Explosion-proof microswitch

Abstract

The utility model discloses an explosion-proof microswitch, which comprises a microswitch, the microswitch is arranged in a shell, a push rod and a movable block are arranged in the shell, a spring is sleeved on the push rod, the lower part of the push rod is connected with the movable block, the microswitch is arranged below the movable block, a stainless steel insert is arranged on the shell, and the stainless steel insert is arranged on the shell. An explosion-proof combination surface is formed between the stainless steel insert and the outer wall of the push rod, and the lower part of the shell is filled with an encapsulation compound layer; the push rod is sleeved with a spring, when the push rod is pushed by external force, the spring is stressed to push the movable block, and the movable block pushes a contact of the microswitch, so that the switch is switched on or switched off. The explosion-proof microswitch provided by the utility model not only has the function of preventing mistaken touch, but also avoids the defect of explosion caused by mistaken touch of the explosion-proof microswitch in an explosive gas environment; and meanwhile, after the encapsulation compound is solidified, the structure has a self-locking function.

Description

Technical Field

[0001] The utility model relates to an electrical switch, in particular to an explosion-proof micro switch. Background Art

[0002] The existing explosion-proof micro switch is usually a plastic shell with a push rod inside the shell. When an external force acts on the push rod, the push rod pushes the micro switch inside the shell to connect and disconnect the micro switch, thereby sending an on-off signal.

[0003] Explosion-proof micro switches are generally used inside explosion-proof products to cut off power when the cover is opened. When the cover of the lamp is opened for maintenance, the explosion-proof micro switch is exposed to the explosive gas environment. If the push rod of the explosion-proof micro switch is accidentally touched at this time, the lamp will be powered on, which may easily cause an explosion accident.

[0004] Micro switches are usually cast inside a plastic shell, but due to the different expansion coefficients of the plastic shell and the casting compound, after long-term temperature changes, a gap will form between the casting compound and the plastic shell, causing the switch to fall off. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an explosion-proof micro switch, which not only has the function of preventing accidental touch, but also avoids the disadvantage of explosion caused by accidental touch in an explosive gas environment; at the same time, its structure has a self-locking function after the encapsulation compound is solidified.

[0006] The technical solution adopted by the utility model to solve the above-mentioned technical problems is to provide an explosion-proof micro switch, including a micro switch, wherein the micro switch is arranged in a shell, a push rod and a movable block are arranged in the shell, a spring is sleeved on the push rod, the lower part of the push rod is connected to the movable block, and the micro switch is located below the movable block, wherein a stainless steel insert is arranged on the shell, a flameproof joint surface is formed between the stainless steel insert and the outer wall of the push rod, and a casting compound layer is filled below the shell; a spring is sleeved on the push rod, and when an external force pushes the push rod, the spring is forced to push the movable block, and the movable block pushes the contacts of the micro switch to turn on or off the switch.

[0007] Furthermore, a first boss is provided below the push rod, a second boss is provided above the movable block, and the spring is fixed between the first boss and the second boss.

[0008] Furthermore, a baffle is provided on the shell, and the height of the baffle is higher than the height of the push rod.

[0009] Furthermore, the shell is a plastic shell, and the shell and the baffle are integrally formed.

[0010] Furthermore, a first groove is formed on the shell, a second groove is formed above the push rod, a waterproof cover is installed on the push rod, one end of the waterproof cover is located in the first groove, and the other end of the waterproof cover is located in the second groove.

[0011] Furthermore, a casting cavity for filling the casting compound layer is formed below the shell, and a third groove is formed on the inner wall of the casting cavity. When the casting compound layer solidifies, a third boss is formed in the third groove, so that the casting compound layer is stuck on the shell.

[0012] Furthermore, a sealing ring is provided at the contact point of the micro switch.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the explosion-proof micro switch provided by the utility model has an anti-mistouch function, avoiding the disadvantage of explosion caused by mistouch in an explosive gas environment; at the same time, its structure has a self-locking function after the casting compound solidifies. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the explosion-proof micro switch of the utility model;

[0015] Figure 2 This is a cross-sectional view of the explosion-proof micro switch of the utility model along the left and right directions;

[0016] Figure 3 This is a cross-sectional view of the explosion-proof micro switch of the utility model along the front-to-back direction.

[0017] The markings in the figure are:

[0018] 1 Micro switch 2 Housing 3 Push rod

[0019] 4 movable block 5 sealing ring 6 stainless steel insert

[0020] 7 waterproof cover 8 spring 9 casting compound layer

[0021] 10 baffle 11 first groove 12 second groove

[0022] 13 third groove 14 first boss 15 second boss

[0023] 16 third boss 17 contact DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of the explosion-proof micro switch of the utility model; Figure 2 This is a cross-sectional view of the explosion-proof micro switch of the utility model along the left and right directions; Figure 3 This is a cross-sectional view of the explosion-proof micro switch of the utility model along the front-to-back direction.

