Explosion-proof boxes and electrical equipment

Abstract

To provide an explosion-proof box that ensures airtightness when in use, not only achieves automatic pressure release, but also prevents the main structure, such as a second box or first box, from exploding or breaking, improves safety in use and can reduce repair costs in later stages.SOLUTION: The explosion-proof box is composed of a first box body 10 having a first mounting hole 11 and a second box body 20 covered on the first box body and having a second mounting hole. A fastening device 30 is inserted through the first mounting hole and the second mounting hole to connect the first box body 10 and the second box body 20. A position-limiting member is installed between the first mounting hole and the fastening device, and has a first state and a second state. In the first state, the position limiting member limits the position of a position limiting head 31 of the fastening member to outside the first mounting hole. In the second state, at least part of the position limiting member is separated from the position limiting head, and the position limiting head is inserted into the first mounting hole.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an explosion-proof box and electrical equipment. [Background technology]

[0002] In the related art, when electrical components in electrical equipment that need to meet the sealing conditions, such as capacitors, switches, and relays, experience a short circuit failure, the pressure increases rapidly and may even explode. The explosion pressure increases with increasing power level, voltage, and current, and the enormous pressure generated may cause the first box to burst and even fly apart. Therefore, it is necessary to develop a structure for the first box that can quickly release pressure and ensure explosion resistance. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To achieve this, one object of the present invention is to provide an explosion-proof box that can release pressure in a timely manner and has higher stability and reliability.

[0004] The present invention further provides an electrical device in which the above-mentioned explosion-proof box is employed. [Means for solving the problem]

[0005] An explosion-proof box according to an embodiment of a first aspect of the present invention includes a first box body having a first mounting hole, a second box body, the second box body being covered by the first box body and the second box body having a second mounting hole, a fastener, the fastener being inserted through the first mounting hole and the second mounting hole to connect the first box body and the second box body, and a position limiting member, the position limiting member being installed between the first mounting hole and the fastener, the position limiting member having a first state and a second state, in the first state, the position limiting member being suitable for position-limiting a position-limiting head of the fastener outside the first mounting hole, and in the second state, at least a portion of the position limiting member being separated from the position limiting head so that the position limiting head can be inserted into the first mounting hole. In the explosion-proof box of the embodiment of the present invention, the installation of a position limiting member enables the fastener to be switched between a first state and a second state, thereby ensuring the sealing when the explosion-proof box is in use in the first state, and improving the stability and reliability of the use of the explosion-proof box. In addition, when the pressure inside the explosion-proof box increases, the position limiting member at least partially separates from the position limiting head 31 (causing a structural change), thereby creating a gap between the second box body and the first box body, which not only realizes automatic pressure release, but also prevents the main structures such as the second box body and the first box body from exploding or shattering during the pressure release process, thereby improving the safety of use and reducing later repair costs.

[0006] According to some embodiments of the present invention, the first mounting hole has a first end surface and a second end surface arranged in sequence in an assembly direction, and in the first state, the position-limiting head is located outside the first end surface, and in the second state, the position-limiting head is located outside the second end surface.

[0007] According to some embodiments of the present invention, the position limiting member is configured as a washer, the washer is installed between the first mounting hole and the position limiting head, the washer includes an inner washer ring and an outer washer ring, and a weakened connection is installed between the inner washer ring and the outer washer ring, the weakened connection is suitable for breaking under the action of pressure, so that in the second state, at least a part of the position limiting member is separated from the position limiting head.

[0008] According to some embodiments of the present invention, the position limiting member is configured as a washer, the washer is installed between the first mounting hole and the position limiting head, and a weakened connection is installed on the washer, the weakened connection is suitable for breaking under the action of pressure, so that in the second state, the position limiting member is separated from the position limiting head.

[0009] According to some embodiments of the present invention, the position limiting member is installed at an end of the first mounting hole and connected to the first box body, and a weakened connection is installed between the first box body and the position limiting member, the weakened connection being suitable for breaking under the action of pressure, so that in the second state, the position limiting member is separated from the position limiting head.

