A multifunctional contactor

Abstract

The present application relates to the technical field of contactor, disclose a kind of multifunctional contactor, including upper shell and the base of being clamped with upper shell, movable support, moving iron core, coil support, coil winding, static iron core are arranged from top to bottom in upper shell and base, wherein coil support, coil winding and static iron core are fixed in base, coil support is set on static iron core, return spring is arranged between coil support and moving iron core, movable support is connected with moving iron core and slides in upper shell, movable support is parallelly provided with multiple movable contact point groups, and fixed contact point group is arranged on both sides of each movable contact point group.The multifunctional contactor, by the cooperation design of contact roller and semicircular arc groove, converts wire contact into surface contact, increases contact area, reduces on-resistance, reduces current loss;The combination of friction strip and inclined groove surface makes the contact roller produce slight rotation each time, avoids local excessive wear, prolongs the service life of contact point.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of contactors, in particular to a multifunctional contactor. BACKGROUND

[0002] A contactor is an electrical component that controls the on-off of a circuit using electromagnetic principles. It is composed of an electromagnetic system (coil, core) and a contact system. Through a small current control signal, the electromagnetic system is driven to act, driving the contacts to close or open, thereby indirectly controlling the main circuit of large current. It is widely used in the fields of electric power and industrial automation, and can frequently operate the circuit, with the functions of control and protection.

[0003] In the patent with the patent number CN118571709A, a contactor is disclosed, which includes a shell, a contact structure including a contact head assembly, a first electromagnetic assembly, and a drive shaft extending in a first direction. The contact head assembly includes a static contact head assembly and a moving contact head arranged in sequence along the first direction. The static contact head assembly is spaced apart from the drive shaft, and includes a first static contact and a second static contact arranged in sequence along the circumference of the drive shaft. The moving contact head and the first electromagnetic assembly are connected to the drive shaft in sequence, and the first electromagnetic assembly can drive the drive shaft to move in the first direction. A rotating structure is provided in the shell and is spaced apart from the contact structure, and includes a second electromagnetic assembly connected to the drive shaft. The second electromagnetic assembly can drive the drive shaft to rotate.

[0004] The existing technology has the following defects:

[0005] In the prior art, the contact point structure of the contactor is mostly in the form of simple linear contact or point contact, and the contact area is limited, resulting in a large contact resistance. When the current passes through, a large amount of heat is generated, which not only increases the energy consumption, but also accelerates the wear of the contact points. At the same time, the contact point contact part is fixed, and after long-term use, it is easy to appear indentation or deformation due to local excessive friction, which seriously affects the conductivity and service life.

[0006] In terms of attraction and retention, the traditional contactor relies on the continuous energization of the coil to generate electromagnetic force to maintain the attraction state. Not only is the power consumption high, but the long-term heating of the coil also accelerates the aging and shortens the overall life. Moreover, the alternating current contactor produces a continuous "hum" noise due to the pulsation of electromagnetic force, and the stability of the attraction state is poor in a vibrating environment. It is easy to be disturbed to cause the contact point to loosen, affecting the reliability of the circuit control. SUMMARY

[0007] In view of the above problems existing in the prior art, a multifunctional contactor is proposed.

[0008] In one aspect of the present application, a multifunctional contactor is provided, which aims to prolong the service life of the coil, eliminate the continuous action of the electromagnetic force, reduce the current loss, and prolong the service life of the contact point.

[0009] The technical scheme of the present application is: a multifunctional contactor, comprising an upper shell and a base connected with the upper shell, a movable support, a moving iron core, a coil support, a coil winding and a static iron core are arranged in the upper shell and the base from top to bottom, wherein the coil support, the coil winding and the static iron core are fixed in the base, the coil support is sleeved on the static iron core, a return spring is arranged between the coil support and the moving iron core, the movable support is connected with the moving iron core and slides in the upper shell, a plurality of movable contact point groups are arranged in parallel on the movable support, and a fixed contact point group is arranged on both sides of each movable contact point group.

[0010] The end sides of the movable contact point group are provided with symmetrical shaft supports, a support shaft is connected between the pair of shaft supports, a contact roller is rotatably arranged on the support shaft, the end of the fixed contact point group corresponding to the movable contact point group is provided with a contact pad, a semicircular arc groove is formed in the contact pad, and the semicircular arc groove is matched with the contact roller.

