3670results about "Corrosion prevention" patented technology

The invention discloses a defrosting control method and device, refrigeration equipment and a storage medium, and belongs to the technical field of defrosting. According to the defrosting control method, in the first stage, the heater is controlled to defrost the evaporator; entering a second stage when the defrosting state of the first stage meets a first condition; and in the second stage, a compressor exhaust pipe of the refrigerating system is controlled to communicate with the evaporator to conduct hot gas defrosting, and when hot gas defrosting is conducted under the first condition, the heat exchange medium flowing out of the evaporator is in a gaseous state. According to the defrosting control method disclosed by the invention, the heater is firstly controlled to defrost, and then the compressor is controlled to defrost by hot gas, so that staged defrosting is realized; the defrosting state of the first stage is controlled, so that the surface temperature of the evaporator is not too low when hot gas defrosting is carried out, heat exchange media flowing out of the evaporator are prevented from being liquefied, and liquid impact is prevented; and meanwhile, the heater is turned off in the second stage, and excessive heat generated by the heater can be prevented from overflowing to the compartment.

A ventilation system including a ventilator; and an outdoor unit, wherein the ventilator includes a housing including a first intake, a second intake, a first outlet and a second outlet, a plurality of dampers to change flow paths of air flowing through the housing, first and second air blowers, a heat exchanger in the housing, and a processor to control the dampers and first and second air blowers to form a first flow path in which outside air flows through the heat exchanger, or form a second flow path in which room air flows through the heat exchanger, to thereby form a flow path in the ventilator, while air flows through the flow path, control the outdoor unit to form frost on the heat exchanger, and control the outdoor unit to stop operating based on a preset frosting termination condition so that the frost melts to clean the heat exchanger.

The invention relates to the technical field of coalification black water treatment, and particularly discloses a coal gasification black water flash steam waste heat steam turbine gradient utilization system which comprises a black water flash steam turbine module and a steam exhaust condensation module. The black water flash steam turbine module comprises a high-pressure flash evaporator, a low-pressure flash evaporator, a vacuum flash evaporator, a supplementary condensing steam turbine, a generator and a settling tank, and a water outlet of the vacuum flash evaporator is connected with the settling tank; the steam exhaust condensation module comprises an evaporative condenser and a condensate pump. Through the design of the scale scraping and water uniformizing piece, part of cooling water falling around the heat exchange coil from top to bottom falls on the water uniformizing plate to drive the water uniformizing plate to rotate, when the water uniformizing plate rotates, water on the water uniformizing plate is thrown out under the action of centrifugal force, cooling water without heat exchange can be uniformized to other heat exchange pipes for heat exchange, and the heat exchange efficiency is improved. Therefore, the cooling water flows more uniformly among the heat exchange coils, the utilization rate of the cooling water is improved, and the heat exchange efficiency is improved.

The invention discloses a flue gas waste heat recovery device and method for a garbage incinerator. Relates to the technical field of waste incineration treatment and comprises a waste heat recovery box, a heat exchange pipe set driven by a main control gear, a transfer gear and a fixed gear ring is arranged in the waste heat recovery box, and heat exchange pipes conduct revolution and autorotation in smoke at the same time to enhance heat exchange. Accumulated dust on the outer surface of the heat exchange tube is removed through the rotating treatment scraper and the removing brush cylinder, and the reciprocating treatment kettle is used for knocking the tube wall of the heat exchange tube to shake off the dust; the flow speed and the flow direction of flue gas can be intelligently adjusted through an angle-adjustable speed adjusting plate on a treatment scraper, so that the device is suitable for different working conditions; the device realizes efficient and stable recovery of flue gas waste heat, can keep a heat exchange surface clean on line, and is high in adaptability.

