An electromagnetic relay housing and an impact-resistant electromagnetic relay

Abstract

This utility model relates to the field of electromagnetic relay technology, specifically disclosing a housing for an electromagnetic relay and an impact-resistant electromagnetic relay. The housing includes a housing body with an internal assembly cavity with a bottom opening. The housing body encloses the magnetic circuit portion and contact portion of the electromagnetic relay base through the assembly cavity. Inside the assembly cavity of the housing body, corresponding to the position of the first end of the armature of the assembled electromagnetic relay, there is a first limiting protrusion that constrains and limits the lateral movement and / or outward turning of the armature under impact. The first limiting protrusion engages with the armature in normal operation with a clearance fit that allows movement. The first end of the armature is the end furthest from the contact portion. This utility model effectively prevents the armature from shifting beyond its normal operating position due to impact, giving the finished electromagnetic relay excellent impact resistance.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic relay technology, specifically to a housing for an electromagnetic relay and an impact-resistant electromagnetic relay including the housing. Background Technology

[0002] A common push-rod type electromagnetic relay mainly consists of a base, a magnetic circuit section and a contact section mounted on the base and connected by a push-lock mechanism, and a housing enclosing the magnetic circuit section and the contact section on the base. The magnetic circuit section mainly comprises an iron core housed within the coil frame in the base, a coil mounted on the coil frame, a yoke positioned beside the coil, an approximately L-shaped armature with a flip-up structure mounted on the yoke blade edge, and a compression spring that applies spring force to the back of the armature, supported by the coil frame. The contact section mainly consists of a moving spring assembly and a stationary spring assembly mounted on the base. The working principle of this type of push-rod electromagnetic relay is roughly as follows: When current is applied to both ends of the coil leads, the excitation current of the coil will generate magnetic flux. The magnetic flux forms a magnetic circuit through the working air gap between the iron core, yoke and armature, and generates electromagnetic attraction in the working air gap. When the excitation current rises to a certain design value, the electromagnetic attraction torque will overcome the elastic reaction torque of the moving spring in the contact part, causing the armature with an approximately L-shaped structure to rotate on the yoke, thereby driving the pusher to push the moving spring in the contact part, realizing the closure of the moving and stationary contacts in the contact part. When the excitation current decreases to a certain design value, the elastic reaction torque of the moving spring in the contact part is greater than the electromagnetic attraction torque, and the armature with an approximately L-shaped structure rotates on the yoke to return to its initial state, and the moving contact and the stationary contact in the contact part disconnect.

[0003] As can be seen from the molding structure and working principle of the aforementioned push-rod type electromagnetic relay, the approximately L-shaped armature is constrained to the coil frame by a spring with a flip-out structure and supported by the blade edge of the yoke. During operation, it needs to reciprocate and flip with the blade edge of the yoke as support. Sufficient space is reserved between the top side wall of the housing and the top of the magnetic circuit section for the armature's flipping motion. However, during long-term product development, the applicant discovered that due to the relatively heavy weight of the armature, when the finished electromagnetic relay is subjected to a large impact such as a drop, the heavier armature will break through the assembly pressure of the spring and shift towards the top side wall of the housing. A large positional shift will either cause the spring assembly to fail or cause the armature to get stuck between the housing and the push-out clip. Ultimately, this manifests as the mechanical structure of the electromagnetic relay being damaged and failing, thus preventing it from working properly. Utility Model Content

[0004] The technical objective of this utility model is to provide, in view of the special characteristics of the aforementioned push-rod type electromagnetic relay and the shortcomings of the prior art, an electromagnetic relay housing that can effectively constrain and limit the armature of the assembled electromagnetic relay when it is subjected to impact, and prevent the armature from exceeding the assembly pressure of the compression spring and causing a large positional displacement, while ensuring the normal operation of the push-rod type electromagnetic relay, and an impact-resistant electromagnetic relay containing the housing.

[0005] The technical objective of this utility model is achieved through the following technical solution: a housing for an electromagnetic relay, comprising a housing body, wherein the housing body has an assembly cavity with a bottom opening inside, and the housing body encloses the magnetic circuit portion and contact portion on the electromagnetic relay base through the assembly cavity. Inside the assembly cavity of the outer shell body, at the position corresponding to the first end of the armature of the assembled electromagnetic relay, there is a first limiting protrusion that constrains and limits the lateral movement and / or outward turning action of the armature under impact. The first limiting protrusion is engaged with the normal operating state with a clearance fit that allows for movement; The first end of the armature is the end furthest from the contact portion.

