CN110176372B

CN110176372B - Sealed DC microswitch

Info

Publication number: CN110176372B
Application number: CN201910467343.1A
Authority: CN
Inventors: 孙学锋; 沈璟伟; 陈湧
Original assignee: Wuxi Innovation Switch Electric Appliance Co ltd
Current assignee: Wuxi Innovation Switch Electric Appliance Co ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2021-10-22
Anticipated expiration: 2039-05-31
Also published as: CN110176372A

Abstract

The invention provides a sealed direct current microswitch, which relates to the field of switches and comprises a hollow switch shell and a switch body arranged in the switch shell; the switch body comprises a press rod for controlling the switch body; the switch shell is provided with a pressing rod hole; the pressing rod extends out of the pressing rod hole; a sealing ring is sleeved and fixed on the pressing rod hole; the sealing ring seals a gap between the pressing rod and the pressing rod hole. The sealed direct-current microswitch provided by the invention has better sealing performance and a silencing effect, can effectively prevent particles, water mist and the like from entering the microswitch to damage the microswitch, and prolongs the service life of the microswitch.

Description

Sealed DC microswitch

Technical Field

The invention relates to a switch, in particular to a sealed direct current microswitch.

Background

The microswitch is a common structure, and is mainly composed of a shell, a face cover, a button, a wire inlet terminal and a wire outlet terminal, when the microswitch is used, when the button is pressed, a circuit is switched on, otherwise, the circuit is switched off, and the use requirement of a common situation can be met.

Disclosure of Invention

Therefore, in order to solve the above technical problems, the present invention provides a sealed dc microswitch, which has a good sealing performance and can effectively prevent particles, water mist, etc. from entering the microswitch to damage the microswitch.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a sealed direct current microswitch which comprises a hollow switch shell and a switch body arranged in the switch shell; the switch body comprises a press rod for controlling the switch body; the switch shell is provided with a pressing rod hole; the pressing rod extends out of the pressing rod hole; a sealing ring is sleeved and fixed on the pressing rod hole; the sealing ring seals a gap between the pressing rod and the pressing rod hole.

Preferably, the push rod hole extends to the outside of the switch shell to form an annular push rod hole wall; the pressing rod is provided with an annular groove; the sealing ring is elastic; one end of the sealing ring is sleeved in the annular groove, and the other end of the sealing ring is tightly attached to and sleeved on the hole wall of the press rod.

In the sealed direct current microswitch provided by the invention, preferably, one end of the sealing ring fixed in the annular groove is the upper end, and the other end sleeved on the hole wall of the press rod is the lower end; the lower extreme of sealing washer is cylindricly, follows cylindricly upwards extend there is the round platform tube-shape, the diameter of round platform tube-shape diminishes from bottom to top gradually.

Preferably, the direction of the pressing rod exposed outside is upward, and the direction of the pressing rod positioned in the switch shell is downward; the switch body comprises a fixed contact piece group and a movable contact piece; the static contact set comprises an upper static contact and a lower static contact arranged below the upper static contact; contacts are arranged on the upper static contact piece and the lower static contact piece respectively, and the contacts on the upper static contact piece and the lower static contact piece are arranged oppositely; contacts are arranged on two surfaces of one end of the movable contact piece, and the end of the movable contact piece, provided with the contacts, is a left end; the left end of the movable contact piece is positioned between the upper static contact piece and the lower static contact piece; the right end of the movable contact piece is fixed on the inner wall of the switch shell; the movable contact piece has elasticity; a transmission mechanism with a rebound function is arranged in the switch shell; the transmission mechanism is positioned between the pressing rod and the movable contact piece; when the movable contact piece is not acted by external force, the contact on the upper surface of the movable contact piece is propped against the contact of the upper static contact piece; when the pressing rod is subjected to external force, the transmission mechanism can press the movable contact piece to move downwards, so that the contact on the lower surface of the movable contact piece is abutted against the contact on the lower static contact piece.

The invention provides a sealed direct current microswitch, preferably, the transmission mechanism comprises a transmission piece, the right end of which can be selectively fixed in the switch shell; the transmission piece is fixedly connected with the movable contact piece; when the pressing rod is not acted by external force, the movable contact can make the driving piece prop against the bottom end of the pressing rod.

According to the sealed direct-current microswitch provided by the invention, preferably, a U-shaped elastic piece is fixed on the upper surface of the movable contact piece; the transmission sheet encircles the U-shaped elastic piece; the transmission piece is fixed on the movable contact piece by encircling the U-shaped elastic piece.

