Novel piston type explosion-proof device for inverter

Abstract

The utility model discloses a novel piston type explosion-proof device for an inverter. The novel piston type explosion-proof device comprises an upper cover assembly, a bracket assembly, an internal sealing ring, a main body, a connecting piece, a spring, a screw and an external sealing ring, the upper cover assembly comprises an upper cover and a magnetic piece. The upper cover comprises a top plate, a first annular ring, a second annular ring and a plurality of arc-shaped pressing blocks; the multiple arc-shaped pressing blocks are evenly arranged along the annular face of the bottom end of the second annular ring at equal intervals, and a first gas circulation channel is formed between every two adjacent arc-shaped pressing blocks. The support assembly comprises a support and a breathable film. The support comprises a support bottom plate, the outer edge of the support bottom plate protrudes upwards in the axial direction to form a third annular ring, and a plurality of second gas circulation channels are formed in the third annular ring in the radial direction; and an arc-shaped pressing block at the bottom of the second annular ring presses the breathable film, so that the first gas circulation channel is communicated with the second gas circulation channel. The part types, the product manufacturing difficulty and the manufacturing time can be reduced, and the manufacturing cost is saved.

Description

Technical Field

[0001] The utility model relates to a piston type explosion-proof device, in particular to a novel piston type explosion-proof device used on an inverter. Background Art

[0002] The photovoltaic inverter is the core component of the photovoltaic power generation system. It is not only responsible for converting direct current into alternating current, but also monitors and controls the operation of the photovoltaic system to ensure power generation efficiency and system stability. The photovoltaic inverter also has functions such as maximum power point tracking and islanding effect protection to improve the overall performance of the photovoltaic system.

[0003] During operation, the photovoltaic inverter may lose balance due to various reasons, which may cause safety hazards and require balancing the internal and external pressures. After installing this explosion-proof device, the gas will flow from the high-pressure side to the low-pressure side, that is, when the pressure inside the cavity is greater than the pressure outside the cavity, the gas will be discharged outward, and when the pressure inside the cavity is less than the pressure outside the cavity, the gas will enter the inner cavity to achieve internal and external pressure balance and keep the inverter running stably. When the pressure inside the cavity is greater than or equal to the explosion value set by the explosion-proof valve, the internal pressure will push open the upper cover of the bracket, and the gas will pass directly to the outside through an unobstructed channel to achieve rapid gas discharge, thereby quickly reducing the pressure inside the cavity and preventing the cavity from exploding.

[0004] The existing technology has a complex structure and many parts. The assembly method requires precise alignment, which increases labor time and material costs. Fig.10 As shown: stick the breathable membrane 3 to the corresponding slot of the bracket 4, then press the pressure ring 202 into the bracket slot through interference fit to press the breathable membrane 3, stick the magnetic sheet 202 to the upper cover 201, and then stick the upper cover 201 and the bracket 4 together. Install the internal sealing ring 5 into the corresponding slot of the main body 6, install the bracket 4 into the main body 6, and press the internal sealing ring 5. The back of the main body 6 will expose the threads on the bracket, then screw the connector 7 and the threads of the bracket together to fix them, then put the spring 8 into the connector 7, then screw the screw 9 into the connector 7 to press the spring 8, and then press the protective cover 101 into the corresponding cylinder of the main body 6. Finally, install the external sealing ring 10 into the main body. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model provides a new piston-type explosion-proof device for an inverter. By improving the structure of the upper cover and the magnetic suction plate, the types of parts can be reduced, the difficulty of product manufacturing and the manufacturing hours can be reduced, thereby saving manufacturing costs.

[0006] The technical solution of the utility model is: a new piston-type explosion-proof device for an inverter, comprising an upper cover assembly, a bracket assembly, an internal sealing ring, a main body, a connecting piece, a spring, a screw and an external sealing ring;

[0007] The upper cover assembly comprises an upper cover and a magnetic sheet;

[0008] The upper cover comprises a top plate, a first annular ring, a second annular ring and a plurality of arc-shaped pressing blocks; the top surface of the first annular ring is connected to the outer edge of the top plate as a whole; the second annular ring is coaxially arranged with the first annular ring, and the top surface of the second annular ring is also integrally fixedly connected to the lower surface of the top plate; the plurality of arc-shaped pressing blocks are evenly arranged at equal distances along the bottom annular surface of the second annular ring, and a first gas flow channel is formed between adjacent arc-shaped pressing blocks;

[0009] The magnetic sheet is placed on the lower surface of the upper cover inside the second annular ring;

[0010] The support assembly comprises a support and a breathable membrane;

