature and the iron core in movable cooperation. The electromagnetic relay can effectively reduce a magnetic gap, improve magnetic circuit suction, accelerate contact disconnection in a contact release process and reduce arc time, and can maintain good structural stability, guarantee reliability in a service process and effectively reduce manufacturing cost with a simple structure.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic relay technology, specifically an energy-saving snap-action electromagnetic relay. Background Technology

[0002] A snap-action electromagnetic relay, a common type of electromagnetic relay structure, mainly consists of a coil frame and a magnetic circuit and contact portion mounted on the coil frame. The magnetic circuit portion primarily comprises a coil, iron core, yoke, and armature mounted on the coil frame. The armature is fitted onto the knife edge of the yoke via a compression spring (or an L-shaped moving spring in the moving spring section) in a snap-fit ​​manner, extending to the outside of the pole shoe of the iron core. The moving spring in the contact portion is fixed to the surface of the armature opposite to the iron core and extends, causing the moving contact to extend to one end of the coil frame. The stationary spring in the contact portion is mounted on the coil frame, positioning the stationary contact inside / outside the direction of the moving spring's rotation (usually inside; however, two sets of stationary springs can be used, forming an inner normally open stationary spring and an outer normally closed stationary spring). The operation of a snap-action electromagnetic relay is roughly as follows: When the excitation current flowing through the coil rises to a certain set value, the electromagnetic attraction torque will overcome the reaction torque of the moving spring, thereby causing the armature to swing and rotate in a snapping motion at the knife edge of the yoke. The moving contact then engages with the inner stationary contact at one end of the coil frame. When the excitation current flowing through the coil decreases to a certain set value, the reaction torque of the moving spring is greater than the electromagnetic attraction torque, and the armature swings and rotates at the knife edge of the yoke to reset. The moving contact then disconnects from the inner stationary contact at one end of the coil frame.

[0003] As can be seen from the above-mentioned structure of the snap-action electromagnetic relay, the magnetic gap between the armature and the pole shoe of the iron core basically directly determines the contact gap between the moving spring and the stationary spring, or in other words, the contact gap between the moving spring and the stationary spring basically directly determines the magnetic gap between the armature and the pole shoe of the iron core.

[0004] In the design of electromagnetic relays, to ensure product performance and application reliability, the contact gap between the moving spring and the stationary spring must be sufficiently large to prevent non-technical conduction between them—such as vibration-induced conduction under vibration conditions, elastic rebound conduction during the release of the moving spring, or air breakdown conduction due to excessively high voltage between the contacts. This is especially prominent in high-voltage DC environments. For the aforementioned snap-fit ​​electromagnetic relays, the large contact gap design, without changing the design positions of the armature and the spring, inevitably results in a large magnetic gap between the armature and the pole shoes of the iron core. The larger the magnetic gap between the armature and the pole shoes of the iron core, the greater the magnetic reluctance of the magnetic circuit, and the smaller the corresponding magnetic attraction force. To ensure that the above-mentioned operation process meets the technical requirements of actual operating conditions, the large magnetic gap design requires a sufficient number of enameled wire turns and a sufficiently large excitation current.

[0005] However, the magnitude of the magnetic attraction force generated by the coil is determined by the ampere-turns (the product of the number of coil turns and the coil excitation current). Simply increasing the number of coil turns in an electromagnetic relay will lead to a decrease in coil resistance and a decrease in coil excitation current. To achieve the desired effect, it is necessary to increase the cross-sectional area of ​​the enameled wire while increasing the number of coil turns to ensure an increase in coil excitation current. This not only increases manufacturing costs, increases the product's structural size, and increases energy consumption, but also makes contact release difficult, increases the arcing time for contact disconnection, and makes the contacts prone to sticking. This is particularly prominent for the snap-action electromagnetic relays mentioned above, which are characterized by their small size and low power consumption. Therefore, designing a snap-action electromagnetic relay that can reduce the magnetic gap to improve the magnetic attraction force without changing the design positions of the armature and spring has significant technical and economic implications.

[0006] During the product development process of this application, a search of existing technologies revealed a Chinese patent document entitled "Energy-Saving Clamping Relay," publication number CN 115938867 A, published on April 7, 2023. This technology discloses a magnetically conductive element, driven by an independent elastic element and hinged to the pole shoe of the core or the armature, placed between the armature and the core of the clamping electromagnetic relay. This magnetically conductive element, driven by the elastic element, reduces the magnetic gap between the armature and the pole shoe of the core, thereby increasing the magnetic attraction force. However, analysis revealed that this technology has the following significant technical problems, resulting in poor stability and reliability, and high manufacturing costs: Firstly, the magnetic conductor is mounted on the armature / core with a hinged structure. The hinged structure is prone to jamming during long-term service, especially in salt spray or humid working environments. Secondly, the magnetic conductors installed in the hinged structure will swing within a certain range when vibration occurs, and their ability to resist vibration and impact is relatively poor. Thirdly, the magnetic conductor installed in the hinged structure is limited and supported in the direction supported by the elastic element, but is relatively free in the other direction. As a result, the electrical performance will vary greatly under the weight of the magnetic conductor, which places high technical requirements on the installation position and operation in the end product application. Fourth, the magnetic conductive component and the elastic component are relatively independent structures, and the two are assembled together. This places high technical requirements on the assembly accuracy, and the assembly structure is prone to failure when subjected to impact during the subsequent molding process and product application. Fifth, the installation structure of the magnetic conductors and elastic components on the corresponding iron core / armature is delicate and complex, which places high technical requirements on the installation structure of the iron core / armature. This results in high difficulty in the processing technology of the iron core / armature and high difficulty in the assembly technology of the magnetic conductors and elastic components on the iron core / armature. Consequently, it has an adverse effect on manufacturing efficiency and cost, which is obviously not conducive to electromagnetic relays improving market competitiveness with extreme cost performance. Summary of the Invention

[0007] The technical objective of this invention is to provide an energy-saving snap-action electromagnetic relay that, in view of the special characteristics of the aforementioned snap-action electromagnetic relay and the shortcomings of existing technologies in reducing the magnetic gap, can effectively reduce the magnetic gap and improve the magnetic circuit attraction, maintain good structural stability with a simple structure, ensure reliability during service, and effectively reduce manufacturing costs.