The refrigeration house condenser waste heat recovery energy-saving system comprises a refrigeration module, the refrigeration module is connected with a first heat energy recovery module, and the first heat energy recovery module is connected with a user side; the refrigeration module comprises a compressor, a first condenser, a first expansion valve and a first evaporator, the compressor is communicated with the first condenser, the first condenser is communicated with the first expansion valve, the first expansion valve is communicated with the first evaporator, and the first evaporator is communicated with the compressor; the first heat energy recovery module comprises a first water pump and a first adjusting valve connected with the first water pump in parallel, and the first adjusting valve and the first water pump are connected with a water supply source and communicate with the first condenser. The first condenser is connected with a second regulating valve, the second regulating valve is respectively communicated with one end port of a third regulating valve and one end port of a fourth regulating valve, the third regulating valve is communicated with the first condenser, and the fourth regulating valve is connected with a user side. The system improves the utilization rate of primary energy in the operation process of the refrigeration house.

A condensate water treatment system of a refrigeration type range hood comprises a compressor, an indoor unit module, an outdoor unit module and a water storage box, the indoor unit module comprises an evaporator and an indoor unit fan, the indoor unit fan is provided with a volute and an impeller, an indoor unit water pan is arranged below the evaporator, and a water outlet is formed in the bottom of the indoor unit water pan. An inlet of the three-way valve is communicated with the water outlet, a first outlet of the three-way valve is communicated with the water inlet end of the purified water inlet pipe, a second outlet of the three-way valve is communicated with the water inlet end of the sewage inlet pipe, and the water storage box is divided into a purified water area and a sewage area. The water outlet end of the purified water inlet pipe is communicated with the purified water area, and the water outlet end of the sewage inlet pipe is communicated with the sewage area. According to the condensate water treatment system of the refrigeration type range hood, self-cleaning of the evaporator and cleaning of the fan impeller of the inner machine can be conducted, and sewage generated after self-cleaning flows into the sewage area of the water storage box through the sewage pipe and is prevented from being mixed with clean condensate water in the clean water area.

According to the heat exchanger core body based on the composite three-period minimal curved surface structure and the design method, the advantages of various TPMS structures are integrated, and the balance of efficient heat exchange, low flow resistance and scaling prevention is achieved. The heat exchanger core body based on the composite three-period minimal curved surface structure is formed by combining at least two different three-period minimal curved surface (TPMS) unit structures in space, the TPMS unit structures of the heat exchanger core body in the fluid flowing direction are arranged in a partitioned mode, a Gyandroid structure with small pressure drop is adopted in a fluid inlet area, and the Gyandroid structure with small pressure drop is adopted in a fluid outlet area. A Diamond structure for enhancing heat exchange is adopted in a main body heat exchange area, and a Gyandroid structure with small pressure drop is adopted in an outlet area. The TPMS structure integrates the advantages of various TPMS structures, has a complex three-dimensional curved surface and a larger effective surface area, can better exchange heat with fluid, effectively optimizes fluid flow and reduces flow resistance, and the TPMS structure has the anti-scaling capacity by combining the smooth continuous curved surface characteristic with the surface treatment technology.

The invention provides a heat pump non-stop defrosting control method and system based on double-evaporator cooperative control, and the method comprises the steps: building a temperature difference response change rate index by collecting the refrigerant inlet and outlet temperatures of two groups of fin heat exchangers in real time, and recognizing a side needing to be defrosted and a heating side; an electronic expansion valve, a fan and an electromagnetic valve are dynamically configured, so that the side needing to be defrosted enters a static defrosting mode, and the heating side continuously supplies heat; the frequency rising of the compressor and the switching of the four-way valve are cooperatively adjusted, and small-flow pre-balancing is executed before reversing so as to restrain pressure impact; and after defrosting is completed, it is judged that defrosting is finished based on the thermal response state and the heat change trend, the side needing defrosting is controlled to be reset, and heating is started again. Uninterrupted heat supply of the user side in the defrosting process is achieved, water temperature fluctuation and energy consumption are remarkably reduced, and the operation stability and energy efficiency of the heat pump in the low-temperature and high-humidity environment are improved.