The invention provides a sealed direct current microswitch, preferably, the switch shell comprises a hollow cavity with an opening and a sealed base; the sealing base is arranged at the opening of the hollow cavity; the sealing base is in interference sealing with the hollow cavity; the sealing base and the hollow cavity form a closed space for placing the switch body; a plurality of rivets are fixed on the sealing base in a nested manner; one part of the rivet is electrically connected with one static contact piece/one movable contact piece respectively

Preferably, the side wall part of the opening of the hollow cavity is exposed out of the closed space, and forms an open space with the sealing base; the open space is filled with an epoxy sealing adhesive layer.

The sealed direct-current microswitch provided by the invention preferably further comprises a plurality of electric leads electrically connected with the switch body; a plurality of jack groups are arranged on one opposite side wall of the open space; the jack group comprises jacks arranged on different side walls; one of the jack groups is fixed with a cross bar; the epoxy sealing adhesive layer wraps the cross rod; one of the electric leads is soldered to one of the rivets; the electric lead extends from the sealing base to the external space of the open space; the epoxy sealant layer wraps a part of the electric leads positioned in the open space.

The invention provides a sealed direct current microswitch, which preferably further comprises a lever; the pressing rod is exposed from the outside in the upward direction and is positioned in the switch shell in the downward direction; the top end of the switch shell extends upwards to form a bent grid blocking piece; the bending grid separation blade is bent towards the pressing rod direction; one end of the lever is rotatably fixed at the top end of the switch shell, and the other end of the lever is limited by the bent grid baffle; the lower surface of the lever is tightly attached to the top end of the pressing rod; under the action of no external force, the pressing rod is propped against the lower surface of the top of the bent grid separation blade.

The invention has the advantages or beneficial effects that:

the invention provides a sealed direct current microswitch which comprises a hollow switch shell and a switch body arranged in the switch shell; the switch body comprises a press rod for controlling the switch body; the switch shell is provided with a pressing rod hole; the pressing rod extends out of the pressing rod hole; a sealing ring is sleeved and fixed on the pressing rod hole; the sealing ring seals a gap between the pressing rod and the pressing rod hole. The sealed direct-current microswitch provided by the invention has better sealing performance and a silencing effect, can effectively prevent particles, water mist and the like from entering the microswitch to damage the microswitch, ensures the safety of the microswitch and prolongs the service life of the microswitch.

Drawings

The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

Fig. 1 is a schematic structural view of a sealed dc microswitch provided in embodiment 1 of the present invention.

Detailed Description

In the following, the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, belong to the protection scope of the invention.

Example 1:

the sealed direct-current microswitch provided by the embodiment 1 of the invention comprises a hollow switch shell 1 and a switch body 2 arranged in the switch shell 1; the switch body 2 includes a pressing lever 21 for controlling the switch body 2; the switch shell 1 is provided with a press rod hole 11; the pressing rod 21 extends out of the pressing rod hole 11; a sealing ring 3 is sleeved and fixed on the pressing rod hole 11; the seal ring 3 seals a gap between the pressing rod 21 and the pressing rod hole 11. Through pressing pole hole 11 and pressing the gap between the pole 21 on switch housing 1 and installing sealing washer 3 additional, can prevent effectively that solid dust particles, water smoke etc. from getting into switch housing 1 inside, avoid the switch to damage, influence equipment normal work to promote switch's practical life.

Preferably, the pressing rod hole 11 extends towards the outside of the switch shell 1 to form an annular pressing rod hole wall 12; the pressing rod 21 is provided with an annular groove 211; the sealing ring 3 is a sealing ring with elasticity; one end of the sealing ring 3 is sleeved in the annular groove 211, and the other end is tightly sleeved on the press rod hole wall 12. One end of the sealing ring 3 is sleeved in the annular groove 211, namely, the end is embedded in the annular groove 211, so that the end and the pressing rod 21 are sealed; the other end is sleeved on the hole wall 12 of the pressing rod, and the hole wall 12 of the pressing rod is sealed with the sealing ring 3 in an interference manner; the packing 3 is provided to have elasticity so that the packing 3 can move along with the pressing rod 21 and always maintain sealing when the pressing rod 21 is pressed. In order to enable the sealing ring 3 to be better matched with the shapes of the annular groove 211 on the pressing rod 21 and the pressing rod hole wall 12 and to keep sealing and simultaneously facilitate the movement of the pressing rod 21, one end of the sealing ring 3 fixed in the annular groove 211 is the upper end, one end sleeved on the pressing rod hole wall 12 is the lower end, the lower end of the sealing ring 3 is cylindrical, a circular truncated cone shape extends upwards along the cylindrical shape, and the diameter of the circular truncated cone shape is gradually reduced from bottom to top; the portion of the seal ring 3 corresponding to the circular truncated cone shape can be extended and contracted, and the portion of the seal ring 3 corresponding to the circular truncated cone shape can be extended and contracted by the operation of the pressing rod 21.

