CN210296172U

CN210296172U - DC speed regulating switch

Info

Publication number: CN210296172U
Application number: CN201921701173.0U
Authority: CN
Inventors: 秦仁龙; 倪宗球; 李尚淳
Original assignee: Zhejiang Changlong Electric Co ltd
Current assignee: Zhejiang Changlong Electric Co ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-04-10
Anticipated expiration: 2029-10-11

Abstract

The utility model provides a direct current speed governing switch, include: the button push rod component is arranged on the shell in a linear reciprocating manner; the push-button push rod assembly drives the first moving contact to be in contact communication with the first fixed contact firstly and then drives the second moving contact to be in contact communication with the second fixed contact; the first magnet is arranged on the shell and is opposite to the gaps between the first moving contact and the first fixed contact and between the second moving contact and the second fixed contact. When separating brake, the first magnet can blow out the arc to the electric arc magnetism that produces when first moving contact and first static contact separating brake, second moving contact and second static contact separating brake, compares with prior art, and arc extinguishing effect is good, has prolonged the life of product.

Description

DC speed regulating switch

Technical Field

The utility model relates to a speed governing switch technical field, concretely relates to direct current speed governing switch.

Background

The direct current speed regulating switch is widely applied to the field of hand-held electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers and the like, and mainly comprises a contact mechanism, a button push rod mechanism for controlling the on-off of the contact mechanism and a reversing mechanism for controlling the reversing of a motor.

The existing direct current speed regulation switch has the following defects: 1) the contact mechanism is easy to generate electric arc when opening the brake, and the existing structure has poor arc extinguishing effect; 2) the installation between the reversing moving contact and the reversing rod is not firm, the looseness is easy, and the assembly efficiency is low; 3) the freewheeling diode generally adopts the mode of shell fragment installation, also is the freewheeling diode both sides pass through the shell fragment joint, probably because vibration can lead to contact failure between freewheeling diode and the elasticity like this when using, and then can burn off the MOS pipe.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the not good defect of direct current speed governing switch arc extinguishing effect among the prior art to a direct current speed governing switch that the arc extinguishing effect is good is provided.

Therefore, the utility model provides a direct current speed governing switch, include:

the button push rod component is arranged on the shell in a linear reciprocating manner;

the push-button push rod assembly drives the first moving contact to be in contact communication with the first fixed contact firstly and then drives the second moving contact to be in contact communication with the second fixed contact;

the first magnet is arranged on the shell and is opposite to the gaps between the first moving contact and the first fixed contact and between the second moving contact and the second fixed contact.

Also comprises a brake block, a mounting plate, a first stop block, a second stop block and a second magnet,

the brake pad is movably arranged on the push rod of the button push rod assembly through an elastic piece, the brake pad is provided with a U-shaped main body part and side plate parts formed on two sides of the U-shaped main body part, and brake moving contacts arranged opposite to the first connecting plate and the second connecting plate are arranged on the two side plate parts;

the two mounting plates are respectively arranged on two sides of the U-shaped main body part;

the first stop block and the second stop block are respectively arranged on the upper side and the lower side of the brake pad, the first stop block is arranged in a U-shaped groove of the U-shaped main body part, one end of the elastic piece abuts against the second stop block, and the other end of the elastic piece abuts against the bottom of the U-shaped main body part so as to apply a biasing force to the brake pad to move towards the first connecting piece or the second connecting piece;

and the second magnet is arranged in the mounting groove of the first stop block and is opposite to the gap between the brake moving contact and the first connecting sheet and the gap between the brake moving contact and the second connecting sheet.

The button push rod component comprises a button and a push rod,

a button;

and the push rod is connected with the button, and two driving blocks suitable for driving the first moving contact and the second moving contact to act are arranged on the push rod.

Still include reversing mechanism, reversing mechanism has the reversing bar, and install in the last switching-over moving contact of reversing bar, the switching-over moving contact includes the switching-over main part, and locates separately switching-over main part both sides, with the installation department that the switching-over main part is buckled and is connected, the installation department is kept away from the one end of switching-over main part be equipped with can with the pawl structure of reversing bar hook-hang connection.

The shell is provided with a baffle plate which is matched and blocked with the third connecting sheet and the fourth connecting sheet respectively, the third connecting sheet and the fourth connecting sheet are provided with connecting main body parts which are abutted and jointed with the freewheel diode, and limiting parts which are connected with the connecting main body parts in a bending mode and are arranged along the circumferential outer wall of the freewheel diode at intervals.

