30results about How to "Control heat transfer efficiency" patented technology

The invention discloses a pressure cooling process of segmented reinforcing type parts of a hot forming steel pipe, and a die hydraulic device. Through a hydraulic cylinder device in a die, existence of pressure keeping loading force borne by a workpiece is controlled according to the design requirements, and therefore the cooling speed of each sub-area is controlled, and different types of material mechanical performance of the sub-areas of a tubular product is obtained. Required material characteristics can be achieved for any area according to the design requirements, no additional die heating device needs to be arranged, and production cost and procedure complexity are greatly reduced.

The invention discloses a cooling-heating type air conditioning system and a cooling type air conditioning system. The cooling-heating type air conditioning system comprises a compressor, a reversing assembly, an outdoor heat exchanging assembly, an indoor heat exchanger, a controller and a temperature detection device; the reversing assembly comprises a first valve port, a second valve port, a third valve port and a fourth valve port; the outdoor heat exchanging assembly comprises n heat exchanging parts, the first end of each heat exchanging part is connected with the second valve port, and control valves are connected between the n-1 heat exchanging parts and the second valve port, wherein n is greater than or equal to 2; one end of the indoor heat exchanger is connected with the third valve port, the other end of the indoor heat exchanger is connected with one end of a throttling element, and the other end of the throttling element is connected with the second end of each heat exchanging part; the temperature detection device is used for detecting outdoor environment temperature, and the controller is connected with the temperature detection device, the reversing assembly and all the control valves and controls the opening number of the control valves according to the detection result of the temperature detection device. The cooling-heating type air conditioning system is good in low-temperature cooling effect.

The invention discloses a pressure cooling process of segmented reinforcing type parts of a hot forming steel pipe, and pressing machine hydraulic ejector rod devices. By turning on and turning off the independent pressing machine hydraulic ejector rod devices, the magnitude of average loading force borne by a workpiece is adjusted, and the cooling speed of each sub-area of the workpiece is controlled, and therefore different types of material mechanical performance of the sub-areas of the workpiece are obtained. Required material characteristics can be achieved for any area according to the design requirements, no additional die heating device needs to be arranged, and production cost and procedure complexity are greatly reduced.

A pressure cooling technology for segmented and strengthened parts of a hot-formed steel pipe and press servo top rod devices are characterized in that through the independent press servo top rod devices, the magnitude of loading force applied on workpieces and/or the length of time of stress and pressure applied on the workpieces can be adjusted, the each sub-regional cooling speed of the workpieces can be controlled, so that the mechanical performances of different materials in each sub-regional of the workpieces can be obtained. By means of the pressure cooling technology for the segmented and strengthened parts of the hot-formed steel pipe and the press servo top rod devices, the needed material performance can be achieved in any region according to a requirement of a design, an extra die heating device is not needed to be arranged, and production cost and process complexity can be reduced greatly.

The invention discloses a multifunctional structure with the heat absorption cooling effect and the vibration reduction effect. The multifunctional structure comprises center frameworks made of high-elasticity high polymer materials and peripheral frameworks which surround the center frameworks in a connected mode and are made of high-elasticity high polymer materials. The center frameworks and every other peripheral framework are filled with flowing fillers with the heat absorption cooling effect. One or more small holes are formed in the side walls of the peripheral frameworks which are not filled with the fillers. The multifunctional structure further comprises high polymer material packaging layers for packaging the fillers. The peripheral frameworks which are not filled with the fillers are provided with or are not provided with the high polymer material packaging layers in a packaged mode. When the temperature of the environment where the multifunctional structure is located is higher than certain threshold temperature, the fillers start to absorb heat to achieve the cooling effect; after losing the heat absorption cooling effect, the fillers are placed into the environment with the temperature lower than the threshold temperature, and the cooling effect will be automatically recovered. Meanwhile, in the vibration process, the multifunctional structure is the equal of an elastic damper, and the vibration reduction effect is achieved by absorbing energy generated during vibration.

Disclosed are a pressure cooling process for thermally-formed steel plate sectionally-strengthen-type parts and a press hydraulic ejector rod device in the field of thermal-forming punching. Through switching on and off of each independent press hydraulic ejector rod device, strength of average loading force applied on a workpiece is controlled to control cooling speed of each sub-region so as to acquire mechanical performance of different materials of all sub-regions of the workpiece. By the pressure cooling process and the press hydraulic ejector rod device, needed material characteristics can be realized at any region according to design needs without additionally arranging a die heating device, so that production cost and process complexity are lowered remarkably.

