Photovoltaic array fire propagation barrier

Abstract

The present disclosure relates to a photovoltaic array fire spreading blocking device, comprising: a frame body and a blocking component; the frame body has mounting positions for connecting photovoltaic arrays, and each photovoltaic array is provided with at least one frame body along any edge thereof; wherein when the number of photovoltaic arrays is one or more non-continuous laying and there is a channel between two adjacent photovoltaic arrays, the blocking component comprises a first blocking piece and a third blocking piece; when the number of photovoltaic arrays is multiple and continuous laying, the blocking component comprises a first blocking piece, a second blocking piece, a third blocking piece and a fourth blocking piece; the blocking device can block a plurality of photovoltaic arrays, to a certain extent, slow down the flame spreading speed when a certain photovoltaic array catches fire, and provide time support for personnel to take fire-fighting measures.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic array fire prevention technology, and in particular relates to a photovoltaic array fire spread prevention device. Background Technology

[0002] With the rapid development and widespread promotion of the photovoltaic industry, the installed capacity has been increasing year by year. Inverters, combiner boxes, high-current components and application scenarios are becoming more and more complex, resulting in an increase in fire hazards.

[0003] For example, adding photovoltaic power generation to a building increases potential ignition sources, such as electric arcs at the cable connections of multiple photovoltaic modules and spontaneous combustion of hot spots on photovoltaic modules. At the same time, due to the material characteristics of photovoltaic modules themselves, such as the ethylene-vinyl acetate copolymer film (EVA film) and backsheet of single-glass photovoltaic modules, which are flammable materials, when a photovoltaic array installed on a building is damaged and catches fire, it can easily ignite other photovoltaic arrays around it, potentially causing huge property damage. Summary of the Invention

[0004] The purpose of this disclosure is to provide a fire spread prevention device for photovoltaic arrays, which can have a flame-retardant effect on photovoltaic arrays, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, this disclosure provides a photovoltaic array fire spread prevention device, comprising: a frame and a blocking component; the frame has mounting positions for connecting the photovoltaic array and each photovoltaic array has at least one frame on any side edge;

[0006] When the number of photovoltaic arrays is one or more non-continuously laid out and there is a channel between two adjacent photovoltaic arrays, the barrier component includes a first barrier and a third barrier. The first barrier has a storage part for accommodating the frame and is located at the edge of the photovoltaic array. A third barrier is provided on the side of the first barrier away from the storage part. The third barrier has a first clamping groove inside for inserting a first barrier plate, and the first barrier plate is provided in the first clamping groove.

[0007] When there are multiple photovoltaic arrays installed continuously, the barrier components include a first barrier, a second barrier, a third barrier, and a fourth barrier. The first barrier and the second barrier each have a storage portion for housing the frame. The first barrier is located at the edge of the photovoltaic array, and the second barrier is located between two adjacent photovoltaic arrays. Each side of the second barrier has an independent storage portion. A third barrier is located on the side of the first barrier facing away from the storage portion. The third barrier has a first groove for inserting a first barrier plate, and the first barrier plate is located within the first groove. A fourth barrier is located on the side of the second barrier facing away from the storage portion. Both the fourth barrier and the second barrier have a second groove for inserting a second barrier plate, and the second barrier plate is located within the second groove.

[0008] In some embodiments, the storage portion includes a support plate and a stop plate disposed opposite to each other;

[0009] The upper surface of the support plate contacts the lower surface of the frame, and the stop plate is used to stop the frame.

[0010] In some embodiments, the third barrier is fixed to the first barrier or connected to the first barrier via a hinge.

[0011] In some embodiments, the third barrier further includes a connector for securing the first barrier plate within the first clamping groove.

[0012] In some embodiments, the fourth barrier is fixedly connected to the second barrier, and the second clamping groove of the fourth barrier is in communication with the interior of the second clamping groove of the second barrier.

[0013] The second barrier plate is connected to the second clamping groove via a connector.

[0014] In some embodiments, the fourth barrier is connected to the second barrier via a hinge;

[0015] The second barrier is provided with a sealing plate for blocking the second barrier plate, the sealing plate being fixed to the opening of the second clamping groove of the second barrier;

[0016] The fourth barrier is provided with a connector for connecting the second barrier plate.

[0017] In some embodiments, the connector includes a rail and a base;

[0018] The outer wall surface of the third barrier and / or the outer wall surface of the fourth barrier are both fixed with the insertion rail;

[0019] The base includes a first plate and a connector, the connector being fixedly connected to the first plate, and the connector having a slot that matches the outline of the insertion rail.