The invention provides an air source heat pump system. The air source heat pump system comprises a compressor, a fin heat exchanger, a shell tube heat exchanger and a gas-liquid separator, wherein the shell tube heat exchanger comprises a gas tube, a liquid tube, a heat exchange tube and a liquid separating device, the air source heat pump system further comprises a four-way valve, the four-way valve is correspondingly communication with the compressor, the gas-liquid separator, the fin heat exchanger and the gas pipe, the fin heat exchanger is in communication with the liquid separating device through a orifice plate and a first one-way valve; the fin heat exchanger is in communication with the liquid tube through an expansion valve and a second one-way valve; the first one-way valve is used for the one-way conduction of the fin heat exchanger to the liquid separating device; the second one-way valve is used for the one-way conduction of the liquid pipe to the fin heat exchanger. By the adoption of the system, a liquid storage device of the liquid refrigerant does not need to be added in the system, so that the cost is saved; a large amount of liquid refrigerant cannot flow back to the compressor after defrosting is finished; during the refrigeration mode, the refrigerant running shell pass does not need to be subjected to suction superheat, so that the air suction pressure and the operation efficiency of the refrigeration mode are improved; and the overall use valve of the system is less, and the reliability is high.

A condensate water treatment system of a refrigeration type range hood is characterized in that in a condensate water receiving box on an evaporator, water in the water receiving box is conveyed to a condenser, water flowing back from the condenser flows back to the water receiving box through a water return pipe, the condensate water treatment system further comprises a cooling fan, a steam generator and a spraying pipe, the condenser is arranged on the upstream of the cooling fan in the air flowing direction, and the steam generator is arranged on the water receiving box. The spraying pipe is arranged in an air channel between the air outlet side of the condenser and the air inlet of the cooling fan, a steam outlet of the steam generator is communicated with an inlet of the spraying pipe, and a shutter grating with adjustable blade opening angles is installed on the air inlet side of the condenser. According to the condensate water treatment system of the refrigeration type range hood, air conditioner condensate water is adopted to clean the condenser, external water can be heated through the steam generator to generate high-temperature steam, the high-temperature steam is sprayed out of the spraying pipe to clean the condenser, and according to different working modes, the condensate water treatment efficiency is improved. And the opening angle of the blades of the shutter grille can be adjusted, and the intelligent degree is high.

The invention provides a strong brine zero-discharge circulating cooling water high-salt operation method and system. The method comprises the following steps: S1, pretreating high-efficiency membrane softening produced water and controlling a shunting dynamic ratio; s2, variable parameter closed-loop control and energy consumption optimization of the water supplementing system; s3, multi-variable cooperative regulation and evaporation efficiency improvement of the circulating water system; s4, dynamically adding the high-salt scale and corrosion inhibitor and controlling the uniformity of a concentration field; s5, multi-dimensional data fusion and intelligent decision making of the online detection system; s6, carrying out dynamic flow regulation and energy recovery on the sewage discharge system; s7, carrying out self-adaptive backwashing and efficiency monitoring on the sewage filtering system; s8, double-circulation temperature difference matching and anti-scaling control of the closed cooling system are carried out; s9, simulating multi-working-condition corrosion monitoring and data inversion of the heat exchanger; s10, carrying out the digital twinborn modeling and parameter optimization of the whole system; the method has the advantages of remarkable water-saving effect, energy conservation, consumption reduction, stable operation and good economical efficiency.

The utility model belongs to the technical field of pipeline materials, and particularly relates to a composite pipeline material. The utility model provides a composite pipeline material. The composite pipeline material comprises an inner surface layer, an inner fiber cloth reinforcing layer, an inner fiber winding layer, a fiber reinforcing structure layer, an outer fiber cloth reinforcing layer, an outer fiber winding layer and an outer protection layer which are sequentially stacked from inside to outside. The inner surface layer is made of epoxy resin; fibers in the inner fiber cloth reinforcing layer, the inner fiber winding layer, the fiber reinforcing structure layer, the outer fiber cloth reinforcing layer and the outer fiber winding layer are basalt fibers; and the outer protection layer is made of epoxy resin. According to the utility model, the epoxy resin and the basalt fiber have good electrical insulation performance and shielding performance, so that the pipeline material has a good stray current resisting effect.

