Photovoltaic reverse power transmission expansion interface and grid-connected device

Abstract

The invention discloses a photovoltaic reverse power transmission extension interface and a grid-connected device, which relate to the technical field of extended interface connection, and include a square connector with an interface slot, wherein the interface slot is used for pluggable connection of a power transmission plug, and the power transmission plug has a card slot; and also include: a wedge-shaped dustproof plate, which is movably arranged in the interface slot through a guide mechanism, and has a sealing position for sealing the interface slot during the movable stroke of the wedge-shaped dustproof plate, and the top of the wedge-shaped dustproof plate is fixedly connected with a card strip, and the inclined surface of the wedge-shaped dustproof plate faces the entrance of the interface slot; the photovoltaic reverse power transmission extension interface and the grid-connected device can effectively block the entrance of the docking slot through the arranged wedge-shaped dustproof plate, and effectively prevent dust from entering the conductive head in the interface slot, without using a cleaning tool to clean the dust; at the same time, the power transmission plug can directly abut and cooperate with the inclined surface of the wedge-shaped dustproof plate, thereby opening the entrance of the docking slot and allowing the power transmission plug to be directly inserted into the docking slot.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion interface connection, and in particular to a photovoltaic reverse power transmission expansion interface and a grid-connected device. Background Art

[0002] The photovoltaic reverse power transmission expansion interface is a connection device used in photovoltaic power generation systems. It is mainly used to realize the extended function of power exchange between the photovoltaic system and the external power grid or other power-consuming equipment. Under normal circumstances, the photovoltaic power generation system will transmit the generated power to the power grid or for local load use. When certain special circumstances occur, such as the power grid is out but the photovoltaic system is still generating electricity, reverse power transmission may occur. This interface can effectively manage and expand the connection of this reverse power transmission process.

[0003] At present, in the prior art, photovoltaic power generation equipment is usually installed in a relatively large outdoor area, and often encounters windy and sandy weather, and most of the spare expansion interfaces do not have dust covers at the entrances, resulting in the need to clean the inside of the expansion interface in advance before using the spare expansion interface in an emergency (such as damage to the normal interface), which greatly affects the plug-in efficiency of the plug; based on this, even if some spare expansion interfaces are equipped with dust covers, the existing connection devices are usually located at high places, so for safety reasons, operators usually use tools to insert the plug into the expansion interface. As a result, during the plug-in process, it is necessary to open the dust cover first, and then the plug can be inserted into the expansion interface. The operation process is relatively cumbersome, which increases the time for inserting the plug into the expansion interface to a certain extent. Summary of the invention

[0004] The purpose of the present invention is to provide a photovoltaic reverse power transmission expansion interface and a grid-connected device to solve the deficiencies in the above-mentioned prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a photovoltaic reverse power transmission expansion interface and a grid-connected device, comprising a square connector with an interface groove, wherein the interface groove is used for pluggable connection of a power transmission plug, and the power transmission plug has a card slot; further comprising: a wedge-shaped dustproof plate, which is movably arranged in the interface groove through a guide mechanism, and a sealing position for sealing the interface groove is provided in the movable stroke of the wedge-shaped dustproof plate, and a card strip is fixedly connected to the top of the wedge-shaped dustproof plate, and the inclined surface of the wedge-shaped dustproof plate faces the entrance of the interface groove; when the power transmission plug is inserted into the interface groove, the wedge-shaped dustproof plate is squeezed to drive the wedge-shaped dustproof plate out of the sealing position until the card strip is stuck in the card slot on the power transmission plug.

[0006] Preferably, a shaft is rotatably connected to the square joint, and a telescopic rod is provided between the shaft and the wedge-shaped dustproof plate, one end of the telescopic rod is rotatably connected to the wedge-shaped dustproof plate, and the other end is fixedly connected to the shaft; a first elastic member is provided between the shaft and the square joint, and the process of the first elastic member restoring elastic deformation drives the wedge-shaped dustproof plate to move up.

