501results about "Storage heaters" patented technology

According to the rural air conditioning device, coal or biomass straw is adopted as fuel, the energy storage technology is combined, flue gas waste heat generated by a kitchen range device is efficiently recycled and stored, the stored energy is used for dragging an absorption type refrigerating device to be used for refrigerating and heating air, and an adopted regenerator can flexibly adjust the operation mode and is used for peak clipping and valley filling; the energy-saving kitchen range is used for refrigerating, heating or drying clothes, the power consumption is low, the comprehensive heat utilization efficiency of the kitchen range is greatly improved, the market application space is obvious, and the expected economic, social and environment-friendly benefits are remarkable.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. The delivered heat which may be used for processes including power generation and cogeneration. In one application, the energy storage system provides higher-temperature heat to a conventional lower-temperature heat source to boost the temperature of a thermal power cycle working fluid to a turbine, thereby increasing efficiency of the power cycle.

The utility model discloses a composite high-voltage solid heat storage electric boiler, and relates to the field of electric boilers. A composite type high-voltage solid heat storage electric boiler comprises a boiler cabinet and further comprises an installation cavity, a heat storage cavity, a heat storage cavity and a heat storage cavity, the bearing plates are fixedly connected to the inner wall of the mounting cavity at equal intervals; the solid heat storage bricks are placed on the bearing plate; the connecting rod is connected into the mounting cavity in a sliding mode, and a plurality of fixing blocks used in cooperation with the bearing plate are fixedly connected to the connecting rod at equal intervals; according to the utility model, through the cooperation of the pressurizing pipe, the piston disc, the connecting rod and the fixing block, the solid heat storage brick can be preliminarily fixed, and the heat conduction rod conducts heat in the mounting cavity to the sleeve, so that gas in the sleeve is heated and expanded to increase air pressure, and the clamping force of the fixing block on the solid heat storage brick is further increased; the fixing stability of the solid heat storage brick in the working process is effectively improved, looseness caused by factors such as vibration is reduced, and stable operation of equipment is guaranteed.

The utility model discloses photovoltaic direct-drive type heat storage heating equipment, and relates to the technical field of heating devices. The utility model provides photovoltaic direct-drive type heat storage and heating equipment which comprises a shell, a heat storage device and a heat supply device. The heating piece is arranged in the containing cavity, and a heat storage piece is arranged on the periphery of the heating piece; wherein a first air layer is arranged between the heat storage part and the top wall of the shell, and a second air layer communicated with the first air layer is arranged between the heat storage part and the bottom wall of the shell; the top wall of the shell is provided with an air outlet communicated with the first air layer, and the bottom wall of the shell is provided with an air inlet communicated with the second air layer; and the size of the air outlet is adjustable, so that heat generated by the heating piece can be selectively led out from the air outlet or heat the heat storage piece.

The utility model relates to the technical field of workshop temperature control, in particular to a heating fan and a temperature control workshop, the heating fan comprises a pipe body, an air supply device and a heating device which are coaxially arranged, the air supply device and the heating device are contained in the pipe body, and the heating device is arranged at the air outlet end of the air supply device; the heating device comprises a heating pipe, the heating pipe is connected to the side wall of the pipe body in the radial direction of the pipe body and arranged in an air outlet area of the air supply device in a coiled mode, a heating medium and an electric heating wire are arranged in the heating pipe, and the two ends of the electric heating wire are connected with wiring ends at the two ends of the heating pipe respectively. According to the heating fan, heat is generated by adopting an electric heating oil mode and is transferred through the fan, in the process, heat loss is small, the heat efficiency is high, meanwhile, operation is easy and reliable, and the heating fan can also be suitable for multi-purpose application scenes.

The invention discloses an induction heating molten salt energy storage system with controllable distribution of large-plane plate-level eddy current, which comprises a salt storage tank, one end of the salt storage tank is connected with a heating device, and the other end of the salt storage tank is connected with a thermoelectric conversion device. The invention further discloses a design method of the induction heating molten salt energy storage system with the large-plane plate-level eddy current controllable distribution. The design method comprises the steps of designing the total heating power Ptotal, designing the total eddy current power Peddy of the metal heating plate and designing the molten salt flow Qv in unit time. The problems that the vortex area is small, distribution is uncontrollable, the molten salt heating temperature is uneven, and the heating efficiency is low are solved.

