A pressure relief device for outdoor sealed electrical box

Abstract

The present invention relates to a pressure relief device for an outdoor sealed electrical box, and belongs to the technical field of outdoor electrical equipment. The electrical box is provided with a pressure relief port, and the pressure relief port is provided with a pressure relief device; the pressure relief device includes a rubber cover with a waterproof ring, a gland and a mounting nut; a gland is provided on the pressure relief port, and the gland is arranged on the inner part of the box body and connected to the mounting nut; the gland is arranged on the outer part of the box body and connected to the rubber cover with a waterproof ring. The present invention overcomes the defects of the existing electrical box quick pressure relief device through the structural design of a waterproof structure, an anti-slip structure and an integrally formed structure, so that the pressure relief device not only meets the IP65 level protection requirements, but also can be reused.

Description

Technical Field

[0001] The invention relates to a pressure relief device for an outdoor sealed electrical box, belonging to the technical field of outdoor electrical equipment. Background Art

[0002] When an accident occurs inside existing outdoor sealed electrical boxes, photovoltaic inverters and other electrical products, resulting in short circuits, thermal runaway and other events, the gas inside the shell is heated to a very high temperature and the pressure rises sharply. Usually, a breather valve is installed in the sealed box, which can effectively balance the pressure difference between the inside and outside when the pressure changes smoothly. However, when the internal pressure rises sharply, the breather valve cannot relieve the pressure in time, which will cause the shell to bulge and deform. In severe cases, the screws locking the structural parts will break and fly out, which is very likely to damage other surrounding equipment and even endanger personal safety.

[0003] The existing quick pressure relief devices for electrical boxes generally adopt the method of thin plate deformation or hinged cover. The deformed thin plate type device cannot be reused after pressure relief, and the hinged cover type generally cannot meet the IP65 level protection. Therefore, the technical field urgently needs to design a pressure relief device that meets the IP65 level protection requirements and is reusable to address the defects of the existing quick pressure relief devices for electrical boxes. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem of how to overcome the defects of the existing electrical box quick pressure relief device so that the pressure relief device can meet the IP65 level protection requirements and be reusable.

[0005] In order to achieve the purpose of solving the above-mentioned problems, the technical solution adopted by the present invention is to provide a pressure relief device for an outdoor sealed electrical box, wherein the box is provided with a pressure relief port, and the pressure relief port is provided with a pressure relief device; the pressure relief device comprises a rubber cover with a waterproof ring, a gland and a mounting nut; a gland is provided on the pressure relief port, and the part of the gland located on the inner side of the box is connected to the mounting nut; the part of the gland located on the outer side of the box is connected to the rubber cover with a waterproof ring.

[0006] Preferably, the mounting nut abuts against the inner wall of the box body.

[0007] Preferably, the cable gland is provided with a passage leading to the outside of the box body, and a rubber cover with a waterproof ring is provided in the passage.

[0008] Preferably, the rubber cover with waterproof ring comprises a waterproof ring and a rubber cover; the waterproof ring is set to be a cylindrical shape with an opening at the bottom, and the top of the waterproof ring is connected to the rubber cover; the outer diameter of the cylindrical wall of the waterproof ring matches the inner diameter of the gland channel.

[0009] Preferably, the diameter of the rubber cover is larger than the inner diameter of the gland channel.

[0010] Preferably, a protrusion for clamping the inner wall of the gland channel is provided on the outer side wall of the waterproof ring.

[0011] Preferably, a rubber cover sealing ring is provided between the cable gland and the outer side wall of the box body, and an anti-drop connection piece is provided between the rubber cover sealing ring and the rubber cover.

[0012] Preferably, the rubber cover is provided with a hook for clamping the outer side wall of the cable gland.

[0013] Preferably, the rubber cover, waterproof ring, anti-drop connector, protrusion, hook and rubber cover sealing ring are provided as an integrally formed part.

