relay

Abstract

To provide a relay that includes a base, a contact part, a push rod assembly, and a magnetic circuit part.SOLUTION: The contact part is arranged on the base and comprises two sets of movable contact parts; each set of the movable contact parts comprises a movable contact piece, a movable contact unit, and a static contact unit; and the movable contact unit is arranged on the movable contact piece. The two movable contact units of the contact part correspond to the two static contact units, respectively. The stiffnesses of two movable contact pieces are different; a push rod assembly comprises a first push rod and a second push rod; the first push rod and the second push rod are connected to the two movable contact pieces, respectively; and a magnetic circuit part is arranged on the base and configured to drive the first push rod and the second push rod to move in opposite directions so as to drive the two movable contact pieces toward or away from each other, achieving contact or separation of the static contact unit and the movable contact unit.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the technical field of electronic control elements, in particular relays. [Background technology]

[0002] A relay is an electronic control element that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and is usually applied to automatic control circuits. A relay is actually an "automatic switch" that controls a large current with a small current. Therefore, in the circuit, it plays roles such as automatic adjustment, safety protection, and conversion circuit.

[0003] The relay includes a magnetic circuit portion, a push rod assembly, and a contact portion. The magnetic circuit portion includes a coil assembly and an armature assembly. The coil assembly drives the armature assembly to move, and the armature assembly drives the contacts of the contact portion via the push rod assembly to close or open them.

[0004] However, in the prior art, the utilization rate of the magnetic driving force generated by the energized coil assembly is low and different contact situations cannot be differentiated. Summary of the Invention

[0005] SUMMARY OF THE INVENTION An embodiment of the present invention provides a relay that overcomes the problem of low utilization of the magnetic driving force of coil assemblies present in the prior art.

[0006] The relay of the embodiment of the present invention includes a base, a contact portion, a push rod assembly, and a magnetic circuit portion; the contact portion is provided on the base and includes two sets of movable contact portions, each set of the movable contact portions includes a movable contact piece, a movable contact unit and a fixed contact unit, the movable contact unit is provided on the movable contact piece, the two movable contact units of the contact portion correspond to the two fixed contact units respectively, and the rigidities of the two movable contact pieces are different; the push rod assembly includes a first push rod and a second push rod, the first push rod and the second push rod being connected to two of the movable contact pieces, respectively; The magnetic circuit portion is provided on the base and is used to drive the first push rod and the second push rod to move in opposite directions, driving the two movable contact pieces to approach or move away from each other, thereby realizing contact or separation between the fixed contact unit and the movable contact unit.

[0007] According to some embodiments of the present invention, when the contact portions are in a disconnected state, a contact gap between the corresponding movable contact unit and the fixed contact unit of one set is smaller than a contact gap between the corresponding movable contact unit and the fixed contact unit of the other set, and the movable contact unit and the fixed contact unit of one set with a smaller contact gap are defined as arc-resistant end contacts, and the movable contact unit and the fixed contact unit of the other set with a larger contact gap are defined as carrier end contacts; The movable contact piece of the movable contact unit corresponding to the carrier end contact is defined as a first movable contact piece, the movable contact piece of the movable contact unit corresponding to the arc-resistant end contact is defined as a second movable contact piece, the first push rod is connected with the first movable contact piece, and the second push rod is connected with the second movable contact piece; The rigidity of the first movable contact piece is smaller than the rigidity of the second movable contact piece.

[0008] According to some embodiments of the present invention, the thickness of the first movable contact piece is smaller than the thickness of the second movable contact piece.

[0009] According to some embodiments of the present invention, the first movable contact piece and the second movable contact piece each include a plurality of stacked sub-contact pieces; The number of the sub-contact pieces of the first movable contact piece is less than the number of the sub-contact pieces of the second movable contact piece.

[0010] According to some embodiments of the present invention, the movable contact unit includes one or more movable contacts, the fixed contact unit includes one or more fixed contacts, corresponding movable contacts and fixed contacts form contact pairs, the arc-resistant end contacts include one or more of the contact pairs, and the carrier end contacts include one or more of the contact pairs; The number of contact sets of the arc-resistant end contacts is less than or equal to the number of contact sets of the carrier end contacts.

[0011] According to some embodiments of the present invention, the arc-resistant end contacts include one or two of the contact sets, The carrier end contacts include two or three of the contact sets.

[0012] According to some embodiments of the present invention, the arc-resistant end contacts include two sets of contacts, and the two sets of contacts are arranged side by side along a width direction of the movable contact portion, The carrier end contacts include two or three of the contact sets, and the two or three contact sets are arranged in parallel along the width direction of the movable contact portion.

[0013] According to some embodiments of the present invention, a slit is formed along the width direction of the movable contact piece in a portion located between two adjacent movable contacts of the movable contact piece.

[0014] According to some embodiments of the present invention, one end of the slit penetrates the end face of the movable contact piece along the length of the movable contact piece, and the other end extends to the fixed contact of the movable contact piece.

[0015] According to some embodiments of the present invention, the movable contact portion of each set further includes a movable contact lead piece, the movable contact lead piece being connected to the movable contact piece; The fixed contact unit is provided at a connection point between the movable contact piece and the movable contactor lead piece.

[0016] According to some embodiments of the present invention, the movable contact piece has a first end and a second end opposite to each other in a longitudinal direction thereof, The movable contact unit is provided at the first end, and the second end is connected to the movable contact lead piece; The first push rod and the second push rod are respectively connected to the first ends of the two movable contact pieces.

