CN211628939U

CN211628939U - Explosion-proof switch

Info

Publication number: CN211628939U
Application number: CN201922445495.XU
Authority: CN
Inventors: 曾小云
Original assignee: Dongguan Pan American Electronics Co Ltd
Current assignee: Dongguan Pan American Electronics Co Ltd
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2020-10-02
Anticipated expiration: 2029-12-28

Abstract

The utility model discloses an explosion-proof switch, which comprises a shell, an elastic contact element, a push rod and two electrode pieces, wherein the push rod is pushed to enable the elastic contact element to be in contact with the two electrode pieces to form conductive communication; the shell is provided with an unthreaded hole embedded sleeve, and one end of the push rod is inserted into the unthreaded hole embedded sleeve from the inside of the shell and extends out of the shell; the push rod is positioned at the other end in the shell to form a limiting part; the push rod and unthreaded hole inlay and form slidable shaft hole cooperation between the dress sleeve to the fitting gap that push rod and unthreaded hole inlayed between the dress sleeve is inversely proportional with the volume of holding the chamber in the casing, and preferred ratio is: 0.08-0.19. The utility model discloses in order to avoid becoming the defect that causes the explosion because of fit clearance, when fit clearance is great, the appearance chamber of casing just reduces, just so can effectively avoid the emergence of explosion. After the technical scheme is adopted in the utility model, this switch element self has just had explosion-proof effect, can directly be used for in various explosion-proof environment.

Description

Explosion-proof switch

The technical field is as follows:

the utility model relates to a switch product technical field refers in particular to an explosion-proof switch.

Background art:

explosion-proof design is necessary for some electric products in specific fields, for example, explosion-proof products capable of preventing explosion accidents are necessary for some fields containing explosive hazardous gas mixtures. Such as explosion-proof switch products. The switch element in such switch products cannot be directly arranged in the corresponding circuit, but must be arranged in a closed housing, and the user can trigger the switch element in the housing through an external button or rotation to realize the corresponding operation.

In some environments with strict explosion-proof requirements, the switch element in the explosion-proof switch product must have an explosion-proof effect, so that the switch element itself has an explosion-proof effect even if the switch element is not isolated from the external environment by the housing. Therefore, the present inventors have made improvements to the above situation and have proposed the following solutions.

The utility model has the following contents:

the utility model aims to solve the technical problem that overcome prior art not enough, provide an explosion-proof switch that self has explosion-proof function.

In order to solve the technical problem, the utility model discloses a following technical scheme: an explosion-proof switch comprising: the shell, an elastic contact element arranged in the shell, a push rod penetrating through the shell and abutting against the elastic contact element, and two electrode elements fixed on the shell, wherein the push rod is pushed outwards from the shell to make the elastic contact element contact with the two electrode elements so that the two electrode elements form conductive communication; the shell is provided with an unthreaded hole embedded sleeve, and one end of the push rod is inserted into the unthreaded hole embedded sleeve from the inside of the shell and extends out of the shell; the push rod is positioned at the other end in the shell to form a limiting part; the push rod and the unthreaded hole embedded sleeve form a slidable shaft hole for matching, and the assembly gap between the push rod and the unthreaded hole embedded sleeve is in inverse proportion to the volume of the accommodating cavity in the shell.

Further, in the above technical solution, the volume ratio of the assembly gap between the push rod and the unthreaded hole embedded sleeve to the inner cavity of the housing is: 0.08-0.19, and the volume of the housing cavity does not exceed 100 cubic centimeters.

Further, in the above technical solution, the length of the unthreaded hole-embedded sleeve is not less than 6.9 mm.

Further, in the above technical solution, the elastic contact includes: the base body, the elastic contact piece and the reset spring are provided with a mounting groove for mounting the elastic contact piece on one side of the base body facing the electrode piece, and the reset spring pushes the base body to be pressed on the push rod so that the push rod has an outward operation trend.

