High-power double-contact relay

Abstract

The utility model discloses a high-power double-contact relay, which comprises a pushing mechanism, a shell, two static contacts and a movable contact assembly, the shell is a hollow shell, the pushing mechanism is arranged in the shell, the movable contact assembly comprises a first push plate, a second push plate, a connecting pin and a push rod, the second push plate and the first push plate are both made of conductive materials, and the second push plate and the first push plate are both made of conductive materials. A second movable contact is arranged on the top surface of the second push plate, two first positioning bosses are arranged on the edge of the first push plate at intervals, the second positioning boss can be clamped between the two first positioning bosses and is attached to the first positioning bosses, the top end of the push rod penetrates through the connecting hole, a second pin hole is formed in the second positioning boss in the horizontal direction in a penetrating mode, and a second movable contact is arranged on the second pin hole. The first pin hole, the second pin hole and the third pin hole are coaxial, the connecting pin penetrates through the first pin hole, the second pin hole and the third pin hole and is in clearance fit with the first pin hole and the second pin hole, and the push rod is in clearance fit with the connecting hole. The contact provided by the utility model has a good contact joint effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to a relay, especially a high-power double-contact relay. BACKGROUND

[0002] High-voltage direct-current relay (HVDC) is one of the key components for pure electric vehicles, and the working voltage of the direct-current relay of the electric vehicle is 800-1000V, or even 1500V. Since the power of the electric vehicle is large, the instantaneous current is also large when the moving contact and the static contact of the relay are in contact. The existing relay is usually designed with double contacts, and the two static contacts have a certain height difference due to the tolerance in the assembly process. The height difference of the static contact can easily cause poor contact of the contact on one side when the moving contact and the static contact are in contact. The part with poor contact has a small contact area, which can cause the resistance between the moving contact and the static contact to increase when they are connected. In a high-power relay, the above problems can cause local high temperature of the contact, and the local high temperature can cause the contact to melt, which adversely affects the reliability of the relay. SUMMARY

[0003] In order to overcome the above defects, the utility model provides a high-power double-contact relay, which has the advantages of good contact joint effect.

[0004] The utility model discloses a high-power double-contact relay, which has the advantages of good contact joint effect. The utility model discloses a high-power double-contact relay, which has the advantages of good contact joint effect.

[0005] As optional, the pushing mechanism comprises a coil, a magnetic guide cylinder, a moving iron core, a yoke plate and a connecting rod, the magnetic guide cylinder is arranged in the inner circle of the coil, the yoke plate is arranged above the coil, the moving iron core is slidably connected to the magnetic guide cylinder, the bottom end of the connecting rod is connected to the shaft of the moving iron core, the connecting rod is slidably arranged in the yoke plate, and the push rod is elastically connected with the connecting rod through the main spring.

[0006] As optional, two reset tension springs are further included, the top of the yoke plate is covered with an insulating plate, two hanging points are arranged on the insulating plate, the bottom end of the reset tension spring is connected to the hanging point, and the top end of the reset tension spring is connected to the end of the connecting pin.

[0007] As optional, the connecting pin and the third pin hole are in interference fit.

[0008] As optional, the static contact point is arranged on the inner wall of the top end of the shell, and a wiring mechanism electrically connected with the static contact point is arranged outside the shell.

[0009] As optional, the thickness of the first positioning boss is greater than the thickness of the first push plate, the thickness of the second positioning boss is greater than the thickness of the second push plate, and the second push plate and the first push plate are both made of copper alloy.

[0010] The beneficial technical effects of the utility model are: the high-power double-contact relay comprises a pushing mechanism, a shell, two static contact points and a moving contact point assembly, in use, the pushing mechanism drives the moving contact point assembly to move upward, the first push plate and the connecting pin are not completely fixed, the first push plate can swing around the connecting pin when contacting the static contact point, the second push plate and the connecting pin are also not completely fixed, so the second push plate can also swing around the connecting pin when contacting the static contact point, the push rod does not affect the swing of the second push plate, the swing of the first push plate and the second push plate eliminates the height difference of the two static contact points caused by tolerance, the two static contact points and the first moving contact point and the second moving contact point can be well engaged, the damage of the contact points caused by poor engagement is reduced, and the engagement effect of the contact points is better. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is the perspective view of the whole machine of the utility model;

[0012] Figure 2 is the front view of the moving contact point assembly of the utility model;

[0013] Figure 3 is the perspective view of the moving contact point assembly of the utility model;

[0014] Figure 4is a perspective exploded view of the movable contact assembly of the utility model;

[0015] Figure 5 is a swing schematic view of the first push plate and the second push plate of the utility model;

[0016] Figure 6 is a swing schematic view of the first push plate and the second push plate of the utility model;

[0017] Among them:

[0018] 1, push mechanism;2, shell;3, static contact;4, first push plate;5, second push plate;

