CN211670146U - Contact device of integrated electronic switch - Google Patents

Abstract

The utility model discloses a contact device of an integrated electronic switch, which comprises a PCB component, a movable contact component, a fixed contact component, a driving structure and a magnetic component, wherein the PCB component, the movable contact component, the fixed contact component, the driving structure and the magnetic component are arranged on a switch shell; the static contact component comprises a static contact opposite to the moving contact, the magnetic part is arranged close to the position of a breaking opening between the moving contact and the static contact, the magnetic blow-out arc extinguishing effect is achieved, a flyback diode which is in parallel connection with the moving contact component and the static contact component is arranged on the PCB component, a backflow path is provided for the back electromotive force generated by starting and stopping the motor through the flyback diode, and therefore the electric elements on the contact device and the PCB component are protected, the back electromotive force generated by starting and stopping the motor can be overcome by the integrated electronic switch when the integrated electronic switch is frequently switched on and off, the integrated electronic switch is safe and reliable, and the service.

Description

Contact device of integrated electronic switch

Technical Field

The utility model relates to a switch technical field, concretely relates to integrated electronic switch's contact device.

Background

The integrated electronic switch is a switch which integrates a switch mechanical part and a circuit control system part and is used for controlling the electric tool to work, common electric tools comprise an electric drill, an electric grinding machine, an electric wrench, an electric hammer, an impact electric drill, a concrete vibrator, an electric planer and the like, and the functions of starting and stopping a motor and adjusting the rotating speed or the steering of the electric tool can be realized through the integrated control switch.

The switch mechanical part of the existing integrated electronic switch comprises a contact mechanism for breaking a switch working circuit, the contact mechanism mainly comprises a moving contact frame, a contact spring, a fixed contact and a moving contact, the fixed contact and the moving contact frame are respectively arranged on a PCB inside the switch and are connected with a conductive loop on the PCB, the moving contact is rotatably arranged on the moving contact frame, a driving frame for driving the moving contact to be in contact with or separated from the fixed contact is further arranged in the integrated electronic switch, and the switch still has the following problems when in frequent on-off operation: 1. the back electromotive force is generated when the motor is controlled to start and stop by the on-off of the contact mechanism, electric sparks are caused between contacts of the switch by the accumulated potential difference, the contacts are ablated, electrical elements on a PCB (printed circuit board) can be damaged, arc discharge can be generated when the moving contact and the static contact are disconnected, the contacts are burnt, and the contacts are seriously burnt, so that the service lives of the contact mechanism and the switch are influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming among the prior art integrated electronic switch's contact device control motor and opening the back electromotive force that produces when opening and stop can cause the harm to the electric elements on contact and the PCB board to and move, the static contact divides the arc phenomenon that draws that produces to lead to the fact the firing to the contact, the contact can be burnt out seriously, thereby influence contact mechanism and switch life's problem.

In order to solve the technical problem, the utility model provides an integrated electronic switch's contact device installs in the switch casing and links to each other with PCB board part, include:

the moving contact component comprises a moving contact frame fixedly connected to the PCB component and a moving contact rotatably arranged on the moving contact frame;

the fixed contact assembly is fixedly connected to the PCB component and comprises a fixed contact opposite to the moving contact;

the driving structure is connected with the moving contact and is used for driving the moving contact to be in contact with or separated from the fixed contact;

the magnetic component is arranged in the switch shell close to a breaking opening between the moving contact and the fixed contact;

and the flyback diode is arranged on the top surface of the PCB component and is connected between the movable contact component and the fixed contact component in parallel.

As a preferable scheme, an installation slot is arranged in the switch housing and is positioned below the breaking opening, and the magnetic part is a magnet structure inserted in the installation slot.

As a preferred scheme, the fixed contact assembly includes a conductive plate connected to the fixed contact, and the conductive plate and the movable contact frame are respectively connected to the PCB board component.

As a preferred scheme, a first pin is formed on the movable contact frame, a second pin is formed on the conductive plate, two insertion holes which are matched and connected with the first pin and the second pin are arranged on the PCB part, and two ends of the flyback diode are respectively connected with the first pin of the movable contact frame and the second pin of the conductive plate.

