relay

Abstract

The present invention provides a relay, comprising: an anti-adhesion fixed contact conductively connected to a fixed contact and an anti-adhesion movable contact conductively connected to a movable contact; the anti-adhesion movable contact is used to slide and conductively connect the anti-adhesion fixed contact when the movable contact moves toward the fixed contact, so that the resistance of the connection position of the anti-adhesion fixed contact and the anti-adhesion movable contact is continuously reduced; the branch resistance formed by the connection of the anti-adhesion fixed contact and the anti-adhesion movable contact is close to or greater than the branch resistance formed by the contact between the movable contact and the fixed contact; the anti-adhesion movable contact is also used to slide and conductively connect the anti-adhesion fixed contact when the movable contact and the fixed contact are disconnected, so that the resistance between the connection position of the anti-adhesion fixed contact and the connection position of the anti-adhesion movable contact is continuously increased until the movable contact is reset and the anti-adhesion fixed contact and the anti-adhesion movable contact are disconnected. The above relay can avoid contact adhesion during the closing process and contact ablation during the disconnection process, and can reduce the volume and cost of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic control devices, and in particular to a relay. Background Art

[0002] like Figure 1 As shown, the currently commonly used high-voltage relay mainly consists of a first fixed contact 1, a second fixed contact 2, a moving contact 3, a moving contact push rod 4, a relay drive coil 5 and a relay housing 6. When the relay starts working, the relay driving coil 5 is energized to generate magnetic force, pushing the moving contact push rod 4 to move upward, and the moving contact 3 contacts the first fixed contact 1 and the second fixed contact 2 at the same time, thereby connecting the first fixed contact 1 and the second fixed contact 2; but in the process of the moving contact 3 contacting the first fixed contact 1 and the second fixed contact 2, the distance between the moving contact 3 and the first fixed contact 1 and the second fixed contact 2 is small enough, and breakdown arcing will occur between the first fixed contact 1 and the moving contact 3 and between the second fixed contact 2 and the moving contact 3; and after the moving contact 3 collides with the first fixed contact 1 and the second fixed contact 2, the moving contact 3 will rebound backward, causing the moving contact 3 of the relay to be disconnected from the first fixed contact 1 and the second fixed contact 2 again, resulting in arcing; then the moving contact 3 contacts the first fixed contact 1 and the second fixed contact 2 again, and when the distance between the moving contact 3 and the first fixed contact 1 and the second fixed contact 2 is small enough, breakdown arcing will occur between the contacts again. These arcing phenomena that occur during the relay closing process generate a lot of heat. When the heat reaches a certain level, it will melt the metal surfaces of the first fixed contact 1, the second fixed contact 2, and the movable contact 3. This will then cause adhesion between the movable contact 3 and the first fixed contact 1, and between the movable contact 3 and the second fixed contact 2 after the relay is closed, causing the relay to be unable to disconnect automatically and fail. When the relay ends its operation, after the relay drive coil 5 is energized and disconnected, the magnetic force of the relay drive coil 5 disappears, the movable contact push rod 4 moves downward and resets, and the movable contact 3 is disconnected from the first fixed contact 1 and the second fixed contact 2. When the movable contact 3 is just disconnected from the first fixed contact 1 and the second fixed contact 2, arcing will occur between the first fixed contact 1 and the movable contact 3, and between the second fixed contact 2 and the movable contact 3. If the arcing cannot be eliminated quickly, the heat generated by the arcing will melt the contact surface, resulting in uneven contact surface and accelerating relay failure. Therefore, the load-absorbing ability of ordinary high-voltage relays is relatively weak.

[0003] In the application of relays in new energy vehicles, there are large-capacity filter capacitors on the input terminals of motor controllers, DCDCs, etc. on the power cable busbar of the vehicle. This capacitive load needs to charge the capacitor at the moment of power-on. Therefore, when the relay is closed, the current flowing through the relay will be very large. As a result, arcs are drawn between the moving contact and the fixed contact multiple times during the closing process, which makes it very easy for the relay contacts to stick. In order to solve this problem, the currently commonly used solutions are as follows: Figure 2 As shown, a pre-charge relay and a pre-charge resistor are added. When the main circuit relay is closed, the pre-charge relay is closed first to fully charge the external load capacitor, and then the main circuit relay is closed. This prevents the main circuit relay from closing with a heavy load, thereby preventing the main circuit relay from sticking. However, this solution adds a pre-charge relay and a pre-charge resistor, which increases the system size and cost. Summary of the Invention

[0004] In view of this, the present invention provides a relay to prevent adhesion during the closing process and ablation during the opening process of the relay, and to reduce volume and cost.