[0020] In some embodiments, both the first barrier plate and the second barrier plate are fire-resistant boards, and the thickness of the fire-resistant board is: δ=0.3λD / (1+0.42λD);

[0021] Where δ is the thickness of the fire-resistant board and λ is the thermal conductivity of the fire-resistant board;

[0022] In the calculation of the thickness of the first barrier plate, D is the distance between the first barrier and the first barrier or the second barrier that is disposed opposite to it.

[0023] In the calculation of the thickness of the second barrier plate, D is the larger of the distances between the second barrier and the first or second barrier that are arranged opposite to each other on both sides.

[0024] In some embodiments, the third barrier and the fourth barrier each have a gap between their ends facing away from the photovoltaic array and the roof.

[0025] The height of the gap is h, and h = pS / (86400Lv); when the calculated h value is ≥10mm, the height of the gap is selected as a fixed value of 10mm;

[0026] Where v is the water flow velocity on the roof surface, p is the maximum local 24-hour rainfall since records began, and S is the area of ​​the photovoltaic array.

[0027] When the photovoltaic array is located on a horizontal roof and is not laid continuously, L is the perimeter of the photovoltaic array;

[0028] When the photovoltaic array is located on a sloping roof and is not laid out continuously, L is the side length of the photovoltaic array on the lowest side of the horizontal position.

[0029] When the photovoltaic array is located on a horizontal roof and is continuously installed, L is the sum of the side lengths of the photovoltaic array on the side without adjacent photovoltaic arrays. When calculating the value of h of the fourth barrier between two adjacent photovoltaic arrays, the two adjacent photovoltaic arrays should be calculated separately, and the larger value is the value of h of the fourth barrier.

[0030] When the photovoltaic array is located on a sloping roof and is continuously installed, L is the side length of the photovoltaic array on the lowest side of the horizontal position. When calculating the value of h of the fourth barrier between two adjacent photovoltaic arrays, the two adjacent photovoltaic arrays should be calculated separately, and the larger value is the value of h of the fourth barrier.

[0031] The present invention has the following advantages and beneficial effects:

[0032] (1) In this disclosure, the photovoltaic array can be protected by the barrier components, which can achieve the effect of flame retardancy and extend the time for the flame to ignite the adjacent photovoltaic array when a certain photovoltaic array catches fire, thus providing valuable time for personnel to take fire-fighting measures and avoiding greater property damage to a certain extent. When the number of photovoltaic arrays is one or more and they are not laid out continuously and there is a channel between two adjacent photovoltaic arrays, the first barrier component and the third barrier component can be used to block the photovoltaic arrays. When the number of photovoltaic arrays is multiple and they are laid out continuously, the first barrier component and the third barrier component, the second barrier component and the fourth barrier component can be used to block the photovoltaic arrays.

[0033] (2) In this disclosure, when the photovoltaic array is installed on the roof, the roof is usually covered with a waterproof layer for waterproofing purposes. The waterproof layer is mostly made of asphalt (asphalt waterproof coating itself is flammable). When a fire occurs in a photovoltaic array, there is a possibility that the waterproof layer may be ignited and then the adjacent photovoltaic array may be ignited. Therefore, in this disclosure, a third barrier is provided at the end of the first barrier that is away from the photovoltaic array, and a fourth barrier is provided at the end of the second barrier that is away from the photovoltaic array. The second barrier and the fourth barrier can effectively prevent the waterproof layer from igniting the photovoltaic array.

[0034] (3) In this disclosure, in order to reduce wind load, the first barrier and the third barrier can be connected by a hinge, and the second barrier and the fourth barrier can also be connected by a hinge. That is, when there is wind in the external environment, the third barrier and the fourth barrier will swing with the wind under the action of the hinge, effectively reducing the threat of wind load to the barrier components and photovoltaic array.

[0035] (4) In this disclosure, the barrier device will not interfere with the drainage function of the photovoltaic array during normal operation. That is, the third barrier and the fourth barrier have a gap between the end away from the photovoltaic array and the roof. The gap can be used for drainage and the specific value of the gap is calculated so that the third barrier and the fourth barrier can achieve the flame retardant effect while meeting the drainage needs.

[0036] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0038] Figure 1 This is a side cross-sectional schematic diagram of the second and fourth barrier members provided in an exemplary embodiment of this disclosure, wherein the second and fourth barrier members are connected by a hinge member;

[0039] Figure 2 This is a side cross-sectional view of the second and fourth barrier members without the second barrier plate installed, provided in an exemplary embodiment of this disclosure.

[0040] Figure 3 This is a side cross-sectional view of the first barrier and the third barrier provided in the exemplary embodiments of this disclosure when they are fixed together;

[0041] Figure 4 This is a side cross-sectional view of the first barrier and the third barrier provided in an exemplary embodiment of this disclosure without the first barrier plate installed.

