Magnetic circuit part and electromagnetic relay

Abstract

The utility model discloses a magnetic circuit part and an electromagnetic relay, the magnetic circuit part is used for a relay, the magnetic circuit part comprises a coil rack, a movable iron core and a magnetic circuit closing part, the movable iron core can be movably arranged in a shaft hole of the coil rack along the axial direction of the coil rack, and the magnetic circuit closing part is arranged on one side of the moving direction of the movable iron core. The movable iron core is used for being attracted with the movable iron core when the contact of the relay is in a closed state; the relay further comprises a plurality of elastic pieces used for providing counter force when the contacts of the relay are broken, the elastic pieces are located between the movable iron core and the magnetic circuit closing component, and in the process that the movable iron core moves in the direction enabling the contacts of the relay to be closed, at least two elastic pieces are sequentially compressed at different stages. With the adoption of the structure, the quick action of the relay can be realized on the premise that the counter-force value is not reduced.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a magnetic circuit component and an electromagnetic relay. Background Technology

[0002] An electromagnetic relay is an electronic control device that is commonly used in automatic control circuits. It is essentially an "automatic switch" that uses a smaller current to control a larger current, and thus plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] In DC load applications, ensuring rapid contact action, shortening operating time, and extending electrical life are crucial for electromagnetic relays. To achieve this, increasing the electromagnetic force is typically employed to ensure reliable contact closure. However, when product size is limited, increasing the electromagnetic force often requires increasing coil power consumption. This leads to a significant increase in coil heat generation, resulting in excessive temperature rise that fails to meet practical application requirements.

[0004] Another common method is to reduce the reaction force value, thereby achieving rapid relay operation. However, this method also has significant drawbacks: reducing the reaction force value leads to a decrease in the contact disconnection speed, which in turn affects the relay's performance and reliability. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a magnetic circuit component and an electromagnetic relay. Through structural improvements, it can achieve rapid relay operation without reducing the reaction force value.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a magnetic circuit part for a relay, including a coil frame, a moving iron core and a magnetic circuit closing component. The moving iron core is movably disposed in the shaft hole of the coil frame along the axial direction of the coil frame. The magnetic circuit closing component is disposed on one side of the moving iron core in the direction of movement and is used to attract the moving iron core when the relay contacts are closed. It also includes a plurality of elastic elements for providing a reaction force when the relay contacts are open. The plurality of elastic elements are located between the moving iron core and the magnetic circuit closing component, and at least two elastic elements are compressed sequentially at different stages during the process of the moving iron core moving in the direction that closes the relay contacts.

[0007] In a preferred embodiment, the at least two elastic elements include at least one first elastic element and at least one second elastic element. The first elastic element is compressed in the initial stage of the movement of the moving iron core in the direction of closing the relay contacts, and both the first and second elastic elements are compressed in the subsequent stage of the movement of the moving iron core in the direction of closing the relay contacts.

[0008] In a preferred embodiment, the elastic force of the first elastic element is less than the elastic force of the second elastic element.

[0009] In a preferred embodiment, the plurality of elastic elements are springs, and the plurality of elastic elements are coaxially sleeved together, with a gap in the radial direction between adjacent elastic elements.

[0010] In a preferred embodiment, the moving iron core is provided with a push rod extending along its direction of movement, the magnetic circuit closing component is provided with a first clearance hole corresponding to the push rod, and the plurality of elastic elements are fitted around the push rod.

[0011] In a preferred embodiment, the magnetic circuit closing component is a stationary iron core disposed in the shaft hole of the coil frame, the stationary iron core being located on the side of the moving iron core opposite to the relay contacts.

[0012] In a preferred embodiment, the at least two elastic elements include at least one first elastic element and at least one second elastic element. The first elastic element abuts against the push rod and the stationary iron core, and the second elastic element is engaged between the push rod and / or the moving iron core and the stationary iron core. The second elastic element does not contact the push rod and the moving iron core before compression.

[0013] In a preferred embodiment, the push rod has a first stepped surface, the push rod and / or the moving iron core has a second stepped surface, and the stationary iron core has a third stepped surface. The first stepped surface, the second stepped surface and the third stepped surface are respectively arranged opposite to each other. The first elastic element abuts between the first stepped surface and the third stepped surface, and the second elastic element cooperates between the second stepped surface and the third stepped surface. The second elastic element does not contact the second stepped surface before compression.