[0006] The aforementioned technical measures address the unique characteristics of the push-rod type electromagnetic relay and the L-shaped armature's gravity-induced flipping action upon impact. A corresponding first limiting protrusion is provided within the suitable housing. When the housing is assembled onto the base of the push-rod type electromagnetic relay, the first limiting protrusion is located at the end of the armature furthest from the contact portion, with sufficient space for normal operation between it and the corresponding end of the armature. If the finished electromagnetic relay is subjected to impact such as a drop, the first limiting protrusion effectively constrains and limits the positional deviation of the corresponding end of the armature that exceeds normal operation, preventing the armature from exceeding the spring assembly pressure and causing a large positional deviation. This gives the finished electromagnetic relay impact resistance, ensuring that the armature of the finished electromagnetic relay can stably maintain a tight mechanical structure after impact, thereby guaranteeing normal operation.

[0007] In other words, the above-mentioned technical measures, under the premise of ensuring the normal operation of the push rod electromagnetic relay, can effectively constrain and limit the armature of the assembled electromagnetic relay when it is subjected to impact, prevent the armature from exceeding the assembly pressure of the compression spring and causing a large positional displacement, which is conducive to ensuring that the finished electromagnetic relay can stably maintain the tight fit of the mechanical structure after being subjected to impact, ensuring normal operation and good impact resistance.

[0008] As one of the preferred technical solutions, the first limiting protrusion in the assembly cavity of the outer shell body constrains and limits the lateral movement and outward turning of the armature under impact. The area of ​​the first limiting protrusion that cooperates with the first end of the armature has a lateral movement stop surface and an outward turning stop surface that are in L-shaped structure.

[0009] Alternatively, as an alternative to the above-mentioned L-shaped stop surface first limiting protrusion technical solution, the first limiting protrusion in the assembly cavity of the outer shell body constrains and limits the lateral movement and outward turning of the armature under impact. The area of ​​the first limiting protrusion cooperating with the first end of the armature is a limiting stop surface with a sloping structure. The limiting stop surface of the inclined structure is engaged with the surface of the armature that is opposite to the iron core at an acute angle.

[0010] The above-mentioned technical measures target the function of the first limiting protrusion inside the housing. When the housing is assembled in place (i.e., assembled on the base of the electromagnetic relay, the same below), the first limiting protrusion forms a two-way constraint limit in the lateral and outward directions at the end of the armature away from the contact part. It has a good constraint effect on the positional deviation of the armature. This is especially prominent for the first limiting protrusion with the L-shaped structure of the lateral and outward stop surfaces. That is, it can effectively constrain and limit the lateral and outward positional deviations of the corresponding ends of the armature that exceed the normal operation, preventing the armature from exceeding the assembly pressure of the compression spring and causing a large positional deviation. It can effectively ensure that the armature of the finished electromagnetic relay maintains a stable and tight mechanical structure after being impacted, thereby reliably ensuring normal operation.

[0011] As one of the preferred technical solutions, the assembly cavity of the outer shell body has a second limiting protrusion at the position corresponding to the bent part of the armature of the assembled electromagnetic relay, which constrains and limits the lateral movement and / or outward turning action of the armature under impact. The second limiting protrusion engages with the normal operating state with a clearance fit that allows for movement.

[0012] The aforementioned technical measures address the unique characteristics of the L-shaped armature structure in the aforementioned push-rod electromagnetic relay. In addition to the first limiting protrusion within the suitable housing, a second limiting protrusion corresponding to the bent portion of the armature is also provided. When the housing is assembled, the second limiting protrusion is positioned at the bent portion of the armature, with sufficient space between it and the bent portion for normal operation. This, in conjunction with the first limiting protrusion corresponding to the end of the armature furthest from the contact portion, effectively constrains and limits the positional deviation of the armature beyond normal operation caused by a drop or other impact when the finished electromagnetic relay is subjected to such an event. This prevents the armature from exceeding the assembly pressure of the compression spring and causing a large positional deviation, thus ensuring the finished electromagnetic relay has reliable impact resistance and guaranteeing that the armature maintains a stable and tight mechanical structure after an impact.

[0013] Furthermore, the second limiting protrusion within the outer shell body consists of two sets arranged at intervals along the width direction of the armature; In the mating structure with the armature, the two sets of second limiting protrusions are arranged in a triangular point mating relationship with the first limiting protrusion inside the outer shell.

[0014] The second limiting protrusion of the above-mentioned technical measures is arranged in a triangular point relationship with the first limiting protrusion in the outer shell. So when it is used with the assembled electromagnetic relay, the two sets of second limiting protrusions and one set of first limiting protrusions constrain and limit the armature at the triangular point. This allows the armature, which is constrained and limited by impact, to be able to bear the force relatively smoothly and will not warp during impact, thus having good stability.

