32results about How to "Guaranteed hold time" patented technology

An airtightness check method for a refrigeration and freezing device. A sealed space is provided inside a storage compartment of the refrigeration and freezing device; the sealed space is filled with nitrogen to fresh food therein. The check method comprises: measuring nitrogen concentration inside a sealed space (S302); determining a maintaining duration during which the nitrogen concentration inside the sealed space is maintained within a preset range of concentration to be measured (S304); calculating a duration difference between the maintaining duration and a preset statistical duration (S306); if the duration difference is greater than a preset threshold, determining that the airtightness of the sealed space does not satisfy a preset requirement (S310); and if the duration difference is smaller than or equal to the preset threshold, determining that the airtightness of the sealed space satisfies the preset requirement (S312). The check method can determine, on the basis of a duration required for a change in the nitrogen concentration in a sealed space, whether the airtightness of the sealed box satisfies a preset requirement, and can timely find out cases where sealed boxes are not tightly sealed. Also provided is a refrigeration and freezing device.

The invention relates to a quartz heating groove, comprising a quartz groove body and a thermocouple protecting pipe arranged in the quartz groove body, wherein the bottom of the quartz groove body is provided with a liquid discharging port; the quartz heating groove further comprises a heating resistance wire attached at the outer surface of the quartz groove body, a PP (polypropylene) plastic layer arranged at the periphery of the heating resistance wire and a quartz cotton layer filled between the heating resistance wire and the PP plastic layer; and the quartz heating groove further comprises a liquid discharging pipe which penetrates through the PP plastic layer, the quartz cotton layer and the heating resistance wire. In the quartz heating groove, the heat resistance wire is attached at the outer surface of the quartz groove body, and a quartz cotton insulating layer is also arranged at the outer surface of the quartz groove body, so that the insulating effect is good and the insulating time of a chip in the acid pickling process is guaranteed.

A voltage stabilizing circuit with a holding time function, including a three-terminal integrated voltage regulator, an input filter capacitor and a rectifying diode. There is a holding time circuit connected in parallel between the input or output end of the three-terminal integrated voltage regulator and the common ground. The holding time circuit is composed of a charging resistor and a discharging diode connected in parallel and then connected in series with a charging and discharging capacitor for holding time. Two-terminal network, one end of which is the cathode of the discharge diode is connected to the input or output of the three-terminal integrated voltage regulator, the anode of the discharge diode is connected to the positive pole of the charging and discharging capacitor for the holding time, and the other end is the negative pole of the charging and discharging capacitor for the holding time. common connection. Realized the separation of the normal filter capacitor for the voltage stabilizing circuit and the charging and discharging capacitor for the holding time, and the charging and discharging capacitor for the holding time is an arbitrary capacity capacitor to ensure that the output voltage of the voltage stabilizing circuit meets the required holding time, effectively avoiding the power module due to selection The problem of difficult startup caused by large-capacity retention time capacitors.

The invention discloses a method for filling deep cooling container interlayer heat-insulating material, belonging to a method for placing diffluent solid material into a container and a device thereof, the method and the device for placing the solid material into a vacuum container in particular. The invention discloses a new technique in which nitrogen is used to replace air in a filling material storage tank and nitrogen pressure is used to fill heat-insulating material in the deep cooling container interlayer and discloses a specialized device matched with the technique. The bottom part of the filling material storage tank is of a conical structure, which facilitates filling the material. 0.2 MPa of nitrogen is infused into the store tank to prevent air from contacting with the filling material; the method of the invention ensures that in the process of filling, the filling material is not contacted with the air; meanwhile, multi-groups of store tanks can be filled simultaneously,thus filling speed and evenness are ensured; in addition, the method can replace the remaining air in the interlayer, ensuring future maintaining time of high vacuum in the interlayer; the method is simple and feasible and the equipment in the specialized device is easy to be manufactured.