[0008] The technical objective of this invention is achieved through the following technical solution: an energy-saving snap-action electromagnetic relay, comprising an iron core and an armature mounted on a coil frame; The armature extends to the outside of the pole shoe of the iron core, and a magnetic conductive structure is provided between the armature and the iron core; The magnetically conductive structure is a self-elastically deformable magnetically conductive spring sheet, which has a fixed end and a movable end; The magnetically conductive spring is fixedly connected to the iron core / armature through the fixed end, and the movable end of the magnetically conductive spring is located between the armature and the iron core, and is movably engaged.

[0009] The above-mentioned technical measures are designed to address the unique characteristics of the snap-action electromagnetic relay. By setting a self-elastically deformable magnetic conductive spring between the armature and the iron core, the magnetic gap can be effectively reduced to increase the magnetic attraction force. During the contact release process, the contact disconnection is accelerated to reduce the arcing time, thereby achieving the technical effect of controlling a large contact gap with a small excitation energy consumption in the snap-action electromagnetic relay.

[0010] Among the aforementioned technical measures, the magnetic spring sheet possesses the inherent characteristic of elastic deformation. This allows for the reduction of the magnetic gap in a snap-fit ​​electromagnetic relay using a single-structure spring sheet. This results in a stable and simple mounting structure for the magnetic spring sheet on the core / armature, stable and durable elastic deformation of the spring sheet, low technical requirements for the design structure of the mating core and armature, easy and efficient assembly, good vibration and shock resistance in the finished electromagnetic relay, and no special technical requirements for installation location and operation in end-product applications. In summary, compared to existing snap-fit ​​electromagnetic relays that reduce magnetic gap, these technical measures maintain good structural stability with a simple structure, ensure reliability during service, and effectively reduce manufacturing costs.

[0011] As one of the preferred technical solutions, corresponding to the compressed position of the movable end of the magnetic conductive spring between the armature and the iron core, the pole shoe of the iron core is formed with an inwardly concave structure to accommodate the movable end of the compressed magnetic conductive spring, and the bottom surface of the attraction space and the attraction surface of the iron core are matched with a step relationship. When the contacts are engaged under the excitation of the coil, the magnetic spring sheet compressed by the armature has its movable end located within the engagement clearance space, and the armature-side engagement surface of the armature is engaged with the core-side engagement surface of the iron core.

[0012] Furthermore, the concave depth of the attraction clearance space on the iron core is at least equal to the thickness of the movable end of the magnetic conductive spring sheet.

[0013] The above-mentioned technical measures are based on the special feature of reducing the magnetic gap between the armature and the iron core pole shoe by using an elastically deformable magnetic spring sheet, and based on the structural thickness of the magnetic spring sheet, so that the movable end of the magnetic spring sheet compressed by the armature in the attracted state can be in the attracted clearance space through the attraction clearance space on the iron core pole shoe, ensuring that the armature side attraction surface of the armature and the iron core side attraction surface of the iron core can reliably attract each other without being weakened or disturbed by the structural thickness of the magnetic spring sheet, and ensuring that the reliability of the engagement state of the snap-action electromagnetic relay is not affected.

[0014] As one of the preferred technical solutions, in the de-energized contact release state of the coil, the movable end of the magnetic spring sheet forms a contact engagement relationship with the armature / iron core to be engaged. This technical measure ensures that the magnetic spring sheet's function of reducing the magnetic gap can be stably performed by applying a certain pre-pressure to the magnetic spring sheet in the released state, and minimizes the dispersion of the pull-in voltage as much as possible.

[0015] As one of the preferred technical solutions, the magnetic spring sheet has a fixed end with an elastic deformation section and a movable end, both integrally formed. The fixed end and the movable end form a U-shaped loop fit structure, and they fit at an acute angle. The elastic deformation section is located between the fixed end and the movable end, providing elastic deformation. This magnetic spring sheet, on the one hand, satisfies the requirement of elastic deformation while having a simplified forming structure, making it easy to process and assemble, and ensuring the stability and reliability of the assembled structure; on the other hand, it adapts to the magnetic gap space structure between the armature and the iron core pole shoe of a snap-fit ​​electromagnetic relay, so that the fixed end and the movable end form a U-shaped angle design that tends to change into a V-shape, ensuring that they can effectively fit the magnetic gap contour structure between the armature and the iron core pole shoe.

[0016] Furthermore, the elastic deformation part of the magnetic conductive sheet is a U-shaped elastic winding structure, and the transition of the U-shaped elastic winding of the elastic deformation part is a rounded corner structure, and the extension structures at both ends of the winding structure are matched with an acute angle relationship. Alternatively, the elastic deformation portion of the magnetic conductive sheet is at least one layer of V-shaped elastic winding structure, and the extension structures at both ends of the winding structure of the elastic deformation portion are matched with an acute angle relationship.

[0017] The above-mentioned technical measures are designed to enable the magnetically conductive spring sheet to perform its function, and can achieve reliable and durable elastic deformation, especially the U-shaped elastic winding structure.

[0018] Furthermore, the movable end of the magnetically conductive elastic sheet is formed in a bent structure at the corresponding extension structure of the elastically deformable part; The acute angle between the movable end and the fixed end of the magnetic conductive elastic sheet is smaller than the acute angle between the extended structures at both ends of the winding structure of the elastic deformation part.