[0010] According to some embodiments of the present invention, the position limiting member is mounted on the position limiting head, and a weakened connection is provided between the position limiting head and the position limiting member, the weakened connection being suitable for rupturing under the action of pressure, such that in the second state, the position limiting member is separated from the position limiting head.

[0011] In some embodiments, the weakened connection includes a weakened slit, the thickness of the weakened slit being smaller than the thickness of the position limiting member, thereby allowing at least a portion of the position limiting member to be spaced from the position limiting head.

[0012] Furthermore, the weakened connection portion further includes a weakened groove, which is configured as a through groove to allow at least a portion of the position limiting member to be spaced from the position limiting head.

[0013] Furthermore, a weakening groove is provided between at least two of the weakening slits.

[0014] In some embodiments, the weakened slit is disposed around the axis of the first mounting hole.

[0015] Furthermore, there are a plurality of the weakened grooves, and the weakened grooves are disposed at equal intervals.

[0016] Further, the weakened grooves are configured as annular grooves and are disposed at equal angular intervals around the axis of the first mounting hole.

[0017] According to some embodiments of the present invention, an inner diameter of the first end surface is smaller than an inner diameter of the outer washer race and larger than an outer diameter of the inner washer race.

[0018] In some embodiments, an inner diameter of the second end surface is smaller than an inner diameter of the inner washer race, and an outer diameter of the second end surface is greater than or equal to an outer diameter of the inner washer race.

[0019] Furthermore, one end of the fastener is inserted into the first mounting hole and the second mounting hole, and the outer diameter of the position limiting head is smaller than the inner diameter of the washer outer ring, so that the fastener can be withdrawn after the washer outer ring and the washer inner ring are separated.

[0020] An electric device according to a second embodiment of the present invention includes the explosion-proof box according to the above-mentioned embodiment. Effect of the Invention

[0021] Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and will be readily understood from the following detailed description of the embodiments taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0023] [Figure 1] 2 is a schematic diagram of an explosion-proof box according to an embodiment of the present invention at one angle when in use. FIG. [Diagram 2] 1 is a schematic diagram of an explosion-proof box according to an embodiment of the present invention in use from a different angle. FIG. [Diagram 3] FIG. 3 is a locally enlarged schematic diagram of a region A indicated by a circle in FIG. 2. [Figure 4] 1 is a schematic diagram of an explosion-proof box according to a first embodiment of the present invention at one angle when in a pressure-released state. FIG. [Diagram 5] 2 is a schematic diagram of the explosion-proof box according to the first embodiment of the present invention in a pressure-released state from another angle. FIG. [Figure 6] FIG. 6 is a locally enlarged schematic diagram of a region B indicated by a circle in FIG. 5. [Figure 7] FIG. 2 is a schematic diagram of a first box according to the first embodiment of the present invention. [Figure 8] FIG. 2 is a schematic local cross-sectional view of a first box according to the first embodiment of the present invention. [Figure 9] 1 is a schematic diagram of a washer according to a first embodiment of the present invention. FIG. [Figure 10] FIG. 2 is a schematic diagram showing the state in which the washer and fastener according to the first embodiment of the present invention are assembled at one angle. [Figure 11] 5 is a schematic diagram showing the state in which the washer and fastener according to the first embodiment of the present invention are assembled at a different angle. FIG. [Figure 12] 13 is a schematic diagram of a first box body, a fastener, and a position limiting member according to a second embodiment of the present invention in an assembled state. FIG. [Figure 13] 11 is a schematic diagram of a fastener and a position limiting member according to a second embodiment of the present invention in an assembled state. FIG. [Figure 14] FIG. 11 is a locally enlarged schematic diagram of an explosion-proof box according to a third embodiment of the present invention. [Figure 15] FIG. 13 is a locally enlarged schematic view of an explosion-proof box according to a fourth embodiment of the present invention. [Figure 16] FIG. 13 is a schematic diagram showing a state in which a fastener and a position limiting member according to a fourth embodiment of the present invention are combined. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] In the following, the embodiments of the present invention will be described in detail. The examples of the described embodiments are shown in the drawings, and the same or similar numbers throughout represent the same or similar elements, or elements having the same or similar functions. The following embodiments described with reference to the drawings are illustrative and are only for explaining the present invention, and cannot be understood as limiting the scope of the present invention.

