1140 results about "Electronic expansion valve" patented technology

The invention relates to the technical field of intelligent fire extinguishing control of energy storage power stations, in particular to a method and system for plasma protection of thermal runaway of an air-cooled energy storage power station. The method comprises the following steps: processing real-time data acquired by a multi-source sensor through a dynamic risk assessment model to obtain a risk level and an early warning level; an initial control instruction for the plasma generator and the air cooling and refrigerating system is formed according to the risk level and the early warning level; the initial control instruction is processed to form a driving control signal; a control signal is subjected to cooperative execution processing to obtain a high-energy active particle jet flow, a forced airflow and a refrigeration effect. The system comprises an air cooling box body, a battery, a fan, a plasma generator, an ejector, an intelligent controller, a compressor, a gas-liquid separator, a heat exchanger, an electronic expansion valve, a drying filter, a gas sensor and a pressure sensor valve. The safety and reliability of the energy storage power station are improved.

The invention relates to the technical field of new energy automobile heat management, and belongs to an indirect heat pump heat management system for a new energy automobile. Battery outlet water and warm core outlet water are converged and then shunted through a waterway integration mode of a five-way valve and a proportional three-way valve, and the flow is distributed through the proportional three-way valve; the mixed water enters the battery to control the water inlet temperature of the battery, so that a water-water heat exchanger can be saved, and the effects of reducing cost and improving efficiency are achieved; on the aspect of the agent side, a large-diameter electronic expansion valve is arranged at an outlet of the water-cooling condenser, the internal flow and state of the water-cooling condenser are actively controlled by adjusting the opening degree of the large-diameter electronic expansion valve, the supercooling degree can be increased, the superheat degree can be restrained, the heat exchange capacity and the accurate control capacity can be enhanced, and heating and dehumidification outlet air temperature control in spring and autumn can be better achieved.

The invention relates to the technical field of new energy automobile heat management, and discloses a battery inlet water temperature-based dual-threshold decision-making method, which is realized through the following components: an intelligent collaborative decision-making center module, a multi-source data sensing acquisition module, a waste heat recovery and efficient heat exchange module, a precise execution driving module and a multi-level safety guarantee module. The intelligent collaborative decision center module comprises a heat management controller and an AI intelligent control unit; the multi-source data sensing and collecting module comprises a battery management system, a whole vehicle controller, an air conditioner controller and a full-dimension parameter monitoring sub-module. The waste heat recovery and efficient heat exchange module comprises a double-effect Chiller, an electronic expansion valve, a three-way valve and a four-way valve; the invention aims to solve the problems that energy consumption is increased and efficient circulation of energy cannot be realized due to the fact that waste heat generated in the operation process of components such as a motor cannot be fully excavated and reused and temperature control requirements are met by depending on additional heating or refrigerating components in the heat management of the existing new energy automobile.

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 utility model discloses an ice persimmon closed-loop heat pump dryer which comprises a drying chamber and a heat exchange system, and the drying chamber is provided with an air valve and a fan; the heat exchange system comprises a compressor, a condenser set, an electronic expansion valve and an evaporator which are sequentially connected and form a refrigerant circulation loop. The drying chamber has a high-temperature mode and a low-temperature mode, when the drying chamber is in the high-temperature mode, the air valve is closed, and when the drying chamber is in the low-temperature mode, the air valve is opened. Due to the indoor condenser and the outdoor condenser, the drying chamber can be flexibly switched between a high-temperature mode and a low-temperature mode, and the alternate operation mode not only can quickly and uniformly remove moisture in the persimmons, but also effectively reduces the tannin content in the persimmons. An air valve is arranged in the drying chamber and can change the flow direction of air in the drying chamber according to the working mode. Air flows through the heat regenerator twice and is heated / cooled, and the humidity is rapidly reduced in the process.

The application provides an electronic expansion valve, which comprises a rotor component, a screw rod and a stop rod. The rotor component comprises a rotor base, the screw rod is connected with the rotor base, and the stop rod is located below the rotor base in the axial direction of the electronic expansion valve and comprises a base and a rod part. The rod part is arranged in extension in the axial direction of the electronic expansion valve, the base is provided with a through hole, and the screw rod is arranged in the hole. The screw rod comprises a first abutting part, the rotor base comprises a second abutting part, and the base directly or indirectly abuts between the first abutting part and the second abutting part. The rotor component comprises a rotation-stopping part, the base is provided with a clamping part, the clamping part at least partially contacts the rotation-stopping part when the rotor component is actuated, and the clamping part follows the rotation of the rotation-stopping part.

The utility model relates to the technical field of valves, in particular to an electronic expansion valve. The electronic expansion valve comprises a valve body assembly, a nut sleeve, a sleeve and a valve element assembly. The valve body assembly is provided with a valve cavity and a first valve port. The nut sleeve is arranged in the valve cavity and fixedly connected with the valve body assembly, and a nut inner hole is formed in the end, close to the valve port, of the nut sleeve. One end of the sleeve is inserted into the nut inner hole, the outer wall of the sleeve is in sliding guide fit with the inner wall of the nut inner hole, and a circulation cavity and a second valve port are formed in the sleeve. The valve element assembly is movably installed in the nut sleeve, one end of the valve element assembly extends into the circulation cavity, a guide face is arranged on the outer wall of the valve element assembly, and the guide face is in sliding guide fit with the inner wall of the inner hole of the nut. According to the electronic expansion valve, the problem that the coaxiality of a nut sleeve, a valve needle component and a one-way valve in an existing electronic expansion valve is insufficient is solved.

