Photovoltaic module wiring device for photovoltaic power generation

Abstract

The utility model relates to the technical field of photovoltaic assembly wiring devices, in particular to a photovoltaic assembly wiring device for photovoltaic power generation, which comprises a male head, a female head, a first inner core and a second inner core, the male head and the female head can be mutually plugged, the first inner core is arranged inside the male head, the second inner core is arranged inside the female head, and one end of the first inner core and one end of the second inner core are used for being connected with a wire. A plurality of elastic reeds are arranged at the end, opposite to the connecting wire, of the first inner core, the elastic reeds are evenly arranged in the circumferential direction at intervals along the axis of the first inner core, and when the male head is connected with the female head in an inserted mode, the outer wall of the end of the second inner core in the female head abuts against the inner side walls of the elastic reeds. According to the MC4 connector, the two inner cores of the MC4 connector are transformed, certain clamping force can be kept after the two inner cores are connected in an inserted mode, the situation of poor contact is avoided, meanwhile, when the temperature of the inner cores rises, the two inner cores can be automatically switched to be in an open-circuit state, and the working efficiency is improved. And fire disasters are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic component wiring devices, in particular to a photovoltaic component wiring device for photovoltaic power generation. Background Art

[0002] The existing photovoltaic power generation device is a photoelectric conversion device formed by connecting the positive and negative poles of multiple solar panels in series. The positive and negative poles are connected by MC4 connectors to achieve quick plugging and unplugging. The existing photovoltaic power generation device also has safety hazards. For example, the MC4 connector mentioned above may have poor contact, false connection or critical contact, resulting in high temperature burning inside the MC4 connector. The main reason for the poor contact is that the contact is unstable when the inner cores inside the MC4 connector transmit power. The two inner cores of the existing MC4 connector are both tubular. After being plugged into each other, there is a large error during production or they are affected by external forces, which is very likely to cause poor contact. Based on this situation, it is necessary to design a photovoltaic module wiring device for photovoltaic power generation to solve the above problems. Utility Model Content

[0003] The utility model provides a photovoltaic module wiring device for photovoltaic power generation, which transforms the two inner cores of the MC4 connector so that after the two are plugged into each other, they can maintain a certain clamping force to avoid poor contact. At the same time, when the temperature at the inner core rises, the two inner cores can automatically switch to a circuit-breaking state to avoid fire.

[0004] The technical problem solved by the present invention is achieved by the following technical solutions:

[0005] A photovoltaic module wiring device for photovoltaic power generation, comprising a male connector and a female connector that can be plugged into each other, a first inner core placed inside the male connector, and a second inner core placed inside the female connector, one end of the first inner core and the second inner core being used for connection to a wire, a plurality of elastic springs being provided at the end of the first inner core opposite to the connecting wire, the plurality of elastic springs being uniformly spaced circumferentially arranged along the axis of the first inner core, and when the male connector and the female connector are plugged into each other, the outer wall of the end of the second inner core inside the female connector contacts the inner side walls of the plurality of elastic springs, causing the plurality of elastic springs to bend away from the axis of the first inner core.

[0006] Preferably, the inner side walls of the ends of the plurality of elastic springs have arc portions.

[0007] Preferably, the elastic spring is a bimetallic strip, which deforms at high temperatures and bends away from the axial direction of the first inner core.

[0008] Preferably, one end of the second inner core facing the first inner core is a tapered portion.

[0009] Preferably, the elastic spring includes a first metal layer and a second metal layer, and the thermal expansion coefficient of the first metal layer is smaller than the thermal expansion coefficient of the second metal layer.

[0010] The beneficial effect of the utility model is that by configuring one end of the first inner core to have a plurality of elastic springs, when the first inner core and the second inner core are plugged into each other, the elastic springs deform themselves to form a clamping force on the second inner core, thereby avoiding poor contact.