[0019] The above-mentioned technical measures are based on the magnetic gap profile structure of the magnetic spring sheet to adapt to the magnetic gap between the armature and the iron core pole shoe. By forming the movable end with a bending structure, it not only enhances the elastic deformability of the magnetic spring sheet, but also enables the arrangement structure of the movable end of the magnetic spring sheet to effectively match the dynamic cooperation relationship between the magnetic spring sheet and the armature and iron core during the compression process of the magnetic spring sheet. This ensures the stable and long-term arrangement of the magnetic spring sheet between the armature and the iron core, and reduces the interference of the magnetic spring sheet on the attraction contact between the armature and the iron core.

[0020] As one of the preferred technical solutions, the magnetically conductive spring sheet is fixedly connected to the iron core through the fixed end; Correspondingly, the fixed end of the magnetically conductive spring sheet has a ring-shaped structure and nested holes; The magnetic conductive spring sheet is fitted and fixed to the pole shoe of the iron core through the nesting hole at the fixed end.

[0021] The above-mentioned technical measures, as a preferred installation structure for the magnetic spring between the armature and the iron core, enable the magnetic spring to be stably installed on the iron core, and the movable end is effectively located between the magnetic gap between the armature and the iron core. The installation structure of the magnetic spring will not interfere with the attraction structure between the armature and the iron core. Moreover, the magnetic spring is easy, efficient and stable to install on the iron core, which is conducive to controlling manufacturing costs (especially assembly costs) and has good long-term performance during service.

[0022] Furthermore, the pole shoe of the iron core has a core-side fixing ring groove formed with a radially concave structure; The inner diameter of the nested hole on the magnetic spring sheet is adapted to the inner diameter of the core-side fixing ring groove on the iron core; and the thickness at the inner edge of the nested hole on the magnetic spring sheet is adapted to the axial height of the core-side fixing ring groove on the iron core. Furthermore, the nested hole is a circumferentially unclosed, elastically tensionable structure; The magnetic conductive spring sheet is fitted and fixed to the iron core side fixing ring groove of the iron core through the nesting hole.

[0023] The above-mentioned technical measures are based on the set structure of the magnetic spring sheet on the iron core, which enables the magnetic spring sheet to be stably and elastically self-lockingly nested on the iron core. Moreover, this nesting structure helps to control the risk of scratching the iron core during the set-in process.

[0024] As one of the preferred technical solutions, the magnetically conductive spring sheet is fixedly connected to the armature through the fixed end; Correspondingly, the fixed end of the magnetically conductive sheet is a flat sheet structure; The fixed end of the magnetic spring is fixedly connected to the armature by welding and / or riveting.

[0025] The above-mentioned technical measures, as an alternative installation structure for the magnetic spring between the armature and the iron core, enable the magnetic spring to be stably installed on the armature, and the movable end is effectively located between the magnetic gap between the armature and the iron core. The installation structure of the magnetic spring will not interfere with the attraction structure between the armature and the iron core. Moreover, the magnetic spring is easy, efficient and stable to install on the armature, which is conducive to controlling manufacturing costs (especially assembly costs) and has good long-term performance during service.

[0026] Furthermore, the armature-side suction surface of the armature has an armature-side fixing groove formed with an inward concave structure. The fixed end of the magnetic conductive spring is fixedly connected to the armature-side fixing groove on the armature by welding and / or riveting.

[0027] Furthermore, the concave depth of the fixing groove on the armature side of the armature is at least equal to the thickness of the fixing end of the magnetic spring sheet.

[0028] The above-mentioned technical measures enable the magnetic spring to be installed on the armature without affecting the attraction structure between the armature and the iron core. In other words, the installation structure of the magnetic spring on the armature will not interfere with the attraction structure between the armature and the iron core.

[0029] The beneficial technical effects of the present invention are as follows: the above-mentioned technical measures are designed to address the special characteristics of the snap-action electromagnetic relay. By setting a self-elastically deformable magnetic conductive spring between the armature and the iron core, the magnetic gap can be effectively reduced and the magnetic circuit attraction force can be increased. In the process of contact release, the contact disconnection is accelerated and the arcing time is reduced. Thus, the snap-action electromagnetic relay achieves the technical effect of controlling a larger contact gap with a smaller excitation energy consumption.

[0030] The above-mentioned technical measures, because the simple magnetic spring itself has excellent elastic deformation capability, can achieve the effect of reducing the magnetic gap of the snap-fit ​​electromagnetic relay with a single spring. This makes the installation structure of the magnetic spring on the iron core / armature stable and simple, and the elastic deformation of the magnetic spring is stable and durable. The design and technical requirements of the iron core and armature are low, and it is easy to assemble easily, efficiently and at low cost. The finished snap-fit ​​electromagnetic relay has good vibration and shock resistance (at least the structure at the magnetic spring), and there are no special technical requirements for the installation position and operation in the end product application.

[0031] Therefore, compared with existing snap-action electromagnetic relays that can reduce magnetic gap, the above-mentioned technical measures can maintain good structural stability with a simple structure, ensure reliability during service, and effectively reduce manufacturing costs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of one structure of the present invention.

[0033] Figure 2 for Figure 1 A schematic diagram of the assembly structure of the iron core, armature, magnetic guide spring, and yoke.

[0034] Figure 3 for Figure 1 and Figure 2 A schematic diagram of the mating structure of the iron core and the magnetic spring sheet.

[0035] Figure 4 for Figure 1 , Figure 2 and Figure 3 A schematic diagram of the structure of the magnetic conductive spring sheet.

[0036] Figure 5 for Figure 1 , Figure 2 and Figure 3A schematic diagram of the iron core structure.

[0037] Figure 6 This is another structural schematic diagram of the present invention.