[0011] Further, an installation groove is arranged on the movable support, and a movable contact point spring is arranged in the installation groove, the movable contact point spring compresses the movable contact point group to the bottom of the installation groove.

[0012] Further, an arc-extinguishing cover is arranged at the end of each movable contact point group, and the cross section of the arc-extinguishing cover is shaped like a Chinese character.

[0013] Further, a folding air bag is arranged in the arc-extinguishing cover, an installation wall is arranged at the lower end surface of the folding air bag, the installation wall is connected with the movable contact point group, a hanging ear is arranged at the upper end surface of the folding air bag, a support piece is arranged on the inner wall of the arc-extinguishing cover, the hanging ear is arranged on the support piece, an air outlet pipe is connected with the upper end surface of the folding air bag, and the other end of the air outlet pipe extends to the fixed contact point group.

[0014] Further, the semicircular arc groove is arranged obliquely, and a friction strip is arranged at the highest point of the semicircular arc groove.

[0015] Further, an arc-shaped groove is arranged on the movable contact point group, and the arc-shaped groove is attached to the outer wall of the contact roller.

[0016] Further, a pin rod is arranged on the moving iron core, a hook rod is arranged on the pin rod, the hook rod has elasticity, a locking plate is arranged on the inner wall of the coil support, a right-angled triangular recess is arranged on the locking plate, an obtuse-angled triangular convex island is arranged in the right-angled triangular recess, a clamping groove is arranged at the lowermost side of the obtuse-angled triangular convex island, and a clamping rod is arranged at the corresponding position of the edge of the right-angled triangular recess and the clamping groove; when the coil winding is disconnected, the lower end of the hook rod is tightly attached to the longest side of the obtuse-angled triangular convex island; when the coil winding is connected, the lower end of the hook rod slides along the longest side of the obtuse-angled triangular convex island to the clamping groove.

[0017] Further, a support plate is arranged in the static iron core, and the support plate is clamped on the base.

[0018] Further, the moving iron core is provided with an elastic sheet, and the elastic sheet is connected with the movable support.

[0019] The present application has the following advantages:

[0020] 1. The small current control signal indirectly controls the large current main circuit based on the principle of electromagnet. The accurate butt joint of the movable contact group and the fixed contact group ensures the quick response of the main circuit and the stable and reliable basic control logic.

[0021] 2. The cooperation of the contact roller and the semicircular groove converts the line contact into the surface contact, increases the contact area, reduces the contact resistance and the current loss; the combination of the friction strip and the inclined groove surface makes the contact roller produce slight rotation each time, avoids the local excessive wear and prolongs the service life of the contact.

[0022] 3. The mechanical locking structure of the hook rod and the locking plate does not need the continuous power supply of the coil after the attraction, significantly reduces the maintenance power consumption and heat generation, prolongs the service life of the coil; gets rid of the continuous action of the electromagnetic force, eliminates the alternating "hum" noise of the traditional contactor, and at the same time, the rigid connection of the mechanical lock improves the anti-vibration ability and ensures the stability of the attraction state. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a perspective view of the multifunctional contactor of the present application;

[0024] Figure 2 It is a front view of the multifunctional contactor of the present application;

[0025] Figure 3 It is a perspective view of the multifunctional contactor of the present application; Figure 2 It is a sectional view of A-A;

[0026] Figure 4 It is an exploded view of the multifunctional contactor of the present application;

[0027] Figure 5 It is another view of the multifunctional contactor of the present application; Figure 4

[0028] Figure 6 It is a sectional view of the folding air bag in the multifunctional contactor of the present application;

[0029] Figure 7 It is a perspective view of the folding air bag in the multifunctional contactor of the present application;

[0030] Figure 8 It is a perspective view of the movable contact group in the multifunctional contactor of the present application;

[0031] Figure 9 It is a perspective view of the moving iron core, the coil support, the coil winding and the static iron core in the multifunctional contactor of the present application;

[0032] ​Figure 10 Figure 1 is a top view of the movable iron core, coil support, coil winding, and static iron core in the multifunctional contactor of the present application;

[0033] Figure 11 Figure 1 is a top view of the movable iron core, coil support, coil winding, and static iron core in the multifunctional contactor of the present application; Figure 10 Figure 1 is a top view of the movable iron core, coil support, coil winding, and static iron core in the multifunctional contactor of the present application;

