32results about How to "Increase heat transfer distance" patented technology

The invention relates to a heating device which comprises a heating furnace and at least one heat exchange compression box connected with the heating furnace. The heating device is characterized in that an air inlet pipe and an exhaust pipe are arranged in the heat exchange compression box, one end of the air inlet pipe is connected with the heating furnace, the other end is communicated with theexhaust pipe through at least three rows of S-shaped and at least three layers of S-shaped heat exchange pipes, the air inlet pipe is continuously bent like V, a dust collection chamber is arranged at the tail end of the lower part of each V-shaped bending part, and a water circulation cooling system is arranged in the dust collection chambers and the heating furnace. The heating device can effectively settle dust in the air, avoid pipelines from being blocked by the dust, improve the combustion heat value, prolong the service life of the device and realize the significant effects of environmental protection and energy conservation.

The invention discloses a loop heat pipe-type cylindrical solar seawater desalination device. The device comprises a cylindrical multiple-effect distiller, a light collection groove and a loop heat pipe. An evaporating pipe of the loop heat pipe is used as a solar heat collecting pipe and a condenser pipe of the loop heat pipe is used as a distiller heating pipe so that characteristics of good heat transfer performance and high integral efficiency are obtained. A heating pipe, a heat-transfer pipe, a semi-circular groove and a nozzle unit are tightly arranged in a heat-insulation cylinder inner-cavity so that a pre-heating chamber, a distillation chamber, a seawater tank and a fresh water tank are formed and thus the distiller structure is very compact, can be processed easily and is suitable for standard production. The distiller has the characteristics of repeated use of vaporization latent heat, reinforcement of inner heat and mass transfer processes and improvement of an operation temperature. The heat transfer areas of the distillation chamber are increased from inside to outside so that a small heat transfer temperature difference is kept, the whole distiller effective number is improved and a concentration ratio and a water yield are further improved. The loop heat pipe-type cylindrical solar seawater desalination device is suitable for low-cost modularization production and can be widely used in the field of solar energy seawater desalination.

The invention belongs to the field of heat transfer, in particular to a combined oscillatory flow heat pipe with an evaporation and heat exchange connecting section. In the invention, a condensation end of a primary oscillatory flow heat pipe and an evaporation end of a secondary oscillatory flow heat pipe are both arranged in an evaporation and heat exchange connecting section and respectively, horizontally and fixedly connected to the lower part and the upper part of the evaporation and heat exchange connecting section; the evaporation and heat exchange connecting section is internally vacuumized, filled with a working solution and then sealed; the working solution immerses the condensation end of the primary oscillatory flow heat pipe to form an oscillatory flow heat pipe combination unit, and 1-3 stages of oscillatory flow heat pipe combination units are connected in series to form the combined oscillatory flow heat pipe with the evaporation and heat exchange connecting section; and the primary and the secondary oscillatory flow heat pipes of the oscillatory flow heat pipe combination unit can also be formed by connecting 2-5 oscillatory flow heat pips in parallel. The purpose of prolonging a heat transmission distance is achieved through the serial combination of the oscillatory flow heat pipes, and the purpose of expanding the heat radiating area is achieved through a parallel combination, thus the heat transmission capacity of the oscillatory flow heat pipes is obviously improved. The invention is suitable for the fields of high-efficiency compact heat exchangers, industrial afterheat recovery, solar energy utilization, and the like.

The invention provides a refrigerator and a frostless refrigerating system thereof. The frostless refrigerating system includes an air duct panel which is arranged in the refrigerator and positioned in the front of a back side liner; an air duct is formed between the air duct panel and the back side liner; an evaporator is arranged in the air duct and can divide the air duct into a front air duct and a back air duct; the back air duct is provided with an air returning opening which communicates with a cavity of the liner, and the front air duct is provided with an air supplying opening which can supply air to the cavity of the liner; a fan can drive air flow to flow to the front air duct from the back air duct; a motor can drive the fan to rotate; and the motor is connected to the fan. According to the refrigerator and the frostless refrigerating system thereof, primary heat exchange is performed when air flow passes through the back part of the evaporator during air returning, secondary heat exchange is performed when the air flow passes through a back air duct of the fan and then passes through the front part of the evaporator during air supplying, and in this way, heat exchange is performed between the front part and the back part of the evaporator and the air flow, the heat exchange distance is prolonged, the heat exchange efficiency is improved, the frosting amount is reduced, power consumption of defrosting is decreased, extra power consumption of defrosting is not required, and energy consumption of the refrigerator is decreased.