[0017] According to some embodiments of the present invention, the magnetic circuit portion includes a coil assembly and an armature assembly, the armature assembly is swingably connected to the base, and the armature assemblies are connected to the first push rod and the second push rod, respectively, and the coil assembly is used to drive the armature assembly to swing; The first push rod and the second push rod are located on opposite sides of the armature assembly, respectively.

[0018] According to some embodiments of the present invention, when the contact portion is in a closed state, the movable contact piece, which has low rigidity, is deformed by the action of the first push rod or the second push rod and has an elastic force, which causes the movable contact piece to tend to move toward a contact-breaking state.

[0019] One embodiment of the above invention has at least the following advantages or beneficial effects: In the relay according to the embodiment of the present invention, when the contacts are switched from a closed state to a disconnected state, the first and second push rods can move the two movable contact pieces, respectively. Because the rigidity of the two movable contact pieces is different, the ability of the two movable contact pieces to resist the elastic deformation of the first and second push rods is also different, resulting in different separating forces provided by the first and second push rods. Therefore, the separating forces of the two push rods can be differentiated according to different contact situations, reducing unnecessary energy loss and improving the overall utilization rate of the coil driving force. [Brief explanation of the drawings]

[0020] [Figure 1] 1 shows a schematic top view of a relay according to an embodiment of the present invention, with the top cover omitted. [Figure 2] This is a schematic diagram in which the base is omitted from FIG. 1, and the contact portion is in a disconnected state. [Figure 3] 1 shows a cross-sectional view of a magnetic circuit portion. [Figure 4] 2 shows a schematic diagram of one contact portion of FIG. 1; [Figure 5] 1 shows a schematic perspective view of a contact portion of a first embodiment of the present invention; [Figure 6] 1 shows a schematic top view of one movable contact portion of a contact portion of a first embodiment of the present invention; [Figure 7] FIG. 1 shows an exploded schematic view of one movable contact portion of the contact portion of the first embodiment of the present invention, in which no slit is provided in the movable contact piece. [Figure 8] FIG. 10 shows a schematic perspective view of a contact portion of a second embodiment of the present invention. [Figure 9] 10 shows a schematic top view of one movable contact portion of a contact portion of a second embodiment of the present invention; [Figure 10] FIG. 10 is an exploded schematic view of one movable contact portion of the contact portion of the second embodiment of the present invention, in which a slit is provided in the movable contact piece. [Figure 11]10 shows a schematic top view of one movable contact portion of a contact portion of a third embodiment of the present invention. [Figure 12] 10 shows a schematic top view of one movable contact portion of a contact portion of a fourth embodiment of the present invention; FIG. [Figure 13] 10 shows a schematic diagram of a contact portion of a fifth embodiment of the present invention. [Explanation of symbols]

[0021] 10. Bass 20, contact part 20a, movable contact part 210, movable contact piece 211, sub-contact piece 212 , carrier body 213, end face 214, Slit 210a, first end 210b, second end 210c, first movable contact piece 210d, second movable contact piece 210e, third movable contact piece 210f, fourth movable contact piece 220, moving contact unit 221, movable contact 230, fixed contact unit 231, fixed contact 240, Movable contact pull-out piece 250, arc-resistant end contacts 260, carrier end contact 30. Magnetic circuit part 310, coil assembly 320, armature assembly 321. Permanent magnets 322, Armature 323, swing arm 40. Push rod assembly 410, first push rod 420, second push rod D1, longitudinal direction D2, width direction DETAILED DESCRIPTION OF THE INVENTION

[0022] Next, exemplary embodiments will be described in more detail with reference to the drawings. However, the exemplary embodiments may be implemented in various forms and should not be understood as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that the present invention will be comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Since the same reference numerals in the drawings represent the same or similar structures, detailed descriptions will be omitted.

[0023] 1 and 2, a relay according to an embodiment of the present invention includes a base 10, a pair of contact portions 20, a magnetic circuit portion 30, and a push rod assembly 40. The pair of contact portions 20 and the magnetic circuit portion 30 are mounted on the base 10, and the magnetic circuit portion 30 drives the contacts of the pair of contact portions 20 via the push rod assembly 40 to achieve closing or opening.

[0024] It will be understood that the terms "comprises" and "having," and any variations thereof, in embodiments of the present invention are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally includes other steps or units inherent to such process, method, product, or device.

[0025] In one embodiment, the base 10 may be substantially cubic, but is not limited to such.

[0026] The pair of contact portions 20 may be arranged on two opposing side surfaces of the magnetic circuit portion 30. Of course, the pair of contact portions 20 may also be arranged on the same side of the magnetic circuit portion 30.

[0027] Each contact portion 20 includes two sets of movable contact portions 20a, and each set of movable contact portions 20a includes a movable contact piece 210, a movable contact unit 220, a fixed contact unit 230, and a movable contact lead piece 240, where the movable contact piece 210 is connected to the movable contact lead piece 240, the movable contact unit 220 is provided on the movable contact piece 210, and the fixed contact unit 230 is provided on the movable contact piece 210 and / or the movable contact lead piece 240. The two movable contact units 220 of each contact portion 20 correspond to the two fixed contact units 230, respectively. The movable contact lead piece 240 is fixedly connected to the base 10.