[0005] In order to achieve the above object, the present invention adopts the following scheme:

[0006] According to one aspect of an embodiment of the present invention, there is provided a relay, comprising: a fixed contact body, a movable contact body, an anti-adhesion fixed contact, and an anti-adhesion movable contact;

[0007] The anti-adhesion fixed contact is conductively connected to the fixed contact body; the anti-adhesion movable contact is conductively connected to the movable contact body;

[0008] Wherein, the anti-sticking movable contact is used to slide and conductively connect the anti-sticking fixed contact during the process of the movable contact body moving toward the fixed contact body, so that the resistance between the connection position between the fixed contact body and the anti-sticking fixed contact and the connection position between the movable contact body and the anti-sticking movable contact continuously decreases until the movable contact body and the fixed contact body contact and close and conduct; the resistance of the branch formed by the connection of the anti-sticking fixed contact and the anti-sticking movable contact is close to or greater than the resistance of the branch formed by the contact between the movable contact body and the fixed contact body;

[0009] The anti-sticking movable contact is also used to slide and conductively connect the anti-sticking fixed contact during the process when the moving contact body and the fixed contact body are disconnected and the moving contact body moves away from the fixed contact body, so that the resistance between the connection position between the fixed contact body and the anti-sticking fixed contact and the connection position between the moving contact body and the anti-sticking movable contact continues to increase, thereby gradually reducing the current flowing through the relay, and reducing the current value when the anti-sticking movable contact and the anti-sticking fixed contact are disconnected, until the moving contact body is reset, and the anti-sticking fixed contact and the anti-sticking movable contact are disconnected, thereby avoiding arc erosion between the fixed contact and the moving contact of the relay.

[0010] In some embodiments, the anti-adhesion fixed contact is fixedly connected to the fixed contact body; the anti-adhesion movable contact is fixedly connected to the movable contact body;

[0011] One end of the anti-adhesion fixed contact is fixedly connected to the fixed contact body, and the other end extends to a position close to the moving contact body where the anti-adhesion moving contact is located when the moving contact body is in a reset state; the shape between the two ends of the anti-adhesion fixed contact matches the sliding trajectory of the anti-adhesion moving contact, so that the anti-adhesion fixed contact and the anti-adhesion moving contact are slidably connected during the movement of the moving contact body.

[0012] In some embodiments, the sliding connection between the anti-sticking fixed contact and the anti-sticking movable contact is a smooth sliding connection.

[0013] In some embodiments, the anti-adhesion fixed contact is fixedly connected to and protrudes from a side surface of the fixed contact body; the anti-adhesion fixed contact is L-shaped with one end connected to the fixed contact body and the other end close to the anti-adhesion movable contact.

[0014] In some embodiments, when the anti-adhesion interlocking contact slides and conductively connects to the anti-adhesion fixed contact, elastic extrusion contact is formed between the anti-adhesion interlocking contact and the anti-adhesion fixed contact.

[0015] In some embodiments, the anti-adhesion fixed contact and the anti-adhesion movable contact are both made of conductive materials, and at least one of the conductive materials is an elastic material.

[0016] In some embodiments, the anti-adhesion fixed contact is made of at least one conductive material having a resistivity not lower than that of copper.

[0017] In some embodiments, when the anti-adhesion fixed contact is made of a plurality of conductive materials having a resistivity not lower than that of copper, the resistivity of the conductive material of the anti-adhesion fixed contact from one end close to the anti-adhesion movable contact to the end connected to the fixed contact body decreases one by one as the conductive material changes.

[0018] In some embodiments, the conductive material of the anti-adhesion fixed contact includes one or more of pure metal, metal alloy, and graphite; and / or the anti-adhesion movable contact is made of graphite material.

[0019] In some embodiments, the relay further comprises: a movable contact push rod and a drive coil; the movable contact push rod is connected to the movable contact body and is used to push the movable contact body toward the fixed contact body under the action of the electromagnetic force provided by the drive coil;

[0020] The relay includes the first fixed contact body, the second fixed contact body, the movable contact body, the first anti-adhesion fixed contact, the second anti-adhesion fixed contact, the first anti-adhesion linked movable contact, and the second anti-adhesion linked movable contact;

[0021] The first anti-adhesion movable contact is used to slide and conductively connect the first anti-adhesion fixed contact during the movement of the movable contact body toward the first fixed contact body, so that the resistance between the connection position between the first fixed contact body and the first anti-adhesion fixed contact and the connection position between the movable contact body and the first anti-adhesion movable contact continuously decreases until the movable contact body and the first fixed contact body are in contact and closed;

[0022] The first anti-adhesion linked movable contact is further configured to slide and conductively connect the first anti-adhesion fixed contact during a process in which the movable contact body and the first fixed contact body are disconnected and the movable contact body moves away from the first fixed contact body, so that the resistance between the connection position between the first fixed contact body and the first anti-adhesion fixed contact and the connection position between the movable contact body and the first anti-adhesion linked movable contact continuously increases until the movable contact body is reset and the first anti-adhesion fixed contact and the first anti-adhesion linked movable contact are disconnected;

[0023] The second anti-adhesion movable contact is used to slide and conductively connect the second anti-adhesion fixed contact during the movement of the movable contact body toward the second fixed contact body, so that the resistance between the connection position between the second fixed contact body and the second anti-adhesion fixed contact and the connection position between the movable contact body and the second anti-adhesion movable contact continuously decreases until the movable contact body and the second fixed contact body contact and close the connection;

[0024] The resistance of a branch formed by the first anti-adhesion fixed contact, the first anti-adhesion linked movable contact, the second anti-adhesion fixed contact, and the second anti-adhesion linked movable contact is close to or greater than the resistance of a branch formed by the movable contact body, the first fixed contact body, and the second fixed contact body;

[0025] The second anti-adhesion linked movable contact is also used to slide and conductively connect the second anti-adhesion fixed contact during the process of the movable contact body and the second fixed contact body being disconnected and the movable contact body moving away from the second fixed contact body, so that the resistance between the connection position between the second fixed contact body and the second anti-adhesion fixed contact and the connection position between the movable contact body and the second anti-adhesion linked movable contact continues to increase until the movable contact body is reset and the second anti-adhesion fixed contact and the second anti-adhesion linked movable contact are disconnected.