[0042] Figure 5 This is a side cross-sectional view of the second and fourth barrier members provided in an exemplary embodiment of this disclosure, wherein the second and fourth barrier members are fixedly connected.

[0043] Figure 6 This is a side cross-sectional schematic diagram of another structure of the second and fourth barrier members provided in an exemplary embodiment of this disclosure; wherein the second and fourth barrier members are connected by a hinge.

[0044] Figure 7 This is a side cross-sectional schematic diagram of the first barrier and the third barrier provided in an exemplary embodiment of this disclosure, wherein the first barrier and the third barrier are connected by a hinge.

[0045] Figure 8 This is a schematic diagram of the structure of a discontinuously laid photovoltaic array provided in an exemplary embodiment of this disclosure;

[0046] Figure 9 This is a front view structural diagram of a continuously installed photovoltaic array provided in an exemplary embodiment of this disclosure, wherein only two photovoltaic arrays are shown as an example.

[0047] Figure 10This is a top view of a non-continuously installed photovoltaic array (one of one or more) provided in an exemplary embodiment of this disclosure.

[0048] Figure 11 This is a top view of a continuously installed photovoltaic array provided in an exemplary embodiment of this disclosure, wherein only three photovoltaic arrays are shown as an example.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1-Frame; 101-Mounting position; 201-First barrier; 202-Second barrier; 2021-Sealing plate; 3-Storage section; 301-Support plate; 302-Stop plate; 4-Photovoltaic array; 5-Third barrier; 501-First clamping groove; 6-Hinge; 7-Connector; 701-Insertion rail; 702-Base; 7021-First plate; 7022-Insertion piece; 8-Fourth barrier; 801-Second clamping groove; 901-First barrier plate; 902-Second barrier plate. Detailed Implementation

[0051] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0052] In this disclosure, unless otherwise stated, directional terms such as "up" and "down" generally refer to the relative "up" and "down" in the direction of gravity when the corresponding components are in use. Figure 1 The upper and lower parts of the drawing plane. "Inner" and "outer" refer to the inner and outer parts relative to the outline of the component or structure itself. Furthermore, it should be noted that the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance. When the following description refers to the drawings, and in this document, "a plurality of" means at least two, unless otherwise explicitly specified. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0053] In related technologies, a photovoltaic (PV) array is a DC power generation unit composed of several PV modules or panels mechanically and electrically assembled in a specific manner and having a fixed supporting structure. Because PV modules, especially the ethylene-vinyl acetate copolymer (EVA) film and backsheet of single-glass PV modules, are flammable materials, a fire in one PV array can easily spread to adjacent arrays. Furthermore, if the PV array is located on a building, the combined risk of a fire in the PV array and the building itself could result in significant personal injury and property damage.

[0054] Based on this, a photovoltaic array fire spread prevention device is provided in the specific embodiments provided herein, with reference to... Figures 1 to 7 As shown, the photovoltaic array fire spread prevention device includes: a frame 1 and a blocking component; the frame 1 has a mounting position 101 for connecting the photovoltaic array 4 and each of the photovoltaic array 4 has at least one frame 1 on any side edge;

[0055] When the number of photovoltaic arrays 4 is one or more non-continuously laid out and there is a channel between two adjacent photovoltaic arrays 4, the barrier component includes a first barrier 201 and a third barrier 5. The first barrier 201 has a storage part 3 for storing the frame 1 and is located at the edge of the photovoltaic array 4. The third barrier 5 is provided on the side of the first barrier 201 away from the storage part 3. The third barrier 5 has a first clamping groove 501 inside for inserting the first barrier plate 901 and the first barrier plate 901 is provided in the first clamping groove 501.

[0056] When there are multiple photovoltaic arrays 4 installed continuously, the barrier components include a first barrier 201, a second barrier 202, a third barrier 5, and a fourth barrier 8. Both the first barrier 201 and the second barrier 202 have a storage portion 3 for housing the frame 1. The first barrier 201 is located at the edge of the photovoltaic array, and the second barrier 202 is located between two adjacent photovoltaic arrays 4. Each side of the second barrier 202 has an independent storage portion 3. The first barrier 201 has a third barrier 5 on the side opposite to the storage part 3; the third barrier 5 has a first clamping groove 501 for inserting the first barrier plate 901 inside, and the first barrier plate 901 is disposed in the first clamping groove 501; the second barrier 202 has a fourth barrier 8 on the side opposite to the storage part 3, and both the fourth barrier 8 and the second barrier 202 have a second clamping groove 801 for inserting the second barrier plate 902 inside the second clamping groove 801.

