36results about How to "Improve isentropic efficiency" patented technology

A refrigerant system is provided with at least two sequential stages of compression. An intercooler is positioned intermediate the two stages. The refrigerant flowing through the intercooler is cooled by a secondary fluid such as ambient air. A vapor/liquid injection function is also provided for the refrigerant system. The intercooler function and the vapor/liquid injection function are selectively activated on demand depending on environmental conditions and thermal load in a conditioned space. This invention is particularly important for the CO2 refrigerant systems operating in the transcritical cycle.

The invention discloses an end-bend blade for improving the working stability of a gas compressor, which relates to the end-bend blade and solves the problems that a guide blade of the traditional gas compressor is enlarged with the load, a positive angle of attack at the position close to the end wall is gradually increased, thus the gas compressor enters into a stall situation in advance, and the working stability of the gas compressor is poor. The end-bend blade comprises a guide blade (1), wherein the upper part of the guide blade (1) is an end-bend area (3), the end-bend area (3) is subjected to end bending along a track of a stacking line (2), the end-bend height of the end-bend area (3) is 7% of the total height of the guide blade (1), an inlet geometric angle of the guide blade (1) is linearly increased by 0-10 degrees along the blade height in an end-bend height area, and an end-bend blade profile at the upper end of the guide blade (1)shifts 0-7.53 mm towards one side of a suction surface relative to the middle part of the guide blade (1). According to the end-bend blade disclosed by the invention, the inflow and the outflow of airflow can be more in fit with a blade profile curve of the blade and can be matched with an angle of a main flow area of the gas compressor, and the working stability of the gas compressor can be increased. The end-bend blade disclosed by the invention is used in the gas compressor.

The invention provides a sliding vane type expansion working machine. The working machine comprises a shell, a revolving shaft, clamping slots, a spring, a sliding slice, an air inlet pipe and an exhaust pipe, wherein the shell is of an oval structure, the length of a short shaft of the shell is equal to that of the diameter of the revolving shaft, and the same circumference of the external surface of the revolving shaft is provided with a plurality of clamping slots; the clamping slots are symmetrically distributed, one end of the spring is fixedly connected with the bottoms of the clamping slots, and the other end of the spring is connected with one end of the sliding slice; the other end of the sliding slice is contacted with the inner surface of the shell, the interior of the shell is divided into an upper working cavity and a lower working cavity by virtue of the revolving shaft, and the air inlet pipe and the exhaust pipe are respectively communicated with the two sides of the working cavity. The sliding vane type expansion working machine has the advantages that an expansion machine with a fixed volumetric ratio is high in expansion isentropic efficiency, the homocentric design of the revolving shaft and the shell has the advantages of slight vibration, low side pressure, small friction and volume, capability of rapidly operating and the like, the whole machine structure is high in reliability and low in manufacturing cost, and the working effects such as high-temperature gas resistance and high isentropic expansion efficiency are realized.

The invention discloses an organic working medium expansion machine rotor. The organic working medium expansion machine rotor has good pneumatic isentropic efficiency and reasonable axial force, can better adapt to variable working conditions, and is reasonable in structure and convenient to assemble. A chamber A is separated in an air inlet shell, and static pressure in the chamber A is PA; a chamber B is separated, and the static pressure in the chamber B is PB; a chamber C is separated, and the static pressure in the chamber C is PC; a chamber D is separated, and the static pressure in the chamber D is PD; a chamber E is separated, and the static pressure in the chamber E is PE; a chamber F is separated, and the static pressure in the chamber F is PF; a chamber H is separated, and the static pressure in the chamber H is PH; a chamber G is separated, and the static pressure in the chamber G is PG; a gap between a balance air seal and a balance disc forms an air flow channel M, an air flow channel N is formed in an air inlet shell 1, a minimum sectional area of the air flow channel M in the air flowing direction is S1, and the minimum sectional area of the air flow channel N in the air flowing direction is S2; PA> PB> PC> PD> PE>PF> PG-PH; (PA-PC)>(PC-PE)>(PE-PH); 7> (PA-PB)/ (PB-PC)> 5, 4> (PC-PD)/(PD-PE)>2; 4> (PE-PF)/ (PF-PH)> 2; 1.3H/ A> S2/ S1> H/A, PG< PH+50KPa.