[0026] The relay of the embodiment of the present invention adds an anti-sticking moving contact and an anti-sticking fixed contact on the basis of the moving contact body and the fixed contact body, and in the process of relay closing, the anti-sticking moving contact and the anti-sticking fixed contact with larger connection resistance are closed first, forming a high-resistance path, which can be used for pre-charging, and the moving contact body and the fixed contact body are closed later, playing the role of relay pre-closing. In the process of relay disconnection, the moving contact body and the fixed contact body are disconnected first, and the anti-sticking moving contact and the anti-sticking fixed contact with larger connection resistance are disconnected later, gradually forming a high-resistance path, reducing the current value of the loop, avoiding arcing, and thus preventing adhesion when the relay is closed. Moreover, adding the anti-sticking moving contact and the anti-sticking fixed contact on the basis of the original moving contact and the fixed contact does not require additional pre-charging resistance and pre-charging relay, and almost does not increase the volume of the relay. Moreover, the cost is also relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 It is a structural diagram of an existing relay;

[0029] Figure 2 This is a circuit diagram of an existing high-voltage relay with a pre-charge relay and a pre-charge resistor;

[0030] Figure 3 1 is a schematic structural diagram of a relay according to an embodiment of the present invention;

[0031] Figure 4 This is a structural diagram of a relay in one embodiment of the present invention being closed or opened;

[0032] Figure 5 1 is a schematic structural diagram of a relay after closing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0034] It should be noted in advance that the descriptions of the following embodiments or examples or the features mentioned therein can be combined with the features of other embodiments or examples in the same or similar manner, or replace the features of other embodiments or examples to form possible implementations. In addition, the term "include / comprise" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence of one or more other features, elements, steps, or components.

[0035] Figure 3 1 is a schematic structural diagram of a relay according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of a relay in one embodiment of the present invention being closed or opened. Figure 5 FIG. 1 is a schematic diagram of the structure of a relay after closing according to an embodiment of the present invention. Figures 3 to 5 The relay of the embodiment of the present invention may include: a fixed contact body 111, a movable contact body 13, an anti-adhesion fixed contact 181, and an anti-adhesion movable contact 171.

[0036] Here, for the sake of convenience of description, the fixed contact body 111, the moving contact body 13, the anti-adhesion fixed contact 181 and the anti-adhesion moving contact 171 are used as examples for illustration. In other embodiments, the relay may further include a fixed contact body 112, an anti-adhesion fixed contact 182, and an anti-adhesion moving contact 172. Among them, the fixed contact bodies 111 and 112 can also be called fixed contacts, fixed contacts, static contacts or static contacts, and can be fixed contacts of existing relays; the moving contact body 13 can also be called a moving contact or moving contact, and can be a moving contact of an existing relay (such as a vertical relay). In addition, the relay of the embodiment of the present invention can be a high-voltage relay and can be used in a high-voltage system.

[0037] Furthermore, the anti-adhesion fixed contact 181 is conductively connected to the fixed contact body 111 ; and the anti-adhesion movable contact 171 is conductively connected to the movable contact body 13 .

[0038] Among them, see Figure 4 and Figure 5 The anti-adhesion movable contact 171 is used to slide and conductively connect the anti-adhesion fixed contact 181 during the movement of the movable contact body 13 toward the fixed contact body 111, so that the resistance between the connection position between the fixed contact body 111 and the anti-adhesion fixed contact 181 and the connection position between the movable contact body 13 and the anti-adhesion movable contact 171 continues to decrease until the movable contact body 13 and the fixed contact body 111 are in contact and closed.

[0039] In this way, during the relay closing process, that is, the process in which the moving contact body and the fixed contact body change from being separated to being in contact to close and conduct the relay, the anti-sticking moving contact and the fixed contact body first contact and conduct, and then the moving contact body and the fixed contact body contact and conduct.

[0040] Further, see Figure 4 and Figure 5 The resistance of branch circuit 190 formed by the connection between the anti-sticking fixed contacts 181, 182 and the anti-sticking movable contacts 171, 172 is close to or greater than the resistance of branch circuit 113 formed by the contact between the movable contact body 13 and the fixed contact bodies 111, 112. Branch circuit 190 and branch circuit 113 are connected in parallel. The resistance of branch circuit 113 formed by the connection between the movable contact body 13 and the fixed contact bodies 111, 112 is low, allowing for conduction.

[0041] Here, the “close” may mean that the resistance of the former branch 190 may be slightly larger or smaller than the resistance of the latter branch 113 , and the degree of slightly larger or smaller may be determined according to the degree to which the latter branch 113 can be turned on.