[0057] Through the above technical solution, barrier components can be installed on the outside of the frame 1 used to install the photovoltaic array 4. When there are one or more photovoltaic arrays 4 that are not laid continuously and there is a passage between photovoltaic arrays 4, the first barrier 201 and the third barrier 5 at the edge of the photovoltaic array 4 can provide barrier. When there are multiple photovoltaic arrays 4 that are laid continuously, the first barrier 201 and the third barrier 5, the second barrier 202 and the fourth barrier 8 can provide barrier to the photovoltaic array 4, effectively slowing down the time it takes for the flames of the burning photovoltaic array 4 to spread to the adjacent photovoltaic arrays 4, providing valuable time for personnel to take fire-fighting measures, and to a certain extent avoiding greater property damage.

[0058] In this disclosure, the first barrier 201 and the third barrier 5 are disposed at the edge of the photovoltaic array 4. When there are one or more photovoltaic arrays 4 and they are not laid continuously (there is a channel between the photovoltaic arrays), the first barrier 201 and the third barrier 5 around the photovoltaic array 4 provide obstruction. When there are multiple photovoltaic arrays 4 and they are laid continuously, the first barrier 201 and the third barrier 5 are disposed at the edge of the multiple photovoltaic arrays 4 laid continuously. The second barrier 202 and the fourth barrier 8 are disposed between any adjacent photovoltaic arrays 4. All photovoltaic arrays in the multiple photovoltaic arrays 4 laid continuously are obstructed by the first barrier 201 and the third barrier 5, the second barrier 202 and the fourth barrier 8.

[0059] In one specific embodiment, the frame 1 is made of steel and has mounting positions 101 for connecting photovoltaic panels 4. The frame 1 is an existing structure and will not be described in detail in this disclosure.

[0060] In one specific embodiment, the first barrier, the second barrier, the third barrier, and the fourth barrier are made of metal, but excluding aluminum. In another specific embodiment, they are made of steel.

[0061] In some implementations, reference Figure 1 As shown, the storage section 3 includes a support plate 301 and a stop plate 302 arranged opposite to each other. When part of the frame 1 is installed into the storage section 3, the upper surface of the support plate 301 contacts the lower surface of the frame 1, and the support plate 301 provides support for the frame 1. At the same time, in order to prevent the frame 1 from detaching from the storage section 3 to a certain extent, a stop plate 302 can be provided above the support plate 301 to stop the frame 1.

[0062] In some embodiments, taking the installation of photovoltaic arrays on the roof of a building as an example, when multiple photovoltaic arrays are installed on a horizontal roof and are laid continuously, considering that the roof surface is mostly covered with a waterproof layer (such as asphalt) for waterproofing, if one of the photovoltaic arrays 4 installed on the horizontal roof catches fire, the waterproof layer may be ignited due to the excessively high temperature. This is addressed by using a third barrier 5 installed below the first barrier 201 (for horizontal roofs, see reference...). Figure 3 As shown, the first barrier 201 and the third barrier 5 can be fixedly connected, and the fourth barrier 8 is installed below the second barrier 202 (for horizontal roofs, see reference). Figure 5 or Figure 6As shown, the second barrier 202 and the fourth barrier 8 can be fixedly connected to block each other. The third barrier 5 and the fourth barrier 8 extend toward the waterproof layer. When a photovoltaic array 4 catches fire, even if it ignites part of the waterproof layer below the burning photovoltaic array 4, the flame spread speed of the burning waterproof layer is slowed down by the blocking effect of the third barrier 5 and the fourth barrier 8. To a certain extent, this prevents the flame of the burning waterproof layer from affecting the adjacent photovoltaic array 4 and the adjacent waterproof layer.

[0063] In some embodiments, taking the installation of photovoltaic arrays on the roof of a building as an example, when multiple photovoltaic arrays are installed on a sloping roof and are laid continuously, the first barrier 201 and the third barrier 5 are in an inclined state (the extension direction of the first barrier 201 and the third barrier 5 toward the roof is perpendicular to the upper surface of the roof), and the second barrier 202 and the fourth barrier 8 are also in an inclined state (the extension direction of the second barrier 202 and the fourth barrier 8 toward the roof is perpendicular to the upper surface of the roof). For stress considerations (if the first barrier 201 and the third barrier 5 are fixedly connected, the third barrier 5 will be affected by gravity, which may cause damage to the overall structure of the first barrier 201 and the third barrier 5; the same applies to the second barrier 202 and the fourth barrier 8), therefore, when the photovoltaic arrays are installed on a sloping roof, the first barrier 201 and the third barrier 5 can be connected by a hinge 6 (see reference). Figure 7 As shown), the second barrier 202 and the fourth barrier 8 can be connected by a hinge 6 (see reference). Figure 1 or Figure 6 As shown, the function of the hinge 6 is to allow the third barrier 5 or the fourth barrier 8 to hang down naturally in the vertical direction, so that the force between the first barrier 201 and the third barrier 5 is more uniform, and similarly, the force between the second barrier 202 and the fourth barrier 8 is more uniform.