[0028] The magnetic circuit portion 30 is provided on the base 10 and is used to drive the movement of the four movable contact pieces 210 of the pair of contact portions 20 via the push rod assembly 40, thereby realizing the closing or opening of the movable contact unit 220 and the fixed contact unit 230.

[0029] It should be understood that if the relay of the embodiment of the present invention includes a pair of contact portions 20, and each contact portion 20 can control one circuit, the relay of the embodiment of the present invention can control at least two circuits.

[0030] Of course, in other embodiments, the relay may include only one contact portion 20, and if the contact portion 20 can control one circuit, the relay can control one circuit.

[0031] When the contact portion 20 is in a disconnected state, the contact gap between the corresponding movable contact unit 220 and the fixed contact unit 230 of one set is smaller than the contact gap between the corresponding movable contact unit 220 and the fixed contact unit 230 of the other set.

[0032] As shown in FIG. 2, for the contact portion 20 located above the magnetic circuit portion 30, if the contact gap between the left movable contact unit 220 and the fixed contact unit 230 is H1 and the contact gap between the right movable contact unit 220 and the fixed contact unit 230 is H2, then H1 <H2である。

[0033] Similarly, for the contact part 20 located below the magnetic circuit part 30, if the contact gap between the right-side movable contact unit 220 and the fixed contact unit 230 is H3 and the contact gap between the left-side movable contact unit 220 and the fixed contact unit 230 is H4, then H3 <H4である。

[0034] Note that a design that differentiates the contact gaps between the two sets of movable contact units 220 and fixed contact units 230 can be achieved by lowering the height of the contacts. Specifically, as shown in Figure 2, a description will be given of an example of a contact portion 20 located above a magnetic circuit portion 30. If the contact thickness between the right-side movable contact unit 220 and the fixed contact unit 230 is smaller than the contact thickness between the left-side movable contact unit 220 and the fixed contact unit 230, when the contact portion 20 is in a disconnected state, the contact gap between the right-side movable contact unit 220 and the fixed contact unit 230 is larger than the contact gap between the left-side movable contact unit 220 and the fixed contact unit 230 because the contact thickness on the right side is smaller than the contact thickness on the left side.

[0035] Of course, as long as it is possible to have different contact gaps between the two sets of movable contact units 220 and fixed contact units 230 when the contact portion 20 is in a disconnected state, the design of the different contact gaps can also adopt other methods not listed here, all of which are within the scope of protection of the present invention.

[0036] In the contact part 20 of the embodiment of the present invention, when in the disconnected state, the contact gaps between the two sets of movable contact units 220 and fixed contact units 230 are different. Therefore, in the process of switching the contact part 20 from the closed state to the disconnected state, the set of movable contact unit 220 and fixed contact unit 230 with a larger contact gap is disconnected preferentially over the set of movable contact unit 220 and fixed contact unit 230 with a smaller contact gap. When the set of movable contact unit 220 and fixed contact unit 230 with a larger contact gap has just been disconnected, the set of movable contact unit 220 and fixed contact unit 230 with a smaller contact gap has not yet been completely disconnected. Therefore, the set of movable contact unit 220 and fixed contact unit 230 with a larger contact gap plays the role of conducting electricity, and the set of movable contact unit 220 and fixed contact unit 230 with a smaller contact gap plays the role of arc resistance. Since the pair of movable contact unit 220 and fixed contact unit 230 with a large contact gap does not generate an arc when disconnected, it is only necessary to control the pair of movable contact unit 220 and fixed contact unit 230 with a small contact gap for the contact parameters of the entire contact part 20, without considering the pair of movable contact unit 220 and fixed contact unit 230 with a large contact gap. Compared with the multi-contact design of the prior art, the contact parameters of the contact part 20 of the embodiment of the present invention are easier to control and process, which is advantageous for improving production efficiency.

[0037] As an example, in each set of movable contact portions 20 a, the fixed contact unit 230 is provided at the connection point between the movable contact piece 210 and the movable contact lead piece 240 .

[0038] 1 and 2, the movable contact piece 210 has a first end 210a and a second end 210b arranged opposite to each other in its length direction D1, with the movable contact unit 220 arranged at the first end 210a and the fixed contact unit 230 arranged at the second end 210b. In addition, the second end 210b of the movable contact piece 210 is connected to the movable contactor lead piece 240, so that the fixed contact unit 230 is arranged at the joint between the second end 210b of the movable contact piece 210 and the movable contactor lead piece 240.

[0039] In the contact part 20, two movable contact pieces 210 are arranged in parallel, and the movable contact unit 220 located on the first end 210a of one movable contact piece 210 corresponds to the fixed contact unit 230 located on the second end 210b of the other movable contact piece 210, so that the two pairs of movable contact units 220 and fixed contact units 230 come into contact with each other to form a parallel circuit structure. Designing the contact part 20 as a parallel circuit structure effectively reduces temperature rise.

[0040] 1 and 2, the push rod assembly 40 includes a first push rod 410 and a second push rod 420, which are respectively disposed on two opposite sides of the magnetic circuit portion 30. The magnetic circuit portion 30 is drivingly connected to the first push rod 410 and the second push rod 420, respectively, so that the first push rod 410 and the second push rod 420 move in a reciprocating push-pull manner.