According to the preparation method of the high-temperature-resistant durable super-hydrophobic powder coating, integrated powder coating particles are prepared by mixing through a tabletting-crushing-sieving technology, and finally, one end of a solid nano-material in the integrated powder coating particles is embedded into a bottom layer, and the other end of the solid nano-material protrudes out of the surface of the coating, so that a nano-fiber bridging interface strengthening structure is formed. According to the invention, the low surface energy material, the solid nano material and the thermoplastic film-forming resin are effectively combined together to construct firm and stable integrated powder coating particles, so that the overall performance is synergistically enhanced, and the protection capability of a micron-scale structure to a nano-scale structure is greatly improved; the solvent-free durable super-hydrophobic powder coating is directly prepared through electrostatic spraying, so that the technological process is simplified; the solid, solvent-free and environment-friendly super-hydrophobic powder coating is prepared, has excellent high-temperature resistance and super-hydrophobic performance, and has potential advantages in the aspect of anti-corrosion and anti-drag application of a heat distribution pipeline.

The invention relates to the technical field of heat pump units, and discloses a self-adaptive defrosting and oil return cooperative control method and device of a heat pump unit and a computer storage medium. The method comprises the steps that the current outdoor heat exchanger coil temperature parameter of the heat pump unit in the defrosting operation state is obtained, and according to the current outdoor heat exchanger coil temperature parameter, the heat pump unit in the defrosting operation state is defrosted; judging whether the heat pump unit meets a defrosting exit condition or not; if yes, target operation parameters of a compressor of the heat pump unit are obtained, and whether the heat pump unit meets the oil return time condition or not is judged according to the target operation parameters; if yes, the heat pump unit is controlled to execute the defrosting quit operation, and after the defrosting quit operation is completed, the heat pump unit is controlled to return oil, in this way, the self-adaptive defrosting and oil return cooperative control process of the heat pump unit is achieved, the unnecessary working condition switching frequency of the heat pump unit is reduced, and the unit can operate continuously; and the indoor temperature fluctuation is reduced, and the oil gas recovery efficiency is improved, so that the operation energy efficiency and reliability of the heat pump unit are improved.

The invention relates to the technical field of heat pump control, and discloses a defrosting method and device of a heat pump system and the heat pump system.The defrosting method comprises the steps that the temperature and humidity of gaps of a fin type heat exchanger are monitored in real time; and when the temperature is lower than or equal to the threshold value of the dynamic dew point temperature plus the safety margin and the humidity is higher than or equal to the threshold value, it is judged that the frosting prevention condition is met, the gap temperature is increased by adjusting the refrigerant bypass valve, the gap humidity is reduced by adjusting the airflow adjusting valve, and therefore frosting is actively prevented. And if the frost layer appears, short-time refrigeration interruption or low-power heating is started for defrosting according to the thickness of the frost layer or a pressure difference signal. And the formed ice layer is forcibly removed by switching the flow direction of the refrigerant and heating. By means of three-level linkage control, accurate defrosting in the whole process from prevention to removal is achieved, energy waste is effectively avoided, the defrosting efficiency and operation stability of the system are improved, and the user experience is improved.

The invention relates to the technical field of energy-saving air conditioners, in particular to a control method and device of a refrigerating system and the refrigerating system.The control method comprises the following steps that a time-of-use electricity price table of the next 24 hours is obtained, the upper limit and the lower limit of an indoor comfortable temperature interval set by a user are read, quantified building thermodynamic parameters are called, and a set of electricity price weights and indoor temperature constraints is established. According to the method, the time-of-use electricity price in the next 24 hours and the upper and lower limits of the indoor comfortable temperature interval set by the user are introduced in the refrigeration operation process of the compressor, the electricity price factor is combined with the thermodynamic dynamic response constraint, an economical optimization path of compressor power output is constructed, start-stop control logic purely oriented by demands is avoided, and the energy consumption is reduced. And on the basis of power regulation and control, the temperature difference between the coil temperature of the outdoor heat exchanger and the environment temperature is collected, the motor current of an outdoor fan is monitored at the same time, dynamic frost judgment logic is established, a static threshold judgment mode is replaced, and the compressor has the real-time sensing capacity in the operation process.

The invention relates to the technical field of air source heat pump control, and discloses an air source heat pump defrosting control method. According to the method, a frosting risk index and a trigger threshold are dynamically calculated through multi-sensor real-time data fusion processing; the defrosting effect is evaluated based on the defrosting process monitoring data, and defrosting duration parameters are adjusted in a self-adaptive mode; and finally, accurate triggering and termination of the defrosting control process are achieved by optimizing termination threshold judgment and system closed-loop feedback updating. The defrosting control accuracy and the system operation efficiency are effectively improved, the energy consumption is reduced, and the operation stability and reliability of the heat pump system are guaranteed.