The third connecting piece, the freewheeling diode and the fourth connecting piece are fixedly connected through reflow soldering. The utility model discloses technical scheme has following advantage:

1. the utility model provides a direct current speed regulation switch, through setting up first magnet, and make it and first moving contact and first static contact between, the clearance between second moving contact and the second static contact sets up relatively, so when separating brake, first magnet can blow out the arc to the electric arc magnetism that produces when first moving contact and first static contact separating brake, second moving contact and second static contact separating brake, arc extinguishing effect is good, in addition, the width of first moving contact is lighter than the width of second moving contact, button push rod subassembly drives first moving contact and first static contact intercommunication first, and then drive second moving contact and second static contact intercommunication, so when button push rod subassembly is pressed down, after driving first moving contact and first static contact intercommunication, because motor initial speed is slower, required electric current is also less, therefore the first moving contact of less width size can be matched, and after the push rod component continues to be pressed down and drives the second moving contact to be communicated with the second fixed contact in a contact mode, the rotating speed of the motor is high, the required current is also high, at the moment, the first moving contact and the second moving contact can work simultaneously to bear the large current, and the design is more reasonable.

2. The utility model provides a direct current speed governing switch is through setting up second magnet in the mounting groove of first dog to make its and brake moving contact and first connection piece between, the clearance between brake moving contact and the second connection piece set up relatively, thereby reach magnetic blow-out arc extinguishing effect well, the mounted position reasonable in design of second magnet.

3. The utility model provides a direct current speed governing switch, reversing mechanism have the switching-over pole to and install the switching-over moving contact on the switching-over pole, the switching-over moving contact includes the switching-over main part, and locate switching-over main part both sides, with the installation department that the switching-over main part is buckled and is connected in the branch, the one end that the switching-over main part was kept away from to the installation department is equipped with the pawl structure that can be connected with the switching-over pole hook. Because the reversing moving contact is connected with the reversing rod in a hooking mode through the inverted tooth structure, the reversing moving contact is firmer to mount, is more rapid and convenient to assemble, and improves the working efficiency.

4. The utility model provides a direct current speed governing switch still includes freewheel diode to and the third connection piece and the fourth connection piece of locating the freewheel diode both sides separately, be equipped with the baffle that stops with third connection piece and fourth connection piece cooperation respectively on the casing, third connection piece and fourth connection piece all have with the connection main part of freewheel diode laminating butt, and with connect the main part and buckle the spacing portion of being connected, setting up along freewheel diode circumference outer wall interval. Through setting up spacing portion to inject freewheeling diode's mounted position, in addition, third connection piece, freewheeling diode and fourth connection piece pass through reflow soldering fixed connection, make the freewheeling diode installation more firm, thereby be difficult for burning off the MOS pipe.

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 perspective view of the dc speed control switch of the present invention with the cover plate removed;

FIG. 2 is a perspective view of the button pusher assembly of FIG. 1 with the button pusher assembly removed;

FIG. 3 is a diagram showing the relationship between the installation positions of the push rod, the first movable contact and the second movable contact;

FIG. 4 is a perspective view of the push rod, the brake pad, the first connecting piece and the third connecting piece after being combined;

FIG. 5 is a view showing the mounting position of FIG. 4;

FIG. 6 is an exploded view of the push rod and brake pad;

fig. 7 is a perspective view of the reversing lever and the reversing movable contact;

FIG. 8 is a schematic diagram of the exploded structure of FIG. 7;

fig. 9 is a perspective view of the reversing moving contact;

fig. 10 is an exploded structural view of the third connection pad, the freewheel diode, and the fourth connection pad.

Description of reference numerals: 1. a housing; 11. a baffle plate; 12. a movable contact frame; 21. a first moving contact; 22. a second moving contact; 23. a first fixed contact; 24. a second fixed contact; 25. a first magnet; 3. a brake pad; 31. a U-shaped main body portion; 32. a side plate portion; 33. a brake moving contact; 4. a push rod; 40. mounting a plate; 41. a first stopper; 42. a second stopper; 43. a second magnet; 44. a button; 45. a drive block; 51. a first connecting piece; 52. a second connecting sheet; 6. a reversing lever; 7. a reversing moving contact; 71. a commutation main body part; 72. an installation part; 73. a pawl structure; 8. a freewheeling diode; 91. a third connecting sheet; 92. a fourth connecting sheet; 93. a connecting body portion; 94. a limiting part.

