A small relay

Abstract

A small relay includes a base, a moving and stationary spring portion, a magnetic circuit portion, and a housing. The base has a mounting cavity, the magnetic circuit portion is located in the mounting cavity, the moving and stationary spring portions are located outside one side of the mounting cavity, and the housing covers the base. The moving and stationary spring portion includes at least one stationary spring plate, which extends along the height direction of the base and has a first insertion terminal passing through the base at one end and a second insertion terminal passing through the housing at the other end. A mounting portion extending along the length direction of the base opposite to the first and second insertion terminals is provided, and a stationary contact is provided on the mounting portion. A groove is also provided on the mounting portion of the stationary spring plate opposite to the side wall of the housing along the length direction of the base. The groove is located on the side of the mounting portion opposite to the side wall of the housing, and the stationary contact is located at the groove and is spaced apart from the opposite side wall of the housing. This invention provides a reasonable layout for the relay components, ensuring a compact layout without affecting the performance of the contact portion.

Description

Technical Field

[0001] This invention relates to the field of relays, and in particular to a small relay. Background Technology

[0002] The push-rod type miniature relay consists of a base, a magnetic circuit section mounted on the base, a push-lock, and contact parts. The contact parts include a moving spring assembly and a stationary spring assembly. The moving spring assembly includes a moving spring with a moving contact, and the stationary spring assembly includes a stationary spring with a stationary contact. The magnetic circuit section includes a coil frame, an iron core, a yoke, and an armature. Its working principle is as follows: when the coil is energized, the iron core generates electromagnetic attraction, driving the armature to swing, which in turn drives the push-lock to push the moving spring, causing the moving contact on the moving spring to close / open with the stationary contact on the stationary spring. When the coil is de-energized or the excitation current decreases to a certain value, the counter-torque of the moving spring exceeds the electromagnetic attraction torque, causing the moving spring to return to its original position and push the push-lock, thereby causing the armature to swing back to its initial state, and the moving contact on the moving spring to open / close with the stationary contact on the stationary spring.

[0003] However, as the applications of relays become increasingly diverse, the requirements for their various parameters are also becoming more stringent. This necessitates that relays not be too large, but reducing size means less internal space, which can easily lead to problems in the layout and installation of components. For example, the creepage distance between the contact parts and the magnetic circuit may be too small; during assembly, the stationary contacts of the stationary springs near the inner wall of the housing may rub against the housing, generating plastic shavings that affect the performance of the contact parts. Summary of the Invention

[0004] The main objective of this invention is to overcome the aforementioned deficiencies in the prior art and to propose a small relay with a reasonable layout of the relay components, ensuring that the layout of the components is compact and does not affect the performance of the contact parts.

[0005] The present invention adopts the following technical solution:

[0006] A small relay includes a base, a moving and stationary spring portion, a magnetic circuit portion, and a housing. The base has a mounting cavity, the magnetic circuit portion is located in the mounting cavity, the moving and stationary spring portion is located outside one side of the mounting cavity, and the housing covers the base. The moving and stationary spring portion includes at least one stationary spring plate, the stationary spring plate extends along the height direction of the base and has a first insertion end passing through the base at one end and a second insertion end passing through the housing at the other end. A mounting portion extending along the length direction of the base relative to the first and second insertion ends is provided between the first and second insertion ends, and a stationary contact is provided on the mounting portion. A groove is also provided on the mounting portion of the stationary spring plate opposite to the side wall of the housing along the length direction of the base. The groove is located on the side of the mounting portion opposite to the side wall of the housing, and the stationary contact is located at the groove and is spaced apart from the opposite side wall of the housing.

[0007] The mounting portion having the groove extends along the length direction of the base away from the corresponding side of the housing, and the groove is recessed into the surface of the mounting portion opposite to the side wall of the housing.