The invention relates to the technical field of air source heat pumps, and discloses a wind-solar complementary air source heat pump integrated system which comprises a hardware device, an active frost suppression module and a predictive optimization scheduling control system. The control system can collect internal and external state data of the system and quantitatively calculate frosting risk indexes of the evaporator in all time periods in the future based on future environment temperature and humidity predicted values. According to the method, the hardware device is connected with the active frost suppression module, a dynamic decision is made according to the frosting risk index, when it is judged that the future frosting risk exceeds a preset threshold value, the active frost suppression module is started in advance, photovoltaic heat recovery warm water stored in the hardware device is used for preheating air entering an evaporator, and frosting is actively suppressed from the source. By means of predictive active frost suppression, a traditional passive and high-energy-consumption defrosting mode is replaced, the operation efficiency and heating stability of the heat pump system in the wet and cold environment are remarkably improved, and comprehensive and efficient utilization of energy is achieved.

A combined heat exchanger, a heat exchange system, and an optimization method thereof are provided. The heat exchange system includes: an enhanced vapor injection compressor, a condenser, an expansion valve and an evaporator, which are located in a main circuit; wherein the heat exchange system further includes a first branch branched from the main circuit to an vapor injection port of the compressor at a branch point P downstream of the condenser, and a first heat exchange unit and a second heat exchange unit are further provided in the main circuit between the branch point P and the expansion valve; and wherein a refrigerant leaving the condenser is divided at the branch point P into a first portion passing through the first heat exchange unit and the second heat exchange unit from the main circuit, and a second portion passing through the first branch to the vapor injection port.

The invention relates to the field of laser cladding powder, in particular to wear-resistant and corrosion-resistant laser cladding powder and a preparation method thereof. The laser cladding powder is used for solving the problem that a cladding layer formed by existing laser cladding powder is poor in abrasion resistance and corrosion resistance. According to the laser cladding powder, the carbon nano tube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder are added, and the carbon nano tube and the lanthanum-yttrium oxide have a synergistic effect to refine grains, so that the corrosion resistance of a cladding layer is improved, and the carbon nano tube has good wear resistance; after the surface of the titanium diboride powder is coated with the copolymer, the dispersity of the titanium diboride is improved, a product decomposed by the copolymer reacts with the titanium diboride under the action of laser to generate titanium carbide, and the wear resistance of a cladding layer is enhanced; the laser cladding powder is suitable for prolonging the service cycle of a mold, can be used for surface strengthening of mine equipment parts, enhances the wear resistance and corrosion resistance of the mine equipment parts, reduces the maintenance frequency of the equipment, and can provide an effective solution for surface strengthening of parts in various industrial fields.

The application discloses a nodular cast iron pipe with a composite coating and belongs to the technical field of metal corrosion prevention, comprising a nodular cast iron pipe base body, a composite outer coating coated on the outer surface of the nodular cast iron pipe base body and an inner coating closely attached to the inner surface of the nodular cast iron pipe base body, characterized in that the composite outer coating comprises an alkali-activated gel layer and a zinc-based coating, the zinc-based coating is arranged between the outer surface of the nodular cast iron pipe base body and the alkali-activated gel layer, the alkali-activated gel layer is an alkali-activated slag fly ash corrosion-resistant gel material, and the zinc-based coating is one or more of a pure zinc coating, a zinc-aluminum alloy coating or a zinc-rich coating layer. The alkali-activated gel layer provided by the application is coated on the inner or outer surface of the pipe and provides further corrosion protection for the nodular cast iron pipe, so that the pipe can be used in extremely harsh construction environments, and has extremely strong weather resistance in acidic soil and overhead fields.