[0014] In a preferred embodiment, the system further includes a yoke assembly comprising a yoke frame and a yoke plate, the yoke frame and the yoke plate forming a frame-like portion, the coil frame being disposed within the frame-like portion, the stationary iron core being connected to one of the yoke frame and the yoke plate, and the other of the yoke frame and the yoke plate having a second clearance hole corresponding to the moving iron core.

[0015] This utility model also provides an electromagnetic relay, including the magnetic circuit part as described above.

[0016] In a preferred embodiment, the system further includes a contact assembly comprising a plurality of stationary springs and at least one movable spring. The movable spring is disposed on a movable spring support, which is fixed together with the moving iron core, so that the movable spring support carries the movable spring and moves together with the moving iron core. Each stationary spring is fixedly disposed between the movable spring and the magnetic circuit portion. Each stationary spring is provided with a stationary contact, and the movable spring is provided with a movable contact, with the movable contact and the stationary contact corresponding to each other.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention also includes multiple elastic elements that provide a reaction force when the relay contacts open. These elastic elements are located between the moving iron core and the magnetic circuit closing component. During the movement of the moving iron core in the direction that closes the relay contacts, at least two elastic elements are sequentially compressed at different stages. This allows the elastic elements to provide a smaller reaction force when the distance between the moving iron core and the magnetic circuit closing component is large, promoting the movement of the moving iron core, ensuring rapid initial action, and shortening the action time. Conversely, as the distance between the moving iron core and the magnetic circuit closing component decreases, a larger reaction force is provided to ensure rapid contact opening. Therefore, this invention can achieve rapid relay action without reducing the reaction force value.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the magnetic circuit part and electromagnetic relay of the present invention are not limited to the embodiments. Attached Figure Description

[0020] Figure 1 This is an exploded view of the magnetic circuit part of this utility model (including the moving spring bracket);

[0021] Figure 2 This is a cross-sectional view of the magnetic circuit portion of this utility model;

[0022] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0023] Figure 4 This is a cross-sectional view of the push rod of this utility model;

[0024] Figure 5 This is a schematic diagram of the push rod of this utility model in its combined state with the first elastic element and the second elastic element.

[0025] Figure 6 This is an exploded view of the electromagnetic relay of this utility model;

[0026] Figure 7 This is a three-dimensional structural diagram of the electromagnetic relay of this utility model (excluding the top cover);

[0027] Figure 8 This is a cross-sectional view of the electromagnetic relay of this utility model;

[0028] Figure 9 This is a schematic diagram of the suction reaction force curve of this utility model;

[0029] In the diagram, 1. Coil frame; 2. Coil; 3. Moving iron core; 31. Limiting groove; 4. Stationary iron core; 41. First clearance hole; 42. Third step surface; 5. First elastic element; 6. Second elastic element; 7. Push rod; 71. First step surface; 72. Second step surface; 8. Yoke assembly; 81. Yoke frame; 82. Yoke plate; 9. Stationary spring; 91. Stationary contact; 92. Terminal block; 10. Moving spring; 101. Moving contact; 20. Moving spring bracket; 30. Contact spring; 40. Base; 50. Upper cover; 60. Lower cover. Detailed Implementation

[0030] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0031] Please see Figures 1-5 As shown, a magnetic circuit component of this invention, used in a relay, includes a coil frame 1 with a coil 2 wound around it, a moving iron core 3, and a magnetic circuit closing component. The moving iron core 3 is movably disposed in the shaft hole of the coil frame 1 along the axial direction of the coil frame 1. The magnetic circuit closing component is disposed on one side of the moving iron core 3 in the direction of movement and is used to attract the moving iron core 3 when the relay contacts are closed. This invention also includes multiple elastic elements for providing a reaction force when the relay contacts are opened. These multiple elastic elements are located between the moving iron core 3 and the magnetic circuit closing component, and at least two elastic elements are sequentially compressed at different stages during the movement of the moving iron core 3 in the direction that closes the relay contacts. In this way, when the distance between the moving iron core 3 and the magnetic circuit closing component is large, the elastic elements can provide a small reaction force to promote the movement of the moving iron core 3, ensuring rapid action in the initial state and thus shortening the contact closing time. As the distance between the moving iron core 3 and the magnetic circuit closing component decreases, a larger reaction force is provided to ensure the contact opening speed.

