53 results about "Evaporation duct" patented technology

The invention relates to the technical field of aerospace meteorology, and particularly discloses a domestic numerical weather forecast mode-based evaporation waveguide height determination method, which comprises the following steps of: obtaining meteorological coupling data output by a domestic numerical weather forecast mode CMA-MESO; determining parameters according to the meteorological coupling data and a turbulent flux algorithm COARE; constructing a temperature vertical profile and a specific humidity vertical profile according to the parameters, the Monin-Obchhoff similarity theory and an NPS model; constructing a modified refractive index profile according to the temperature vertical profile and the specific humidity vertical profile; and determining the height of the evaporation waveguide according to the height corresponding to the lowest point of the corrected refractive index profile. The method is suitable for determining the evaporation waveguide height in a domestic business meteorological mode.

The invention discloses a regional evaporation waveguide prediction method based on path loss inversion, and relates to the technical field of maritime communication. Actual measurement path losses corresponding to the multiple propagation signals are obtained through a point-to-point microwave propagation link, inversion is carried out on the actual measurement path losses corresponding to the multiple propagation signals, and the long-time-sequence evaporation waveguide height is obtained; taking the long-time-sequence evaporation waveguide height and the corresponding long-time-sequence meteorological and hydrological characteristics as a training sample set, training a recurrent neural network, and obtaining an evaporation waveguide height prediction model; the meteorological and hydrological characteristics comprise wind speed, air temperature, humidity, sea surface temperature, evaporation capacity, atmospheric pressure and rainfall capacity; predicting an evaporation waveguide height prediction value of each grid point in the target area through an evaporation waveguide height prediction model; and generating continuous regional evaporation waveguide height distribution through inverse distance weighted interpolation according to the evaporation waveguide height prediction value of each grid point in the target region. The method improves the prediction accuracy of the regional evaporation waveguide.

An evaporation duct diagnosis method based on EDH-SimUNet uses a variety of data collected within a region as input to the evaporation duct model and predicts the evaporation duct height above the sea surface in the region. The evaporation duct model is structured using EDH-SimUNet, which uses depthwise separable convolution for downsampling, transposed convolution for upsampling, and skip connections to mitigate gradient vanishing and information loss. EDH-SimUNet avoids the significant discrepancies in diagnostic results caused by the determination of universal functions, stability correction functions, and scale parameters in physical models under inhomogeneous and strongly stable atmospheric conditions. This diagnostic method effectively addresses the high time cost of iterative calculations in traditional physical evaporation duct models when diagnosing duct height. It can also adapt to changing data and environments, automatically adjusting parameters to optimize performance, and easily expand to new datasets and tasks.

The utility model discloses an evaporator assembly and refrigeration equipment, evaporator assembly is used for installing in refrigeration equipment, and evaporator assembly includes two groups of evaporation pipeline that set up adjacently, a plurality of fin fixedly on every group of evaporation pipeline, heating device for heating defrosting, and heating device includes two groups of heating wire, in the thickness direction of evaporator assembly, two groups of heating wire and two groups of evaporation pipeline are alternately arranged and set, and heating wire is fixed on fin. The utility model adopts two groups of heating wire and two groups of evaporation pipeline and alternately sets, and the heat of heating wire between two groups of evaporation pipeline can conduct to the evaporation pipeline position of both sides to heat defrosting to the frost on the both sides surface of evaporator assembly, to improve the efficiency of evaporator assembly heating defrosting. And, heating wire is directly contacted with fin, and the heat of heating wire is conducted to the surface of evaporator assembly through fin.

A heat dissipation cabinet includes a cabinet body and a heat dissipation apparatus. A first accommodation region of the cabinet body can accommodate a plugboard in a stacked manner, and heat source components of the plugboard dissipate heat through the heat dissipation apparatus. An evaporator, a condenser, and an evaporation pipeline of the heat dissipation apparatus are connected to a liquid return pipeline to form a heat exchange loop, and the evaporator is in thermal contact with an outer surface of a heat source component. The condenser is disposed in a second accommodation region and located above the evaporator. A refrigerant flows in the heat exchange loop, to draw heat of the heat source component far to the condenser, and take away heat of the condenser using air generated by a fan. A second accommodation region is used as an independent air duct whose path is relatively short.