[0007] Preferably, the guide mechanism is a guide groove, which includes a vertical groove opened in the interface groove, a horizontal groove opened at a non-end position of the vertical groove, and the wedge-shaped dustproof plate is fixedly connected to a guide slider located in the guide groove. During the process of inserting the power transmission plug into the interface groove, the wedge-shaped dustproof plate is squeezed to make the wedge-shaped dustproof plate slide down along the vertical groove until the card strip is aligned with the card slot. After that, the first elastic member restores its elasticity and drives the wedge-shaped dustproof plate to retreat along the vertical groove to the junction of the vertical groove and the horizontal groove so that the card strip can be inserted into the card slot.

[0008] Preferably, the square connector is further provided with at least one driving mechanism for driving the power transmission plug to disconnect from the conductive head of the square connector, and the driving mechanism comprises: a limiting cavity, which is opened in the square connector; a first wedge block, which is slidably connected in the limiting cavity; a heat conducting part, which is fixedly connected in the square connector, one end of the heat conducting part is located in the interface groove, and the other end is located in the limiting cavity; a memory metal spring, one end of which is fixedly connected to the heat conducting part, and the other end of which is fixedly connected to the first wedge block; a transmission part, which comprises a second wedge block and a connecting rod, and the inclined surface of the second wedge block slides between the inclined surface of the first wedge block The connection is that the connecting rod is fixedly connected to the second wedge block, and the connecting rod and the wedge-shaped dustproof plate are vertically slidably connected; the baffle rod is fixedly connected to the inner wall of the interface groove, and the baffle rod is abutted against the connecting rod; the heat conducting part transfers the heat source to the memory metal spring to stretch the memory metal spring and drive the first wedge block to slide along the limiting cavity in the following strokes: the first stroke, the first wedge block drives the second wedge block to move upward to make the connecting rod disengage from the baffle rod; the second stroke, the first wedge block drives the wedge-shaped dustproof plate to slide along the transverse groove through the second wedge block to make the power transmission plug engaged on the wedge-shaped dustproof plate disengage from the conductive head in the square socket.

[0009] Preferably, a first sliding groove is provided on the first wedge-shaped block along the inclination direction of the inclined surface, and a first sliding block located in the first sliding groove is fixedly connected to the inclined surface of the second wedge-shaped block.

[0010] Preferably, a sealing soft rubber pad is fixedly connected to the vertical surface of the wedge-shaped dustproof plate.

[0011] Preferably, the first elastic member is a torsion spring, which is sleeved on the shaft rod, and one end of the torsion spring is fixedly connected to the square joint, and the other end is fixedly connected to the shaft rod.

[0012] A grid-connected device comprises a box and the above-mentioned photovoltaic reverse power transmission expansion interface, wherein the photovoltaic reverse power transmission expansion interface is arranged in the box.

[0013] In the above technical scheme, the present invention provides a photovoltaic reverse power transmission expansion interface and grid-connected device. In the process of pushing the power transmission plug into the interface slot, the inclined surface of the wedge-shaped dustproof plate can be squeezed to make the inclined dustproof plate slide relative to the square joint until the card strip of the wedge-shaped dustproof plate is aligned with the card slot of the power transmission plug, and then the wedge-shaped dustproof plate moves up to allow the card strip to be inserted into the card slot, thereby locking the wedge-shaped dustproof plate, thereby preventing the wedge-shaped dustproof plate from being disconnected from the conductive head in the power transmission plug. The above process can facilitate the staff to insert the power transmission plug directly into the interface slot and dock it with the conductive head through tools, without the need to use other tools to open the wedge-shaped dustproof plate in advance, thereby completing the power-on process between the power transmission plug and the conductive head in the square connector, thereby reducing the operation steps and shortening the plug-in time to a certain extent; at the same time, before the spare square connector is not inserted into the power transmission plug, the wedge-shaped dustproof plate is always in the sealing position, thereby blocking the entrance of the interface slot, effectively preventing dust from entering the conductive head in the interface slot, and there is no need to use cleaning tools to clean the dust, which not only extends the service life of the entire device, but also allows the power transmission plug to be quickly plugged in in some emergency situations; among them, when the card strip is inserted into the card slot, the wedge-shaped dustproof plate can be used to prevent the power transmission plug from being separated from the interface slot due to external interference, thereby effectively maintaining the power-on state between the power transmission plug and the square connector.