[0008] The magnetic circuit includes a coil assembly, a yoke, an armature, and a pusher; the yoke includes a first yoke portion and a second yoke portion extending along the length direction of the base, the first yoke portion passing through the coil assembly, and one end of the first yoke portion and the second yoke portion being connected; the armature is arranged along the height direction of the base and located at the other end of the first yoke portion and the second yoke portion, one end of the armature overlapping the corresponding end of the second yoke portion; the pusher is arranged along the length direction of the base and one end of it is connected to one end of the armature, the other end of the pusher is connected to the moving spring of the moving and stationary spring portion; the armature swings to drive the pusher to move, thereby driving the moving spring to actuate.

[0009] The coil assembly is further provided with a frame, the frame having a through hole for the first yoke portion to pass through; the frame having a mounting groove and a support plate on the side opposite to the armature, the end of the armature opposite to the first yoke portion being located in the mounting groove; the support plate being installed on the side of the mounting groove away from the second yoke portion to support the armature.

[0010] The mounting groove includes two sidewalls spaced apart along the width direction of the base. A limiting groove is provided on the side of the sidewall near the second yoke portion, and the limiting groove extends along the height direction of the base. The armature is provided with two slots on both sides of the base in the width direction. The two slots extend opposite to each other along the width direction of the base and are located at the two limiting grooves respectively.

[0011] At least one first slot is provided at the location of the moving and stationary spring portions of the base. The first slot extends through the height direction of the base and has a hollow groove on its side. The first insertion end of the stationary spring is inserted into and passes through the corresponding first slot. The moving contact of the moving and stationary spring portions is located above the hollow groove.

[0012] The height of the sidewall of the mounting cavity is greater than the height of the sidewall of the first slot.

[0013] A second slot is also provided outside the mounting cavity on the base. The second slot is located on the side of the base away from the second slot in the width direction. The moving and stationary spring portion is provided with a moving spring plate and a moving spring lead plate. The moving spring lead plate is inserted into and passes through the second slot. One end of the moving spring plate is connected to the moving spring lead plate, and the other end of the moving spring plate extends along the width direction of the base to the top of the empty slot and is provided with the moving contact.

[0014] The outer casing is provided with at least one first receiving groove and a second receiving groove extending along the height direction of the base on the side away from the base; the second insertion end of the stationary spring sheet of the moving and stationary spring portion is inserted into the first receiving groove in a corresponding manner; the end of the moving spring lead-out sheet away from the base is inserted into the second receiving cavity.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The relay of the present invention provides a receiving cavity to separate the magnetic circuit part from the moving and stationary spring parts, thereby achieving insulation and creepage isolation between the frame-type moving and stationary spring parts and the magnetic circuit part. A groove is provided on the mounting part of the stationary spring sheet opposite to the side wall of the housing to ensure that there is a gap between the riveted stationary contact and the side wall of the housing, thereby avoiding friction between the housing and the stationary contact during assembly and ensuring reliable contact performance of the moving and stationary spring parts.

[0017] 2. The relay of the present invention includes a coil assembly, a yoke, an armature, and a pusher; the yoke is provided with a first yoke part and a second yoke part, the first yoke part is inserted through the coil assembly, the armature is connected to the second yoke part and connected to the pusher, and the armature swings to drive the pusher to move and drive the moving spring to act. With this pusher structure, the magnetic circuit part is compact and the overall volume is reduced.

[0018] 3. The relay of the present invention has a mounting groove and a support plate on the side of the frame opposite to the armature, and the corresponding end of the armature is located in the mounting groove; the support plate is installed in the mounting groove to support the armature; the side wall of the mounting groove is provided with a limiting groove, and the armature is provided with a corresponding locking groove, and the swing of the armature is limited by the locking groove being located in the two limiting grooves.

[0019] 4. The relay of the present invention has a first slot and a second slot on the base. The first insertion end of the stationary spring is inserted into and passes through the first slot, and the moving spring lead-out piece is inserted into and passes through the second slot. An empty slot is provided between two adjacent first slots, which ensures that the insertion connection between the stationary spring and the moving spring lead-out piece and the base is more stable, and also increases the insulation creepage distance.