Furthermore, in the above technical solution, the seat body and the cavity in the housing form a slidable nesting fit.

Further, in the above technical solution, the housing is provided with embedded nuts corresponding to the two electrode members respectively; the electrode piece is connected in the embedded nut from outside to inside in a threaded manner and extends into the shell to form electrical contact with the elastic contact piece.

Further, in the above technical solution, the housing includes: the elastic contact piece is placed into the main body from the opening position of the main body.

Further, in the above technical solution, the main body and the cover body are welded together by ultrasonic welding.

The utility model adopts the above technical scheme after, use the utility model discloses the time, through pressing down the push rod outside the casing and promoting elastic contact spare and remove, make elastic contact piece and two electrode spare contacts among the elastic contact spare, make two electrode spare form electrically conductive intercommunication. The push rod inlays the cooperation of dress axle hole for slidable between the sleeve with the unthreaded hole, because in order to guarantee the smooth removal of push rod, this kind of cooperation must be clearance fit, in order to avoid becoming the defect that causes the explosion because of this fit clearance, through continuous test, when the fit clearance is great, the appearance chamber of casing just must reduce, promptly, the volume in fit clearance and the interior chamber of casing becomes the inverse ratio, just so can effectively avoid the emergence of explosion, ensure safety.

Description of the drawings:

fig. 1 is a schematic structural diagram of the present invention.

The specific implementation mode is as follows:

the present invention will be further described with reference to the following specific embodiments and accompanying drawings.

See fig. 1, the utility model relates to an explosion-proof switch, it includes: the shell 1, the elastic contact element 2 arranged in the shell 1, the push rod 3 penetrating through the shell 1 and abutting against the elastic contact element 2, and the two electrode elements 6 fixed on the shell 1, wherein the push rod 3 is pushed outwards from the shell 1 to enable the elastic contact element 2 to be in contact with the two electrode elements 6, so that the two electrode elements 6 are in conductive communication.

The casing 1 adopt the plastic material preparation, this casing 1 includes: a main body 11 having an opening, and a lid 12 covering the opening of the main body 11. During assembly, the elastic contact piece 2 is placed into the main body 11 from the opening position of the main body, and then the main body 11 and the cover body 12 are welded and fixed into a whole through ultrasonic waves in an ultrasonic welding mode.

The elastic contact 2 includes: the base 21, the elastic contact piece 22 and the return spring 23 are provided with a mounting groove for mounting the elastic contact piece 22 on one side of the base 21 facing the electrode element 6. The elastic contact piece 22 can be configured to be elastic by itself, or can be elastic by an external spring, as shown in fig. 1, in this embodiment, the elastic contact piece 22 is elastically supported by a spring 24.

The return spring 23 pushes the seat body 21 to press against the push rod 3, so that the push rod 3 has an outward operation trend. In this embodiment, a positioning hole 25 is formed on a side of the seat 21 facing the electrode element 6, the return spring 23 is limited in the positioning hole 25, and the seat 21 tends to move toward the push rod 3 through the return spring 23.

In order to prevent the seat body 21 from shaking in the cavity of the housing 1, the seat body 21 and the cavity in the housing 1 form slidable nesting fit, and the seat body 21 is guided and positioned by the cavity.

The shell 1 is provided with an unthreaded hole embedded sleeve 4. The optical bore insert sleeve 4 is integrally fixed to the housing 1 when the housing 1 is injection molded, thereby ensuring that there is no assembly gap between the two. Meanwhile, the unthreaded hole can ensure that the unthreaded hole can be smoothly slid between the rest push rods 3 of the embedded sleeve 4.

During assembly, one end of the push rod 3 is inserted into the unthreaded hole embedded sleeve 4 from the inside of the shell 1 and extends out of the shell 1; the push rod 3 is provided with a limiting part 31 at the other end in the housing 1, and the push rod 3 is prevented from completely separating from the housing by the limiting part 31. The stopper 31 may be formed directly on the push rod 3 as a flange.