[0014] Since the above-mentioned photovoltaic reverse power transmission extension interface has the above-mentioned technical effects, the photovoltaic reverse power transmission extension interface should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of the internal structure of a square connector provided in an embodiment of the present invention;

[0018] Figure 3 The motion state of the wedge-shaped dustproof plate provided in the embodiment of the present invention Figure Ⅰ ;

[0019] Figure 4 The motion state of the wedge-shaped dustproof plate provided in the embodiment of the present invention Figure II ;

[0020] Figure 5 A disassembled diagram of a first wedge block and a second wedge block provided in an embodiment of the present invention;

[0021] Figure 6 A schematic diagram of the structure of a power transmission plug provided in an embodiment of the present invention;

[0022] Figure 7 The inner plane of the square joint provided by the embodiment of the present invention Figure Ⅰ ;

[0023] Figure 8 The motion state of the power transmission plug provided by the embodiment of the present invention Figure Ⅰ ;

[0024] Fig. 9 The motion state of the power transmission plug provided by the embodiment of the present invention Figure II ;

[0025] Fig.10 The inner plane of the square joint provided by the embodiment of the present invention Figure II ;

[0026] Fig.11 The embodiment of the present invention provides Figure 2 A is an enlarged view of the middle image.

[0027] Description of reference numerals:

[0028] 1. Square connector; 2. Interface slot; 3. Power plug; 4. Card slot; 5. Wedge-shaped dust plate; 6. Card strip; 7. Guide mechanism; 71. Vertical slot; 72. Horizontal slot; 8. Axle rod; 9. Telescopic rod; 10. First elastic member; 11. Driving mechanism; 111. Limiting cavity; 112. First wedge block; 113. Heat conducting part; 114. Memory metal spring; 115. Second wedge block; 116. Connecting rod; 1161. Horizontal rod; 1162. Vertical rod; 117. Stop rod; 12. First slide groove; 13. First slider. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] See also Figure 1-11A photovoltaic reverse power transmission expansion interface and a grid-connected device provided in an embodiment of the present invention include a wedge-shaped dustproof plate 5 and a square connector 1 with an interface groove 2, the interface groove 2 is used for pluggable connection of a power transmission plug 3, and the power transmission plug 3 has a card slot 4; the wedge-shaped dustproof plate 5 is movably arranged in the interface groove 2 through a guide mechanism 7, and a sealing position for sealing the interface groove 2 is provided in the movable stroke of the wedge-shaped dustproof plate 5, and a card strip 6 is fixedly connected to the top of the wedge-shaped dustproof plate 5, and the inclined surface of the wedge-shaped dustproof plate 5 faces the entrance of the interface groove 2 (towards the outside of the entrance); when the power transmission plug 3 is inserted into the interface groove 2, the wedge-shaped dustproof plate 5 is squeezed to drive the wedge-shaped dustproof plate 5 out of the sealing position until the card strip 6 is stuck in the card slot 4 on the power transmission plug 3. It should be noted that the power plug 3 can be fixedly connected with a third wedge block, and a guide groove is provided at the bottom end of the interface groove 2. Based on this, before inserting the power plug 3 into the interface groove 2, the third wedge block is placed in the guide groove, so that when the power plug 3 is pushed so that the inclined surface of the third wedge block can abut against the inclined surface of the wedge-shaped dustproof plate 5 during the insertion of the plug into the interface groove 2, the wedge-shaped dustproof plate 5 is driven to move downward and leave the sealing position; wherein, the setting of the guide groove can play a guiding role, so that the power plug 3 can directly dock with the conductive head in the interface groove 2 during the insertion process, so that the plugging process can be better performed. It should be noted that a conductive head is fixedly connected in the interface groove 2. When the power plug 3 and the conductive head are in abutment, it indicates that the power plug 3 and the conductive head in the square connector 1 are in a power-on state. Based on this, when the power plug 3 is separated from the conductive head, it indicates that the power plug 3 and the conductive head in the square connector 1 are in a power-off state.