[0034] Figure 12 Figure 1 is a top view of the movable iron core, coil support, coil winding, and static iron core in the multifunctional contactor of the present application; Figure 11 Figure 1 is a top view of the movable iron core, coil support, coil winding, and static iron core in the multifunctional contactor of the present application;

[0035] Figure 1 is a top view of the movable iron core, coil support, coil winding, and static iron core in the multifunctional contactor of the present application;

[0036] 1, upper shell; 2, base; 3, movable support; 4, movable iron core; 5, coil support; 6, coil winding; 7, static iron core; 8, return spring; 9, movable contact group; 10, fixed contact group; 11, mounting groove; 12, movable contact spring; 13, arc extinguishing cover; 14, folding air bag; 15, mounting wall; 16, hanging ear; 17, support piece; 18, air outlet pipe; 19, shaft support; 20, support shaft; 21, contact roller; 22, contact pad; 23, semicircular groove; 24, friction strip; 25, arc-shaped groove; 26, pin rod; 27, hook rod; 28, locking plate; 29, right-angled triangular recess; 30, obtuse-angled triangular convex island; 31, clamping groove; 32, clamping rod; 33, support plate; 34, elastic sheet. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0038] Embodiment 1, refer to Figures 1-5 , the first embodiment of the present application, including the upper shell 1 and the base 2 clamped with the upper shell 1, the upper shell 1 and the base 2 together form a closed mounting space, inside from top to bottom are sequentially provided with movable support 3, movable iron core 4, coil support 5, coil winding 6, static iron core 7. Among them, the coil support 5, the coil winding 6 and the static iron core 7 are fixed in the base 2 by clamping or tight fit, the coil support 5 is in the form of a cylinder and is externally provided on the static iron core 7, the coil support 5 and the movable iron core 4 are provided with a return spring 8, one end of the spring is abutted on the top of the coil support 5, the other end is abutted with the movable iron core 4, which provides the movable iron core 4 with a reset elastic force. The movable support 3 is fixedly connected with the movable iron core 4 through a connecting piece, and can slide up and down along the guide structure inside the upper shell 1, the movable support 3 is provided with a plurality of movable contact groups 9 in parallel, each movable contact group 9 is composed of movable contact pieces connected with each other, and the two sides are provided with fixed contact groups 10 correspondingly, the fixed contact groups 10 are fixed on the inner wall of the upper shell 1 through an insulating support, and are stably connected with the external circuit.

[0039] Refer to Figures 3-4The movable bracket 3 is provided with a mounting groove 11, and a movable contact spring 12 is provided in the mounting groove 11. The movable contact spring 12 presses the movable contact group 9 tightly against the bottom of the mounting groove 11. The movable contact spring 12 provides continuous downward pressure to the movable contact group 9. After the movable contact group 9 and the fixed contact group 10 are closed, it ensures that the contacts are in close contact and avoids the generation of electric sparks.

[0040] Reference Figures 3-4 Each movable contact group 9 is provided with an arc extinguishing cover 13 at its end. The arc extinguishing cover 13 has a U-shaped cross section. The end of the movable contact group 9 extends into the arc extinguishing cover 13 from one side of the arc extinguishing cover 13 opening. A hole is opened on the other side of the arc extinguishing cover 13, and the fixed contact group 10 extends into the arc extinguishing cover 13 through the hole.

[0041] Reference Figure 3 A support plate 33 is inserted inside the stationary iron core 7. The support plate 33 is engaged with the base 2 and serves to fix the stationary iron core 7.

[0042] Reference Figure 3 A spring piece 34 is inserted inside the moving iron core 4. The spring piece 34 is connected to the movable bracket 3, which serves to connect the moving iron core 4 to the movable bracket 3.

[0043] The working principle of this embodiment is as follows: When a small current control signal is applied to the coil winding 6, the coil winding 6 and the stationary iron core 7 together form an electromagnet. The magnetic force generated by the stationary iron core 7 overcomes the elastic force of the return spring 8 and attracts the moving iron core 4 to move downward. The moving iron core 4 drives the movable bracket 3 and its movable contact group 9 to move downward synchronously, so that the movable contact group 9 makes precise contact with the fixed contact groups 10 on both sides, thereby connecting the originally disconnected fixed contact groups 10. This realizes the indirect control of the large current main circuit by using a small current control signal. When the coil winding 6 is de-energized, the magnetic force of the electromagnet disappears, the elastic force of the return spring 8 pushes the moving iron core 4 upward, the movable bracket 3 returns to its original position with the moving iron core 4, the movable contact group 9 separates from the fixed contact group 10, and the main circuit is disconnected. The whole process is responsive and reliable.