[0038] Figure 7 for Figure 6 A schematic diagram of the assembly structure of the iron core, armature, magnetic guide spring, and yoke.

[0039] Figure 8 for Figure 6 and Figure 7 A schematic diagram of the assembly structure of the armature and the magnetic spring sheet.

[0040] Figure 9 for Figure 6 , Figure 7 and Figure 8 A schematic diagram of the structure of the magnetic conductive spring sheet.

[0041] Figure 10 for Figure 6 and Figure 7 A schematic diagram of the iron core structure.

[0042] Figure 11 for Figure 4 / Figure 9 The diagram shows a lateral orthographic projection of the magnetically conductive spring sheet.

[0043] Figure 12 The electromagnetic simulation test curves of the electromagnetic relay of the present invention under different magnetic gap conditions are shown.

[0044] Meaning of the codes in the image: 1—Coil frame; 2—Iron core; 21—Pole shoe; 22—Iron core side suction surface; 23—Suction clearance space; 24—Iron core side fixing ring groove; 3—Armature; 31—Armature side contact surface; 32—Armature side fixing groove; 4—Magnetic conductive spring sheet; 41—Fixed end; 411—Nesting hole; 412—Riveting hole; 42—Elastic deformation part; 43—Moving end; 5—Moving spring assembly; 51—Moving spring leaf; 52—Moving contact; 6—Stationary spring assembly; 61—Stationary spring leaf; 62—Stationary contact; 7—Yoke. Detailed Implementation

[0045] This invention relates to the field of electromagnetic relay technology, specifically an energy-saving snap-action electromagnetic relay. The main technical solution of this invention will be described in detail below with reference to several embodiments. Embodiment 1 is illustrated in conjunction with the accompanying drawings—that is… Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 11 The technical solution of the present invention will be clearly and thoroughly explained; Embodiment 3 is illustrated in conjunction with the accompanying drawings. Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 The technical solution of the present invention is clearly and in detail explained; although other embodiments are not shown in separate drawings, their main structure can still be referred to the drawings of Embodiment 1 or Embodiment 3.

[0046] It should be noted that the accompanying drawings of this invention are schematic, and unnecessary details have been simplified to clarify the technical objectives of this invention, so as to avoid obscuring the technical solutions contributed by this invention to the prior art. Furthermore, the terms "approximately" or "basically" used below to refer to quantities or fit relationships mean that reasonable assembly and processing errors are allowed in the industry, and do not literally describe absolute quantities or fit relationships.

[0047] Example 1 See Figure 1 and Figure 2 As shown, this invention is a snap-fit ​​electromagnetic relay that can effectively reduce the magnetic gap and increase the magnetic circuit attraction. It includes the main structure of the snap-fit ​​electromagnetic relay, comprising a coil frame 1 and a magnetic circuit portion and a contact portion mounted on the coil frame 1. The magnetic circuit portion mainly consists of a coil, an iron core 2, a yoke 7, and an armature 3 mounted on the coil frame 1. The armature 3 is fitted to the blade edge of the yoke 7 via an L-shaped moving spring 51 (or a separate compression spring) of the moving spring assembly 5 in a snap-fit ​​manner, extending to the outside of the pole shoe 21 of the iron core 2. A magnetic circuit gap fit is formed between the armature 3 and the iron core 2. The contact part mainly consists of a moving spring assembly 5 and a stationary spring assembly 6. The moving spring assembly 5 has a moving spring plate 51 and moving contacts 52 arranged on the moving spring plate 51. The stationary spring assembly 6 has a stationary spring plate 61 and stationary contacts 62 arranged on the stationary spring plate 61. As mentioned above, the moving spring plate 51 also functions as a compression spring structure, and is therefore fixed to the surface of the armature 3 opposite to the iron core 2 and extends, so that the moving contacts 52 extend beyond the coverage area of ​​the armature 3 to one end of the coil frame 1. The stationary spring plate 61 is assembled on the coil frame 1, so that the stationary contacts 62 are located inside the flipping direction of the moving spring plate 51, and a contact gap fit is formed between the stationary contacts 62 and the moving contacts 52. In order to reduce the magnetic gap of the aforementioned snap-action electromagnetic relay, a magnetic conductive structure is provided between the aforementioned armature 3 and the iron core 2.

[0048] Therefore, the technical contribution of this invention, as a snap-action electromagnetic relay that can effectively reduce the magnetic gap and increase the magnetic circuit attraction, lies in the space between the iron core 2 and the armature 3 mounted on the coil frame 1 of the snap-action electromagnetic relay. It requires that the armature 3 extend to the outside of the pole shoe 21 of the iron core 2 and be able to flip, which is a technical prerequisite. Under this technical prerequisite, a magnetically conductive structure is provided between the armature 3 and the iron core 2.

[0049] For details, see Figure 2 , Figure 3 , Figure 4 and Figure 11 As shown, the aforementioned magnetically conductive structure is a self-elastically deformable magnetically conductive spring sheet 4, which has an integrally formed fixed end 41, an elastically deformable part 42, and a movable end 43. The fixed end 41 and the movable end 43 form a U-shaped winding fit structure. The elastically deformable part 42 is located between the fixed end 41 and the movable end 43, providing elastic deformation. According to its functional requirements in electromagnetic relay products, the aforementioned magnetically conductive spring sheet 4 should have good magnetic permeability, coercivity, low remanence, and resistance to mechanical fatigue. Therefore, it is preferably formed from materials such as iron-nickel alloy or iron-cobalt-vanadium alloy.

