31results about How to "Avoid repeated start and stop" patented technology

The invention discloses an intrinsically safe inerting protection method and an intrinsically safe inerting protection device for an oil storage tank, relates to a method and a device for active fire and explosion prevention of the oil storage tank, and aims to solve the problem of fire and explosion prevention of the oil storage tank. The method comprises the following steps: a, performing inerting on each oil tank in sequence to ensure that each oil tank achieves an inexplosive condition, namely, the oxygen concentration of gas in the tank is lower than 10 percent; b, detecting the pressure of a pipe network for supplying inert gas to the oil tank, and supplying the inert gas to the pipe network and inputting the inert gas to the oil tank through the pipe network if the pressure is lower than a set lower limit value; c, detecting the pressure of the pipe network for supplying the inert gas to the oil tank, emitting the inert gas in the pipe network if the pressure exceeds a set upper limit value; and d, detecting the oxygen concentration in the pipe network for supplying the inert gas to the oil tank, and repeating the step a if the concentration exceeds the set upper limit value. The device comprises a buffer device, an inlet end of which is to receive the inert gas, and an outlet end of which is connected to a breathing pipe network through a control valve; a first pressure transmitter mounted on the buffer device; the breathing pipe network communicated with the oil tank through an intake stop valve; a second pressure transmitter; an online oxygen analyzer mounted on the breathing pipe network; and an electric control device electrically connected to the first pressure transmitter, the second pressure transmitter, the online oxygen analyzer and the control valve.

The invention discloses a control method for a heat pump system, the heat pump system and an air conditioner. The control method for the heat pump system comprises the following steps: judging whether a heat recovery mode is allowed to run according to the temperature of a heat recovery medium which is to be subjected to heat exchange with a refrigerant, and / or, when the heat recovery mode is allowed to run, controlling a compressor in a refrigerant circulating loop to start / stop according to the temperature of the heat recovery medium which is to be subjected to heat exchange with the refrigerant. According to a control method for a heat recovery device, whether the heat recovery mode is allowed to run and whether the compressor is started / stopped are controlled by the temperature of the heat recovery medium. By actively inhibiting the heat recovery device from running or actively stopping the compressor, the running stability of the heat pump system cannot be influenced by excessively high or excessively low temperature of the heat exchange medium, or the phenomenon that the compressor is repeatedly started / stopped is prevented. Not only can the running stability and comfort of the heat pump system be guaranteed, but also the stability of the heat recovery function is ensured, and domestic hot water is provided for users.

This is a water supply method at entire flow rate and high efficient speed adjustment by frequency conversion. Divide the area into different districts in vertical first and figure out lift difference among the districts. Then decide the numbers and total flow rate of pumps in large capacity and small capacity. Set the pump's speed adjustment scopes and start-stop configures and restrict the low limits of pump's high frequency and pressure of pipe networks. The air pressing water supply tank, small capacity pump and large capacity pump are started in order, water flow rate changes from high to low, frequency conversion pumps are closed in order as the manner of large capacity pumps starting, running at decreasing frequency, small capacity pumps starting near to large ones low limitation, both large and small ones stop at reaching their low limitation. This method keeps the pumps working at high efficiency period during all water supply time and avoids repeating start and stop.

The invention discloses an air conditioner control method and device. The air conditioner operates in a cooling mode, and the method includes the following steps: identifying that the compressor in the air conditioner operates at the lowest operating frequency; obtaining indoor temperature and indoor preset temperature; If the indoor temperature is less than the preset temperature, obtain the outdoor temperature; obtain the target inlet temperature of the evaporator according to the outdoor temperature and the indoor temperature; adjust the electronic expansion valve according to the target inlet temperature of the evaporator The opening degree effectively solves the technical problem in the prior art that the output cooling capacity of the air conditioner is greater than the actual indoor cooling capacity when the air conditioner operates at the lowest frequency.

The invention provides a photovoltaic inverter auxiliary power supply and a start-stop control method. The photovoltaic inverter auxiliary power supply is characterized in that an input terminal of a rectification circuit is connected to a power grid connected to an inverter of the photovoltaic inverter auxiliary power supply; an output terminal of the rectification circuit is connected to a first input terminal of a conversion circuit; an output terminal of the conversion circuit is connected to each equipment in the inverter of the photovoltaic inverter auxiliary power supply; a first input terminal of an enable circuit is connected to an output terminal of a photovoltaic assembly; an output terminal of the enable circuit is connected to a first input terminal of a control circuit; an output terminal of the control circuit is connected to a second input terminal of the conversion circuit; and the rectification circuit converts an alternating voltage acquired from the power grid into a direct voltage and outputs the direct voltage to the first input terminal of the conversion circuit. In the invention, by using the photovoltaic inverter auxiliary power supply, a repeated start-stop condition can be avoided when illumination is insufficient so that a condition that the photovoltaic inverter is started and stopped repeatedly because a needed voltage is insufficient is avoided.

The invention relates to the technical field of dust removal, in particular to a dust removal device, an air conditioner and a dust removal method. The air conditioner includes a fan, a heat exchanger, and a dust removal device. The dust removal device includes a dust remover. The dust remover includes a dust removal body, a first piston, and a first elastic member. The dust removal body is provided with a first cavity and a ventilator connected to the first cavity. The air vent is used to let in external air, the injection port is used to eject the gas in the first cavity, and the injection port is set toward the heat exchanger, the first piston is located in the first cavity, and the first elastic member One end is connected with the first piston, and the other end is connected with the inner wall of the first cavity, and the first piston can reciprocate in the first cavity. During dust removal, the receiver receives the dust removal command, and the judge judges whether the air conditioner meets the predetermined dust removal operating conditions; the controller controls the fan to reverse; the dust removal device is used to remove dust from the surface of the heat exchanger of the air conditioner, and the receiver receives the dust removal order when Receive automatically when powered on and / or shut down.

The invention discloses an air conditioner control method and device. The air conditioner operates in a cooling mode. The method includes the following steps: identifying that the compressor in the air conditioner operates at the lowest operating frequency; obtaining the target operating frequency of the air conditioner at the current moment; if If the target operating frequency is less than the minimum operating frequency, obtain the outdoor temperature and indoor temperature; obtain the target inlet temperature of the evaporator according to the outdoor temperature and the indoor temperature; adjust the electronic The opening of the expansion valve effectively solves the technical problem in the prior art that the output cooling capacity of the air conditioner is greater than the actual indoor cooling capacity when the air conditioner operates at the lowest frequency.