[0020] 5. The relay of the present invention further includes a first receiving groove and a second receiving groove on the base, which are respectively used to accommodate the second insertion end of the stationary spring and the corresponding end of the moving spring lead-out piece, and to strengthen the insulation between adjacent stationary springs and between the moving spring and the stationary spring lead-out piece. Attached Figure Description

[0021] Figure 1 This is an overall diagram of the invention;

[0022] Figure 2 for Figure 1 The main view;

[0023] Figure 3 for Figure 1 Exploded view;

[0024] Figure 4 Layout of the main components of this invention Figure 1 ;

[0025] Figure 5 Layout of the main components of this invention Figure 2 ;

[0026] Figure 6 This is a structural diagram of the stationary reed;

[0027] Figure 7 for Figure 6 Side view;

[0028] Figure 8 for Figure 6 The main view;

[0029] Figure 9 This is a structural diagram of the base;

[0030] Figure 10 Diagram showing the fit between the armature and the frame;

[0031] Figure 11 for Figure 1 A sectional view;

[0032] in:

[0033] 10. Base; 11. Mounting cavity; 12. First slot; 13. Second slot; 14. Empty slot; 15. Recess; 20. Moving and stationary spring parts; 21. Stationary spring; 21a. First insertion end; 21b. Second insertion end; 21c. Mounting part; 21d. Groove; 22. Stationary contact; 22a. Contact rod; 23. Moving spring; 24. Moving spring lead-out piece; 25. Moving contact; 30. Magnetic circuit part; 31. Coil assembly; 31a. Frame; 31b. Mounting groove; 31c. Support piece; 31d. Limiting groove; 32. Yoke; 32a. First yoke part; 32b. Second yoke part; 32c. Protrusion; 33. Armature; 33a. Slot; 34. Pushing slot; 40. Outer shell; 41. First receiving groove; 42. Second receiving groove.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0035] The present invention will be further described below through specific embodiments.

[0036] See Figures 1 to 11 A small relay includes a base 10, a moving and stationary spring portion 20, a magnetic circuit portion 30, and a housing 40. The base 10 has a mounting cavity 11 with an opening at the top. The magnetic circuit portion 30 is located inside the mounting cavity 11. The moving and stationary spring portion 20 is located outside one side of the mounting cavity 11. The magnetic circuit portion 30 and the moving and stationary spring portion 20 can be distributed along the length direction of the base 10, with the moving and stationary spring portion 20 located near one side of the base 10 along its length. The housing 40 covers the base 10, enclosing the mounting cavity 11, thus enclosing the base 10, the moving and stationary spring portion 20, and the magnetic circuit portion 30 within the mounting cavity 11.

[0037] The dynamic and static spring portion 20 includes at least one static spring 21. The static spring 21 extends along the height direction of the base 10, and one end of it has a first insertion end 21a that passes through the base 10, with the first insertion end 21a partially exposed outside the base 10. The other end of the static spring 21 has a second insertion end 21b that passes through the outer casing 40. A mounting portion 21c is provided between the first insertion end 21a and the second insertion end 21b. The mounting portion 21c extends along the length direction of the base 10 relative to the first insertion end 21a and the second insertion end 21b, and a stationary contact 22 is riveted to the mounting portion 21c. The dynamic and static spring portion 20 may have one static spring 21, two static springs 21, or more. The figure shows two static springs 21 as an example, with the two static springs 21 spaced apart along the length direction of the base 10. Along the length of the base 10, one stationary spring 21 is close to the mounting cavity 11 and can serve as a normally open contact; the other stationary spring 21 is far from the mounting cavity 11 and close to the side wall of the housing 40 and can serve as a normally closed contact. The two mounting portions 21c of the two stationary springs 21 can extend in the same or different directions. In the figure, the two mounting portions 21c extend in opposite directions and towards each other. The two stationary contacts 22 are arranged opposite to each other.