[0011] The bracket comprises a bracket bottom plate, a third annular ring protrudes upward along the axial direction on the outer edge of the bracket bottom plate, and a plurality of second gas flow channels are radially opened on the third annular ring; a bracket bottom center hole is opened at the center of the bracket bottom plate, and a connecting pipe with an external thread is integrally connected to the bottom of the bracket bottom center hole;

[0012] The breathable membrane is placed on the upper surface of the bracket bottom plate inside the third annular ring;

[0013] The upper cover assembly is adsorbed on the top of the bracket assembly through a magnetic attraction sheet, and the second annular ring of the upper cover is pressed on the inner side of the third annular ring of the bracket by interference fit, and the arc-shaped pressing block at the bottom of the second annular ring presses the breathable membrane, so that the first gas circulation channel is connected with the second gas circulation channel.

[0014] Furthermore, a connection hole is provided at the central axis position of the main body, and a plurality of explosion-proof vent holes are provided at non-central axis positions of the main body along the central axis direction;

[0015] The connecting pipe at the bottom of the bracket is inserted into the connecting hole;

[0016] Both ends of the connecting piece are provided with internal threads, the inner end is inserted into the connecting hole and fixedly connected with the connecting pipe, the outer end is sleeved with a spring, and the end of the outer end is connected and fixed with a compression spring by a screw;

[0017] An inner sealing ring is arranged on the top of the main body, and an outer sealing ring is arranged on the bottom of the main body.

[0018] Furthermore, it also includes a protective sleeve; the protective sleeve is arranged on the outer end of the connecting piece and the outer side of the screw.

[0019] Furthermore, four second gas flow channels are evenly arranged in the radial direction on the third annular ring.

[0020] The beneficial effects of the utility model are:

[0021] 1. Reduce parts and eliminate the pressing ring in the prior art.

[0022] 2. Reduce the assembly difficulty and product failure risk of existing technologies. The grooves on the existing magnetic sheet must be aligned with the four ventilation grooves on the bracket to achieve ventilation. Improper installation will block the ventilation holes on the bracket and make the entire product invalid. Simplify the design, change the magnetic sheet to a round shape and do not need to align with the grooves on the bracket to achieve stable ventilation.

[0023] 3. Through the coordination of the new structure of the upper cover, magnetic sheet, breathable membrane, bracket, internal sealing ring, main body, connector, spring, screw, protective cover and external sealing ring, the cost is lower than that of the existing technology, and the function and effect are more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an explosion diagram of a new piston-type explosion-proof device used on an inverter in this embodiment;

[0025] FIG. 2( a ) is a schematic diagram of the structure of the upper cover and the magnetic sheet in this embodiment;

[0026] FIG2( b ) is a schematic diagram of the structure of the upper cover assembly in this embodiment;

[0027] FIG3( a ) is a schematic diagram of the structure of the support and the breathable membrane in this embodiment;

[0028] FIG3( b ) is a schematic diagram of the structure of the bracket assembly in this embodiment;

[0029] FIG4( a ) is a schematic diagram of the internal sealing ring and the main structure of this embodiment;

[0030] FIG4( b ) is a schematic diagram of the combined structure of the internal sealing ring and the main body in this embodiment;

[0031] FIG5( a ) is a schematic diagram of the structure of the bracket assembly and the upper cover assembly in this embodiment;

[0032] FIG5( b ) is a schematic diagram of the combined structure of the bracket assembly and the upper cover assembly in this embodiment;

[0033] Figure 6 This is a schematic diagram of the back side of the upper cover in this embodiment;

[0034] FIG. 7( a ) is a schematic diagram of the installation of the upper cover assembly, the bracket assembly, the main body and the connecting parts in this embodiment;

[0035] FIG7( b ) is a cross-sectional view of the upper cover assembly, the bracket assembly, the main body and the connecting member after installation in this embodiment;

[0036] Figure 8 This is a schematic diagram of the overall structure of the new piston-type explosion-proof device used on the inverter in this embodiment;

[0037] FIG9( a ) is a schematic diagram of gas flow of the novel piston-type explosion-proof device used on the inverter when ventilated (closed state) under normal pressure in this embodiment;

[0038] FIG9( b ) is a schematic diagram of gas flow of the novel piston-type explosion-proof device used on the inverter when explosion-proof (open state) is performed under the condition of excessive pressure in this embodiment;

[0039] Fig.10 It is an explosion diagram of a piston-type explosion-proof device in the prior art.

