Contactor

Abstract

The utility model relates to the technical field of switching devices, and particularly discloses a contactor, which comprises a middle contact and a static contact which are arranged in an inner cavity of a shell, the moving contact assembly is arranged in the inner cavity of the shell and comprises a moving contact and a contact support linked with the moving contact; the reset elastic piece can apply elastic force to the moving contact assembly to enable the moving contact to be far away from the static contact; the buffering assembly is arranged on the shell, and the output end of the buffering assembly is provided with a first position, a second position and a balance position located between the first position and the second position. The output end of the buffer assembly can apply elastic force to the moving contact assembly so that the moving contact can be close to the static contact. When the moving contact and the static contact are separated, the elastic force applied to the moving contact assembly by the output end of the buffer assembly at the balance position is equal to the elastic force applied to the moving contact assembly by the reset elastic piece. The above arrangement reduces the possibility of arc reignition.

Description

Technical Field

[0001] The utility model relates to the technical field of switch electrical appliances, in particular to a contactor. Background Art

[0002] Contactors have been widely used in the field of low-voltage electrical appliances. They mainly include a shell, a static contact fixed on the shell, a moving contact movably connected to the shell, and an electromagnetic assembly that controls the moving contact. When the electromagnetic assembly is released, the moving contact moves away from the static contact under the action of the elastic part in the electromagnetic assembly. When the moving contact leaves the static contact to the maximum distance, it collides with the shell bracket and then rebounds, which reduces the distance between the moving contact and the static contact, easily causing the arc to reignite or even burn the contact.

[0003] Therefore, it is urgent to study a contactor to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a contactor to reduce the possibility of arc reignition caused by rebound during the process of a moving contact leaving a stationary contact in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Contactors, including:

[0007] case;

[0008] A static contact, arranged in the inner cavity of the housing;

[0009] A moving contact assembly is arranged in the inner cavity of the housing, the moving contact assembly comprises a moving contact and a contact support linked with the moving contact, the moving contact assembly is subjected to the elastic force of the resetting elastic member and can be away from the static contact;

[0010] A buffer assembly, wherein the buffer assembly is disposed on the housing, and an output end of the buffer assembly has a first position, a second position, and a balance position between the first position and the second position;

[0011] The output end of the buffer assembly can apply an elastic force to the moving contact assembly to make the moving contact close to the static contact; the elastic force applied to the moving contact assembly by the output end of the buffer assembly located at the equilibrium position is equal to the elastic force applied to the moving contact assembly by the reset elastic member.

[0012] As a feasible technical solution for a contactor, the buffer assembly includes a buffer spring, which applies an elastic force to the moving contact assembly. The buffer spring is configured to have a first deformation amount, a second deformation amount and a third deformation amount respectively when the output end of the buffer assembly is located at the first position, the equilibrium position and the second position, wherein the first deformation amount is smaller than the second deformation amount, and the second deformation amount is smaller than the third deformation amount.

[0013] As a feasible technical solution for the contactor, the contact support is slidably arranged in the inner cavity of the housing, and the contact support is configured so that when the output end of the buffer assembly is located at the second position, the distance between the contact support and the static contact is the farthest; and / or

[0014] The contact support is configured to abut against a lower limit portion of the housing when the output end of the buffer assembly is located at the second position.

[0015] As a feasible technical solution for the contactor, the housing has a buffer groove, and a portion of the buffer spring is disposed in the buffer groove, and a portion extends out of the buffer groove.

[0016] As a feasible technical solution for a contactor, the buffer assembly includes a fixing part, the shell is provided with a buffer channel connected to the inner cavity, the fixing part is fixed to the shell, one end of the buffer spring abuts against the fixing part, and the buffer channel forms at least a part of the circumferential side wall of the buffer groove.

[0017] As a feasible technical solution for the contactor, the fixing member is provided with a receiving groove opening toward the housing, and at least a part of the buffer spring is located in the receiving groove and abuts against the bottom of the receiving groove.

[0018] As a feasible technical solution for a contactor, the buffer assembly includes a buffer spring and a buffer member. The buffer member is planar at one end close to the contact support and forms the output end of the buffer assembly. The buffer spring applies elastic force to the moving contact assembly through the buffer member.