[0015] Furthermore, the second limiting protrusion within the assembly cavity of the outer shell body constrains and limits the lateral movement and outward flipping action of the armature under impact. The second limiting protrusion, in conjunction with the area of ​​the armature's bent portion, has an arc-shaped stop surface with a concave curved surface structure. The arc trajectory of the arc-shaped stop surface corresponds to the arc trajectory of the armature's bent portion. This technical measure's second limiting protrusion effectively fits the structure of the armature's bent portion, is easy to design and form, and, while fulfilling the constraint and limiting function, will not interfere with the normal flipping action of the armature.

[0016] Furthermore, the assembly cavity of the outer shell body also has a cavity partition wall, which divides the assembly cavity into a magnetic circuit cavity and a contact cavity. The second limiting protrusion is formed between the cavity baffle and the top side wall of the outer shell body.

[0017] The above-mentioned technical measures not only separate the assembly cavity inside the shell, so that the magnetic circuit part and the contact part are assembled relatively independently in the assembly cavity, which is beneficial to improving the impact resistance, but also make the molding structure of the second limiting protrusion maintain good stability.

[0018] As one of the preferred technical solutions, within the assembly cavity of the housing body, at the position corresponding to the assembled electromagnetic relay spring, there is a third limiting protrusion that constrains and limits the spring assembly structure. This technical measure ensures that the assembled housing constrains and limits the spring assembling the armature. If the finished electromagnetic relay is subjected to impact such as a drop, the third limiting protrusion of the housing stops and constrains the spring assembling the armature at the coil frame and yoke blade edge. The force exerted on the spring by the armature due to gravity is limited, ensuring the stability of the spring assembly on the coil frame, and thus ensuring the stable maintenance of the armature assembly pressure. This further effectively guarantees that the armature of the finished electromagnetic relay can stably maintain a tight mechanical structure after an impact, giving the finished electromagnetic relay reliable impact resistance.

[0019] Furthermore, the third limiting protrusion inside the outer casing is in two sets, respectively located on both sides of the compression spring of the assembled electromagnetic relay in the width direction, corresponding to the compression spring insertion part on the corresponding side.

[0020] Furthermore, the compression spring has a notch at the insertion position on both sides in the lateral direction for the corresponding third limiting protrusion to pass through. When the outer casing is assembled into place on the base of the electromagnetic relay, the third limiting protrusion passes through the corresponding spring clearance notch on the spring and constrains and limits the corresponding insertion part of the spring.

[0021] The aforementioned technical measures ensure that the third limiting protrusion of the housing constrains and limits the compression spring at the insertion point of the compression spring. The force between the third limiting protrusion and the compression spring is clear (i.e., a constraint force is formed between the third limiting protrusion and the corresponding insertion point of the compression spring along the insertion direction), which can reliably ensure that the compression spring is stably inserted on the coil frame. When the finished electromagnetic relay is dropped or subjected to impact, the stopping force of the third limiting protrusion will not cause impact deformation to the compression spring. This is especially prominent in the cooperation structure between the third limiting protrusion and the compression spring through the compression spring clearance notch, which can effectively ensure that the compression spring and armature of the finished electromagnetic relay maintain a stable and tight mechanical structure after being impacted.

[0022] An impact-resistant electromagnetic relay includes a base, a magnetic circuit portion mounted on the base, a contact portion mounted on the base, a pusher between the armature of the magnetic circuit portion and the moving spring assembly of the contact portion, and a housing; The outer shell, in conjunction with the base, encloses the magnetic circuit portion, contact portion, and push card on the base; The outer shell is any of the structures described above.

[0023] The aforementioned push-rod type electromagnetic relay uses a housing with the aforementioned structure. The first limiting protrusion arranged inside the housing, and the combination of the first limiting protrusion with the second limiting protrusion and / or the third limiting protrusion, constrain and limit the armature (armature assembly structure). It has the technical advantages of the aforementioned housing structure, namely, under the premise of satisfying the normal operation of the push-rod type electromagnetic relay, it can effectively constrain and limit the armature when it is impacted, preventing the armature from exceeding the assembly pressure of the compression spring and causing a large positional displacement. This helps to ensure that the finished electromagnetic relay can stably maintain the tight fit of the mechanical structure after being impacted, ensuring normal operation and good impact resistance.

[0024] Furthermore, the first end of the armature, which serves to engage with the first limiting protrusion within the outer casing, has a thickened, flat surface facing away from the iron core. This technical measure, while satisfying the functional characteristics of the armature itself, thickens the end of the armature furthest from the contact portion—the first end—which experiences greater inertia during impact. This reduces the weight of the armature, thereby decreasing the inertial force generated by it under impact. Secondly, this thickening design is formed with a flat surface structure to engage with the first limiting protrusion. Thus, when the first end of the armature contacts and engages with the first limiting protrusion within the outer casing, it presents a surface-to-surface contact relationship, resulting in a more balanced and dispersed contact force, and better long-term effectiveness and stability.