[0038] Furthermore, a groove 21d is provided on the mounting portion 21c of the stationary spring 21, which is opposite to the side wall of the base 10 of the housing 40 along its length. The groove 21d is located on the side of the mounting portion 21c opposite to the side wall of the housing 40. The contact rod 22a of the stationary contact 22 passes through the groove 21d, and there is a gap between the contact rod 22a and the opposite side wall of the housing 40. The mounting portion 21c with the groove 21d extends along the length of the base 10 away from the corresponding side of the housing 40. The groove 21d is recessed in the surface of the mounting portion 21c opposite to the side wall of the housing 40, and the size of the groove 21d is larger than the size of the contact rod 22a. By designing a stamped groove in the mounting portion 21c of the stationary spring 21, the surface of the contact rod 22a of the stationary contact 22 is recessed relative to the corresponding surface of the mounting portion 21c, without exceeding the surface of the stationary spring 21, thus avoiding friction between the housing 40 and the contact rod 22a of the stationary contact 22 during assembly.

[0039] The stationary and movable spring section 20 is further provided with a movable spring plate 23 and a movable spring lead-out plate 24. The movable spring lead-out plate 24 is located outside the mounting cavity 11 and on the side of the base 10 away from the stationary spring plate 21 in the width direction. The movable spring lead-out plate 24 extends along the height direction of the base 10, with one end passing through the base 10. One end of the movable spring plate 23 is fixedly connected to the movable spring lead-out plate 24, and the other end of the movable spring plate 23 extends along the width direction of the base 10 to be opposite to the stationary spring plate 21. The movable spring plate 23 is provided with a movable contact 25 opposite to the stationary contact 22. In the figure, the movable contact 25 is opposite to the two stationary contacts 22 and is located between the two stationary contacts 22. The movable contact 25, the movable spring lead-out plate 24, and the movable spring plate 23 are connected by riveting.

[0040] In this invention, the magnetic circuit portion 30 includes a coil assembly 31, a yoke 32, an armature 33, and a pusher 34. The coil assembly 31 is arranged along the length direction of the base 10. The yoke 32 includes a first yoke portion 32a and a second yoke portion 32b extending along the length direction of the base 10. The first yoke portion 32a passes through the coil assembly 31 as an iron core, and the first yoke portion 32a and the second yoke portion 32b are connected at one end along the length direction of the base 10. The second yoke portion 32b has protrusions 32c on both sides in the width direction of the base 10, and the mounting cavity 11 has recesses 15 on the top of the two side walls in the width direction of the base 10. The two protrusions 32c of the second yoke portion 32b are respectively embedded in the two recesses 15 to position the second yoke portion 32b. The armature 33 is arranged along the height direction of the base 10 and is located at the other end of the first yoke portion 32a and the second yoke portion 32b. One end of the armature 33 is attached to the corresponding end of the second yoke 32b, and the other end of the armature 33 is opposite to the corresponding end of the first yoke 32a. A pusher 34 is located above the second yoke 32b and is arranged along the length of the base 10. One end of the pusher 34 is connected to one end of the armature 33, and the other end of the pusher 34 is connected to the moving spring 23 of the moving and stationary spring section 20. The pusher 34 can be driven to move along the length of the base 10. The armature 33 swings, causing the pusher 34 to move and thus the moving spring 23 to move; or the moving spring 23 returns to its original position, causing the pusher 34 to move and the armature 33 to swing back to its original position. In the figure, the movement of the moving spring 23 can cause the moving contact 25 to close with one of the stationary contacts 22 and separate from the other stationary contact 22.

[0041] Furthermore, the coil assembly 31 is also provided with a frame 31a, which has a through hole for the first yoke portion 32a to pass through, and a coil is wound around the outer periphery of the frame 31a. A mounting groove 31b and a support plate 31c are provided on the side of the frame 31a opposite to the armature 33. The end of the armature 33 opposite to the first yoke portion 32a is located within the mounting groove 31b, and a space is formed between the mounting groove 31b and the opposite sidewall of the mounting cavity 11 to accommodate the swinging of the armature 33. The support plate 31c is installed on the side of the mounting groove 31b away from the second yoke portion 32b to support the armature 33.