The invention relates to a heating floor formed by connecting a metal heat-transfer element and a heating element at low thermal resistance. The heating floor comprises a floor, a metal heat-conducting plate connected with the lower surface of the floor and a heating element connected with the metal heat-conducting plate at low thermal resistance. The heating floor is characterized in that the metal heat-conducting plate is connected with the floor by one of the following three manners or the combination of the three manners at low thermal resistance: (1) connecting by using a nail connecting member; (2) bonding; and (3) wrapping joining of the metal heat-conducting plate. The invention has the advantages that the metal heat-conducting plate is connected with the floor by using a nail-shaped connecting member, bonding and wrapping joining, the thermal resistance between the floor and the metal heat-conducting plate can be reduced, and the strength of the floor can be enhanced. A heating pipe can greatly increase the heat-transfer efficiency of the metal heat-conducting plate, increase the heat-transfer distance, and reduce differences in temperature and the quantity of the heating element. The 5-10 DEG C heat-transfer temperature drop from the heating element to the floor can be reduced, and the thermal resistance of a dry heating floor can be reduced to an ideal degree. Five embodiments are given by combining figures.

In a micro heat exchanger for the transfer of high area-specific amounts of heat from a heat source to a heat transfer medium, including a heat transfer structure with an inlet- and an outlet duct structure between which a plurality of passages extend through the heat transfer structure, the inlet and outlet duct structures are arranged in alternating order in the heat transfer area in close proximity to the heat source, with the inlet and outlet duct structure and the passages interconnecting the inlet and outlet structures covering the whole heat transfer area directly adjacent the heat source.

A body for at least one direct-broiling cooker, which is configured to suppress heat transfer to a drip channel, thus performing cooking function(s), without requiring water to be contained in the drip channel.

The present invention relates to a main body for an original direct flame baking oven capable of cooking even without filling water in a groove of an oil drip pan by inhibiting the flow approach of heat to the groove of the oil drip pan as much as possible.

The invention discloses a steam cycle generator with a solar heat collector and a spiral heat regenerator. The steam cycle generator is composed of a heat collecting device, a water pump, a spiral heat regenerator, a condenser, a solar heat collector, a generator and a steam turbine. A power generation mode based on a solar heat effect based on steam circulation is adopted, the integrated solar heat collector is used for collecting light energy, and the solar heat collector is used for gathering hot-gas to provide heat energy for a solar power generation system. The sphere center of a hemispherical spherical reflector of the solar heat collector is located on a heating layer of a shell, and heat is absorbed by a heat absorption plate to increase the heat exchange distance to strengthen heat exchange; the solar heat collector has the characteristics of good condensation effect and light weight. When the fluid in the spiral heat regenerator passes through a spiral structure, and the fluid flows in a spiral channel, so that the heat exchange distance is prolonged; the heat exchange is enhanced by the heat exchange between the two surfaces of the heat absorption plate, the spiral heatregenerator does not generate flow loss caused by separation of a boundary layer, the high utilization heat of the generator is realized, and the power generation efficiency of the generator is improved.

The invention relates to a heating device which comprises a heating furnace and at least one heat exchange compression box connected with the heating furnace. The heating device is characterized in that an air inlet pipe and an exhaust pipe are arranged in the heat exchange compression box, one end of the air inlet pipe is connected with the heating furnace, the other end is communicated with the exhaust pipe through at least three rows of S-shaped and at least three layers of S-shaped heat exchange pipes, the air inlet pipe is continuously bent like V, a dust collection chamber is arranged at the tail end of the lower part of each V-shaped bending part, and a water circulation cooling system is arranged in the dust collection chambers and the heating furnace. The heating device can effectively settle dust in the air, avoid pipelines from being blocked by the dust, improve the combustion heat value, prolong the service life of the device and realize the significant effects of environmental protection and energy conservation.