The invention relates to the technical field of wireless communication, and discloses an offshore wireless propagation path loss hybrid modeling method suitable for an evaporation waveguide condition, which comprises the following steps: defining a coherent transition distance and a sight distance limit distance, and dividing a propagation area into a coherent interference dominant area, a transition area and an evaporation waveguide dominant area; constructing a CI-MTR core model used for describing the path loss of the coherent interference dominant region; based on a parabolic equation method, calculating path loss under an evaporation waveguide condition, and calculating an environmental excess loss item used for representing path loss change caused by a refraction effect; designing a transition weighting function for smooth fusion model prediction in the transition region; and combining the CI-MTR core model, the environmental excess loss item and the transition weighting function by adopting a piecewise function to form a unified mixed path loss model CI-MTR-PE. And path loss prediction with high precision, high physical interpretability and high calculation efficiency in a full-distance range is realized.

A kind of mute dehumidifier, including evaporator, collector, condenser, compressor, throttling element and connecting pipeline, evaporator, condenser, compressor and throttling element are connected by connecting pipeline;Evaporator is fixedly arranged in the first side of wall in indoor, evaporator includes evaporation pipe and temperature guide plate, evaporation pipe is fixedly installed temperature guide plate away from wall side, temperature guide plate covers at least part wall, collector is located below temperature guide plate, for collecting water drop condensed and fallen of temperature guide plate;Or, evaporator is fixedly arranged below floor or roof in indoor, temperature guide plate is arranged below evaporator, temperature guide plate is partially or entirely inclined at a certain angle, so that condensate can slide along temperature guide plate to lower position, collector is located below temperature guide plate, for collecting water drop condensed and fallen of temperature guide plate.The mute dehumidifier of the application removes fan, uses natural convection mode, not only can realize energy saving, but also can realize mute function.

The invention relates to the technical field of radar signal processing, and discloses an evaporation waveguide height prediction method for radar sea clutter, and the method comprises the steps: optimizing an initial population based on an elite reverse learning strategy to construct an initial solution population; wherein the initial solution population is composed of estimated angle values; classifying the initial solution population according to the fitness values of the king butterfly individuals in the initial solution population to obtain a high-quality population and a suboptimal population; updating individual positions of the empire butterfly of the high-quality population and the suboptimal population based on an optimized MBO algorithm; iterating the combined solution population based on a compound mutation operator to obtain a target solution population; wherein the combined solution population is generated by combining the updated high-quality population and the suboptimal population. According to the method, the evaporation waveguide height prediction accuracy and stability can be improved. The invention also discloses an evaporation waveguide height prediction device for radar sea clutter, detection equipment and a storage medium.

The application discloses a plate-tube type freezing evaporator in the technical field of refrigeration equipment, which comprises an evaporation plate and an evaporation pipe, the evaporation pipe is fixed on the evaporation plate, both ports of the evaporation pipe are located on the same side of the evaporation plate, a plurality of punching ports are arranged on the evaporation plate, the punching ports are oppositely arranged in pairs, a first folding edge is arranged at the opposite end of the opposite punching ports, the evaporation pipe is arranged on the inner side region opposite to the first folding edge, and the evaporation pipe can be arranged in a single-pipe independent fixing mode or a double-pipe parallel fixing mode in the inner side region, a second folding edge and a third folding edge are sequentially connected to the two sides of the evaporation plate, notches are arranged at the upper and lower ends of the second folding edge, and the two ports of the evaporation pipe penetrate the notches.

This invention relates to the field of aero-engine technology, disclosing a combustion assembly and an aero-engine. The invention includes: a flame tube; an evaporator tube comprising a main pipe and several branch pipes, one end of the main pipe forming an evaporator tube inlet, the branch pipes corresponding to the other end of the main pipe, and the ends of the branch pipes away from the main pipe forming several evaporator tube outlets, which are located within the flame tube; and a fuel supply structure connected to the evaporator tube inlet. This invention, by arranging the branched evaporator tubes in a blood vessel-like pattern on the flame tube, increases the probability of fuel breaking up upon impact with the wall under the action of the branched structure, resulting in better fuel atomization. Simultaneously, because the branched evaporator tubes have a larger contact area with the hot wall surface, they absorb more heat, thus allowing the fuel to be heated more fully, thereby evaporating more fuel and ultimately improving combustion efficiency.

