59results about How to "Easy to return oil" patented technology

The invention relates to a novel laser welding piston with a forged steel structure. The piston comprises a forged piston ring body and a piston body, wherein the piston ring body and the piston body are welded by laser; a closed cooling oil chamber is formed between the piston ring body and the piston body and is communicated with the external through an oil inlet hole and an oil outlet hole; the lower part of the piston ring body is provided with an oil ring groove; the piston body corresponding to the position of the oil ring groove is provided with an annular groove; a girdle band is arranged between the oil ring groove and the annular groove; the girdle band is provided with a plurality of oil return holes communicating the oil ring groove and the annular groove; or the lower side of the oil ring groove is provided with a plurality of level oil return blind holes. The piston reduces weight of the piston, and increases flexibility of the piston body; and the oil return holes or the level oil return blind holes are favorable for back flow of machine oil of the oil ring groove, particularly the machine oil at the bottom of the oil ring groove so as to prevent the spilling of the machine oil caused by high pressure of the machine oil, and contribute to reducing machine oil consumption and harmful emissions of motors.

The invention discloses a parallel system of multiple high-pressure cavity compressors. Due to the design of an inverse U-shaped pipe, an overflow pipe and an oblique main pipe, the refrigerating machine oil reflowing from an oil separator is prevented from flowing back to compressors when all the compressors stop running, and more oil reflowing from the oil separator can be stored in a vapor-liquid separator through the overflow pipe so as to prevent liquid blockage; when the compressors run in low loads and the coolant flow rate of an air suction pipe is low, the oil can be prevented from flowing back to the vapor-liquid separator; after a certain oil quantity is accumulated in the oblique main pipe, the oil is directly recycled to the compressors, so that the oil supply of the compressors is ensured; and the system can avoid liquid compression or liquid blockage of the compressors in each state of the compressors, so that the reliability of the compressor is improved.

The invention discloses a ball crusher with a double-rotor hydrostatic bearing structure, which comprises a frame and a lower grinding disc. The lower grinding disc comprises an inner disc, an inner disc spindle, an outer disc, an outer disc spindle and an outer disc spindle bearing block fixed on the frame. The inner disc spindle is fixedly connected with the inner disc. The outer disc spindle is fixedly connected with the outer disc. The inner disc is sleeved in the outer disc. The inner disc spindle is sleeved in the outer disc spindle. The outer disc spindle is sleeved in the outer disc spindle bearing block. An inner disc liquid hydrostatic bearing is arranged between the inner disc spindle and the outer disc spindle. An outer disc liquid hydrostatic bearing is arranged between the outer disc spindle and the outer disc spindle bearing block. The ball crusher with the double-rotor hydrostatic bearing structure has the advantages of high rotary precision and simple and compact structure, is very suitable for precise and ultraprecise grinding machining and is convenient to disassemble and assemble.

The invention relates to a lubricating oil return mode of a supercharger of a turbocharged engine, and aims to lubricate the supercharger. An oil return channel A which accords with the cold operating condition of an engine, an oil return channel B which accords with the normal operating condition of the engine, oil return channels C and D which accord with the operating condition of the engine in high temperature environment, and a supercharger oil return control valve are arranged on a cylinder body of the engine, so that oil return lines of lubricating oil in the supercharger of the engine in different operating states are cyclically switched. The operating efficiency of the engine is improved; the high temperature characteristic of the lubricating oil in the supercharger is reasonably utilized, so that the heat balance of the engine is realized; and meanwhile, the oil return performance of the supercharger of the engine is improved, the probability that the oil in the supercharger leaks is reduced, and the power performance and economy of the engine are effectively improved.

The invention discloses a liquid accumulator which comprises a shell, an air inlet pipe, an air outlet pipe and at least one separating device. The air inlet pipe and the air outlet pipe are arranged on the shell in a spaced mode, the air inlet pipe and the air outlet pipe are both communicated with the interior of the shell, and the separating device is arranged in the shell and is located between the air inlet pipe and the air outlet pipe so as to conduct air and liquid separation on a air-liquid refrigerant mixture entering the shell from the air inlet pipe. According to the liquid accumulator, the separating device is arranged in the liquid accumulator, the separating device can conduct air and liquid separation on the air-liquid refrigerant mixture entering the liquid accumulator, and therefore the air-liquid refrigerant mixture in the liquid accumulator at least passes through two-time air-liquid separation, the number of liquid refrigerants absorbed by a compressor is reduced, and the reliability of the compressor is improved.