[0019] As a feasible technical solution for the contactor, a mounting groove is provided at one end of the buffer member away from the contact support, and the buffer spring is partially located in the mounting groove and partially located outside the mounting groove.

[0020] As a feasible technical solution for a contactor, the buffer component is provided with a first limiting portion, and the housing is provided with a second limiting portion, and the first limiting portion and the second limiting portion abut against each other to limit the output end of the buffer assembly to stop at the first position.

[0021] As a feasible technical solution for a contactor, the shell is provided with a buffer channel connected to the inner cavity, the side wall of the buffer member protrudes outward to form the first limiting portion, the outer diameter of the first limiting portion is larger than the inner diameter of the buffer channel, the outer side of the shell and the part located on the outer periphery of the buffer channel form the second limiting portion, and the first limiting portion is located on the outside of the shell.

[0022] The beneficial effects of the utility model are:

[0023] The utility model provides a contactor, which is provided with a buffer assembly, wherein the output end of the buffer assembly located at a balanced position exerts the same force as the resetting elastic member on the moving contact assembly, so that the moving contact can be kept stationary at this position, so that the distance between the stationary contact and the moving contact is a safe distance.

[0024] By setting the buffer component, and the output end of the buffer component having a first position, a second position and a balance position between the first position and the second position, the moving contact first contacts the output end of the buffer component located at the first position after leaving the static contact, and in the process of the moving contact component continuing to move, the buffer component begins to apply an elastic force to the moving contact component, thereby reducing the acceleration of the moving contact component, and when the moving contact continues to move, pushing the output end of the buffer component to move to the balance position, the force on the moving contact component reaches a balance, and the acceleration is zero, and in the process of the moving contact component continuing to move away from the static contact, the elastic force applied by the buffer component to the moving contact component is greater than the elastic force applied by the reset elastic member to the moving contact component, and the speed of the moving contact component begins to decrease, and when the output end of the buffer component moves to the second position under the push of the moving contact component, the speed of the moving contact component drops to the minimum, and then the moving contact component rebounds, and finally, under the action of the buffer component and the reset elastic member, the output end of the buffer component fluctuates up and down at the balance position, and finally stops at the balance position, and the moving contact and the static contact are relatively stationary. During this process, firstly, the distance between the moving contact and the stationary contact is longer, so that the arc is easier to extinguish and less likely to reignite; secondly, since the moving contact assembly is blocked by the buffer assembly in the process of moving away from the stationary contact, the timing for the moving contact assembly to contact the shell and be rebounded is delayed, thereby providing more sufficient time for insulating media such as air to move between the moving contact and the stationary contact, reducing the possibility of the arc reigniting; finally, after the moving contact assembly pushes the buffer assembly to the equilibrium position, it continues to move away from the stationary contact, so that the elastic force generated by the reset elastic member continues to decrease, and the elastic force generated by the buffer assembly continues to increase. During this process, part of the energy is consumed in the reset elastic member and the buffer assembly, resulting in a decrease in the rebound amount of the moving contact assembly, reducing the possibility of the arc reigniting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a schematic diagram of the structure of the contactor in the embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the explosion structure of the contactor in the embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of a contactor in an embodiment of the utility model;

[0028] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0029] In the figure:

[0030] 100, housing; 101, first housing; 102, second housing; 110, sliding groove; 111, guide plate; 120, buffer channel; 130, second limiting portion; 140, lower limiting portion;

[0031] 200, static contact;

[0032] 300, moving contact assembly; 310, moving contact; 320, contact support; 321, linkage hole;

[0033] 400, buffer assembly; 410, buffer spring; 420, fixing member; 421, receiving groove; 430, buffer member; 431, mounting groove; 432, first limiting portion;

[0034] 510, first spring; 520, second spring; 530, partition. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] like Figures 1 to 4 As shown, this embodiment provides a contactor, which provides elastic force to buffer the moving contact assembly 300 in the process of moving away from the static contact 200 by setting the structure of the buffer assembly 400, and can absorb part of the energy, thereby reducing the speed of the moving contact assembly 300 when contacting the shell 100, thereby reducing the rebound distance and reducing the probability of the arc reigniting; in addition, the timing of the moving contact assembly 300 whose speed is restricted contacting the shell 100 is postponed, which provides sufficient time for the medium such as air to flow between the moving contact 310 and the static contact 200, thereby reducing the probability of the arc reigniting.