Preferably, the PCB board component is further provided with a copper plate extending to the insertion hole, and the copper plate is connected to the first pin or the second pin inserted into the insertion hole.

As a preferred scheme, the driving structure includes a contact spring that applies a biasing force to the moving contact to rotate towards one side of the fixed contact, a driving frame that is disposed on the switch housing in a reciprocating manner, and two protruding structures that are disposed on the driving frame side by side in a high-low manner, two moving contacts and two fixed contacts are respectively and correspondingly disposed, one ends of the two moving contacts respectively rotate under the biasing force of the contact spring to abut against the two protruding structures, and when the driving frame drives the two protruding structures to reciprocate, the two moving contacts and the two fixed contacts respectively contact or separate in sequence.

As a preferred scheme, the two protruding structures are a first protruding block and a second protruding block protruding towards one side of the two moving contacts respectively, the bottoms of the first protruding block and the second protruding block are flush, and the top of the first protruding block is provided with a yielding groove structure.

As a preferable scheme, two contact springs are arranged at the other ends of the two movable contacts, one end of each contact spring abuts against the side surface of each movable contact, which is opposite to the corresponding fixed contact, and the other end of each contact spring abuts against an inner wall plate formed by the shell.

Compared with the prior art, the technical scheme of the utility model have the following advantage:

1. the utility model provides an among the integrated electronic switch's contact device, be provided with on the PCB board with the movable contact subassembly with the static contact subassembly have the flyback diode of parallel relation, when motor start-stop produces back electromotive force, provide the backward flow route for back electromotive force through flyback diode, release back electromotive force through flyback diode with the form of electric current, play the steady voltage effect, thereby protected the electrical element on contact mechanism and PCB board part, and, through setting up the magnetic part in the branch mouth department of moving contact, static contact is made to the action of magnetic field with the help of the magnetic part makes the electric arc that the branch produced lengthen and cool off, play the effect of magnetic blow-out arc extinguishing, reduce the injury of electric arc to the contact, adopt this technical scheme, integrated electronic switch can effectively overcome the back electromotive force that motor start-stop produced when frequently operating, safe and reliable, thereby improving the service life of the contact device and the switch.

2. The utility model provides an among the contact device of integrated electronic switch, set up according to two protruding structures are adjacent not the same height on the drive frame, therefore when pressing the drive frame and moving down, two protruding structures correspond the stepping sequence of two moving contacts different, make two moving contacts and two protruding structure cooperation action order also be in the same place afterwards, namely under the driving of moving contact spring, make moving contact and static contact put through earlier among them, then make another moving contact and static contact put through later, these two groups of movements that put through successively, the static contact is in the parallel relation on the circuit, because the switch just put through can produce a bigger surge current through the contact, the contact that put through earlier can bear bigger current, the contact that put through later shunts partial current, and effectively reduced the contact temperature rise, design can share the surge current better in order to avoid the frequent break-make-and-break of switch to cause the damage to the contact mechanism like this, the service life of the switch is prolonged.

3. The utility model provides an among the contact device of integrated electronic switch, breach groove structure has been seted up at first lug top to reduced the height of first lug, made first lug be less than the setting of second lug, the benefit of design like this lies in, when the carriage drive sliding seat moves down, makes this moving contact that contacts to breach groove structure switch on with corresponding static contact earlier, and then makes another moving contact switch on behind another moving contact and the static contact that corresponds again; and when the driving frame drives the sliding seat to reset and move upwards, the disconnection sequence of the two moving contacts and the two static contacts is reversed, namely the moving contacts in the gap groove structure are disconnected, so that the connection and disconnection sequence between the moving contacts and the static contacts is reasonably and orderly carried out, and the matching is reliable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a contact device of an integrated electronic switch according to the present invention;

fig. 2 is a perspective view of the contact arrangement of fig. 1;

fig. 3 is a schematic perspective view of the integrated electronic switch of the present invention;

fig. 4 is a schematic view of a split structure of the integrated electronic switch of the present invention;