The invention discloses a dual-mode low-emission combustion chamber matched with a standing vortex evaporation tube and a method. The combustion chamber comprises a multi-channel diffuser, an inner casing, an outer casing, a flame tube and a high-energy ignition electric nozzle. The flame tube comprises an outer ring wall plate, an inner ring wall plate, a single-concave-cavity structure, a cap cover, a cross flame supporting plate and M * N evaporation pipes. The trapped vortex combustion chamber is combined with two low-emission advanced combustion organization technologies of RQL and LPP, different combustion modes are adopted in different states or different areas in the whole flight cycle so as to adapt to the oil-gas ratios in different states, and the pollutant emission in the whole working condition range is reduced. And meanwhile, the M * N evaporation pipes can also be used for solving the problem that multiphase fuel oil is difficult to supply normally under the aviation kerosene phase state change caused by fuel oil regenerative cooling.

The application provides an air conditioning system and a control method thereof. The air conditioning system comprises a compressor, a condenser, a first evaporator, a second evaporator, a condensing pipeline and an evaporating pipeline. The condensing pipeline comprises a total condensing main pipeline and parallelly connected first and second condensing branch pipelines. The compressor is connected to the condenser. The condenser is connected to the first and second evaporators through the condensing pipeline. The evaporating pipeline comprises a total evaporating main pipeline and parallelly connected first and second evaporating branch pipelines. The first and second evaporators are both connected to the compressor through the evaporating pipeline. The horizontal height of the inlet of the first condensing branch pipeline is lower than that of the outlet of the first condensing branch pipeline.

The application relates to the technical field of aviation modified engines and discloses an annular backflow combustion chamber and an aero-engine. The annular backflow combustion chamber comprises an inner casing assembly, an outer casing assembly provided with a first nozzle mounting seat, a flame tube comprising an outer ring assembly and an inner ring assembly, an evaporation cavity assembly which is connected between the outer ring assembly and the inner ring assembly and is located at the head of the flame tube, and the evaporation cavity assembly is provided with a first nozzle hole; and an evaporation nozzle which is arranged in the outer casing assembly and the nozzle outlet of the evaporation nozzle is arranged in the evaporation cavity assembly. Compared with the mode that the evaporation pipe is arranged outside the outer ring of the flame tube, the evaporation cavity assembly of the application is connected between the outer ring assembly and the inner ring assembly of the flame tube and is located at the head of the flame tube, so that the evaporation cavity assembly is not affected by the limitation of the radial dimension of the combustion chamber, sufficient evaporation length and oil-gas mixing space can be ensured, fuel atomization and evaporation are more sufficient, and the combustion efficiency of the annular backflow combustion chamber is improved.

The utility model discloses an evaporative tube structure of ice maker, including evaporative tube and ice maker frame, and the spiral is formed in its inside through the ice maker frame to evaporative tube, and the inlet pipe and the outlet pipe of evaporative tube through the ice maker frame are arranged adjacently, and the wall of frame has big gap, and there are also two semicircular first small gaps in big gap for placing the inlet pipe and the outlet pipe of evaporative tube, still include briquetting, and the overall shape of briquetting is identical with big gap to can with big gap and is fixed through screw, and the second small gap of two semicircular of briquetting also has, and with first small gap one to one correspondence and is split into complete circular, and the circular of first small gap and second small gap split into and the inlet pipe and the outlet pipe of evaporative tube interference fit. The utility model discloses one side can fix evaporative tube on the frame, make it will not change position because of buoyancy etc.

A gas heat exchange device for micro direct current variable frequency air conditioner or fixed frequency air conditioner, comprising an evaporation pipe and a ventilation pipe arranged in the evaporation pipe and penetrating the evaporation pipe at both ends; a cavity for conveying refrigerant is formed between the inner wall of the evaporation pipe and the outer wall of the ventilation pipe, the first end of the evaporation pipe is provided with a capillary pipe in communication with the cavity, and the tail end of the evaporation pipe is provided with a conveying pipe in communication with the cavity. The present application can replace the traditional fin type evaporator, has high heat exchange efficiency, small volume and is suitable for small and micro air conditioners.

The invention discloses refrigeration equipment which comprises an inner container and an evaporation pipe wound on the periphery of the inner container, a storage chamber is defined by the inner container, the refrigeration equipment further comprises a temperature equalizing module arranged in the storage chamber, and the temperature equalizing module is connected with the inner container and exchanges heat with the inner container; the temperature equalizing module comprises a shell and an air duct formed in the shell, and an air outlet of the air duct is formed in the position, close to an opening of the storage chamber, of the shell. A first air guide part is arranged at the end, close to the opening of the storage chamber, of the air outlet, the included angle alpha between the air guide inclined face of the first air guide part and the first direction is an acute angle, and the first direction is the direction opposite to the opening direction of the storage chamber. According to the storage room, the uniformity of cold distribution in the storage room can be improved, and the effects of saving energy and preventing condensation of the door body are achieved.