Similarly, the housing 1 is provided with embedded nuts 5 corresponding to the two electrode members 6; the electrode member 6 is screwed into the insert nut 5 from the outside to the inside, and extends into the housing 1 to electrically contact with the elastic contact piece 22.

The utility model discloses in, push rod 3 and unthreaded hole inlay and form slidable shaft hole cooperation between dress sleeve 4 to push rod 3 and unthreaded hole inlay the fitting gap between dress sleeve 4 and the volume in 1 interior appearance chamber of casing inverse ratio. Through tests, the preferable mode is as follows: the volume ratio of the assembly gap between the push rod 3 and the unthreaded hole embedded sleeve 4 to the containing cavity in the shell 1 is as follows: 0.08-0.19, the volume of the cavity of the shell 1 is not more than 100 cubic centimeters.

In addition, in order to further achieve the explosion-proof effect, the length of the unthreaded hole embedded sleeve 4 is not less than 6.9mm, and the matching surface is long enough to form obstruction and avoid explosion.

After the technical scheme is adopted in the utility model, this switch element self has just had explosion-proof effect, can directly be used for in various explosion-proof environment.

Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.

Claims

1. An explosion-proof switch comprising: the conductive contact type electrode comprises a shell (1), an elastic contact piece (2) arranged in the shell (1), a push rod (3) penetrating through the shell (1) and abutting against the elastic contact piece (2), and two electrode pieces (6) fixed on the shell (1), wherein the push rod (3) is pushed outwards from the shell (1) to enable the elastic contact piece (2) to be in contact with the two electrode pieces (6), so that the two electrode pieces (6) are in conductive communication; the method is characterized in that:

the shell (1) is provided with an unthreaded hole embedded sleeve (4), one end of the push rod (3) is inserted into the unthreaded hole embedded sleeve (4) from the inside of the shell (1) and extends out of the shell (1); the push rod (3) is positioned at the other end in the shell (1) and is provided with a limiting part (31);

the push rod (3) and the unthreaded hole embedded sleeve (4) form a slidable shaft hole for matching, and an assembly gap between the push rod (3) and the unthreaded hole embedded sleeve (4) is in inverse proportion to the volume of the cavity in the shell (1).

2. An explosion-proof switch according to claim 1, wherein: the volume ratio of an assembly gap between the push rod (3) and the unthreaded hole embedded sleeve (4) to the containing cavity in the shell (1) is as follows: 0.08-0.19, and the volume of the cavity of the shell (1) does not exceed 100 cubic centimeters.

3. An explosion-proof switch according to claim 1, wherein: the length of the unthreaded hole embedded sleeve (4) is not less than 6.9 mm.

4. An explosion-proof switch according to claim 1, wherein: the elastic contact (2) comprises: the electrode piece structure comprises a base body (21), an elastic contact piece (22) and a return spring (23), wherein one side of the base body (21) facing the electrode piece (6) is provided with a mounting groove for mounting the elastic contact piece (22), and the return spring (23) pushes the base body (21) to be pressed against a push rod (3) so that the push rod (3) has an outward operation trend.

5. An explosion-proof switch according to claim 4, wherein: the base body (21) and the cavity in the shell (1) form slidable nesting fit.

6. An explosion-proof switch according to claim 4, wherein: the positions of the shell (1) corresponding to the two electrode pieces (6) are respectively provided with an embedded nut (5); the electrode piece (6) is connected in the embedded nut (5) from outside to inside in a threaded manner and extends into the shell (1) so as to form electrical contact with the elastic contact piece (22).

7. An explosion-proof switch according to any one of claims 1 to 6, wherein: the housing (1) comprises: the contact device comprises a main body (11) with an opening and a cover body (12) covering the opening position of the main body (11), wherein the elastic contact piece (2) is placed into the main body (11) from the opening position.

8. An explosion-proof switch according to claim 7, wherein: the main body (11) and the cover body (12) are welded together by ultrasonic wave.