[0064] In this disclosure, regarding the description of the hinge 6, the use of the hinge 6 can effectively reduce the impact of wind load on the barrier device. In this disclosure, for the installation of a photovoltaic array on a horizontal roof, the first barrier 201 and the third barrier 5 can also be connected by the hinge 6, and the second barrier 202 and the fourth barrier 8 can also be connected by the hinge 6. Specifically, whether or not to use the hinge 6 depends on the actual situation during installation. That is, when the roof is a horizontal roof or a small-angle roof (<3°), and the site for installing the photovoltaic array is windless or has little wind, the hinge 6 is not required. When the roof is a roof with a certain slope (≥3°) or the site for installing the photovoltaic array has a large wind volume, the hinge 6 is required.

[0065] Specifically, in this application, the hinge 6 includes a hinge cylindrical pivot and hinges located on both sides of the hinge cylindrical pivot. For ease of understanding, taking the connection between the fourth barrier 8 and the second barrier 202 as an example, refer to... Figure 1 As shown, the hinge 6 is positioned between the fourth barrier 8 and the second barrier 202. The hinges on both sides are connected to the fourth barrier 8 and the second barrier 202 respectively. The hinges can be connected to the fourth barrier 8 and the second barrier 202 by screws, thereby enabling the fourth barrier 8 to rotate 90° in both directions along the vertical direction to solve the wind load safety problem that may occur due to excessive wind resistance in windy weather.

[0066] In this disclosure, the first barrier plate 901 and the second barrier plate 902 are made of refractory materials (such as asbestos, corundum bricks, etc.), which can improve the barrier effect against flames, heat radiation and heat convection of the photovoltaic array 4 or the waterproof layer.

[0067] For the installation instructions of the first barrier plate 901 and the second barrier plate 902, please refer to... Figures 1 to 4 As shown, the third barrier 5 has a first clamping groove 501 for inserting the first barrier plate 901 inside, and the first barrier plate 901 is fixed in the first clamping groove 501 by the connector 7.

[0068] When the fourth barrier 8 is fixedly connected to the second barrier 202 (horizontal roof), both the fourth barrier 8 and the second barrier 202 have a second clamping groove 801 for inserting the second barrier plate 902, and the second clamping groove 801 of the fourth barrier 8 is in communication with the second clamping groove 801 of the second barrier 202. Similarly, the second barrier plate 902 is fixed in the second clamping groove 801 by the connector 7.

[0069] When the fourth barrier 8 and the second barrier 202 are connected by a hinge shaft (on a sloping roof), the second clamping groove 801 of the fourth barrier 8 and the second clamping groove 801 of the second barrier 202 are not internally connected. The opening of the second clamping groove 801 of the second barrier 202 is provided with a sealing plate 2021 to stop the second barrier plate 902. The second barrier plate 902, which is located in the second clamping groove 801 of the fourth barrier 8, is also connected by a connector 7.

[0070] For a description of connector 7, please refer to [link / reference]. Figures 3 to 7 As shown, the connector 7 can be fixed to the first barrier plate 901 in the third barrier plate 5 and the second barrier plate 902 in the second barrier plate 202 and the fourth barrier plate 8 respectively by means of bolts and washers.

[0071] Connector 7 can also be, for example, Figure 1The structure of the connector 7 shown is as follows: the connector 7 includes two insert rails 701 and a base 702. The two insert rails 701 are respectively fixed to the outer walls of the two sides of the fourth barrier member 8. The base 702 includes a first plate 7021 and a connector 7022. The connector 7022 is fixed to the first plate 7021. The first plate 7021 is located below the opening of the second clamping groove 801 of the fourth barrier member 8. The connector 7022 has a slot that matches the outer contour of the insert rail 701. In this disclosure, the specific shapes of the slots and the insert rails 701 are not described in detail, but can be as follows: Figure 1 The L-shape shown can also be a C-shaped slot (not shown), and the cross-sectional profile of the insertion rail 701 can be a straight line.