The invention relates to the technical field of water heaters, in particular to a water heater energy storage control method, a controller and a water heater, and the energy storage control method comprises the steps that in at least part of the process of storing energy for a phase change material, a heating device is controlled to work at a first preset return difference, and a second preset return difference is controlled to work at a second preset return difference; and then the heating device is controlled to work at a second preset return difference, the second preset return difference is smaller than the first preset return difference, and the preset return difference is the difference value between the stopping temperature when the heating device stops working and the starting temperature when the heating device starts working. By controlling the heating device to work intermittently at different temperature return differences, the local overheating phenomenon caused by heating of the phase change material in the inner container can be reduced, and / or the energy storage time can be shortened.

The invention discloses a solid heat storage boiler, and relates to the technical field of ocean sampling, the solid heat storage boiler comprises a heat insulation box, a partition plate is arranged in the heat insulation box, the partition plate divides the interior of the heat insulation box into a heat storage bin and a heat exchange bin, an air duct is arranged in the heat storage bin, a heat storage brick is arranged in the heat storage bin, and a heating wire is arranged in the heat storage brick. A plurality of sets of heat exchange pipes are arranged in the heat storage bin, the circulating motor injects water into the heat exchange pipes, the electromagnetic valve close to one side of the water inlet tank is closed after injection is completed, the heat storage bin and the heat exchange bin are arranged in the heat storage bin, an air duct opening is formed between the heat storage bin and the heat exchange bin, a frame body is arranged in the heat exchange bin, and heat exchange pipes are arranged at the end of the frame body. According to the solid boiler, heat exchange is conducted on water in the heat exchange pipe through the air duct, the heated water flows into the water outlet tank to be temporarily stored and used, and therefore the purpose that hot water service is continuously provided without a water storage tank can be achieved, and the occupied area of the solid boiler is reduced.

The invention discloses a coal-fired unit deep peak shaving system coupled with electric heating high-temperature phase change heat storage, and relates to the technical field of power generation. The matching capacity of the heat storage system and the full-working-condition operation parameters of the high-parameter coal-fired unit can be effectively enhanced, so that the deep peak regulation capacity and the variable load rate of the coal-fired unit are improved, meanwhile, the energy density, the electricity-heat conversion efficiency and the economic benefits of the heat storage device are improved, and the unit can be prevented from running in an over-low load mode so as to improve the efficiency and prolong the service life. The coal-fired unit deep peak shaving system comprises a coal-fired unit and a high-temperature phase change heat storage system. According to the invention, the peak regulation flexibility of the coal-fired unit is improved, the energy density, the electricity-heat conversion efficiency and the economic recovery period of the heat storage device are also improved, and the over-low load operation of the unit can be prevented so as to improve the efficiency and the service life.

The utility model discloses a grouting device for building construction, which belongs to the technical field of building construction and comprises a bottom plate, moving wheels are arranged at four corners of the bottom of the bottom plate, a push handle is fixedly connected to one side of the bottom plate, a grouting mechanism is arranged at the top of the bottom plate and comprises a conveying hose, and a storage box is arranged behind the grouting mechanism. An opening and closing door is hinged to the rear side of the storage box, a feeding hole is formed in the side wall of the storage box, a winding assembly and a heating assembly are arranged in the storage box, the winding assembly is used for storing the conveying hose, the heating assembly is used for heating the conveying hose, and the conveying hose is prevented from being too hard. The device has the beneficial effects that the storage box is arranged, the heating assembly is arranged in the storage box, the conveying hose is heated through the heating assembly, and the situation that the conveying hose becomes hard in winter and is inconvenient to wind and release is avoided.

The utility model relates to the technical field of blankets, and discloses a blanket with a constant temperature function, which comprises a water inlet pipe arranged outside the blanket and a water bag arranged inside the blanket, and the water inlet pipe is connected with the water bag; the pump body is arranged on the water inlet pipe, and the output end of the pump body is connected with the water inlet pipe; the heating frame is arranged at the input end of the pump body; the water outlet pipe is arranged between the blanket and the heating frame in a penetrating manner; the heating blocks are symmetrically arranged on the inner side wall of the heating frame; and the liquid inlet pipe penetrates through the top of the heating frame. The pump body and the heating block are controlled to be started, the heating block heats a water source in the heating frame to a set temperature, the heated water is conveyed into the water bag in the blanket by the pump body, the effect that the surface of the blanket is at a constant temperature is achieved, and meanwhile water heat in the water bag in the blanket is drained back to the heating frame through the water outlet pipe after being lost and is heated again through the heating block. Therefore, constant-temperature water circulation is achieved, and the constant-temperature effect of the blanket can be conveniently and continuously achieved.