The utility model discloses an evaporative pipe of inner surface heat exchange relates to refrigeration equipment technical field, the utility model discloses an evaporative pipe main part, heat exchange subassembly, heat conduction board and heat insulating sheet, the inner wall of evaporative pipe main part is fixed with heat exchange subassembly to be annular array, the periphery of evaporative pipe main part is fixed with the connecting piece, and the side of connecting piece away from evaporative pipe main part is fixed with heat insulating sheet, and the periphery symmetry of evaporative pipe main part is fixed with heat conduction board, and heat conduction board is away from heat insulating sheet and sets up, and the length direction of heat conduction board is same with the length direction of evaporative pipe main part.

An ice-making module having a flow-guiding function, relating to the technical field of ice makers. The ice-making module comprises: an evaporator assembly (1), wherein the evaporator assembly (1) is provided with an evaporation tube (12) and a plurality of ice-making cells (11); a flow-guiding plate (2), wherein the flow-guiding plate (2) is fixed on the evaporator assembly (1), the flow-guiding plate (2) is provided with a plurality of through-holes (21) and a plurality of flow-guiding blocks (22), the through-holes (21) are arranged corresponding to the ice-making cells (11), and the flow-guiding blocks (22) are arranged corresponding to the through-holes (21); and a water spray tube (3), wherein the water spray tube (3) is fixed above the flow-guiding plate (2), the water spray tube (3) is provided with a plurality of water spray holes (31), and the water spray holes (31) are arranged corresponding to the flow-guiding plate (2). During ice making, water is introduced from the outside into the water spray tube (3) and is sprayed out from the water spray holes (31). The water flows downward along the surface of the flow-guiding plate (2), accumulates at the top of a through-hole (21) under the action of a flow-guiding block (22), and flows into the interior of an ice-making cell (11) under the surface tension of the water and fills the entire surface of the ice-making cell (11). Part of the water flowing into the ice-making cell (11) freezes into ice, and the unfrozen water flows out from the ice-making cell (11), passes through the next flow-guiding block (22), and then flows into the next ice-making cell (11), until the water flows through the bottommost ice-making cell (11).

The utility model discloses a horizontal type shell pass falling film fluorine evaporation tube pass steam condenser, relates to the technical field of heat pumps, and aims to solve the problems that a fluorine system of an existing horizontal type steam condenser carries liquid when being started, reliable operation of a centrifugal compressor is not facilitated, and a vertical type steam condenser is low in heat exchange efficiency, low in cost and the like. According to the technical scheme, the vertical steam condenser comprises a barrel, the two ends of the barrel are fixedly connected with a first tube plate and a second tube plate respectively, and a plurality of internal and external reinforced efficient heat exchange tubes are fixedly connected between the first tube plate and the second tube plate; and the multiple internal and external reinforced efficient heat exchange pipes penetrate through the interior of the barrel side by side, and two falling film distributor end sealing plates are fixedly connected to the top of the inner wall of the barrel. The effects of being compact in structure, low in cost, higher in heat exchange efficiency and capable of preventing steam from being discharged before condensation are achieved.

The application discloses a regional evaporation duct prediction method based on path loss inversion, and relates to the technical field of maritime communication. A plurality of measured path losses corresponding to a plurality of propagation signals are obtained through a point-to-point microwave propagation link, and the plurality of measured path losses corresponding to the plurality of propagation signals are inverted to obtain long-time evaporation duct heights; the long-time evaporation duct heights and corresponding long-time meteorological and hydrological characteristics are taken as a training sample set to train a recurrent neural network to obtain an evaporation duct height prediction model; the meteorological and hydrological characteristics include a wind speed, an air temperature, a humidity, a sea surface temperature, an evaporation amount, an atmospheric pressure and a rainfall amount; an evaporation duct height prediction value of each grid point in a target region is predicted through the evaporation duct height prediction model; and a continuous regional evaporation duct height distribution is generated through inverse distance weighted interpolation according to the evaporation duct height prediction value of each grid point in the target region. The method improves the prediction accuracy of the regional evaporation duct.

