Contactor with switching mechanism
By designing a contactor with a switching mechanism in the contactor, and using the parallel coil and mechanical switching mechanism, the energy consumption and damage risk of traditional contactors when starting and maintaining the coil is operated, achieving higher arc extinguishing and loading capacity, lower production costs and higher reliability.
Patent Information
- Application Number
- CN202420548450.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-20
AI Technical Summary
When the starter coil and the holding coil are working at the same time, the power is high and the moving contact assembly is moving at a fast speed, resulting in a large impact force between the moving and fixed iron cores, increasing the risk of damage; when the keeper coil works alone, the power is small and the movement speed is slow, which reduces the arc extinguishing and loading capacity. At the same time, the coil energy consumption increases, and the temperature rise is significantly improved, exceeding the product temperature resistance level.
A contactor with a switching mechanism is designed. By connecting the starter coil and the holding coil in parallel, the auxiliary switch and the starting coil are connected in series, the driving plate is used to drive the push card to disconnect the auxiliary switch, the starter coil stops working, and the coil is kept working alone. A mechanical switching mechanism is used to replace the circuit board to avoid failures caused by component failure.
It realizes that when keeping the coil working alone, the moving speed and impact force of the moving contact assembly are reduced, reducing the risk of damage and energy consumption, while improving the arc extinguishing and loading capacity, reducing production costs, and improving the reliability and application of the product.
Smart Images
Figure CN222672917U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of switching of starting coils of contactors, in particular to a contactor with a switching mechanism. Background Art
[0002] If the traditional contactor adopts the mode of starting coil and holding coil working at the same time, the power is large and the moving contact component moves faster, but it will cause the impact force between the moving and fixed iron cores to be large when they are in contact and attracted, increasing the risk of damage and consuming more energy. If the holding coil works alone, the power is small and the moving contact component moves slower, making it impossible to set a larger contact spacing in the main circuit, thereby reducing the arc extinguishing and load carrying capacity. In addition, with the increasing power of electric energy transmission, the power requirements for the coils in DC contactors are also increasing, resulting in increased coil energy consumption and significantly increased coil temperature rise, exceeding the product temperature resistance level. The existing DC contactors use PWM to directly reduce the coil voltage or use PCBA to switch the starting coil. Although these two methods can solve the above technical problems, they cannot avoid the use of circuit boards, resulting in complex circuit structures and poor applicability, and will increase the production cost of the contactor. In addition, during use, the IC and MOS tubes on the circuit board frequently fail, seriously affecting product reliability. Utility Model Content
[0003] The utility model aims to provide a contactor with a switching mechanism to solve the above-mentioned technical problems.
[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows: a contactor with a switching mechanism, comprising a magnetic circuit component, a moving contact component, a switching mechanism and a shielding shell, the magnetic circuit component comprising a coil frame and a coil wound on the coil frame, the coil comprising a starting coil and a holding coil connected in parallel with each other, a central hole is opened inside the coil frame, a fixed iron core is installed in the central hole, the moving contact component comprises a movable push rod penetrating the central hole of the coil frame and a moving iron core and a moving contact bridge fixedly installed at the head and the end of the movable push rod respectively, an elastic member is provided on the outer sleeve of the movable push rod, a chamber is enclosed between the shielding shell and the magnetic circuit component, the end of the movable push rod penetrates into the chamber, a static contact corresponding to the moving contact bridge is installed in the chamber, the switching mechanism comprises a driving sheet, a pushing card and an auxiliary switch, a through hole is opened on the side wall of the shielding shell, the pushing card is penetrated in the through hole, the auxiliary switch is arranged outside the side wall of the shielding shell and is connected to the outer end of the pushing card, the auxiliary switch is connected in series with the starting coil, the driving sheet is installed at the end of the movable push rod, and the driving sheet is used to drive the pushing card to move outward to control the auxiliary switch to be disconnected.
[0005] Preferably, a first terminal, a second terminal and a common terminal are installed on the outside of the shielding shell, the two ends of the holding coil are respectively connected to the first terminal and the common terminal, the two ends of the starting coil are respectively connected to the second terminal and the common terminal, the two ends of the auxiliary switch are electrically connected between the first terminal and the second terminal, and the common terminal and the first terminal are used to connect to an external power supply.