fig. 5 is a schematic plan view of the PCB board assembly of the present invention;

description of reference numerals: 1-switch shell, 10-slot structure, 11-closed cavity, 12-open cavity, 2-sealing cover, 3-PCB board component, 31-flyback diode, 32-jack, 33-copper plate, 4-power switch, 61-contact rack, 611-first pin, 62-moving contact, 63-static contact, 64-conducting plate, 641-second pin, 65-convex structure, 651-first bump, 652-second bump, 653-abdicating slot structure, 66-magnetic component, 7-driving structure, 71-driving rack, 72-contact spring, 73-button component and 74-reset spring.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

Example 1

The present embodiment is described in detail below with reference to the accompanying drawings:

the present embodiment provides a contact arrangement of an integrated electronic switch as shown in fig. 1-5, mounted in a switch housing 1 and connected to a PCB board member 3, comprising:

the moving contact component comprises a moving contact frame 61 fixedly connected to the PCB component 3 and a moving contact 62 rotatably arranged on the moving contact frame 61;

the fixed contact component is fixedly connected to the PCB component 3 and comprises a fixed contact 63 opposite to the movable contact;

the driving structure 7 is connected with the moving contact 62 and used for driving the moving contact 62 to be in contact with or separated from the fixed contact 63;

a magnetic component 66 mounted in the switch housing 1 near a breaking opening between the moving contact 62 and the fixed contact 63;

and the flyback diode 31 is arranged on the top surface of the PCB component 3 and is connected between the movable contact component and the fixed contact component in parallel, and the flyback diode 36 provides a backflow path for the back electromotive force generated when the integrated electronic switch controls the starting and stopping of the motor.

In the above embodiment, by providing the flyback diode 31 in parallel relation with the moving contact assembly and the fixed contact assembly on the PCB 3, when the motor is started and stopped to generate back electromotive force, a return path is provided for the back electromotive force through the flyback diode 31, the back electromotive force is released in a current mode through the flyback diode to play a role in stabilizing voltage, therefore, the contact device and the electric elements on the PCB component are protected, and the magnetic component is arranged at the breaking port of the moving contact and the static contact, so that the electric arc generated by breaking the moving contact and the static contact is elongated and cooled under the action of the magnetic field of the magnetic component, the magnetic arc quenching effect is achieved, and the damage of the electric arc to the contact is reduced.

As shown in fig. 1, an installation slot 10 located below the fracture is arranged in the switch housing 1, and the magnetic component 66 is a magnet structure inserted in the installation slot 10, so that the installation position of the magnetic component 66 is kept stable through the installation slot 10, the position shaking of the switch housing is avoided, and the installation is convenient and fast.

The specific arrangement of the flyback diode is described in detail below with reference to fig. 1 and 5:

the static contact assembly comprises a conductive plate 64 connected with the static contact 63, the conductive plate 64 and the movable contact frame 61 are respectively connected with the PCB board component 3, as a specific structure, a first pin 611 is formed on the movable contact frame 61, a second pin 641 is formed on the conductive plate 64, two jacks 32 matched and connected with the first pin 611 and the second pin 641 are arranged on the PCB board component 3, two ends of the flyback diode 31 are respectively connected with the first pin of the movable contact frame 61 and the second pin of the conductive plate 64, the structure is that the pins and the jacks are matched to play a role in positioning and installation, and finally, the positions of the jacks are welded, so that the installation is convenient and rapid, the installation efficiency is improved, two ends of the flyback diode 31 are respectively connected with the first pin of the movable contact frame 61 and the second pin of the conductive plate 64, the flyback diode 31 is connected with the moving contact and the static contact in parallel, electric sparks caused by back electromotive force at the moving contact and the static contact are avoided, and safe use of the contact device is guaranteed.

Further preferably, as shown in fig. 1, the PCB component 3 is further provided with a copper plate 33 extending to the insertion hole, the copper plate 33 is connected to the first pin or the second pin inserted into the insertion hole 32, the movable contact frame 61 is disposed on the power switch 4 on the PCB component 3 through the copper plate, the power switch 4 is used for switching a power supply of a control motor, and the copper plate 33 has a larger cross section, a stronger current conducting capability, a stronger structural strength, and better conductivity and heat dissipation.