[0042] After the relay is closed, the resistance of the branch formed by the connection of the anti-sticking fixed contact and the anti-sticking moving contact is close to or greater than the resistance of the branch formed by the contact between the moving contact body and the fixed contact body. The resistance of the latter branch 113 will not be much greater than the resistance of the former branch 190, so that the moving contact body and the fixed contact body can be turned on after contact, that is, the relay is turned on. In addition, since the resistance between the connection position between the fixed contact body 111 and the anti-adhesion fixed contact 181 and the connection position between the moving contact body 13 and the anti-adhesion moving contact 171 continues to decrease during the movement of the moving contact body 13 toward the fixed contact body 111, and the resistance is reduced to a minimum value when the moving contact body 13 and the fixed contact body 111 are in contact, before the moving contact body 13 and the fixed contact body 111 are in contact, the resistance of the branch 190 formed by the connection of the anti-adhesion fixed contact 181 and the anti-adhesion moving contact 171 is relatively large. Therefore, in the process of closing the relay, the anti-adhesion fixed contact 181 and the anti-adhesion moving contact 171 are first contacted to form a high-resistance path, which can play the role of pre-closing the relay. Since the resistance is large, the current can be reduced to prevent large current shocks, thereby preventing adhesion when the relay is closed.

[0043] Further, see Figure 4 and Figure 5 The anti-adhesion movable contact 171 is also used to slide and conductively connect the anti-adhesion fixed contact 181 during the process when the movable contact body 13 and the fixed contact body 111 are disconnected and the movable contact body 13 moves away from the fixed contact body 111, so that the resistance between the connection position between the fixed contact body 111 and the anti-adhesion fixed contact 181 and the connection position between the movable contact body 13 and the anti-adhesion movable contact 171 continues to increase until the movable contact body 13 is reset and the anti-adhesion fixed contact 181 and the anti-adhesion movable contact 171 are disconnected.

[0044] The relay disconnection process can be the reverse process of the relay closing process. During the relay disconnection process, the moving contact body 13 and the fixed contact body 111 are disconnected first, and then the anti-adhesion fixed contact 181 and the anti-adhesion linked moving contact 171 are disconnected. Moreover, the resistance between the connection position between the fixed contact body 111 and the anti-adhesion fixed contact 181 and the connection position between the moving contact body 13 and the anti-adhesion linked moving contact 171 continues to increase, forming a high-resistance path. Therefore, the current in the path between the anti-adhesion fixed contact 181 and the anti-adhesion linked moving contact 171 will not disappear suddenly, but will gradually decrease due to the continuous increase in resistance. Therefore, arcing will not be generated to generate a large amount of heat, thereby preventing contact burning when the relay is disconnected.

[0045] In a specific implementation, the anti-adhesion fixed contact can be connected to the fixed contact body in a fixed connection or a movable connection, and the anti-adhesion movable contact can be connected to the movable contact body in a fixed connection or a movable connection.

[0046] For example, see Figure 3 The anti-sticking fixed contact 181 is fixedly connected to the fixed contact body 111, and the anti-sticking linked movable contact 171 is fixedly connected to the movable contact body 13. This allows the anti-sticking linked movable contact 171 to move with the movable contact body 13, simplifying the mechanical structure. Furthermore, the anti-sticking fixed contact 181 can be connected to the fixed contact body 111 by welding, riveting, or bolting, and the anti-sticking linked movable contact 171 can be connected to the movable contact body 13 by welding, riveting, or bolting.

[0047] Furthermore, when the anti-adhesion fixed contact is fixedly connected to the fixed contact body and the anti-adhesion movable contact is fixedly connected to the movable contact body, the shape of the anti-adhesion fixed contact and the shape of the anti-adhesion movable contact can be designed so that the anti-adhesion movable contact can contact the anti-adhesion fixed contact under the drive of the movable contact body.

[0048] For example, one end of the anti-adhesion fixed contact 181 is fixedly connected to the fixed contact body 111, and the other end of the anti-adhesion fixed contact 181 extends to the position of the anti-adhesion movable contact 171 when the movable contact body 13 is in the reset state. Figure 3 The end position of the left end of the anti-adhesion movable contact 171 is adjusted so that the anti-adhesion fixed contact 181 is spaced a certain distance from the anti-adhesion movable contact 171 at this time and the distance is relatively close. In addition, the shape between the two ends of the anti-adhesion fixed contact 181 matches the sliding track of the anti-adhesion movable contact 171, so that the anti-adhesion fixed contact 181 and the anti-adhesion movable contact 171 are slidably connected during the movement of the movable contact body 13. Figure 3 The anti-adhesion movable contact 171 can move up and down following the movable contact body 13, and the sliding trajectory can be a straight line. Accordingly, the surface of at least part of the anti-adhesion fixed contact 181 close to the side of the anti-adhesion movable contact 171 is a straight line in the vertical direction.

[0049] To ensure good contact between the anti-adhesion fixed contact and the anti-adhesion interlocking contact, the portion of the anti-adhesion fixed contact 181 that contacts the anti-adhesion interlocking contact 171 may be smooth. In other words, the sliding connection between the anti-adhesion fixed contact 181 and the anti-adhesion interlocking contact 171 may be a smooth sliding connection.