[0044] Example 2, refer to Figures 6-9For the second embodiment of the application, which is different from the first embodiment, the arc-extinguishing cover 13 is provided with a folding air bag 14 made of temperature-resistant elastic material, which has an accordion-like pleated structure and good stretching performance. When subjected to pressure, the longitudinal height of the folding air bag 14 can be greatly reduced, and it can naturally stretch back to its original position when released. The lower end surface of the folding air bag 14 is integrally formed with an open ring-shaped mounting wall 15, which is fixedly connected to the top of the movable contact group 9 by buckling or bolting, and moves synchronously with the vertical movement of the movable contact group 9, thereby controlling the expansion and folding of the folding air bag 14. The upper end surface edge of the folding air bag 14 is provided with a hanging ear 16, and the corresponding height of the inner wall of the arc-extinguishing cover 13 is horizontally provided with a support piece 17 adapted to the hanging ear 16. The support piece 17 is provided with a limiting groove matched with the hanging ear 16, and the hanging ear 16 is fitted in the limiting groove to limit the movement of the folding air bag 14, so that the upper end of the folding air bag 14 is always fixed. The upper end surface of the folding air bag 14 is also connected to an air outlet pipe 18 made of hard temperature-resistant pipe material, one end of which is in communication with the inside of the folding air bag 14, and the other end extends to the vicinity of the contact point of each fixed contact group 10 in a bifurcated manner, and forms a flat air outlet at the pipe opening.

[0045] Referring to Figure 8 The ends of the movable contact group 9 are integrally formed with symmetrical shaft supports 19, which are opposite to each other. A shaft hole is formed in the corresponding position of the pair of shaft supports 19, and a support shaft 20 is fitted in the shaft hole. The support shaft 20 and the shaft hole are in clearance fit, so that the support shaft 20 can rotate flexibly. A contact roller 21 is fitted on the middle part of the support shaft 20. The inner wall of the contact roller 21 is tightly fitted with the support shaft 20, and can rotate synchronously with the support shaft 20. The outer wall of the contact roller 21 is made of a material with excellent electrical conductivity and is smooth.

[0046] The end of the fixed contact group 10 corresponding to the movable contact group 9 is fixedly provided with a contact pad 22 by riveting or welding. The contact pad 22 is made of a high-temperature-resistant alloy material with good electrical conductivity. A semicircular arc groove 23 is formed on the side of the contact pad 22 facing the contact roller 21. The curvature of the semicircular arc groove 23 is completely matched with the outer wall of the contact roller 21. When the movable contact group 9 contacts the fixed contact group 10, the contact roller 21 can be precisely fitted into the semicircular arc groove 23, so that the contact surface of the two changes from linear contact to surface contact, thereby significantly increasing the contact area and effectively reducing the resistance when the circuit is closed and the heat loss when the current passes through.

[0047] The semicircular arc groove 23 is arranged in an inclined state, and the groove surface gradually rises from one end to the other end. At the highest point of the semicircular arc groove 23, a friction strip 24 is embedded along the length direction of the groove. The friction strip 24 is made of a wear-resistant conductive material with a hardness lower than that of the outer wall of the contact roller 21.

[0048] The working principle of the embodiment is as follows: when the movable contact group 9 separates from the fixed contact group 10, the movable contact group 9 moves upward under the action of the return spring 8, synchronously driving the mounting wall 15 to move upward. The mounting wall 15 extrudes the bottom surface of the folded air bag 14, so that the organ-like wrinkle structure is compressed upward. At this time, the gas in the folded air bag 14 is quickly extruded, and high-speed airflow is sprayed from the flat air outlet through the air outlet pipe 18. The airflow accurately hits the electric arc generated between the movable contact group 9 and the fixed contact group 10. The electric arc is not only lengthened and dispersed by the impact force of the airflow, but also the heat generated by the electric arc is taken away by the airflow, so that the electric arc is quickly extinguished and the temperature at the contact point is reduced, effectively reducing the ablation of the contact point by the electric arc and improving the service life and working safety of the contactor.