[0032] The aforementioned multiple elastic elements are preferably springs, but are not limited to this. In other embodiments, springs can also be replaced by leaf springs, rubber elastic elements, pneumatic / hydraulic elastic elements, shape memory alloys, or magnetic elastic elements, which are equivalent substitutions. The aforementioned multiple elastic elements are coaxially sleeved together, and there is a gap between adjacent elastic elements in the radial direction. In this way, the space occupied by multiple elastic elements in the axial direction can be reduced, and interference between adjacent elastic elements can be avoided.

[0033] The aforementioned at least two elastic elements include at least one first elastic element 5 and at least one second elastic element 6. The first elastic element 5 and the second elastic element 6 are compressed sequentially at different stages. Specifically, the first elastic element 5 is compressed in the initial stage when the moving iron core 3 moves in the direction that closes the relay contacts. Both the first elastic element 5 and the second elastic element 6 are compressed in subsequent stages of the movement of the moving iron core 3 in the direction that closes the relay contacts. The initial stage refers to the earliest time period during which the moving iron core 3 begins to move in the direction that closes the relay contacts. The subsequent stages refer to the process after the initial stage where the moving iron core 3 continues to move in the direction that closes the contacts until the action is completed.

[0034] In this embodiment, two elastic elements are used; therefore, the first elastic element 5 and the second elastic element 6 are both one, but this is not a limitation. The elastic force of the first elastic element 5 is less than that of the second elastic element 6, allowing the elastic elements to provide a smaller reaction force in the initial stage to promote the accelerated movement of the moving iron core 3. The diameter of the first elastic element 5 is smaller than that of the second elastic element 6; therefore, the first elastic element 5 is fitted inside the second elastic element 6.

[0035] The moving iron core 3 is provided with a push rod 7 extending along its direction of movement. A first clearance hole 41 is provided corresponding to the push rod 7 in the magnetic circuit closing component, and multiple elastic elements are fitted around the push rod 7. The magnetic circuit closing component is a stationary iron core 4 located in the shaft hole of the coil frame 1, on the side of the moving iron core 3 facing away from the relay contacts. In other embodiments, the magnetic circuit closing component is a yoke plate located on one side of the coil frame in the axial direction. Therefore, the magnetic circuit portion of this invention can be applied to high-voltage DC relays.

[0036] The first elastic element 5 abuts against the push rod 7 and the stationary iron core 4, and the second elastic element 6 abuts between the push rod 7 and / or the moving iron core 3 and the stationary iron core 4, and the second elastic element 6 does not contact the push rod 7 and the moving iron core 3 before compression. Specifically, the push rod 7 has a first stepped surface 71, the push rod 7 and / or the moving iron core 3 has a second stepped surface 72, and the stationary iron core 4 has a third stepped surface 42. The first stepped surface 71 and the second stepped surface 72 are respectively arranged opposite to the third stepped surface 42, and the distance between the first stepped surface 71 and the third stepped surface 42 is smaller than the distance between the second stepped surface 71 and the third stepped surface 42. The first elastic element 5 abuts against the first stepped surface 71 and the third stepped surface 42, and the second elastic element 6 abuts between the second stepped surface 72 and the third stepped surface 42, and the second elastic element 6 does not contact the second stepped surface 72 before compression. In this embodiment, the second stepped surface 72 is provided on the push rod 7, but it is not limited to this. In other embodiments, the second stepped surface 72 is provided on the moving iron core 3, or both the moving iron core 3 and the push rod 7 are provided with the second stepped surface. The side of the moving iron core 3 facing the stationary iron core 4 is provided with a limiting groove 31 corresponding to the push rod. One end of the push rod 7 is placed in the limiting groove 31, and the first elastic member 5 is used to keep the push rod 7 and the moving iron core 3 in a relatively stationary state. The other end of the push rod 7 is movably inserted through the first clearance hole 41 of the stationary iron core 4.