[0050] More specifically, when the anti-adhesion fixed contact is fixedly connected to the fixed contact body, and the anti-adhesion movable contact is fixedly connected to the movable contact body, the anti-adhesion fixed contact and the anti-adhesion movable contact can be designed according to the existing relay. Figure 3 The anti-adhesion fixed contact 181 is fixedly connected to and can protrude from the side of the fixed contact body 111. The side may refer to the side close to the outside of the relay. Figure 3 The outer side of the fixed contact body 111 is the left side, and the outer side of the fixed contact body 112 is the right side. Furthermore, the anti-adhesion fixed contact 181 is in the shape of an L, one end of which is connected to the fixed contact body 111 and the other end is close to the anti-adhesion interlocking contact 171. Here, the anti-adhesion fixed contact is in the shape of an L, which means that as long as the relay is in an L shape when it is in a certain placement posture, it is not limited to the situation where the relay is in a specific posture, so the shape of the anti-adhesion fixed contact of this embodiment can be various deformations of the L shape. In addition, at least one section of the L shape cooperates with the linear sliding trajectory of the anti-adhesion interlocking contact 171. As Figure 3 As shown, the anti-adhesion fixed contact 181 on the left is an inverted L-shape in this relay posture, and the anti-adhesion linkage contact 171 on the left can slide along the left half of the L-shaped anti-adhesion fixed contact 181 on the left side; the anti-adhesion fixed contact 182 on the right is an L-shape rotated one hundred and eighty degrees in this relay posture.

[0051] Furthermore, in order to achieve better contact between the anti-adhesion movable contact and the anti-adhesion fixed contact, the two can be elastically contacted. Figure 4 When the anti-adhesion interlocking contact 171 slides and conductively connects to the anti-adhesion fixed contact 181 , elastic extrusion contact may be formed between the anti-adhesion interlocking contact 171 and the anti-adhesion fixed contact 181 .

[0052] During specific implementation, elastic materials can be selected to enable elastic extrusion contact between the anti-adhesion movable contact and the anti-adhesion fixed contact. Specifically, both the anti-adhesion fixed contact 181 and the anti-adhesion movable contact 171 can be made of conductive materials, and at least one of the two (the anti-adhesion fixed contact 181 and the anti-adhesion movable contact 171) is made of elastic material. In other embodiments, it is not ruled out that the elastic extrusion contact between the anti-adhesion movable contact and the anti-adhesion fixed contact can be achieved by mechanical structure design so that they can move relative to each other.

[0053] To ensure that the resistance of the branch containing the anti-adhesion movable contact and the anti-adhesion fixed contact gradually changes during the sliding process between the anti-adhesion movable contact and the anti-adhesion fixed contact, and that the resistance is greater than or similar to the resistance of the branch containing the fixed contact body and the movable contact body when closed, the anti-adhesion fixed contact can be made of a high-resistance material. For example, the anti-adhesion fixed contact can be made of a conductive material with a resistivity no less than that of copper. If only one high-resistance material is used, the resistance of the branch can be changed by changing the length of the anti-adhesion fixed contact in that branch.

[0054] In other embodiments, the anti-adhesion fixed contact can be made of at least one conductive material whose resistivity is not lower than the resistivity of copper. In the case where there are multiple high-resistance materials, the resistivity of the material used for each section of the anti-adhesion fixed contact can be made different, so that the purpose of resistance change can be achieved by changing the material. For example, in the case where the anti-adhesion fixed contact is made of multiple conductive materials whose resistivity is not lower than the resistivity of copper, the anti-adhesion fixed contact is connected from one end close to the anti-adhesion movable contact (such as Figure 3 The lower left end of the anti-adhesion fixed contact 181) is connected to one end of the fixed contact body (such as Figure 3 The resistivity of the conductive material of the anti-adhesion fixed contact 181) decreases one by one as the conductive material changes (such as Figure 3 In the anti-adhesion fixed contact 181, at least the resistivity of the materials of the left section increases continuously from bottom to top).

[0055] In addition, according to the performance requirements of the anti-adhesion fixed contact, corresponding materials can be selected. For example, the conductive material of the anti-adhesion fixed contact may include one or more of pure metal, metal alloy, and graphite. When made of pure metal, metal alloy, etc., the anti-adhesion fixed contact can be a non-elastic material. When made of graphite, etc., the anti-adhesion fixed contact can be an elastic material. According to the performance requirements of the anti-adhesion interlocking contact, corresponding materials can be selected. For example, if the anti-adhesion interlocking contact needs to be elastic, an elastic material can be selected. Specifically, for example, the anti-adhesion interlocking contact can be made of graphite material.

[0056] Further, see Figure 3 The relay of each embodiment may further include a movable contact push rod 4 and a drive coil 5. The movable contact push rod 4 is connected to the movable contact body 13 and is used to push the movable contact body 13 toward the fixed contact bodies 111 and 112 under the action of the electromagnetic force provided by the drive coil 5.

[0057] In addition, the above embodiments are mainly described by taking the fixed contact body 111, the movable contact body 13, the anti-adhesion fixed contact 181, and the anti-adhesion movable contact 171 as examples. Then, in a specific embodiment, see Figure 3The relay may include the first fixed contact body 111, the second fixed contact body 112, the moving contact body 13, the first anti-adhesion fixed contact 181, the second anti-adhesion fixed contact 182, the first anti-adhesion linked moving contact 171, and the second anti-adhesion linked moving contact 172.

[0058] Among them, see Figure 4 and Figure 5 The first anti-adhesion movable contact 171 is used to slide and conductively connect the first anti-adhesion fixed contact 181 during the movement of the movable contact body 13 toward the first fixed contact body 111, so that the resistance between the connection position between the first fixed contact body 111 and the first anti-adhesion fixed contact 181 and the connection position between the movable contact body 13 and the first anti-adhesion movable contact 171 is continuously reduced until the movable contact body 13 and the first fixed contact body 111 are in contact and closed. The first anti-adhesion movable contact 171 is also used to connect the movable contact body 13 and the first fixed contact body 111 to the movable contact body 111. During the process of the point body 13 and the first fixed contact body 111 being disconnected and the moving contact body 13 moving away from the first fixed contact body 111, the first anti-adhesion fixed contact 181 is slid and conductively connected, so that the resistance between the connection position between the first fixed contact body 111 and the first anti-adhesion fixed contact 181 and the connection position between the moving contact body 13 and the first anti-adhesion moving contact 171 continues to increase, until the moving contact body 13 is reset, and the first anti-adhesion fixed contact 181 and the first anti-adhesion moving contact 171 are disconnected.