The invention provides an efficient, energy-saving and environment-friendly high-temperature calcination device for electrode paste raw materials. The efficient, energy-saving and environment-friendlyhigh-temperature calcination device for the electrode paste raw materials comprises a hearth, a chimney, a feeding mechanism, a discharging mechanism and a controller. According to the technical scheme, every two unit furnace walls in each furnace unit communicate with each other; when flowing in each furnace unit, high-temperature smoke can randomly enter one unit furnace wall to make sure thatthe temperature of the center of the hearth and the temperature of the edges of the hearth are uniform and consistent, and thus, the calcination quality of the calcined materials is made uniform; combustible volatile matter generated after calcination of the raw materials enters unit flues via micropores in the unit furnace walls, so that heat is provided for the hearth, and the situation that thevolatile matter enters the atmosphere and pollutes the environment is prevented; opening and closing of electric brake valves are synchronously controlled through a timer, so that it is ensured thatthe feeding quantities of material channels are consistent; a conveying part in a discharging mechanism is formed by a plurality of conveying units which are of the same structure and are arrayed linearly, and the conveying units which operate stably can ensure that materials in the material channels have the same conveying opportunity, so that uniform discharging is ensured, and the process stability of the calcined materials is ensured.

The invention provides an aerospace loop heat pipe radiator composite thermal control system. The system comprises an evaporation end of a flat plate type loop heat pipe, a ceramic heating sheet, a radiant panel, a solar cell panel, a storage battery, a circuit, an evaporation loop pipeline, an electromagnetic valve and a temperature sensor, and the ceramic heating sheet is attached to the upper part of a heat dissipation component; the evaporation end of the flat plate type loop heat pipe is tightly attached to the ceramic heating piece, the condensation end dissipates heat outwards through a structure which extends and is embedded into the radiant panel by means of a condensation pipeline, and condensed liquid obtained after heat dissipation circulates back to the evaporation end; the electromagnetic valve is mounted on the evaporation loop pipeline; one end of the storage battery is communicated with the evaporation end of the loop heat pipe through a line, and the other end is connected with the solar panel through a line; and the temperature sensor is installed on the outer side of the heat dissipation component. The heat pipe radiator heat dissipation system and a solar electric heating system are creatively combined, and the zero-energy-consumption heat dissipation and heat preservation effects can be integrally achieved.

The invention discloses a heat dissipation system based on a pump drive capillary phase change loop. The heat dissipation system comprises a first liquid pipeline, a second liquid pipeline, a steam pipeline, an ejector and an evaporator. The first end of the second liquid pipeline is communicated with the first end of the first liquid pipeline through the ejector, and the second end of the secondliquid pipeline is communicated with the second end of the first liquid pipeline through the evaporator; the first end of the steam pipeline is communicated with the first end of the first liquid pipeline through an ejector; the second end of the steam pipeline is communicated with the second end of the first liquid pipeline through the evaporator; an active heat dissipation technology and a passive heat dissipation technology are combined; the heat exchange capability is improved by utilizing phase change latent heat of the working medium; the heat dissipation system meets the heat dissipation requirement of high heat flow density, has high heat transfer efficiency, improves the power of electric power and electronic devices, improves the working efficiency of the electric power and the electronic devices. The defects that a loop heat pipe and a capillary pump loop are small in transmission distance, difficult to start and the like are overcome, and the heat dissipation system adaptsto heat dissipation of the electronic devices with different heat flow densities.