[0031] Among them, in this embodiment, the guide mechanism 7 is a guide groove, based on which the guide groove can be a vertical groove 71 only opened on the inner wall of the interface groove 2, and at the same time, the wedge-shaped dustproof plate 5 is slidably connected with the square connector 1 along the vertical groove 71, so that the vertical groove 71 can limit the movement of the wedge-shaped dustproof plate 5 along the insertion direction of the power plug 3 so that the power plug 3 and the conductive head in the square connector 1 are in a power-off state.

[0032] Specifically, in the process of pushing the power transmission plug 3 into the interface slot 2, the inclined surface of the wedge-shaped dustproof plate 5 can be squeezed to make the inclined dustproof plate slide relative to the square connector 1 until the clamping strip 6 of the wedge-shaped dustproof plate 5 is aligned with the clamping slot 4 of the power transmission plug 3, and then the wedge-shaped dustproof plate 5 is moved up to insert the clamping strip 6 into the clamping slot 4, thereby locking the wedge-shaped dustproof plate 5, thereby preventing the wedge-shaped dustproof plate 5 from being disconnected from the conductive head in the power transmission plug 3. The above process can facilitate the staff to directly insert the power plug 3 into the interface slot 2 and dock with the conductive head through tools, without the need to use other tools to open the wedge-shaped dustproof plate 5 in advance, thereby completing the power-on process between the power plug 3 and the conductive head in the square connector 1, thereby reducing the operation steps and shortening the plug-in time to a certain extent; at the same time, before the spare square connector 1 is not inserted into the power plug 3, the wedge-shaped dustproof plate 5 is always in the sealing position, thereby blocking the entrance of the interface slot 2, effectively preventing dust from entering the conductive head in the interface slot 2, and there is no need to use a cleaning tool to clean the dust, which not only extends the service life of the entire device, but also allows the power plug 3 to be quickly plugged in in some emergency situations (such as damage to the normal interface); wherein, when the card strip 6 is inserted into the card slot 4, the wedge-shaped dustproof plate 5 can be used to prevent the power plug 3 from being separated from the interface slot 2 due to external interference, thereby effectively maintaining the power-on state between the power plug 3 and the square connector 1.

[0033] Among them, the square joint 1 is rotatably connected with a shaft rod 8, and a telescopic rod 9 is provided between the shaft rod 8 and the wedge-shaped dustproof plate 5, one end of which is rotatably connected to the wedge-shaped dustproof plate 5, and the other end is fixedly connected to the shaft rod 8; a first elastic member 10 is provided between the shaft rod 8 and the square joint 1, and the process of the first elastic member 10 restoring elastic deformation drives the wedge-shaped dustproof plate 5 to move up. Among them, the first elastic member 10 is a torsion spring, which is sleeved on the shaft rod 8, and one end of the torsion spring is fixedly connected to the square joint 1, and the other end is fixedly connected to the shaft rod 8, and the process of the torsion spring restoring elastic deformation drives the wedge-shaped dustproof plate 5 to move up. Based on this, when the wedge-shaped dustproof plate 5 is in the sealing position, the inner rod of the telescopic rod 9 is tilted upward under the elastic force of the torsion spring. At this time, the elastic force of the torsion spring to restore the elastic deformation can be decomposed into a horizontal force and a vertical force. The horizontal force is used to drive the wedge-shaped dustproof plate 5 to abut against the entrance of the interface groove 2, and the vertical force drives the wedge-shaped dustproof plate 5 to abut against the top of the interface groove 2, thereby further improving the blocking effect of the wedge-shaped dustproof plate 5. Among them, when the power transmission plug 3 abuts against the conductive head in the interface groove 2 and is in the power-on state, the inner rod of the telescopic rod 9 is tilted downward and extended to make the wedge-shaped dustproof plate 5 leave the sealing position.

