A DC switch automatic disconnection mechanism driven by a double shaft

Abstract

The present invention discloses a DC switch automatic disconnection mechanism driven by two shafts, which includes a switch main shaft limit lock, a disconnection mechanism housing, a driven gear, a switch main shaft, a driving gear, a scroll spring, a control ratchet pin, an electromagnet, a ratchet pin limit spring, a moving main shaft, a moving main shaft limit lock, and a knob. The disconnection mechanism housing is a vacuum-insulated outer shell. The driven gear and the driving gear are arranged inside the disconnection mechanism housing, and the driven gear and the driving gear are non-standard parts. The teeth of the driven gear and the driving gear are arranged on a quarter of the root circle. The switch main shaft limit lock is arranged on the side of the driven gear and on the inner side wall of the disconnection mechanism housing. A keyway is provided on the switch main shaft, and it is fixedly connected to the driven gear through a key. The advantages of the present invention compared with the prior art are as follows: When the circuit system of the inverter encounters special working conditions such as overload and short circuit, the present invention can achieve the purpose of remotely disconnecting the inverter system circuit without manual operation.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic switch electrical safety, and specifically refers to a biaxial drive automatic disconnection mechanism for a DC switch. Background Art

[0002] With the extensive construction of photovoltaic systems in China, the safety issues of photovoltaic systems have gradually attracted the attention of the general public and become a hot topic in the industry in recent years. Photovoltaic DC switches are applied in inverters and control the working states of multiple core components. The reliability of photovoltaic DC switches not only relates to the good operation of the entire photovoltaic system, but also relates to the stable development of the photovoltaic industry.

[0003] Looking back on the development process of the photovoltaic industry in the past few years, standards for using photovoltaic switches have been gradually formulated in the industry. Each major manufacturer has been researching to enhance the arc extinguishing ability and disconnection speed of switch contacts. However, most of the rotary photovoltaic switches used in the market at present are manually operated. After a problem is discovered, it requires an operator to manually disconnect the photovoltaic switch, which undoubtedly increases the safety risk of the operator. In 2017, there were multiple inverter burning accidents. If the power supply can be quickly cut off when the inverter malfunctions, the burning accidents can be avoided and the life and property safety of the photovoltaic power station can be protected. Therefore, how to quickly cut off the DC switch when a circuit problem occurs has become an urgent problem to be solved in photovoltaic power stations. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a biaxial drive automatic disconnection mechanism for a DC switch in view of the above problems.

[0005] To solve the above technical problem, the technical solution provided by the present invention is: a biaxial drive automatic disconnection mechanism for a DC switch, including a switch main shaft limit lock, a disconnection mechanism housing, a driven gear, a switch main shaft, a driving gear, a scroll spring, a control ratchet, an electromagnet, a ratchet limit spring, a moving main shaft, a moving main shaft limit lock, and a knob. The disconnection mechanism housing is a plastic housing. The driven gear and the driving gear are arranged inside the disconnection mechanism housing, and the driven gear and the driving gear are non-standard parts. The teeth of the driven gear and the driving gear are arranged on a quarter of the root circle. The switch main shaft limit lock is arranged on the side of the driven gear and on the inner side wall of the disconnection mechanism housing. The switch main shaft is provided with a keyway and is fixedly connected to the driven gear through a key. The scroll spring is arranged above the driving gear. The control ratchet is arranged inside the electromagnet and is limited by the stepped mechanism of the electromagnet. A ratchet limit spring is arranged at the rear end of the control ratchet. The moving main shaft is a round shaft and is assembled in the central hole of the driving gear. The moving main shaft limit lock is arranged on the side of the driving gear and on the inner side wall of the disconnection mechanism housing. The knob is arranged outside the disconnection mechanism housing and at one end of the moving main shaft and is connected through a card slot inside the knob.

[0006] The advantages of the present invention compared with the prior art are as follows: when the circuit system of the inverter encounters special working conditions such as overload and short circuit, the present invention can achieve the purpose of remotely disconnecting the inverter system circuit without manual operation.

[0007] As an improvement, the housing of the disconnecting mechanism is a plastic housing, manufactured by means of mass production using a mold, and made of a special polyether ether ketone polymer material, having advantages such as good toughness and rigidity, excellent dimensional stability characteristics, and good electrical insulation performance.

[0008] As an improvement, the moving gear and the driving gear are non-standard parts, and together with an electromagnet, a scroll spring, and a control ratchet form a new type of double-axis drive automatic disconnecting system. The teeth of the driven gear and the driving gear are provided on a quarter of the root circle, and are designed as steel parts. This new type of double-axis mechanism can achieve the rapid disconnection of the switch through the scroll spring and the control ratchet, without manual operation. Moreover, the double-axis mechanism product of this invention is not limited to photovoltaic electrical safety, and can be installed together with a switch to make a switch with an automatic disconnection function, or can be supplied as a separate component to switch manufacturers for installation or modification according to requirements.