The utility model provides an indoor unit heat exchanger, an indoor unit and an air conditioner, relates to the technical field of air conditioners, and solves the technical problem that no heat exchanger structure matched with an axial flow fan exists. The indoor heat exchanger is a fin type heat exchanger and comprises an evaporation pipe set and heat exchange fins. The heat exchange fins are spirally arranged by taking the center of the indoor heat exchanger as the center; the evaporation pipe set is arranged in the multiple circles of heat exchange fins in a penetrating mode. The heat exchange fins are arranged to be of the spiral structure, air flow spirally flowing at the outlet of the axial flow fan passes through the heat exchanger without hindrance, wind resistance is reduced, and the problem that the flowing direction of the air flow at the outlet of the axial flow fan is not matched with that of the air flow of the heat exchanger is solved. Meanwhile, spiral flowing is beneficial to increasing the actual flowing distance of airflow passing through the heat exchanger, the heat exchange efficiency of the heat exchanger is improved, and the size of the heat exchanger is reduced with the same heat exchange amount; compared with a traditional evaporator, resistance is reduced by 35%, and the heat exchange effect is improved by 40%; the fins of the heat exchanger are integrated, so that the stamping process is reduced.

The invention discloses a gas distribution system and a gas distribution method, and relates to the technical field of gas detection.The gas distribution system comprises an evaporation pipe, a heating part and a gas bag, one end of the evaporation pipe is connected with a background gas storage part, and a liquid injection opening is formed in the pipe wall of the evaporation pipe; the heating part is used for evaporating liquid in the evaporation pipe into a gas state; a mixed gas inlet and a mixed gas outlet are formed in a bag opening of the gas bag, the mixed gas inlet is communicated with the other end of the evaporation pipe, and the mixed gas outlet is communicated with detection equipment through an exhaust pump; a mixed gas inlet valve is arranged at the mixed gas inlet, a mixed gas exhaust valve is arranged at the mixed gas exhaust port, and the gas bag is made of a flexible material and can be shrunk under the action of external air pressure in the exhaust process; the problem that volatile organic compound mixed gas is inconvenient to prepare by adopting a conventional method is solved, low-concentration gas can be flexibly prepared, and the problem that the gas distribution concentration is limited by the flow of a gas flowmeter is solved.

The utility model discloses a kind of topological surface corrugated air conditioner high-efficiency heat exchange evaporation pipes, including evaporation pipe body, the evaporation pipe body is provided with core pipe, the outside of core pipe is fixedly wrapped with heat shrink tube, topological surface is opened in the circumferential inner wall of evaporation pipe body, the inner annular surface of evaporation pipe body is fixedly provided with baffling mechanism. The topological surface corrugated air conditioner high-efficiency heat exchange evaporation pipe, hot medium impact on the narrow part of baffle block, the beam medium is divided into three groups, in turn through baffle block, and pass through multiple groups of baffle block and carry out turbulence blocking, the baffle block of isosceles trapezoidal will main stream be divided into upper center flow, wall flow and lateral flow, form complex vortex system structure behind baffle block, significantly enhance radial mixing;Shunting effect makes fluid constantly scour wall surface, destroy thermal boundary layer, reduce thermal resistance;When fluid passes through multiple groups of baffle block in turn, form disturbance, recovery and again disturbance cycle.

The application relates to a cooling system and method for the upper leakage-stopping ring of a pumped storage unit based on the evaporation heat absorption mode, and belongs to the technical field of hydropower stations. The application comprises a split stacked upper leakage-stopping ring, a temperature sensor, a pipeline, an external circulating cooling system and a control system. The split stacked upper leakage-stopping ring is internally arranged with an evaporation pipeline. A circulating cooling component is communicated with the evaporation pipeline through the pipeline, forming a closed refrigerant circulating loop. The control system is signal-connected with the temperature sensor arranged on the split stacked upper leakage-stopping ring and a variable-frequency compressor in the external circulating cooling system, and is used for controlling the operation of the variable-frequency compressor according to the temperature signal collected by the temperature sensor. Through the construction of an efficient refrigeration circulating system, the application realizes the accurate cooling of the upper leakage-stopping ring, avoids the contact between the cooling water and the runner, improves the operation stability of the unit, and reduces the system cost and energy consumption.