[0034] Specifically, the wedge-shaped dustproof plate 5 is squeezed during the insertion of the power plug 3 into the interface slot 2, and the shaft rod 8 overcomes the elastic force of the first elastic member 10 to restore the deformation and rotates relative to the square joint 1 so that the wedge-shaped dustproof plate 5 moves downward relative to the square joint 1 and leaves the sealing position. Then, the power plug 3 is pushed to slide along the interface slot 2 so that the power plug 3 abuts against the conductive head in the interface slot 2 and is in a power-on state. At this time, the clamping strip 6 is aligned with the clamping slot 4. Then, the process of the first elastic member 10 restoring the elastic deformation will drive the wedge-shaped dustproof plate 5 to move upward so that the clamping strip 6 is inserted into the clamping slot 4. At this point, the power plug 3 can be maintained in the power-on state and can be prevented from leaving the power-on state.

[0035] Among them, as a preferred embodiment of the present invention, the guide mechanism 7 is a guide groove, which includes a vertical groove 71 opened in the interface groove 2, and a horizontal groove 72 is opened at the non-end position of the vertical groove 71. The wedge-shaped dustproof plate 5 is fixedly connected with a guide slider located in the guide groove. During the insertion of the power transmission plug 3 into the interface groove 2, the wedge-shaped dustproof plate 5 is squeezed to make the wedge-shaped dustproof plate 5 slide down along the vertical groove 71 until the clamping strip 6 is aligned with the clamping groove 4. After that, during the process of the first elastic member 10 restoring its elasticity, the wedge-shaped dustproof plate 5 is driven to retreat along the vertical groove 71 to the intersection of the vertical groove 71 and the horizontal groove 72 so that the clamping strip 6 is inserted into the clamping groove 4. Among them, the guide mechanism 7 can preferably be provided with two, and the two guide mechanisms 7 are symmetrically arranged in the square joint 1. Based on this, the wedge-shaped dustproof plate 5 is more stable in the travel relative to the square joint 1.

[0036] Among them, at least one driving mechanism 11 for driving the power transmission plug 3 to disconnect from the conductive head of the square connector 1 is also provided in the square connector 1. The driving mechanism 11 includes a limiting cavity 111, a first wedge block 112, a heat conducting part 113, a memory metal spring 114, a transmission part and a blocking rod 117. The limiting cavity 111 is opened in the square connector 1; the first wedge block 112 is slidably connected in the limiting cavity 111; the heat conducting part 113 is fixedly connected in the square connector 1, one end of the heat conducting part 113 is located in the interface groove 2, and the other end is located in the limiting cavity 111; one end of the memory metal spring 114 is fixedly connected to the heat conducting part 113, and the other end is fixedly connected to the first wedge block 112; the transmission part includes a second wedge block 115 and a connecting rod 116, and the inclined surface of the second wedge block 115 is connected to the first wedge block 116. The inclined surfaces of the blocks 112 are slidably connected, the connecting rod 116 is fixedly connected to the second wedge block 115, and the connecting rod 116 is vertically slidably connected to the wedge-shaped dustproof plate 5; the blocking rod 117 is fixedly connected to the inner wall of the interface groove 2, and the blocking rod 117 is abutted against the connecting rod 116; the heat conducting part 113 transfers the heat source to the memory metal spring 114 to stretch the memory metal spring 114 and drive the first wedge block 112 to slide along the limiting cavity 111 in the following strokes: in the first stroke, the first wedge block 112 drives the second wedge block 115 to move upward so that the connecting rod 116 is disengaged from the blocking rod 117; in the second stroke, the first wedge block 112 drives the wedge-shaped dustproof plate 5 to slide along the transverse groove 72 through the second wedge block 115 so that the power transmission plug 3 engaged on the wedge-shaped dustproof plate 5 is disengaged from the conductive head in the square socket. Among them, a limiting groove is opened on the wedge-shaped dustproof plate 5, and a limiting slider located in the limiting groove is fixedly connected to the connecting rod 116. At this point, when the wedge-shaped dustproof plate 5 moves down relative to the square joint 1 and leaves the sealing position, the limiting slider slides along the limiting groove; based on this, when the guide slider is located at the junction of the vertical groove 71 and the horizontal groove 72, the abutment cooperation between the set blocking rod 117 and the connecting rod 116 is used to prevent the wedge-shaped dustproof plate 5 from sliding along the direction of the interface groove 2, so that the power transmission plug 3 can be stably maintained in the power-on state to improve the stability of the connection between the power transmission plug 3 and the square joint 1.It should be further explained that the connecting rod 116 includes a vertical rod 1162 and a horizontal rod 1161, the vertical rod 1162 is fixedly connected to the second wedge block 115, and the horizontal rod 1161 is fixedly connected to the top of the vertical rod 1162. At the same time, the horizontal rod 1161 is located on the side of the blocking rod 117. Based on this, when the horizontal rod 1161 abuts against the blocking rod 117, the abutment between the horizontal rod 1161 and the blocking rod 117 is used to prevent the wedge-shaped dust plate 5 from driving the power transmission plug 3 out of the power-on state. When the second wedge block 115 moves up so that the lower surface of the cross bar 1161 is flush with the upper surface of the baffle rod 117, the cross bar 1161 is disengaged from the baffle rod 117. At this point, the wedge-shaped dustproof plate 5 can drive the power transmission plug 3 engaged in the card strip 6 and the card slot 4 to be out of the power-on state through the limit slider; it should be further explained that when the wedge-shaped dustproof plate 5 slides along the cross groove 72 through the guide slider, the lower surface of the cross bar 1161 is always sliding along the upper surface of the baffle rod 117. Among them, a linear groove with closed ends is opened in the limiting cavity 111, and a moving block located in the linear groove is fixedly connected to the first wedge block 112. At this time, the memory metal spring 114 drives the first wedge block 112 to move linearly so that the wedge-shaped dustproof plate 5 drives the power transmission plug 3 out of the power-on state, and the moving block moves from one end of the linear groove close to the heat conducting part 113 to the other end, thereby limiting the first wedge block 112 from completely leaving the limiting cavity 111.