The present invention relates to a safety device for a reversible heat pump device (10) with a refrigerant circuit coupled to a heat transfer circuit (20) via a first heat exchanger (13). The safety device comprises a first pressure switch for monitoring the pressure of a refrigerant in the refrigerant circuit of the heat pump device (10) and a temperature switch for monitoring the temperature of the refrigerant in the refrigerant circuit of the heat pump device (10). The first pressure switch comprises a first switch (S1) configured to open when the refrigerant pressure is less than a first predetermined pressure limit. The temperature switch comprises a second switch (S2) configured to open when the refrigerant temperature exceeds a predetermined temperature limit.The first switch (S1) is arranged in parallel to the second switch (S2), so that the power supply to the heat pump device (10) is interrupted if the first switch (S1) and the second switch (S2) are open.

The utility model discloses an air preheater for a burner at the bottom of an ethylene cracking furnace, and relates to the field of ethylene cracking, the air preheater comprises an air preheater body and a connecting air duct, the air preheater body comprises a preheater shell, an air inlet and an air outlet are formed in the two ends of the preheater shell respectively, and a heat exchange tube bundle is arranged in the preheater shell; a heat source inlet and a heat source outlet are formed in the preheater shell and connected to the two ends of the heat exchange tube bundle correspondingly. The air outlet is connected to a combustor at the bottom of the cracking furnace through a connecting air duct; one air preheater body is matched with a plurality of cracking furnace bottom combustors. The cracking furnace solves the problem that the bottom space of the cracking furnace is limited, is suitable for limited space, saves occupied area and is high in heat exchange efficiency.

The invention belongs to the technical field of energy storage systems, and particularly relates to a salt cavern compressed air energy storage system and a salt mist concentration control method thereof. A salt mist concentration sensor in the salt cavern compressed air energy storage system can monitor the salt mist concentration of compressed air passing through an air inlet and an air outlet of a salt cavern in real time, and when the salt mist concentration of the compressed air passing through the air inlet and the air outlet of the salt cavern is larger than an early warning value, a backwashing assembly sprays pure compressed air into a heat exchanger; the back flushing assembly is used for flushing the interior of the heat exchanger, specifically, the back flushing assembly sprays pure compressed air into the shell and flushes the inner surface of the shell and the outer surfaces of the heat exchange pipes, salt mist is prevented from being deposited on the inner surface of the shell and the outer surfaces of the heat exchange pipes, salt scales are prevented from being formed, the heat exchanger is prevented from being affected, and the service life of the heat exchanger is prolonged.

The invention provides a condenser type refrigeration cycle intelligent adaptation control method and system, and relates to the technical field of refrigeration. The method comprises the steps that environment state parameters are obtained, the environment frost point temperature is calculated, and an altitude correction factor representing the air side heat exchange capacity is calculated; executing boundary contraction transformation on a preset compressor operation envelope based on the altitude correction factor, and determining an allowable condensing pressure upper limit; an evaporator temperature response sequence is monitored, the time domain integral cumulant of the temperature response sequence relative to the environment frost point temperature is calculated, and the allowable evaporation temperature lower limit is dynamically increased based on the cumulant; constructing a target operation domain according to the allowable condensation pressure upper limit and the allowable evaporation temperature lower limit; and determining a current operation working point, and adjusting the control variable to enable the operation working point to fall into the target operation domain. The safety of the condensation side and the frost prevention stability of the evaporation side can be considered under the high-altitude and complex environment working conditions, and the continuous operation reliability of refrigeration circulation is improved.

The invention relates to a low-temperature efficient heating air energy heat pump unit, discloses a low-temperature efficient heating air energy heat pump unit, and belongs to the technical field of heat pump air conditioners. The unit is composed of a compressor, an evaporator, a condenser, a throttling valve, a defrosting module, a refrigerant adjusting module and a control unit. The surfaces of fins of the evaporator are coated with polytetrafluoroethylene modified hydrophobic frost-resistant coatings, and the frosting amount can be inhibited by 60% or above; the defrosting module adopts a bypass coupling scheme of a 500-800W electric heating wire and a high-temperature refrigerant, and the defrosting time is less than or equal to 8min and is shortened by 30% compared with a traditional scheme; the refrigerant adjusting module dynamically adjusts the refrigerant temperature of an inlet of the evaporator through the bypass electromagnetic valve and the refrigerant mixing cavity, so that the compressor still maintains 100% of the rotating speed at-25 DEG C without frequency reduction, the COP is larger than or equal to 2.0, and the heating capacity is kept 75% or above of the normal temperature value. The system solves the industrial problems of frequent frosting, high defrosting energy consumption and large heating attenuation under the low-temperature and high-humidity working conditions, and can be widely applied to heating systems in household, commercial and high-humidity and low-temperature areas.

