A high current relay using a new type of driving structure

Abstract

The present invention relates to a high-current relay using a novel push structure, comprising a plastic push rod, a moving contact spring, a moving armature, and a static contact, wherein the moving contact spring faces the static contact and a moving contact is arranged at the position facing the moving contact, the push rod comprises a connecting portion, a push spring, and an expanding portion extending along the moving contact spring, the connecting portion is used to be connected to the moving armature, the push spring and the expanding portion are not fixedly connected to the moving contact spring, the expanding portion is located on the side of the moving contact spring facing the static contact, the push spring is located on the side of the moving contact spring away from the static contact, the push spring comprises a heat dissipation portion bent to increase the heat dissipation area, one end of the heat dissipation portion is connected to the push rod, and the other end faces the moving contact spring, the push rod can drive the moving contact spring to approach or move away from the static contact through the expanding portion and the push spring, and there is a gap between the expanding portion and the push spring, so that when the push spring abuts against the moving contact spring, there is a gap between the expanding portion and the moving contact spring.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular to a high-current relay using a novel driving structure. Background Art

[0002] The driving structure of the existing high-current relay is provided with a spring sheet for driving the moving contact spring sheet. The spring sheet is fixedly connected to the moving contact spring sheet and the driving structure respectively, so that the driving structure can drive the moving contact spring sheet to approach the static contact. In this structure, when the relay passes current, the current flows through the moving contact spring sheet. Under the action of the current, the spring sheet will generate heat proportional to the square of the current. When the current increases, the heat increases at a multiple of the square of the current. Therefore, when the relay passes a large current, the moving contact spring sheet heats up very seriously. At this time, the excessive heat will be transferred to the driving structure through the spring sheet. Since the driving structure is made of plastic material, the heating phenomenon caused by the large current will cause the connection between the driving structure and the spring sheet to dissolve, affecting the use of the relay. Summary of the invention

[0003] The purpose of the present invention is to provide a high-current relay using a novel driving structure, which can reduce the influence of heat generated when a high current is passed through the relay on the relay driving structure.

[0004] To this end, a high-current relay using a new type of pushing structure is provided, including a plastic pushing rod, a moving contact spring, a moving armature, and a static contact, wherein the moving contact spring is directly opposite to the static contact and a moving contact is arranged at the place directly opposite to the moving contact, the pushing rod includes a connecting portion, a pushing spring and an expanding portion extending along the moving contact spring, wherein the connecting portion is used to connect with the moving armature so that the moving armature can drive the pushing rod close to or away from the static contact, the pushing spring and the expanding portion are not fixedly connected to the moving contact spring, the expanding portion is located on the side of the moving contact spring facing the static contact, the pushing spring is located on the side of the moving contact spring away from the static contact, the pushing spring includes a heat dissipation portion bent to increase the heat dissipation area, one end of the heat dissipation portion is connected to the pushing rod, and the other end faces the moving contact spring, the pushing rod can drive the moving contact spring close to or away from the static contact through the expanding portion and the pushing spring, and there is a gap between the expanding portion and the pushing spring, so that when the pushing spring is against the moving contact spring, there is a gap between the expanding portion and the moving contact spring.

[0005] Furthermore, the heat dissipation portion is bent into a semicircular arc.

[0006] Furthermore, the end of the heat dissipation portion facing the moving contact spring has a heat-insulating top end to enable the moving contact spring to be in linear contact with the pushing spring.

[0007] Further, the thermally insulating top end is one of the following:

[0008] A straight metal sheet, which is perpendicular to the moving contact spring in a normal state, one end of which is away from the moving contact spring is connected to one end of the heat dissipation portion facing the moving contact spring, and one side of which faces the moving contact spring is a plane parallel to the moving contact spring in a normal state;

[0009] One end of the arc-shaped metal sheet is connected to one end of the heat dissipation portion facing the moving contact spring sheet, and when the arc-shaped metal sheet contacts the moving contact spring sheet, the arc-shaped metal sheet is tangent to the moving contact spring sheet.

[0010] Furthermore, the heat-insulating top end and the heat-dissipating portion are integrally formed.

[0011] Furthermore, one end of the expansion portion facing the moving contact spring piece has a heat insulation portion to enable point contact or line contact between the expansion portion and the moving contact spring piece.

[0012] Furthermore, the heat insulating portion is a spherical protrusion or an arc-shaped strip facing the outer surface of the moving contact spring piece. When the heat insulating portion contacts the moving contact spring piece, the heat insulating portion is tangent to the moving contact spring piece.