The invention provides a steam cycle generator with a fresnel lens and a honeycomb regenerator, and relates to the field of steam circulation power generation. The integrated fresnel lens is utilizedto collect luminous energy, then the regenerator is used for increasing the heat exchange distance to enhance heat exchange. The steam cycle generator with the fresnel lens and the honeycomb regenerator has the beneficial effects that the power generation mode which is based on steam circulation and utilizes the solar thermal effect is adopted, a monocrystalline silicon material and a polycrystalline silicon material are completely replaced, so that the production energy consumption is reduced, and the pollution is reduced; the honeycomb structure heat regenerator is adopted, the heat exchangeis enhanced by utilizing the increase of the heat exchange distance, the honeycomb structure does not relate to the problem of flow separation, and therefore flow loss caused by separation of a attached surface layer is avoided; and a fluid flows in a honeycomb structure channel, the heat exchange distance is extended, the heat exchange is enhanced by heat exchange on the two faces of a heat absorption plate, so that the relatively high power generation efficiency of the generator is ensured.

The invention discloses a heat exchange compressor, comprising a heating furnace and at least one heat exchange compression box connected with the heating furnace. The heat exchange compressor is characterized in that the interior of the heat exchange compression box is provided with an intake pipe and an exhaust pipe, one end of the intake pipe is connected with the heating furnace, and the otherend is communicated with the exhaust pipe by at least three columns of S-shaped heat exchange pipes and at least three layers of S-shaped heat exchange pipes; and the intake pipe is bent in a continuous V shape, and a dust bin is arranged at the tail end of the lower part of each V-shaped bending. The heat exchange compressor efficiently settles the dust in the gas, cleans the pipeline to avoid blocking the pipeline by dust and has obvious energy-saving effect.

The invention discloses an electric heating methanol reformer, and aims to provide an electric heating methanol reformer which is compact in structure, small in size, small in occupied space, uniform in heating, high in hydrogen production efficiency and high in reactor starting speed. The reformer comprises a reformer body, and the reformer body is provided with a raw material heat exchange area, a raw material preheating area, an electric heating area, a reforming area, a reformed synthetic gas exhaust loop and a heat insulation area. The tail end of the raw material heat exchange area is communicated with the head end of the raw material preheating area, the tail end of the raw material preheating area is communicated with the head end of the reforming area, and the tail end of the reforming area is communicated with the head end of the reformed synthetic gas exhaust loop. The electric heating area is arranged corresponding to the reforming area and the raw material preheating area. The reformed synthetic gas discharge loop is arranged corresponding to the raw material heat exchange area, and hydrogen-rich gas in the reformed synthetic gas discharge loop exchanges heat with raw materials in the raw material heat exchange area. The invention relates to the technical field of methanol reformers.

The invention belongs to the field of heat transfer, in particular to a combined oscillatory flow heat pipe with an evaporation and heat exchange connecting section. In the invention, a condensation end of a primary oscillatory flow heat pipe and an evaporation end of a secondary oscillatory flow heat pipe are both arranged in an evaporation and heat exchange connecting section and respectively, horizontally and fixedly connected to the lower part and the upper part of the evaporation and heat exchange connecting section; the evaporation and heat exchange connecting section is internally vacuumized, filled with a working solution and then sealed; the working solution immerses the condensation end of the primary oscillatory flow heat pipe to form an oscillatory flow heat pipe combination unit, and 1-3 stages of oscillatory flow heat pipe combination units are connected in series to form the combined oscillatory flow heat pipe with the evaporation and heat exchange connecting section; and the primary and the secondary oscillatory flow heat pipes of the oscillatory flow heat pipe combination unit can also be formed by connecting 2-5 oscillatory flow heat pips in parallel. The purposeof prolonging a heat transmission distance is achieved through the serial combination of the oscillatory flow heat pipes, and the purpose of expanding the heat radiating area is achieved through a parallel combination, thus the heat transmission capacity of the oscillatory flow heat pipes is obviously improved. The invention is suitable for the fields of high-efficiency compact heat exchangers, industrial afterheat recovery, solar energy utilization, and the like.