[0014] Preferably, there are one or more pressure relief devices.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The rubber cover of the present invention relies on the friction force generated by the radial compression of the waterproof ring, the engagement of the hook and protrusion of the flange with the Gland to resist the vibration caused by transportation and working conditions, thereby ensuring the waterproof performance and pressure relief capacity of the pressure relief device. The rubber cover and the waterproof ring are integrally formed. When the rubber cover is depressurized and pops out, the anti-drop connector can prevent the danger caused by the rubber cover flying out or falling around. The present invention overcomes the defects of the existing electrical box quick pressure relief device, so that the pressure relief device not only meets the IP65 level protection requirements, but also can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the components of the present invention;

[0018] Figure 2 The structure of the present invention when installed is shown in FIG. Figure 1 ;

[0019] Figure 3 The structure of the present invention when installed is shown in FIG. Figure 2 ;

[0020] Figure 4 This is a schematic diagram of the structure of the present invention during pressure relief;

[0021] Figure 5 It is a schematic diagram of the structure of the pressure relief device in the embodiment;

[0022] Figure numerals: 1. Mounting nut; 2. Gland; 3. Rubber cover with waterproof ring; 4. Pressure relief device; 5. Anti-drop connector; 6. Hook; 7. Protrusion; 8. Rubber cover sealing ring; 9. Waterproof ring; 10. Rubber cover; 11. Pressure relief port. DETAILED DESCRIPTION

[0023] In order to make the present invention more clearly understood, a preferred embodiment is described in detail with reference to the accompanying drawings as follows:

[0024] like Figure 1-5 As shown, the present invention provides a pressure relief device for an outdoor sealed electrical box, wherein a pressure relief port 11 is provided on the box, and a pressure relief device 4 is provided on the pressure relief port 11; the pressure relief device 4 comprises a rubber cover 3 with a waterproof ring, a Gland gland 2 and a mounting nut 1; a Gland gland 2 is provided on the pressure relief port 11, and the portion of the Gland gland 2 located inside the box is connected to the mounting nut 1; the portion of the Gland gland 2 located outside the box is connected to the rubber cover 3 with a waterproof ring. The mounting nut 1 abuts against the inner wall of the box. The Gland gland 2 is provided with a channel leading to the outside of the box, and a rubber cover 3 with a waterproof ring is provided in the channel. The rubber cover 3 with a waterproof ring comprises a waterproof ring 9 and a rubber cover 10; the waterproof ring 9 is set in a cylindrical shape with an opening at the bottom, and the top of the waterproof ring 9 is connected to the rubber cover 10; the outer diameter of the cylindrical wall of the waterproof ring 9 matches the inner diameter of the Gland gland 2 channel. The diameter of the rubber cover 10 is larger than the inner diameter of the gland channel. A protrusion 7 for clamping the inner wall of the gland channel is provided on the outer wall of the waterproof ring 9. A rubber cover sealing ring 8 is provided between the gland 2 and the outer wall of the box body, and an anti-drop connector 5 is provided between the rubber cover sealing ring 8 and the rubber cover 10. The rubber cover 10 is provided with a hook 6 for clamping the outer wall of the gland. The rubber cover 10, the waterproof ring 9, the anti-drop connector 5, the protrusion 7, the hook 6 and the rubber cover sealing ring 8 are provided as an integral molding. The pressure relief device 4 is one or more.

[0025] Installation description:

[0026] like Figure 2 As shown; put the rubber cover sealing ring 8 connected to the rubber cover 10 on the Gland gland 2, then install the Gland gland 2 into the pressure relief opening on the box shell, and lock the Gland gland 2 on the shell with the mounting nut 1. Insert the rubber cover 10 into the Gland gland 2 channel and flatten it to complete the assembly.

[0027] like Figure 3 As shown, the rubber cover 10 is provided with a rubber cover sealing ring 8, which is used to seal between the Gland gland 2 and the housing. The rubber cover 10 and the Gland gland 2 form a radial seal by means of the protrusion 7. In addition, the rubber cover 10 can also be provided with a flange to block rainwater.