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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, 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. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Examples

The present embodiment provides a dc speed-regulating switch, as shown in fig. 1, which includes a push-button rod assembly, a first movable contact 21, a second movable contact 22, a first magnet 25, a brake mechanism, a reversing mechanism, and a freewheeling diode mounting structure.

A push button bar assembly mounted on the housing 1 to be linearly reciprocated, as shown in fig. 1 and 3, comprising: a button 44; and the push rod 4 is connected with the button 44, and two driving blocks 45 suitable for driving the first movable contact 21 and the second movable contact 22 to act are arranged on the push rod 4.

As shown in fig. 1 and 2, a first movable contact 21 and a second movable contact 22 are disposed side by side on the movable contact frame 12 of the housing 1 and are respectively opposite to a first fixed contact 23 and a second fixed contact 24, a width of the first movable contact 21 is smaller than a width of the second movable contact 22, wherein the push-button rod assembly first drives the first movable contact 21 to be in contact communication with the first fixed contact 23, and then drives the second movable contact 22 to be in contact communication with the second fixed contact 24. In this embodiment, the rotation center of the second movable contact 22 is disposed near the middle of the movable contact frame 12, and the first movable contact 21 is disposed near the right end of the movable contact frame, so that the push rod 4 will contact the first movable contact 21 first and then contact the second movable contact 22 when moving downward.

The first magnet 25 is disposed in the mounting groove of the housing 1, and is disposed opposite to the gap between the first movable contact 21 and the first fixed contact 23, and the gap between the second movable contact 22 and the second fixed contact 24.

The brake mechanism includes a brake pad 3, a mounting plate 40, a first stopper 41, a second stopper 42, and a second magnet 43.

As shown in fig. 4-6, the brake block 3 is movably mounted on the push rod 4 of the push button rod assembly through an elastic member, the brake block 3 has a U-shaped main body portion 31, and side plate portions 32 formed at both sides of the U-shaped main body portion 31, and the two side plate portions 32 are respectively provided with a brake movable contact 33 disposed opposite to the first connecting piece 51 and the second connecting piece 52. The two mounting plates 40 are respectively arranged on two sides of the U-shaped main body portion 31, the first stop block 41 and the second stop block 42 are respectively arranged on the upper side and the lower side of the brake pad 3, the first stop block 41 is arranged in a U-shaped groove of the U-shaped main body portion 31, one end of the elastic piece abuts against the second stop block 42, the other end of the elastic piece abuts against the bottom of the U-shaped main body portion 31 so as to apply a biasing force to the brake pad 3, the biasing force moves towards the direction of the first connecting piece 51 or the direction of the second connecting piece 52, and the second magnet 43 is arranged in a mounting groove of the first stop block 41 and is opposite to a gap between the brake moving contact 33 and the first connecting piece 51 and a gap between the brake moving contact 33 and the second connecting piece 52.

As shown in fig. 7-9, the reversing mechanism includes a reversing rod 6, and a movable reversing contact 7 mounted on the reversing rod 6 (it should be noted that the reversing mechanism is a mature technology, and therefore, other structures of the reversing mechanism are not specifically described), where the movable reversing contact 7 includes a reversing main body portion 71, and mounting portions 72 respectively disposed on two sides of the reversing main body portion 71 and connected to the reversing main body portion 71 in a bending manner, one end of the mounting portion 72, which is far away from the reversing main body portion 71, is provided with a pawl structure 73 capable of being hooked and connected to the reversing rod 6, and after the pawl structure 73 extends into a mounting through hole formed on the reversing rod 6 from the front surface thereof, the pawl structure cooperates with a blocking surface on the back surface of the reversing rod 6 to block, so as to define a mounting position of the movable reversing contact 7 on.