In the prior art, a normally open contact and a normally closed contact are arranged in the direct current micro-switch, the contact on the movable contact piece needs to be communicated with the normally closed contact for a long time, and meanwhile, the movable contact piece is separated from the normally closed contact under the action of the transmission mechanism and is communicated with the normally open contact. Therefore, in the present embodiment, the structure of the switch body 2 is improved, and preferably, the direction in which the pressing rod 21 is exposed to the outside is upward, and the direction in which the pressing rod is located in the switch housing 1 is downward; the switch body 2 comprises a fixed contact piece group 22 and a movable contact piece 23 which are fixed in the switch shell 1; the static contact set 22 comprises an upper static contact 221 and a lower static contact 222 arranged below the upper static contact 221; the upper static contact piece 221 and the lower static contact piece 222 are both provided with a contact 0, and the contacts 0 on the upper static contact piece 221 and the lower static contact piece 222 are arranged oppositely; two surfaces of one end of the movable contact piece 23 are provided with contacts 0, and the end of the movable contact piece 23 provided with the contact 0 is the left end; the left end of the movable contact piece 23 is positioned between the upper stationary contact piece 221 and the lower stationary contact piece 222; the right end of the movable contact piece 23 is fixed on the inner wall of the switch shell 1; the movable contact piece 23 has elasticity; a transmission mechanism 4 with a rebound function is arranged in the switch shell 1; the transmission mechanism 4 is positioned between the pressing rod 21 and the movable contact piece 23; when not being acted by external force, the contact 0 on the upper surface of the movable contact piece 23 is pressed against the contact of the upper static contact piece 221; when the pressing rod 21 receives an external force, the transmission mechanism 4 can press the movable contact piece 23 to move downwards, so that the contact point on the lower surface of the movable contact piece 23 is pressed against the contact point 0 of the lower static contact piece 221. The contact 0 on the upper static contact piece 221 is a normally closed contact, the contact 0 on the lower static contact piece 222 is a normally open contact, and the contact 0 of the movable contact piece 23 keeps contact with the normally closed contact under the condition that the switch body is not stressed; when the switch is required to be switched to the normally open contact, the transmission mechanism 4 is pressed through the pressing rod 21, and the transmission mechanism 4 presses the movable contact piece 23, so that the movable contact piece 23 is separated from the normally closed contact and is connected with the normally open contact; when the pressing rod 21 is released, the movable contact piece 23 has elasticity, and under the action of the elasticity, the transmission mechanism 4 is pushed to drive the pressing rod 21 to return to an unstressed initial state, and the movable contact piece 23 is connected with the normally closed contact; the embodiment 1 of the invention solves the problems brought by the need of using a kick mechanism in the prior art, smoothly applies pressure to the movable contact piece 23, and the movable contact piece 23 rebounds and resets, and the whole switching process does not involve the kick process, thereby avoiding the occurrence of noise and playing a silent effect; meanwhile, the sealing ring can play a certain buffering role in the process of recovering the pressing rod 21, so that the recovery speed of the pressing rod 21 is reduced, the impact force of the pressing rod 21 on the switch shell 1 is reduced, the noise is further reduced, the noise in the switch shell 1 can be reduced, and the noise reduction effect is further enhanced.