[0009] As an improvement, the shaft ends of the moving gear and the driving gear are relatively long, extending out of the housing of the disconnecting mechanism, and a rubber oil seal ring is provided at the opening of the housing of the disconnecting mechanism.

[0010] As an improvement, only a quarter of the teeth of the moving gear and the driving gear are provided. Therefore, after carburizing treatment, a process flow of high-temperature tempering + quenching + cryogenic treatment + low-temperature tempering is adopted to ensure the strength of the teeth.

[0011] As an improvement, the scroll spring adopts a heat treatment process of quenching heating, oil cooling, and secondary tempering, enabling the scroll spring to have excellent elasticity, good toughness, and a high elastic limit. Moreover, a heat treatment production line is adopted, which reduces the heat treatment time compared with the traditional heat treatment process method, thereby improving the production efficiency. In addition, the energy storage capacity of the scroll spring is good, and the rapid movement and deceleration after movement of the scroll spring after energy storage can achieve easy energy storage during the winding process.

[0012] As an improvement, the knob is a reset switch of the automatic disconnecting mechanism, used for the automatic disconnecting mechanism to disconnect under special working conditions such as overload and short circuit, and after the overhaul is completed, to reset and continue working. Brief Description of the Drawings

[0013] Figure 1 It is a schematic internal structure diagram of a double-axis drive DC switch automatic disconnecting mechanism.

[0014] Figure 2It is a schematic diagram of the three-dimensional housing of a biaxial-driven DC switch automatic disconnection mechanism.

[0015] As shown in the figure: 1. Switch main shaft limit lock, 2. Disconnection mechanism housing, 3. Driven gear, 4. Switch main shaft, 5. Driving gear, 6. Volute spring, 7. Control ratchet pin, 8. Electromagnet, 9. Ratchet pin limit spring, 10. Moving main shaft, 11. Moving main shaft limit lock, 12. Knob. Specific implementation mode

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] When the present invention is specifically implemented, a biaxial-driven DC switch automatic disconnection mechanism includes a switch main shaft limit lock 1, a disconnection mechanism housing 2, a driven gear 3, a switch main shaft 4, a driving gear 5, a volute spring 6, a control ratchet pin 7, an electromagnet 8, a ratchet pin limit spring 9, a moving main shaft 10, a moving main shaft limit lock 11, and a knob 12. The disconnection mechanism housing 2 is a plastic housing. The driven gear 3 and the driving gear 5 are arranged inside the disconnection mechanism housing 2, and the driven gear 3 and the driving gear 5 are non-standard parts. The teeth of the driven gear 3 and the driving gear 5 are arranged on a quarter of the root circle. The switch main shaft limit lock 1 is arranged on the side of the driven gear 3 and on the inner side wall of the disconnection mechanism housing 2. A keyway is arranged on the switch main shaft 4, and it is fixedly connected to the driven gear 3 through a key. The volute spring 6 is arranged above the driving gear 5. The control ratchet pin 7 is arranged inside the electromagnet 8 and is limited by the stepped mechanism of the electromagnet 8. A ratchet pin limit spring 9 is arranged at the rear end of the control ratchet pin 7. The moving main shaft 10 is a round shaft and is assembled in the central hole of the driving gear 5. The moving main shaft limit lock 11 is arranged on the side of the driving gear 5 and on the inner side wall of the disconnection mechanism housing 2. The knob 12 is arranged outside the disconnection mechanism housing 2 and at one end of the moving main shaft 10, and is connected through a card slot inside the knob 12.

[0018] The disconnection mechanism housing 2 is a plastic housing, which is manufactured by a mass production scheme using a mold and is made of a polyether ether ketone special polymer material, having advantages such as good toughness and rigidity, excellent dimensional stability characteristics, and good electrical insulation performance.

[0019] The movable gear 3 and the driving gear 5 are non-standard parts, and together with the electromagnet 8, the volute spring 6, and the control ratchet 7, they form a new dual-axis drive automatic disconnection system. The teeth of the driven gear 3 and the driving gear 5 are arranged on a quarter of the root circle and are designed as steel parts. This new dual-axis mechanism uses the volute spring 6 and the control ratchet 7 to achieve rapid disconnection of the switch without manual operation. This new dual-axis mechanism product is not only limited to photovoltaic electrical safety, but can be installed together with a switch to make a switch with automatic disconnection function. It can also be supplied to the switch manufacturer as a separate component, and the manufacturer will install or modify it according to demand.

[0020] The shaft ends of the movable gear 3 and the driving gear 5 are relatively long and extend out of the disconnect mechanism housing 2 , and rubber oil seals are provided at the openings of the disconnect mechanism housing 2 .