[0072] In this disclosure, the thickness design method for the barrier plate 9 includes the following:

[0073] The first barrier plate (901) and the second barrier plate (902) are constructed as fire-resistant boards, and the thickness of the fire-resistant board is: δ=0.3λD / (1+0.42λD);

[0074] Where δ is the thickness of the fire-resistant board and λ is the thermal conductivity of the fire-resistant board;

[0075] In the thickness calculation of the first barrier plate 901, D is the distance between the first barrier 201 and the first barrier 201 or the second barrier 202 disposed opposite to it.

[0076] In the thickness calculation of the second barrier plate 902, D is the larger of the distances between the second barrier 202 and the first barrier 201 or the second barrier 202 that are arranged opposite to each other on both sides.

[0077] like Figure 8 As shown, when the photovoltaic array is laid out in one or more discontinuous ways, D is the distance between the first barrier 201 and the first barrier 201 that is disposed opposite to it.

[0078] For example, if the material of the fire-resistant board is asbestos and the thermal conductivity is 0.1 W / (m·K), and D is 10 m, then δ=(0.3×0.1×10) / (1+0.42×0.1×10) calculates that the thickness of the first barrier board is approximately 0.211 m.

[0079] For ease of understanding, when the photovoltaic array consists of two consecutive installations, please refer to... Figure 9As shown, in the thickness calculation of the second barrier plate 902, D is the larger of D1 and D2, where D1 is the distance between the second barrier 202 and the first barrier 201 which is arranged opposite to it on the adjacent side, and D2 is the distance between the second barrier 202 and the first barrier 201 which is arranged opposite to it on the other side.

[0080] The fire-resistant plate thickness design method adopted in this invention can minimize the weight of the device and reduce the load burden on the photovoltaic array by blocking the flame and heat radiation while meeting the requirements.

[0081] In some embodiments of this disclosure, considering the drainage performance of the roof, the ends of the third barrier 5 and the fourth barrier 8 facing away from the photovoltaic array have gaps between them and the roof.

[0082] The height of the gap is h, and h = pS / (86400Lv); when the calculated h value is ≥10mm, the height of the gap is selected as a fixed value of 10mm;

[0083] v is the water flow velocity on the roof surface, p is the maximum local 24-hour rainfall since records began, and S is the area of ​​the photovoltaic array.

[0084] Where h is in meters (m), v is in mm / s, p is in mm, and S is in meters (m). 2 The unit of L is meters (m). Understandably, under the corresponding unit, the value can be directly substituted into the formula h = pS / (86400Lv) to calculate the value of h.

[0085] In this disclosure, since the fourth barrier 8 is disposed between two adjacent photovoltaic arrays, the fourth barrier 8 is not involved in discontinuous photovoltaic arrays. That is, in discontinuous photovoltaic arrays, only the numerical calculation of h for the third barrier 5 is involved. When the photovoltaic array 4 is located on a horizontal roof and is discontinuously installed, L is the perimeter of the photovoltaic array 4. For ease of understanding, please refer to... Figure 10 As shown, where L is L1+L2+L3+L4, then by substituting L1+L2+L3+L4 and S4 into h=pS / (86400Lv), the value of h of the third barrier 5 can be calculated.

[0086] When the photovoltaic array 4 is located on a sloping roof and is not laid continuously, L is the side length of the photovoltaic array 4 on the lowest horizontal side (the side of the photovoltaic array 4 closest to the roof). (As a non-limiting example, the maximum 24-hour rainfall in a certain area is 1000mm, and the area of ​​the photovoltaic array is 100m².) 2 The side length of the photovoltaic array on the lowest horizontal side is 10m; the water flow velocity on the roof surface is approximately 25mm / s, then p = 1000 (mm), S = 100 (m). 2Given L = 10 m and v = 25 mm / s, then h = (1000 × 100) / (86400 × 10 × 25) = 0.00463 m; that is, 4.63 mm.

[0087] In this disclosure, since the fourth barrier 8 is set between two adjacent photovoltaic arrays, the continuously installed photovoltaic array 4 has a third barrier 5 and a fourth barrier 8. That is, it is necessary to calculate the h of the third barrier 5 and the h of the fourth barrier 8. When the photovoltaic array 4 is located on a horizontal roof and is continuously installed, L is the sum of the side lengths of the photovoltaic array 4 on the side without adjacent photovoltaic arrays 4. When calculating the value of h of the fourth barrier 8 located between two adjacent photovoltaic arrays 4, the two adjacent photovoltaic arrays 4 should be calculated separately, and the larger value is the value of h of the fourth barrier 8.