[0040] In the figure: 1 is an upper cover, 2 is a magnetic sheet, 3 is a breathable membrane, 4 is a bracket, 5 is an internal sealing ring, 6 is a main body, 7 is a connecting piece, 8 is a spring, 9 is a screw, 10 is an external sealing ring, and 101 is a protective cover;

[0041] 11 is a top plate, 12 is a first annular ring, 13 is a second annular ring, 14 is an arc-shaped pressing block, and 15 is a first gas flow channel;

[0042] 41 is a support bottom plate, 42 is a third annular ring, and 43 is a second gas flow channel;

[0043] 61 is a connecting hole, 62 is an explosion-proof vent hole;

[0044] 201 is the upper cover of the prior art, 202 is the magnetic attraction sheet of the prior art, and 203 is the pressure ring of the prior art. DETAILED DESCRIPTION

[0045] The utility model is further described below in conjunction with the accompanying drawings.

[0046] A novel piston-type explosion-proof device for an inverter comprises an upper cover assembly, a bracket assembly, an internal sealing ring 5, a main body 6, a connecting piece 7, a spring 8, a screw 9, an external sealing ring 10 and a protective cover 101.

[0047] The upper cover assembly includes an upper cover 1 and a magnetic sheet 2. The upper cover 1 includes a top plate 11, a first annular ring 12, a second annular ring 13 and a plurality of arc-shaped pressing blocks 14. The top surface of the first annular ring 12 is integrally connected to the outer edge of the top plate 11. The second annular ring 13 is coaxially arranged with the first annular ring 12, and the top surface of the second annular ring 13 is also integrally fixedly connected to the lower surface of the top plate 11. The plurality of arc-shaped pressing blocks 14 are evenly arranged at equal distances along the bottom annular surface of the second annular ring 13, and a first gas circulation channel 15 is formed between adjacent arc-shaped pressing blocks 14. The magnetic sheet 2 is placed on the lower surface of the upper cover 1 inside the second annular ring 13.

[0048] The support assembly includes a support 4 and a breathable membrane 3. The support 4 includes a support base plate 41, and a third annular ring 42 protrudes upward along the axial direction on the outer edge of the support base plate 41, and four second gas flow channels 43 are evenly opened in the radial direction on the third annular ring 42. A support bottom center hole is opened in the center of the support base plate 41, and a connecting pipe with external threads is integrally connected to the bottom of the support bottom center hole. The breathable membrane 3 is placed on the upper surface of the support base plate 41 inside the third annular ring 42.

[0049] The upper cover assembly is adsorbed on the top of the bracket assembly through the magnetic attraction sheet 2, and the second annular ring 13 of the upper cover 1 is interference fit and pressed on the inner side of the third annular ring 42 of the bracket 4, and the arc-shaped pressing block 14 at the bottom of the second annular ring 13 presses the breathable membrane 3, so that the first gas circulation channel 15 is connected with the second gas circulation channel 43.

[0050] A connecting hole 61 is provided at the central axis position of the main body 6, and a plurality of explosion-proof vent holes 62 are provided at non-central axis positions along the central axis direction of the main body 6. The connecting pipe at the bottom of the bracket 4 is inserted into the connecting hole 61. Internal threads are provided at both ends of the connecting piece 7, the inner end is inserted into the connecting hole 61 and fixedly connected to the connecting pipe, a spring 8 is sleeved on the outer side of the outer end, and the outer end is connected and fixed with the compression spring 8 by a screw 9. The protective cover 101 is sleeved on the outer end of the connecting piece 7 and the outer side of the screw 9. An internal sealing ring 5 is provided on the top of the main body 6, and an external sealing ring 10 is provided on the bottom of the main body 6.

[0051] This utility model patent improves the existing structure. By improving the structure of the upper cover and the magnetic sheet, the types of parts can be reduced, the difficulty of product manufacturing can be reduced, the manufacturing time can be reduced, and the manufacturing cost can be saved. The assembly method is as follows:

[0052] 1. Stick the magnetic sheet to the upper cover (as shown in Figure 2(a) and Figure 2(b)).

[0053] 2. Stick the breathable membrane into the corresponding slot of the bracket (as shown in Figure 3 (a) and Figure 3 (b)).

[0054] 3. Install the inner sealing ring into the main body slot (as shown in Figure 4 (a) and Figure 4 (b)).

[0055] 4. Press the prefabricated bracket assembly and upper cover assembly together through interference fit (as shown in Figure 5 (a) and Figure 5 (b)). After the upper cover is pressed into place, the ribs on the back (arc-shaped pressing block) press the breathable membrane (as shown in Figure 5 (a) and Figure 5 (b)). Figure 6 ).

[0056] 5. Press the assembled bracket assembly into the main body, pressing the internal sealing ring on the main body; screw the connector into the exposed thread on the back of the bracket to fix the main body and the bracket assembly together (as shown in Figure 7 (a) and Figure 7 (b)).