[0021] The teeth of the movable gear 3 and the driving gear 5 are only one quarter, so after carburizing, a process of high temperature tempering + quenching + cryogenic treatment + low temperature tempering is adopted to ensure the strength of the teeth.

[0022] The spiral spring 6 adopts a heat treatment process of quenching heating, oil cooling, and secondary tempering, so that the spiral spring 6 has excellent elasticity, good toughness, and a high elastic limit. The heat treatment assembly line is adopted, which shortens the heat treatment time compared to the traditional heat treatment process method, thereby improving production efficiency. The spiral spring 6 has a good energy storage capacity, and the rapid action after energy storage and the deceleration after action can easily realize energy storage during the winding process.

[0023] The knob 12 is a reset switch of the automatic disconnect mechanism, which is used to disconnect the automatic disconnect mechanism when it encounters special working conditions such as overload and short circuit. After the maintenance is completed, it is reset to continue working.

[0024] Working principle of the present invention: The novel automatic disconnection mechanism is installed together with the Santon photovoltaic switch as the automatic disconnection system of the photovoltaic switch. After the knob of the photovoltaic switch is turned from the OFF position to the ON position, turn the winding knob of the automatic disconnection mechanism to change the scroll spring of the automatic disconnection mechanism from the relaxed state to the stretched state, thereby completing the energy storage of the scroll spring. The energy-stored scroll spring is fixed on the control shaft, and a driving gear is fixed above the control shaft. When the energy storage of the scroll spring is completed, the driving gear is locked by the ratchet control lock and fixed at the energy storage position. When an overload or short circuit occurs in the inverter, etc., the control center can send a signal to the electromagnetic control mechanism of the DC switch. The electromagnet in the electromagnetic control mechanism is energized and has magnetism. The attraction of the electromagnet to the control ratchet is greater than the spring resistance of the limit spring to it. The control ratchet then moves in the direction away from the driving gear and finally disengages from the driving gear. The driving gear lacks the restriction of the control ratchet and rotates clockwise under the drive of the elastic force of the scroll spring. And finally, the gear of the driving shaft and the gear of the switch main shaft are engaged with each other at the midline. Since the torque of the energy storage of the scroll spring is greater than the operating torque of the switch main shaft, the driving shaft where the scroll spring is located can drive the switch main shaft to rotate from the ON position to the OFF position, completing the cutting operation of the DC switch.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "plurality" is two or more unless otherwise specifically defined.

[0026] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0029] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A dual-axis driven DC switch automatic disconnect mechanism, comprising a switch spindle limit lock (1), a disconnect mechanism housing (2), a driven gear (3), a switch spindle (4), a driving gear (5), a volute spring (6), a control ratchet (7), an electromagnet (8), a ratchet limit spring (9), a motion spindle (10), and a motion spindle limit lock (11), wherein the disconnect mechanism housing (2) is a plastic housing, the driven gear (3) and the driving gear (5) are arranged in the disconnect mechanism housing (2), and the driven gear (3) and the driving gear (5) are non-standard parts, and the teeth of the driven gear (3) and the driving gear (5) are arranged on a quarter of the tooth root circle, and the switch The main shaft limit lock (1) is arranged on the side of the driven gear (3) and on the inner side wall of the disconnect mechanism housing (2); the switch main shaft (4) is provided with a keyway and is fixedly connected to the driven gear (3) through a key; the spiral spring (6) is arranged above the driving gear (5); the control ratchet (7) is arranged in the electromagnet (8) and is limited by the step mechanism of the electromagnet (8); and the rear end of the control ratchet (7) is provided with a ratchet limit spring (9); the motion main shaft (10) is a round shaft and is assembled in the center hole of the driving gear (5); the motion main shaft limit lock (11) is arranged on the side of the driving gear (5) and on the inner side wall of the disconnect mechanism housing (2); The disconnect mechanism housing (2) is manufactured using a mold mass production solution and is made of polyetheretherketone special polymer material as the main raw material; The spiral spring (6) adopts a heat treatment process of quenching heating, oil cooling and secondary tempering.

2. The dual-axis driven DC switch automatic disconnect mechanism according to claim 1, characterized in that: The driven gear (3) and the driving gear (5) are designed as steel parts. Under the control of the volute spring (6) and the control ratchet (7), the double-axis mechanism can realize the rapid disconnection of the switch after completing the winding action.

3. The dual-axis driven DC switch automatic disconnect mechanism according to claim 1, characterized in that: The driven gear (3) and the driving gear (5) have only one quarter of their teeth, so after carburizing, a process flow of high-temperature tempering + quenching + deep-cold treatment + low-temperature tempering is adopted.

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