[0040] In some embodiments, the contactor includes a housing 100 , a stationary contact 200 , a moving contact assembly 300 , an electromagnetic assembly, and a buffer assembly 400 , wherein the electromagnetic assembly is not shown in the drawings. The static contact 200 is arranged in the inner cavity of the shell 100; the moving contact assembly 300 is arranged in the inner cavity of the shell 100, and the moving contact assembly 300 includes a moving contact 310 and a contact support 320 linked to the moving contact 310; the electromagnetic assembly includes a reset elastic member, and the reset elastic member can apply an elastic force to the moving contact assembly 300 to make the moving contact 310 away from the static contact 200; the buffer assembly 400 is arranged in the shell 100, and the output end of the buffer assembly 400 has a first position, a second position and a balanced position between the first position and the second position; the output end of the buffer assembly 400 can apply an elastic force to the moving contact assembly 300 to make the moving contact 310 close to the static contact 200; when the moving contact 310 and the static contact 200 are separated, the elastic force applied by the output end of the buffer assembly 400 located in the balanced position to the moving contact assembly 300 is equal to the elastic force applied by the reset elastic member to the moving contact assembly 300.

[0041] It should be noted that when the output end of the buffer assembly 400 is located at a balanced position, without interference from external forces, the distance between the moving contact 310 and the stationary contact 200 connected to the buffer assembly 400 remains unchanged.

[0042] By setting the buffer assembly 400, after the moving contact 310 leaves the stationary contact 200, it first contacts the output end of the buffer assembly 400 located at the first position. As the moving contact assembly 300 continues to move, the buffer assembly 400 begins to apply elastic force to the moving contact assembly 300, thereby reducing the acceleration of the moving contact assembly 300. When the moving contact 310 continues to move, pushing the output end of the buffer assembly 400 to move to the equilibrium position, the force on the moving contact assembly 300 reaches equilibrium, and the acceleration is zero. As the moving contact assembly 300 continues to move away from the stationary contact 200, The elastic force applied by the buffer assembly 400 to the moving contact assembly 300 is greater than the elastic force applied by the reset elastic member to the moving contact assembly 300, and the speed of the moving contact assembly 300 begins to decrease. When the output end of the buffer assembly 400 moves to the second position under the push of the moving contact assembly 300, the speed of the moving contact assembly 300 drops to the minimum, and then the moving contact assembly 300 rebounds. Finally, under the action of the buffer assembly 400 and the reset elastic member, the output end of the buffer assembly 400 fluctuates up and down at the equilibrium position and finally stops at the equilibrium position, and the moving contact 310 and the static contact 200 are relatively stationary. During this process, first, when the output end of the buffer assembly 400 moves to the second position under the push of the moving contact assembly 300, the distance between the moving contact 310 and the static contact 200 is longer, making it easier to extinguish the arc and less likely to reignite; secondly, since the moving contact assembly 300 is blocked by the buffer assembly 400 in the process of moving away from the static contact 200, the timing for the moving contact assembly 300 to contact the housing 100 and be rebounded is delayed, thereby providing more sufficient time for insulating media such as air to move between the moving contact 310 and the static contact 200, reducing the possibility of the arc reigniting; finally, after the moving contact assembly 300 pushes the buffer assembly 400 to the equilibrium position, it continues to move away from the static contact 200, so that the elastic force generated by the reset elastic member continues to decrease, and the elastic force generated by the buffer assembly 400 continues to increase. During this process, part of the energy is consumed in the reset elastic member and the buffer assembly 400, resulting in a reduction in the rebound amount of the moving contact assembly 300, reducing the possibility of the arc reigniting.

[0043] Combination Figure 3 and Figure 4As shown, in some embodiments, the buffer assembly 400 includes a buffer spring 410, wherein the buffer spring 410 applies elastic force to the moving contact assembly 300, and when the output end of the buffer assembly 400 is located at the first position, the buffer spring 410 has a first deformation; when the output end of the buffer assembly 400 is located at the equilibrium position, the buffer spring 410 has a second deformation; when the output end of the buffer assembly 400 is located at the second position, the buffer spring 410 has a third deformation; the first deformation is smaller than the second deformation, and the second deformation is smaller than the third deformation. This setting makes the elastic force applied by the buffer assembly 400 gradually increase as the position of the moving contact assembly 300 changes, thereby helping to achieve buffering of the moving contact assembly 300, gradually reducing its speed, and improving the stability of movement.

