Explosion-proof switch and explosion-proof electric appliance

Abstract

The utility model provides an explosion-proof switch and an explosion-proof electric appliance, and the explosion-proof switch comprises a first protection shell which is provided with a first accommodation cavity and a wire passing hole, and the wire passing hole is communicated with the first accommodation cavity; the switch element is arranged on the first protective shell and is accommodated in the first accommodating cavity; the first sealing element is arranged on the outer side of the switch element in a sleeving mode, and the first sealing element is in sealing contact with the switch element and the inner wall of the first containing cavity; one end of the leading-out cable is connected with the switch element, and the other end of the leading-out cable penetrates through the wire passing hole and extends out of the first protective shell; and the second sealing element is arranged in the wire passing hole, and the second sealing element is respectively in sealing contact with the inner wall of the wire passing hole and the leading-out cable. By sealing the assembly gap between the switch element and the first protective shell and sealing the assembly gap between the leading-out cable and the first protective shell, the sealing performance of the explosion-proof switch is improved, and the phenomenon of short circuit or detonation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof electrical appliances, in particular to an explosion-proof switch and an explosion-proof electrical appliance. Background Art

[0002] In the related art, when explosion-proof electrical appliances (such as lamps and instruments) are in use, a push-button switch is used for starting and closing control. When the push-button switch is used as an independent component, it generally includes a housing, a switch element, a button, and a lead wire. Both ends of the housing are communicated. The switch element and the button are arranged inside one end of the housing, and the lead wire is arranged inside the other end of the housing. However, due to the assembly gaps between the switch element and the inner wall of the housing, and between the lead wire and the inner wall of the housing, the sealing performance of the push-button switch is poor. Rainwater and other flammable and explosive fluids in the external environment can easily enter the explosion-proof electrical appliance through the push-button switch, resulting in short circuits or causing deflagration. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an explosion-proof switch and an explosion-proof electrical appliance, aiming to solve the problem of poor sealing performance of the push-button switch in the related art.

[0004] To solve the above technical problem, the first aspect of the utility model provides an explosion-proof switch, including:

[0005] A first protective shell, provided with a first accommodating cavity and a wire passing hole, and the wire passing hole communicates with the first accommodating cavity;

[0006] A switch element, arranged on the first protective shell and received in the first accommodating cavity;

[0007] A first sealing member, sleeved outside the switch element, and the first sealing member is in sealed contact with the switch element and the inner wall of the first accommodating cavity respectively;

[0008] A lead wire, one end of which is connected to the switch element, and the other end passes through the wire passing hole and extends out of the first protective shell; and,

[0009] A second sealing member, arranged in the wire passing hole, and the second sealing member is in sealed contact with the inner wall of the wire passing hole and the lead wire respectively.

[0010] Optionally, the second sealing member is filled in the wire passing hole.

[0011] Optionally, the diameter of the wire passing hole ranges from 10 mm to 15 mm, and the length of the wire passing hole ranges from 20 mm to 25 mm.

[0012] Optionally, an annular mounting groove is provided on the inner wall of the wire passing hole, and the second seal is disposed in the mounting groove.

[0013] Optionally, a first limiting boss is provided on the outer side of the switch element, the first limiting boss abuts against the end of the first protective shell, and the first seal is disposed on one side of the first limiting boss close to the lead wire.

[0014] Optionally, the first protective shell includes:

[0015] A main body portion provided with the first accommodating cavity; and,

[0016] A connecting portion provided with the wire passing hole, a first mounting structure and a third seal are provided on the outer side of the connecting portion, the first mounting structure is used to fix the connecting portion on the body of the explosion-proof device, and the third seal is used to contact the connecting portion and the body of the explosion-proof device respectively.

[0017] Optionally, the explosion-proof switch further includes a first flame retardant member sleeved on the outer side of the connecting portion, the third seal is disposed between the first flame retardant member and the connecting portion, and the first flame retardant member is used to contact the body of the explosion-proof device.