[0025] An explosion-proof box 100 and an electric device according to an embodiment of the present invention will be described below with reference to FIGS.

[0026] As shown in FIGS. 1 to 6 and 12 to 16, in an explosion-proof box 100 according to an embodiment of the first aspect of the present invention, A first box body 10 having a first mounting hole 11; a second box body 20, the second box body 20 being covered by the first box body 10 and the second box body 20 having a second mounting hole 21; A fastener 30, which is provided through the first mounting hole 11 and the second mounting hole 21 to connect the first box body 10 and the second box body 20; The present invention includes a position limiting member 40, the position limiting member 40 being installed between the first mounting hole 11 and the fastener 30, the position limiting member 40 having a first state and a second state, in the first state, the position limiting member 40 being suitable for restricting the position of the position limiting head 31 of the fastener 30 outside the first mounting hole 11, and in the second state, at least a portion of the position limiting member 40 being separated from the position limiting head 31, thereby allowing the position limiting head 31 to be inserted into the first mounting hole 11.

[0027] Specifically, the first box 10 and the second box 20 define an accommodation space, and four first mounting holes 11 may be provided in the four corner regions of the first box 10, and four second mounting holes 21 may be provided in the four corner regions of the second box 20 accordingly, at least a part of the second mounting holes 21 is formed as a screw hole, and the fastener 30 is configured as a screw structural part such as a bolt, a screw, etc., so that it can be inserted into the first mounting hole 11 and screw-fitted into the second mounting hole 21, thereby realizing a fixed connection between the second box 20 and the first box 10, and a washer may be installed between the end face of the first mounting hole 11 and the fastener 30, thereby realizing a seal between the first box 10 and the second box 20.

[0028] Furthermore, as shown in Figures 1 and 3, the explosion-proof box 100 has a use state, and as shown in Figures 4 and 6, the explosion-proof box 100 further has a pressure-released state. In the sealed state, the second box body 20 and the first box body 10 are sealed without any gaps, but in the pressure-released state, there is a gap between the second box body 20 and the first box body 10, and the pressure in the storage space can be released through the gap, thereby improving the safety and reliability of the explosion-proof box 100.

[0029] Correspondingly, when the position limiting member 40 is in the first state, the explosion-proof box 100 is in a use state, in which the position limiting head 31 is located outside the first mounting hole 11, and there is no sealed gap between the first box body 10 and the second box body 20. When the position limiting member 40 is in the second state, the explosion-proof box 100 is in a pressure-release state, in which at least a part of the position limiting member 40 is separated from the position limiting head 31, and the position limiting head 31 is in a free state and can be inserted into the first mounting hole 11, thereby creating a gap between the first box body 10 and the second box body 20 and allowing pressure relief.

[0030] It should be noted that the structural shape of the position limiting member 40 can be varied in a wide variety of ways, and at least four possible structures, from a first embodiment to a fourth embodiment, will be described below as examples, and it will be understood that the first embodiment to the fourth embodiment are possible embodiments of the present invention and do not exhaust all examples.

[0031] Specifically, in the second state, the separation of at least a portion of the position limiting member 40 from the position limiting head 31 may mean that the position limiting member 40 is completely separated from the position limiting head 31 (see the second, third and fourth embodiments), or that a portion of the position limiting member 40 is separated from the position limiting head 31 and another portion continues to engage with the position limiting head 31 and enters the first mounting hole 11 together with the position limiting head 31.

[0032] In the explosion-proof box 100 of the embodiment of the present invention, the position limiting member 40 is installed so that the fastener 30 can be switched between the first state and the second state, thereby ensuring the airtightness when the explosion-proof box 100 is in use in the first state, and improving the stability and reliability of the use of the explosion-proof box 100. In addition, when the pressure inside the explosion-proof box 100 increases, the position limiting member 40 at least partially separates from the position limiting head 31 (causing a structural change), thereby creating a gap between the second box body 20 and the first box body 10. This not only realizes automatic pressure release, but also prevents the main structures such as the second box body 20 and the first box body 10 from exploding or shattering during the pressure release process, thereby improving the safety of use and reducing later repair costs.