[0044] The buffer spring 410 can be a compression spring, a tension spring or a torsion spring, as long as it can provide a buffer elastic force, and the specific installation form of the tension spring, compression spring and torsion spring can be appropriately adjusted according to the force characteristics. Of course, in other embodiments, the buffer assembly 400 can also include an elastic rubber pad.

[0045] Exemplarily, the buffer spring 410 is a compression spring. When the output end of the buffer assembly 400 is located at a first position, the buffer spring 410 has a first compression amount; when the output end of the buffer assembly 400 is located at a balanced position, the buffer spring 410 has a second compression amount; when the output end of the buffer assembly 400 is located at a second position, the buffer spring 410 has a third compression amount.

[0046] To ensure that the contact support 320 can slide smoothly in the shell 100, in some embodiments, a sliding groove 110 for the contact support 320 to slide is provided inside the shell 100. When the output end of the buffer assembly 400 is in the second position, it is farthest from the static contact 200. At this time, the contact support 320 reaches the lower limit position, and the contact support 320 abuts against the lower limit portion 140 of the shell 100.

[0047] Two guide plates 111 arranged opposite to each other are arranged in the housing 100 , and the sliding groove 110 is formed between the two guide plates 111 . The arrangement of the guide plates 111 also helps to enhance the strength of the housing 100 .

[0048] In order to ensure that the buffer spring 410 has sufficient buffering capacity, it needs to have a certain length. In some embodiments, the housing 100 has a buffer groove connected to the sliding groove 110, and part of the buffer spring 410 is arranged in the buffer groove, and part of it extends outside the buffer groove. This configuration provides space for the compression of the buffer spring 410; at the same time, it can also effectively prevent the buffer spring 410 from twisting or deflecting during the compression process, thereby improving the telescopic reliability of the buffer spring 410.

[0049] In some embodiments, one end of the buffer spring 410 may be connected to the bottom of the buffer groove, so that when the movable contact 310 contacts the stationary contact 200, the buffer spring 410 and the contact support 320 connected to the movable contact 310 are separated, and after the movable contact assembly 300 and the stationary contact 200 are separated, the buffer spring 410 contacts the contact support 320. In some embodiments, one end of the buffer spring 410 may be fixedly connected to the contact support 320, and follow the contact support 320 to approach or move away from the stationary contact 200.

[0050] In some embodiments, the buffer assembly 400 includes a fixing member 420, the housing 100 is provided with a buffer channel 120, the buffer channel 120 is connected to the sliding groove 110, the fixing member 420 is fixed to the housing 100 by screws, and is at least partially located at one end of the buffer channel 120 away from the sliding groove 110, the fixing member 420 forms at least part of the bottom of the buffer groove, and the buffer channel 120 forms at least part of the circumferential side wall of the buffer groove. This arrangement can effectively utilize the existing housing 100 structure, avoid major changes, and help reduce mold opening costs.

[0051] In some embodiments, the buffer assembly 400 further includes a buffer member 430, one end of the buffer member 430 close to the contact support 320 is planar and forms the output end of the buffer assembly 400, and the buffer spring 410 abuts between the fixing member 420 and the buffer member 430. This arrangement can make the contact between the buffer member 430 and the contact support 320 more stable, which helps to improve the force stability of the buffer spring 410.

[0052] In order to improve the connection convenience between the buffer spring 410 and the buffer member 430, a mounting groove 431 is provided at one end of the buffer member 430 away from the contact support 320, and the buffer spring 410 is partially located in the mounting groove 431 and partially located outside the mounting groove 431. This arrangement helps to ensure the connection reliability between the buffer member 430 and the buffer spring 410, and prevents the buffer spring 410 from being misaligned during the expansion and contraction process, resulting in separation from the buffer member 430.

[0053] When the moving contact 310 and the static contact 200 in the moving contact assembly 300 are in contact, the output end of the buffer assembly 400 needs to be maintained at the first position to facilitate the calculation of force balance and improve the reliability of operation. To this end, in some embodiments, the buffer member 430 is provided with a first limiting portion 432, and the housing 100 is provided with a second limiting portion 130. The first limiting portion 432 and the second limiting portion 130 abut against each other to limit the output end of the buffer assembly 400 to stop at the first position.