The specific structure of the driving structure is described in detail below with reference to fig. 1-4:

the driving structure 7 includes a contact spring 72 for applying a biasing force to the movable contact 62 to rotate toward the fixed contact 63, a driving frame 71 disposed in the switch housing 1 in a reciprocating manner, and two protruding structures 65 disposed in the driving frame 71 side by side in a high-low manner, two of the movable contact and the fixed contact are respectively disposed correspondingly, one end of each of the two movable contacts 62 respectively rotates against the two protruding structures 65 under the biasing force of the contact spring 72, and the two movable contacts 62 and the two fixed contacts 63 are respectively in contact with or separated from each other when the driving frame 71 drives the two protruding structures to reciprocate, so that the two movable contacts are driven to rotate toward the two fixed contacts by the biasing force of the contact spring 64, and one end of each of the two movable contacts 62 respectively abuts against the two protruding structures 65, according to the adjacent unequal height arrangement of the two convex structures 65 on the driving frame 71, when the driving frame is pressed to move downwards, the abdicating sequence of the two convex structures corresponding to the two moving contacts is different, so that the sequence of the two movable contacts 62 and the two convex structures 65 are in tandem, namely, under the driving of the contact spring, the moving contact and the static contact are firstly switched on, then the other moving contact and the static contact are switched on, the two groups of moving contacts and static contacts which are switched on successively are in parallel connection on a circuit, because the switch is just switched on to generate a larger surge current to pass through the contact, the contact which is switched on first can bear larger current, and the contact which is switched on later shunts partial current, the temperature rise of the contact is effectively reduced, the surge current can be well shared by the design, so that the damage to a contact mechanism caused by frequent on-off of a switch is avoided, and the service life of the switch is prolonged.

Referring to fig. 1-2, a button component 73 is disposed at the top end of the driving frame 71, and a return spring 74 is sleeved at the bottom end of the driving frame 71, the return spring 74 applies an elastic force to the driving frame 71 moving towards the button component 73, so as to return the driving frame 71 to an initial position, as can be seen from fig. 2, the two protrusion structures 65 are a first protrusion 651 and a second protrusion 652 protruding towards one side of the two movable contacts, the bottoms of the first protrusion 651 and the second protrusion 652 are flush, a recess structure 653 is disposed at the top of the first protrusion 651, so as to reduce the height of the first protrusion, and the first protrusion is disposed lower than the second protrusion, and the recess structure 653 has an obliquely disposed contact surface, so that one end of the movable contact 62 is designed to be in sliding contact with the recess structure more smoothly, through the above structure, when the driving frame 71 drives the sliding seat 72 to move downward, the moving contact contacting the notch channel structure 653 is first connected with the corresponding static contact, and then the other moving contact is connected with the corresponding static contact; and after the actuating element is released, when the driving frame 71 drives the sliding seat 72 to reset and move up under the action of the reset spring, the disconnection sequence of the two moving contacts and the two static contacts is reversed, namely the moving contact which is in contact with the notch groove structure is disconnected later, the other moving contact is disconnected first, but the time difference of the front and back connection or disconnection of the two moving contacts is very small, so that the connection and disconnection sequence between the moving contact and the static contacts is reasonably and orderly carried out, and the matching is reliable.

In this embodiment, as shown in fig. 2, one end of the movable contact 62 is bent in an L shape and is matched to abut against the protruding structure 65, and the other end of the movable contact is provided with a movable contact opposite to the fixed contact 63, the fixed contact 63 is correspondingly provided with a fixed contact, and surge current is shunted according to the contact between the two movable contacts 62 and the two fixed contacts 63, so that when designing, the movable and fixed contacts passing through a large current are generally required to be high temperature resistant, corrosion resistant and low resistance contacts, and contacts made of pure silver and silver graphite materials can be adopted, and the movable and fixed contacts that are switched on later are only required to be common composite silver contacts, so that the service life of the switch is ensured, and the cost is reduced.