[0041] One end of the first push rod 410 is connected to the first end 210a of one of the movable contact pieces 210 of one of the contact portions 20, and the other end of the first push rod 410 is connected to the first end 210a of one of the movable contact pieces 210 of the other contact portion 20. One end of the second push rod 420 is connected to the first end 210a of the other movable contact piece 210 of one of the contact portions 20, and the other end of the second push rod 420 is connected to the first end 210a of the other movable contact piece 210 of the other contact portion 20.

[0042] In this embodiment, the push rod assembly 40 adopts a double push rod structure of a first push rod 410 and a second push rod 420, and the contacts are closed or opened by the push-pull action of the double push rod structure.

[0043] Specifically, as shown in Figure 2, the first push rod 410 and the second push rod 420 move in opposite directions, so that when the first push rod 410 moves downward, the second push rod 420 moves upward. As the first push rod 410 moves downward, the two movable contact pieces 210 connected to the first push rod 410 both swing downward around their respective second ends 210b. As the second push rod 420 moves upward, the two movable contact pieces 210 connected to the second push rod 420 both swing upward around their respective second ends 210b. In one contact portion 20, the two movable contact pieces 210 swing in opposite directions and move away from each other, thereby disconnecting the movable contact unit 220 and the fixed contact unit 230.

[0044] Conversely, when the first push rod 410 moves upward, the second push rod 420 moves downward. The two movable contact pieces 210 connected to the first push rod 410 both swing upward around their respective second ends 210b, and the two movable contact pieces 210 connected to the second push rod 420 both swing downward around their respective second ends 210b. In one contact part 20, the two movable contact pieces 210 swing in opposite directions and approach each other, thereby realizing the closing of the movable contact unit 220 and the fixed contact unit 230.

[0045] As shown in FIG. 3 , the magnetic circuit portion 30 includes a coil assembly 310 and an armature assembly 320. The armature assembly 320 is swingably connected to the base 10. The coil assembly 310 is used to swing the armature assembly 320 relative to the base 10. The armature assembly 320 includes a permanent magnet 321, an armature 322, and a swing arm 323. There are two armatures 322, and the permanent magnet 321 is interposed between the two armatures 322. The swing arm 323 can be made of an insulating material such as plastic, and the permanent magnet 321, armature 322, and swing arm 323 can be connected as a whole by integral injection molding. Both ends of the swing arm 323 are connected to a first push rod 410 and a second push rod 420, respectively.

[0046] By changing the direction of the magnetic field of the coil assembly 310, the armature assembly 320 is driven to swing relative to the base 10, and the swing arm 323 of the armature assembly 320 drives the reciprocating movement of the first push rod 410 and the second push rod 420, respectively, thereby realizing the disconnection or closing of the movable contact unit 220 and the fixed contact unit 230.

[0047] The two movable contact pieces 210 of the contact portion 20 have different rigidities. For ease of explanation, the two movable contact pieces 210 at the bottom of the magnetic circuit portion 30 in Fig. 2 are defined as the first movable contact piece 210c and the second movable contact piece 210d, respectively, and the two movable contact pieces 210 at the top of the magnetic circuit portion 30 in Fig. 2 are defined as the third movable contact piece 210e and the fourth movable contact piece 210f, respectively. The first movable contact piece 210c and the second movable contact piece 210d have different rigidities. The third movable contact piece 210e and the fourth movable contact piece 210f have different rigidities.

[0048] Rigidity refers to the ability of a material or structure to resist elastic deformation when stressed. The greater the rigidity, the stronger the ability of the material or structure to resist elastic deformation when stressed, and the lower the rigidity, the weaker the ability of the material or structure to resist elastic deformation when stressed. In the embodiment of the present invention, the first movable contact piece 210c and the second movable contact piece 210d have different rigidities, so that the first movable contact piece 210c and the second movable contact piece 210d have different abilities to resist elastic deformation when stressed. The third movable contact piece 210e and the fourth movable contact piece 210f have different rigidities, so that the third movable contact piece 210e and the fourth movable contact piece 210f have different abilities to resist elastic deformation when stressed.

[0049] 2 and 4, one end of the first push rod 410 is connected to the first end 210a of the first movable contact 210c, and the other end of the first push rod 410 is connected to the first end 210a of the fourth movable contact 210f. One end of the second push rod 420 is connected to the first end 210a of the second movable contact 210d, and the other end of the second push rod 420 is connected to the first end 210a of the third movable contact 210e. The first push rod 410 is used to drive the first movable contact 210c and the fourth movable contact 210f to swing about their respective second ends 210b, and the second push rod 420 is used to drive the second movable contact 210d and the third movable contact 210e to swing about their respective second ends 210b.

[0050] It can be appreciated that the coil assembly 310 can be energized to drive the armature assembly 320 to swing relative to the base 10. For example, when a positive current flows through the coil assembly 310, the armature assembly 320 swings clockwise, and when a negative current flows through the coil assembly 310, the armature assembly 320 swings counterclockwise.

[0051] The coil driving force generated after the coil assembly 310 is energized must overcome the magnetic holding force generated in the permanent magnet 321 and the elastic force of the four movable contact pieces 210 themselves connected to the first push rod 410 and the second push rod 420, respectively, and the armature assembly 320 can swing relative to the base 10 only when the coil driving force is greater than the sum of the magnetic holding force and the elastic force.