[0018] Optionally, the explosion-proof switch further includes:

[0019] A second protective shell disposed at one end of the first protective shell away from the lead wire and located outside the first protective shell, a second accommodating cavity is provided in the second protective shell, and a second mounting structure is provided on the outer side of the second protective shell, the second mounting structure is used to fix the second protective shell on the body of the explosion-proof device; and,

[0020] A button slidably assembled in the second protective shell and received in the second accommodating cavity, the button can slide to contact or separate from the switch element to turn on or off the switch element.

[0021] Optionally, the explosion-proof switch further includes a second flame retardant member sleeved on the outer side of the second protective shell, and the second flame retardant member is used to contact the body of the explosion-proof device.

[0022] In a second aspect of the present invention, an explosion-proof electrical appliance is provided, including the explosion-proof switch and the body as described in any one of the above, the explosion-proof switch is disposed on the body, and the explosion-proof switch is electrically connected to the body.

[0023] Compared with related technologies, a kind of explosion-proof switch and explosion-proof electrical appliance in the present utility model have the beneficial effects that: by arranging a first sealing member to be in sealing contact with the switch element and the inner wall of the first accommodating cavity respectively, the assembly gap between the switch element and the first protective shell is sealed; and by arranging a second sealing member to be in sealing contact with the inner wall of the wire passing hole and the lead-out cable respectively, the assembly gap between the lead-out cable and the first protective shell is sealed, thereby improving the sealing performance of the explosion-proof switch and preventing rainwater and other flammable and explosive fluids in the external environment from easily entering the explosion-proof electrical appliance through the assembly gap of the explosion-proof switch, thus avoiding the occurrence of short circuit or deflagration phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of an internal lock type explosion-proof switch provided by the present utility model;

[0026] Figure 2 is a cross-sectional view of an internal lock type explosion-proof switch provided by the present utility model;

[0027] Figure 3 is a schematic structural diagram of an external lock type explosion-proof switch provided by the present utility model;

[0028] Figure 4 is a cross-sectional view of an external lock type explosion-proof switch provided by the present utility model.

[0029] In the drawings, each reference numeral represents: 1, the first protective shell; 11, the main body part; 111, the first accommodating cavity; 112, the first connection structure; 113, the third connection structure; 12, the connection part; 121, the wire passing hole; 2, the switch element; 21, the first limiting boss; 22, the pin; 23, the second connection structure; 3, the second protective shell; 31, the second accommodating cavity; 32, the second limiting boss; 33, the relief hole; 34, the third limiting boss; 35, the fourth connection structure; 4, the button; 41, the fourth limiting boss; 5, the first sealing member; 6, the lead-out cable; 7, the second sealing member; 8, the third sealing member; 9, the first mounting structure; 10, the first flame retardant; 20, the second mounting structure; 30, the second flame retardant; 40, the washer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, but should not be construed as limiting the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 utility model.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" and "several" mean two or more, unless otherwise specifically defined.

[0033] Embodiment:

[0034] An embodiment of the present utility model provides an explosion-proof electrical appliance, including an explosion-proof switch and an appliance body. The explosion-proof switch is disposed on the appliance body and is electrically connected to the appliance body so that the explosion-proof switch can control the start and stop of the explosion-proof electrical appliance. In some specific examples, the explosion-proof electrical appliance may be an explosion-proof lamp, an explosion-proof instrument, an explosion-proof motor, etc.