[0059] The second anti-adhesion movable contact 172 is used to slide and conductively connect the second anti-adhesion fixed contact 182 during the process of the movable contact body 13 moving toward the second fixed contact body 112, so that the resistance between the connection position between the second fixed contact body 112 and the second anti-adhesion fixed contact 182 and the connection position between the movable contact body 13 and the second anti-adhesion movable contact 172 continues to decrease until the movable contact body 13 and the second fixed contact body 182 are in contact and closed.

[0060] The resistance of the branch 190 formed by connecting the first anti-adhesion fixed contact 181 and the first anti-adhesion movable contact 171, the second anti-adhesion fixed contact 182 and the second anti-adhesion movable contact 172 is close to or greater than the resistance of the branch 113 formed by the movable contact body 13 in contact with the first fixed contact body 111 and the second fixed contact body 112.

[0061] The second anti-adhesion moving contact 172 is also used to slide and conductively connect the second anti-adhesion fixed contact 172 during the process when the moving contact body 13 and the second fixed contact body 112 are disconnected and the moving contact body 13 moves away from the second fixed contact body 112, so that the resistance between the connection position between the second fixed contact body 112 and the second anti-adhesion fixed contact 172 and the connection position between the moving contact body 13 and the second anti-adhesion moving contact 172 continues to increase until the moving contact body 13 is reset and the second anti-adhesion fixed contact 182 and the second anti-adhesion moving contact 172 are disconnected.

[0062] Among them, the above-mentioned first fixed contact body 111 and the second fixed contact body 112 can be symmetrically arranged and can be made of the same material. The above-mentioned first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 can be symmetrically arranged and can be made of the same material, and can be conductive materials such as pure metal, alloy metal or graphite. The above-mentioned first anti-adhesion moving contact 171 and the second anti-adhesion moving contact 172 can be symmetrically arranged and can be symmetrically arranged on both sides of the moving contact body 13, and can be welded, riveted or bolted. The connection position can partially extend into the moving contact body and can be an elastic conductive material. The moving contact body 13 can be integrated with the moving contact push rod 4 to form a T shape.

[0063] In order to enable those skilled in the art to better understand the present invention, the following describes the implementation of the present invention with reference to specific examples.

[0064] See also Figures 3 to 5 In a specific embodiment, the relay includes: a first fixed contact (a first fixed contact body 111), a second fixed contact (i.e., a second fixed contact body 112), a moving contact (i.e., a moving contact body 13), a moving contact push rod 4, a driving coil 5, a shell 6, a first anti-adhesion moving contact 171, a second anti-adhesion moving contact 172, a first anti-adhesion fixed contact 181, a second anti-adhesion fixed contact 182, etc.

[0065] In order to improve the load-absorbing capability of the relay, this embodiment proposes a new structure of fixed contacts and moving contacts of the relay. Figures 3 to 5, the first fixed contact body 111 and the second fixed contact body 112 of the relay are both conductively extended with a section of high-resistivity conductive material as the first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 respectively, and the first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 can be connected to the first fixed contact 111 and the second fixed contact 112 by welding, riveting or bolting. The first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 are made of a conductive material with a resistivity not lower than that of copper, and can be a conductive material such as pure metal, metal alloy, graphite, etc. The first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 can be made of a high-resistivity conductive material, or can be formed by conductively connecting multiple sections of conductive materials with different resistivities.

[0066] A conductive elastic probe is attached to each end of the moving contact body 13 of the relay as the first anti-adhesion moving contact 171 and the second anti-adhesion moving contact 172 (the anti-adhesion moving contacts 171 and 172 can be located on the side of the moving contact body 13 close to the anti-adhesion fixed contacts 181 and 182 respectively). The first anti-adhesion moving contact 171 and the second anti-adhesion moving contact 172 can be made of graphite material. The specific structural design should ensure that when the moving contact body 13 moves up and down, the first anti-adhesion moving contact 171 and the second anti-adhesion moving contact 172 can be smoothly connected to the first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 respectively. When the moving contact body 13 is in the reset state, the first anti-adhesion moving contact 171 and the second anti-adhesion moving contact 172 are separated from the first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 respectively and a certain electrical gap is ensured.

[0067] During the closing operation of the relay, the driving coil 5 of the relay is energized to form an electromagnetic force to push the moving contact push rod 4 upward, and the moving contact body 13 drives the first anti-adhesion moving contact 171 and the second anti-adhesion moving contact 172 to move upward. The first anti-adhesion moving contact 171 and the second anti-adhesion moving contact 172 first contact the first anti-adhesion fixed contact 181 and the second anti-adhesion fixed contact 182 respectively. At this time, a high-resistance path is formed between the two fixed contacts of the relay, which plays a role in pre-closing of the relay, and thus starts to charge the load through a high-resistance path. Since the internal resistance of the high-resistivity material (anti-adhesion fixed contacts 181, 182) is relatively large, the current flowing through the anti-adhesion fixed contacts 181, 182 is limited, thereby avoiding the large current shock when the relay contacts are closed.