[0037] It should be noted that the memory metal spring 114 is made of shape memory alloy wire, utilizing the memory effect of the shape memory alloy, and its preferred expansion and contraction temperature is 85°C-105°C. At low temperatures (room temperature and the temperature generated by normal operation of the circuit), the memory metal spring 114 is in a free spring state, and at high temperatures (between 85°C-105°C), the memory metal spring 114 is in an extended state.

[0038] Among them, the heat-conducting part 113 can be made of heat-conducting materials in the existing technology, such as a heat-conducting silicone sheet, which is a heat-conducting medium material synthesized by a special process with silicone as the base material and various auxiliary materials such as metal oxides. It effectively improves the heat transfer efficiency and can transfer the heat source in the interface slot 2 to the memory metal spring 114, so that the memory metal spring 114 can switch from a free state to an extended state at high temperature.

[0039] The first wedge block 112 is provided with a first slide groove 12 along the inclined direction of the inclined surface, and the first slider 13 located in the first slide groove 12 is fixedly connected to the inclined surface of the second wedge block 115. It should be noted that the first slider 13 can only slide along the length direction of the first slide groove 12, so that the cross section of the first slide groove 12 in the length direction can be L-shaped or T-shaped, so that the inclined surface of the first wedge block 112 and the inclined surface of the second wedge block 115 are always in abutment, so that the first wedge block 112 can drive the second wedge block 115 to move up relative to the wedge dust plate 5 during the sliding stroke along the limiting cavity 111, so that the cross bar 1161 of the connecting rod 116 is separated from the blocking rod 117, so that the wedge dust plate 5 can slide in the cross groove 72 through the guide slider. Specifically, when the inclined surface of the first wedge block 112 abuts against the inclined surface of the second wedge block 115 to move the second wedge block 115 upward, the first slider 13 slides linearly along the length direction of the first slide groove 12 until the cross bar 1161 of the connecting rod 116 disengages from the blocking rod 117.

