9results about How to "Avoid temperature drift" patented technology

This invention discloses an automatic safety inspection device for central air conditioning outdoor units, belonging to the field of air conditioning outdoor unit detection technology. It includes: a handheld support assembly comprising a support plate and a handheld lever fixed to the side wall of the support plate, with a display host fixedly mounted on the handheld lever; and an external insulation assembly comprising an insulation side plate fixedly mounted on the support plate, with an external insulation cover fixedly connected to the side of the insulation side plate away from the handheld lever, the side of the external insulation cover away from the insulation side plate being open. By setting up the external insulation assembly, internal insulation assembly, and shrinkage adjustment assembly, when using this safety inspection device for inspection, the vent is sealed to form a closed insulation cavity in low-temperature environments, and the vent is opened to allow air circulation, reducing the internal temperature. This reduces the temperature drift of the Hall current sensor due to the influence of the operating environment temperature, improves detection accuracy, and thus helps to improve the accuracy of leakage safety detection of central air conditioning outdoor units.

The invention relates to the technical field of wind power generation equipment, in particular to a shafting torque sensor suitable for a wind driven generator, which comprises a main shell and sealing side plates fixedly mounted on two sides of the main shell, and a static power supply coil is fixedly arranged in the main shell; according to the invention, friction waste heat generated in the operation of the bearing is recovered through an efficient heat pipe system, and is directionally transmitted to the rotating end signal processing module, so that a stable heat source is provided for the rotating end signal processing module in a low-temperature environment; the industrial problems that a fan sensor in an extremely cold area is difficult to start and the precision is reduced are solved, self-circulation utilization of energy is achieved, through the design of the structure of the rotating outer ring cooling cavity and the static flow deflector, strong turbulent flow is generated in the cooling cavity, the efficiency of transmitting bearing friction heat to cooling liquid is greatly improved, and local overheating is avoided. The heat pipes are used, so that efficient, long-distance and directional transmission of heat is achieved.

The invention discloses a thick-film resistor with high strain sensitivity and low temperature sensitivity and a preparation method thereof, and belongs to the technical field of functional materials, electronic elements and sensors. The preparation problem of the thick-film resistor with high strain sensitivity and low resistance temperature coefficient is solved. The preparation method comprises the following steps: weighing lead oxide, boron oxide and silicon dioxide, uniformly mixing, completely melting into molten glass, carrying out water quenching, and carrying out ball milling on the water-quenched glass slag to obtain lead borosilicate glass powder; weighing RuO powder and lead borosilicate glass powder, adding an organic carrier, mixing, adding into a three-roller grinder, and fully grinding to be fine and uniform, so as to obtain resistance paste; and coating a cleaned substrate with the resistance paste in a silk-screen printing manner, and in an air atmosphere, controlling the sintering peak temperature within the range of 750-950 DEG C and the heat preservation time of the sintering peak temperature within the range of 10-360 minutes to obtain the thick-film resistor with both high strain sensitivity and low temperature sensitivity.

The invention belongs to the technical field of medical breathing support equipment, and discloses a breathing machine gas path system and a use method, the system comprises an air input channel, an oxygen input channel, an air-oxygen mixing device and a controller; one end of the air-oxygen mixing device is provided with an air mixing inlet and an oxygen mixing inlet, and the other end is connected with a mixing output pipeline; the oxygen mixing inlet is connected with a Venturi tube arranged in the air-oxygen mixing device; the mixed output pipeline is connected with an anti-suffocation valve through a pipeline, the other end of the anti-suffocation valve is connected with a breathing connector through a pipeline, and the pipeline for connecting the anti-suffocation valve and the breathing connector is connected with an anti-suffocation exhaust port through a bypass; a first two-position three-way normally-closed valve is connected to the pipeline connecting the anti-suffocation valve and the mixed output pipeline through a bypass. The two-position three-way normally-closed valves are combined with the air-oxygen mixing cavity, so that air path modularization and standardization are achieved, the system structure is remarkably simplified, and the number of parts and connectors is reduced.

The utility model relates to low temperature drift long -delay power -on power -off time sequence circuit, it includes a plurality of power -on power -off time sequence unit using parallel architecture, power -on power -off time sequence unit includes power -on channel, power -off channel, comparator and control signal, power -off channel electricity connects external enable control module, power -on channel, power -off channel parallel access comparator negative input, comparator positive input accesses reference circuit, comparator output end connects corresponding control signal, the utility model discloses reasonable in design, compact structure and convenient to use.

The application discloses a digital power distribution automation terminal, which comprises a cabinet, at least one main control unit arranged in the cabinet, a main control board, a microprocessor, a data storage and a clock chip, at least one analog quantity acquisition unit, a telemetry board, a voltage transformer, a current transformer, a filter circuit and an analog-digital converter, at least one switch quantity input unit, a remote signaling board, an optical-electric isolator, an overvoltage protection circuit and a data buffer, compared with the prior art, the problems of poor anti-interference, single communication and power failure of the traditional terminal are solved, and the reliability and field adaptability of the power distribution network operation are improved.

This invention relates to the field of magnetic levitation chiller technology and discloses an energy-saving variable frequency magnetic levitation chiller, including an evaporator, a condenser installed at the bottom of the evaporator, a connecting seat fixedly mounted at the end of the condenser, and a flow guiding component on the outer wall of the connecting seat. This energy-saving variable frequency magnetic levitation chiller recovers waste heat from the condenser cooling water to perform closed-loop constant temperature control on the magnetic levitation bearing, ensuring the bearing remains within its optimal operating temperature range. This avoids coil resistance drift, sensor temperature drift, and fluctuations in levitation stiffness under low-temperature conditions, improving the operational stability of the magnetic levitation bearing. Utilizing the residual heat of the heated cooling water for constant temperature treatment of the magnetic levitation bearing eliminates the need for additional electrical energy consumption for preheating and insulation. Building upon the inherent high efficiency and energy saving of magnetic levitation technology, this further reduces auxiliary energy consumption and improves overall energy efficiency.

The invention relates to the technical field of laser application, and discloses a laser optical path thermal drift compensation device based on a TEC and a piezoelectric module, and the device comprises a negative electrode, a semiconductor laser chip, a positive electrode, a thermoelectric refrigerating unit, a ceramic chip, a lens, a telescopic and deformable piezoelectric module, and a fixed pedestal. The system further comprises a control module, a light path detection sensor, a high-voltage driving circuit, a position sensor and a temperature sensor. A dual active compensation mechanism is adopted, and cooperative control is carried out on two thermal deformation sources of a laser and a lens at the same time: a thermoelectric refrigerating unit is responsible for stabilizing a laser source and fundamentally inhibiting temperature drift; the piezoelectric module dynamically compensates lens side deformation, the comprehensive stability performance of the system is remarkably improved, and the compensation effect is remarkably superior to that of a single means. The temperature control precision of the thermoelectric refrigerating unit can reach + / -0.1 DEG C, the piezoelectric module has nanoscale resolution and millisecond response speed, thermal deformation can be tracked and counteracted in real time, and long-term stability of an optical path is ensured.