[0025] The beneficial technical effects of this utility model are as follows: The above-mentioned technical measures, in view of the special characteristics of the push rod type electromagnetic relay, optimize the internal structure of the housing, so that the assembled housing, while meeting the normal operation of the push rod type electromagnetic relay, can constrain and limit the armature (compression spring assembly structure) of the finished electromagnetic relay that has been subjected to impacts such as drops, so as to prevent the armature from being displaced beyond the normal operation due to impact (breaking the compression spring assembly pressure), thereby giving the finished electromagnetic relay good impact resistance, ensuring that the finished electromagnetic relay can stably maintain the tight fit of the mechanical structure after being impacted, and ensuring normal operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the outer shell of this utility model.

[0027] Figure 2 for Figure 1 The image shows a three-dimensional view of the outer casing from a downward angle.

[0028] Figure 3This is a schematic diagram of the structure of the electromagnetic relay of this utility model.

[0029] Figure 4 for Figure 3 AA view.

[0030] Figure 5 for Figure 3 The image shows a 3D view of the electromagnetic relay after the casing has been removed.

[0031] The symbols in the diagram have the following meanings: 1—Outer shell body; 11—Assembly cavity; 111—Magnetic circuit cavity; 112—Contact cavity; 12—First limiting protrusion; 121—Transverse sliding stop; 122—Outward turning stop; 13—Second limiting protrusion; 131—Arc-shaped stop; 14—Third limiting protrusion; 15—Cavity partition wall; 2—Base; 3—Coil; 4—Yoke; 5—Armature; 51—Thickened flat surface; 6—Compression spring; 61—Compression spring clearance notch; 7—Pushing clip; 8—Moving spring assembly; 9—Stabilizing spring assembly. Detailed Implementation

[0032] This utility model relates to the field of electromagnetic relay technology, specifically a housing for an electromagnetic relay, and an impact-resistant electromagnetic relay including the housing. The main technical solution of this utility model 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 and Figure 5 The technical solution of this utility model is clearly and thoroughly explained; although other embodiments are not shown in separate drawings, their main structures can still be referred to the drawings of Embodiment 1.

[0033] It should be noted that the accompanying drawings of this utility model are schematic, and unnecessary details have been simplified to clarify the technical purpose of this utility model, so as to avoid obscuring the technical solution contributed by this utility model to the prior art. In addition, the expressions such as "about" and "basically" regarding quantity or fit relationship in the following text mean that reasonable assembly errors and processing errors are allowed in the industry, and do not literally describe absolute quantity or fit relationship.

[0034] Example 1 See Figure 3 , Figure 4 and Figure 5As shown, the push rod type electromagnetic relay of this utility model mainly consists of a base 2 and a magnetic circuit part (including coil frame, coil 3, iron core, yoke 4, armature 5, compression spring 6, etc.) assembled on the base 2, a contact part (including moving spring assembly 8 and stationary spring assembly 9, wherein the moving spring assembly 8 has a moving spring and a moving contact, and the stationary spring assembly 9 has a stationary spring and a stationary contact), a push card 7 located between the armature 5 in the magnetic circuit part and the moving spring in the contact part, and a shell that cooperates with the base 2 to enclose the magnetic circuit part, the contact part, and the push card 7.

[0035] In the aforementioned electromagnetic relay structure, the armature 5 is approximately an L-shaped bent structure, having a first end, a second end, and a middle bent portion. The first end of the armature 5 is the end furthest from the contact portion, extending above the iron core and close to the top side wall of the outer casing. The second end of the armature 5 is the end close to the contact portion, extending to the lower part of the yoke and serving as a connecting push clip 7. The bent portion of the armature 5 is located at the knife edge of the yoke 4. With the base 2 as a horizontal reference, the bent portion of the armature 5 corresponds laterally to the first end and vertically to the second end. The compression spring 6 is located in the width direction (corresponding to...). Figure 2 The inserts on both sides (shown in the front-back direction) are offset from the yoke 4 in the transverse direction and inserted into the coil frame on both sides of the yoke. The elastic spring between the inserts on both sides of the compression spring 6 extends to the bent part of the armature 5 and cooperates with the knife edge of the yoke 4 to press and assemble the armature 5.