[0042] The mounting groove 31b includes two sidewalls spaced apart along the width direction of the base 10. A limiting groove 31d is provided on the side of the sidewall closest to the second yoke 32b, extending along the height direction of the base 10. The armature 33 has two locking slots 33a on each side of the base 10 in the width direction. These two slots 33a extend opposite each other along the width direction of the base 10 and are located at the two limiting grooves 31d. The space between the mounting groove 31b and the opposite sidewall of the mounting cavity 11, along with the cooperation of the locking slots 33a and the limiting grooves 31d, limits the swing of the armature 33, ensuring more reliable and accurate swing of the armature 33.

[0043] In this embodiment, at least one first slot 12 is provided at the location of the stationary and moving spring portions 20 of the base 10. The first slot 12 extends through the height of the base 10, and a slot 14 is provided on the outer side of the first slot 12. The first insertion end 21a of the stationary spring 21 is inserted into and passes through the corresponding first slot 12 to ensure the stability of the insertion of the stationary spring 21. The stationary contact 22 is located above the first slot 12. In the figure, two first slots 12 are used as an example. The two first slots 12 are spaced apart, and the slot 14 is located between the two adjacent first slots 12. The first insertion ends 21a of the two stationary springs 21 are respectively inserted into and pass through the corresponding first slots 12. The moving contact 25 of the stationary and moving spring portions 20 is located above the slot 14. By providing slots for the stationary springs 21 to pass through on the base 10 and providing slots 14 between the slots, the insulation creepage distance can be increased.

[0044] A second slot 13 is also provided outside the mounting cavity 11 on the base 10. The second slot 13 is located on the side of the base 10 away from the second slot 13 in the width direction. The moving spring lead-out piece 24 of the moving and stationary spring portion 20 is inserted into and passes through the second slot 13. The height of the side wall of the mounting cavity 11 is greater than or equal to the height of the side wall of the second slot 13. This frame-like structure of the mounting cavity 11 can increase the insulation and creepage isolation between the magnetic circuit portion 30 and the contact portion, and enhance the insulation performance between the coil and the contact.

[0045] The bottom opening of the outer casing 40 covers the base 10. At least one first receiving groove 41 and a second receiving groove 42 extending along the height direction of the base 10 are provided on the side of the outer casing 40 away from the base 10. The second insertion ends 21b of the stationary spring pieces 21 of the stationary spring portion 20 are correspondingly inserted into the first receiving groove 41. The end of the moving spring lead-out piece 24 away from the base 10 is inserted into the second receiving cavity. The dimension of the first receiving groove 41 in the height direction of the base 10 corresponds to the dimension of the second insertion 21d of the stationary spring piece 21, and the dimension of the second receiving groove in the height direction of the base 10 corresponds to the dimension of the corresponding end of the moving spring lead-out piece 24. In the figure, two first receiving grooves 41 are provided to accommodate the second insertion ends 21b of the corresponding two stationary spring pieces 21, and a second receiving groove 42 is provided to accommodate the corresponding end of the corresponding moving spring lead-out piece 24, to strengthen the insulation between adjacent stationary spring pieces 21 and between the moving spring lead-out piece 24 and the stationary spring piece 21 in the stationary spring portion 20.

[0046] The relay of the present invention, with Figure 10For example, under normal conditions, the moving contact 25 of the moving spring 23 is in contact with the stationary contact 22 of the normally closed stationary spring 21. When the coil assembly 31 is energized, the first yoke 32a generates an electromagnetic attraction force that drives the armature 33 to engage. The armature 33 drives the pusher 34 to pull the moving spring 23, causing the moving contact 25 to disconnect from the normally closed stationary contact 22 of the stationary spring 21 and connect with the normally open stationary contact 22 of the stationary spring 21. When the coil assembly 31 is de-energized, under the reaction force of the moving spring 23, the moving contact 25 disconnects from the normally open stationary contact 22 of the stationary spring 21 and closes with the normally closed stationary contact 22 of the stationary spring 21. The moving spring 23 also drives the pusher 34 and the armature 33 to return to the normal state.