The invention discloses a trans-critical carbon dioxide refrigeration method and a device thereof. The method comprises the following steps that (1) superheated carbon dioxide steam is pressurized forprimary compression and primary cooling; (2) subcritical carbon dioxide is subjected to secondary compression and secondary cooling; (3) after supercritical carbon dioxide is cooled again, the supercritical carbon dioxide is throttled to be low-temperature subcritical carbon dioxide; (4) the throttled low-temperature subcritical carbon dioxide is sent to an evaporation tank to be evaporated intohigh-temperature low-pressure carbon dioxide gas; and (5) the high-temperature low-pressure carbon dioxide gas absorbs heat and then is converted into superheated carbon dioxide steam, and is fed intoa first compressor for boosting for cyclic utilization. According to the trans-critical carbon dioxide refrigeration method and the device thereof, an expansion machine is used for recycling and outputting mechanical energy to drive a compressor to complete compression, a double-compressor is used for improving the compression performance of the supercritical carbon dioxide, and a double-gas cooler and an internal regenerator are used for cooling the carbon dioxide gas so as to improve the cycle energy efficiency of the carbon dioxide.

The invention discloses a control method and device for electronic expansion valves of multiple chambers of a refrigerating system and the refrigerating system. The control method comprises the following steps that 1, the running state of a compressor, the opening degree of the electronic expansion valves arranged in a thermal bypass and the actual temperature of each chamber are obtained, wherein each chamber is provided with a corresponding preset target temperature; 2, according to the actual temperature of each chamber, the temperature difference between the actual temperature of each chamber and the corresponding preset target temperature is determined; and 3, according to the running state of the compressor, the temperature difference and the current opening values of the electronic expansion valves which correspond to the chambers and are arranged in the thermal bypass, the opening values of the electronic expansion valves which correspond to the chambers and are arranged in the thermal bypass are controlled to be increased to a first preset value or decreased to a second preset value. According to the control method and device for the electronic expansion valves of the multiple chambers of the refrigerating system and the refrigerating system, heating output can be reduced, the purpose of saving energy is achieved, oil return of the compressor is easy, and the compressor is protected.

The invention provides an expansion switch valve which comprises a valve body. An inlet, a first outlet, a second outlet and an inner runner communicating among the inlet, the first outlet and the second outlet are formed in the valve body. The inner runner is provided with a first valve element (503) and a second valve element (504), the inlet and the first outlet communicate directly or are isolated through the first valve element (503), and the inlet and the second outlet communicate through a throttling hole (505) or are isolated through the second valve element (504). Thus, by integrallyinstalling the first valve element and the second valve element on the inner runner of the same valve body, the refrigerant circulation and cut-off control and/or throttling expansion control functioncan be achieved, the structure is simple, and production and installation are easy; and when the expansion switch valve provided by the invention is applied to a heat pump system, pipe connection canbe simplified, the cost is reduced, the refrigerant filling amount of the whole heat pump system is reduced, and oil return of a compressor is facilitated.

The invention provides a variable frequency air conditioner control method and device, an air conditioner and a storage medium. The variable frequency air conditioner control method comprises the steps that a variable frequency air conditioner is controlled to increase frequency according to a preset frequency increasing mode; and before the frequency of the variable frequency air conditioner reaches the target frequency or within the preset duration after the frequency rising starting moment of the variable frequency air conditioner, the opening degree of an electronic expansion valve of thevariable frequency air conditioner is controlled to be larger than the preset opening degree, and/or the rotating speed of a draught fan in an indoor unit of the variable frequency air conditioner iscontrolled to be larger than the preset rotating speed. The air return temperature can be effectively increased, oil return is optimized, and the oil return performance of the compressor is improved.

The invention discloses a sector static pressure rotary work table and a gear cutting machine. A big friction wheel (5) of the sector static pressure rotary work table is fixed on the upper end face of a sliding table (1), a pressing plate (2) is arranged between the sliding table (1) and the big friction wheel (5), the pressing plate (2) is fixed on the lower end face of a workpiece box body (4), an upper friction pair surface is formed between the upper end face of the pressing plate (2) and the big friction wheel (5), a lower friction pair surface is formed between the lower end face of the pressing plate (2) and the sliding table (1), an upper oil cavity (2-1) and a lower oil cavity (2-2) are arranged on the upper friction pair surface and the lower friction pair surface respectively, and the area of the lower oil cavity (2-2) is larger than that of the upper oil cavity (2-1). The big friction wheel of the rotary work table is free of abrasion during operation, stable in movement, good in rigidity, high in precision, simple and reasonable in structure, easy to machine and manufacture and convenient during oil return and can effectively guarantee the whole machine cutting precision of the gear cutting machine.

The invention provides an expansion switch valve. The expansion switch valve comprises a valve body (500), wherein an inlet (501), an outlet (502) and an inner flow passage communicating between the inlet and the outlet are formed in the valve body (500), a first valve element (503) and a second valve element (504) which are parallel to each other are installed on the inner flow passage, and the first valve element (503) enables the inlet and the outlet to directly communicate or be disconnected; and the second valve element (504) enables the inlet and the outlet to communicate or be disconnected through a throttling hole (505). In this way, the first valve element and the second valve element are integrally installed on the inner flow passage of the same valve body, so that the on-off control function or the throttling expansion control function of a refrigerant can be realized, the structure is simple, and the production and the installation are easy. When the expansion switch valveis applied to a heat pump system, the pipeline connection can be simplified, the cost can be reduced, the refrigerant filling amount of the whole heat pump system is reduced, and the oil return of a compressor is facilitated.