[0036] In the initial state, the spring force of the moving spring in the contact part of the electromagnetic relay with the above structure is basically in a free state, the moving contact and the stationary contact are disconnected and the designed clearance is maintained. The moving spring applies an elastic reaction torque to the armature 5 of the magnetic circuit by pushing the card 7, and the armature 5 is disconnected from the iron core and the designed clearance is maintained. When the excitation current of the magnetic circuit section rises to the design value, the electromagnetic attraction torque will overcome the elastic reaction torque of the moving spring in the contact section, causing the armature 5 to rotate and the armature 5 to be attracted to the iron core as designed, thereby driving the pusher 7 to push the moving spring in the contact section to achieve the closure of the moving contact and the stationary contact in the contact section. When the excitation current decreases to the design value, the elastic reaction torque of the moving spring in the contact part is greater than the electromagnetic attraction torque, the elastic force of the moving spring is released and reset, and the armature 5 in the magnetic circuit part returns to the initial state.

[0037] Therefore, it can be seen that the armature 5, in cooperation with the yoke 4 and the compression spring 6, needs to reciprocate at the blade edge of the yoke 4. Due to the relatively heavy weight of the armature 5, when the entire electromagnetic relay is subjected to impacts such as drops, especially drops, the armature 5 is prone to displacement beyond its normal operating range, particularly at its first end. This can lead to the failure of the compression spring 6 in assembling the armature 5 and / or the armature 5 being pushed and blocked by the clip 7 and the outer casing. To solve this technical problem, this utility model provides the following targeted outer casing structure, and necessary designs for other structures of the electromagnetic relay in conjunction with this outer casing structure.

[0038] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the outer shell of this utility model includes an outer shell body 1, which is a cuboid and hollow structure, having a top side wall panel, a left side wall panel, a right side wall panel, a front side wall panel and a rear side wall panel that form a cavity. The bottom side is open to allow the magnetic circuit part and contact part on the base 2 to be installed. That is, the interior of the outer shell body 1 has an assembly cavity 11 with a bottom opening. The outer shell body 1 encloses the magnetic circuit part and contact part on the base 2 through the assembly cavity 11.

[0039] To separate the assembly cavity 11 of the outer shell body 1 and allow the magnetic circuit portion and contact portion on the base 2 to be assembled relatively independently within the assembly cavity 11, a cavity-dividing baffle 15 protruding downward from the top side wall is provided within the assembly cavity 11 of the outer shell body 1. This cavity-dividing baffle 15 divides the aforementioned assembly cavity 11 into a magnetic circuit portion cavity 111 and a contact portion cavity 112. When the outer shell is assembled into place on the base 2, the magnetic circuit portion on the base 2 is located within the magnetic circuit portion cavity 111, and the contact portion on the base 2 is located within the contact portion cavity 112. The push clip 7 connecting the magnetic circuit portion and the contact portion is located below the cavity-dividing baffle 15 and is fitted with the cavity-dividing baffle 15 with a clearance that does not obstruct the pushing action.

[0040] To constrain and limit the armature 5 under impact, a first limiting protrusion 12 is formed within the assembly cavity 11 of the outer shell body 1, specifically within the magnetic circuit cavity 111, at the position corresponding to the first end of the armature 5. Specifically, this protrusion extends from the top side panel and the right side panel of the outer shell body 1 (within...). Figure 1 or Figure 2 The first limiting protrusion 12 is formed between the armature 5 and the reference orientation shown. The thickness direction of the first limiting protrusion 12 corresponds to the width direction of the armature 5, and is basically located in the central region of the armature 5 in the width direction. The first limiting protrusion 12 is used as a constraint and limit for the lateral movement and outward turning of the armature 5 under impact (the aforementioned lateral movement is... Figure 3 / Figure 1The left-right directional movement shown is used to constrain and limit the displacement of the armature from left to right; the aforementioned outward turning movement is... Figure 3 / Figure 1 The up-and-down movement shown is to constrain and limit the displacement movement of the armature from the bottom to the top. Therefore, in the area where the first limiting protrusion 12 engages with the first end of the armature 5, there is a transverse stop surface 121 and an outward-turning stop surface 122 in an L-shaped structure. The transverse stop surface 121 is located at the outer edge of the first end of the armature 5, and the outward-turning stop surface 122 is located on the outer surface of the armature 5 (the surface opposite to the iron core). This makes the area where the first limiting protrusion 12 engages with the first end of the armature 5 an L-shaped notch structure (or a rectangular notch structure). Of course, the L-shaped notch structure of the first limiting protrusion 12 and the armature 5 should not have too large or too small a gap. If it is too small, it will hinder the normal flipping action of the armature 5. If it is too large, it will not play the constraint and limiting role required by the design. Therefore, the L-shaped notch structure of the first limiting protrusion 12 is designed to be as close as possible to the armature 5 without hindering the normal action of the armature 5. This makes the first limiting protrusion 12 fit with the connection 5 in the normal operating state with a gap that allows for movement. When the electromagnetic relay is subjected to impacts such as drops, the armature 5 in the impacted state is constrained and limited in the lateral and outward flipping directions to prevent it from exceeding the normal operation position deviation, that is, to prevent the armature 5 from breaking through the assembly pressure of the compression spring 6 and causing a large position deviation.