[0054] Exemplarily, the side wall of the buffer 430 bulges outward to form a first limiting portion 432, and the part of the housing 100 close to the fixing member 420 and located on the outer periphery of the buffer channel 120 forms a second limiting portion 130, the outer diameter of the first limiting portion 432 is greater than the inner diameter of the buffer channel 120, the buffer 430 is inserted into the buffer channel 120, and the first limiting portion 432 is located between the second limiting portion 130 and the fixing member 420. This arrangement allows the buffer assembly 400 to be assembled after the internal components of the entire contactor are assembled, and it is only necessary to first pass the buffer 430 through the buffer channel 120, and then place the buffer spring 410 in the mounting groove 431 of the buffer 430, and finally connect the fixing member 420 to the housing 100 and crimp the buffer spring 410. The above structure improves the assembly efficiency of the buffer assembly 400, and will not affect the internal structures such as the moving contact assembly 300 and the static contact 200, which is conducive to ensuring the reliability of the contactor function.

[0055] To further improve the installation efficiency of the buffer assembly 400, in some embodiments, the buffer 430 is cylindrical, and the first limit portion 432 surrounds the outer circumference of the buffer 430 to form a truncated cone structure. The above arrangement allows the buffer 430 to be installed in the buffer channel 120 at any angle, as long as the axis of the buffer 430 is parallel to the buffer channel 120, which greatly improves the installation efficiency of the buffer 430.

[0056] Combination Figure 4 As shown, in order to facilitate the accommodation of the first limiting portion 432, in some embodiments, the fixing member 420 is provided with a receiving groove 421 with an opening toward the housing 100, and the first limiting portion 432 can slide in the receiving groove 421. The buffer spring 410 is partially located in the receiving groove 421, and one end away from the static contact 200 abuts against the bottom of the receiving groove 421. The receiving groove 421 provides a partial accommodation space for the buffer spring 410, and when the fixing member 420 is installed, the buffer spring 410 is fixed in the receiving groove 421, and will not be twisted to cause the spring to fly.

[0057] Combination Figure 1 and Figure 2 As shown, in some embodiments, the contact support 320 is provided with a linkage hole 321, and the electromagnetic assembly further includes a toggle shaft, which is inserted into the linkage hole 321. During the movement of the toggle shaft, the contact support 320 is driven to approach or move away from the static contact 200, thereby driving the moving contact 310 linked with the contact support 320 to approach or move away from the static contact 200. The first shell 101 and the second shell 102 are buckled and enclosed to form an inner cavity structure for installing the static contact 200 and the moving contact assembly 300. Among them, at least the second shell 102 is provided with a toggle groove extending along the moving direction of the contact support 320 for the toggle shaft to penetrate.

[0058] Combination Figure 3As shown, in order to avoid a rigid collision between the moving contact 310 and the stationary contact 200, in some embodiments, the moving contact 310 and the contact support 320 are slidably matched, and a first spring 510 is provided between the moving contact 310 and the contact support 320, and the first spring 510 applies an elastic force to the moving contact 310 and makes the moving contact 310 close to the stationary contact 200. The above arrangement allows the moving contact 310 and the stationary contact 200 to be buffered by the elastic force of the first spring 510 when they are in contact, thereby avoiding a rigid collision between the two, and improving the service life and the stability of the connection.

[0059] When the moving contact 310 is away from the static contact 200, in order to avoid an arc between the two static contacts 200, in some embodiments, the contactor also includes a second spring 520 and a partition 530, the partition 530 is slidably disposed on the shell 100 and is located between the two static contacts 200, the second spring 520 is disposed between the partition 530 and the shell 100, and the second spring 520 applies an elastic force to the partition 530 so that the partition 530 always abuts against the static contact 200, wherein the partition 530 is made of insulating material.

[0060] When in use, the coil of the electromagnetic assembly is de-energized, and under the action of the resetting elastic member, the contact support 320 moves away from the stationary contact 200, thereby separating the movable contact 310 from the stationary contact 200. During the movement of the contact support 320, the contact comes into contact with the buffer 430 located at the first position. During the continued movement of the contact support 320, the buffer 430 moves away from the stationary contact 200 to the second position, and at the same time, the stationary contact 200 collides with the lower limit portion 140 of the housing 100 and rebounds. After a period of time, the buffer 430 is stationary at a balanced position.