[0040] Specifically, when a short circuit or other phenomenon occurs in the photovoltaic power equipment connected to the conductive head in the square connector 1, causing overheating between the conductive head and the power transmission plug 3, the heat conducting portion 113 transmits the heat source generated by the overheating between the conductive head and the power transmission plug 3 to the memory metal spring 114, so that the memory metal spring 114 switches from a free state to an extended state, and the memory metal spring 114 drives the first wedge block 112 to slide along the limiting cavity 111, and the inclined surface of the first wedge block 112 abuts against the inclined surface of the second wedge block 115. At this point, the second wedge block 115 can be moved up to allow the cross bar 1161 of the connecting rod 116 to disengage from the blocking rod 117. At this point, the first wedge block 112 can drive the second wedge block 115 to slide along the length direction of the blocking rod 117. At the same time, the second wedge block 115 can drive the wedge-shaped dustproof plate 5 to slide along the cross groove 72 through the cooperation between the limiting sliding block and the limiting sliding groove provided on the wedge-shaped dustproof plate 5. At this point, the power transmission plug 3 engaged with the card strip 6 and the card slot 4 also slides with the wedge-shaped dustproof plate 5, thereby causing the wedge-shaped dustproof plate 5 to be out of the power-on state.

[0041] Based on the process in the above preferred embodiment, when a short circuit or other phenomenon occurs in the photovoltaic power equipment connected to the conductive head in the square connector 1, causing overheating between the conductive head and the power transmission plug 3, the connection between the power transmission plug 3 and the conductive head in the square connector 1 can be disconnected in time, thereby avoiding long-term process phenomena that may cause fire and damage to equipment, etc., which not only improves the safety of the entire square connector 1, but also increases the practicality of the entire device.

[0042] Among them, in a preferred embodiment of the present invention, an insulating hand lever is coaxially fixedly connected to the shaft rod 8. At this point, the normal operation is to rotate the hand lever to drive the shaft rod 8 to rotate so that the wedge-shaped dust shield 5 moves from the junction of the vertical groove 71 and the horizontal groove 72 to the bottom end of the vertical groove 71, thereby releasing the lock of the wedge-shaped dust shield 5 on the power plug 3, thereby facilitating the insertion of the power plug 3.

[0043] Among them, based on Figure 8-10 As shown, it should be further explained that the interface slot 2 includes a first cavity, a second cavity and a variable diameter cavity located between the first cavity and the second cavity, and the cross-sectional area of ​​the second cavity is smaller than the cross-sectional area of ​​the first cavity, wherein the variable diameter cavity facilitates the insertion of the power plug 3 from the first cavity into the second cavity, and the cross-sectional area of ​​the power plug 3 is adapted to the second cavity; at the same time, when the power plug 3 follows the movement of the wedge-shaped dustproof plate 5 and leaves the power-on state, the end face of the power plug 3 is located in the first cavity, and at this time, it is only necessary to move the entire power plug 3 up a certain distance to make the card strip 6 disengage from the card slot 4, and then the entire power plug 3 can be pulled out.

[0044] The present invention also includes a grid-connected device, which includes a box (not shown in the figure), and the above-mentioned photovoltaic reverse power transmission expansion interface is arranged in the box. Specifically, the square connector 1 is fixedly connected in the box. At the same time, the power equipment in the box is electrically connected to the conductive head in the docking groove.