[0019] 6, connecting pin;7, push rod;8, first movable contact;9, second movable contact;10, first positioning boss;11, second positioning boss;12, connecting hole;13, first pin hole;14, second pin hole;15, third pin hole;16, main spring;17, reset tension spring. Specific embodiments

[0020] In order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following specific embodiments of the utility model are further described in detail, the following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0021] The specific embodiment of the application in detail records the high-power double-contact relay described in the application, such as Figures 1-6As shown, the high-power double-contact relay comprises a pushing mechanism 1, a shell 2, two static contacts 3 and a moving contact assembly, the shell 2 is a hollow shell, the pushing mechanism 1 is arranged in the shell 2, the moving contact assembly comprises a first push plate 4, a second push plate 5, a connecting pin 6 and a push rod 7, the second push plate 5 and the first push plate 4 are both made of conductive material, the top surface of the second push plate 5 is provided with a second moving contact 9, the top surface of the first push plate 4 is provided with a first moving contact 8, the upper side of the second moving contact 9 and the first moving contact 8 is provided with a static contact 3, the edge of the first push plate 4 is provided with two first positioning bosses 10 at intervals, the edge of the second push plate 5 is provided with a second positioning boss 11, the second positioning boss 11 can be clamped between the two first positioning bosses 10 and fit with the first positioning bosses 10, the second positioning boss 11 is provided with a connecting hole 12 penetratingly opened along the vertical direction, the top end of the push rod 7 is arranged in the connecting hole 12, the first positioning boss 10 is provided with a first pin hole 13 penetratingly opened along the horizontal direction, the second positioning boss 11 is provided with a second pin hole 14 penetratingly opened along the horizontal direction, the side wall of the push rod 7 is provided with a third pin hole 15 penetratingly opened along the horizontal direction, the first pin hole 13, the second pin hole 14 and the third pin hole 15 are coaxial, the connecting pin 6 is arranged in the first pin hole 13, the second pin hole 14 and the third pin hole 15, the connecting pin 6 is in clearance fit with the first pin hole 13 and the second pin hole 14, the push rod 7 is in clearance fit with the connecting hole 12, the bottom end of the push rod 7 is connected with the moving end of the pushing mechanism 1, the moving contact assembly can move upward along the vertical direction under the driving of the pushing mechanism 1, the second moving contact 9 and the first moving contact 8 can contact the static contact 3. In use, the pushing mechanism drives the moving contact assembly to move upward, because the connecting pin 6 is in clearance fit with the first pin hole 13 and the second pin hole 14, and the push rod 7 is in clearance fit with the connecting hole 12, so the first push plate 4 and the connecting pin 6 are not completely fixed, the first push plate 4 can swing around the connecting pin 6 when contacting the static contact 3, and the second push plate 5 and the connecting pin 6 are also not completely fixed, so the second push plate 5 can also swing around the connecting pin 6 when contacting the static contact 3, in addition, because the push rod 7 and the connecting hole 12 are also not completely fixed, so the push rod 7 will not affect the swing of the second push plate 5, the swing of the first push plate 4 and the second push plate 5 can eliminate the height difference of the two static contacts 3 caused by tolerance, so that the two static contacts 3 and the first moving contact 8 and the second moving contact 9 can be well engaged when they are engaged, reducing the damage of the contacts caused by poor engagement, the contact engagement effect of the present application is better.

[0022] Optionally, the pushing mechanism 1 comprises a coil, a magnetic guide cylinder, a moving iron core, a yoke plate and a connecting rod. The magnetic guide cylinder is arranged in the inner circle of the coil. The yoke plate is arranged above the coil. The moving iron core is slidably connected to the magnetic guide cylinder. The bottom end of the connecting rod is connected to the shaft of the moving iron core. The connecting rod is slidably arranged in the yoke plate. The pushing rod 7 is elastically connected to the connecting rod through the main spring 16. When the first moving contact 8 and the second moving contact 9 contact the static contact 3, the main spring 16 is compressed and provides a buffer to avoid excessive impact when contacting.

[0023] Optionally, the embodiment further comprises two reset tension springs 17. The top of the yoke plate is covered with an insulating plate. Two hanging points are arranged on the insulating plate. The bottom end of the reset tension spring 17 is connected to the hanging point. The top end of the reset tension spring 17 is connected to the end of the connecting pin 6. When the pushing mechanism 1 drives the moving contact assembly to move upward, the reset tension spring 17 is stretched. When the moving contact assembly needs to be reset, the reset tension spring 17 resets the moving contact assembly through the elastic force.

[0024] Optionally, the connecting pin 6 and the third pin hole 15 are in interference fit.

[0025] Optionally, the static contact 3 is arranged on the inner wall of the top end of the shell 2. The shell 2 is externally provided with a wiring mechanism electrically connected to the static contact 3.