[0050] More specifically, such as Figure 11As shown, in order to adapt to the angular deformation space that forms the magnetic gap between the armature 3 and the iron core 2 due to the swinging motion of the armature 3, the fixed end 41 and the movable end 43 are fitted with an acute angle relationship, that is, there is an included angle β between the fixed end 41 and the movable end 43. The value range of the included angle β is usually 35° to 55°, and it is adjusted according to the magnetic gap design of the current relay product, such as 35°, 40°, 45° or 55°. The elastic deformation part 42 of the magnetic conductive spring sheet 4 serves as a winding transition between the fixed end 41 and the movable end 43, and provides elastic deformation performance. It adopts a U-shaped elastic winding structure. The U-shaped elastic winding transition has a rounded corner structure, and the extension structures at both ends of the winding structure are matched with an acute angle relationship. That is, there is an included angle α between the extension structures at both ends of the U-shaped elastic winding of the elastic deformation part 42. The value of the included angle α is usually in the range of 40° to 60°, and is specifically adjusted according to the magnetic gap design of the current relay product, such as 40°, 45°, 50°, 60°, etc. Thus, the acute angle between the movable end 43 and the fixed end 41 of the magnetic spring sheet 4 is smaller than the acute angle between the extended structures at both ends of the winding structure of the aforementioned elastic deformation part 42. In order to accommodate the compression action of the magnetic spring sheet 4 during the attraction process between the armature 3 and the iron core 2, the fixed end 41 of the magnetic spring sheet 4 is formed in a straight line extension structure in the corresponding extension structure of the aforementioned elastic deformation part 42, and the movable end 43 of the magnetic spring sheet 4 is formed in a bent structure in the corresponding extension structure of the aforementioned elastic deformation part 42. The bent structure of the movable end 43 can also reliably enhance the elastic deformability of the magnetic spring sheet 4.

[0051] See Figure 1 , Figure 2 and Figure 3 As shown, the magnetic spring sheet 4 of the above structure is fixedly connected to the iron core 2 via the fixed end 41. The movable end 43 of the magnetic spring sheet 4 is located between the armature 3 and the iron core 2, forming a movable engagement relationship with the opposing armature 3. The aforementioned movable engagement relationship, as the optimal choice, is that when the coil is de-energized and the contacts are released, the movable end 43 of the magnetic spring sheet 4 forms a contact engagement relationship with the armature 3 to be engaged. That is, the end of the movable end 43 abuts against the armature-side attraction surface 31 of the armature 3, and the armature 3 provides a relatively small pre-pressure to the magnetic spring sheet 4 to ensure that the dispersion of the attraction voltage is sufficiently small, which is beneficial to improving the magnetic circuit attraction force and further reliably achieving the energy-saving effect.

[0052] See Figure 2 , Figure 3 and Figure 4As shown, to ensure the fixed connection of the fixed end 41 of the magnetic spring 4 to the iron core 2, the fixed end 41 of the magnetic spring 4 has an annular structure with a nesting hole 411. The inner diameter of the nesting hole 411 is basically adapted to the corresponding fixed position on the iron core 2—that is, the inner diameter of the iron core-side fixing ring groove 24 described below. Furthermore, the thickness at the inner edge of the nesting hole 411 is basically adapted to the corresponding fixed position on the iron core 2—that is, the axial height of the iron core-side fixing ring groove 24 described below. The magnetic spring 4 is fitted and fixed to the root of the pole shoe 21 of the iron core 2 through the nesting hole 411 of the fixed end 41, so that the movable end 43 winds back to the top of the pole shoe 21 in a U-shaped loop structure.

[0053] See Figure 5 As shown, in order to satisfy the fitting and fixing of the magnetic spring sheet 4, at the root of the pole shoe 21 of the iron core 2 - that is, at the transition between the pole shoe 21 and the iron core 2 body, a core-side fixing ring groove 24 is formed in a radially concave structure around the iron core 2. The core-side fixing ring groove 24 is adapted to the nesting hole 411 structure on the magnetic spring sheet 4 according to the above relationship.

[0054] See Figure 2 , Figure 3 and Figure 4 As shown, the magnetically conductive spring sheet 4 with the above structure needs to be fitted and fixed in the core-side fixing ring groove 24 on the iron core 2. Due to the diameter difference between the nesting hole 411 and the iron core 2, this is quite difficult and easily damages the iron core 2. Therefore, as shown... Figure 4 As shown, the nesting hole 411 of the magnetic conductive spring sheet 4 is a circumferentially open, elastically tensionable structure. That is, a notch for elastic tension deformation is opened on the side of the fixed end 41 of the magnetic conductive spring sheet 4 away from the movable end 43. In this way, the magnetic conductive spring sheet 4 is axially fitted and fixed to the core-side fixing ring groove 24 of the iron core 2 through the nesting hole 411 of the elastically tensionable structure, and is self-locked and fixed at the core-side fixing ring groove 24 by the elastic tension deformation of the nesting hole 411.

[0055] See Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the magnetic spring sheet 4, fixed on the iron core 2 according to the above structure, has its movable end 43 extending back and extending between the armature 3 and the iron core 2 through the elastic deformation part 42, forming a movable engagement relationship with the opposing armature 3 to reduce the magnetic gap between the armature 3 and the iron core 2. However, during the contact engagement process when the coil is excited, the armature-side engagement surface 31 of the armature 3 needs to engage with the iron core-side engagement surface 22 at the pole shoe 21 of the iron core 2. This will compress the magnetic spring sheet 4. Since the magnetic spring sheet 4 inevitably has a physical structural thickness, this will cause the movable end 43 of the compressed magnetic spring sheet 4 to be located between the armature-side engagement surface 31 and the iron core-side engagement surface 22, affecting the engagement reliability. Therefore, corresponding to the compressed position of the movable end 43 of the magnetic spring 4 between the armature 3 and the iron core 2, a recessed space 23 is formed on the pole shoe 21 of the iron core 2 to accommodate the movable end 43 of the compressed magnetic spring 4. The recessed depth of the space 23 is approximately equal to the thickness of the movable end 43 of the magnetic spring 4, thus creating a stepped fit between the bottom surface of the space 23 and the iron core-side contact surface 22. When the coil is energized and the contacts are engaged, the movable end 43 of the magnetic spring 4 compressed by the armature 3 is located within the space 23. The armature-side contact surface 31 of the armature 3 and the iron core-side contact surface 22 of the iron core 2 are engaged, and the magnetic spring 4 does not interfere with the engagement between the armature-side contact surface 31 and the iron core-side contact surface 22.