The invention discloses a heat supply system, method and equipment based on chemical looping electricity storage. The heat supply system comprises an energy storage unit and an energy release unit which achieve energy coupling through a metal-oxygen carrier exchange system. The energy storage unit comprises a heat pump assembly, a reduction reactor and a first heat exchange assembly, the heat pump assembly and the reduction reactor are both connected with the first heat exchange assembly, and water flowing through the heat pump assembly exchanges heat with oxygen discharged by the reduction reactor through the first heat exchange assembly; the energy release unit comprises an oxidation reactor and a second heat exchange assembly, the oxidation reactor is connected with the second heat exchange assembly, and water flowing into the second heat exchange assembly exchanges heat with flue gas discharged by the oxidation reactor. By combining a chemical looping electricity storage technology with a heat supply system, electric energy is converted into high-density chemical energy by using a reduction reactor and stored in a metal oxygen carrier in the period of sufficient green electricity; and during the period of insufficient green power, chemical energy stored in the metal oxygen carrier is released by using the oxidation reactor and is used for producing hot water or steam. According to the system, cross-time-space conversion and flexible scheduling among electric energy, chemical energy and heat energy are achieved, so that the comprehensive utilization efficiency of energy and the heat supply reliability are improved, and meanwhile the operation cost is reduced.

The utility model provides a cloth bag anti-condensation assembly of a pulse bag-type dust collector, which relates to the technical field of pulse bag-type dust collectors, and comprises a heating shell, a mounting shell is mounted at the top of the heating shell, an air source dispersing assembly is mounted at the top of the mounting shell, and the dispersing assembly is used for dispersing an introduced air source. The air source dispersing assembly comprises a fixing box, mounting rods, a driving motor and dispersing blades, the fixing box is mounted at the top of the mounting shell, the mounting rods are symmetrically mounted in the fixing box, the driving motor is fixed to one end of each mounting rod, and the dispersing blades are mounted at the output end of the driving motor. After the driving motor is electrified, electric energy is converted into kinetic energy, so that the dispersing blades at the output end are driven to rotate at a high speed, air entering the air source is dispersed through the dispersing blades, the interior of the heating shell can be filled with the air source for heating, and the heating uniformity of the air source is higher.

An ablutionary system having a means configured to receive a water supply 107 and operable to provide a principle stream 109 at a controlled temperature, wherein the means includes a thermal battery 1

The application discloses a kind of intelligent gas mould temperature controller, including cabinet, the workspace is equipped in the cabinet, heating furnace is equipped in the workspace, heating space is formed in the heating furnace, heated pipeline is fixedly equipped in the heating space, rotating ring is fixedly equipped in the periphery of the heating furnace, control motor is equipped in the side of the rotating ring, as a kind of intelligent gas mould temperature controller, by setting rotatable heating furnace, in system initial heating stage, using rotating heating furnace, the flow rate of heat conducting oil in system is accelerated, while ensuring that heated pipeline is heated evenly in heating furnace, can substantially reduce the time consumption of initial heating stage, improve heating efficiency;The heating furnace of the application rotates in work, will not affect the stable operation of igniter and furnace end, and the pipeline connected with the heating furnace when rotating all pass through reasonable layout, so that the axis of rotating ring and the rotating shaft of heating furnace coincide, no movement interference occurs, and the system can run smoothly.