[0013] Furthermore, the heat insulation portion and the deployment portion are integrally formed.

[0014] Furthermore, it also includes a moving contact piece and a static contact piece for passing a large current, the moving contact piece and the static contact piece are thicker metal pieces that are difficult to bend, the moving contact spring piece is a thinner metal piece that is easy to bend, the static contacts are an even number and are arranged in an array on the side of the static contact piece facing the moving contact, the moving contact spring piece is the same in number as the static contacts, the push rod passes through the moving contact piece, the moving contact spring piece is divided into two groups of the same number and distributed on both sides of the push rod, the push rod synchronously drives all the moving contact spring pieces to approach or move away from the static contact, the static contact point corresponds to the moving contact spring piece one by one, and the ends of all the moving contact spring pieces away from the push rod are fixedly connected to the moving contact piece, thereby realizing the diversion and aggregation of current from the static contact to the moving contact piece.

[0015] Furthermore, a limiting groove is provided at a position of the push rod facing the moving contact piece, and the moving contact piece is inserted into the limiting groove and can be displaced in the limiting groove along the up and down stroke direction of the push rod.

[0016] Beneficial effects:

[0017] The push spring and the moving contact spring are not fixedly connected. Since there is no need for a fixed connection between the two, the contact area does not need to be made large to make the connection stable, which reduces the contact area between the push spring and the moving contact spring, reduces the heat transfer, and at the same time, the bent heat dissipation part increases the heat dissipation capacity of the push spring, reducing the impact of heat generated when the relay passes a large current on the relay propulsion structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the propulsion structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the enlarged structure of the push reed of the present invention;

[0021] Figure 3 It is an enlarged structural schematic diagram of the unfolding portion of the push rod of the present invention. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0023] See Figure 1 The pushing structure of the present invention includes a pushing rod 1 as a pushing connection structure, one end of the pushing rod 1 is provided with a connecting groove 13, the pushing rod part of the relay movable armature 2 is inserted into the connecting groove 13 of the pushing rod 1, one end of the pushing rod 1 is transmission-connected with the movable armature 2, and the movable armature 2 can be controlled by the coil to drive the pushing rod 1 to move up and down.

[0024] The moving contact assembly 3 of the relay includes a moving contact piece 31 and four straight moving contact springs 32, and the stationary contact assembly 4 includes an L-shaped and thicker stationary contact piece 41 and four stationary contacts 42. One side of the stationary contact piece 41 extends out of the relay housing (not shown) for external wire connection, and the other side is suspended on the moving armature 2, and four stationary contacts 42 are arranged in an array facing one side of the moving armature 2. The moving contact piece 31 is a thicker U-shaped metal piece to reduce resistance to pass large currents, and part of it extends out of the relay housing for external wiring. Since too thick a metal piece cannot have elasticity, four thinner metal springs are set as moving contact springs 32 to correspond to a stationary contact 42 respectively. One end of the four moving contact springs 32 is close to the stationary contact assembly 4, and the moving contact springs 32 are respectively provided with moving contacts 33 at the locations opposite to each stationary contact 42 on the stationary contact assembly 4, and the other end of the moving contact springs 32 is respectively connected to the moving contact One end of the contact piece 31 is fixedly connected by a rivet, and both ends of the moving contact contact piece 31 extend outward along the moving contact spring piece 32, thereby increasing the contact area between the moving contact spring piece 32 and the moving contact contact piece 31 and reducing the resistance. The four moving contact spring pieces 32 do not contact each other. The current on the static contact contact piece 41 flows to the moving contact contact piece 31 through the four moving contact spring pieces 32 respectively. The four moving contact spring pieces 32 produce a shunting effect to reduce the current flowing through a single moving contact spring piece 32, so that the relay can pass a large current and reduce heat generation.