The integrated electronic switch that this embodiment provided is still including install in switch housing 1's closing cap 2, casing 1 include with closing cap 2 lock forms and is fit for holding contact means, drive structure's closed cavity 11, and adjacent setting the open cavity 12 of closed cavity one side, with PCB board spare 3 including hold in the first part of closed cavity, and hold in the second part of open cavity, be equipped with switch 4 that is used for switching control motor power on the second part, it is shown with reference to figure 1, switch 4 is in six have been arranged to the second part top is two rows, and one of them row of switch is high pressure side switch, and another row of switch is low pressure side switch. The six power switches have six trigger states, and two power switches are respectively switched on to switch on corresponding motor windings.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (8)

1. A contact arrangement for an integrated electronic switch, mounted in a switch housing (1) and connected to a PCB board component (3), comprising:

the moving contact component comprises a moving contact frame (61) fixedly connected to the PCB component (3) and a moving contact (62) rotatably arranged on the moving contact frame (61);

the fixed contact component is fixedly connected to the PCB component (3) and comprises a fixed contact (63) opposite to the movable contact;

the driving structure (7) is connected with the moving contact (62) and is used for driving the moving contact (62) to be in contact with or separated from the fixed contact (63);

the magnetic component (66) is arranged in the switch shell (1) close to a breaking opening between the moving contact (62) and the static contact (63);

and the flyback diode (31) is arranged on the top surface of the PCB component (3) and is connected between the movable contact component and the fixed contact component in parallel.

2. A contact arrangement of an integrated electronic switch according to claim 1, characterized in that: an installation slot (10) located below the fracture is formed in the switch shell (1), and the magnetic part (66) is of a magnet structure inserted into the installation slot (10).

3. A contact arrangement of an integrated electronic switch according to claim 1, characterized in that: the static contact assembly comprises a conductive plate (64) connected with the static contact (63), and the conductive plate (64) and the movable contact frame (61) are respectively connected to the PCB component (3).

4. A contact arrangement of an integrated electronic switch according to claim 3, characterized in that: a first pin (611) is formed on the movable contact frame (61), a second pin (641) is formed on the conductive plate (64), two insertion holes (32) which are matched and connected with the first pin (611) and the second pin (641) are formed in the PCB component (3), and two ends of the flyback diode (31) are respectively connected with the first pin of the movable contact frame (61) and the second pin of the conductive plate (64).

5. A contact arrangement of an integrated electronic switch according to claim 4, characterized in that: the PCB component (3) is further provided with a copper plate (33) extending to be connected to the jack, and the copper plate (33) is connected with the first pin or the second pin inserted into the jack (32).

6. A contact arrangement of an integrated electronic switch according to any of claims 1-5, characterized in that: the driving structure (7) comprises a contact spring (72) which applies bias pressure to the moving contact to rotate on one side of the static contact, a driving frame (71) which can move in a reciprocating mode and is arranged on the switch shell (1), and two protruding structures (65) which are arranged on the driving frame side by side in a high-low mode, the moving contact and the static contact are correspondingly arranged in two, one end of each moving contact (62) rotates under the bias force of the contact spring (72) and abuts against the two protruding structures (65) respectively, and when the driving frame (71) drives the two protruding structures to move in the reciprocating mode, the two moving contacts (62) and the two static contacts (63) are sequentially contacted or separated respectively.

7. A contact arrangement of an integrated electronic switch according to claim 6, characterized in that: the two protruding structures (65) are respectively a first protruding block (651) and a second protruding block (652) protruding towards one side of the two moving contacts, the bottoms of the first protruding block (651) and the second protruding block (652) are flush, and a receding groove structure (653) is formed in the top of the first protruding block (651).

8. A contact arrangement of an integrated electronic switch according to claim 7, characterized in that: two contact springs (72) are arranged at the other ends of the two movable contacts (62), one end of each contact spring (72) is abutted against the side surface of each movable contact (62) back to the corresponding fixed contact, and the other end of each contact spring is abutted against an inner wall plate formed by the shell (1).

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