The invention relates to the technical field of heat storage and energy supply, and discloses a cascade temperature zone regulation type solar energy-valley electricity complementary heat storage and energy supply system and method.The system comprises a mirror field heat collection system, a circulating oil tank and a high-temperature solid heat storage and heat exchange system, and a heat accumulator chamber of the high-temperature solid heat storage and heat exchange system comprises a plurality of heat storage sections; the materials of the heat storage bodies of different heat storage sections are different, and each heat storage section is connected with an independent inert gas circulation module and an independent electric heater; the mirror field heat collection system is used for gathering solar radiation energy and transmitting heat energy generated by the solar radiation energy to the circulating oil tank; the circulating oil tank distributes heat energy to each heat storage section; the high-temperature solid heat storage and exchange system stores heat energy through heat accumulators in all energy storage sections and outputs the heat energy in a heat accumulator chamber through an inert gas circulation module. And the electric heater converts electric energy into heat energy and stores the heat energy to each heat storage section. According to the invention, double breakthrough of heat storage density and temperature upper limit is realized, and different requirements can be met.

The utility model discloses an aluminum alloy panel electric fireplace with a temperature control function, which comprises an electric fireplace body, a heating element used for heating is arranged at the inner bottom of the electric fireplace body, and heat dissipation grooves used for heat dissipation are arranged at the left end and the right end of the front end of the electric fireplace body. A temperature display controller for adjusting the temperature is installed at the upper end of the front end of the electric fireplace body, a water bin for controlling liquid to flow is installed at the top of the electric fireplace body, and a water injection opening for injecting liquid is formed in the middle of the top of the water bin. According to the aluminum alloy panel electric fireplace with the temperature control function, more stable heat release can be provided by controlling liquid heating and circulating flowing, then indoor air circulation can be achieved by controlling operation of a draught fan, and therefore air can be rapidly distributed to a whole room, meanwhile, heat can be effectively stored through liquid, and the temperature control function is achieved. And heat is prevented from being quickly dissipated, so that the set temperature is quickly reached.

The utility model discloses a water heating blanket host machine of leakproof explosion-proof jar relates to water heating blanket host machine technical field, the utility model discloses a water heating blanket host machine, the utility model discloses a water heating blanket host machine of leakproof explosion-proof jar, the utility model discloses a water heating blanket host machine of leakproof explosion-proof jar, the water heating blanket host machine of leakproof explosion-proof jar relates to the water heating blanket host machine technical field, the utility model discloses a heat preservation shell, the bottom outer wall of heat preservation shell is fixedly connected with a base, the outer wall of heat preservation shell is provided with a circulation mechanism, the circulation mechanism The rubber blocks are arranged, the insection cover is rotated to drive the water inlet pipe connected with the insection cover to be connected with the funnel, then the rotary knob is rotated to drive the threaded rod connected with the rotary knob to rotate, the rubber blocks connected with the outer wall of the threaded rod can slide along the threaded rod and block the water inlet pipe, and the connecting ring is rotated to drive the connected positioning ring to rotate. The clamping block is pushed to slide along the positioning hole, the water outlet pipe is taken away from the positioning ring to be replaced, the water inlet pipe is blocked through the rubber block, the water outlet pipe is replaced by rotating the connecting ring, and the situation that the heating efficiency is reduced due to the fact that the water inlet and the water outlet pipe are used for a long time is prevented.

Thermal energy storage systems are disclosed in this application. Systems of the inventive subject matter are designed to reduce maintenance requirements by sequestering, for example, corrosive fluids that might otherwise damage difficult-to-fix internal components are kept out of those components by introducing a non-corrosive heat transfer fluid to facilitate heat transfer between a thermal energy storage medium (e.g., molten sulfur) and a potentially corrosive working fluid. Thus, the potentially corrosive fluid is kept out of a thermal energy storage tank containing the thermal energy storage medium, which, by design, is difficult to repair when internal components corrode or otherwise require maintenance.

The utility model provides a constant-temperature water bath box for film flushing and a film flushing machine. The constant-temperature water bath box comprises a box body, a control assembly and a refrigeration module. The box body comprises a containing groove used for containing a temperature conduction medium. And at least part of the liquid medicine tank containing the liquid medicine can be immersed in the temperature conducting medium. The control assembly comprises a shell and a main control board arranged in the shell. The shell is at least partially contained in the containing groove. The refrigeration module is electrically connected with the electric control board. The refrigeration module is arranged on the peripheral wall corresponding to the containing groove, and the refrigeration module can generate cold energy after being powered on so as to conduct the cold energy to the temperature conduction medium through the peripheral wall, so that the temperature of the temperature conduction medium is reduced. According to the constant-temperature liquid heating machine, the temperature of liquid medicine such as developing liquid and fixing liquid contained in the liquid medicine tank is reduced in a mode similar to water bath cooling, and therefore the temperature of the liquid medicine is controlled. Compared with manual control of the temperature of the liquid medicine, the liquid medicine temperature control device is convenient and safe to operate.