[0035] Please refer to Figures 1 to 4, the explosion-proof switch includes a first protective housing 1, a switch element 2, a first seal 5, a lead cable 6, and a second seal 7. The first protective housing 1 is provided with a first receiving cavity 111 and a wire passing hole 121, and the wire passing hole 121 communicates with the first receiving cavity 111; the switch element 2 is disposed on the first protective housing 1 and is received in the first receiving cavity 111; the first seal 5 is sleeved outside the switch element 2, and the first seal 5 is in sealing contact with the switch element 2 and the inner wall of the first receiving cavity 111 respectively; one end of the lead cable 6 is connected to the switch element 2, and the other end passes through the wire passing hole 121 and extends outside the first protective housing 1; the second seal 7 is disposed in the wire passing hole 121, and the second seal 7 is in sealing contact with the inner wall of the wire passing hole 121 and the lead cable 6 respectively.

[0036] By providing that the first seal 5 is in sealing contact with the switch element 2 and the inner wall of the first receiving cavity 111 respectively, the assembly gap between the switch element 2 and the first protective housing 1 is sealed; and by providing that the second seal 7 is in sealing contact with the inner wall of the wire passing hole 121 and the lead cable 6 respectively, the assembly gap between the lead cable 6 and the first protective housing 1 is sealed, thereby improving the sealing performance of the explosion-proof switch and preventing rainwater and other flammable and explosive fluids in the external environment from easily entering the explosion-proof electrical appliance through the assembly gap of the explosion-proof switch, thus avoiding the occurrence of short circuits or deflagration.

[0037] It should be noted that, as Figure 2 and Figure 4 shown, the switch element 2 is provided with pins 22. One end of the lead cable 6 is connected to the pins 22, and the other end extends outside the first protective housing 1 through the wire passing hole 121 and is connected to the device body, thereby realizing the electrical connection between the explosion-proof switch and the device body.

[0038] In some embodiments, the second seal 7 is filled in the wire passing hole 121. Specifically, after the lead cable 6 passes through, sealant is filled into the wire passing hole 121 to form the second seal 7, which can make the seal between the lead cable 6 and the first protective housing 1 stronger. Among them, the sealant can be polyurethane sealant, chloroprene rubber sealant, epoxy resin sealant, etc.; the diameter of the wire passing hole 121 ranges from 10 mm to 15 mm, for example, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.; the length of the wire passing hole 121 ranges from 20 mm to 25 mm, for example, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, etc., to ensure that enough sealant can be accommodated in the wire passing hole 121.

[0039] In some other embodiments, an annular installation groove is provided on the inner wall of the wire passing hole 121, and the second seal 7 is disposed in the installation groove. Specifically, the second seal 7 is first installed in the installation groove, and then the lead-out cable 6 is passed through the second seal 7, making the assembly of the second seal 7 relatively simple. Among them, the second seal 7 can be a sealing ring. Multiple installation grooves and multiple sealing rings can be provided in the wire passing hole 121. The multiple installation grooves are spaced along the length direction of the wire passing hole 121, and the multiple sealing rings are respectively installed in the multiple installation grooves.

[0040] Please refer to Figure 2 and Figure 4 , a first limiting boss 21 is provided on the outer side of the switch element 2. The first limiting boss 21 abuts against the end of the first protective shell 1, thereby preventing the switch element 2 from moving further downward during the assembly process with the first protective shell 1. Moreover, the first limiting boss 21 can preliminarily seal the first accommodation cavity 111. The first seal 5 is disposed on the side of the first limiting boss 21 close to the lead-out cable 6, so that the first seal 5 can seal the assembly gap between the first limiting boss 21 and the first protective shell 1 to ensure the sealing performance. Among them, the first seal 5 can be a sealing ring.

[0041] Please refer to Figure 2 and Figure 4 , the first protective shell 1 includes a main body portion 11 and a connecting portion 12. The main body portion 11 is provided with a first accommodation cavity 111. The connecting portion 12 is provided with a wire passing hole 121. The diameter of the wire passing hole 121 is smaller than the diameter of the first accommodation cavity 111, so that a stepped structure is formed between the main body portion 11 and the connecting portion 12, which is convenient for the connecting portion 12 to be connected to the device body of the explosion-proof device. A first installation structure 9 and a third seal 8 are provided on the outer side of the connecting portion 12. The first installation structure 9 is used to fix the connecting portion 12 on the device body of the explosion-proof device, thereby installing the explosion-proof switch on the device body of the explosion-proof device. The third seal 8 is sleeved on the outer side of the connecting portion 12. The third seal 8 is used to contact the connecting portion 12 and the device body of the explosion-proof device respectively to ensure the sealing performance between the explosion-proof switch and the device body of the explosion-proof device.