[0011] By setting the elastic spring as a bimetallic strip, when the first inner core and the second inner core reach high temperature, the elastic spring can bend in the direction of breaking away from the second inner core, thereby putting the first inner core and the second inner core in an open circuit state, avoiding fire caused by continuous high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation scheme of the present invention or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation schemes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] Figure 1 This is a schematic diagram of the structure of the first state of the prior art of the utility model:

[0014] Figure 2 It is a cross-sectional schematic diagram of the first state of the prior art of the utility model;

[0015] Figure 3 It is a cross-sectional schematic diagram of the second state of the prior art of the utility model;

[0016] Figure 4 It is a cross-sectional schematic diagram of the third state of the prior art of the utility model;

[0017] Figure 5 It is a cross-sectional schematic diagram of the third state of the prior art of the utility model;

[0018] Figure 6 It is a structural diagram of the utility model;

[0019] Figure 7 This is a schematic structural diagram of two inner cores of the utility model;

[0020] Figure 8 This is a schematic diagram of the structure of the utility model after the two inner cores are plugged into each other;

[0021] Figure 9 This is a schematic diagram of the structure of the two inner cores of the present invention being separated from each other due to high temperature;

[0022] Figure 10 This is a schematic structural diagram of the elastic reed of the utility model.

[0023] In the figure, 1, male connector; 101, first sealing cap; 102, first rubber ring; 2, female connector; 201, second sealing cap; 202, second rubber ring; 3, buckle strip; 4, buckle hole; 5, wire; 6, first inner core; 601, elastic spring; 602, arc portion; 603, first metal layer; 604, second metal layer; 7, second inner core; 8, third rubber ring. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0025] refer to Figure 1-Figure 5 The present invention is an existing photovoltaic module wiring device for photovoltaic power generation, which is an MC4 connector, mainly comprising a male head 1, a female head 2, and two inner cores, wherein the male head 1 and the female head 2 can be plugged and locked with each other, and a buckle strip 3 with a triangular end is provided on the male head 1, and a buckle hole 4 is provided on the female head 2. After the buckle strip 3 is inserted into the inside of the buckle hole 4, the end of the buckle strip 3 is hooked on the end face of the buckle hole 4 to achieve locking of the male head 1 and the female head 2. There are also threaded sealing caps on the male head 1 and the female head 2. For the convenience of distinction, the sealing cap on the male head 1 is named the first sealing cap 101, and the sealing cap on the female head 2 is named the second sealing cap 201. The two inner cores are large and small and are roughly hollow tubular. For the convenience of description, the first inner core 6 and the second inner core 7 are used to name and distinguish them. The diameter of the first inner core 6 is larger than the diameter of the second inner core 7. The first inner core 6 is installed inside the male head 1 when in use, and the second inner core 7 is installed inside the female head 2 when in use. The following describes the installation process of the existing MC4 connector.

[0026] First reference Figure 4 and Figure 5 , connect one end of the first inner core 6 and one end of the second inner core 7 to the wire 5 through tools such as wire strippers and wire crimping pliers, and then insert the first inner core 6 with the wire 5 installed into the inside of the male head 1, and the insertion direction is the direction with the first blocking cap 101 (during the insertion process, the first blocking cap 101 is in a relaxed state and can be easily inserted into the inside of the male head 1. The inside of the male head 1 and the female head 2 also have a tapered clamp that cooperates with the threaded blocking cap to clamp the wire 5. The tapered clamp is not drawn in the figure). After insertion, tighten the first blocking cap 101 so that the wire 5 and the first inner core 6 are stably in the inside of the male head 1. In the same way, place the second inner core 7 in the inside of the female head 2 and tighten it. At this time, the MC4 connector is formed as shown in the figure. Figure 1 and Figure 2In the state shown, the male connector 1 and the female connector 2 can be plugged in. After the male connector 1 and the female connector 2 are plugged in, the following is formed: Figure 3 In the state shown, the second inner core 7 is partially inside the first inner core 6, that is, the outer wall of the second inner core 7 contacts the inner wall of the first inner core 6, realizing the connection of the circuit. The existing MC4 connector has the advantages of good sealing and excellent waterproof effect. A first rubber ring 102 is provided on the first blocking cap 101, a second rubber ring 202 is provided on the second blocking cap 201, and a third rubber ring 8 is also provided at the joint of the male head 1 and the female head 2 to prevent rainwater from entering the interior of the MC4 connector.

[0027] The above is an introduction to the existing photovoltaic module wiring device for photovoltaic power generation, namely the MC4 connector. Although the existing MC4 connector has good sealing and waterproof effects, it is also an important component that is prone to fire in the photovoltaic power generation process. The main reason is that the existing MC4 connector relies on the rigid contact between the first inner core 6 and the second inner core 7 to achieve circuit conduction. Since there is rigid contact between the first inner core 6 and the second inner core 7 (the outer wall of the second inner core 7 contacts the inner wall of the first inner core 6), during the production process, if the error between the first inner core 6 and the second inner core 7 is too large, or there is a gap between the male head 1 and the female head 2 that can swing, it will cause poor contact between the first inner core 6 and the second inner core 7. Due to poor contact or critical contact, the MC4 connector is most likely to cause flashover inside the MC4 connector, a sharp increase in temperature, and a fire. Based on this problem, the present invention makes the following improvements to the existing photovoltaic module wiring device for photovoltaic power generation, namely the MC4 connector.