[0006] Preferably, when the coil is energized, the moving contact assembly overcomes the elastic force of the elastic member and moves downward, causing the moving iron core, movable push rod, drive plate, and moving contact bridge to move downward together. When the moving iron core and the fixed iron core are about to be attracted and the main circuit composed of the moving contact bridge and the static contact member is closed, the drive plate drives the push card to move outward, causing the auxiliary switch to be disconnected, the starting coil to stop working, and the coil to keep working alone. After that, the moving iron core continues to move downward and is attracted to the fixed iron core.
[0007] Preferably, the auxiliary switch is a movable reed with elastic deformation capability, a movable contact is provided at the end of the movable reed for active connection with the static contact on the second terminal, and the outer side of the push card is connected to one end of the movable reed close to the movable contact.
[0008] Preferably, the inner side of the pushing card is an inclined surface, which is inclined from top to bottom and gradually inclined toward one end of the driving plate. The driving plate includes a horizontal section and an inclined section. The horizontal section is fixedly mounted on the movable push rod. The inclined section is located at one end of the horizontal section close to the pushing card and gradually inclined upward toward the direction of the pushing card.
[0009] Preferably, the push card is an insulating push card.
[0010] Preferably, the magnetic circuit assembly includes a yoke, a magnetic circuit pressure plate and a magnetic conductive ring. The moving iron core and the fixed iron core are located in the center hole. The moving iron core is fixedly installed at the head end of the movable push rod. A clearance hole is opened on the yoke. The end of the movable push rod passes through the clearance hole into the chamber. The two ends of the magnetic circuit pressure plate are riveted to the top two ends of the yoke, and the coil frame is clamped and fixed between the yoke and the magnetic circuit pressure plate.
[0011] Preferably, an upper limit step is formed at the upper portion of the center hole, a lower limit step is formed at the lower portion of the center hole, the magnetic ring is clamped and fixed between the magnetic circuit pressure plate and the upper limit step, and the fixed iron core is clamped and fixed between the yoke and the lower limit step.
[0012] Preferably, the elastic member includes a return spring and a contact spring, the return spring is sleeved on the outside of the movable push rod between the moving iron core and the yoke, a blocking ring wall is formed on the outer periphery of the movable push rod located on the side of the yoke facing the moving contact bridge, and the contact spring is sleeved on the outside of the movable push rod between the blocking ring wall and the moving contact bridge.
[0013] The utility model has the following beneficial effects:
[0014] (1) The utility model connects the starting coil and the holding coil in parallel, and the auxiliary switch and the starting coil in series. The auxiliary switch is arranged on the outside of the side wall of the shielding shell and is connected to the outer end of the push card. The drive plate is installed at the end of the movable push rod. When the coil is energized, the moving contact assembly overcomes the elastic force of the elastic member and moves downward, so that the moving iron core, the movable push rod, the drive plate, and the moving contact bridge move downward together. The first movement stage is defined as the time before the moving iron core and the fixed iron core are close to being attracted and the main circuit composed of the moving contact bridge and the static contact is closed. The drive plate drives the push card to move outward, so that the auxiliary switch is disconnected, the starting coil stops working, and the holding coil works alone. After that, the moving iron core continues to move downward and is attracted to the fixed iron core as the second movement stage. The holding coil maintains the closed state of the magnetic circuit. The mechanical switching method of the switching mechanism does not require the use of a circuit board in the contactor, thereby eliminating the risk of contactor failure caused by failure of components on the circuit board, and reducing the production cost of the contactor. The switching reliability is high and the applicability is good. The overall structure is simpler, the spatial layout is more reasonable and compact, which is conducive to the miniaturized design of the product.
[0015] (2) In the first movement stage, the starting coil and the holding coil are connected in parallel and work simultaneously, the power is large, and the movement and response speed of the moving contact component is fast. In the second movement stage, the starting coil stops working and the holding coil works alone, so that the movable rod continues to move downward to form the end of the overtravel. The moving and fixed iron cores are close enough and the moving contact component has enough speed to form inertia, thereby reducing the movement speed of the end of the moving iron core, reducing the impact force between the moving iron core and the fixed iron core, and reducing the risk of damage. At this time, the holding coil alone can complete the final closure and maintain the closed state, which is more energy-saving and power-saving. In addition, this solution makes the starting coil work for a short time and with high power, so that the main circuit can be set with a larger contact spacing, thereby improving arc extinguishing and load-carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a front view of an embodiment of the utility model;
[0017] Figure 2 It is a side view of an embodiment of the utility model;
[0018] Figure 3 yes Figure 1 Sectional view at AA in the middle;
[0019] Figure 4 yes Figure 1 Sectional view at the middle BB;
[0020] Figure 5 yes Figure 2 Sectional view at CC;
[0021] Figure 6 It is a circuit principle diagram of an embodiment of the utility model.