The present invention relates to an electric heater for providing process heat by electrically heating a gaseous fluid stream to a temperature of 1000 DEG C or higher. The electric heater includes a heating chamber having a gas inlet configured to provide a flow of gaseous fluid into an interior of the heating chamber and a gas outlet configured to provide a flow of gaseous fluid having a temperature exceeding 1000 DEG C to the exterior of the heating chamber. The electric heater also includes a first heating stage housed in the heating chamber. The first heating stage includes one or more first active ceramic resistive heating elements arranged and configured to generate heat having a first temperature of 1000 DEG C or higher upon application of an electrical current to the one or more first active ceramic resistive heating elements. Furthermore, the first heating stage comprises at least one passive thermal element arranged and configured to passively heat the gaseous fluid stream to a temperature of 1000 DEG C or higher, and / or for storing heat generated by the one or more first active ceramic resistive heating elements.

The utility model relates to the technical field of glass adhesive, and discloses a glass adhesive heating device which comprises a heating box, a top cover is rotatably connected to the rear side of the top end of the heating box, a supporting plate is fixedly connected to the inner wall of the heating box, a plurality of sleeves are fixedly connected to the inner wall of the supporting plate, glass adhesive pipes are arranged on the inner walls of the sleeves, and the glass adhesive pipes are fixedly connected to the inner wall of the heating box. Connecting plates are slidably connected to the two sides of the inner wall of the supporting plate, lifting assemblies are arranged at the bottom ends of the connecting plates, heating pipes are fixedly connected to the inner wall of the bottom end of the heating box, and fixing assemblies are arranged on the two sides of the inner wall of the supporting plate. According to the glass cement pipe heating device, water in the heating box is heated by adding water into the heating box and arranging the heating pipe, so that the glass cement pipe is conveniently and uniformly heated, the condition that the heating is not uniform by using tools such as a blower is avoided, and the glass cement pipe can be lifted by the arranged lifting assembly, so that the bottom of the glass cement pipe is conveniently heated.

The invention relates to a system (30) having at least one heating element (8, 12, 36, 38, 40, 52) and having at least one thermocouple (10, 54), wherein the at least one heating element (8, 12, 36, 38, 40, 52) is designed to heat a fluid (4, 32) that flows through past the at least one heating element (8, 12, 36, 38, 40, 52), the system being characterized in that the at least one thermocouple (10, 54) is electrically conductively connected to the at least one heating element (8, 12, 36, 38, 40, 52). Also described are a device (2) for heating a fluid (4, 32) and a use of a thermocouple (10, 54) for monitoring the temperature of a heating element (8, 12, 36, 38, 40, 52).

The application discloses a heat-accumulating type steam and hot water cogeneration waste heat boiler system, which comprises a waste heat boiler body, a heat-accumulating type heat medium water system and related control valves. The waste heat boiler can absorb waste heat of flue gas to obtain hot water with different temperatures. Steam generated by vaporization and separation of superheated water in a steam drum can enter a steam pipe network after being heated by a heater to supply high-temperature users. Water with low enthalpy can be output by the heat-accumulating type heat medium water system to supply production and living hot water required by low-temperature users. The hot water is pumped back to the waste heat boiler body by a hot water circulating pump / booster after being cooled, and is heated by low-temperature flue gas, so that the exhaust gas temperature of the waste heat flue gas is further reduced, and the utilization efficiency of the waste heat is improved. The application realizes steam and hot water cogeneration functions of the waste heat boiler, outputs high-quality steam, and outputs high-temperature hot water with required temperature and pressure of users, and has simple control, high stability and high precision, and meets the requirements of fine production and life.

