Abstract: A quick-change structure for liquid-cooled charging gun, relating to the field of new energy electric vehicle charging, comprises a charging connector main assembly; one side of the charging connector main assembly is fixedly connected with a terminal fixing assembly, and a detachable quick-change terminal is arranged inside the terminal fixing assembly; the detachable quick-change terminal is fixedly connected to the charging connector main assembly, the front side of the charging connector main assembly is provided with a detachable quick-change gun connector head assembly. The detachable structure realizes effective saving of excessive maintenance costs, labour-hours and material costs. Worn out terminals can be completely replaced within a few minutes after the power is confirmed cut off, and no other actions are required on the charging connector end or harness end.

Abstract: A turbine fracturing system and a controlling method thereof, a controlling apparatus and a storage medium are provided. The turbine fracturing system includes: N turbine fracturing apparatuses, wherein each of the N turbine fracturing apparatuses comprises a turbine engine, and N is an integer greater than or equal to 2; a fuel gas supply apparatus connected to the N turbine engines, wherein the fuel gas supply apparatus is configured to supply fuel gas and distribute the fuel gas to the N turbine engines as gaseous fuel; and a fuel liquid supply apparatus connected to at least one of the N turbine engines and configured to supply liquid fuel to at least one of the N turbine engines in a case that at least one of a flow rate and a pressure of the fuel gas decreases.

Abstract: Embodiments of the disclosure provide a system for controlling laser pulses emitted by an optical sensing device. The system may include a laser emitter configured to emit a plurality of laser pulses, a power source configured to deliver electrical currents to the laser emitter, and a control circuit configured to deliver electrical currents from the power source to the laser emitter. The control circuit may include a first control path configured to deliver a first electrical current rising at a first rate from the power source to the laser emitter to emit a first laser pulse. The control circuit may also include a second control path configured to deliver a second electrical current rising at a second rate from the power source to the laser emitter to emit a second laser pulse following the first laser pulse. The second rate may be higher than the first rate.

Abstract: A system for supplying combustion gas to a turbine engine for fracturing operation by fracturing manifold equipment is disclosed. The system may include a gas supply device, a gas delivery manifold, a filtering device, a gas detecting system and a connecting device. The gas delivery manifold, and the filtering device, and the gas detecting system are integrated on the fracturing manifold equipment. The gas supply device is connected to the gas delivery manifold through the filtering device. The gas delivery manifold supplies gas to the turbine engine through the connecting device. The disclosed system help reduce operational risk, save floor space, reduce wiring/routing of on-site delivery manifold, enhance connection efficiency, and reduce the complexity of wellsite installation.

Abstract: An electrically-driven fracturing system, which includes a main power generation device, a first auxiliary power generation device, a switch device, and an electrically-driven fracturing device; the switch device includes a low-voltage switch group and a high-voltage switch group; the electrically-driven fracturing device includes a fracturing motor and a fracturing auxiliary device; a rated generation power of the main power generation device is greater than a rated generation power of the first auxiliary power generation device, a rated output voltage of the main power generation device is greater than a rated output voltage of the first auxiliary power generation device, the high-voltage switch group includes an input end and an output end, and the low-voltage switch group includes an input end and an output end, the input end of the high-voltage switch group is connected to the main power generation device, the output end of the high-voltage switch group is connected to the fracturing motor, the input end

Abstract: A system for supplying combustion gas to a turbine engine for fracturing operation by fracturing manifold equipment is disclosed. The system may include a gas supply device, a gas delivery manifold, a filtering device, a gas detecting system and a connecting device. The gas delivery manifold, and the filtering device, and the gas detecting system are integrated on the fracturing manifold equipment. The gas supply device is connected to the gas delivery manifold through the filtering device. The gas delivery manifold supplies gas to the turbine engine through the connecting device. The disclosed system help reduce operational risk, save floor space, reduce wiring/routing of on-site delivery manifold, enhance connection efficiency, and reduce the complexity of wellsite installation.

Abstract: An operation method of a turbine fracturing device and a turbine fracturing device are provided. The turbine fracturing device includes a turbine engine, a speed reducer, a brake mechanism, and a fracturing pump, the method includes: driving, by the turbine engine, the fracturing pump to perform a fracturing operation through the speed reducer so as to keep the fracturing pump in an operating state, the fracturing pump being configured to suck fluid of a first pressure and discharge fluid of a second pressure, the second pressure being greater than the first pressure; and in response to an idling instruction, the turbine engine entering an idling state and triggering a brake operation so as to keep the fracturing pump in a non-operating state.