[0068] As the movable contact body 13 continues to rise, the corresponding contact positions of the anti-adhesion movable contacts 171, 172 and the anti-adhesion fixed contacts 181, 182 change, and the resistance value of the high-resistance path between the two fixed contacts will become smaller and smaller. When the movable contact body 13 contacts and conducts with the first fixed contact body 111 and the second fixed contact body 112, since a conductive path has been established through the anti-adhesion movable contacts 171, 172 and the anti-adhesion fixed contacts 181, 182, there is no high current shock and arcing when the movable contact body 13 closes with the first fixed contact body 111 and the second fixed contact body 112, thereby avoiding adhesion failure when the relay is closed.

[0069] After the relay's drive coil 5 is powered on and disconnected, the magnetic force disappears, and the movable contact push rod 4 moves downward. The movable contact body 13 first disconnects from the first and second fixed contact bodies 1 and 2, and then the anti-sticking movable contacts 171 and 172 contact the anti-sticking fixed contacts 181 and 182. As the movable contact push rod 4 continues to move downward and reset, the anti-sticking movable contacts 171 and 172 disconnect from the anti-sticking fixed contacts 181 and 182. Because the anti-sticking contacts disconnect last during the relay disconnection process, the main contacts of the anti-sticking relay are prevented from arcing and generating a large amount of heat during the disconnection process, which could cause the main contacts to melt and be damaged.

[0070] In short, in this embodiment, the relay can be a vertical anti-adhesion relay, or a high-voltage relay. The relay includes a fixed contact, a moving contact, and also includes an anti-adhesion fixed contact and an anti-adhesion moving contact. The anti-adhesion fixed contact is conductively connected to the fixed contact; the anti-adhesion moving contact is conductively connected to the moving contact. During the relay closure process, the elastic anti-adhesion moving contact can contact the anti-adhesion fixed contact. After the moving contact disconnects and the fixed contact is reset, the anti-adhesion moving contact can be disconnected from the anti-adhesion fixed contact. During the up and down movement of the moving contact, the elastic anti-adhesion moving contact can be smoothly connected to the anti-adhesion fixed contact. The anti-adhesion fixed contact can be made of at least one conductive material with a resistivity higher than that of copper. The high-resistivity conductive material can be pure metal, metal alloy or graphite. The anti-adhesion moving contact can be made of an elastic conductive material. The anti-adhesion moving contact can be made of graphite material.

[0071] In this embodiment, a group of anti-adhesion contacts can be added to the existing relay so that the anti-adhesion contacts are connected in parallel with the main contacts of the relay. During the closing process of the anti-adhesion relay, the anti-adhesion contacts are closed and turned on first, so as to avoid adhesion caused by the large current impact when the main contacts of the anti-adhesion relay are closed; during the disconnection process of the relay, the anti-adhesion contacts are disconnected last, so as to avoid the arcing of the main contacts of the anti-adhesion relay during the disconnection process to generate a large amount of heat and cause the main contacts to melt and be damaged. The anti-adhesion relay of this embodiment can greatly improve the conduction capacity of the relay contacts and improve the life of the relay. When used in the high-voltage power supply system of new energy vehicles, the pre-charging resistor and pre-charging relay connected in parallel to the main relay outside the system can be omitted, thereby reducing the system cost.

[0072] In summary, the relay of the embodiment of the present invention adds an anti-adhesion moving contact and an anti-adhesion fixed contact on the basis of the moving contact body and the fixed contact body, and in the process of relay closing, the anti-adhesion moving contact and the anti-adhesion fixed contact with larger connection resistance are closed first, forming a high-resistance path, which can be used for pre-charging, and the moving contact body and the fixed contact body are closed later, playing the role of relay pre-closing. In the process of relay disconnection, the moving contact body and the fixed contact body are disconnected first, and the anti-adhesion moving contact and the anti-adhesion fixed contact with larger connection resistance are disconnected again, gradually forming a high-resistance path, avoiding arcing, and thus preventing adhesion when the relay is closed. Moreover, by adding the anti-adhesion moving contact and the anti-adhesion fixed contact on the basis of the original moving contact and the fixed contact, there is no need to add additional pre-charging resistance and pre-charging relay, and the volume of the relay will hardly be increased. Moreover, the cost is also relatively low. Thus, the problems of poor load-carrying attraction and easy adhesion of the relay in the prior art can be solved.

[0073] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0075] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0076] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0077] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0078] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. The order of steps involved in each embodiment is used to schematically illustrate the implementation of the present invention, and the order of steps therein is not limited and can be appropriately adjusted as needed.