The invention discloses structural and functional integrated tempered vacuum glass and a manufacturing method thereof. The vacuum glass has remarkable advantages that the vacuum glass forms a stereoscopic stress structure by folded edges, bending resistance and breaking strength are remarkably enhanced, the peripheral strength of the vacuum glass is remarkably enhanced, and excellent heat insulation performance, safety and reliability are given to the vacuum glass by the aid of unique folded edges, a plurality of vacuum layers and a high-thickness vacuum layer structure and the manufacturing method. The vacuum glass solves the problem that industrial development of the glass is seriously restricted as safety of existing vacuum glass is low, and the vacuum glass has vital significance for development of projects, products and industries. The durability of the vacuum glass is ten times or more of that of the existing vacuum glass, so that the service life of the vacuum glass is as same as that of a building. The vacuum glass serving as a structural and functional integrated product is wide in application market. The heights and the thicknesses of the folded edges and the thicknesses,the layer number and the vacuum degree of the vacuum layers are adjusted, and bending resistance, fracture resistance, impact strength and heat insulation properties are correspondingly set, so thatthe vacuum glass serving as a structural and functional integrated material completely meets the requirement that energy consumption of the building is reduced by 65%-75%, and the vacuum glass also meets comprehensive requirements such as passiveness and zero energy consumption of the building for curtain walls, walls, roofs, doors and windows.

The invention discloses a loop heat pipe-type cylindrical solar seawater desalination device. The device comprises a cylindrical multiple-effect distiller, a light collection groove and a loop heat pipe. An evaporating pipe of the loop heat pipe is used as a solar heat collecting pipe and a condenser pipe of the loop heat pipe is used as a distiller heating pipe so that characteristics of good heat transfer performance and high integral efficiency are obtained. A heating pipe, a heat-transfer pipe, a semi-circular groove and a nozzle unit are tightly arranged in a heat-insulation cylinder inner-cavity so that a pre-heating chamber, a distillation chamber, a seawater tank and a fresh water tank are formed and thus the distiller structure is very compact, can be processed easily and is suitable for standard production. The distiller has the characteristics of repeated use of vaporization latent heat, reinforcement of inner heat and mass transfer processes and improvement of an operation temperature. The heat transfer areas of the distillation chamber are increased from inside to outside so that a small heat transfer temperature difference is kept, the whole distiller effective number is improved and a concentration ratio and a water yield are further improved. The loop heat pipe-type cylindrical solar seawater desalination device is suitable for low-cost modularization production and can be widely used in the field of solar energy seawater desalination.

The invention provides a supporting rod structure for a superconducting magnet in a low-temperature environment and the superconducting magnet, the structure comprises a supporting rod base, a first supporting rod and a supporting rod sleeve assembly, the supporting rod base is fixedly arranged on an inner Dewar of the superconducting magnet, and the first supporting rod comprises a first connecting end, a supporting body section and a second connecting end which are connected; the first connecting end is fixedly connected with the supporting rod base, the supporting body section and the second connecting end penetrate through the outer Dewar to be arranged outside the outer Dewar, and the supporting rod sleeve assembly is arranged outside the outer Dewar and provided with a center containing cavity. The first supporting rod is arranged in the center containing cavity and fixedly connected with the supporting rod sleeve assembly through the second connecting end, the first supporting rod and the supporting rod sleeve assembly are coaxially arranged, and a gap is formed between the first supporting rod and the inner wall of the supporting rod sleeve assembly. According to the technical scheme, the technical problems that in the prior art, a superconducting magnet is complex in structure, large in heat leakage and poor in reliability are solved.