Abstract: The present disclosure provides a standardized and virus-free rapid propagation method of Dianthus caryophyllus, belonging to the technical field of asexual propagation. The method includes the following steps: conducting virus detection on a Dianthus caryophyllus explant, and inoculating the explant into an induction medium for induction culture; after the explant germinates, cutting buds, and determining whether a virus-free treatment is required according to a virus detection result, and continuing cultivating the buds; after cultivating to obtain cluster buds, inoculating the cluster buds into an expanding propagation medium for expanding propagation, and conducting the virus detection to eliminate a virus-carrying material; conducting expanding propagation on a virus-free material to a certain base, and transferring the virus-free material to a rooting medium for rooting culture.

Abstract: A gas turbine overspeed protection method includes: a power utilization load of a generator is acquired, and a rotating speed value of a gas turbine is acquired; whether the power utilization load suddenly decreases or disappears is judged, and if so, an eddy current retarder is controlled by a controller to simulate the power utilization load to provide a braking torque for the generator; or, whether the rotating speed value exceeds a set speed range is judged, and if so, the gas turbine is controlled by the controller to reduce fuel supply, and a discharge valve of a gas compressor is opened to discharge a high-pressure gas to reduce the power output and the rotating speed of the gas turbine.

Abstract: A turbine fracturing system and a controlling method thereof, a controlling apparatus and a storage medium are provided. The turbine fracturing system includes: N turbine fracturing apparatuses, wherein each of the N turbine fracturing apparatuses comprises a turbine engine, and N is an integer greater than or equal to 2; a fuel gas supply apparatus connected to the N turbine engines, wherein the fuel gas supply apparatus is configured to supply fuel gas and distribute the fuel gas to the N turbine engines as gaseous fuel; and a fuel liquid supply apparatus connected to at least one of the N turbine engines and configured to supply liquid fuel to at least one of the N turbine engines in a case that at least one of a flow rate and a pressure of the fuel gas decreases.

Abstract: An operation method of a turbine fracturing device and a turbine fracturing device are provided. The turbine fracturing device includes a turbine engine, a speed reducer, a brake mechanism, and a fracturing pump, the method includes: driving, by the turbine engine, the fracturing pump to perform a fracturing operation through the speed reducer so as to keep the fracturing pump in an operating state, the fracturing pump being configured to suck fluid of a first pressure and discharge fluid of a second pressure, the second pressure being greater than the first pressure; and in response to an idling instruction, the turbine engine entering an idling state and triggering a brake operation so as to keep the fracturing pump in a non-operating state.

Abstract: A turbine fracturing system and a controlling method thereof, a controlling apparatus and a storage medium are provided. The turbine fracturing system includes: N turbine fracturing apparatuses, wherein each of the N turbine fracturing apparatuses comprises a turbine engine, and N is an integer greater than or equal to 2; a fuel gas supply apparatus connected to the N turbine engines, wherein the fuel gas supply apparatus is configured to supply fuel gas and distribute the fuel gas to the N turbine engines as gaseous fuel; and a fuel liquid supply apparatus connected to at least one of the N turbine engines and configured to supply liquid fuel to at least one of the N turbine engines in a case that at least one of a flow rate and a pressure of the fuel gas decreases.

Abstract: An operation method of a turbine fracturing device and a turbine fracturing device are provided. The turbine fracturing device includes a turbine engine, a speed reducer, a brake mechanism, and a fracturing pump, the method includes: driving, by the turbine engine, the fracturing pump to perform a fracturing operation through the speed reducer so as to keep the fracturing pump in an operating state, the fracturing pump being configured to suck fluid of a first pressure and discharge fluid of a second pressure, the second pressure being greater than the first pressure; and in response to an idling instruction, the turbine engine entering an idling state and triggering a brake operation so as to keep the fracturing pump in a non-operating state.