[0088] For easier understanding, please refer to Figure 11 As shown, in Figure 11 The example shows a top view of three photovoltaic arrays 4 continuously installed on a horizontal roof. Taking the continuous installation of three photovoltaic arrays 4 as an example, when calculating the h of the third barrier 5, it is necessary to calculate the h of the third barrier 5 in each of the three photovoltaic arrays 4 separately, so as to obtain the value of h of the third barrier 5 in each photovoltaic array 4. The L in the three photovoltaic arrays 4 are L9+L5+L10, L6+L11, L7+L8+L12 respectively, and the S in the three photovoltaic arrays 4 are S1, S2, S3 respectively. Then, the corresponding data (taking S1 as an example, the L corresponding to S1 is L9+L5+L10) are substituted into h = pS / (86400Lv) and calculated to obtain the value of h of the third barrier 5 in each photovoltaic array 4.

[0089] Since the fourth barrier 8 is located between two adjacent photovoltaic arrays 4, in order to ensure better safety of the fourth barrier 8, the h value of the two photovoltaic arrays 4 needs to be calculated separately and the values ​​compared. That is, taking the fourth barrier 8 located between S1 and S2 as an example, S1 and its corresponding L (L corresponding to S1 is L9+L5+L10) are substituted into h = pS / (86400Lv) and calculated. S2 and its corresponding L (L corresponding to S2 is L11+L6) are substituted into h = pS / (86400Lv) and calculated. Then the two h values ​​are compared, and the larger value is the h value of the fourth barrier 8.

[0090] When the photovoltaic array 4 is located on a sloping roof and is continuously installed (because the photovoltaic array 4 is continuously installed, it is necessary to calculate h of the third barrier 5 and the fourth barrier 8), L is the side length of the photovoltaic array 4 on the lowest horizontal side (the side of the photovoltaic array 4 closest to the roof). For ease of understanding, let L be the side length of the photovoltaic array 4. Figure 11 The following describes the three continuously laid photovoltaic panels shown. When calculating the value of h for the third barrier 5, L5, L6, and L7 in the three photovoltaic arrays 4 can be set as the side length of the lowest side. Taking the photovoltaic array 4 to which L5 belongs as an example, L5 corresponds to S1. Substitute L5 and S1 into h = pS / (86400Lv) and calculate to obtain the value of h for the third barrier 5 in the photovoltaic array 4 to which L5 belongs.

[0091] When calculating the value of h for the fourth barrier element 8 located between two adjacent photovoltaic arrays 4, the calculation should be performed separately for each of the two adjacent photovoltaic arrays 4. The larger value is taken as the value of h for the fourth barrier element 8. For ease of understanding, let's consider the value of h for the fourth barrier element 8. Figure 11 The following example illustrates three continuously laid photovoltaic panels. Taking the calculation of the h value of the fourth barrier 8 located between the photovoltaic array 4 to which S1 belongs and the photovoltaic array 4 to which S2 belongs as an example, it is necessary to substitute L5 and S1, L6 and S2 into h = pS / (86400Lv) and perform the calculation. The two h values ​​obtained are compared, and the larger value is the h value of the fourth barrier 8.

[0092] The ground gap design method for the fire spread prevention device of the photovoltaic array adopted in this invention can extinguish the flames as they pass through the gap when a fire occurs between the photovoltaic array and the combustible materials on the roof of the building. This safe gap reduces the possibility of the flames spreading to the other side through the prevention device, thereby preventing or slowing the fire spread process, helping to limit the fire scale, reduce the difficulty of firefighting, and minimize fire losses. The prevention device can also ensure that in daily working environments, the stress impact of wind load on the photovoltaic array under strong winds is reduced, and the impact of the prevention device on drainage capacity under rain and snow is minimized.