[0052] When the contact part 20 switches from the closed state to the open state, the first push rod 410 pushes the first movable contact piece 210c to swing downward, and the second push rod 420 pushes the third movable contact piece 210e to swing upward. At the same time, the first push rod 410 pulls the fourth movable contact piece 210f to swing downward, and the second push rod 420 pulls the second movable contact piece 210d to swing upward. The first movable contact piece 210c and the second movable contact piece 210d have different rigidities, and the third movable contact piece 210e and the fourth movable contact piece 210f have different rigidities, so that the first movable contact piece 210c has the ability to resist elastic deformation caused by the pushing force of the first push rod 410, the third movable contact piece 210e has the ability to resist elastic deformation caused by the pushing force of the second push rod 420, the second movable contact piece 210d has the ability to resist elastic deformation caused by the pulling force of the second push rod 420, and the fourth movable contact piece 210f has the ability to resist elastic deformation caused by the pulling force of the first push rod 410. Because the contacts have different abilities to resist thermal deformation, the sum of the separating forces required by the contacts corresponding to H4 and H2 must be smaller than the sum of the separating forces required by the contacts corresponding to H1 and H3. That is, the separating forces acting on the first and third movable contact pieces 210c and 210e of the first and second push rods 410 and 420 are different from the separating forces acting on the second and fourth movable contact pieces 210d and 210f. Therefore, the relay of the embodiment of the present invention can differentiate the separating forces of the two push rods according to different contact states, reducing unnecessary energy loss and improving the utilization rate of the entire coil driving force.

[0053] It should be noted that the stiffness of the two corresponding movable contact pieces 210 can be made different by changing factors such as thickness, length, material, etc. of the two corresponding movable contact pieces 210.

[0054] Of course, the two corresponding movable contact pieces 210 may differ from each other in one or any combination of thickness, length, and material, as long as the stiffness of the two corresponding movable contact pieces 210 is different.

[0055] In the embodiment of the present invention, the thicknesses of the two corresponding movable contact pieces 210 are different.

[0056] The pair of movable contact unit 220 and fixed contact unit 230 with a small contact gap is defined as an arc-resistant end contact 250 , and the other pair of movable contact unit 220 and fixed contact unit 230 with a large contact gap is defined as a carrier end contact 260 .

[0057] In the contact portion 20 located below the magnetic circuit portion 30, the movable contact piece 210 of the movable contact unit corresponding to the carrier end contact 260 is defined as the first movable contact piece 210c, and the movable contact piece 210 of the movable contact unit corresponding to the arc-resistant end contact 250 is defined as the second movable contact piece 210d. The rigidity of the first movable contact piece 210c is smaller than the rigidity of the second movable contact piece 210d.

[0058] In the contact portion located above the magnetic circuit portion 30, the movable contact piece 210 of the movable contact unit corresponding to the carrier end contact 260 is defined as the third movable contact piece 210e, and the movable contact piece 210 of the movable contact unit corresponding to the arc-resistant end contact 250 is defined as the fourth movable contact piece 210f. The rigidity of the third movable contact piece 210e is smaller than the rigidity of the fourth movable contact piece 210f.

[0059] In addition, since the contact gap of the arc-resistant end contact 250 is small, a sticking force is likely to occur when the contacts are disconnected, and there is a possibility that the relay will not be able to be disconnected reliably. Therefore, compared to the carrier end contact 260, the arc-resistant end contact 250 requires a larger disconnection driving force to achieve reliable disconnection.

[0060] In this embodiment of the present invention, the contacts corresponding to H4 and H2 are carrier end contacts 260, and the contacts corresponding to H1 and H3 are arc-proof end contacts 250.

[0061] In this embodiment, since the rigidity of the first movable contact piece 210c is smaller than that of the second movable contact piece 210d, the ability of the first movable contact piece 210c to resist elastic deformation due to the pushing force of the first push rod 410 is weaker than the ability of the second movable contact piece 210d to resist elastic deformation due to the pulling force of the second push rod 420, so that when the contact portion 20 switches from the closed state to the disconnected state, the carrier end contact 260 corresponding to H4 only requires a small disconnection force provided by the first push rod 410 to achieve disconnection. Because the rigidity of the third movable contact piece 210e is smaller than that of the fourth movable contact piece 210f, the ability of the third movable contact piece 210e to resist elastic deformation due to the pushing force of the second push rod 420 is weaker than the ability of the fourth movable contact piece 210f to resist elastic deformation due to the pulling force of the first push rod 410, so that when the contact portion 20 switches from the closed state to the disconnected state, the carrier end contact 260 corresponding to H2 only requires a small separating force provided by the second push rod 420 to achieve separation.

[0062] Assuming that the driving force provided by the coil assembly 310 remains constant, the carrier end contacts 260 corresponding to H4 and H2 require a smaller breaking force. This reduces the breaking driving force acting on the arc-resistant end contact 250 corresponding to H3 at the lower end of the second push rod 420 and the arc-resistant end contact 250 corresponding to H1 at the upper end of the first push rod 410. This increases the breaking force required to separate the two arc-resistant end contacts 250, ensuring reliable separation under the action of a larger breaking force. As a result, the breaking force of the carrier end contact 260 is reduced while the breaking force of the arc-resistant end contact 250 is increased, reducing necessary energy loss. The relay of this embodiment of the present invention has the advantage of easily controlling the parameters of the arc-resistant end contact 250 without considering the parameters of the carrier end contact 260, thereby improving the reliability of the arc-resistant end contact 250's breaking.