[0056] Example 2 The rest of the content of this embodiment is the same as that of embodiment 1, except that: The fixed end of the magnetically conductive spring sheet is welded and fixed to the root of the pole shoe of the iron core; Correspondingly, the core-side fixing ring groove structure on the iron core can be removed, and the fixing end of the magnetic spring sheet can be either nested or not.

[0057] Example 3 See Figure 6 and Figure 7As shown, this invention is a snap-fit ​​electromagnetic relay that can effectively reduce the magnetic gap and increase the magnetic circuit attraction. It includes the main structure of the snap-fit ​​electromagnetic relay, comprising a coil frame 1 and a magnetic circuit portion and a contact portion mounted on the coil frame 1. The magnetic circuit portion mainly consists of a coil, an iron core 2, a yoke 7, and an armature 3 mounted on the coil frame 1. The armature 3 is fitted to the blade edge of the yoke 7 via an L-shaped moving spring 51 (or a separate compression spring) of the moving spring assembly 5 in a snap-fit ​​manner, extending to the outside of the pole shoe 21 of the iron core 2. A magnetic circuit gap fit is formed between the armature 3 and the iron core 2. The contact part mainly consists of a moving spring assembly 5 and a stationary spring assembly 6. The moving spring assembly 5 has a moving spring plate 51 and moving contacts 52 arranged on the moving spring plate 51. The stationary spring assembly 6 has a stationary spring plate 61 and stationary contacts 62 arranged on the stationary spring plate 61. As mentioned above, the moving spring plate 51 also functions as a compression spring structure, and is therefore fixed to the surface of the armature 3 opposite to the iron core 2 and extends, so that the moving contacts 52 extend beyond the coverage area of ​​the armature 3 to one end of the coil frame 1. The stationary spring plate 61 is assembled on the coil frame 1, so that the stationary contacts 62 are located inside the flipping direction of the moving spring plate 51, and a contact gap fit is formed between the stationary contacts 62 and the moving contacts 52. In order to reduce the magnetic gap of the aforementioned snap-action electromagnetic relay, a magnetic conductive structure is provided between the aforementioned armature 3 and the iron core 2.

[0058] Therefore, the technical contribution of this invention, as a snap-action electromagnetic relay that can effectively reduce the magnetic gap and increase the magnetic circuit attraction, lies in the space between the iron core 2 and the armature 3 mounted on the coil frame 1 of the snap-action electromagnetic relay. It requires that the armature 3 extend to the outside of the pole shoe 21 of the iron core 2 and be able to flip, which is a technical prerequisite. Under this technical prerequisite, a magnetically conductive structure is provided between the armature 3 and the iron core 2.

[0059] For details, see Figure 7 , Figure 8 , Figure 9 and Figure 11 As shown, the aforementioned magnetically conductive structure is a self-elastically deformable magnetically conductive spring sheet 4, which has an integrally formed fixed end 41, an elastically deformable part 42, and a movable end 43. The fixed end 41 and the movable end 43 form a U-shaped winding fit structure. The elastically deformable part 42 is located between the fixed end 41 and the movable end 43, providing elastic deformation. According to its functional requirements in electromagnetic relay products, the aforementioned magnetically conductive spring sheet 4 should have good magnetic permeability, coercivity, low remanence, and resistance to mechanical fatigue. Therefore, it is preferably formed from materials such as iron-nickel alloy or iron-cobalt-vanadium alloy.

[0060] More specifically, such as Figure 11As shown, in order to adapt to the angular deformation space that forms the magnetic gap between the armature 3 and the iron core 2 due to the swinging motion of the armature 3, the fixed end 41 and the movable end 43 are fitted with an acute angle relationship, that is, there is an included angle β between the fixed end 41 and the movable end 43. The value range of the included angle β is usually 35° to 55°, and it is adjusted according to the magnetic gap design of the current relay product, such as 35°, 40°, 45° or 55°. The elastic deformation part 42 of the magnetic conductive spring sheet 4 serves as a winding transition between the fixed end 41 and the movable end 43, and provides elastic deformation performance. It adopts a U-shaped elastic winding structure. The U-shaped elastic winding transition has a rounded corner structure, and the extension structures at both ends of the winding structure are matched with an acute angle relationship. That is, there is an included angle α between the extension structures at both ends of the U-shaped elastic winding of the elastic deformation part 42. The value of the included angle α is usually in the range of 40° to 60°, and is specifically adjusted according to the magnetic gap design of the current relay product, such as 40°, 45°, 50°, 60°, etc. Thus, the acute angle between the movable end 43 and the fixed end 41 of the magnetic spring sheet 4 is smaller than the acute angle between the extended structures at both ends of the winding structure of the aforementioned elastic deformation part 42. In order to accommodate the compression action of the magnetic spring sheet 4 during the attraction process between the armature 3 and the iron core 2, the fixed end 41 of the magnetic spring sheet 4 is formed in a straight line extension structure in the corresponding extension structure of the aforementioned elastic deformation part 42, and the movable end 43 of the magnetic spring sheet 4 is formed in a bent structure in the corresponding extension structure of the aforementioned elastic deformation part 42. The bent structure of the movable end 43 can also reliably enhance the elastic deformability of the magnetic spring sheet 4.