Preferably, the transmission mechanism 4 comprises a transmission piece 41 with the right end selectively fixed in the switch shell; the driving sheet 41 is fixedly connected with the movable contact sheet 23; when not acted by external force, the movable contact spring 23 can make the driving spring 41 prop against the bottom end of the pressing rod 21; a U-shaped elastic piece 231 is fixed on the upper surface of the movable contact piece 23; the driving strap 41 encircles the U-shaped elastic piece; the transmission piece is fixed on the movable contact piece 23 by surrounding the U-shaped elastic piece; the U-shaped elastic member 231 has an opening facing left and a bottom end fixed to the movable contact 23. The movable contact piece 23 is fixedly connected with the transmission piece 41 through the U-shaped elastic piece 231, and when the pressing rod 21 is pressed, the movable contact piece 23 can be conveniently driven by the transmission piece 41 to be separated from the normally closed contact to be contacted with the normally open contact; when the pressing rod 21 is released, the movable contact piece 23 is bounced upwards under the action of elasticity to be in contact with the normally closed contact, and the pressing rod 21 is driven by the driving piece 41 to recover the initial state; in addition, when the movable contact piece 23 is connected with the normally open contact in the process of pressing down the pressing rod 21, the U-shaped elastic piece can play a certain buffering role, the acting force between the movable contact piece 23 and the lower static contact piece is further reduced, and the movable contact piece 23 is prevented from being damaged by the excessive force of the pressing rod.

Preferably, the switch housing 1 comprises a hollow cavity 13 with an opening and a sealing base 14; the sealing base 14 is arranged in the mouth of the hollow cavity 13; the sealing base 14 is in interference sealing with the hollow cavity 13; the sealed base 14 and the hollow cavity 13 form a sealed space 02 for placing the switch body 2; a plurality of rivets 01 are fixed on the sealing base 14 in an embedded manner; one rivet 01 is electrically connected to the upper/lower/

movable contact pieces

221, 222, 23, respectively. The switch shell 1 is provided with a hollow cavity 13 with an opening and a sealing base 14, so that the installation switch body 2 can be conveniently installed in the hollow cavity 13, and the opening of the hollow cavity 13 is sealed by the sealing base 14; by arranging the rivet 01, an electric lead 24 is conveniently connected outside the sealed type direct current micro switch, and one electric lead 24 is welded on one rivet 01 through soldering tin.

In order to further enhance and ensure the sealing effect and completely seal the gap between the hollow cavity 13 and the sealing base 14, the side wall portion of the opening of the hollow cavity 13 in this embodiment is exposed out of the sealed space 02 to form an open space 03 with the sealing base 14; the open space 03 is filled with the epoxy sealant layer 5, and the electric lead 24 extends from the sealing base 14 to the outer space of the open space 03; the epoxy sealant layer 5 encapsulates the portion of the electrical conductor 24 located in the open space 03. Through setting up epoxy sealant layer 5, both played the effect of strengthening sealed effect, can wrap up the welding part of fixing with the soldering tin between electrical lead 24 and the rivet 01 again, prevent that the condition of desoldering from taking place. Meanwhile, in order to prevent the epoxy sealant layer 5 from being pulled out by the electrical conductor 24, a plurality of jack groups are disposed on one opposite side wall of the open space 03 in this embodiment; the jack group comprises jacks arranged on different side walls; a cross bar 032 is fixed to one jack group; the epoxy sealing glue layer 5 wraps the cross rod 032; the rails 032 act as stops when the electrical leads 24 pull on the solid epoxy sealant layer 5.

Preferably, a lever 6 is also included; a bent grid blocking piece 15 extends upwards from the top end of the switch shell 1; the bending grid baffle piece 15 is bent towards the direction of the pressing rod 21; one end of the lever 6 is rotatably fixed at the top end of the switch shell 1, and the other end of the lever is limited by the bent grid blocking piece 15; the lower surface of the lever 6 is tightly attached to the top end of the pressing rod 21; the pressing rod 21 is pressed against the lower surface of the top of the bent grid stop piece 15 without being subjected to external force. The lever 6 is arranged to be a rotatable limiting structure, so that the stress area is increased, and the pressing rod 21 is conveniently stressed.

Preferably, the front view of fig. 1 is taken as a view angle of fig. 1 of the sealed type dc microswitch provided in embodiment 1 of the present invention, the facing surface is a front surface, the front surface and the rear surface of the switch housing 1 are both provided with a magnet for arc extinction, and the horizontal position of the magnet is located between the upper static contact and the lower static contact, and an arc originally existing between the contacts may deviate, so that an arc discharge phenomenon may not occur between the contacts, thereby ensuring the service life of the contacts in the dc circuit.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.