[0063] Of course, it will be appreciated that embodiments having one, three, or any other number of contact portions 20 will similarly have the advantage of reducing the separating force of the carrier end contact while simultaneously increasing the separating force of the arc-resistant end contact, but this will not be discussed here.

[0064] 2, in the contact portion 20 located above the magnetic circuit portion 30, the movable contact unit 220 and the fixed contact unit 230 on the left side are defined as arc-resistant end contacts 250, and the movable contact unit 220 and the fixed contact unit 230 on the right side are defined as carrier end contacts 260. In the contact portion 20 located below the magnetic circuit portion 30, the movable contact unit 220 and the fixed contact unit 230 on the right side are defined as arc-resistant end contacts 250, and the movable contact unit 220 and the fixed contact unit 230 on the left side are defined as carrier end contacts 260.

[0065] That is, in this embodiment of the present invention, two arc-resistant end contacts 250 are located on one diagonal of the base 10, and two carrier end contacts 260 are located on the other diagonal of the base 10. Both ends of the first push rod 410 correspond to one carrier end contact 260 and one arc-resistant end contact 250, respectively, and both ends of the second push rod 420 correspond to one arc-resistant end contact 250 and one carrier end contact 260, respectively. That is, the two sets of contact portions 20 are arranged symmetrically around the center. This allows parts to be shared between the two sets of contact portions 20, facilitating automated production. It also reduces the number of assembly steps during production, thereby reducing the incidence of assembly errors and increasing the product yield rate.

[0066] 4 and 7, the thickness of the first movable contact piece 210c is smaller than the thickness of the second movable contact piece 210d. If other variables such as the material and length of the two movable contact pieces 210 remain unchanged, the rigidity of the first movable contact piece 210c and the second movable contact piece 210d can be changed simply by changing the thickness of the first movable contact piece 210c and the second movable contact piece 210d.

[0067] Furthermore, both the first movable contact piece 210c and the second movable contact piece 210d include a plurality of stacked sub-contact pieces 211. By designing both of the two movable contact pieces 210 to include a plurality of stacked sub-contact pieces 211, on the one hand, the thickness of the sub-contact pieces 211 is thin and the movable contact piece 210 can be made of a thin tape material with low material costs, and on the other hand, by increasing or decreasing the number of sub-contact pieces 211, the thickness of the movable contact piece 210 can be changed, and therefore the rigidity of the two movable contact pieces 210 can be changed, making operation easier.

[0068] As an example, the first movable contact piece 210c includes four sub-contact pieces 211, and the second movable contact piece 210d includes five sub-contact pieces 211, but is not limited thereto.

[0069] It can be seen that the thickness of the third movable contact piece 210e is smaller than that of the fourth movable contact piece 210f. The design of the third movable contact piece 210e and the fourth movable contact piece 210f can refer to the design of the first movable contact piece 210c and the second movable contact piece 210d, and will not be repeated here.

[0070] 5 and 6, the movable contact unit 220 includes one or more movable contacts 221, the fixed contact unit 230 includes one or more fixed contacts 231, the corresponding movable contacts 221 and fixed contacts 231 form a contact set, the arc-resistant end contacts 250 include one or more contact sets, and the carrier end contacts 260 include one or more contact sets. The number of contact sets of the arc-resistant end contacts 250 is less than or equal to the number of contact sets of the carrier end contacts 260.

[0071] In this embodiment, both the arc-resistant end contact 250 and the carrier end contact 260 can be configured to include multiple contact sets, thereby further reducing the temperature rise of the relay through the parallel structure formed by the multiple contact sets. Furthermore, because the carrier end contact 260 functions as a carrier and the arc-resistant end contact 250 functions as an arc-resistant contact, the number of contact sets in the arc-resistant end contact 250 is designed to be smaller than or equal to the number of contact sets in the carrier end contact 260. This not only reduces the temperature rise by increasing the number of contact sets in the carrier end contact 260, but also benefits the management of contact parameters by controlling the number of contact sets in the arc-resistant end contact 250. Finally, the management of contact parameters is not affected when the number of contact sets is increased.

[0072] 5 and 6, in the embodiment of the present invention, the contact portion 20 includes three contact sets, where the number of contact sets of the arc-resistant end contacts 250 is one and the number of contact sets of the carrier end contacts 260 is two. The two contact sets of the carrier end contacts 260 are arranged in parallel along the width direction D2 of the movable contact piece 210.

[0073] 6, a slit 214 is formed along the width direction D2 of the movable contact piece 210 in a portion located between two adjacent movable contacts 221 on the movable contact piece 210. Furthermore, along the length direction D1 of the movable contact piece 210, one end of the slit 214 penetrates the end face 213 of the movable contact piece 210, and the other end extends to the fixed contact 231 on the movable contact piece 210.

[0074] In this embodiment, by providing slits 214 in the movable contact piece 210, the movable contact piece 210 is divided into a plurality of carrier bodies 212 by the slits 214, and a plurality of movable contacts 221 on the movable contact piece 210 are provided in one-to-one correspondence with the plurality of carrier bodies 212. In this way, the plurality of movable contacts 221 on the movable contact piece 210 can move relatively independently and can reliably come into contact with the fixed contacts 231, avoiding a situation where some of the movable contacts 221 on the movable contact piece 210 are already in contact with the fixed contacts 231 while other portions of the movable contacts 221 are not in contact with the fixed contacts 231, thereby improving the reliability of contact of the contacts.