[0028] like Figure 4 The anti-loosening and falling ability of the rubber cover 10 shown:

[0029] The rubber cover 10 can resist the vibration caused by transportation and working conditions by relying on the friction force generated by the radial compression of the waterproof ring 9, the engagement of the hook 6 of the flange and the Gland gland 2, and the engagement of the protrusion 7 and the Gland gland 2, thereby ensuring waterproof performance and pressure relief capacity. The rubber cover 10 is integrally formed with the waterproof ring 9. When the rubber cover 10 is depressurized and pops out, the anti-drop connector 5 can prevent the rubber cover 10 from flying out or falling around. According to the test results, the pressure relief opening pressure is about 0.3Mpa.

[0030] Example

[0031] like Figure 5 As shown; a pressure relief device 4 of the present invention is installed on the bottom frame of the 125KW all-in-one machine. The pressure relief device 4 is installed in the closed space of the bottom frame, and there is an opening on the side of the base to complete the assembly of the pressure relief device 4.

[0032] This model has been tested by UV, high and low temperature cycle, transportation and handling, drop, waterproof and vibration. The pressure relief device 4 is waterproof and the rubber cover 10 is not loose. When the box is inflated to 0.3MPa, the rubber cover 10 of the pressure relief device 4 will pop open to complete the pressure relief action.

[0033] According to different box sizes and pressure relief requirements, several pressure relief devices 4 can be used together.

[0034] The present invention overcomes the defects of the existing quick pressure relief device of the electrical box through the waterproof structure of the rubber cover sealing ring 8, the radial sealing waterproof structure of the rubber cover 10, the anti-slip structure of the rubber cover 10, the integrally formed structure of the rubber cover 10 and the waterproof ring 9, the use of large plastic nuts, which can generate sufficient pre-tightening force, and the structural design of the Gland mesh cover for preventing the inside from accidentally touching the rubber cover, so that the pressure relief device can meet the IP65 level protection requirements and be reused.

[0035] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A pressure relief device for an outdoor sealed electrical box, wherein the box is provided with a pressure relief port, and the pressure relief port is provided with a pressure relief device; the characteristics are: The pressure relief device includes a rubber cover with a waterproof ring, a gland and a mounting nut; a gland is provided on the pressure relief port, and the portion of the gland located inside the box body is connected to the mounting nut; the portion of the gland located outside the box body is connected to the rubber cover with a waterproof ring; The outer wall of the waterproof ring is provided with a protrusion for clamping the inner wall of the gland channel; A rubber cover sealing ring is provided between the cable gland and the outer side wall of the box body, and an anti-drop connection piece is provided between the rubber cover sealing ring and the rubber cover; The rubber cover is provided with a hook for clamping the outer side wall of the cable gland; The rubber cover, waterproof ring, anti-drop connector, protrusion, hook and rubber cover sealing ring are formed as an integral part; The rubber cover and the gland form a radial seal by means of the bulge; The rubber cover relies on the friction generated by the radial compression of the waterproof ring, the engagement of the hook of the flange with the gland, and the engagement of the protrusion with the gland to resist the vibration caused by transportation and working conditions; When the box is inflated to 0.3MPa, the rubber cover of the pressure relief device pops open, completing the pressure relief action.

2. A pressure relief device for an outdoor sealed electrical box according to claim 1, characterized in that: The mounting nut abuts against the inner wall of the box body.

3. A pressure relief device for an outdoor sealed electrical box according to claim 1, characterized in that: The cable gland is provided with a passage leading to the outside of the box body, and a rubber cover with a waterproof ring is provided in the passage.

4. A pressure relief device for an outdoor sealed electrical box according to claim 1, characterized in that: The rubber cover with waterproof ring comprises a waterproof ring and a rubber cover; the waterproof ring is set to be a cylindrical shape with an opening at the bottom, and the top of the waterproof ring is connected to the rubber cover; the outer diameter of the cylindrical wall of the waterproof ring matches the inner diameter of the gland channel.

5. A pressure relief device for an outdoor sealed electrical box according to claim 1, characterized in that: The diameter of the rubber cover is greater than the inner diameter of the gland channel.

6. A pressure relief device for an outdoor sealed electrical box according to any one of claims 1 to 5, characterized in that: The number of the pressure relief devices is one or more.

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