[0025] There is a gap between the moving contact piece 31 and the housing or a hole is opened on the moving contact piece 31 for the push rod to pass through. Four moving contact springs 32 are arranged in pairs on both sides of the push rod 1 along the direction of the moving contact piece 31. The push rod 1 passes through the moving contact piece 31 and the moving contact spring 32 in sequence. The part of the push rod 1 located between the moving contact spring 32 and the static contact 42 has the following Figure 3 The unfolded portion 12 is unfolded along the moving contact spring 32, so that the entire push rod 1 presents a T-shaped structure. The push rod 1 is provided with a plurality of movable contact springs 32 and a movable contact contact 31. Figure 2The U-shaped push spring 11 shown has a straight U-shaped bottom and is horizontal to the moving contact spring 32 passing through the push rod 1. The push spring 11 and the push rod 1 are injection molded as one body so as to be fixedly connected. The push rod 1 can drive the push spring 11 to move along the direction of the push rod 1, and the opening of the push spring 11 is toward the moving contact spring 32. The two wings of the push spring 11 are semicircular heat dissipation parts 112 radially facing the push rod. The semicircular heat dissipation part not only increases the heat dissipation area of ​​the push spring 11, but when the push rod 1 drives the push spring 11 to move up and support the moving contact spring 32, the heat conducted through the push spring 11 is dissipated through the two semicircular wings, avoiding high temperature from being transferred to the push rod 1 and causing the push rod 1 to dissolve. More importantly, the yield stress of the push spring 11 of this shape is relatively large. When the push spring 11 drives the moving contact spring 32 to approach the static contact 42, it is not easy to plastically deform. After multiple uses, it can still maintain a large elasticity, thereby extending the service life of the spring.

[0026] A limiting groove 14 is formed along the moving contact piece 31 at a portion of the push rod 1 facing the moving contact piece 31, and a positioning groove 311 is formed on the moving contact piece 31 to be aligned with the limiting groove 14. The moving contact piece 31 is inserted into the limiting groove 14 so that the moving contact piece 31 and the push rod 1 form an interlocking structure, thereby limiting the upward and downward movement of the limiting groove 14. The width of the positioning groove 14 is greater than the width of the moving contact piece 31, so that there is a gap between the moving contact piece 31 and the push rod 1, and no friction occurs with the push rod 1 to affect the upward and downward movement of the push rod 1. The side of the limiting groove 14 close to the static contact assembly 4 allows the static contact 42 to contact the moving contact 33, and the side of the limiting groove 14 away from the static contact assembly 4 limits the push rod 1 to prevent the push rod 1 from driving the moving contact spring piece 32 to move excessively downward, resulting in the moving contact spring piece 32 being unable to rebound or having difficulty in rebounding after excessive reverse bending.

[0027] See Figure 2 The heat dissipation portion 112 of the push spring 11 faces the top of the moving contact spring 32 and has a straight sheet-shaped heat-insulating top 111 perpendicular to the moving contact spring 32. The side of the heat-insulating top 111 facing the moving contact spring 32 is normally parallel to the plane of the moving contact spring 32. At the same time, the push spring 11 and the moving contact spring 32 are not fixedly connected. Since there is no need for a fixed connection between the two, the contact area does not need to be made large to make the connection stable, thereby reducing the contact area and reducing the heat transfer. In addition, when the push spring 11 drives the moving contact spring 32 to approach the static contact 42, the push spring 11 bends, causing the heat-insulating top 111 to tilt toward the side of the moving contact spring 32, and the surface contact between the heat-insulating top 111 and the moving contact spring 32 becomes line contact, further reducing the contact area between the push spring 11 and the moving contact spring 32, and further reducing the heat transfer.

[0028] The heat-insulating top 111 here can also be a bent arc shape, which is tangent to the moving contact spring 32. The part of the heat-insulating top 111 away from the push rod 1 is connected to the heat dissipation part 112 to enhance the overall structural strength of the pushing spring 11. The heat dissipation capacity and the ability to drive the moving contact spring 32 of the arc-shaped heat-insulating top 111 are better than those of the straight sheet-shaped heat-insulating top 111, but its processing and molding are more difficult and the cost is higher, so it is a second choice.

[0029] When the push rod 1 drives the moving contact spring 32 to move downward, the two come into contact. Although the static contact 42 and the moving contact 33 are separated at this time, the circuit is disconnected, and the moving contact spring 32 no longer generates heat, the residual heat on the moving contact 32 may still affect the two wings of the push rod 1. Figure 3 , there is a cylindrical insulation part 121 with a semicircular cross-section on the T-shaped wings of the push rod 1 toward the moving contact spring 32. Since the side surface of the insulation part 121 is an arc-shaped structure, the insulation part 121 must be tangent to the plane surface of the moving contact spring 32 when in contact, and the two are in line contact, thereby reducing the transfer of residual heat on the moving contact spring 32 to the two wings of the push rod 1 when the push rod 1 drives the moving contact spring 32 to move downward. The semicircular arc surface increases the heat dissipation area and reduces the risk of dissolution caused by the contact between the two wings of the push rod 1 and the moving contact spring 32.