[0033] As shown in Figures 3 and 6, an elastic washer 50 may be further installed between the fastener 30 and the first mounting hole 11, which can increase the frictional force and interlocking force of the fastener 30, and improve the stability and reliability of the fastener 30 being fixed to the first box body 10 and the second box body 20.

[0034] As shown in Figures 2, 3, 6, 12 and 15, the first mounting hole 11 has a first end face 111 and a second end face 112 arranged sequentially in the assembly direction, and in a first state, the position-limiting head 31 is located outside the first end face 111, and in a second state, the position-limiting head 31 is located outside the second end face 112.

[0035] Specifically, the first mounting hole 11 or the second mounting hole 21 has a first end surface 111 and a second end surface 112 arranged in sequence in the assembly direction. When the position limiting head 31 abuts against the first end surface 111, the position limiting member 40 is correspondingly in a first state. When the position limiting member 40 is in the second state, the position limiting head 31 abuts against the second end surface 112, so that the explosion-proof box 100 can be switched between a use state and a pressure release state, and the use safety of the explosion-proof box 100 is improved.

[0036] The explosion-proof box 100 of the present invention will be described below by way of example in the first to fourth embodiments.

[0037] As shown in Figures 1 to 11, in the first embodiment, the position limiting member 40 is configured as a washer, and the washer is installed between the first mounting hole 11 and the position limiting head 31, the washer includes a washer inner ring 41 and a washer outer ring 42 which are installed in sequence along the radial direction, and a weakened connection is installed between the washer inner ring 41 and the washer outer ring 42, and the weakened connection is suitable for breaking under the action of pressure, so that in the second state, at least a part of the position limiting member 40 is separated from the position limiting head 31, the washer outer ring 42 is suitable for separating from the washer inner ring 41 under the action of pressure, the washer outer ring 42 is suitable for abutting against the first end face 111, and the washer inner ring 41 is suitable for abutting against the second end face 112.

[0038] For example, in an embodiment in which the fastener 30 is inserted through the first mounting hole 11 and screw-fitted into the second mounting hole 21, the first mounting hole 11 has a first end surface 111 and a second end surface 112 as shown in Figures 7 and 8, the first end surface 111 and the second end surface 112 are installed sequentially in the assembly direction and spaced apart, and the washer outer ring 42 of the corresponding washer may fit closely against the first end surface 111, and at this time, the explosion-proof box 100 is in the use state shown in Figures 1 to 3. And, if the pressure inside the explosion-proof box 100 becomes too high, the pressure will move the second box body 20 away from the first box body 10, and a force will act on the fastener 30 causing the washer outer ring 42 of the washer to move away from the washer inner ring 41, thereby causing the pressure to move the second box body 20 away from the first box body 10, putting the second box body 20 into the pressure-released state shown in Figures 4 to 6, with the washer inner ring 41 fitting closely against the second end face 112.

[0039] In the first embodiment, the explosion-proof box 100 according to the embodiment of the present invention is provided with a first end surface 111 and a second end surface 112, and the washer outer ring 42 and the washer inner ring 41 are closely fitted to the first end surface 111 and the second end surface 112, respectively, thereby ensuring the sealing of the explosion-proof box 100 in use, and improving the stability and reliability of the explosion-proof box 100. In addition, when the pressure inside the explosion-proof box 100 increases, the washer absorbs energy and undergoes a structural change, and the washer inner ring 41 closely fits the second end surface 112, thereby creating a gap between the second box body 20 and the first box body 10. This not only realizes automatic pressure release, but also prevents the main structures such as the second box body 20 and the first box body 10 from exploding or shattering during the pressure release process, thereby improving the safety of use and reducing the repair costs in the later stages.

[0040] As shown in Figures 12 and 13, in the second embodiment, the position limiting member 40 is configured as a washer, the washer is installed between the first mounting hole 11 and the position limiting head 31, and a weakened connection is installed on the washer, the weakened connection is suitable for breaking under the action of pressure, so that in the second state, the position limiting member 40 is separated from the position limiting head 31.