[0041] Based on the aforementioned first limiting protrusion 12, to further enhance the constraint and limitation on the positional deviation of the armature 5 from exceeding normal operation, a second limiting protrusion 13 is formed in a raised structure within the assembly cavity 11 of the outer shell body 1, specifically within the magnetic circuit cavity 111, at the position corresponding to the bent portion of the armature 5. Specifically, it protrudes from between the top side wall plate of the outer shell body 1 and the cavity partition wall 15. The thickness direction of this second limiting protrusion 13 corresponds to the width direction of the armature 5, and it is basically located near the center of the armature 5 in the width direction. Of course, it should be offset from the position of the elastic spring 6 used for assembling the armature 5, and should not obstruct the assembly structure of the armature 5 by the spring 6. The second limiting protrusions 13 within the magnetic circuit cavity 111 are in two sets, arranged in a spaced pattern along the width of the armature 5. Preferably, these two sets of second limiting protrusions 13 are symmetrically positioned on both sides with the first limiting protrusion 12 on one side as the center. The two sets of second limiting protrusions 13 are also positioned on both sides of the elastic spring of the compression spring 6, forming a movable gap fit. This offsets the elastic spring of the compression spring 6 and facilitates balanced blocking during the constraint and limiting process. This also allows the second limiting protrusions 13 and the first limiting protrusion 12 to be arranged in a triangular point fit relationship within the outer casing 1. When used with the assembled electromagnetic relay, the two sets of second limiting protrusions 13, together with one set of first limiting protrusions 12, constrain and limit the armature 5 at the triangular point to ensure the stability of the impacted armature 5. The second limiting protrusions 13 are used to constrain and limit the lateral and outward movements of the armature 5 under impact (the aforementioned lateral movement is...). Figure 3 / Figure 1 The left-right directional movement shown is to constrain and limit the displacement of the armature from right to left; the aforementioned outward turning movement is... Figure 3 / Figure 1The up-and-down movement shown is to constrain and limit the displacement movement of the armature from the bottom to the top. Therefore, in the area where the second limiting protrusion 13 cooperates with the bent part of the armature 5, there is a horizontal stop structure and an outer stop structure. Since the outer surface of the bent part of the armature 5 has an arc-shaped bending trajectory, and the first end and the second end of the armature 5 are usually in an obtuse angle fit, it is not suitable to use the L-shaped fit of the first limiting protrusion 12, such as the horizontal moving stop surface 121 and the outward turning stop surface 122. Therefore, in the area where the second limiting protrusion 13 cooperates with the bent part of the armature 5, there is an arc-shaped stop surface 131 with an inward concave curved surface structure. The arc trajectory of the arc-shaped stop surface 131 corresponds to the arc trajectory of the bent part of the armature 5. Of course, just as the L-shaped notch structure of the first limiting protrusion 12 and the armature 5 are related, the gap between the arc-shaped stop surface 131 of the second limiting protrusion 13 and the armature 5 should not be too large or too small. If it is too small, it will hinder the normal flipping action of the armature 5. If it is too large, it will not play the constraint and limiting role required by the design. Therefore, the arc-shaped stop surface 131 of the second limiting protrusion 13 is designed to be as close as possible to the armature 5 without hindering the normal action of the armature 5. This makes the second limiting protrusion 13 fit with the connection 5 in the normal operating state with a design clearance that allows movement. When the electromagnetic relay is subjected to impacts such as drops, the armature 5 in the impacted state is constrained and limited in the lateral and outward directions to prevent it from exceeding the normal operation position deviation, that is, to prevent the armature 5 from breaking through the assembly pressure of the compression spring 6 and causing a large position deviation.

[0042] As described above, the first limiting protrusion 12 and the second limiting protrusion 13 within the outer shell 1 form a triangular arrangement that works together to constrain and limit the lateral movement of the armature 5 at its left and right ends. Figure 3 / Figure 1 The armature 5 is constrained and limited in the left and right directions as shown; furthermore, at both ends of the armature 5 in the outward turning direction, the armature 5 is constrained and limited in the outward turning direction, as shown in the diagram. Figure 3 / Figure 1 The armature's movement from bottom to top is constrained and limited, and the triangular arrangement of the two sets of second limiting protrusions 13 and one set of first limiting protrusions 12 can keep the impacted armature 5 stable and prevent it from tilting, thereby ensuring that the impacted armature 5 can reliably maintain stability.