[0061] It should be noted that the manner in which the electromagnetic assembly controls the moving contact 310 and the stationary contact 200 to maintain contact through the coil is well known to those skilled in the art and is not the focus of the present application, so it will not be described in detail here.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A contactor, characterized in that: include: Housing (100); A stationary contact (200) is disposed in the inner cavity of the housing (100); A moving contact assembly (300) is arranged in the inner cavity of the housing (100), the moving contact assembly (300) comprising a moving contact (310) and a contact support (320) linked to the moving contact (310), the moving contact assembly (300) being subject to the elastic force of the resetting elastic member and being able to move away from the stationary contact (200); A buffer component (400), the buffer component (400) being arranged on the housing (100), the output end of the buffer component (400) having a first position, a second position, and a balance position located between the first position and the second position; The output end of the buffer assembly (400) can apply an elastic force to the moving contact assembly (300) so that the moving contact (310) is close to the static contact (200); the elastic force applied to the moving contact assembly (300) by the output end of the buffer assembly (400) located at the equilibrium position is equal to the elastic force applied to the moving contact assembly (300) by the reset elastic member.

2. The contactor according to claim 1, characterized in that: The buffer assembly (400) comprises a buffer spring (410), wherein the buffer spring (410) applies an elastic force to the moving contact assembly (300), and the buffer spring (410) is configured to have a first deformation amount, a second deformation amount and a third deformation amount respectively when the output end of the buffer assembly (400) is located at the first position, the equilibrium position and the second position, wherein the first deformation amount is smaller than the second deformation amount, and the second deformation amount is smaller than the third deformation amount.

3. The contactor according to claim 1, characterized in that: The contact support (320) is slidably disposed in the inner cavity of the housing (100), and the contact support (320) is configured such that when the output end of the buffer assembly (400) is located at the second position, the distance between the contact support (320) and the stationary contact (200) is the farthest; and / or The contact support (320) is configured to abut against a lower limit portion (140) of the housing (100) when the output end of the buffer assembly (400) is located at the second position.

4. The contactor according to claim 2, characterized in that: The housing (100) has a buffer groove, and a portion of the buffer spring (410) is disposed in the buffer groove and a portion thereof extends out of the buffer groove.

5. The contactor according to claim 4, characterized in that: The buffer assembly (400) includes a fixing member (420), the shell (100) is provided with a buffer channel (120) connected to the inner cavity, the fixing member (420) is fixed to the shell (100), one end of the buffer spring (410) abuts against the fixing member (420), and the buffer channel (120) forms at least a portion of the circumferential side wall of the buffer groove.

6. The contactor according to claim 5, characterized in that: The fixing member (420) is provided with a receiving groove (421) opening toward the housing (100), and at least a portion of the buffer spring (410) is located in the receiving groove (421) and abuts against the bottom of the receiving groove (421).

7. The contactor according to claim 1, characterized in that: The buffer assembly (400) comprises a buffer spring (410) and a buffer member (430); one end of the buffer member (430) close to the contact support (320) is planar and forms an output end of the buffer assembly (400); the buffer spring (410) applies an elastic force to the moving contact assembly (300) through the buffer member (430).

8. The contactor according to claim 7, characterized in that: An installation groove (431) is provided at one end of the buffer member (430) facing away from the contact support (320); the buffer spring (410) is partially located in the installation groove (431) and partially located outside the installation groove (431).

9. The contactor according to claim 7, characterized in that: The buffer component (430) is provided with a first limiting portion (432), and the housing (100) is provided with a second limiting portion (130), and the first limiting portion (432) and the second limiting portion (130) are in abutment with each other to limit the output end of the buffer assembly (400) to stop at the first position.

10. The contactor according to claim 9, characterized in that: The shell (100) is provided with a buffer channel (120) connected to the inner cavity, the side wall of the buffer member (430) protrudes outward to form the first limiting portion (432), the outer diameter of the first limiting portion (432) is greater than the inner diameter of the buffer channel (120), the outer side of the shell (100) and the part located on the outer periphery of the buffer channel (120) form the second limiting portion (130), and the first limiting portion (432) is located on the outer side of the shell (100).

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