[0075] Of course, in other embodiments, the slit 214 may not be provided on the movable contact piece 210 .

[0076] The movable contact 221 and the fixed contact 231 are provided on the movable contact piece 210. It can be understood that the movable contact 221 may be connected to the movable contact piece 210 either integrally or separately, and the fixed contact 231 may also be connected to the movable contact piece 210 either integrally or separately.

[0077] When the movable contact 221 and the fixed contact 231 are connected to the movable contact piece 210 as separate bodies, the connection method may be crimping, but is not limited to this.

[0078] Of course, in other embodiments, the movable contact 210 may be a single piece rather than a plurality of stacked sub-contacts 211 .

[0079] The arc-resistant end contacts have fewer contact sets, allowing each contact to be designed with a larger volume, and the silver layer on the contacts has better flame resistance, improving contact durability. The arc-resistant end contacts also have fewer contact sets, making it easier to measure contact parameters. The carrier end contacts have more contact sets, forming a multi-contact parallel structure that reduces temperature rise.

[0080] As shown in Figures 8 to 10, the contact portion 20 of the second embodiment has a similar basic structure to the contact portion 20 of the first embodiment. Therefore, in the following description of the contact portion 20 of the second embodiment, the structure already described in the first embodiment will not be repeated. Note that the same reference numerals are used to designate the same components as those of the contact portion 20 described in the first embodiment. Therefore, the following description of this embodiment will focus on the differences from the contact portion 20 of the first embodiment.

[0081] In the embodiment of the present invention, the contact portion 20 includes four contact sets, where the number of contact sets of the arc-resistant end contacts 250 is two, and the number of contact sets of the carrier end contacts 260 is two. The two contact sets of the arc-resistant end contacts 250 and the two contact sets of the carrier end contacts 260 are both arranged along the width direction D2 of the movable contact piece 210.

[0082] The movable contact piece 210 may or may not have a slit 214 .

[0083] As shown in Figure 11, the contact portion 20 of the third embodiment has a similar basic structure to the contact portion 20 of the second embodiment. Therefore, in the following description of the contact portion 20 of the third embodiment, the structure already described in the second embodiment will not be repeated. Note that the same reference numerals are used to designate the same components as those of the contact portion 20 described in the second embodiment. Therefore, the following description of this embodiment will focus on the differences from the contact portion 20 of the second embodiment.

[0084] In the embodiment of the present invention, the contact portion 20 includes four contact sets, where the number of contact sets in the arc-resistant end contact 250 is one and the number of contact sets in the carrier end contact 260 is three. In the carrier end contact 260, the three contact sets are arranged in parallel along the width direction D2 of the movable contact piece 210.

[0085] The movable contact piece 210 may or may not have a slit 214 .

[0086] As shown in Fig. 12, the contact portion 20 of the fourth embodiment has a similar basic structure to the contact portion 20 of the first embodiment. Therefore, in the following description of the contact portion 20 of the fourth embodiment, the structure already described in the first embodiment will not be repeated. Note that the same reference numerals are used to designate the same components as those of the contact portion 20 described in the first embodiment. Therefore, the following description of this embodiment will focus on the differences from the contact portion 20 of the first embodiment.

[0087] In the present embodiment, the contact portion 20 includes five contact sets, where the number of contact sets of the arc-resistant end contacts 250 is two and the number of contact sets of the carrier end contacts 260 is three.

[0088] In the arc-resistant end contact 250, two contact sets are arranged in parallel along the width direction D2 of the movable contact piece 210. In the carrier end contact 260, three contact sets are arranged in parallel along the width direction D2 of the movable contact piece 210.

[0089] As shown in Fig. 13, the contact portion 20 of the fifth embodiment has a similar basic structure to the contact portion 20 of the first embodiment. Therefore, in the following description of the contact portion 20 of the fifth embodiment, the structure already described in the first embodiment will not be repeated. Note that the same reference numerals are used to designate the same components as those of the contact portion 20 described in the first embodiment. Therefore, the following description of this embodiment will focus on the differences from the contact portion 20 of the first embodiment.

[0090] In this embodiment, when the contact portion 20 is in the closed state, the movable contact piece 210, which has low rigidity, is deformed by the action of the first push rod 410 or the second push rod 420 and has an elastic force, which causes the movable contact piece 210 to tend to move to the disconnected state of the contact.

[0091] 2 and 13, the first movable contact piece 210c is deformed by the pulling of the first push rod 410 and has an elastic force F. When the contact portion 20 switches from the closed state to the open state, the elastic force F causes the first movable contact piece 210c to move in a direction away from the second movable contact piece 210d. In this way, under the action of the elastic force F, the separating force of the first push rod 410 to separate the carrier end contact 260 becomes smaller, and therefore the separating force of the second push rod 420 to separate the arc-proof end contact 250 becomes larger, which is helpful for timely separation of the arc-proof end contact 250.

[0092] It should be noted that the various embodiments / exemplary embodiments provided by the present invention can be combined with each other without causing any contradiction, and therefore, the description thereof will be omitted here.