[0043] In order to constrain and limit the assembly structure of the armature 5 on the knife edge of the yoke 4, in the assembly cavity 11 of the outer shell body 1, or more precisely, in the magnetic circuit cavity 111, at the insertion positions on both sides of the compression spring 6 in the width direction, there are two sets of independent third limiting protrusions 14 that constrain and limit the insertion structure of the compression spring 6 on the coil frame. Each set of third limiting protrusions 14 is formed by protruding between the top side wall plate of the outer shell body 1 and the corresponding front side wall plate / rear side wall plate. Two sets of third limiting protrusions 14 are respectively placed at the insertion positions of the compression spring 6 on both sides of the width direction, corresponding to the compression spring insertion part on the corresponding side; correspondingly, the compression spring 6 has compression spring clearance notches 61 on both sides of the insertion part in the width direction for the corresponding third limiting protrusions 14 to pass through. When the outer shell body 1 is assembled on the base 2, the third limiting protrusions 14 pass through the corresponding compression spring clearance notches 61 on the compression spring 6 to constrain and limit the corresponding insertion part of the compression spring 6, usually by abutment or micro-clear gap fit.

[0044] Based on the aforementioned shell structure, in order to reduce the inertial force of armature 5 when it is subjected to impact, the armature 5 can be designed to be thinner and lighter while satisfying the functional characteristics of the armature itself.

[0045] like Figure 3 , Figure 4 and Figure 5 As shown, in this invention, the armature 5 is used at the first end of the first limiting protrusion 12 inside the housing, and is located away from the surface of the iron core—that is, the outward-facing surface. A planar structure is used for thickness reduction design, forming a thickened flat surface 51 at the outward-facing surface of the first end of the armature 5. This thickened flat surface 51 reduces the thickness of the first end of the armature 5, which is far from the contact portion and has a large inertia during impact. Without hindering the functional characteristics of the armature 5 itself, this design helps to reduce the weight of the armature 5, thereby reducing the inertial force generated by the armature under impact. Simultaneously, this thickened flat surface 51 serves as the outward-facing stop surface 121 of the first limiting protrusion 12 inside the housing. That is, when the first end of the armature 5 contacts the first limiting protrusion 12 inside the housing, the thickened flat surface 51 of the armature 5 is essentially in surface contact with the outward-facing stop surface 121 of the first limiting protrusion 12, resulting in a more balanced and dispersed contact force.

[0046] Example 2 The rest of the content of this embodiment is the same as that of embodiment 1, except that: The first limiting protrusion in the assembly cavity of the outer shell body is used as the area that mates with the first end of the armature. It is a limiting stop with a sloping structure. The limiting stop with the sloping structure mates with the surface of the armature away from the iron core at an acute angle, thereby constraining and limiting the lateral movement and outward turning of the armature under impact.

[0047] Example 3 The rest of the content of this embodiment is the same as that of embodiment 1, except that: The first limiting protrusion inside the assembly cavity of the outer shell body, which serves as the area for mating with the first end of the armature, is a transverse planar structure, that is, it only has an outward-turning stop surface and no transverse-moving stop surface.

[0048] Although this embodiment can constrain and limit the outward flipping motion of the armature under impact, its effect is not as good as that of Embodiment 1.

[0049] Example 4 The rest of the content of this embodiment is the same as that of embodiment 1, except that: Remove the second limiting protrusion inside the assembly cavity of the outer shell body.

[0050] Although this embodiment can constrain and limit the positional displacement of the armature under impact, its effect is not as good as that of Embodiment 1.

[0051] Example 5 The rest of the content of this embodiment is the same as that of embodiment 1, except that: Remove the third limiting protrusion inside the assembly cavity of the outer shell body.

[0052] Although this embodiment can constrain and limit the positional displacement of the armature under impact, its effect is not as good as that of Embodiment 1.

[0053] Example 6 The rest of the content of this embodiment is the same as that of embodiment 1, except that: The compression spring clearance notch structure on the compression spring is removed, and the third limiting protrusion in the assembly cavity of the outer shell body constrains and limits the top of the insertion part on the corresponding side of the compression spring.

[0054] Although this embodiment can constrain and limit the assembly structure of the compression spring, and thus constrain and limit the positional displacement of the armature under impact, the top of the insertion part of the compression spring is prone to deformation under the influence of the third limiting protrusion during impact, resulting in unsatisfactory performance.

[0055] The above embodiments are only used to illustrate the present invention and are not intended to limit it.

