43 results about "Freeze stat" patented technology

A method of controlling and enhancing the nucleation of product in a freeze dryer, wherein the product is maintained at a predetermined temperature and pressure in a chamber of the freeze dryer, and a predetermined volume of condensed frost is created on an inner surface of a condenser chamber separate from the product chamber and connected thereto by a vapor port. The condenser chamber has a predetermined pressure that is greater than that of the product chamber. The opening of the vapor port into the product chamber creates gas turbulence that breaks down the condensed frost into ice crystals that rapidly enter the product chamber for even distribution therein to create uniform and rapid nucleation of the product in different areas of the product chamber.

An auxiliary coolant system, for a fuel cell stack system, includes a reversible coolant pump, a control valve, and plumbing lines. The pump enables the reversal of the coolant flow direction in the fuel cell stack system. The auxiliary coolant system is in parallel with the primary coolant system, and communicates with the primary coolant system via valves. During start-up, when coolant flow is from right-to-left through the fuel cell stack system, one valve of the primary coolant system will be partly open and control the amount of cold coolant make-up from the primary coolant system to the fuel cell stack while the valve of the auxiliary coolant system will be controlling the temperature differential between the inlet and outlet of the stack.

The invention provides a freezer-free liquid nitrogen artificial ground freezing method and belongs to the technical field of artificial ground freezing. According to the method, construction drilling, namely primary drilling is carried out at first, and then freezing of a drilled hole and the ground surrounding the drilled hole is carried out by inserting a liquid nitrogen injection pipe into the drilled hole; after muddy water in the drilled hole formed through primary drilling and the surrounding ground are frozen, secondary drilling construction is carried out, a stable channel is formed, and liquid nitrogen is injected continuously to achieve ground freezing; and after the range, temperature and strength of frozen soil meet design requirements, liquid nitrogen injection is stopped, and freezing is completed. According to the method, the characteristics of low temperature and quick freezing of the liquid nitrogen are fully used, the ground is frozen in a forced mode, conditions are provided for secondary drilling dry operation, a natural liquid nitrogen heat exchange space is formed in the ground after secondary drilling, the liquid nitrogen makes direct contact with the soil, and higher heat exchange efficiency and higher freezing speed can be obtained. The links of machining, producing and installing traditional freezers are omitted, material is saved, cost is reduced, and the construction progress is improved.

A device for monitoring a liquid level of a liquid storage tank for a vehicle is capable of improving sensing sensitivity of a liquid level sensor by employing a structure capable of amplifying an electromotive force, which is generated by an electrode, at an electromotive force amplification layer including a carbon micro coil (CMC) and accurately sensing a frozen state of a liquid to perform a heating function so as to resolve the frozen state of the liquid.

The invention discloses a heating control method of a liquid supply pump. The method comprises the following steps: judging the freezing state of the liquid in the liquid supply pump by using an internal temperature sensor of the liquid supply pump; According to the working environment state of the liquid supply pump; calculate the heating mode that the liquid supply pump needs to enter according to the freezing state of the liquid in the liquid supply pump and the working environment of the liquid supply pump; according to the heating mode of the liquid supply pump, use the power supply for the liquid supply pump The voltage calculation is suitable for the defrost control parameters of the liquid supply pump; the diagnosis is made according to the internal temperature rise characteristics of the liquid supply pump. According to the frozen state of the liquid in the liquid supply pump and its environment, the present invention can calculate appropriate control parameters to perform thawing or heat preservation control, so that the liquid supply pump can work stably and reliably in cold environments.

The invention provides an air conditioner anti-freezing method, an air conditioner and a computer readable storage medium. The method comprises the following steps that 1, the current working state ofthe air conditioner is acquired; 2, if the current working state is that when the running duration of the air conditioner entering the refrigerating mode exceeds the first preset time duration, a current preset interval is determined according to the absolute value of the difference value between the real-time preset temperature value and the real-time indoor environment temperature; 3, the inletpressure value of an evaporator is detected; and 4, the entering time and the exiting time of the anti-freezing mode is determined according to the inlet pressure value and the pressure threshold value corresponding to the current preset interval. The air conditioner comprises a controller, and the controller is used for executing the anti-freezing method of the air conditioner when the computerprogram stored in a memory is executed. The computer readable storage medium is stored with the computer program, and when the computer program is executed by the controller, the anti-freezing methodfor the air conditioner is realized. According to the method, the accuracy of controlling the air conditioner to enter the anti-freezing state can be improved.

The invention discloses a microwave vacuum freeze-drying device, which belongs to the field of microwave application technology. The drying chamber communicates with a cold trap through a water-air channel; the cold trap is connected with a vacuum device through a pipeline; The warehouse is connected to the post-transition warehouse through the drying outlet; the drying inlet is equipped with the first electric control door to control the opening and closing of the drying inlet; the drying outlet is equipped with the second electric control door to control the opening and closing of the drying outlet; Conveying device; the front transition chamber is equipped with a material inlet; the material inlet is equipped with a third door; the rear transition chamber is equipped with a material outlet; the material outlet is equipped with a fourth door; the front transition warehouse and the rear transition warehouse are respectively passed through the pipeline Connect the vacuum unit. The microwave vacuum freeze-drying device of the present invention can sublimate the moisture in the material to be dried in the frozen state to realize rapid drying of the material, the material is evenly dried, the loss of components is small, the shape is kept well, and continuous batch processing is possible.

The present invention relates to slip flow for reliable anode-to-cathode flow under freezing conditions. An apparatus and method for ensuring proper fuel cell system warm-up or shutdown during freeze conditions. A three-way valve is used in conjunction with the flow control orifice to ensure that the orifice avoids ice plugging during freezing conditions. Dry hot air is delivered under pressure as a slipstream to the cathode flow channel, where the orifice is configured such that it is structurally compliant so as to facilitate deflection in response to the pressurized slipstream, thereby helping to make possible Any small amount of ice that forms in the mouth or on the orifice breaks up.