The invention discloses a second-level turbine boosting system and the double-shaft second-level turbine booster in the middle and large power high boosting diesel engine applied to ship, naval vessels and vehicle and the electricity generation. The low and high pressure level are made up of a normal structure single shaft turbine booster and a single shaft radial fan turbine booster, which are connected together in series with a boosting pipe between the outlet of the high pressure turbine and the inlet of the low pressure level turbine. Compared with current device, the invention can be applied to the second turbine boosting system in high boosting diesel machine with middle and large power applied to the quality.

An integrated refrigeration and air conditioning plant working with environmentally friendly natural refrigerant carbon dioxide (CO2) and an ozone friendly non CO2 refrigerant. The low temperature refrigeration is provided by evaporating CO2 and the fluid is used as a secondary refrigerant, predominantly in liquid mode, for medium temperature refrigeration. The heat rejection from CO2 occurs to another upper stage cascaded refrigeration system that operates with a ozone friendly non CO2 refrigerant. Since air conditioning applications require cooling at temperatures higher than refrigeration for food sector, cooling for this range is derived from the non CO2 refrigerant.

The invention provides a blade, a fan and an aircraft environment control system. The blade comprises a trailing edge (1), a leading edge (2), a rear edge (3) and a blade tip (4), wherein on any wing section of the blade, and the connecting line of the leading edge point of the leading edge (2) and the rear edge point of the rear edge (3) is a wing chord; and the length of the wing chord is the chord length, and the distance between the position, with the maximum airfoil thickness, of the wing section and the leading edge point accounts for 30%-40% of the whole chord length. According to the blade provided by the invention, the fan can be transformed, the airfoil pre-compressed part of the fan is added, the shock loss is weakened, and the isentropic efficiency of the fan is improved.

The invention discloses a novel volute structure of a centrifugal machine. The novel volute structure of the centrifugal machine comprises an inner volute and an outer volute, wherein the inner voluteis arranged in the outer volute, the outer volute is provided with an air outlet channel, and the inner volute is provided with a receding groove and a receding through hole; the receding groove communicates with the receding through hole; and a curve is arranged in the inner volute and communicates with the air outlet channel, and the curve communicates with the receding groove and the recedingthrough hole. The novel volute structure of the centrifugal machine is simple in structure and is applied to the centrifugal machine to be matched with an impeller and a diffuser so that the guiding and diffusing effects of the volutes can be better achieved, the pneumatic loss is reduced, and the isentropic efficiency is improved; the friction between the flow and the walls of the volutes is reduced, and the operating noise of the centrifugal machine is lowered; and the universality of the volutes is improved, and economic benefits are increased.

The invention relates to an impeller marginal line matching method and device. The impeller marginal line matching method comprises the following steps of: obtaining on-way speed distribution of a fluid flowing from an upstream guide vane to a downstream guide vane through a speed pre-obtaining model; determining a circumferential total offset distance of the fluid flowing the tail edge of the upstream guide vane to the front edge of the downstream guide value according to the on-way speed distribution; and obtaining an optimal time sequence position of the front edge of the downstream guide vane relative to the tail edge of the upstream guide value according to the circumferential total offset distance. According to the impeller marginal line matching method, optimal time sequence positions of impellers can be simply and rapidly searched, so that the process of carrying out analog calculation through numerical software is avoided, the calculation time and calculation resources can besaved, and the design efficiency can be improved.

The invention provides a compressor and heat pump equipment. The compressor comprises at least one air cylinder assembly, a supporting piece, an air injection channel and the one-way valve, each air cylinder assembly is provided with an exhaust cavity, and a first mounting groove is formed in the end face of each air cylinder assembly; the supporting piece is arranged on one side of one air cylinder assembly in the at least one air cylinder assembly, a second mounting groove is formed in the end face of the supporting piece, the second mounting groove and the first mounting groove are oppositely formed, and the first mounting groove and/or the second mounting groove communicate/communicates with the exhaust cavity; the air injection channel is arranged on the at least one air cylinder assembly and/or the supporting piece, and the air injection channel can communicate with the first mounting groove and the second mounting groove; and the one-way valve is arranged in the first mounting groove and/or the second mounting groove. An air supplementing cavity is partially formed in the air cylinder assembly and partially formed in the supporting piece, the forming depth of the first mounting groove and the forming depth of the second mounting groove cannot be too large, the structural strength of the air cylinder assembly and the supporting piece are guaranteed, the stability is high,and use is safe and reliable.