[0030] The heat insulating portion 121 here can also be a hemispherical protrusion, which is tangent to the moving contact spring 32 so that the two are in point contact. This solution has a better heat insulation effect than the line contact solution, but the protrusion itself is more prone to wear. After wear, the point contact will become surface contact, reducing or losing the heat insulation effect, so it is a second choice.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A high current relay using a novel push structure, comprising a plastic push rod (1), a moving contact spring (32), a moving armature (2), and a stationary contact (42), wherein the moving contact spring (32) is directly opposite to the stationary contact (42) and a moving contact (33) is arranged at the position directly opposite to the moving contact spring (32), and the push rod (1) comprises a connecting portion (13), a push spring (11), and an extended portion (12) extending along the moving contact spring (32), wherein: The connecting portion (13) is used to connect with the movable armature (2) so that the movable armature (2) can drive the push rod (1) to approach or move away from the stationary contact (42), and is characterized in that: the push spring (11) and the expansion portion (12) are not fixedly connected to the movable contact spring (32), the expansion portion (12) is located on the side of the movable contact spring (32) facing the stationary contact (42), the push spring (11) is located on the side of the movable contact spring (32) away from the stationary contact (42), and the push spring (11) includes a bend to increase A heat dissipation portion (112) with a large heat dissipation area, one end of the heat dissipation portion (112) is connected to the push rod (1), and the other end faces the moving contact spring (32), the push rod (1) can drive the moving contact spring (32) to approach or move away from the static contact through the expansion portion (12) and the push spring (11), and there is a gap between the expansion portion (12) and the push spring (11), so that when the push spring (11) abuts against the moving contact spring (32), there is a gap between the expansion portion and the moving contact spring (32); One end of the expansion portion (12) facing the moving contact spring (32) has a heat insulation portion (121) to achieve point contact or line contact between the expansion portion and the moving contact spring (32); The invention also comprises a moving contact piece (31) and a stationary contact piece (41) for passing a large current, wherein the moving contact piece (31) and the stationary contact piece (41) are thicker metal sheets that are difficult to bend, the moving contact spring piece (32) is a thinner metal sheet that is easy to bend, the stationary contacts (42) are an even number and are arranged in an array on a side of the stationary contact piece (41) facing the moving contact (33), the moving contact spring piece (32) and the stationary contacts (42) are the same in number, and the push rod (1) passes through the moving contact piece The movable contact spring (31) is divided into two groups of equal number and distributed on both sides of the push rod (1). The push rod (1) synchronously drives all the movable contact springs (32) to approach or move away from the stationary contact (42). The stationary contact (42) corresponds to the movable contact spring (32) one by one. The ends of all the movable contact springs (32) away from the push rod (1) are fixedly connected to the movable contact contact (31), thereby realizing the current diversion and aggregation between the stationary contact (42) and the movable contact contact (31).

2. A high current relay using a novel driving structure according to claim 1, characterized in that: The heat dissipation portion (112) is bent into a semicircular arc.

3. A high current relay using a novel driving structure according to claim 1, characterized in that: The end of the heat dissipation portion (112) facing the moving contact spring (32) has a heat-insulating top end (111) to enable the moving contact spring (32) to be in line contact with the pushing spring (11).

4. A high current relay using a novel driving structure according to claim 3, characterized in that: The heat-insulating top end (111) is one of the following: A straight metal sheet, which is perpendicular to the moving contact spring (32) in a normal state, one end of which is away from the moving contact spring (32) is connected to an end of the heat dissipation portion (112) facing the moving contact spring (32), and one side of which faces the moving contact spring (32) is a plane parallel to the moving contact spring (32) in a normal state; An arc-shaped metal sheet has one end connected to one end of the heat dissipation portion (112) facing the moving contact spring sheet (32); when the arc-shaped metal sheet contacts the moving contact spring sheet (32), the arc-shaped metal sheet is tangent to the moving contact spring sheet (32).

5. A high current relay using a novel driving structure according to claim 3, characterized in that: The heat-insulating top end (111) and the heat-dissipating portion (112) are integrally formed.

6. A high current relay using a novel driving structure according to claim 1, characterized in that: The heat insulating portion (121) is a spherical protrusion or an arc-shaped long strip facing the outer surface of the moving contact spring (32); when the heat insulating portion (121) is in contact with the moving contact spring (32), the heat insulating portion (121) is tangent to the moving contact spring (32).

7. A high current relay using a novel driving structure according to claim 1, characterized in that: The heat insulation portion (121) and the deployment portion (12) are integrally formed.

8. A high current relay using a novel driving structure according to claim 1, characterized in that: A limiting groove (14) is provided at a location of the push rod (1) facing the moving contact piece (31); the moving contact piece (31) is inserted into the limiting groove (14) and can move in the limiting groove (14) along the up and down travel direction of the push rod (1).

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