[0042] Please refer to Figure 3 and Figure 4 , in some embodiments, a thread is provided on the outer side of the connecting portion 12. The first installation structure 9 can be a lock nut. The lock nut is screwed on the outer side of the connecting portion 12, and the lock nut abuts against the device body and locks and fixes the device body on the stepped structure between the main body portion 11 and the connecting portion 12.

[0043] It should be noted that when the connecting portion 12 of the first protective shell 1 is locked and fixed on the device body of the explosion-proof electrical appliance, the explosion-proof switch as a whole protrudes from the outer surface of the device body, thereby forming an externally locked explosion-proof switch.

[0044] Please refer to Figure 3 and Figure 4 , the explosion-proof switch further includes a first flame retardant member 10, the first flame retardant member 10 is sleeved on the outer side of the connecting portion 12, the third sealing member 8 is disposed between the first flame retardant member 10 and the connecting portion 12, and the first flame retardant member 10 is used to contact the body of the explosion-proof device, so as to prevent fire from spreading between the explosion-proof switch and the body of the device; wherein, the first flame retardant member 10 can be made of flame-retardant silicone rubber.

[0045] In some other embodiments, the connection manner between the connecting portion 12 and the body of the device can also be snap connection, buckle connection, etc. For example, when the connection manner between the connecting portion 12 and the body of the device is snap connection, the first mounting structure 9 can be a snap portion disposed on the outer side of the connecting portion 12, and a snap hole is provided on the body of the device, and the snap portion is snapped into the snap hole, so as to mount the explosion-proof switch on the body of the explosion-proof device.

[0046] Please refer to Figure 2 and Figure 4 , the explosion-proof switch further includes a second protective shell 3 and a button 4. The second protective shell 3 is disposed at one end of the first protective shell 1 away from the lead cable 6 and is located outside the first protective shell 1. A second accommodation cavity 31 is provided in the second protective shell 3, and the switching element 2 is received in the second accommodation cavity 31. A second mounting structure 20 is provided on the outer side of the second protective shell 3, and the second mounting structure 20 is used to fix the second protective shell 3 on the body of the explosion-proof device, so as to mount the explosion-proof switch on the body of the explosion-proof device. The button 4 is slidably assembled in the second protective shell 3 and is received in the second accommodation cavity 31. The button 4 can slide to contact or separate from the switching element 2 to turn on or off the switching element 2, so that the explosion-proof switch can control the start and stop of the explosion-proof electrical appliance through the button 4.

[0047] It should be noted that by disposing the switching element 2 in the first protective shell 1 and the second protective shell 3, and disposing the button 4 in the second protective shell 3, the switching element 2 and the button 4 can be protected by the protective shell, so that when the explosion-proof switch is impacted by energy, the impact on the switching element 2 and the button 4 is small, so that the explosion-proof switch has the function of anti-impact explosion protection. Therefore, when it is mounted on the body of the explosion-proof electrical appliance, there is no need to perform explosion protection treatment on the explosion-proof switch again. When operating the explosion-proof switch, only the button 4 needs to be pressed without other operations, which can simplify the cooperation and use mode between the explosion-proof switch and the explosion-proof electrical appliance.