[0047] In this invention, the terms "first," "second," and "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," and "rear" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] Furthermore, in the description of this application, unless otherwise stated, "multiple" means 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.

[0049] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A miniature relay, comprising a base, a moving and stationary spring portion, a magnetic circuit portion, and a housing; characterized in that: The base has a mounting cavity, the magnetic circuit portion is located in the mounting cavity, the dynamic and static spring portion is located outside one side of the mounting cavity, and the outer shell covers the base; the dynamic and static spring portion includes at least one static spring plate, the static spring plate extends along the height direction of the base and has a first insertion end through the base at one end and a second insertion end through the outer shell at the other end, a mounting portion is provided between the first insertion end and the second insertion end, extending along the length direction of the base relative to the first insertion end and the second insertion end, and a static contact is provided on the mounting portion; a groove is also provided on the mounting portion of the static spring plate opposite to the side wall of the outer shell in the length direction of the base, the groove is located on the side of the mounting portion opposite to the side wall of the outer shell, and the static contact is located at the groove and is spaced apart from the opposite side wall of the outer shell.

2. A miniature relay as described in claim 1, characterized in that: The mounting portion having the groove extends along the length direction of the base away from the corresponding side of the housing, and the groove is recessed into the surface of the mounting portion opposite to the side wall of the housing.

3. A miniature relay as described in claim 1, characterized in that: The magnetic circuit includes a coil assembly, a yoke, an armature, and a pusher; the yoke includes a first yoke portion and a second yoke portion extending along the length direction of the base, the first yoke portion passing through the coil assembly, and one end of the first yoke portion and the second yoke portion being connected; the armature is arranged along the height direction of the base and located at the other end of the first yoke portion and the second yoke portion, one end of the armature overlapping the corresponding end of the second yoke portion; the pusher is arranged along the length direction of the base and one end of it is connected to one end of the armature, the other end of the pusher is connected to the moving spring of the moving and stationary spring portion; the armature swings to drive the pusher to move, thereby driving the moving spring to actuate.

4. A miniature relay as described in claim 3, characterized in that: The coil assembly is further provided with a frame, the frame having a through hole for the first yoke portion to pass through; the frame having a mounting groove and a support plate on the side opposite to the armature, the end of the armature opposite to the first yoke portion being located in the mounting groove; the support plate being installed on the side of the mounting groove away from the second yoke portion to support the armature.

5. A miniature relay as described in claim 4, characterized in that: The mounting groove includes two sidewalls spaced apart along the width direction of the base. A limiting groove is provided on the side of the sidewall near the second yoke portion, and the limiting groove extends along the height direction of the base. The armature is provided with two slots on both sides of the base in the width direction. The two slots extend opposite to each other along the width direction of the base and are located at the two limiting grooves respectively.

6. A miniature relay as described in claim 1, characterized in that: At least one first slot is provided at the location of the moving and stationary spring portions of the base. The first slot extends through the height direction of the base and has a hollow groove on its side. The first insertion end of the stationary spring is inserted into and passes through the corresponding first slot. The moving contact of the moving and stationary spring portions is located above the hollow groove.

7. A miniature relay as described in claim 6, characterized in that: The height of the sidewall of the mounting cavity is greater than the height of the sidewall of the first slot.

8. A miniature relay as described in claim 6, characterized in that: A second slot is also provided outside the mounting cavity on the base. The second slot is located on the side of the base away from the second slot in the width direction. The moving and stationary spring portion is provided with a moving spring plate and a moving spring lead plate. The moving spring lead plate is inserted into and passes through the second slot. One end of the moving spring plate is connected to the moving spring lead plate, and the other end of the moving spring plate extends along the width direction of the base to the top of the empty slot and is provided with the moving contact.

9. A miniature relay as described in claim 8, characterized in that: The outer casing is provided with at least one first receiving groove and a second receiving groove extending along the height direction of the base on the side away from the base; the second insertion end of the stationary spring sheet of the moving and stationary spring portion is inserted into the first receiving groove in a corresponding manner; the end of the moving spring lead-out sheet away from the base is inserted into the second receiving cavity.

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