[0049] When the movable contact group 9 drives the contact roller 21 to move downward and contact the contact pad 22 of the fixed contact group 10, the contact roller 21 first contacts the higher semicircular arc groove 23. With the continuation of the downward movement, the contact roller 21 rolls upward along the inclined groove surface until it reaches the highest point and contacts the friction strip 24. Due to the friction of the friction strip 24, the contact roller 21 will rotate a small angle during this process. By producing this small rotation of the contact roller 21 each time the contact is made, the contact position of the contact roller 21 and the contact pad 22 can be evenly alternated, avoiding local over-wear due to long-term stress and friction, thereby prolonging the service life of the contact group and improving the stability of the contactor.

[0050] The remaining structure is the same as that of example 1.

[0051] Example 3, refer to Figures 10-12For the third embodiment of the present application, which is different from the second embodiment, a pin 26 is arranged in the interior of the moving iron core 4, and a hook rod 27 is connected to the side wall of the pin 26 by hinging or integral forming. The hook rod 27 is made of elastic metal material, and its free end is L-shaped, with elastic pre-tightening force bending to one side. Correspondingly, a locking plate 28 is vertically fixed to the inner wall of the coil support 5, and a right-angled triangle groove 29 is arranged on the side of the locking plate 28 facing the hook rod 27. The two right-angled sides of the right-angled triangle groove 29 are arranged along the vertical and horizontal directions respectively. Inside the right-angled triangle groove 29, an obtuse triangle convex island 30 is integrally formed. One long side of the convex island is parallel to the oblique side of the groove with a certain gap, and the other short side is inclined to the inner side of the groove. At the lowermost side of the obtuse triangle convex island 30, an inwardly recessed clamping groove 31 is arranged, and at the edge of the right-angled triangle groove 29 corresponding to the clamping groove 31, a clamping rod 32 is protruded to the inner side of the groove. The position of the clamping rod 32 is just able to form cooperation limiting with the hook end of the hook rod 27.

[0052] When the coil winding 6 is in the open circuit state, the hook end of the hook rod 27 is tightly attached to the longest side of the obtuse triangle convex island 30 under the action of its own elasticity, maintaining the initial standby state. When the coil winding 6 is in the closed circuit state, with the downward movement of the moving iron core 4, the hook rod 27 moves downward synchronously with the pin 26, and its hook end gradually slides along the longest side of the obtuse triangle convex island 30, and finally embeds into the clamping groove 31, forming locking with the clamping rod 32.

[0053] The cooperation structure of the hook rod 27 and the locking plate 28 constitutes a mechanical locking device, and the core action is that the end of the hook rod 27 slides along the edge of the obtuse triangle convex island 30, and is locked in the clamping groove 31 by single downward movement. When pressed again, it can be unlocked from the clamping groove 31 and reset.

[0054] The working principle of the present embodiment is as follows:

[0055] When the coil winding 6 is powered on, the electromagnetic force generated by the coil winding 6 drives the static iron core 7 to generate suction force, overcoming the elastic force of the return spring 8 to pull the moving iron core 4 downward to attract. In the process of the downward movement of the moving iron core 4, the hook rod 27 moves downward synchronously with the pin 26, and its hook end slides along the longest side of the obtuse triangle convex island 30, and at the same time, elastic deformation occurs due to the extrusion of the shape of the convex island. When the moving iron core 4 is attracted to the position, the hook end of the hook rod 27 is just slid into the clamping groove 31, and is clamped with the clamping rod 32 under the action of its own elasticity, forming a stable locking state.

[0056] After entering the holding state, the coil winding 6 can be immediately powered off. At this time, the attraction state of the contactor is no longer dependent on the electromagnetic force, but is continuously maintained by the physical locking structure of the mechanical lock, ensuring the stable connection of the main circuit.

[0057] The breaking process is: when the main circuit needs to be broken, only a short current pulse is applied to the coil winding 6. The electromagnetic force generated by the pulse drives the static iron core 7 again, overcomes the elastic force of the return spring 8, and makes the moving iron core 4 attract again. At the moment of this time, the hook rod 27 continues to move downward with the moving iron core 4, and the hook end is detached from the clamping groove 31, slides upward along the shorter side (inclined side) of the obtuse triangle convex island 30, and after being released from the constraint of the convex island, the hook rod 27 is reset to the initial position under the action of its own elasticity. As soon as the mechanical lock is released, the elastic force of the return spring 8 quickly pulls the moving iron core 4 back up, drives the movable support 3 and the movable contact group 9 to reset, and realizes the breaking of the main contact.