[0061] See Figure 6 , Figure 7 and Figure 8 As shown, the magnetic spring sheet 4 of the above structure is fixedly connected to the armature 3 via the fixed end 41. The movable end 43 of the magnetic spring sheet 4 is located between the armature 3 and the iron core 2, forming a movable engagement relationship with the iron core 2. The aforementioned movable engagement relationship is optimally chosen so that, in the de-energized contact release state of the coil, the movable end 43 of the magnetic spring sheet 4 forms a contact engagement relationship with the iron core 2 to be engaged, that is, the end of the movable end 43 abuts against the pole shoe 21 of the iron core 2 (specifically, the following attraction clearance space 23). The armature 3 provides a relatively small pre-pressure to the magnetic spring sheet 4 to ensure that the dispersion of the attraction voltage is small enough, which is beneficial to improving the magnetic circuit attraction force and further reliably exerting the energy-saving effect.

[0062] See Figure 7 , Figure 8 and Figure 9As shown, to ensure the fixed connection of the fixed end 41 of the magnetic spring 4 to the armature 3, the fixed end 41 of the magnetic spring 4 is a flat sheet structure, and a riveting hole 412 is provided in the central area of ​​the flat sheet structure of the fixed end 41. Correspondingly, to accommodate the fixed connection of the magnetic spring 4, an armature-side fixing groove 32 is formed in a concave structure at the armature-side contact surface 31 of the armature 3. The opening position of the armature-side fixing groove 32 should avoid the area that contacts the iron core-side contact surface 22. In order to avoid the magnetic spring 4 fixedly connected to the armature 3 interfering with the contact between the armature 3 and the iron core 2, the concave depth of the aforementioned armature-side fixing groove 32 on the armature 3 is basically equal to the structural thickness of the fixed end 41 of the magnetic spring 4. The fixed end 41 of the aforementioned magnetic spring sheet 4 is fixedly connected to the armature side fixed groove 32 on the armature 3 by a riveting structure, so that the movable end 43 extends downward through the elastic deformation part 42 and abuts against the attraction clearance space 33 of the pole shoe 21 described below.

[0063] See Figure 6 , Figure 7 and Figure 10 As shown, the magnetic spring sheet 4, fixed to the armature 3 according to the above structure, has its movable end 43 extending back and extending between the armature 3 and the iron core 2 through the elastic deformation part 42, forming a movable engagement relationship with the opposing iron core 2 to reduce the magnetic gap between the armature 3 and the iron core 2. However, during the contact engagement process when the coil is excited, the armature-side engagement surface 31 of the armature 3 needs to engage with the iron core-side engagement surface 22 at the pole shoe 21 of the iron core 2. This will compress the magnetic spring sheet 4. Since the magnetic spring sheet 4 inevitably has a physical structural thickness, this will cause the movable end 43 of the compressed magnetic spring sheet 4 to be located between the armature-side engagement surface 31 and the iron core-side engagement surface 22, affecting the engagement reliability. Therefore, corresponding to the compressed position of the movable end 43 of the magnetic spring 4 between the armature 3 and the iron core 2, a recessed space 23 is formed on the pole shoe 21 of the iron core 2 to accommodate the movable end 43 of the compressed magnetic spring 4. The recessed depth of the space 23 is approximately equal to the thickness of the movable end 43 of the magnetic spring 4, thus creating a stepped fit between the bottom surface of the space 23 and the iron core-side contact surface 22. When the coil is energized and the contacts are engaged, the movable end 43 of the magnetic spring 4 compressed by the armature 3 is located within the space 23. The armature-side contact surface 31 of the armature 3 and the iron core-side contact surface 22 of the iron core 2 are engaged, and the magnetic spring 4 does not interfere with the engagement between the armature-side contact surface 31 and the iron core-side contact surface 22.

[0064] Example 4 The rest of the content of this embodiment is the same as that of embodiment 3, except that: The fixed end of the magnetic spring is welded and fixed in the fixed groove on the armature side of the armature.

[0065] Example 5 The rest of the content of this embodiment is the same as that of embodiment 3, except that: The depth of the recessed groove on the armature side of the armature is greater than the thickness of the fixed end of the magnetic spring.

[0066] Example 6 The rest of the content of this embodiment is the same as that of embodiment 1 or embodiment 3, except that: The concave depth of the attraction clearance space on the iron core is greater than the thickness of the movable end of the magnetic spring sheet.

[0067] Example 7 The rest of the content of this embodiment is the same as that of embodiment 1 or embodiment 3, except that: The elastic deformation part of the magnetic spring sheet is a V-shaped elastic winding structure, that is, the overall structure of the magnetic spring sheet is V-shaped spring.

[0068] Although this embodiment can achieve the technical effect of reducing the magnetic gap by using a magnetically conductive spring sheet, the forming structure of the magnetically conductive spring sheet has relatively poor elastic deformability and durability. In addition, the V-shaped bending and winding structure requires a large winding space, which will affect the fit between the armature and the iron core to a certain extent, so it is not the first choice.

[0069] Based on this embodiment, as an alternative structure, the elastic deformation part of the magnetic conductive sheet can also be configured as a two-layer V-shaped elastic winding structure, that is, the winding part of the entire elastic deformation part is W-shaped.

[0070] Example 8 The rest of the content of this embodiment is the same as that of embodiment 1, except that: The magnetic conductive sheet has a layered structure in the thickness direction, for example, two layers are formed in the structural thickness to improve the mechanical properties of the formed magnetic conductive sheet.

[0071] To verify the technical effect of the present invention, electromagnetic simulation tests were conducted on the snap-fit ​​electromagnetic relay designed in Embodiment 1 above, according to different magnetic gaps. The test results are as follows: Figure 12 As shown. Test results show that the present invention can effectively increase the initial attraction force of the electromagnetic relay by 80%, and exhibits a more significant technical effect as the magnetic gap increases, which can greatly reduce the power consumption and cost of the electromagnetic relay.