[0037] The magnetic circuit portion of this invention also includes a yoke assembly 8, which comprises a yoke frame 81 and a yoke plate 82. The yoke frame 81 and the yoke plate 82 together form a frame-like portion, in which the coil frame 1 is disposed. The stationary iron core 4 is connected to one of the yoke frame 81 and the yoke plate 82, and the other of the yoke frame 81 and the yoke plate 82 corresponding to the moving iron core 3 is provided with a second clearance hole 821. Specifically, the yoke frame 81 is U-shaped, the stationary iron core 4 is connected to the yoke frame 81, and the yoke plate 82 is provided with a second clearance hole corresponding to the moving iron core 3.

[0038] Because the distance between the moving iron core 3 and the magnetic circuit closing component (in this embodiment, the magnetic circuit closing component is the stationary iron core 4, but it is not limited to this) is at its maximum when the contacts are open, the large air gap leads to large magnetic leakage, and the electromagnetic attraction is relatively small at this time. Therefore, in the initial stage, the first elastic element 5 provides a small reaction force, which can promote the rapid movement of the moving iron core 3. When the air gap between the moving iron core 3 and the stationary iron core 4 becomes smaller, the electromagnetic attraction increases rapidly. At this time, the second elastic element 6 is compressed at the same time to increase the overall reaction force, thereby ensuring rapid action in the initial state, shortening the action time, improving electrical life, and ensuring the contact opening speed.

[0039] Please see Figures 1-9 As shown, an electromagnetic relay of the present invention includes the magnetic circuit part as described above.

[0040] This utility model also includes a contact assembly, which includes multiple stationary springs 9 and at least one movable spring 10. The movable spring 10 is mounted on a movable spring support 20, which is fixed to the moving iron core 3, so that the movable spring support 20 moves with the movable spring 10 along with the moving iron core 3. Each stationary spring 9 is fixedly disposed between the movable spring 10 and the magnetic circuit portion. Each stationary spring 9 is provided with a stationary contact 91, and each movable spring 10 is provided with a movable contact 101, with the movable contact 101 corresponding to and engaging with the stationary contact 91. Specifically, in this embodiment, the movable spring support 20 and the moving iron core 3 are fixed together by integral insert injection molding; a contact spring 30 is provided between the movable spring support 20 and the movable spring 10 to achieve contact overtravel. There are two stationary springs 9, and the movable spring 10 is a rigid spring with movable spring contacts at both ends, which correspond to and engage with the stationary contacts 91 on the two stationary springs 9, forming a bridge-type contact structure.

[0041] This utility model also includes a base 40, an upper cover 50, and a lower cover 60. Each stationary spring 9 is respectively disposed on the base 40, and the base 40 is provided with a terminal 92 for each stationary spring 9 to be electrically connected to the stationary spring. The yoke assembly 8 is disposed at the bottom of the base 40, and the moving iron core 3 passes downward through the second clearance hole 821 of the base 40 and the yoke plate 82 and enters the shaft hole of the coil frame 1. The lower cover 60 is disposed at the bottom of the base 40 and encloses the yoke assembly 8 therein. The upper cover 50 is disposed at the top of the base 40 and encloses the moving spring, the moving spring bracket 20, and the contact spring 30 therein.

[0042] This utility model discloses an electromagnetic relay, which is obtained through a combination of experimental measurement and simulation. Figure 9 The diagram shows the electromagnetic attraction curves, where the x-axis represents the displacement of the moving iron core 3, and the y-axis represents the magnitude of the force. Curve a is the electromagnetic attraction curve, reflecting the change in electromagnetic attraction experienced by the moving iron core 3 under different displacements. Line segment b is the resultant force curve of the contact spring 30, the first elastic element 5, and the second elastic element 6 during the contact closure phase, indicating the change in the force exerted by the contact spring 30, the first elastic element 5, and the second elastic element 6 during the contact closure process. Line segment c is the reaction force curve obtained by compressing the first elastic element 5 during the initial stage of the moving iron core 3's movement in the direction of contact closure. Line segment d is the reaction force curve obtained by compressing the first elastic element 5 and the second elastic element 6 during the subsequent stage of the moving iron core 3's movement in the direction of contact closure. Line segment e is the reaction force curve of a prior art electromagnetic relay when the moving iron moves in the direction of contact closure. (See attached diagram) Figure 9 It can also be seen that, under the same reaction force value, in the initial stage of the movement of the moving iron core 3, the reaction force value of this invention is less than that of the prior art. Therefore, the moving iron core 3 can move quickly, thereby accelerating the closing of the contact. Afterward, the reaction force value of this invention increases, which can ensure that the subsequent contact is quickly disconnected.

