39results about How to "Effective antifreeze" patented technology

The invention discloses a small-bore opposite type ultrasonic flowmeter. The small-bore opposite type ultrasonic flowmeter comprises a circuit box, a pipe section outer layer, a pipe section inner layer and transducer assemblies, wherein the circuit box is arranged on the pipe section outer layer; the pipe section inner layer is integrally formed by injection molding; a transducer mounting seat is formed at an end of the pipe section inner layer; the transducer assemblies are mounted in the mounting seat; the two pairs of transducer assemblies are arranged in pairs; and the pipe section inner layer is mounted in the pipe section outer layer. According to the ultrasonic flowmeter, ultrasonic waves are oppositely transmitted and received, energy loss is low, the pipe section outer layer can be a standard pipe fitting, and therefore, the costs are reduced. By the design of small step-free transducers, the problem that transducers cannot be mounted in small-diameter pipes is solved, pressure loss is reduced, water flows smoothly, and metering is accurate. The pipe section inner layer is assembled conveniently and quickly, is positioned accurately and is good in sealing. A whole cavity does not have water, transducer connecting lines are effectively prevented from being soaked in water, retractable space for deformation of the pipe section inner layer and tiny expansion caused by the reason that water is changed into ice is provided, and freezing is prevented effectively.

The invention discloses an anti-freezing pressure-resistant cable. The anti-freezing pressure-resistant cable comprises a conductor, an insulating layer, a heat conduction layer I, a heating layer, a heat conduction layer II, a shield layer and a sheath. The conductor is externally extruded by the insulating layer. The insulating layer is externally extruded by the heat conduction layer I. The heat conduction layer I is externally extruded by the heating layer. The heating layer is externally extruded by a heat conduction layer II. The heat conduction layer II is externally extruded by the shielding layer. The shielding layer is externally extruded by the sheath. The anti-freezing pressure-resistant cable is simple and reasonable in structure and is effective in freezing resistance.

The low temperature construction method for grouting bridge support in the temperature lower than 10 deg.c, especially lower than 0 deg.c, includes heating the support bed stone in the pier top, pier anchor hole, lower bridge bearing steel plate, screw and sleeve, mortar stirrer, mortar pipe, etc partially or completely, taking heat insulating measures, and heating and maintaining the grouted mortar with heating bag and heat insulating jacket. The present invention has homogeneous heating of the mortar in and after grouting, and can ensure the global strength and antifreeze performance of anchoring mortar.

The invention provides an air conditioner cooling unit and an anti-freezing control method thereof. The air-conditioner cooling unit comprises at least three temperature sensors. The anti-freezing control method comprises collecting the temperatures of the temperature sensors, and when all the temperature sensors break down, entering an anti-freezing mode; if at least one of the collected temperatures is lower than a first temperature threshold, entering the anti-freezing mode; when all the collected temperatures are higher than a second temperature threshold, exiting the anti-freezing mode. According to the air conditioner cooling unit, the water inlet, the water outlet and the inside of the shell tube of a shell-tube heat exchanger are provided with the temperature sensor, so that anti-freezing failure due to drifting or fault of certain temperature sensors can be avoided, effective anti-freezing effects on the shell-tube heat exchanger can be achieved, and the reliability of the shell-tube heat exchanger of the air conditioner cooling unit can be improved.

The invention provides anti-crack and anti-freeze concrete and a preparation method thereof. The preparation method comprises the following steps: (A) mixing sodium gluconate, sodium dodecyl benzene sulfonate, a water reducing agent, soluble inorganic salt, methyl alcohol and water, so as to prepare M1; (B) crushing aggregates into particles with a particle size less than 20 mm; (C) under a stirring condition, mixing and stirring the M1, the crushed aggregates, cement, coal ash, fiber and water to prepare the anti-crack and anti-freeze concrete. The problem of relatively low building quality due to phenomena of frozen cracks of the concrete under a relatively low temperature condition and the like is solved.