The invention discloses a pressure cooling process of segmented reinforcing type parts of a hot forming steel plate, and pressing machine servo ejector rod devices. Through the independent pressing machine servo ejector rod devices, the magnitude of loading force borne by a workpiece and/or force bearing and pressure keeping time for the workpiece are adjusted, and therefore the cooling speed of each sub-area of the workpiece is controlled, different types of material mechanical performance of the sub-areas of the workpiece are obtained. Required material characteristics can be achieved for any area according to the design requirements, no additional die heating device needs to be arranged, and production cost and procedure complexity are greatly reduced.

The invention discloses an optimal waste heat utilization set for use at the cold end of a boiler of a thermal power generating unit. An air-oil heat exchanger and a flue gas-oil heat exchanger are provided behind an air preheater; the air-oil heat exchanger is connected with the flue gas-oil heat exchanger through a circulating pipeline; the circulating pipeline is filled with heat transfer medium, heat transfer oil; the circulating pipeline is provided with an expansion tank and a circulating pump. One end of the flue gas-oil heat exchanger is connected with a flue gas outlet of the air preheater; the other end of the flue gas-oil heat exchanger is provided with another flue gas outlet. One end of the air-oil heat exchanger is connected with an air inlet of the air preheater; the other end of the air-oil heat exchanger is provided with another air inlet. The optimal waste heat utilization set has the advantages that smoke emission temperature can be greatly lowered, utilization of flue gas waste heat is achieved, load of the air preheater is reduced, thermal deformation and air leakage are reduced for the air preheater, and energy consumption of the thermal power generating unit is reduced.

The invention relates to the technical field of air conditioners, in particular to a fan control method for an air conditioner indoor heat exchanger, and aims to solve the problems of non-uniform shunting of branches of an air conditioner, low utilization rate of an evaporator and serious resource waste. In order to achieve the purpose, the air conditioner indoor heat exchanger comprises a sectional type heat exchanger with multiple sections of heat exchange branches, and a first branch port and a second branch port of each section of heat exchange branch are connected with a first pipeline port and a second pipeline port of an air conditioner indoor refrigerant circulation pipeline correspondingly. The control method comprises the steps that after an air conditioner operation instruction is received, the initial rotating speed of the branch fans is determined according to the temperature difference between the actual room temperature and the set room temperature, and if the air conditioner operates in a refrigeration mode, the branch fans are started to rotate; if yes, the initial rotating speed of the branch fan of the lower section of heat exchange branch with the maximum temperature difference between the refrigerant outflow sides of every two sections of heat exchange branches is adjusted; and if the air conditioner operates in the heating mode, the initial rotating speed of the branch fan is kept unchanged.

The invention provides a boiler circulation heat conduction structure. A heat gathering cavity, heat exchange pipes and a circulation pipe are included. The part, above a heating device, at the bottomof a boiler body is provided with the heat gathering cavity, and heat conduction media are arranged in an inner cavity of the heat gathering cavity. The heat gathering cavity communicates with at least one heat exchange pipe, the heat exchange pipes penetrate through the boiler body and communicate with the circulation pipe, and the circulation pipe communicates with the heat gathering cavity. The circulation pipe is provided with a circulation drive device. Through the arrangement of the structure of the heat gathering cavity, the structure of a double-layer water cavity in the prior art iseliminated, and the machining difficulty is lowered; by adoption of the common cylinder and circular-roof boiler structure, the pressure bearing capability of a boiler can be better improved, and themachining cost is greatly reduced. Through the arranged heat gathering cavity, flames of the heating device can be centralized at the bottom of the boiler body, and the fuel utilization rate is increased. In the preferable scheme, a circulation pump is arranged so that the heat exchange pipes can be rapidly utilized for conducting heat to water in the boiler body, and heat generated during combustion of the heating device is further sufficiently utilized.

The invention provides an energy-gathering heat-conducting boiler, which includes a boiler body, a heat collecting cavity is provided at the bottom of the boiler body and above the heating device, and a heat-conducting medium is arranged in the cavity inside the heat collecting cavity; the heat collecting cavity is connected with at least one The heat exchange tube is connected, the heat exchange tube passes through the boiler body and communicates with the circulation pipe, and the circulation pipe communicates with the heat collecting chamber. The heat collecting chamber is composed of a plurality of ring-shaped or spiral metal tubes, the top of the heat collecting chamber is the bottom of the boiler body, and the bottom of the heat collecting chamber is open. Through the structure of the heat collecting chamber, the structure of the double-layer water chamber in the prior art is canceled, which reduces the difficulty of processing, and adopts the commonly used boiler structure with a columnar shape and a round top, which is also conducive to increasing the pressure bearing capacity of the boiler. , and also greatly reduce the processing cost. The set heat collecting chamber can make the flame of the heating device be concentrated at the bottom of the boiler body, thereby increasing the utilization rate of the fuel.