[0041] In other words, the second embodiment can achieve the same technical effect as the first embodiment, but the difference lies in the difference between the washer structure of the position limiting member 40 in the second embodiment and the washer structure of the first embodiment; specifically, the washer structure of the position limiting member 40 in the second embodiment only realizes position limiting in the first state, and does not function in the second state, and is separated from the fastener 30.

[0042] As shown in FIG. 14 , in the third embodiment, a position limiting member 40 is installed at the end of the first mounting hole 11 and connected to the first box body 10, and a weakened connection is installed between the first box body 10 and the position limiting member 40, which is suitable for breaking under the action of pressure, so that in the second state, the position limiting member 40 is separated from the position limiting head 31.

[0043] Specifically, the second embodiment can achieve the same technical effect as the first embodiment, but the difference between the second embodiment and the first and second embodiments is that the position limiting member 40 is installed on the first box body 10 and is not installed separately, and the position limiting member 40 is completely separated from the position limiting head 31 in the second state.

[0044] As shown in Figures 15 and 16, in the fourth embodiment, a position limiting member 40 is installed on the position limiting head 31, and a weakened connection is installed between the position limiting head 31 and the position limiting member 40, the weakened connection is suitable for breaking under the action of pressure, so that in the second state, the position limiting member 40 is separated from the position limiting head 31.

[0045] Among them, the fourth embodiment can achieve the same technical effect as the first embodiment, but the difference between the fourth embodiment and the first, second and third embodiments is that the position limiting member 40 is set on the position limiting head 31 of the fastener 30, and is not installed separately, and the position limiting member 40 is completely separated from the position limiting head 31 in the second state.

[0046] In summary, in any of the first, second, third and fourth embodiments, the position limiting member 40 includes a weakened connection, and the position limiting member 40 itself is configured as a crushable divided structure and is connected via the weakened connection (first embodiment), or the position limiting member 40 realizes its own crushing or disassembly via the weakened connection (second embodiment), or the position limiting member 40 is connected to surrounding parts via the weakened connection (for example, connected to the first box body 10 in the third embodiment, and connected to the fastener 30 in the fourth embodiment). In all these cases, the position limiting member 40 can be switched between the first state and the second state, thereby allowing the explosion-proof box 100 to be switched between a use state and a pressure release state, reducing repair costs and improving use safety.

[0047] In some embodiments, as shown in Figures 9, 13, 14 and 16, the weakened connection includes a weakened slit, the thickness of the weakened slit being less than the thickness of the position limiting member, thereby allowing at least a portion of the position limiting member to be spaced from the position limiting head.

[0048] Specifically, as shown in FIG. 9 , in the first embodiment, a weakened connection is provided between the inner washer ring 41 and the outer washer ring 42, and the weakened connection is suitable for breaking under the action of pressure, thereby allowing the inner washer ring 41 to separate from the outer washer ring 42.

[0049] The washer has a generally annular shape, a central through hole for receiving fastener 30, and includes a first annular portion and a second annular portion disposed radially therearound, the first annular portion being defined as inner washer ring 41, and the second annular portion being defined as outer washer ring 42. A weakened connection may be provided between outer washer ring 42 and inner washer ring 41, and when pressure on the washer exceeds a threshold value, the weakened connection may break, crush or deform, causing inner washer ring 41 to break. 1. The washer outer ring 42 having a larger diameter can be separated from the fastener 30 or at least partially separated from the fastener 30 after the larger diameter washer outer ring 42 is separated. Correspondingly, under the action of pressure in the explosion-proof box 100, the fastener 30 and the washer inner ring 41 move to engage with the second end face 112, so that only the washer breaks during the pressure release process of the explosion-proof box 100, thereby reducing the pressure release cost of the explosion-proof box 100, preventing the rupture of the first box body 10 or the second box body 20, and reducing the repair cost at a later stage.