[0093] In the embodiments of the invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. The term "plurality" means two or more than two, unless otherwise limited. Terms such as "attached," "contact," "connected," and "fixed" should be understood broadly. For example, "connected" may mean a fixed connection, a detachable connection, or an integral connection. "Contacted" may mean a direct connection or an indirect connection via an intermediate medium. The specific meanings of the above terms in the embodiments of the present invention can be understood by those skilled in the art depending on the specific circumstances.

[0094] In describing the embodiments of the present invention, the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "front," and "rear" are orientations or positional relationships based on the drawings and are intended merely to facilitate the description and simplification of the embodiments of the present invention, and are not to be understood as limitations on the embodiments of the invention, as they do not indicate or imply that the indicated devices or units are required to have a particular orientation or be configured and operate in a particular orientation.

[0095] In the description herein, the terms "one embodiment," "some embodiments," "particular embodiment," etc., mean that the particular feature, structure, material, or characteristic described in connection with this embodiment or example is included in at least one embodiment or example of the invention. In this specification, general references to the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0096] The above is only a preferred embodiment of the invention, and is not used to limit the invention, and those skilled in the art can make various modifications and changes to the invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. A relay including a base, a contact portion, a push rod assembly, and a magnetic circuit portion, the contact portion is provided on the base and includes two sets of movable contact portions, each set of the movable contact portions includes a movable contact piece, a movable contact unit, and a fixed contact unit, the movable contact unit is provided on the movable contact piece, the two movable contact units of the contact portion correspond to the two fixed contact units respectively, and the rigidities of the two movable contact pieces are different; the push rod assembly includes a first push rod and a second push rod, the first push rod and the second push rod being connected to two of the movable contact pieces, respectively; The magnetic circuit portion is provided on the base and is used to drive the first push rod and the second push rod to move in opposite directions, driving the two movable contact pieces to approach or move away from each other, thereby realizing contact or separation between the fixed contact unit and the movable contact unit. A relay characterized by:

2. When the contact portions are in a disconnected state, a contact gap between the corresponding movable contact unit and the fixed contact unit of one set is smaller than a contact gap between the corresponding movable contact unit and the fixed contact unit of the other set, and the movable contact unit and the fixed contact unit of one set with a smaller contact gap are defined as arc-resistant end contacts, and the movable contact unit and the fixed contact unit of the other set with a larger contact gap are defined as carrier end contacts; The movable contact piece of the movable contact unit corresponding to the carrier end contact is defined as a first movable contact piece, the movable contact piece of the movable contact unit corresponding to the arc-resistant end contact is defined as a second movable contact piece, the first push rod is connected with the first movable contact piece, and the second push rod is connected with the second movable contact piece; The rigidity of the first movable contact piece is smaller than the rigidity of the second movable contact piece.

2. The relay according to claim 1.

3. The thickness of the first movable contact piece is smaller than the thickness of the second movable contact piece.

3. The relay according to claim 2.

4. The first movable contact piece and the second movable contact piece each include a plurality of stacked sub-contact pieces, The number of the sub-contact pieces of the first movable contact piece is less than the number of the sub-contact pieces of the second movable contact piece.

4. The relay according to claim 3.

5. the movable contact unit includes one or more movable contacts, the fixed contact unit includes one or more fixed contacts, the corresponding movable contacts and the corresponding fixed contacts form a contact set, the arc-resistant end contacts include one or more of the contact sets, and the carrier end contacts include one or more of the contact sets; The number of the contact sets of the arc-resistant end contacts is less than or equal to the number of the contact sets of the carrier end contacts.

3. The relay according to claim 2.

6. The arc-resistant end contacts include one or two of the contact sets, The carrier end contacts include two or three sets of the contact sets.

6. The relay according to claim 5.

7. The arc-resistant end contact includes two contact sets, and the two contact sets are arranged side by side along the width direction of the movable contact portion, The carrier end contacts include two or three contact sets, and the two or three contact sets are arranged in parallel along the width direction of the movable contact portion.

6. The relay according to claim 5.

8. A slit is formed along the width direction of the movable contact piece at a portion located between two adjacent movable contacts of the movable contact piece.

6. The relay according to claim 5.

9. Along the length of the movable contact piece, one end of the slit penetrates the end face of the movable contact piece, and the other end extends to the fixed contact of the movable contact piece.

9. The relay according to claim 8.

10. The movable contact portion of each set further includes a movable contact lead piece, and the movable contact lead piece is connected to the movable contact piece; The fixed contact unit is provided at a connection point between the movable contact piece and the movable contact lead piece.

2. The relay according to claim 1.

11. The movable contact piece has a first end and a second end opposite to each other in a longitudinal direction thereof, the movable contact unit is provided at the first end, and the second end is connected to the movable contact lead piece; The first push rod and the second push rod are respectively connected to the first ends of the two movable contact pieces.

11. The relay according to claim 10.

12. the magnetic circuit portion includes a coil assembly and an armature assembly, the armature assembly is swingably connected to the base, and the armature assemblies are connected to the first push rod and the second push rod, respectively, and the coil assembly is used to drive the armature assembly to swing; The first push rod and the second push rod are located on opposite sides of the armature assembly, respectively.

2. The relay according to claim 1.

13. When the contact portion is in a closed state, the movable contact piece, which has low rigidity, is deformed by the action of the first push rod or the second push rod and has an elastic force, and the elastic force causes the movable contact piece to tend to move toward a contact-breaking state.

2. The relay according to claim 1.

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