[0045] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A photovoltaic reverse power transmission expansion interface, comprising a square connector with an interface slot, wherein the interface slot is used for pluggable connection of a power transmission plug, and the power transmission plug has a card slot; characterized in that: Also includes: A wedge-shaped dustproof plate is movably arranged in the interface groove through a guide mechanism, and has a sealing position for sealing the interface groove during the movable stroke of the wedge-shaped dustproof plate. A clamping strip is fixedly connected to the top of the wedge-shaped dustproof plate, and the inclined surface of the wedge-shaped dustproof plate faces the entrance of the interface groove; When the power transmission plug is inserted into the interface slot, the wedge-shaped dustproof plate is squeezed to drive the wedge-shaped dustproof plate out of the sealing position until the card strip is inserted into the card slot on the power transmission plug; The square joint is rotatably connected to a shaft rod, a telescopic rod is provided between the shaft rod and the wedge-shaped dustproof plate, one end of the telescopic rod is rotatably connected to the wedge-shaped dustproof plate, and the other end is fixedly connected to the shaft rod; a first elastic member is provided between the shaft rod and the square joint, and the process of the first elastic member restoring elastic deformation drives the wedge-shaped dustproof plate to move up; The guide mechanism is a guide groove, the guide groove includes a vertical groove opened in the interface groove, a horizontal groove is opened at a position other than the end of the vertical groove, and a guide slider located in the guide groove is fixedly connected to the wedge-shaped dustproof plate. When the power transmission plug is inserted into the interface groove, the wedge-shaped dustproof plate is squeezed to slide down along the vertical groove until the card strip is aligned with the card groove, and then the first elastic member is driven to retreat along the vertical groove to the intersection of the vertical groove and the horizontal groove during the process of restoring elasticity so that the card strip is inserted into the card groove; The square connector is also provided with at least one driving mechanism for driving the power transmission plug to disconnect from the conductive head of the square connector, and the driving mechanism comprises: A limiting cavity is provided in the square joint; A first wedge-shaped block, which is slidably connected in the limiting cavity; The heat conducting part is fixedly connected in the square joint, one end of the heat conducting part is located in the interface groove, and the other end is located in the limiting cavity; A memory metal spring, one end of which is fixedly connected to the heat conducting portion, and the other end of which is fixedly connected to the first wedge-shaped block; The transmission part includes a second wedge block and a connecting rod, wherein the inclined surface of the second wedge block is slidably connected to the inclined surface of the first wedge block, the connecting rod is fixedly connected to the second wedge block, and the connecting rod is vertically slidably connected to the wedge-shaped dustproof plate; A blocking rod is fixedly connected to the inner wall of the interface groove, and the blocking rod is abutted and matched with the connecting rod; The heat conducting part transfers the heat source to the memory metal spring to stretch the memory metal spring and drive the first wedge block to slide along the limiting cavity in the following sequence: In the first stroke, the first wedge block drives the second wedge block to move upward to separate the connecting rod from the blocking rod; In the second stroke, the first wedge block drives the wedge-shaped dustproof plate to slide along the transverse groove through the second wedge block so that the power transmission plug engaged on the wedge-shaped dustproof plate is separated from the conductive head in the square socket; The connecting rod includes a vertical rod and a horizontal rod. The vertical rod is fixedly connected to the second wedge-shaped block, and the horizontal rod is fixedly connected to the top of the vertical rod. At the same time, the horizontal rod is located on the side of the baffle rod. When the horizontal rod abuts against the baffle rod, the horizontal rod abuts against the baffle rod to prevent the wedge-shaped dustproof plate from driving the power transmission plug out of the power-on state. When the second wedge-shaped block moves upward to make the lower surface of the horizontal rod flush with the upper surface of the baffle rod, the horizontal rod disengages from the baffle rod, so that the wedge-shaped dustproof plate drives the power transmission plug engaged in the card strip and the card slot out of the power-on state through the limit slider.

2. A photovoltaic reverse power transmission expansion interface according to claim 1, characterized in that: A first sliding groove is provided on the first wedge-shaped block along the inclination direction of the inclined surface, and a first sliding block located in the first sliding groove is fixedly connected to the inclined surface of the second wedge-shaped block.

3. A photovoltaic reverse power transmission expansion interface according to claim 1, characterized in that: A sealing soft rubber pad is fixedly connected to the vertical surface of the wedge-shaped dustproof plate.

4. A photovoltaic reverse power transmission expansion interface according to claim 1, characterized in that: The first elastic member is a torsion spring, which is sleeved on the shaft rod, and one end of the torsion spring is fixedly connected to the square joint, and the other end is fixedly connected to the shaft rod.

5. A grid-connected device, characterized in that: It comprises a box body and a photovoltaic reverse power transmission expansion interface as described in any one of claims 1 to 4 arranged in the box body.

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