[0050] As shown in Fig. 13, in the second embodiment, the weakening slit 43 extends along the radial direction of the washer, and reduces the structural strength of the washer itself, and the washer is broken into one or more pieces, thereby enabling the switch between the first state and the second state. As shown in Fig. 14, in the third embodiment, the weakening slit 43 may be provided to surround the connection area of ​​the position limiting member 40 and the first box body 10, and the connection strength of the first box body 10 and the position limiting member 40 is reduced, thereby enabling the switch between the first state and the second state. As shown in Fig. 16, in the fourth embodiment, the weakening slit 43 is provided to surround the connection area of ​​the position limiting member 40 and the fastener 30, and the connection strength of the fastener 30 and the position limiting member 40 is reduced, thereby enabling the switch between the first state and the second state.

[0051] As a result, by installing the weakening slits 43, the strength of the position limiting member 40 is reduced, and when the pressure inside the explosion-proof box 100 reaches a safety threshold, the position limiting member 40 ruptures or crushes in a timely manner, thereby achieving timely pressure release and explosion prevention, and improving the safety of using the explosion-proof box 100.

[0052] Specifically, the outline of the projection range of the weakening slit 43 in the thickness direction of the washer is formed as a sawtooth or curved shape, and the weakening slit 43 may be formed as a recess, thereby realizing a weakened connection between the outer washer ring 42 and the inner washer ring 41. In addition, it is ensured that the inner washer ring 41 and the outer washer ring 42 are not easily deformed or broken in the use state, and the stability and reliability of the explosion-proof box 100 in the use state can be improved.

[0053] And the weakened connection further includes a weakened groove 44, which is configured as a through groove to allow at least a part of the position limiting member 40 to be separated from the position limiting head 31. This allows the structural strength of the position limiting member 40 to be further weakened through the weakened groove 44, so that the position limiting member 40 can be switched to the second state in a timely manner, and improves the stability and reliability of the pressure release of the explosion-proof box 100.

[0054] As shown in Fig. 9, preferably, a weakening groove 44 is provided between at least two weakening slits 43. For example, in the first embodiment, the structural strength of the position limiting member 40 can be effectively reduced through the engagement of the weakening slits 43 and the weakening grooves 44. In addition, in the third embodiment, as shown in Fig. 13, the weakening slits 43 are entirely replaced with the weakening grooves 44, or the weakening slits 43 are connected to the weakening grooves 44 in the radial direction of the washer, so that the structural strength of the position limiting member 40 can be effectively reduced in the same manner.

[0055] Further, in some embodiments, the weakened grooves 44 are multiple and spaced apart.

[0056] For example, the weakened grooves 44 may extend along the radial direction and may be provided in a plurality of positions. The weakened grooves 44 may be spaced apart along the axis of the first mounting hole 11, and the weakened grooves 44 may also be configured as annular grooves and may be disposed at equal angular intervals around the axis of the first mounting hole 11.

[0057] This makes the circumferential force distribution of the position limiting member 40 more uniform, and increases the consistency of the force in each area, thereby improving the sealing effect of the position limiting member 40 when the explosion-proof box 100 is in use, and also improves the reaction sensitivity during the process of the explosion-proof box 100 switching to the pressure release state, thereby achieving both the sealing ability and the safety of use of the explosion-proof box 100.

[0058] It will be appreciated that in the first embodiment, the weakened groove 44 is formed as an annular groove and disposed around the axis of the washer, thereby allowing the inner washer ring 41 and the outer washer ring 42 to at least partially separate from each other. This allows the pressure threshold required for the separation of the inner washer ring 41 and the outer washer ring 42 to coincide with the pressure release threshold of the explosion-proof box 100, thereby ensuring timely pressure release by the explosion-proof box 100 and improving the use safety of the explosion-proof box 100.

[0059] Furthermore, in the first embodiment, the weakened connection portion includes a weakened slit 43, which is arranged around the axis of the washer, the weakened slit 43 is connected to the inner washer ring 41 and the outer washer ring 42, and the thickness of the weakened slit 43 is smaller than the thickness of the inner washer ring 41 and the thickness of the outer washer ring 42, thereby reducing the connection strength between the outer washer ring 42 and the inner washer ring 41.