[0022] The accompanying drawings are marked with: 1 starting coil, 2 holding coil, 3 moving iron core, 4 fixed iron core, 5 movable push rod, 6 blocking ring wall, 7 yoke, 8 magnetic circuit pressure plate, 9 magnetic conductive ring, 10 shielding shell, 11 driving plate, 111 horizontal section, 112 inclined section, 12 chamber, 13 pushing card, 131 inclined surface, 14 moving contact bridge, 15 static contact, 16 auxiliary switch, 17 coil frame, 171 center hole, 172 upper limit step, 173 lower limit step, 18 return spring, 19 contact spring, 20 first terminal, 21 second terminal, 22 common terminal. DETAILED DESCRIPTION
[0023] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0024] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] See also Figure 1-6As shown, as an embodiment of the utility model, a contactor with a switching mechanism is provided, including a magnetic circuit component, a moving contact component, a switching mechanism and a shielding shell 10, the magnetic circuit component includes a coil frame 17 and a coil wound on the coil frame 17, the coil includes a starting coil 1 and a holding coil 2 connected in parallel, a center hole 171 is opened inside the coil frame 17, a fixed iron core 4 is installed in the center hole 171, the moving contact component includes a movable push rod 5 penetrating the center hole 171 of the coil frame 17 and a moving iron core 3 and a moving contact bridge 14 fixedly installed at the head and end of the movable push rod 5, an elastic member is arranged on the outer cover of the movable push rod 5, and the shielding shell 10 is provided with a plurality of movable push rods. A chamber 12 is formed between the shielding shell 10 and the magnetic circuit component, and the end of the movable push rod 5 passes through the chamber 12. A static contact 15 corresponding to the moving contact bridge 14 is installed in the chamber 12. The switching mechanism includes a driving plate 11, a pushing card 13 and an auxiliary switch 16. A through hole is opened on the side wall of the shielding shell 10, and the pushing card 13 is arranged in the through hole. The auxiliary switch 16 is arranged outside the side wall of the shielding shell 10 and is connected to the outer end of the pushing card 13. The auxiliary switch 16 is connected in series with the starting coil 1. The driving plate 11 is installed at the end of the movable push rod 5. The driving plate 11 is used to drive the pushing card 13 to move outward to control the auxiliary switch 16 to disconnect.
[0027] Specifically, a first terminal 20, a second terminal 21 and a common terminal 22 are installed on the outer side of the shielding shell 10, the two ends of the holding coil 2 are respectively connected to the first terminal 20 and the common terminal 22, the two ends of the starting coil 1 are respectively connected to the second terminal 21 and the common terminal 22, the two ends of the auxiliary switch 16 are electrically connected between the first terminal 20 and the second terminal 21, and the common terminal 22 and the first terminal 20 are used to connect to an external power supply.
[0028] The utility model has the following advantages:
[0029] (1) The utility model connects the starting coil 1 and the holding coil 2 in parallel, and the auxiliary switch 16 is connected in series with the starting coil 1. The auxiliary switch 16 is arranged outside the side wall of the shielding shell 10 and connected to the outer end of the push card 13. The drive plate 11 is installed at the end of the movable push rod 5. Before the coil is energized, the magnetic circuit is in an open state. The push card 13 is pressed by the auxiliary switch 16 outside the chamber 12 to be in a starting end position close to the inside. The auxiliary switch 16 of the auxiliary circuit is in a closed state. When the coil is energized, the starting coil 1 and the holding coil 2 are connected in parallel and work at the same time. The resistance is small, the current is large, and a large magnetic force is generated. The moving contact component overcomes the elastic force of the elastic member and moves downward, so that the moving iron core 3. The movable push rod 5, the driving plate 11, and the moving contact bridge 14 move downward together, which is defined as the first movement stage when the main circuit composed of the moving contact bridge 14 and the static contact 15 is closed before the moving iron core 3 and the fixed iron core 4 are close to the suction. The driving plate 11 drives the push card 13 to move outward and push it out, so that the auxiliary switch 16 is disconnected, the starting coil 1 stops working, and the holding coil 2 works alone. After that, the moving iron core 3 continues to move downward and is attracted to the fixed iron core 4 as the second movement stage, and the holding coil 2 maintains the closed state of the magnetic circuit until the input of the control coil is disconnected, and the elastic member elastically resets upward, so that the moving iron core 3 moves upward and separates from the fixed iron core 4, and then the magnetic circuit is in a disconnected state. The mechanical switching method of the switching mechanism does not need to use a circuit board in the contactor, thereby eliminating the risk of contactor failure caused by failure of components on the circuit board, and reducing the production cost of the contactor. The switching reliability is high and the applicability is good; and the overall structure is simpler, the spatial layout is more reasonable and compact, which is conducive to the miniaturization design of the product.