As shown in fig. 2 and 10, the freewheeling diode mounting structure includes a freewheeling diode 8, and a third connection piece 91 and a fourth connection piece 92 respectively disposed on two sides of the freewheeling diode 8, a baffle 11 is disposed on the housing 1 and respectively cooperates with the third connection piece 91 and the fourth connection piece 92 to block, the third connection piece 91 and the fourth connection piece 92 both have a connection main portion 93 abutted to the freewheeling diode 8, and a limiting portion 94 connected to the connection main portion 93 in a bending manner and disposed at intervals along the circumferential outer wall of the freewheeling diode 8, and the third connection piece 91, the freewheeling diode 8 and the fourth connection piece 92 are fixedly connected by reflow soldering.

The utility model discloses a direct current speed governing switch through setting up first magnet 25 and second magnet 43, can play the magnetic blow-out arc extinguishing effect well, has prolonged the life of product, and the mounted position of first magnet and second magnet is reasonable.

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

1. A DC speed-regulating switch, comprising:

the button push rod component is arranged on the shell (1) in a linear reciprocating manner;

the button push rod assembly comprises a first moving contact (21) and a second moving contact (22), wherein the first moving contact (21) and the second moving contact (22) are arranged on a moving contact frame (12) of the shell (1) side by side and are respectively opposite to a first fixed contact (23) and a second fixed contact (24), the width of the first moving contact (21) is smaller than that of the second moving contact (22), the button push rod assembly firstly drives the first moving contact (21) to be in contact communication with the first fixed contact (23) and then drives the second moving contact (22) to be in contact communication with the second fixed contact (24);

the first magnet (25) is arranged on the shell (1) and is opposite to gaps between the first moving contact (21) and the first fixed contact (23) and between the second moving contact (22) and the second fixed contact (24).

2. The dc speed regulation switch of claim 1, further comprising:

the brake pad (3) is movably arranged on a push rod (4) of the button push rod assembly through an elastic piece, the brake pad (3) is provided with a U-shaped main body part (31) and side plate parts (32) formed on two sides of the U-shaped main body part (31), and brake moving contacts (33) arranged opposite to the first connecting plate (51) and the second connecting plate (52) are respectively arranged on the two side plate parts (32);

the two mounting plates (40) are respectively arranged on two sides of the U-shaped main body part (31);

the brake pad comprises a first stop block (41) and a second stop block (42) which are respectively arranged at the upper side and the lower side of the brake pad (3), the first stop block (41) is arranged in a U-shaped groove of the U-shaped main body part (31), one end of an elastic piece is abutted against the second stop block (42), the other end of the elastic piece is abutted against the bottom of the U-shaped main body part (31), and therefore biasing force moving towards the direction of the first connecting piece (51) or the second connecting piece (52) is exerted on the brake pad (3);

and the second magnet (43) is arranged in the mounting groove of the first stop block (41) and is opposite to the gaps between the brake moving contact (33) and the first connecting sheet (51) and between the brake moving contact (33) and the second connecting sheet (52).

3. The dc speed control switch of claim 2, wherein the push button push rod assembly comprises:

a button (44);

the push rod (4) is connected with the button (44), and two driving blocks (45) suitable for driving the first moving contact (21) and the second moving contact (22) to act are arranged on the push rod (4).

4. The direct current speed regulation switch according to any one of claims 1 to 3, further comprising a reversing mechanism, wherein the reversing mechanism has a reversing rod (6), and a reversing movable contact (7) mounted on the reversing rod (6), the reversing movable contact (7) includes a reversing main body portion (71), and mounting portions (72) respectively disposed on both sides of the reversing main body portion (71) and connected with the reversing main body portion (71) in a bending manner, and an inverted tooth structure (73) capable of being hooked and connected with the reversing rod (6) is disposed at an end of the mounting portion (72) away from the reversing main body portion (71).

5. The direct-current speed regulation switch according to any one of claims 1 to 3, further comprising a freewheeling diode (8), and a third connecting piece (91) and a fourth connecting piece (92) respectively disposed on two sides of the freewheeling diode (8), wherein the housing (1) is provided with a baffle (11) respectively blocked by the third connecting piece (91) and the fourth connecting piece (92) in a matching manner, the third connecting piece (91) and the fourth connecting piece (92) are respectively provided with a connecting main body portion (93) jointed and abutted with the freewheeling diode (8), and a limiting portion (94) connected with the connecting main body portion (93) in a bending manner and disposed at an interval along the circumferential outer wall of the freewheeling diode (8).

6. A DC speed regulation switch according to claim 5, characterized in that the third connection pad (91), the freewheel diode (8) and the fourth connection pad (92) are fixedly connected by reflow soldering.