[0060] 7, 8 and 9, in a first embodiment, according to some embodiments of the present invention, the inner diameter of the first end face 111 is smaller than the inner diameter of the outer washer ring 42 and larger than the outer diameter of the inner washer ring 41. And, the inner diameter of the second end face 112 is smaller than the inner diameter of the inner washer ring 41, and the outer diameter of the second end face 112 is equal to or larger than the outer diameter of the inner washer ring 41.

[0061] As a result, after the washer outer ring 42 is separated, the fastener 30 and the washer inner ring 41 are pressed against the second end face 112 under the action of pressure, and the outer diameter of the second end face 112 is greater than or equal to the outer diameter of the washer inner ring 41, and the inner diameter of the second end face 112 is less than the inner diameter of the washer inner ring 41, so that the washer inner ring 41 and the second end face 112 fit together more closely, thereby ensuring the reliability and stability of the connection between the first box body 10 and the second box body 20 by the fastener 30 in the pressure released state, and preventing the first box body 10 from separating from the second box body 20 in the pressure released state.

[0062] As shown in Figures 10 and 11, in some embodiments of the present invention, one end of fastener 30 is inserted into first mounting hole 11 and second mounting hole 21, and the outer diameter of position limiting head 31 is smaller than the inner diameter of washer outer ring 42, thereby allowing fastener 30 to be withdrawn after washer outer ring 42 and washer inner ring 41 are separated.

[0063] This allows the position limiting head 31 to be removed from the washer outer ring 42, and prevents the washer outer ring 42, which has separated from the washer inner ring 41, from interfering with the pressure release process during the pressure release process, thereby improving the stability and reliability when switching the explosion-proof box 100 from its use state to its pressure release state.

[0064] The electric device according to the second embodiment of the present invention includes the explosion-proof box 100 according to the above embodiment.

[0065] For example, the electrical equipment is equipment such as a generator, a transformer, a circuit breaker, etc., and its main functional components are installed within the accommodation space of the explosion-proof box 100 to realize sealing from the outside world. Furthermore, when a short circuit or disconnection occurs and the pressure inside the explosion-proof box 100 increases, the pressure can be quickly released through the structure of the position limiting member 40 described above, thereby improving the safety and reliability of the electrical equipment.

[0066] In describing the present invention, it will be understood that orientations or positional relationships designated as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientations and positional relationships shown in the figures, and are merely for purposes of illustrating and simplifying the description of the present invention, and do not indicate or imply that the devices or elements designated must have a particular orientation or be constructed and operated in a particular orientation, and therefore may not be considered as limitations of the present invention.

[0067] In the description of the present invention, a "first feature" or a "second feature" may include one or more of such features.

[0068] In describing the present invention, "plurality" means two or more than two.

[0069] In describing the present invention, when a first feature is "on" or "under" a second feature, this can include whether the first feature and the second feature are in direct contact, or whether they are not in direct contact but are in contact through another feature between them.

[0070] For purposes of this invention, a first feature being "on", "above" or "above" a second feature includes the first feature being directly above or diagonally above the second feature, or simply the first feature being higher than the horizontal height of the second feature.

[0071] In the description of this specification, the reference words "one embodiment," "some embodiments," "exemplary embodiments," "example," "example," or "some examples" mean that the specific feature, structure, material, or characteristic described with reference to the example or example is included in one or more of the examples or examples of the present invention. The denotative expressions of the above terms in this specification do not necessarily refer to the same example or example. Furthermore, the specific feature, structure, material, or characteristic may be combined in any suitable manner in any one or more of the examples or examples.

[0072] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is limited only by the claims and their equivalents. [Explanation of symbols]

[0073] 100 Explosion-proof box 10 First box 11 First mounting hole 111 First end face 112 Second end face 20 Second box 21 Second mounting hole 30 Fasteners 31 Position restriction head 40 Position limiting member 41 Washer inner ring 42 Washer outer ring 43 Weakened slit 44 Weakening groove 50 Elastic washer

Claims

1. In the explosion-proof box, A first box body (10) having a first mounting hole (11); a second box body (20), the second box body (20) being covered by the first box body (10) and the second box body (20) having a second mounting hole (21); A fastener (30), the fastener (30) being provided through the first mounting hole (11) and the second mounting hole (21) to connect the first box body (10) and the second box body (20); an explosion-proof box comprising: a position limiting member (40) that is installed between the first mounting hole (11) and the fastener (30), the position limiting member (40) having a first state and a second state, in the first state, the position limiting member (40) is suitable for limiting the position of a position limiting head (31) of the fastener (30) outside the first mounting hole (11), and in the second state, at least a portion of the position limiting member (40) is separated from the position limiting head (31) so that the position limiting head (31) can be inserted into the first mounting hole (11).