[0030] (2) In the first movement stage, the starting coil 1 and the holding coil 2 are connected in parallel and work simultaneously, with high power, and the movement and response speed of the moving contact component is fast. In the second movement stage, the starting coil 1 stops working and the holding coil 2 works alone, so that the movable rod continues to move downward to form the end of the overtravel. The moving and fixed iron cores 4 are close enough and the moving contact component has enough speed to form inertia, thereby reducing the movement speed of the end of the moving iron core 3, reducing the impact force between the moving iron core 3 and the fixed iron core 4, and reducing the risk of damage. At this time, the holding coil 2 alone can complete the final closure and maintain the closed state, which is more energy-saving and power-saving. In addition, this solution makes the starting coil work for a short time and with high power. Specifically, the starting coil works for about 10 to 20 ms. The contactor is a 200A product, the starting coil power is 40W, and the holding coil power is 4W. The starting coil power is 10 times that of the holding coil power, which enables the main circuit to set a larger contact spacing, thereby improving the arc extinguishing and load-carrying capacity.
[0031] In this embodiment, the auxiliary switch 16 is a movable spring with elastic deformation capability, and a movable contact is provided at the end of the movable spring for active connection with the static contact on the second terminal 21, so that the contact accuracy is higher. The outer side of the push card 13 is connected to one end of the movable spring close to the movable contact, so that the push card 13 is easier and more labor-saving when pushing the auxiliary switch 16 to disconnect, thereby reducing the power consumption of the product.
[0032] In this embodiment, the push card 13 is an insulating push card, which is made of non-conductive material, so that it can be insulated and isolated from the main circuit. The inner side of the push card 13 is an inclined surface 131, and its inclination direction is from top to bottom and gradually inclines toward one end of the drive plate 11. The drive plate 11 includes a horizontal section 111 and an inclined section 112. The horizontal section 111 is fixedly mounted on the movable push rod 5. The inclined section 112 is located at one end of the horizontal section 111 close to the push card 13 and gradually inclines upward toward the push card 13. This setting makes full use of the space inside the chamber 12, and through the oblique guide cooperation between the inclined section 112 and the inclined surface 131, the thrust of the drive plate 11 is vertically transmitted to the push card 13. The force transmission is more efficient and direct, and the space inside the chamber is fully utilized.
[0033] In this embodiment, the magnetic circuit assembly includes a yoke 7, a magnetic circuit pressure plate 8 and a magnetic conductive ring 9, the moving iron core 3 and the fixed iron core 4 are located in the center hole 171, the yoke 7 is provided with a clearance hole, the end of the movable push rod 5 passes through the clearance hole to the chamber 12, the two ends of the magnetic circuit pressure plate 8 are riveted to the two ends of the top of the yoke 7, the coil frame 17 is clamped and fixed between the yoke 7 and the magnetic circuit pressure plate 8, and the upper part of the center hole 171 is formed with an upper limit step 172, and the lower part of the center hole 171 is formed with a lower limit step 173 The magnetic ring 9 is clamped and fixed between the magnetic circuit pressure plate 8 and the upper limit step 172, and the fixed iron core 4 is clamped and fixed between the yoke 7 and the lower limit step 173. This arrangement makes it unnecessary for the fixed iron core 4 to be riveted to the yoke 7, and only the step structure of the center hole 171 is riveted to the magnetic circuit pressure plate 8 and the yoke 7 to achieve the fixed assembly of the coil frame 17, the fixed iron core 4, and the magnetic ring 9, which simplifies the structure of the fixed iron core 4, reduces the processing cost, and can improve the overall assembly efficiency and accuracy.
[0034] In this embodiment, the elastic member includes a return spring 18 and a contact spring 19. The return spring 18 is sleeved on the outside of the movable push rod 5 between the moving iron core 3 and the yoke 7. A blocking ring wall 6 is formed on the outer periphery of the movable push rod 5 located on the side of the yoke 7 facing the moving contact bridge 14. The contact spring 19 is sleeved on the outside of the movable push rod 5 between the blocking ring wall 6 and the moving contact bridge 14. This arrangement can increase the reset elastic force of the moving iron core 3 and the movable push rod 5 moving upward, thereby improving the disconnection efficiency between the moving contact bridge 14 and the static contact member 15.