Claims

1. A sealed direct current microswitch is characterized by comprising a hollow switch shell and a switch body arranged in the switch shell; the switch body comprises a press rod for controlling the switch body; the switch shell is provided with a pressing rod hole; the pressing rod extends out of the pressing rod hole; a sealing ring is sleeved and fixed on the pressing rod hole; the sealing ring seals a gap between the pressing rod and the pressing rod hole; the pressing rod is exposed from the outside in the upward direction and is positioned in the switch shell in the downward direction; the switch body comprises a fixed contact piece group and a movable contact piece which are fixed in the switch shell; the static contact set comprises an upper static contact and a lower static contact arranged below the upper static contact; contacts are arranged on the upper static contact piece and the lower static contact piece respectively, and the contacts on the upper static contact piece and the lower static contact piece are arranged oppositely; contacts are arranged on two surfaces of one end of the movable contact piece, and the end of the movable contact piece, provided with the contacts, is a left end; the left end of the movable contact piece is positioned between the upper static contact piece and the lower static contact piece; the right end of the movable contact piece is fixed on the inner wall of the switch shell; the movable contact piece has elasticity; a transmission mechanism with a rebound function is arranged in the switch shell; the transmission mechanism is positioned between the pressing rod and the movable contact piece; when the movable contact piece is not acted by external force, the contact on the upper surface of the movable contact piece is propped against the contact of the upper static contact piece; when the pressing rod is subjected to external force, the transmission mechanism can press the movable contact piece to move downwards, so that the contact on the lower surface of the movable contact piece is abutted against the contact of the lower static contact piece; the transmission mechanism comprises a transmission piece, the right end of which can be selectively fixed in the switch shell; the transmission piece is fixedly connected with the movable contact piece; when the pressing rod is not acted by external force, the movable contact spring can enable the transmission piece to prop against the bottom end of the pressing rod; the upper surface of the movable contact spring is provided with a U-shaped elastic piece; the transmission sheet encircles the U-shaped elastic piece; the transmission piece is fixed on the movable contact piece by encircling the U-shaped elastic piece; the opening of the U-shaped elastic piece faces to the left, and the bottom end of the opening is fixed on the movable contact piece.

2. The sealed type direct current microswitch of claim 1 wherein said push rod hole extends outwardly of said switch housing with an annular push rod hole wall; the pressing rod is provided with an annular groove; the sealing ring is elastic; one end of the sealing ring is sleeved in the annular groove, and the other end of the sealing ring is tightly attached to and sleeved on the hole wall of the press rod.

3. The sealed type direct current microswitch as in claim 2, wherein one end of said sealing ring fixed in said annular groove is an upper end, and one end of said sealing ring sleeved in a wall of said press rod hole is a lower end; the lower end of the sealing ring is cylindrical, a circular truncated cone cylinder extends upwards along the cylindrical shape, and the diameter of the circular truncated cone cylinder gradually decreases from bottom to top; the part of the sealing ring corresponding to the circular truncated cone shape is telescopic.

4. The sealed type direct current microswitch of claim 1 wherein said switch housing includes a hollow cavity having an opening and a sealed base; the sealing base is arranged in the opening of the hollow cavity; the sealing base is in interference sealing with the hollow cavity; the sealing base and the hollow cavity form a closed space for placing the switch body; a plurality of rivets are fixed on the sealing base in a nested manner; one part of the rivet is electrically connected with one of the upper static contact piece/the lower static contact piece/the movable contact piece respectively.

5. The sealed type direct current microswitch of claim 4, wherein the mouth side wall portion of the hollow cavity is exposed outside the closed space to form an open space with the sealing base; the open space is filled with an epoxy sealing adhesive layer.

6. The sealed type direct current microswitch of claim 5 further comprising a plurality of electrical leads electrically connected to said switch body; a plurality of jack groups are arranged on one opposite side wall of the open space; the jack group comprises jacks arranged on different side walls; one of the jack groups is fixed with a cross bar; the epoxy sealing adhesive layer wraps the cross rod; one of the electric leads is soldered to one of the rivets; the electric lead extends from the sealing base to the external space of the open space; the epoxy sealant layer wraps a part of the electric leads positioned in the open space.

7. The sealed type direct current microswitch according to any one of claims 1 to 6, further comprising a lever; the pressing rod is exposed from the outside in the upward direction and is positioned in the switch shell in the downward direction; the top end of the switch shell extends upwards to form a bent grid blocking piece; the bending grid separation blade is bent towards the pressing rod direction; one end of the lever is rotatably fixed at the top end of the switch shell, and the other end of the lever is limited by the bent grid baffle; the lower surface of the lever is tightly attached to the top end of the pressing rod; under the action of no external force, the pressing rod is propped against the lower surface of the top of the bent grid separation blade.