An air conditioner includes an outdoor unit comprising a compressor and an outdoor heat exchanger, and an indoor unit connected to the outdoor unit and provided with an indoor heat exchanger. The indoor unit includes a first refrigerant flow tube connecting an inlet side of the indoor heat exchanger to the outdoor unit, a second refrigerant flow tube connecting an outlet side of the indoor heat exchanger to the outdoor unit, a first bypass tube branched from a first branch point of the first refrigerant flow tube and joined to a first joining point of the second refrigerant flow tube, a second bypass tube branched from a second branch point of the first refrigerant flow tube and joined to a second joining point of the second refrigerant flow tube, and a flow switching valve disposed between the first and second joining points of the second refrigerant flow tube.

The invention relates to a spraying anti-corrosion device for an underground pipeline of a building, and belongs to the technical field of pipeline spraying equipment. The spraying anti-corrosion device for the underground pipeline of the building comprises a frame body, a movable frame and a first air cylinder, the frame body and the movable frame are connected in an inserted mode, and the first air cylinder is fixedly installed on the frame body; free adjustment can be conducted according to the anti-corrosion spraying position of the underground pipeline, free switching of two states is conducted, in-pipe locking and positioning can be conducted on the underground pipeline when anti-corrosion spraying is conducted on the outer wall of the underground pipeline in the first state, it is ensured that the underground pipeline is in a stable rotating state when the outer wall of the underground pipeline is sprayed, and the underground pipeline is matched with a horizontally-moving movable spraying head; and in the first state, efficient and stable operation of anti-corrosion spraying of the outer wall of the underground pipeline is achieved, in the second state, one positioning mechanism is disconnected with the underground pipeline, the other positioning mechanism can be matched with the spraying mechanism to conduct anti-corrosion spraying on the inner wall of the underground pipeline, and the device can conduct anti-corrosion spraying operation on the two different positions of the inner wall and the outer wall of the underground pipeline.

The utility model relates to an automatic cleaning filter vat for a cooling tower, which comprises a vat body, a pollution discharge bottom plate, a filter cover cylinder, a water sealing top cover and a servo motor, the pollution discharge bottom plate is fixedly connected with the bottom end of the vat body, the filter cover cylinder is arranged in the vat body and positioned on the pollution discharge bottom plate, the water sealing top cover is fixedly connected with the top end of the vat body, and the servo motor is arranged on the water sealing top cover. The filtering cover cylinder comprises a filtering cylinder body, a rotating connecting frame, a rotating shaft and a water retaining disc edge, the water retaining disc edge is fixedly connected with the outer side of the top end of the filtering cylinder body, the rotating connecting frame is arranged in the filtering cylinder body and fixedly connected with the filtering cylinder body, the rotating shaft is arranged in the center of the rotating connecting frame and fixedly connected with the rotating connecting frame, and the rotating shaft is fixedly connected with the servo motor; the servo motor is electrically connected with a control system in the cooling tower, the barrel body is provided with a water inlet and a water outlet, the water inlet and the water outlet are communicated with a cooling water pipeline of the cooling tower, and the water inlet is higher than the edge of the water retaining disc. A self-cleaning system is adopted and integrated into the cooling tower, so that the cost and the space are saved.

An axial force measurement device includes a frame, a tightening actuation unit that performs tightening operation upon a screw type tube fitting installed upon a tube upon which is formed an annular portion projecting in the radially outward direction from the tube, a testing member, and a mating member holding unit that holds the testing member into which the tube fitting is screwed and that is coupled to the tube. The tightening actuation unit and the mating member holding unit are provided to the frame in line along the direction of a reference axis that extends in the direction of the center line of the tube fitting and the tube axis of the tube. The testing member has a first part that engages with the tube fitting, and a second part against which the annular portion of the tube is pressed.