2. The explosion-proof box according to claim 1, wherein the first mounting hole (11) has a first end face (111) and a second end face (112) arranged in sequence in an assembly direction, and in the first state, the position-limiting head (31) is located outside the first end face (111), and in the second state, the position-limiting head (31) is located outside the second end face (112).

3. 3. The explosion-proof box according to claim 2, wherein the position limiting member (40) is configured as a washer, the washer is installed between the first mounting hole (11) and the position limiting head (31), the washer includes an inner washer ring (41) and an outer washer ring (42), and a weakened connection is installed between the inner washer ring (41) and the outer washer ring (42), the weakened connection is suitable for breaking under the action of pressure, so that in the second state, at least a part of the position limiting member (40) is separated from the position limiting head (31).

4. 3. The explosion-proof box according to claim 2, wherein the position limiting member (40) is configured as a washer, the washer is installed between the first mounting hole (11) and the position limiting head (31), and a weakened connection is installed in the washer, the weakened connection being suitable for breaking under the action of pressure, so that in the second state, the position limiting member (40) moves away from the position limiting head (31).

5. The explosion-proof box according to claim 2, wherein the position limiting member (40) is installed at an end of the first mounting hole (11) and connected to the first box body (10), and a weakened connection is installed between the first box body (10) and the position limiting member (40), the weakened connection being suitable for breaking under the action of pressure, so that in the second state, the position limiting member (40) moves away from the position limiting head (31).

6. 3. The explosion-proof box according to claim 2, wherein the position limiting member (40) is installed on the position limiting head (31), and a weakened connection is installed between the position limiting head (31) and the position limiting member (40), the weakened connection being suitable for breaking under the action of pressure, so that in the second state, the position limiting member (40) moves away from the position limiting head (31).

7. The explosion-proof box according to any one of claims 3 to 6, wherein the weakened connection portion includes a weakened slit (43), the thickness of which is smaller than the thickness of the position limiting member (40), thereby allowing at least a portion of the position limiting member (40) to be separated from the position limiting head (31).

8. The explosion-proof box according to claim 7, wherein the weakened connection further includes a weakened groove (44), the weakened groove (44) being configured as a through groove to allow at least a portion of the position limiting member (40) to be spaced apart from the position limiting head (31).

9. 9. The explosion-proof box according to claim 8, wherein a weakening groove (44) is provided between at least two of said weakening slits (43).

10. The explosion-proof box according to claim 7, wherein the weakening slits (43) are arranged around the axis of the first mounting hole (11).

11. The explosion-proof box according to claim 8, wherein the weakened grooves (44) are plural, and the weakened grooves (44) are arranged at equal intervals.

12. 12. The explosion-proof box according to claim 11, wherein the weakened grooves (44) are configured as annular grooves and are arranged at equal angular intervals around the axis of the first mounting hole (11).

13. The explosion-proof box according to claim 3, wherein an inner diameter of the first end face (111) is smaller than an inner diameter of the washer outer ring (42) and larger than an outer diameter of the washer inner ring (41).

14. 4. The explosion-proof box according to claim 3, wherein the inner diameter of the second end face (112) is smaller than the inner diameter of the washer inner ring (41), and the outer diameter of the second end face (112) is equal to or larger than the outer diameter of the washer inner ring (41).

15. The explosion-proof box according to claim 3, wherein one end of the fastener (30) is inserted into the first mounting hole (11) and the second mounting hole (21), and the outer diameter of the position limiting head (31) is smaller than the inner diameter of the washer outer ring (42), so that the fastener (30) can be pulled out after the washer outer ring (42) and the washer inner ring (41) are separated.

16. An electrical device comprising the explosion-proof box according to any one of claims 1 to 6.

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