The invention provides a refrigerator and a frostless refrigerating system thereof. The frostless refrigerating system includes an air duct panel which is arranged in the refrigerator and positioned in the front of a back side liner; an air duct is formed between the air duct panel and the back side liner; an evaporator is arranged in the air duct and can divide the air duct into a front air duct and a back air duct; the back air duct is provided with an air returning opening which communicates with a cavity of the liner, and the front air duct is provided with an air supplying opening which can supply air to the cavity of the liner; a fan can drive air flow to flow to the front air duct from the back air duct; a motor can drive the fan to rotate; and the motor is connected to the fan. According to the refrigerator and the frostless refrigerating system thereof, primary heat exchange is performed when air flow passes through the back part of the evaporator during air returning, secondary heat exchange is performed when the air flow passes through a back air duct of the fan and then passes through the front part of the evaporator during air supplying, and in this way, heat exchange is performed between the front part and the back part of the evaporator and the air flow, the heat exchange distance is prolonged, the heat exchange efficiency is improved, the frosting amount is reduced, power consumption of defrosting is decreased, extra power consumption of defrosting is not required, and energy consumption of the refrigerator is decreased.

The invention discloses a super-fireproof door leaf, comprising a front panel (1), a rear panel (2) and a core panel (3) arranged between the front panel (1) and the rear panel (2), wherein the front panel (1) or / and the rear panel (2) are vacuum enclosed cavities, and the core panel (3) is composed of a plurality of polygonal frameworks (31) continuously spliced along a plane. The super-fireproof door leaf provided by the invention has light weight, good heat insulation effect and good fireproof performance.

The invention provides a stable pipeline type exhaust manifold which comprises a connecting branch pipe, and bottom plates are arranged on the connecting branch pipe. The exhaust manifold further comprises a fixing mechanism arranged between the two bottom plates, and one end of the fixing mechanism abuts against the side walls, close to the connecting branch pipe, of the bottom plates. The other end of the fixing mechanism is in threaded connection with a flange on an engine, so that the connecting branch pipe is fixed to the engine. And a cooling piece movably arranged on the connecting branch pipe in a sleeving mode and can move in the axis direction of the connecting branch pipe, so that the cooling piece has a locking state in which the cooling piece abuts against the fixing mechanism and a moving state in which the cooling piece is far away from the fixing mechanism. Compared with the mode that a bolt directly penetrates through the bottom plates to be in threaded connection with the flange on the engine in the prior art, the phenomenon that the temperature of the bottom plates and the connecting branch pipe is too high due to the fact that the bolt directly transfers heat to the bottom plates can be effectively reduced.

The remarkable advantage of the present invention is that the edge folding makes the vacuum glass form a three-dimensional force-bearing structure, thereby significantly enhancing the bending and flexural strength, and significantly enhancing the peripheral strength of the vacuum glass. The unique structure and manufacturing method of hemming, multiple vacuum layers, and high-thickness vacuum layers endow the product with excellent thermal insulation performance and excellent safety and reliability. So as to solve the bottleneck and chronic problem of low safety of the existing vacuum glass which seriously restricts the development of the industry, it is very important for the development of projects, products and industries. The durability of the product is more than ten times that of the existing vacuum glass, and it can truly achieve the same life as the building. As an integrated product of structure and function, it has a broad application market. Through the adjustment of the height and thickness of the hem, the thickness of the vacuum layer, the number of layers and the degree of vacuum, the bending resistance, bending resistance, impact strength and thermal insulation performance are set accordingly. %, comprehensive requirements for curtain walls, walls, roofs, doors and windows for passive and zero-energy buildings.

The invention relates to a diesel engine exhaust manifold fixing device. The diesel engine exhaust manifold fixing device comprises an exhaust manifold and is characterized in that fixing flanges are arranged on the portions, on the two sides of the exhaust manifold, of the root of the exhaust manifold respectively, fixing countersinks are formed in the two ends of each fixing flange respectively and connected with corresponding fixing blocks, each fixing block is provided with a fixing bolt in a penetrated mode through an unthreaded hole in the fixing block, the threaded part of each fixing bolt extends out of the corresponding fixing block, and the two fixing countersinks located in every two adjacent fixing flanges are pressed by the same corresponding fixing block. The diesel engine exhaust manifold fixing device has the advantages that the influence on the bolts by heat loads can be reduced, and then the fixation reliability is improved.