The utility model is suitable for the technical field of water supply, and discloses a waterway board and a water supply device. Wherein the waterway plate comprises a first pipeline, a second pipeline, a first valve body and a second valve body, the first pipeline extends in the first direction and is used for communicating with a water using end, at least part of the second pipeline extends in the second direction and stretches across the first pipeline, and the second pipeline is used for communicating with the first pipeline and water needing equipment. The first valve body is used for controlling on-off of the first pipeline, and the second valve body is used for controlling on-off of the second pipeline. The first valve body and the second valve body are both connected to the first pipeline and are adjacently arranged in the first direction. According to the waterway board, the compactness of the arrangement of the valve body is improved, and the occupied space of the waterway board can be reduced.

The present application relates to molten salt energy storage heating technical field, specifically to 6kV large power stepless power regulating molten salt energy storage electric heating system, including the following steps, data collection is carried out to different levels of molten salt energy storage architecture, respectively using space-time feature extraction function extracts the short-time feature, long-term trend feature and spatial correlation feature of molten salt energy storage architecture data, and according to the distribution difference of the data characteristics of different levels of molten salt energy storage architecture, the adaptive fusion of data is carried out by using hierarchical adaptive clustering algorithm;Based on the adaptive fusion result, the hierarchical network structure is used for intelligent analysis of molten salt energy storage architecture hierarchical partitioning, including, level judgment and partition determination of molten salt energy storage architecture data, according to the intelligent analysis result, the state transition matrix is constructed to identify the potential abnormality of molten salt energy storage architecture;According to the data of different levels of molten salt energy storage architecture, the running state of each level is analyzed, and intelligent optimization decision and control execution are carried out based on abnormal characteristics and global influence.

The utility model discloses a heat tank and a water supply device.The heat tank comprises a heat tank body, a heat exchange medium cavity of a hollow structure is formed in the heat tank body, and the heat exchange medium cavity is used for storing a heat exchange medium; the extraction pipe extends into the heat exchange medium cavity, the end of the extraction pipe is located at the top of the heat exchange medium cavity, and the extraction pipe is used for extracting an upper-layer heat exchange medium in the heat exchange medium cavity; the return pipe extends into the heat exchange medium cavity, the end of the return pipe is located in the middle or at the bottom of the heat exchange medium cavity, the return pipe is used for returning a heat exchange medium to the heat exchange medium cavity, the heat tank body comprises a heat exchange cylinder and two end covers, the two end covers are fixedly arranged at the two ends of the heat exchange cylinder respectively, and the two end covers are arranged in the heat exchange cylinder. And the two end covers and the heat exchange cylinder jointly enclose to form the heat exchange medium cavity, so that the heat energy utilization rate of the hot tank is increased, and energy waste is reduced.

The utility model discloses an aviation fuel heating system for a high temperature fuel dynamic seal test, which comprises a dynamic seal test cavity, a water cooling device, a conduction oil mold temperature controller and a control terminal, a conduction oil heat exchange tube and aviation fuel are arranged in the dynamic seal test cavity, the top of the dynamic seal test cavity is provided with an air inlet valve and an exhaust valve, and the air inlet valve and the exhaust valve are communicated with the conduction oil mold temperature controller. A first temperature sensor is installed on the dynamic seal test cavity, the water cooling device is connected with the heat conduction oil mold temperature controller and used for cooling heat conduction oil in the heat conduction oil mold temperature controller, and the heat conduction oil mold temperature controller is connected with the heat conduction oil heat exchange pipe and used for adjusting the temperature of aviation fuel through the heat conduction oil. And the control terminal is connected with the water cooling equipment, the heat-conducting oil mold temperature controller and the first temperature sensor. The aviation fuel oil heating system for the high-temperature fuel oil dynamic seal test is high in safety, and long-term stable control over the temperature of high-temperature fuel oil can be achieved.

A combination heating system and method, including a combustion chamber, a combustion heat exchanger receiving heat from the combustion chamber, and a thermal storage reservoir. The combustion heat exchanger includes first fins extending outward from the combustion heat exchanger, and at least some of the first fins may have a profile that is at least partially curved or S-shaped. The thermal storage reservoir has an outer wall and an inner wall, and may contain a fluid such as glycol between the outer wall and the inner wall. The inner wall forms a hollow passageway through which the combustion heat exchanger extends. The thermal storage reservoir also includes second fins extending inward from the inner wall toward the combustion heat exchanger. The first fins interdigitate with the second fins in a spaced-apart manner such that airgaps exist between adjacent interdigitated ones of the first fins and the second fins.