[0028] The main improvement of the present invention is that Figure 6 As shown, the improvement of the first inner core 6 and the second inner core 7 is different from the traditional two inner cores that are hollow tubular. In the present invention, the end of the first inner core 6 inside the male head 1 is made of multiple elastic springs 601, and the multiple elastic springs 601 are evenly spaced circumferentially arranged along the axis of the first inner core 6. One end of the second inner core 7 is a tapered portion 701. The diameter of the circular cross-section formed by the multiple elastic springs 601 is larger than the diameter of the second inner core 7. When the two inner cores are plugged into each other, the tapered end of the second inner core 7 is inserted between the multiple elastic springs 601 of the first inner core 6, and the multiple elastic springs 601 are bent away from the axis of the first inner core 6. Since the elastic spring 601 itself is elastic, it always has a tendency to recover its deformation after deformation, so that it has a clamping force toward its own axis. This clamping force can always maintain the contact between the first inner core 6 and the second inner core 7 when shaking occurs between the male head 1 and the female head 2. Compared with the traditional rigid contact, it is more stable and avoids the occurrence of poor contact.

[0029] Specifically, such as Figure 7and Figure 8 As shown, the inner wall at one end of the elastic spring 601 also has an arc portion 602, which is the main contact point with the second inner core 7 and also plays a guiding role during insertion. That is, during insertion, the second inner core 7 first contacts the arc portion 602, so that the force applied to the elastic spring 601 is directed away from the axis of the first inner core 6, thereby assisting the elastic spring 601 to bend in a specific direction.

[0030] For further reference, Figure 9 and Figure 10 The elastic spring 601 is a bimetallic strip, which has the effect of bending at high temperatures. The bimetallic strip includes a first metal layer 603 and a second metal layer 604, wherein the thermal expansion coefficient of the first metal layer 603 is smaller than the thermal expansion coefficient of the second metal layer 604. For example, the first metal layer 603 is made of iron or an iron alloy, and the second metal layer 604 is made of copper or a copper alloy. Since the expansion coefficient of iron is smaller than the expansion coefficient of copper at high temperatures, the elastic spring 601 will bend away from the axis of the first inner core 6 at high temperatures, that is, away from the direction of contact with the second inner core 7. The end of the second inner core 7 is set to be conical, which can better cooperate with the arc portion 602 at the end of the elastic spring 601 for guidance, so that the elastic spring 601 bends in a specific direction.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic module wiring device for photovoltaic power generation, comprising a male connector (1) and a female connector (2) that can be plugged into each other, a first inner core (6) placed inside the male connector (1) and a second inner core (7) placed inside the female connector (2), characterized in that: One end of the first inner core (6) and the second inner core (7) is used to connect to the wire (5), and a plurality of elastic springs (601) are provided at the end of the first inner core (6) opposite to the connecting wire (5), and the plurality of elastic springs (601) are evenly spaced and circumferentially arranged along the axis of the first inner core (6). When the male connector (1) and the female connector (2) are plugged in, the outer wall of the end of the second inner core (7) inside the female connector (2) contacts the inner side walls of the plurality of elastic springs (601), so that the plurality of elastic springs (601) are bent away from the axis of the first inner core (6).

2. A photovoltaic module wiring device for photovoltaic power generation according to claim 1, characterized in that: The inner side walls of the ends of the plurality of elastic spring pieces (601) have arc portions (602).

3. A photovoltaic module wiring device for photovoltaic power generation according to claim 1, characterized in that: The elastic spring (601) is a bimetallic strip, which deforms at high temperatures and bends away from the axial direction of the first inner core (6).

4. A photovoltaic module wiring device for photovoltaic power generation according to claim 1, characterized in that: One end of the second inner core (7) facing the first inner core (6) is a tapered portion (701).

5. A photovoltaic module wiring device for photovoltaic power generation according to claim 3, characterized in that: The elastic spring (601) comprises a first metal layer (603) and a second metal layer (604), wherein the thermal expansion coefficient of the first metal layer (603) is smaller than the thermal expansion coefficient of the second metal layer (604).

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