[0058] The advantages of the mechanical locking structure are: first, it can significantly reduce the maintenance power consumption and heat, and the coil does not need to be continuously powered after attraction, which fundamentally avoids the energy loss of the long-term power supply of the traditional contactor coil; second, it can eliminate the AC noise, because there is no continuous electromagnetic force pulsation, and the "hum" problem of the traditional AC contactor during operation is completely solved; third, it improves the vibration resistance, and the rigid connection of the mechanical lock can effectively resist external vibration interference and ensure the stability of the attraction state; fourth, it potentially prolongs the service life, greatly reduces the power-on time of the coil, reduces the aging speed of the coil caused by long-term heating, and improves the overall durability of the contactor.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A multi-functional contactor, comprising an upper housing (1) and a base (2) snapped into the upper housing (1), characterized in that: The upper housing (1) and the base (2) are provided with a movable bracket (3), a moving iron core (4), a coil bracket (5), a coil winding (6), and a stationary iron core (7) from top to bottom. The coil bracket (5), the coil winding (6), and the stationary iron core (7) are fixed inside the base (2). The coil bracket (5) is sleeved on the stationary iron core (7). A return spring (8) is provided between the coil bracket (5) and the moving iron core (4). The movable bracket (3) is connected to the moving iron core (4) and slides inside the upper housing (1). Multiple sets of movable contact groups (9) are arranged in parallel on the movable bracket (3). Each set of movable contact groups (9) has fixed contact groups (10) on both sides. The movable contact group (9) has symmetrical shaft frames (19) on both sides of its end. A support shaft (20) is connected between a pair of shaft frames (19). A contact roller (21) is rotatably mounted on the support shaft (20). A contact pad (22) is provided at the end of the fixed contact group (10) corresponding to the movable contact group (9). A semi-circular groove (23) is provided on the contact pad (22). The semi-circular groove (23) matches the contact roller (21). The moving iron core (4) is provided with a pin (26), and a hook (27) is provided on the pin (26). The hook (27) is elastic. The inner wall of the coil support (5) is provided with a locking plate (28). The locking plate (28) is provided with a right-angled triangular groove (29). The right-angled triangular groove (29) is provided with an obtuse-angled triangular protrusion (30). The lowest side of the obtuse-angled triangular protrusion (30) is provided with a slot (31). The edge of the right-angled triangular groove (29) is provided with a corresponding slot (31). When the coil winding (6) is broken, the lower end of the hook (27) is close to the longest side of the obtuse-angled triangular protrusion (30). When the coil winding (6) is in the circuit, the lower end of the hook (27) slides along the longest side of the obtuse-angled triangular protrusion (30) into the slot (31).

2. The multifunctional contactor according to claim 1, characterized in that: The movable bracket (3) is provided with a mounting groove (11), and a movable contact spring (12) is provided in the mounting groove (11). The movable contact spring (12) presses the movable contact group (9) against the bottom of the mounting groove (11).

3. The multifunctional contactor according to claim 1, characterized in that: Each movable contact group (9) is provided with an arc extinguishing cover (13) at its end, and the arc extinguishing cover (13) has a cross-section of U-shape.

4. The multifunctional contactor according to claim 3, characterized in that: The arc extinguishing cover (13) is provided with a folded airbag (14). The lower end face of the folded airbag (14) is provided with a mounting wall (15). The mounting wall (15) is connected to the movable contact group (9). The upper end face of the folded airbag (14) is provided with a hanging ear (16). The inner wall of the arc extinguishing cover (13) is provided with a support plate (17). The hanging ear (16) passes through the support plate (17). The upper end face of the folded airbag (14) is connected with an air outlet pipe (18). The other end of the air outlet pipe (18) extends to the fixed contact group (10).

5. The multifunctional contactor according to claim 1, characterized in that: The semi-circular groove (23) is inclined, and a friction strip (24) is provided at the highest point of the semi-circular groove (23).

6. The multifunctional contactor according to claim 1, characterized in that: The movable contact group (9) is provided with an arc groove (25), which is in contact with the outer wall of the contact roller (21).

7. The multifunctional contactor according to claim 1, characterized in that: The static iron core (7) is fitted with a support plate (33), which is engaged with the base (2).

8. The multifunctional contactor according to claim 1, characterized in that: The moving iron core (4) is provided with a spring piece (34), which is connected to the movable bracket (3).

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