[0080] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A relay, characterized in that: include: Fixed contact body, moving contact body, anti-adhesion fixed contact, and anti-adhesion moving contact; The anti-adhesion fixed contact is conductively connected to the fixed contact body; the anti-adhesion movable contact is conductively connected to the movable contact body; One end of the anti-adhesion fixed contact is connected to and protrudes from the side surface of the fixed contact body, and the other end extends downward to a position close to the position of the anti-adhesion movable contact when the movable contact body is in the reset state; the anti-adhesion movable contact is arranged on the side surface of the movable contact body and extends outward; Wherein, the anti-sticking movable contact is used to slide and conductively connect the anti-sticking fixed contact during the process of the movable contact body moving toward the fixed contact body, so that the resistance between the connection position between the fixed contact body and the anti-sticking fixed contact and the connection position between the movable contact body and the anti-sticking movable contact continuously decreases until the movable contact body and the fixed contact body contact and close and conduct; the resistance of the branch formed by the connection of the anti-sticking fixed contact and the anti-sticking movable contact is close to or greater than the resistance of the branch formed by the contact between the movable contact body and the fixed contact body; The anti-sticking movable contact is further configured to slide and conductively connect the anti-sticking fixed contact during a process in which the movable contact body and the fixed contact body are disconnected and the movable contact body moves away from the fixed contact body, so that the resistance between a connection position between the fixed contact body and the anti-sticking fixed contact and a connection position between the movable contact body and the anti-sticking movable contact continuously increases until the movable contact body is reset, at which point the anti-sticking fixed contact and the anti-sticking movable contact are disconnected. The shape between the two ends of the anti-adhesion fixed contact matches the sliding track of the anti-adhesion movable contact, so that the anti-adhesion fixed contact and the anti-adhesion movable contact are smoothly slidably connected during the movement of the movable contact body.

2. The relay according to claim 1, wherein The anti-adhesion fixed contact is fixedly connected to the fixed contact body; the anti-adhesion movable contact is fixedly connected to the movable contact body.

3. The relay according to claim 2, wherein: The anti-adhesion fixed contact is fixedly connected to the side of the fixed contact body; the anti-adhesion fixed contact is L-shaped with one end connected to the fixed contact body and the other end close to the anti-adhesion movable contact.

4. The relay according to any one of claims 1 to 3, characterized in that: When the anti-adhesion interlocking contact slides and is conductively connected to the anti-adhesion fixed contact, elastic extrusion contact is formed between the anti-adhesion interlocking contact and the anti-adhesion fixed contact.

5. The relay according to claim 4, wherein: The anti-adhesion fixed contact and the anti-adhesion movable contact are both made of conductive material, and at least one of the conductive materials is an elastic material.

6. The relay according to claim 2 or 5, characterized in that: The anti-adhesion fixed contact is made of at least one conductive material whose resistivity is not lower than that of copper.

7. The relay according to claim 6, wherein: When the anti-adhesion fixed contact is made of a plurality of conductive materials having a resistivity not lower than that of copper, the resistivity of the conductive material of the anti-adhesion fixed contact from one end close to the anti-adhesion linked contact to the one end connected to the fixed contact body decreases one by one as the conductive material changes.

8. The relay according to claim 7, wherein: The conductive material of the anti-adhesion fixed contact includes one or more of pure metal, metal alloy, and graphite; and / or the anti-adhesion movable contact is made of graphite material.

9. The relay according to claim 1, wherein: Also includes: A movable contact push rod and a driving coil; the movable contact push rod is connected to the movable contact body and is used to push the movable contact body toward the fixed contact body under the action of the electromagnetic force provided by the driving coil; The relay includes the first fixed contact body, the second fixed contact body, the movable contact body, the first anti-adhesion fixed contact, the second anti-adhesion fixed contact, the first anti-adhesion linked movable contact, and the second anti-adhesion linked movable contact; The first anti-adhesion movable contact is used to slide and conductively connect the first anti-adhesion fixed contact during the movement of the movable contact body toward the first fixed contact body, so that the resistance between the connection position between the first fixed contact body and the first anti-adhesion fixed contact and the connection position between the movable contact body and the first anti-adhesion movable contact continuously decreases until the movable contact body and the first fixed contact body are in contact and closed; The first anti-adhesion linked movable contact is further configured to slide and conductively connect the first anti-adhesion fixed contact during a process in which the movable contact body and the first fixed contact body are disconnected and the movable contact body moves away from the first fixed contact body, so that the resistance between the connection position between the first fixed contact body and the first anti-adhesion fixed contact and the connection position between the movable contact body and the first anti-adhesion linked movable contact continuously increases until the movable contact body is reset and the first anti-adhesion fixed contact and the first anti-adhesion linked movable contact are disconnected; The second anti-adhesion movable contact is used to slide and conductively connect the second anti-adhesion fixed contact during the movement of the movable contact body toward the second fixed contact body, so that the resistance between the connection position between the second fixed contact body and the second anti-adhesion fixed contact and the connection position between the movable contact body and the second anti-adhesion movable contact continuously decreases until the movable contact body and the second fixed contact body contact and close the connection; The resistance of a branch formed by the first anti-adhesion fixed contact, the first anti-adhesion linked movable contact, the second anti-adhesion fixed contact, and the second anti-adhesion linked movable contact is close to or greater than the resistance of a branch formed by the movable contact body, the first fixed contact body, and the second fixed contact body; The second anti-adhesion linked movable contact is also used to slide and conductively connect the second anti-adhesion fixed contact during the process of the movable contact body and the second fixed contact body being disconnected and the movable contact body moving away from the second fixed contact body, so that the resistance between the connection position between the second fixed contact body and the second anti-adhesion fixed contact and the connection position between the movable contact body and the second anti-adhesion linked movable contact continues to increase until the movable contact body is reset and the second anti-adhesion fixed contact and the second anti-adhesion linked movable contact are disconnected.

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