The invention relates to a condenser and a condenser efficiency improving method, and the condenser efficiency improving method comprises the steps that a high-pressure and high-temperature superheated gaseous refrigerant from a compressor is guided into a liquid refrigerant area in the condenser, and the high-pressure and high-temperature superheated gaseous refrigerant and the liquid refrigerant in the condenser can generate a heat transfer effect; the high-pressure and high-temperature superheated gaseous refrigerant generates a cooling condensation phenomenon, and the liquid refrigerant in the condenser generates a heating gasification phenomenon due to heat absorption, so that the efficiency of the condenser is improved.

The invention provides a bearing assembly, a compressor and heat pump equipment. The bearing assembly is used for the compressor and comprises a bearing and an air injection channel. The air injectionchannel is arranged on the bearing, and comprises at least two air injection sub-channels; and the at least two air injection sub-channels can communicate with an exhaust cavity of the compressor. The air injection channel is formed in the bearing, and can be used for conveying medium-pressure air into the exhaust cavity of the compressor, so that the exhaust temperature of the compressor is reduced, and meanwhile, the heating capacity of the heat pump equipment applying the compressor under the low-temperature working condition can be improved. Due to the fact that the bearing is only one part in the compressor, the air injection channel is arranged on the part, and the main structure can be improved and concentrated on the part, so that the influence on other parts of the compressor issmall, and the improvement cost of the compressor can be reduced.

The invention discloses a matching calculation method for a centrifugal impeller and a diffuser under a pre-swirl air intake condition. The method comprises the steps of giving air medium characteristic parameters including an adiabatic exponent and a gas constant; giving centrifugal impeller design parameters including a centrifugal impeller inlet pre-swirl angle, a centrifugal impeller inlet wheel cap relative axial airflow angle, a centrifugal impeller inlet wheel cap relative Mach number and a total pressure ratio; calculating normalized diffuser blockage flow; calculating normalized diffuser blockage flow; calculating a ratio of a diffuser blockage throat area to a centrifugal impeller blockage throat area when the centrifugal impeller is completely matched with the diffuser; giving centrifugal impeller inlet total parameters including an inlet total temperature, an inlet total pressure and given designed blockage flow; calculating centrifugal impeller inlet total density and inlet stagnation sound velocity; calculating the diffuser blockage throat area when the centrifugal impeller is completely matched with the diffuser; and calculating a change law of the centrifugal impeller blockage throat area along with a flow position when the centrifugal impeller is completely matched with the diffuser. A centrifugal air compressor manufactured by the method has higher isentropicefficiency and a wider stable working condition range.

A scroll compressor for a motor vehicle air-conditioning system includes a compressor housing, two interleaving spirals within the compressor housing, of which one spiral is stationary and the other spiral is movable eccentrically on a circular orbit, whereby the volume of compression chambers formed between the spirals changes cyclically and refrigerant is suctioned in and compressed; at least one refrigerant outlet port for ejecting the compressed refrigerant in a wall, frontal to the spirals, of the compressor housing in the center of the stationary spiral, wherein in the spiral end region on the inner end of at least one of the two spirals the concave side of the spiral wall is provided with a cut that has the form of a cone segment with concave curvature, decreasing from the upper end in the direction toward the lower end of the spiral wall.

The invention aims to provide an oily sludge pyrolysis energy recovery system based on a single-screw expander to fully utilize a large amount of waste heat resources existing in an existing oily sludge pyrolysis system. The oily sludge pyrolysis energy recovery system comprises a pyrolysis reactor used for pyrolyzing oily sludge into pyrolysis flue gas, pyrolysis oil gas and solid residues; wherein a pyrolysis flue gas outlet of the pyrolysis reactor is connected with a first evaporator, heat exchange between pyrolysis flue gas and a first organic working medium is achieved in the first evaporator, and the first evaporator is further connected with a flue gas purification device and used for discharging the pyrolysis flue gas; the first evaporator is provided with a first organic workingmedium inlet and a first organic working medium outlet, and the first organic working medium outlet is sequentially connected with a first single-screw expander, a first condenser and a first workingmedium pump in series through a pipeline and then connected back to the first organic working medium inlet. And the first single-screw expander is connected with a first generator.