17 results about "Frost" patented technology

The invention relates to a defrosting control method based on the opening degree of an electronic expansion valve. The method comprises the steps that the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition or the proportional relation between the reduction value and the opening degree of the electronic expansion valve under the non-frosting normal operation condition is taken as the condition for judging a defrosting starting action; when the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition reaches or exceeds the set difference value K, or the proportion between the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition and the opening degree of the electronic expansion valve under the non-frosting normal operation condition reaches or exceeds the set proportional value L, it is determined that the necessary condition or the necessary and sufficient condition of the defrosting starting action is met. The defrosting control method can more accurately and more timely judge whether an evaporator frosts or not and judge the frosting degree, so that the defrosting action is started accurately and timely, and normal and efficient operation of a heat pump system is ensured.

An alternating type heat pump has first to third rows of outdoor unit coils adapted to selectively perform the functions of an evaporator and a condenser in accordance with the outdoor conditions and the load variations, thereby improving the performance of the heat pump, and is capable of allowing the first to third rows of outdoor unit coils to be operated as a condenser in an alternating manner under the conditions where frost on the outdoor unit coils may be formed especially in winter seasons, thereby basically preventing the conditions on which the frost is formed.

The invention belongs to the technical field of road sheet material processing, and provides a baking-free pavior brick and a preparation method thereof. The baking-free pavior brick comprises the following components: 10-15 parts of fly ash, 30-47 parts of waste potter's clay, 6.5-9.2 parts of silicon powder, 2-6 parts of sodium meta aluminate, 4-9 parts of air floatation algae slag, 0.03-2.7 parts of a binder, and 0.02-0.18 parts of a gallant. The pavior brick is produced by preparing a blank material, moulding a base substrate and preparing the product. The method adjusts a formula of the pavior brick, fly ash, waste potter's clay, zinc powder, sodium meta aluminate, the air floatation algae slag, the binder and the gellant are combined for substituting the cement, and the prepared pavior brick has strong frost resistance and intensity. The production method has convenient operation, the compressive strength of the produced pavior brick can reach as high as 35 MPa, the frost resistance is strong, the waste materials can be used with a maximum degree, the roasting is not required, the energy is saved, the air pollution is reduced, and the method is worth of popularization.

The invention relates to the preparation of an ultra-hydrophobic surface, in particular to a method for preparing an aluminum-based ultra-hydrophobic surface with the condensing droplet self-bouncingcharacteristic. A washed aluminum substrate is subjected to anodic oxidation treatment in electrolyte, removed out, soaked in excessive ethanol solution containing perfluorinated silane, removed again, and then heated, and after cooling, the aluminum-based ultra-hydrophobic surface with the condensing droplet self-bouncing characteristic can be obtained on the aluminum substrate. The method is simple and easy to operate, does not require expensive equipment, has high processing efficiency, and has no environmental harm in the reagents used, the prepared ultra-hydrophobic surface is expected tobe used in the fields such as metal anti-corrosion, anti-frost, anti-ice, enhanced condensation heat transfer and self cleaning.

The invention belongs to the technical field of air conditioners and particularly relates to a defrosting control method for an air conditioner. In order to improve the defrosting efficiency of the air conditioner, the method comprises the following steps that after the air conditioner enters a defrosting mode, an outdoor fan is controlled to reversely operate for time T every set time, wherein amethod for determining the time T comprises the following steps that an external environment temperature and an external coil pipe temperature are detected; the external coil pipe temperature is compared with a dew point temperature; and based on the external environment temperature, according to a comparison result, the time T is determined. According to the defrosting control method, after partof frost is melted each time, the reverse blowing effect of the outdoor fan is used for quickly blowing down a frost layer, and accordingly the defrosting efficiency is improved. The dual-judgement standard for the external environment temperature and the difference value between the external coil pipe temperature and the dew point temperature is used for controlling the time of reverse operationof the outdoor fan, so that the time of reverse operation of the fan each time is more precisely controlled, the melted frost layer is more accurately and efficiently blown down, and the defrosting efficiency of the air conditioner is greatly improved.

The invention relates to a konjak film-covering in-situ winter storage method before first frost. The method comprises the following steps: selecting a lotin whichbiennial plants which are not dug in this autumn are planted; after konjak sprouts tumble, picking all the konjak haulms in the lot, removing weeds, covering soil on the pedicle openings left after konjak lodging, leveling the original ridge surface soil, and covering a film on the ridge surface, wherein the ridge is 20-30cm high. The in-situ storage mode is adopted to ensure the underground bulbs of konjak to live through the winter safely.

The invention discloses a fruit tree protecting umbrella. The fruit tree protecting umbrella is used for protecting fruit trees from frost, hail and rain water. The fruit tree protecting umbrella comprises a circular gas bag, wherein the internal cavity of the gas bag is charged with hydrogen gas through a gas tap so as to enable the gas bag to be umbrella-shaped, and ventilation holes are formed in the middle part of the gas bag.

The invention discloses a boron-containing barium-rich sulphoaluminate cement clinker with negative temperature resistance and anti-radiation performance. The cement clinker comprises the following minerals by weight percentage: 48-62% of Ba-bearing calcium sulphoaluminate, 5-12% of dicalcium ferrite, 20-26% of dicalcium silicate, 8-15% of barium aluminate and 3-8% of calcium borate. The cement clinker provided by the invention has high strength, good durability, high compactness, low dry shrinkage rate, good anti-radiation performance and excellent frost resistance, and is suitable for the construction of nuclear power engineering structures such as a containment building, a shielded factory building, an auxiliary building and the like, which are likely to be damaged by freeze thawing incold highland regions such as world poles, northern China and the like.

The invention discloses a multifunctional water collection pipeline for the saline and alkaline land in the technical field of saline and alkaline land improvement. The multifunctional water collection pipeline comprises a water pipe, the outer wall of the water pipe is sleeved with a protection sleeve, closed pipe connecting joints are evenly arranged on the top of the water pipe, a closed bolt is arranged at the right end of the water pipe, and the multifunctional water collection pipeline for the saline and alkaline land is simple in structure and reasonable in arrangement, a saline and alkaline neutralizing device is adopted, saline and alkaline dirt deposited in the water pipe can be diluted and removed, a teflon sliding assisting layer is adopted, a friction coefficient between the water pipe and a water pipe groove is reduced, and during pipe arranging of the water pipe, consigning is convenient; a glass silk polyethylene cold-proof layer is adopted, water pipe frost cracking can be prevented, a vinylidene chloride resin layer can prevent the water pipe from being corroded, multiple sets of closed pipe connecting joints are adopted to connect closed pipes with the water pipe, one water pipe can be connected with the multiple closed pipes, the traditional connection manner through a tee-joint pipe can be solved, and defect of material waste is reduced.