[0026] See also Figure 1 , Figure 2 and Figure 3 The explosion-proof micro switch provided by the utility model includes a micro switch 1, which is arranged in a shell 2, a push rod 3 and a movable block 4 are arranged in the shell 2, a spring 8 is sleeved on the push rod 3, the lower part of the push rod 3 is connected to the movable block 4, and the micro switch 1 is located below the movable block 4, wherein a stainless steel insert 6 is arranged on the shell 2, and a flameproof joint surface is formed between the stainless steel insert 6 and the outer wall of the push rod 3, and a casting compound layer 9 is filled below the shell 2; a spring 8 is sleeved on the push rod 3, when an external force pushes the push rod 3, the spring 8 is forced to push the movable block 4, and the movable block 4 pushes the contact 17 of the micro switch to turn on or off the switch.

[0027] The explosion-proof micro switch provided by the utility model has a housing 2 which is a plastic shell, on which a baffle 10 is arranged, the height of which is slightly higher than that of the push rod 3, which can effectively prevent the push rod 3 from malfunctioning; the plastic shell and the baffle 10 are integrally formed.

[0028] The explosion-proof micro switch provided by the utility model has a first groove 11 on the housing 1 for installing the waterproof cover 7, and a second groove 12 is provided above the push rod 3 to effectively prevent the waterproof cover 7 from falling off; the waterproof cover 7 is very thin, and the waterproof cover 7 will be squeezed and deformed when the push rod 3 moves.

[0029] The explosion-proof micro switch provided by the utility model has a stainless steel insert 6 on the housing 2, and forms an explosion-proof joint surface with the outer wall of the push rod 3, which can automatically extinguish the sparks generated by the switch when passing through, thereby achieving an explosion-proof effect. A first boss 14 is provided below the push rod 3, a second boss 15 is provided above the movable block 4, and a spring 8 is fixed between the first boss 14 and the second boss 15. The micro switch 1 is located below the movable block 4. When an external force pushes the push rod 3, the spring 8 is forced to push the movable block 4, and the movable block 4 pushes the contact 17 of the micro switch 1, thereby turning the switch on or off. When the external force disappears, the spring 8 pushes the push rod 3 in the opposite direction to reset it.

[0030] The explosion-proof micro switch provided by the utility model has a sealing ring 5 installed at the contact 17 of the micro switch, which can effectively prevent the casting compound layer 9 from overflowing and prevent the switch contact from solidifying and failing to work normally. Preferably, a casting cavity is provided below the housing 2, and a third groove 13 is provided on the inner wall. When the casting compound layer 9 solidifies, a third boss 16 is formed, so that the casting compound layer 9 is firmly stuck on the housing 2.

[0031] In summary, the explosion-proof micro switch provided by the utility model has an anti-mistouch function, which avoids the disadvantage of explosion caused by mistouch in an explosive gas environment; at the same time, its structure has a self-locking function after the encapsulation compound solidifies.

[0032] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. An explosion-proof micro switch, comprising a micro switch (1), wherein the micro switch (1) is arranged in a housing (2), wherein a push rod (3) and a movable block (4) are arranged in the housing (2), wherein a spring (8) is sleeved on the push rod (3), wherein the lower part of the push rod (3) is connected to the movable block (4), and the micro switch (1) is located below the movable block (4), wherein the micro switch (1) is characterized in that: The shell (2) is provided with a stainless steel insert (6), and a flameproof joint surface is formed between the stainless steel insert (6) and the outer wall of the push rod (3). The bottom of the shell (2) is filled with a casting compound layer (9); a spring (8) is sleeved on the push rod (3), and when an external force pushes the push rod (3), the spring (8) is forced to push the movable block (4), and the movable block (4) pushes the contact (17) of the micro switch to turn the switch on or off.

2. The explosion-proof micro switch according to claim 1, characterized in that: A first boss (14) is provided below the push rod (3), a second boss (15) is provided above the movable block (4), and the spring (8) is fixed between the first boss (14) and the second boss (15).

3. The explosion-proof micro switch according to claim 1, characterized in that: The housing (2) is provided with a baffle (10), and the height of the baffle (10) is higher than the height of the push rod (3).

4. The explosion-proof micro switch according to claim 3, characterized in that: The shell (2) is a plastic shell, and the shell (2) and the baffle (10) are integrally formed.

5. The explosion-proof micro switch according to claim 1, characterized in that: A first groove (11) is formed on the shell (2), a second groove (12) is formed above the push rod (3), a waterproof sleeve (7) is installed on the push rod (3), one end of the waterproof sleeve (7) is located in the first groove (11), and the other end of the waterproof sleeve (7) is located in the second groove (12).

6. The explosion-proof micro switch according to claim 1, characterized in that: A casting cavity for filling a casting compound layer (9) is formed below the shell (2), and a third groove (13) is formed on the inner wall of the casting cavity. When the casting compound layer (9) solidifies, a third boss (16) is formed in the third groove (13), so that the casting compound layer (9) is stuck on the shell (2).

7. The explosion-proof micro switch according to claim 1, characterized in that: A sealing ring (5) is provided at the contact point (17) of the micro switch.

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