[0056] 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 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. A housing for an electromagnetic relay, comprising a housing body (1), wherein the housing body (1) has an assembly cavity (11) with a bottom opening inside, and the housing body (1) encloses the magnetic circuit portion and contact portion on the electromagnetic relay base (2) through the assembly cavity (11); Its features are: Inside the assembly cavity (11) of the outer shell body (1), at the position corresponding to the first end of the armature of the assembled electromagnetic relay, there is a first limiting protrusion (12) that constrains and limits the lateral movement and / or outward turning action of the armature (5) under impact. The first limiting protrusion (12) and the armature (5) in normal operation are fitted with a clearance that allows movement; The first end of the armature is the end furthest from the contact portion.

2. The housing for the electromagnetic relay according to claim 1, characterized in that: The first limiting protrusion (12) in the assembly cavity (11) of the outer shell body (1) constrains and limits the lateral movement and outward turning of the armature (5) under impact. The first limiting protrusion (12) has a lateral moving stop surface (121) and an outward turning stop surface (122) in L-shaped structure in the area of ​​the first end of the armature. Alternatively, the first limiting protrusion (12) in the assembly cavity (11) of the outer shell body (1) constrains and limits the lateral movement and outward turning of the armature (5) under impact. The area of ​​the first limiting protrusion (12) that cooperates with the first end of the armature is a limiting stop surface with an inclined structure. The limiting stop surface with the inclined structure cooperates with the surface of the armature that is away from the iron core at an acute angle.

3. The housing for an electromagnetic relay according to claim 1, characterized in that: Inside the assembly cavity (11) of the outer shell body (1), at the position corresponding to the bent part of the armature of the assembled electromagnetic relay, there is a second limiting protrusion (13) that constrains and limits the lateral movement and / or outward turning action of the armature (5) under impact. The second limiting protrusion (13) is fitted with the armature (5) in normal operation with a clearance that allows movement.

4. The housing for an electromagnetic relay according to claim 3, characterized in that: The second limiting protrusion (13) inside the outer shell body (1) consists of two sets of protrusions spaced apart along the width direction of the armature (5); In the mating structure with the armature (5), the two sets of second limiting protrusions (13) and the first limiting protrusion (12) in the outer shell body (1) are arranged in a triangular point mating relationship.

5. The housing for an electromagnetic relay according to claim 3 or 4, characterized in that: The second limiting protrusion (13) in the assembly cavity (11) of the outer shell body (1) constrains and limits the lateral movement and outward turning of the armature (5) under impact. The second limiting protrusion (13) cooperates with the area of ​​the armature bending part and has an arc-shaped stop surface (131) with an inward curved surface structure. The arc surface trajectory of the arc-shaped stop surface (131) corresponds to the arc surface trajectory of the armature bending part.

6. The housing for an electromagnetic relay according to claim 3 or 4, characterized in that: The assembly cavity (11) of the outer shell body (1) also has a cavity partition wall (15), which divides the assembly cavity (11) into a magnetic circuit cavity (111) and a contact cavity (112). The second limiting protrusion (13) is formed between the cavity baffle (15) and the top side wall of the outer shell body (1).

7. The housing for an electromagnetic relay according to claim 1 or 3, characterized in that: Inside the assembly cavity (11) of the outer shell body (1), at the position corresponding to the assembled electromagnetic relay spring (6), there is a third limiting protrusion (14) that constrains and limits the spring assembly structure.

8. The housing for an electromagnetic relay according to claim 7, characterized in that: The third limiting protrusion (14) inside the outer shell body (1) consists of two sets, which are respectively placed on both sides of the compression spring (6) of the assembled electromagnetic relay in the width direction, corresponding to the compression spring insertion part on the side. Correspondingly, the compression spring (6) has compression spring clearance notches (61) at the insertion positions on both sides of the transverse width direction for the corresponding third limiting protrusion (14) to pass through. When the outer casing (1) is assembled on the base (2) of the electromagnetic relay, the third limiting protrusion (14) passes through the corresponding spring relief notch (61) on the spring (6) to constrain and limit the corresponding insertion part of the spring (6).

9. An impact-resistant electromagnetic relay, comprising a base (2), a magnetic circuit portion mounted on the base (2), a contact portion mounted on the base (2), a pusher (7) between an armature (5) of the magnetic circuit portion and a moving spring assembly (8) of the contact portion, and a housing; The outer shell, together with the base (2), encloses the magnetic circuit portion, contact portion and push card (7) on the base (2); Its features are: The outer shell is the structure described in any one of claims 1 to 8.

10. The shock-resistant electromagnetic relay according to claim 9, characterized in that: The armature (5) serves as the first end of the first limiting protrusion (12) inside the housing, and has a thickened flat surface (51) on the surface opposite to the iron core.

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