The invention discloses a heat conduction block and cold conduction block fixing structure of a semiconductor refrigeration device. Different from a traditional semiconductor refrigeration device fixing piece, a heat conduction block and a cold conduction block are sleeved with a hot end heat insulation insert block and a cold end heat insulation insert block correspondingly, the heat conduction block and the cold conduction block are firmly fixed to the corresponding insert blocks through fastening screws, the hot end heat insulation block and the cold end heat insulation block are connectedthrough a fastening bolt, and fixing of the whole device is achieved. Through the design of the heat insulation insert blocks, the device can be effectively fixed, and the work efficiency of a refrigeration sheet is improved; and the heat transfer distance between the hot end and the cold end is obviously increased through a heat transfer block and the heat insulation insert blocks, the problem ofcold and hot end heat exchange caused by a penetrating type screw joint manner of the traditional semiconductor refrigeration device fixing piece is solved, the structure is simple, cost is low, andmatching is easy.

The invention discloses a full reverse flow type heat recovery device. The heat recovery device comprises a shell extending in the axis direction, an inner cavity of the shell is divided into a heat exchange cavity and a water inlet cavity through a dividing tube plate, a heat exchange cylinder is arranged in the heat exchange cavity and comprises an air inlet cylinder and an inner cylinder which are connected together, and an air return cavity is formed between the heat exchange cylinder and the shell; a water return piece composed of an inner tube plate and an inner sealing head is arranged in the air inlet cylinder, and a water return cavity is formed between the inner tube plate and the inner sealing head; the end, facing the inner tube plate, of the inner cylinder is provided with an air inlet channel, and the inner cylinder communicates with the air inlet cylinder through the air inlet channel; an air outlet channel is formed in one end, facing the dividing tube plate, of the inner cylinder, and the inner cylinder communicates with the air return cavity through the air outlet channel; a tube nest is mounted in the heat exchange cylinder, one end of the tube nest communicates with the water return cavity through the inner tube plate, and the other end of the tube nest communicates with the water inlet cavity through the dividing tube plate; one end of a drain tube communicates with the water return cavity through the inner tube plate, and the other end of the drain tube is used as a refrigerant outlet. According to the heat recovery device, hydrogen corrosion can be reduced, the heat exchange efficiency can be improved, and the manufacturing cost can be reduced.

The invention discloses a centrifugal compressor and a heat pump system. The centrifugal compressor comprises a motor and a compression part. The motor comprises a motor shell and a motor shaft arranged in the motor shell. The compression part is arranged at the axial end of the motor and comprises an impeller, a driven shaft and a coupler, the driven shaft is connected with the impeller, and the coupler is connected with the motor shaft and the driven shaft so that the motor can drive the impeller to rotate. According to the centrifugal compressor, the driven shaft connected with the impeller is additionally arranged, and the motor shaft and the driven shaft are coaxially connected through the coupler, so that the axial distance between the motor and the impeller is increased, the heat transfer distance of airflow heat is increased, and heat transferred to the motor can be reduced, the main bearing of the motor operates in a normal temperature range, and the operation reliability of the compressor is improved.

The invention discloses a steam directly buried pipe. The steam directly buried pipe comprises a casing pipe, a core pipe, a heat-preserving structure, a fixed bracket and movable brackets, wherein the heat-preserving structure is wrapped on the core pipe; the fixed bracket and the movable brackets are arranged between the casing pipe and the core pipe; a corrugated pipe compensator is arranged at one end of the core pipe; the fixed bracket is arranged at the other end of the core pipe; the movable brackets are uniformly arranged between the corrugated pipe compensator and the fixed bracket; a clearance A is formed between one end of a protecting sleeve of the corrugated pipe compensator and the core pipe; a remedying device is concentrically sleeved on the protecting sleeve and the end of the core pipe where the clearance A is formed; the clearance A is communicated with the remedying device; the remedying device is provided with a steam exhausting device; the fixed bracket is trumpet-shaped; and on each movable bracket, a heat-isolating cushion is arranged between the core pipe and a hoop. The service life of equipment is prolonged, the heat energy loss is reduced, and the heat supply radius is increased.