[0072] The above embodiments are only used to illustrate the present invention and are not intended to limit it.

[0073] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions of the above embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the present invention.

Claims

1. An energy-saving snap-action electromagnetic relay, comprising an iron core (2) and an armature (3) mounted on a coil frame (1); The armature (3) extends to the outside of the pole shoe (21) of the iron core (2), and a magnetic conductive structure is provided between the armature (3) and the iron core (2); Its features are: The magnetically conductive structure is a magnetically conductive elastic sheet (4) that can elastically deform itself, having a fixed end (41) and a movable end (43). The magnetic spring sheet (4) is fixedly connected to the iron core (2) / armature (3) through the fixed end (41), and the movable end (43) of the magnetic spring sheet (4) is located between the armature (3) and the iron core (2) and is in movable cooperation.

2. The energy-saving snap-action electromagnetic relay according to claim 1, characterized in that: Corresponding to the compressed position of the movable end (43) of the magnetic spring (4) between the armature (3) and the iron core (2), the pole shoe (21) of the iron core (2) is formed with an inward concave structure to accommodate the movable end (43) of the compressed magnetic spring (4), and the bottom surface of the attraction space (23) and the attraction surface (22) of the iron core are fitted in a stepped relationship; When the contacts are engaged under the excitation of the coil, the magnetic spring sheet (4) compressed by the armature (3) has its movable end (43) in the engagement clearance space (23), and the armature side engagement surface (31) of the armature (3) and the core side engagement surface (22) of the core (2) are engaged.

3. The energy-saving snap-action electromagnetic relay according to claim 2, characterized in that: The concave depth of the attraction clearance space (23) on the iron core (2) is at least equal to the thickness of the movable end (43) of the magnetic spring sheet (4).

4. The energy-saving snap-action electromagnetic relay according to claim 1, characterized in that: When the coil is de-energized and the contact is released, the movable end (43) of the magnetic spring sheet (4) forms a contact engagement relationship with the armature (3) / iron core (2) to be engaged.

5. The energy-saving snap-action electromagnetic relay according to claim 1, 2 or 4, characterized in that: The magnetic conductive sheet (4) has a fixed end (41), an elastic deformation part (42), and a movable end (43) with an integrally formed structure. The fixed end (41) and the movable end (43) form a U-shaped winding fit structure, and the fixed end (41) and the movable end (43) fit at an acute angle. The elastic deformation part (42) is located between the fixed end (41) and the movable end (43) and provides elastic deformation.

6. The energy-saving snap-action electromagnetic relay according to claim 5, characterized in that: The elastic deformation part (42) of the magnetic conductive sheet (4) is a U-shaped elastic winding structure, and the U-shaped elastic winding transition of the elastic deformation part (42) is a rounded corner structure, and the extension structures at both ends of the winding structure are matched with acute angles. Alternatively, the elastic deformation portion of the magnetic conductive sheet is at least one layer of V-shaped elastic winding structure, and the extension structures at both ends of the winding structure of the elastic deformation portion are matched with an acute angle relationship.

7. The energy-saving snap-action electromagnetic relay according to claim 6, characterized in that: The movable end (43) of the magnetic conductive sheet (4) is formed in a bent structure at the corresponding extension structure of the elastic deformation part (42); The acute angle between the movable end (43) and the fixed end (41) of the magnetic conductive sheet (4) is smaller than the acute angle between the extended structures at both ends of the winding structure of the elastic deformation part (42).

8. The energy-saving snap-action electromagnetic relay according to claim 1, characterized in that: The magnetic conductive spring sheet (4) is fixedly connected to the iron core (2) through the fixed end (41); Correspondingly, the fixed end (41) of the magnetic conductive sheet (4) is a ring structure with a nested hole (411). The magnetic conductive sheet (4) is fitted and fixed at the pole shoe (21) of the iron core (2) through the nesting hole (411) of the fixed end (41).

9. The energy-saving snap-action electromagnetic relay according to claim 8, characterized in that: The iron core (2) has a core-side fixing ring groove (24) formed with a radially concave structure at the pole shoe (21). The inner diameter of the nesting hole (411) on the magnetic spring sheet (4) is adapted to the inner diameter of the core-side fixing ring groove (24) on the iron core (2); and the thickness at the inner edge of the nesting hole (411) on the magnetic spring sheet (4) is adapted to the axial height of the core-side fixing ring groove (24) on the iron core (2). Furthermore, the nested hole (411) is an elastically tensionable structure that is not closed in the circumferential direction; The magnetic conductive spring sheet (4) is fitted and fixed in the core-side fixing ring groove (24) of the iron core (2) through the nesting hole (411).

10. The energy-saving snap-action electromagnetic relay according to claim 1, characterized in that: The magnetic conductive spring sheet (4) is fixedly connected to the armature (3) through the fixed end (41); Correspondingly, the fixed end (41) of the magnetic conductive sheet (4) is a flat sheet structure; The fixed end (41) of the magnetic spring sheet (4) is fixedly connected to the armature (3) by welding and / or riveting.

11. The energy-saving snap-action electromagnetic relay according to claim 10, characterized in that: The armature side suction surface (31) of the armature (3) has an armature side fixing groove (32) formed with an inward concave structure. The fixed end (41) of the magnetic guide spring (4) is fixedly connected to the armature side fixing groove (32) on the armature (3) by welding and / or riveting structure.

12. The energy-saving snap-action electromagnetic relay according to claim 11, characterized in that: The indentation depth of the fixed groove (32) on the armature side of the armature (3) is at least equal to the thickness of the fixed end (41) of the magnetic spring sheet (4).

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