[0057] 6. Insert the spring into the connector, and then use the screw to press the spring and the connector thread together. Then press the protective cover into the corresponding slot of the main body with an interference fit. Finally, install the external sealing ring into the corresponding slot of the main body, and the assembly is complete. (If Figure 8 ) Function realization process and purpose (as shown in Figure 9(a) and Figure 9(b)):

[0058] 1. When the pressure inside the cavity is less than the explosion value set by the explosion-proof valve, it is a normal working state. In this state, the working principle is the same as that of the traditional waterproof breathable valve: the gas inside and outside the cavity flows freely through the waterproof breathable membrane built into the valve body, and the gas flows from the high pressure side to the low pressure side, that is, when the pressure inside the cavity is greater than the pressure outside the cavity, the gas is discharged to the outside, and when the pressure inside the cavity is less than the pressure outside the cavity, the gas will enter the inner cavity, thereby achieving internal and external pressure balance. Arrow A in Figure 9 shows the direction of gas flow.

[0059] 2. When the pressure inside the cavity is greater than or equal to the explosion value set by the explosion-proof valve, it is in the explosion-proof working state. At this time, the internal pressure pushes open the bracket (as indicated by arrow B in Figure 9), and the gas will pass through the barrier-free channel to the outside (as indicated by arrow C in Figure 9), realizing rapid gas discharge, thereby quickly reducing the pressure inside the cavity and preventing the cavity from exploding. The explosion-proof device plays an explosion-proof role in this state.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A novel piston-type explosion-proof device for an inverter, comprising an upper cover assembly, a bracket assembly, an internal sealing ring (5), a main body (6), a connecting piece (7), a spring (8), a screw (9) and an external sealing ring (10); Features: The upper cover assembly comprises an upper cover (1) and a magnetic attraction sheet (2); The upper cover (1) comprises a top plate (11), a first annular ring (12), a second annular ring (13) and a plurality of arc-shaped pressing blocks (14); the top end surface of the first annular ring (12) is integrally connected to the outer edge of the top plate (11); the second annular ring (13) is coaxially arranged with the first annular ring (12), and the top end surface of the second annular ring (13) is also integrally fixedly connected to the lower surface of the top plate (11); the plurality of arc-shaped pressing blocks (14) are evenly arranged at equal distances along the bottom annular surface of the second annular ring (13), and a first gas flow channel (15) is formed between adjacent arc-shaped pressing blocks (14); The magnetic sheet (2) is placed on the lower surface of the upper cover (1) inside the second annular ring (13); The support assembly comprises a support (4) and a breathable membrane (3); The support (4) comprises a support base plate (41), the outer edge of the support base plate (41) is provided with a third annular ring (42) protruding axially upward, and the third annular ring (42) is provided with a plurality of second gas flow channels (43) in a radial direction; a support bottom center hole is provided in the center of the support base plate (41), and a connecting pipe with an external thread is integrally connected to the bottom of the support bottom center hole; The breathable membrane (3) is placed on the upper surface of the bracket bottom plate (41) inside the third annular ring (42); The upper cover assembly is adsorbed on the top of the bracket assembly through a magnetic attraction sheet (2), and the second annular ring (13) of the upper cover (1) is pressed against the inner side of the third annular ring (42) of the bracket (4) by interference fit, and the arc-shaped pressing block (14) at the bottom of the second annular ring (13) presses the breathable membrane (3), so that the first gas circulation channel (15) is connected with the second gas circulation channel (43).

2. According to claim 1, a novel piston-type explosion-proof device for an inverter is characterized in that: A connection hole (61) is provided at a central axis position of the main body (6), and a plurality of explosion-proof vent holes (62) are provided at non-central axis positions of the main body (6) along the central axis direction; The connecting pipe at the bottom of the bracket (4) is inserted into the connecting hole (61); Both ends of the connecting member (7) are provided with internal threads, the inner end is inserted into the connecting hole (61) and fixedly connected to the connecting pipe, the outer end is sleeved with a spring (8), and the end of the outer end is connected and fixed to the compression spring (8) by a screw (9); An internal sealing ring (5) is arranged at the top of the main body (6), and an external sealing ring (10) is arranged at the bottom of the main body (6).

3. According to claim 2, a novel piston-type explosion-proof device for an inverter is characterized in that: It also comprises a protective sleeve (101); the protective sleeve (101) is sleeved on the outer end of the connecting piece (7) and the outer side of the screw (9).

4. According to claim 1, a novel piston-type explosion-proof device for an inverter is characterized in that: The third annular ring (42) is evenly provided with four second gas flow channels (43) along the radial direction.

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