[0048] It should be understood that when the button 4 slides to be separated from the switch element 2, the end of the button 4 far from the switch element 2 is exposed on the end face of the second protective housing 3, which facilitates pressing the button 4. When the button 4 slides to contact the switch element 2, the end of the button 4 far from the switch element 2 is flush with the end face of the second protective housing 3; wherein, when the explosion-proof switch is subjected to an energy impact, the button 4 will move to be flush with the end face of the second protective housing 3 under the action of pressure. At this time, only one end face of the button 4 is exposed on the outside, which can further reduce the impact on the button 4.

[0049] Please refer to Figure 1 and Figure 2 , in some embodiments, a stepped structure is provided on the outside of the second protective housing 3, and a thread is provided on the outside of the second protective housing 3. The second mounting structure 20 can be a lock nut, and the lock nut is screwed on the outside of the second protective housing 3, and the lock nut abuts against the device body and locks and fixes the device body on the stepped structure of the second protective housing 3.

[0050] It should be noted that when the second protective housing 3 is locked and fixed on the device body of the explosion-proof electrical appliance, the explosion-proof switch is integrally received in the device body, thereby forming an internal-locking explosion-proof switch.

[0051] Please refer to Figure 1 and Figure 2 , the explosion-proof switch further includes a second flame retardant member 30. The second flame retardant member 30 is sleeved on the outside of the second protective housing 3, and the second flame retardant member 30 is used to contact the device body of the explosion-proof device, so as to prevent the explosion-proof switch and the device body from igniting and burning each other; wherein, the second flame retardant member 30 can be made of flame-retardant silicone rubber.

[0052] In other embodiments, the connection manner between the second protective housing 3 and the device body can also be snap connection, buckle connection, etc. For example, when the connection manner between the second protective housing 3 and the device body is snap connection, the second mounting structure 20 can be a snap connection portion provided on the outside of the second protective housing 3, and a snap connection hole is provided on the device body, and the snap connection portion is snapped into the snap connection hole, thereby mounting the explosion-proof switch on the device body of the explosion-proof device.

[0053] Please refer to Figure 2 and Figure 4 , in some embodiments, both the first protective housing 1 and the second protective housing 3 are cylindrical, and the lengths of the first accommodation cavity 111 and the second accommodation cavity 31 both extend along the axial direction; the switch element 2 and the button 4 are both columnar, the length of the switch element 2 extends along the length direction of the first accommodation cavity 111, and the button 4 slides along the length direction of the second accommodation cavity 31. Both the first protective housing 1 and the second protective housing 3 are hardware parts. For example, the first protective housing 1 and the second protective housing 3 can be made of materials such as stainless steel and nickel-plated brass.

[0054] Please refer toFigure 2 and Figure 4 On the inner wall of the first accommodation cavity 111, a first connection structure 112 is provided. The switching element 2 is provided with a second connection structure 23. The first connection structure 112 is connected to the second connection structure 23, thereby fixing the switching element 2 within the first protective housing 1. In a specific example, the first connection structure 112 and the second connection structure 23 are threadedly connected, facilitating the mutual fixation between the switching element 2 and the first protective housing 1. Among them, the first connection structure 112 may be a thread provided on the inner wall of the first accommodation cavity 111, and the second connection structure 23 may be a thread provided on the outer side of the switching element 2.

[0055] It should be noted that the number of threads on the outer side of the switching element 2 is more than the number of threads on the inner wall of the first accommodation cavity 111, which can reduce the processing difficulty of the first protective housing 1. The first limiting boss 21 is annular, and the first limiting boss 21 is sleeved on the outer end of the switching element 2. The outer diameter of the first limiting boss 21 is greater than the diameter of the first accommodation cavity 111, ensuring that the first limiting boss 21 can contact the end of the first protective housing 1. It can be understood that during the process of screwing and connecting the switching element 2 and the first protective housing 1, when the first limiting boss 21 abuts against the end of the first protective housing 1, the switching element 2 and the first protective housing 1 are screwed together in place.