[0093] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A photovoltaic array fire spread prevention device, characterized in that, include: The frame (1) and the barrier assembly; the frame (1) has a mounting position (101) for connecting the photovoltaic array (4) and each of the photovoltaic arrays (4) has at least one of the frame (1) on any side edge. When the number of photovoltaic arrays (4) is one or more non-continuously laid and there is a channel between two adjacent photovoltaic arrays (4), the barrier component includes a first barrier (201) and a third barrier (5). The first barrier (201) has a storage part (3) for storing the frame (1). The first barrier (201) is located at the edge of the photovoltaic array. The third barrier (5) is provided on the side of the first barrier (201) away from the storage part (3). The third barrier (5) is provided with a first clamping groove (501) for inserting the first barrier plate (901). The first clamping groove (501) is provided with the first barrier plate (901). When the number of photovoltaic arrays (4) is multiple and they are laid out continuously, the barrier components include a first barrier (201), a second barrier (202), a third barrier (5), and a fourth barrier (8). The first barrier (201) and the second barrier (202) each have a storage portion (3) for accommodating the frame (1). The first barrier (201) is located at the edge of the photovoltaic array, and the second barrier (202) is located between two adjacent photovoltaic arrays (4). The second barrier (202) has independent storage portions (3) on both sides. A third barrier (5) is provided on the side of the barrier (201) away from the storage part (3); the third barrier (5) is provided with a first clamping groove (501) for inserting the first barrier plate (901), and the first barrier plate (901) is provided in the first clamping groove (501); a fourth barrier (8) is provided on the side of the second barrier (202) away from the storage part (3), and both the fourth barrier (8) and the second barrier (202) have a second clamping groove (801) for inserting the second barrier plate (902), and the second barrier plate (902) is provided in the second clamping groove (801); The third barrier (5) and the fourth barrier (8) have gaps between their ends facing away from the photovoltaic array (4) and the roof. The height of the gap is h, and h = pS / (86400Lv); when the calculated h value is ≥10mm, the height of the gap is selected as a fixed value of 10mm; Where v is the water flow velocity on the roof surface, p is the local maximum 24-hour rainfall since records began, and S is the area of ​​the photovoltaic array (4). When the photovoltaic array (4) is located on a horizontal roof and is not laid continuously, L is the perimeter of the photovoltaic array (4); When the photovoltaic array (4) is located on a sloping roof and is not laid out continuously, L is the side length of the photovoltaic array (4) on the lowest side of the horizontal position; When the photovoltaic array (4) is located on a horizontal roof and is continuously installed, L is the sum of the side lengths of the photovoltaic array (4) on the side without adjacent photovoltaic arrays (4). When calculating the value of h of the fourth barrier (8) located between two adjacent photovoltaic arrays (4), the two adjacent photovoltaic arrays (4) should be calculated separately, and the larger value is the value of h of the fourth barrier (8). When the photovoltaic array (4) is located on a sloping roof and is continuously installed, L is the side length of the photovoltaic array (4) on the lowest side of the horizontal position. When calculating the value of h of the fourth barrier (8) located between two adjacent photovoltaic arrays (4), the two adjacent photovoltaic arrays (4) should be calculated separately, and the larger value is the value of h of the fourth barrier (8).

2. The photovoltaic array fire spread prevention device according to claim 1, characterized in that, The storage section (3) includes a support plate (301) and a stop plate (302) disposed opposite to each other. The upper surface of the support plate (301) is in contact with the lower surface of the frame (1), and the stop plate (302) is used to stop the frame (1).

3. The photovoltaic array fire spread prevention device according to claim 1, characterized in that, The third barrier (5) is fixed to the first barrier (201) or connected to the first barrier (201) via a hinge (6).

4. The photovoltaic array fire spread prevention device according to claim 3, characterized in that, The third barrier (5) further includes a connector (7) for fixing the first barrier plate (901) in the first clamping groove (501).

5. The photovoltaic array fire spread prevention device according to claim 4, characterized in that, The fourth barrier (8) is fixedly connected to the second barrier (202), and the second clamping groove (801) of the fourth barrier (8) is in communication with the interior of the second clamping groove (801) of the second barrier (202); The second barrier plate (902) is connected to the second clamping groove (801) via a connector (7).

6. The photovoltaic array fire spread prevention device according to claim 4, characterized in that, The fourth barrier (8) is connected to the second barrier (202) via a hinge (6). The second barrier (202) is provided with a sealing plate (2021) for blocking the second barrier plate (902), the sealing plate (2021) being fixed to the opening of the second clamping groove (801) of the second barrier (202); The fourth barrier (8) is provided with the connector (7) for connecting the second barrier plate (902).

7. The photovoltaic array fire spread prevention device according to claim 6, characterized in that, The connector (7) includes a rail (701) and a base (702); The outer wall surface of the third barrier (5) and / or the outer wall surface of the fourth barrier (8) are both fixed with the insertion rail (701). The base (702) includes a first plate (7021) and a connector (7022), the connector (7022) being fixedly connected to the first plate (7021), and the connector (7022) having a slot that matches the outer contour of the rail (701).

8. The photovoltaic array fire spread prevention device according to claim 5 or 6, characterized in that, The first barrier plate (901) and the second barrier plate (902) are both fire-resistant boards, and the thickness of the fire-resistant board is: δ=0.3λD / (1+0.42λD); in, The thickness of the fire-resistant board, The thermal conductivity of the fire-resistant board; In the thickness calculation of the first barrier plate (901), D is the distance between the first barrier (201) and the first barrier (201) disposed opposite to it, or the distance between the first barrier (201) and the second barrier (202); In the thickness calculation of the second barrier plate (902), D is the larger of the distances between the second barrier (202) and the first barrier (201) or the second barrier (202) which are arranged opposite to each other on the adjacent sides.

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