The refrigeration equipment comprises an inner container and an evaporation pipe wound around the periphery of the inner container, a storage chamber is defined by the inner container, the refrigeration equipment further comprises an air duct piece and an air return piece, the air return piece is connected with the inner container and exchanges heat with the inner container, the air duct piece is arranged in the storage chamber and is connected with the air return piece, and an air return duct is defined by the air return piece; the air duct piece is internally provided with an air supply duct and an air return duct, the air supply duct is sequentially communicated with the storage chamber, the effective heat exchange area S heat exchange of the air return piece and the inner container meets the condition that S heat exchange is larger than or equal to 13 / 30 * S chamber minus 0.26, the S chamber is the area of the storage chamber on the plane perpendicular to the first direction, and the unit of the S heat exchange and the unit of the S chamber are both m2; the first direction is the opening direction of the storage chamber. It can be guaranteed that air in the air return duct can exchange enough cold energy with the inner container, and the temperature uniformity of all areas in the storage chamber is improved.

The utility model relates to the field of electrical heat dissipation equipment, in particular to an external heat dissipation device for a high-power switching power supply. Comprising a condenser and a cold plate, the cold plate is of a hollow structure and is vertically arranged, and a power device is installed on the cold plate; a refrigerant is injected into the hollow structure of the cold plate, and the boiling point of the refrigerant is within the temperature control range of the corresponding power device; the upper part of the cold plate is connected with a condensing unit steam inlet at the upper part of the condenser through an evaporating pipe, so that an evaporated refrigerant enters the condenser; the lower portion of the cold plate is connected with a condensation unit backflow outlet in the lower portion of the condenser through a condensation backflow pipe and used for enabling condensed refrigerants to flow back into the cold plate. The cooling efficiency of the phase change heat dissipation device is far higher than that of a traditional air cooling and water cooling heat dissipation mode, the power device with large heat emission can be rapidly cooled in a short time, temperature rise is effectively reduced, the service life of the power device is prolonged, and stable operation of switching power supply equipment is facilitated.

The utility model discloses a flooded evaporator for an R245fa high-temperature heat pump unit, relates to the technical field of high-temperature heat pumps, and aims to solve the problems that the improvement of the energy efficiency of a high-temperature heat pump unit system is limited due to lower heat transfer efficiency of an existing dry-type evaporator, and the heat transfer efficiency is low. In order to solve the problems that the reliable operation of a compressor and the performance of a heat pump system are affected due to the fact that the superheat degree of a working medium outlet of an ordinary flooded evaporator is small or no superheat degree exists in the working medium outlet of the evaporator, return air of the compressor carries liquid or a liquid working medium is condensed in the compression process, and the reliable operation of the compressor and the performance of the heat pump system are affected. A first tube plate and a second tube plate are fixedly connected to the two ends of the outer side of the barrel respectively, a supporting plate is fixedly connected to the center of the interior of the barrel, a supporting plate pull rod is fixedly connected to the interior of the supporting plate, and an overheating heat exchange tube and a flooded evaporation tube are installed between the first tube plate and the second tube plate; and a liquid homogenizing plate is fixedly connected to the other side of the interior of the cylinder body. And the effects of improving the energy efficiency and realizing reliable performance are achieved.

Provided is a backflow combustor for a gas turbine provided with a rotary shaft having an axis extending in the axial direction, said backflow combustor comprising: an outer liner and an inner liner that both extend about the axis and that both have a ring shape; an end liner that is disposed on one side of both the liners in the axial direction, that connects the outer liner to the inner liner, and that has a ring shape; a combustion chamber that is defined by these liners; and an evaporation tube that is connected to the outer liner, that is disposed in the combustion chamber, and that evaporates fuel in an internal flow path communicating with an opening of the outer liner into which a fuel injector is inserted. A tip end part of the evaporation tube positioned on the opposite side from the opening side of the outer liner in the internal flow path is connected to a specific liner.

The utility model relates to the field of defrosting of refrigeration equipment, in particular to an evaporation core. The evaporation core body is used for solving the problem that an existing evaporation core body is large in wind resistance. The evaporation core body comprises an evaporation pipe, a heating rod and heat dissipation fins arranged in parallel at intervals, each heat dissipation fin is correspondingly provided with multiple rows of through holes, the arrangement direction of each row of through holes is parallel to the airflow direction, the through holes comprise pipe passing holes allowing the evaporation pipe to penetrate through and rod passing holes allowing the heating rod to penetrate through, and the heat dissipation fins are arranged in the pipe passing holes. The evaporation pipes are sequentially connected in series to form a refrigerant flow channel, and an air passing channel is formed between every two adjacent rows of evaporation pipes. And the heating rods in the same row as the evaporation pipes do not influence the air passing of the air passing channel. In this way, the air resistance generated when the evaporation fan blows air is reduced, and the defrosting efficiency of the evaporation core is improved.