[0035] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail, without departing from the spirit and scope of the present invention as defined in the appended claims, shall fall within the scope of protection of the present invention.
Claims
1. A contactor with a switching mechanism, characterized in that: It includes a magnetic circuit component, a moving contact component, a switching mechanism and a shielding shell. The magnetic circuit component includes a coil frame and a coil wound on the coil frame. The coil includes a starting coil and a holding coil connected in parallel. A center hole is opened inside the coil frame, and a fixed iron core is installed in the center hole. The moving contact component includes a movable push rod penetrating the center hole of the coil frame and a moving iron core and a moving contact bridge fixedly installed at the head and end of the movable push rod respectively. The movable push rod outer sleeve is provided with an elastic part. A chamber is enclosed between the shielding shell and the magnetic circuit component. The end of the movable push rod penetrates into the chamber, and a static contact corresponding to the moving contact bridge is installed in the chamber. The switching mechanism includes a driving plate, a pushing card and an auxiliary switch. A through hole is opened on the side wall of the shielding shell. The pushing card is penetrated in the through hole. The auxiliary switch is arranged outside the side wall of the shielding shell and is connected to the outer end of the pushing card. The auxiliary switch is connected in series with the starting coil. The driving plate is installed at the end of the movable push rod. The driving plate is used to drive the pushing card to move outward to control the auxiliary switch to be disconnected.
2. The contactor with a switching mechanism according to claim 1, characterized in that: A first terminal, a second terminal and a common terminal are installed on the outside of the shielding shell, the two ends of the holding coil are respectively connected to the first terminal and the common terminal, the two ends of the starting coil are respectively connected to the second terminal and the common terminal, the two ends of the auxiliary switch are electrically connected between the first terminal and the second terminal, and the common terminal and the first terminal are used to connect to an external power supply.
3. The contactor with a switching mechanism according to claim 1, characterized in that: When the coil is energized, the moving contact assembly overcomes the elastic force of the elastic part and moves downward, causing the moving iron core, movable push rod, drive plate, and moving contact bridge to move downward together. When the moving iron core and the fixed iron core are about to be attracted and the main circuit composed of the moving contact bridge and the static contact is closed, the drive plate drives the push card to move outward, causing the auxiliary switch to be disconnected, the starting coil to stop working, and the coil to keep working alone. After that, the moving iron core continues to move downward and is attracted to the fixed iron core.
4. The contactor with a switching mechanism according to claim 1, characterized in that: The auxiliary switch is a movable spring with elastic deformation capability, the end of which is provided with a movable contact for movably connecting with the static contact on the second terminal, and the outer side of the push card is connected to one end of the movable spring close to the movable contact.
5. The contactor with a switching mechanism according to claim 1, characterized in that: The inner side of the push card is an inclined surface, which inclines from top to bottom and gradually inclines toward one end of the driving plate. The driving plate includes a horizontal section and an inclined section. The horizontal section is fixedly mounted on the movable push rod. The inclined section is located at one end of the horizontal section close to the push card and gradually inclines upward toward the push card.
6. The contactor with a switching mechanism according to claim 1, characterized in that: The push card is an insulated push card.
7. The contactor with a switching mechanism according to claim 1, characterized in that: The magnetic circuit assembly includes a yoke, a magnetic circuit pressure plate and a magnetic conductive ring. The moving iron core and the fixed iron core are located in the center hole. The moving iron core is fixedly installed at the head end of the movable push rod. A clearance hole is opened on the yoke. The end of the movable push rod passes through the clearance hole into the chamber. The two ends of the magnetic circuit pressure plate are riveted to the top two ends of the yoke, and the coil frame is clamped and fixed between the yoke and the magnetic circuit pressure plate.
8. The contactor with a switching mechanism according to claim 7, characterized in that: An upper limit step is formed on the upper part of the center hole, a lower limit step is formed on the lower part of the center hole, the magnetic ring is clamped and fixed between the magnetic circuit pressure plate and the upper limit step, and the fixed iron core is clamped and fixed between the yoke iron and the lower limit step.
9. The contactor with a switching mechanism according to claim 7, characterized in that: The elastic part includes a return spring and a contact spring. The return spring is sleeved on the outside of the movable push rod between the moving iron core and the yoke. A blocking ring wall is formed on the outer periphery of the movable push rod located on the side of the yoke facing the moving contact bridge. The contact spring is sleeved on the outside of the movable push rod between the blocking ring wall and the moving contact bridge.