[0043] The magnetic circuit part and electromagnetic relay of this utility model are identical to or can be implemented using existing technology.

[0044] The above embodiments are only used to further illustrate a magnetic circuit part and an electromagnetic relay of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A magnetic circuit portion for a relay comprising a coil holder, a movable iron core which is movably disposed in an axial hole of the coil holder in an axial direction of the coil holder, and a magnetic circuit closing member which is provided on one side in a moving direction of the movable iron core and which is used to be attracted to the movable iron core in a contact-closed state of the relay, characterized in that: The multiple elastic members are arranged between the moving iron core and the magnetic circuit closing component, and at least two elastic members are compressed in sequence at different stages during the movement of the moving iron core in the direction of closing the contacts of the relay. ​ 2. The magnetic circuit portion according to claim 1, characterized in that: The at least two elastic members include at least one first elastic member and at least one second elastic member, the first elastic member being compressed at an initial stage of the movement of the moving iron core in the direction of closing the contacts of the relay, and the first elastic member and the second elastic member being compressed at a subsequent stage of the movement of the moving iron core in the direction of closing the contacts of the relay.

3. The magnetic circuit portion according to claim 2, characterized in that: The elastic force of the first elastic member is smaller than the elastic force of the second elastic member.

4. The magnetic circuit portion of claim 1, wherein: The multiple elastic members are springs, and the multiple elastic members are coaxially sleeved together, and gaps are arranged between adjacent elastic members in the radial direction.

5. The magnetic circuit portion according to any one of claims 1 to 4, characterized by: The moving iron core is provided with a push rod extending in the movement direction thereof, the magnetic circuit closing component is provided with a first clearance hole corresponding to the push rod, and the multiple elastic members are sleeved outside the push rod.

6. The magnetic circuit portion according to claim 5, characterized in that: The magnetic circuit closing component is a static iron core arranged in the shaft hole of the coil holder, and the static iron core is located on the side of the moving iron core opposite to the contacts of the relay.

7. The magnetic circuit portion according to claim 6, characterized in that: The at least two elastic members include at least one first elastic member and at least one second elastic member, the first elastic member being abutted and fitted between the push rod and the static iron core, and the second elastic member being fitted between the push rod and / or the moving iron core and the static iron core, and the second elastic member not being in contact with the push rod and the moving iron core before being compressed.

8. The magnetic circuit portion according to claim 7, characterized in that: The push rod is provided with a first step surface, the push rod and / or the moving iron core is provided with a second step surface, and the static iron core is provided with a third step surface, the first step surface and the second step surface being oppositely arranged with the third step surface, the first elastic member being abutted between the first step surface and the third step surface, and the second elastic member being fitted between the second step surface and the third step surface, and the second elastic member not being in contact with the second step surface before being compressed.

9. The magnetic circuit portion of claim 6, wherein: The yoke assembly includes a yoke frame and a yoke plate, the yoke frame and the yoke plate enclosing a frame-shaped portion, the coil holder being arranged in the frame-shaped portion, one of the yoke frame and the yoke plate being connected to the static iron core, and the other of the yoke frame and the yoke plate being provided with a second clearance hole corresponding to the moving iron core.

10. An electromagnetic relay characterized by comprising: The magnetic circuit portion includes the magnetic circuit portion according to any one of claims 1-9.

11. The electromagnetic relay according to claim 10, characterized in that: The contact assembly includes multiple static spring sheets and at least one moving spring sheet, the moving spring sheet being arranged on a moving spring support, the moving spring support being fixed with the moving iron core so that the moving spring support moves together with the moving iron core and the moving spring sheet, and each static spring sheet being fixedly arranged between the moving spring sheet and the magnetic circuit portion; each static spring sheet being provided with a static contact, and the moving spring sheet being provided with a moving contact corresponding to the static contact.

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