[0026] Optionally, the thickness of the first positioning boss 10 is greater than the thickness of the first push plate 4. The thickness of the second positioning boss 11 is greater than the thickness of the second push plate 5. The second push plate 5 and the first push plate 4 are both made of copper alloy. The thicker first positioning boss 10 and the second positioning boss 11 can increase the cross-sectional area of the electrically conductive surface when they are in close contact, thereby preventing the temperature of the contact surface from rising due to excessive resistance. Meanwhile, the thicker second positioning boss 11 is also convenient for arranging the pushing rod 7 and the connecting pin 6.

[0027] Optionally, the contact surface between the first positioning boss 10 and the second positioning boss 11, the contact surface between the first positioning boss 10 and the second push plate 5, and the contact surface between the second positioning boss 11 and the first push plate 4 are all flat surfaces. It should be noted that when the first push plate 4 and the second push plate 5 swing to a certain angle, interference will occur between the first positioning boss 10 and the second push plate 5, and between the second positioning boss 11 and the first push plate 4. The above interference phenomenon can limit the excessive swing of the first push plate 4 and the second push plate 5, thereby playing a limiting role. If the swing amplitude of the first push plate 4 and the second push plate 5 is too small due to the above interference phenomenon, affecting the engagement with the static contact 3, the user can simulate and calculate the interference part through computer software, and remove the material of the corresponding interference part during mass production according to the needs, so as to meet the use requirements. Alternatively, the above method can be used to fine-tune according to the tolerance of different batches of static contacts 3.

[0028] In some alternative embodiments, the push rod 7 is made of insulating material, and the top end of the reset tension spring 17 is connected to the end of the connecting pin 6 by welding.

[0029] The high-power double-contact relay in the embodiment has the advantage of good contact engagement effect.

Claims

1. A high power double contact relay, characterized by, The utility model relates to a contactor, including: Pushing mechanism (1), shell (2), two static contacts (3) and moving contact assembly, shell (2) is hollow casing, pushing mechanism (1) is arranged in shell (2), moving contact assembly includes first push plate (4), second push plate (5), connecting pin (6) and push rod (7), second push plate (5) and first push plate (4) are all made of conductive material, the top of second push plate (5) is provided with second moving contact (9), the top of first push plate (4) is provided with first moving contact (8), the just above of second moving contact (9) and first moving contact (8) is provided with a static contact (3), the edge of first push plate (4) is provided with two first positioning boss (10) at intervals, the edge of second push plate (5) is provided with second positioning boss (11), second positioning boss (11) can be clamped between two first positioning boss (10) and is attached with first positioning boss (10), second positioning boss (11) is opened along vertical direction and is provided with connecting hole (12), the top end of push rod (7) is worn in connecting hole (12), every first positioning boss (10) is opened along horizontal direction and is provided with first pinhole (13), second positioning boss (11) is opened along horizontal direction and is provided with second pinhole (14), the lateral wall of push rod (7) is opened along horizontal direction and is provided with third pinhole (15), two first pinhole (13), second pinhole (14) and third pinhole (15) are coaxial, connecting pin (6) is worn in first pinhole (13), second pinhole (14) and third pinhole (15), connecting pin (6) is in clearance fit with first pinhole (13), second pinhole (14), push rod (7) is in clearance fit with connecting hole (12), the bottom end of push rod (7) is connected with the moving end of pushing mechanism (1), moving contact assembly can be driven along vertical direction and is moved upwards under the drive of pushing mechanism (1), and second moving contact (9) and first moving contact (8) can contact static contact (3).

2. A high power double contact relay according to claim 1, characterized in that: The pushing mechanism (1) includes a coil, a magnetic guide cylinder, a moving iron core, a yoke plate, and a connecting rod. The magnetic guide cylinder is arranged in the inner circle of the coil. The yoke plate is arranged above the coil. The moving iron core is slidably connected to the magnetic guide cylinder. The bottom end of the connecting rod is connected to the axis of the moving iron core. The connecting rod is slidably arranged in the yoke plate. The push rod (7) is elastically connected to the connecting rod through a main spring (16).

3. A high power double contact relay according to claim 2, characterized in that: Two reset tension springs (17) are further included. The top of the yoke plate is covered with an insulating plate. Two hanging points are arranged on the insulating plate. The bottom end of the reset tension spring (17) is connected to the hanging point. The top end of the reset tension spring (17) is connected to the end of the connecting pin (6).

4. The high power double contact relay according to claim 1, characterized in that: The connecting pin (6) and the third pinhole (15) are in interference fit.

5. The high power double contact relay according to claim 1, characterized in that: The static contact (3) is arranged on the inner wall of the top end of the shell (2). A wiring mechanism electrically connected to the static contact (3) is arranged outside the shell (2).

6. The high power double contact relay according to claim 1, characterized in that: The thickness of the first positioning boss (10) is greater than the thickness of the first push plate (4). The thickness of the second positioning boss (11) is greater than the thickness of the second push plate (5). The second push plate (5) and the first push plate (4) are both made of copper alloy.

Images