The invention relates to a labyrinth seal with an oil scraping structure and an oil scraping method. The labyrinth seal comprises a dynamic ring which is fixed on a gear and a static ring which is fixed on a gear shield; the dynamic ring is accommodated in the static ring; at least one oil scraping plate which is resisted against the surface of the dynamic ring is arranged on one side inner wall of the static ring; and the oil scraping plate is used for scraping lubrication oil which flows into a dynamic gear socket from a gear edge into an oil storage tank which is arranged below the gear shield. According to the labyrinth seal with the oil scraping structure, the oil scraping plate which is resisted against the dynamic ring is arranged on one side inner wall of the static ring; when thedynamic ring rotates along with the gear, the oil scraping plate scrapes lubrication oil between the dynamic ring and the static ring into the oil storage tank which is arranged below the gear shield;and in a heavy-load high-stickness lubrication medium working condition, the labyrinth seal also has good sealing performance when being applied to a main shaft gear stand, and the lubrication oil iseffectively prevented from being leaked out of the main shaft gear stand.

The invention relates to the field of engine parts, in particular to a supercharged gasoline direct-injection engine piston ring set. The supercharged gasoline direct-injection engine piston ring set comprises a first air ring, a second air ring and an oil ring closure part, wherein the cross section of the first air ring is in a shape of a cylindrical ring, the cross section of the second air ring is in a shape of a nose-shaped conical-surface ring, and oil return holes formed in a ciruclar ring of the oil ring closure part are in shapes of elongated holes. The closure gap D of the second air ring is 0.5-0.65 mm. Ten oil return holes of the oil ring closure part are evenly distributed in the circular ring, and the area of each oil return hole is 7 square milimeters. An oil scraping blade of the oil ring closure part is plated with chromium, and the surface of a circular ring body of the oil ring closure part is subjected to parkerizing treatment. The abrasion-resisting performance of the piston ring set is improved by 2-3 times, and the abrasion degree of a cast iron cylinder hole is reduced by 2-3 times. The frictional power consumption of the piston rings is reduced, so that the fuel consumption of an engine is reduced. The supercharged gasoline direct-injection engine piston ring set has very good oil return and self-cleaning capacities.

The invention discloses an air conditioning system with a pressure relief function. The air conditioning system comprises a compressor, a condenser, an expansion valve, an evaporator and a gas-liquid separator. A pressure relief branch is arranged between an inlet pipe of the condenser and an inlet pipe of the evaporator, an electromagnetic valve is serially connected in the pressure relief branch, and turning on and turning off of the electromagnetic valve are staggered and synchronized with turning on and turning off of the compressor. Since the pressure relief branch is arranged between the inlet pipe of the condenser and the inlet pipe of the evaporator, a high-pressure refrigerant in the condenser can be quickly released into low-pressure refrigerant of the evaporator, pressure balance of a refrigerating system is quickly established, and pressure difference is prevented from existing in the system when the compressor is started again; meanwhile, diameter of the pressure relief branch is large, so that oil return of the refrigerating system is well guaranteed, and heat exchange effect of the system is improved; moreover, a pressure sensor is further arranged at the position of the electromagnetic valve, pressure relief information can be fed back to an air conditioning control system by the pressure sensor, and accordingly convenience is brought to the control system to adjust states of an air conditioner.

The invention discloses a functional moon cake containing astaxanthin. The moon cake comprises cake skin and cake filling, the cake skin wraps the cake filling, the main material of the cake skin is prepared from, by weight, 60-75 parts of plant powder, 3-5 parts of edible oil and fat, 1-2 parts of honey and 10-15 parts of egg white, and the main material of the cake filling is prepared from, by weight, 20-30 parts of plant powder, 4-6 parts of edible oil and fat, 4-6 parts of high fructose syrup, 5-8 parts of egg white, 60-75 parts of main filling and 1-5 parts of astaxanthin. The invention further provides a preparation method of the functional moon cake containing astaxanthin. According to the functional moon cake containing astaxanthin, by adding astaxanthin, the health care treatmenteffect is achieved, the oxidation resistance is conveniently improved, tumors and cancers can be resisted, and the immunity and vision are improved; honey and egg white are added to the cake filling,high fructose syrup and egg yolk are added to the cake filling, the flavor of the moon cake is sweeter, the exterior of the moon cake is crispy, the interior of the moon cake is soft, and the food therapy effect of the moon cake is improved.

The invention relates to a fire-protection fire-extinguishing device and discloses a low-pressure carbon dioxide extinguishing agent storage device, comprising a built-in evaporator. The low-pressure carbon dioxide extinguishing agent storage device is characterized in that the evaporator comprises a shunt, a collecting pipe and a plurality of groups of snakelike coils which are connected in parallel between the shunt and the collecting pipe and are vertically arranged. For the device, the structure of the built-in evaporator is reasonable, the pressure loss is small, the installation is simple and the cold exchange efficiency is high.