Abstract: An in vitro diagnostic analyzer and a reagent card. The reagent card includes a reagent card body and a mounting body. The mounting body includes a mounting hole configured to be sleeved on receive a sample tube, a hollow needle disposed in the mounting hole, a sealing portion disposed in the mounting hole, and a gas inlet channel. An end of the hollow needle is capable of being inserted into the sample tube. The sealing portion is capable of being in sealing fit with an outer wall of the sample tube. The gas inlet channel includes a gas outlet hole, a gas inlet hole, and a first flow-stopping structure. The gas inlet hole is disposed in a surface of the reagent card body. The first flow-stopping structure is disposed between the gas outlet hole and the gas inlet hole. The gas outlet hole is configured to be in fluid communication with the sample tube mounted on the mounting hole. The reagent card body includes a sample feeding channel, a test chamber, and a venting end.

Abstract: An in-vitro diagnostic analyzer, a reagent card (10), and an installation structure (200) are disclosed. The installation structure (200) includes an installation body (210). The installation body (210) includes an installation hole (212) configured to sleeve a sample tube (70), a hollow needle (220), a sealing portion (240), and an air inlet channel (230). One end of the hollow needle (220) is capable of being inserted into the sample tube (70). The sealing portion (240) is in sealing fit with an outer wall of the sample tube (70). The air inlet channel (230) includes an air outlet hole (234) and an air inlet hole (232). The air outlet hole (234) is configured for communication with the sample tube (70) provided on the installation hole (212). The reagent card (10) is integrated with the installation structure (200), and the in-vitro diagnostic analyzer is integrated with the reagent card (10).

Abstract: An operation method of a turbine fracturing device and a turbine fracturing device are provided. The turbine fracturing device includes a turbine engine, a speed reducer, a brake mechanism, and a fracturing pump, the method includes: driving, by the turbine engine, the fracturing pump to perform a fracturing operation through the speed reducer so as to keep the fracturing pump in an operating state, the fracturing pump being configured to suck fluid of a first pressure and discharge fluid of a second pressure, the second pressure being greater than the first pressure; and in response to an idling instruction, the turbine engine entering an idling state and triggering a brake operation so as to keep the fracturing pump in a non-operating state.

Abstract: An operation method of a turbine fracturing device and a turbine fracturing device are provided. The turbine fracturing device includes a turbine engine, a speed reducer, a brake mechanism, and a fracturing pump, the method includes: driving, by the turbine engine, the fracturing pump to perform a fracturing operation through the speed reducer so as to keep the fracturing pump in an operating state, the fracturing pump being configured to suck fluid of a first pressure and discharge fluid of a second pressure, the second pressure being greater than the first pressure; and in response to an idling instruction, the turbine engine entering an idling state and triggering a brake operation so as to keep the fracturing pump in a non-operating state.

Abstract: An operation method of a turbine fracturing device and a turbine fracturing device are provided. The turbine fracturing device includes a turbine engine, a speed reducer, a brake mechanism, and a fracturing pump, the method includes: driving, by the turbine engine, the fracturing pump to perform a fracturing operation through the speed reducer so as to keep the fracturing pump in an operating state, the fracturing pump being configured to suck fluid of a first pressure and discharge fluid of a second pressure, the second pressure being greater than the first pressure; and in response to an idling instruction, the turbine engine entering an idling state and triggering a brake operation so as to keep the fracturing pump in a non-operating state.

Abstract: A turbine fracturing system and a controlling method thereof, a controlling apparatus and a storage medium are provided. The turbine fracturing system includes: N turbine fracturing apparatuses, wherein each of the N turbine fracturing apparatuses comprises a turbine engine, and N is an integer greater than or equal to 2; a fuel gas supply apparatus connected to the N turbine engines, wherein the fuel gas supply apparatus is configured to supply fuel gas and distribute the fuel gas to the N turbine engines as gaseous fuel; and a fuel liquid supply apparatus connected to at least one of the N turbine engines and configured to supply liquid fuel to at least one of the N turbine engines in a case that at least one of a flow rate and a pressure of the fuel gas decreases.

Abstract: Disclosed is an air a gas source system for supplying air gas to a turbine engine by fracturing manifold equipment, including an air a gas supply device, an air gas delivery manifold, a filtering device, a gas detecting system and a connecting device, the air gas delivery manifold, the filtering device and the gas detecting system are integrated on the fracturing manifold equipment, the air gas supply device is connected to the air gas delivery manifold through the filtering device, and the air gas delivery manifold supplies air gas to the turbine engine through the connecting device. Beneficial effects: avoiding the hidden danger of the high pressure region, saving the floor space, avoiding the wiring of on-site delivery manifold, enhancing the connection efficiency, and reducing the difficulty of wellsite installation.