[0056] In some other embodiments, the connection manner between the first connection structure 112 and the second connection structure 23 may be plug connection, snap connection, buckle connection, etc. For example, when the first connection structure 112 and the second connection structure 23 are plug-connected, the first connection structure 112 may be a plug post provided on the inner wall of the first accommodation cavity 111, and the second connection structure 23 may be a plug hole provided on the switching element 2. The plug post is inserted into the plug hole, and the plug post and the plug hole are in interference fit, thereby fixing the switching element 2 and the first protective housing 1 to each other.

[0057] Please refer to Figure 2 and Figure 4 On the first protective housing 1, a third connection structure 113 is provided. On the inner wall of the second accommodation cavity 31, a fourth connection structure 35 is provided. The third connection structure 113 is connected to the fourth connection structure 35, thereby fixing the second protective housing 3 to the first protective housing 1. In a specific example, the third connection structure 113 and the fourth connection structure 35 are threadedly connected, facilitating the mutual fixation between the second protective housing 3 and the first protective housing 1. Among them, the third connection structure 113 may be a thread provided on the outer side of the first protective housing 1, and the fourth connection structure 35 may be a thread provided on the inner wall of the second accommodation cavity 31.

[0058] Please refer to Figure 2 and Figure 4, a second limiting boss 32 is provided on the inner wall of the second accommodating cavity 31. The second limiting boss 32 abuts against one end of the switch element 2 away from the first protective shell 1, thereby preventing the second protective shell 3 from continuing to move downward during the assembly process with the first protective shell 1. Among them, the second limiting boss 32 and the thread on the second accommodating cavity 31 are distributed at intervals. The first limiting boss 21 is provided between the first protective shell 1 and the second limiting boss 32, and the second limiting boss 32 abuts against the side of the first limiting boss 21 away from the first protective shell 1, thereby preventing the switch element 2 from moving upward; moreover, a conical surface is provided on the side of the second limiting platform close to the first protective shell 1, and a conical surface is provided on the side of the first limiting boss 21 away from the first protective shell 1, which facilitates the contact between the first limiting boss 21 and the second limiting boss 32. It can be understood that during the process of screwing and connecting the first protective shell 1 and the second protective shell 3, when the second limiting boss 32 abuts against the first limiting boss 21, the switch element 2 is screwed in place with the first protective shell 1.

[0059] It should be understood that the second protective shell 3 can be understood as a lock nut corresponding to the switch element 2. By setting the second limiting boss 32 to abut against the first limiting boss 21, the switch element 2 is locked and fixed on the first protective shell 1 through the second protective shell 3.

[0060] It should be noted that in some other embodiments, the third connection structure 113 and the fourth connection structure 35 can be inserted, snapped, buckled, etc. For example, when the third connection structure 113 and the fourth connection structure 35 are in a snap-fit, the third connection structure 113 can be a card slot provided on the outer side of the first protective shell 1, and the fourth connection structure 35 can be a snap-in portion provided on the inner wall of the second accommodating cavity 31. The snap-in portion is snapped into the card slot, thereby realizing the mutual fixation between the first protective shell 1 and the second protective shell 3.

[0061] Please refer to Figure 2 and Figure 4 , the second accommodating cavity 31 penetrates through the end face of the second protective shell 3 to form a relief hole 33. The button 4 passes through the relief hole 33 to ensure that the switch element 2 can be exposed on the surface of the second protective shell 3 through the relief hole 33, facilitating the pressing of the button 4; the button 4 is provided with light transmission, and different colored lights can be emitted outward to display the state of the explosion-proof electrical appliance. For example, when the button 4 emits red light outward, it means that the explosion-proof electrical appliance is in a fault state; when the button 4 emits green light outward, it means that the explosion-proof electrical appliance is in a normal working state; among them, the button 4 can be made of transparent acrylic material.

[0062] Please refer to Figure 2 and Figure 4The inner wall of the positioning hole 33 is raised in the radial direction to form a third limiting boss 34, and a fourth limiting boss 41 is provided on the outer side of the button 4. The fourth limiting boss 41 is accommodated in the second accommodating cavity 31, and the fourth limiting boss 41 is slidably assembled on the second protective shell 3; wherein, when the button 4 slides to contact or separate from the switch element 2, the fourth limiting boss 41 is spaced apart or abuts against the third limiting boss 34, which can prevent the button 4 from sliding away from the second protective shell 3.

[0063] According to actual needs, the third limiting boss 34 is arranged around the clearance hole 33, and the fourth limiting boss 41 can be annular and sleeved on the outside of the button 4. A gasket 40 is also sleeved on the outside of the button 4. The gasket 40 is arranged between the third limiting boss 34 and the fourth limiting boss 41, so that the gasket 40 can buffer the collision between the third limiting boss 34 and the fourth limiting boss 41.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An explosion-proof switch, characterized in that, Comprising: A first protective shell, provided with a first accommodating cavity and a wire passing hole, the wire passing hole communicating with the first accommodating cavity; A switching element, disposed on the first protective shell and received in the first accommodating cavity; A first sealing member, sleeved outside the switching element, and the first sealing member is in sealing contact with the switching element and the inner wall of the first accommodating cavity respectively; A lead-out cable, one end of which is connected to the switching element, and the other end passes through the wire passing hole and extends outside the first protective shell; And, A second sealing member, disposed in the wire passing hole, the second sealing member being in sealing contact with the inner wall of the wire passing hole and the lead-out cable respectively.

2. The explosion-proof switch according to claim 1, characterized in that, The second sealing member fills the wire passing hole.

3. The explosion-proof switch according to claim 2, wherein, The diameter of the wire passing hole ranges from 10 mm to 15 mm, and the length of the wire passing hole ranges from 20 mm to 25 mm.

4. The explosion-proof switch according to claim 1, characterized in that, An annular installation groove is provided on the inner wall of the wire passing hole, and the second sealing member is disposed in the installation groove.

5. The explosion-proof switch according to claim 1, characterized in that, A first limiting boss is provided on the outside of the switching element, the first limiting boss abuts against the end of the first protective shell, and the first sealing member is disposed on the side of the first limiting boss close to the lead-out cable.

6. The explosion-proof switch according to claim 1, characterized in that, The first protective shell includes: A main body portion, provided with the first accommodating cavity; and, A connecting portion, provided with the wire passing hole, a first installation structure and a third sealing member are provided on the outside of the connecting portion, the first installation structure is used to fix the connecting portion on the body of the explosion-proof device, and the third sealing member is used to contact the connecting portion and the body of the explosion-proof device respectively.

7. The explosion-proof switch according to claim 6, characterized in that, The explosion-proof switch further includes a first flame retardant member, the first flame retardant member is sleeved outside the connecting portion, the third sealing member is disposed between the first flame retardant member and the connecting portion, and the first flame retardant member is used to contact the body of the explosion-proof device.

8. The explosion-proof switch according to claim 1, characterized in that, The explosion-proof switch further includes: A second protective shell, disposed at one end of the first protective shell away from the lead-out cable and on the outside of the first protective shell, a second accommodating cavity is provided in the second protective shell, and a second installation structure is provided on the outside of the second protective shell, the second installation structure is used to fix the second protective shell on the body of the explosion-proof device; and, A button, slidably assembled in the second protective shell and received in the second accommodating cavity, the button can slide into contact with or separate from the switching element to turn on or off the switching element.

9. The explosion-proof switch according to claim 8, wherein, The explosion-proof switch further includes a second flame retardant member, the second flame retardant member is sleeved outside the second protective shell, and the second flame retardant member is used to contact the body of the explosion-proof device.

10. An explosion-proof electrical appliance, characterized in that, Comprising the explosion-proof switch according to any one of claims 1-9 and the body of the device, the explosion-proof switch is disposed on the body of the device, and the explosion-proof switch is electrically connected to the body of the device.

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