The present application belongs to the technical field of heat pump air conditioner performance detection, and particularly relates to a heat pump air conditioner system economizer performance test system and test method. The test system comprises a first pressure transmitter arranged between a liquid accumulator and an economizer, a first mass flow meter arranged at the inlet of an electronic expansion valve, and a third pressure transmitter arranged between an evaporator and a gas-liquid separator of a heat pump air conditioner system to be tested. A first temperature transmitter is arranged along the main path pipeline connected to the economizer inlet direction, and a second temperature transmitter is arranged along the economizer outlet direction on the main path pipeline. A third temperature transmitter is arranged along the auxiliary path pipeline connected to the economizer inlet direction, and a fourth temperature transmitter, a second pressure transmitter and a second mass flow meter are sequentially arranged along the economizer outlet direction on the auxiliary path pipeline. The test system fills the gap of the current heat pump air conditioner system economizer performance test device and test method, and is conducive to promoting the development and application of heat pump air conditioner technology.

The refrigerating system comprises a compressor, an evaporative condenser, a gas-liquid separator, a heat regenerator, an evaporator, a heat recoverer, an energy storage device, a terrace heat exchanger, an oil separator, an oil cooler, a water pump, a temperature control valve, an electronic expansion valve, a three-way valve, a control device, a temperature sensor and a pressure sensor. The control device collects signals of compressor outlet and inlet pressure sensors and temperature sensors, evaporator outlet pressure sensors and temperature sensors, an oil return temperature sensor and a floor heat exchanger temperature sensor. Condensing pressure is adjusted by controlling starting and stopping of a condenser side fan and a water pump, and the opening degree of the three-way valve is controlled to enable the oil return temperature to be within a safe range. The evaporation temperature is maintained by adjusting the opening degree of an evaporator inlet electronic expansion valve. By monitoring the terrace temperature in the refrigeration house, the electromagnetic valve is controlled to adjust the refrigerant flow in the terrace heat exchanger to maintain the outlet temperature, and the energy storage device is intermittently put into the refrigeration house to improve the system energy efficiency.

This invention discloses a multi-temperature zone coordinated refrigeration system and energy-saving control method for variable-temperature cold storage, belonging to the field of cold storage temperature control technology. The system includes: calling a dynamic load prediction model based on the acquired initial real-time monitoring dataset to calculate the heat load change trend data for each temperature zone over a preset period; adjusting the electronic expansion valve and generating start-up control commands based on the heat load trend and the temperature and humidity requirements of the goods, starting, stopping, or switching the refrigeration unit to operate the system; activating the central oil circuit management module during system operation to monitor the compressor oil level and compare it with a preset safety threshold to generate oil circuit adjustment commands; starting the intelligent oil pump to deliver oil according to the commands, while using the evaporator outlet superheat or pressure value as a feedback signal to control the electronic expansion valve in a closed loop; and summarizing the data from the actuators and sensors and feeding it back to the central controller to form a closed loop. This invention achieves multi-temperature zone coordinated control, improving refrigeration efficiency and equipment safety, and reducing energy consumption.

The utility model relates to the technical field of fluid control, in particular to an electronic expansion valve. An electronic expansion valve comprises a valve seat, a guide sleeve and a piston assembly, and a valve port is formed in the valve seat; a balance channel is arranged in the electronic expansion valve, one end of the balance channel is located at the end, close to the valve port, of the piston assembly and communicated with the valve port, the other end of the balance channel penetrates through the end, away from the valve port, of the guide sleeve, and a filter screen is arranged at the end, close to the valve port, in the balance channel. The filter screen is arranged in a protruding mode in the direction away from the guide sleeve relative to the piston assembly. According to the filter screen, impurities can be prevented from entering the balance channel to affect normal work of the piston assembly, and when the electronic expansion valve is opened, media can flush media accumulated on the outer side face of the protruding part of the filter screen to prevent the filter screen from being blocked.

The application relates to an electronic expansion valve, which comprises a rotor assembly, a screw rod, a valve core assembly and a valve seat assembly, the valve core assembly can move along the axial direction of the screw rod relative to the valve seat assembly, one end of the screw rod is fixedly connected to the rotor assembly, the other end is connected with the valve core assembly, and the rotor assembly can drive the valve core assembly to move through the screw rod. The side wall of the valve seat assembly is provided with a first valve port and a second valve port, and the electronic expansion valve further has a first pre-tightening structure and / or a second pre-tightening structure. When the screw rod drives the valve core assembly to block the first valve port, the second pre-tightening structure can exert an action force on the valve core assembly to press the first valve port. When the screw rod drives the valve core assembly to block the second valve port, the first pre-tightening structure can exert an action force on the valve core assembly to press the second valve port. The electronic expansion valve provided by the application solves the problem that a gap is easily generated at the sealing position between the valve core and the valve port part, thereby causing the electronic expansion valve to leak.

The invention discloses a biomass gas heat pump system and a control method thereof. According to the method, a generator set part and a heat pump unit part are included; the electricity output end of the generator set part is connected with the electricity input end of the heat pump set part; the generator set part comprises a generator set, a radiator, a stop valve, a cylinder sleeve water heat exchanger and a flue gas waste heat recoverer; the heat pump unit part comprises a compressor, an oil separator, a four-way valve, a condenser, an electronic expansion valve, an evaporator and a gas-liquid separator; the system has two operation modes, namely refrigeration operation and heating operation, and can recover engine flue gas waste heat and cylinder sleeve water waste heat during heating, so that the heating capacity is large, and the heating energy efficiency is high. During refrigeration, flue gas waste heat and cylinder sleeve water waste heat need to be discharged into air, and only the heat pump unit supplies cold. According to the system, biomass gas serves as driving energy to drive the generator to operate, energy distribution of the generator set and the heat pump is adjusted in good time by reasonably utilizing engine cylinder sleeve water waste heat and smoke waste heat, and the primary energy utilization rate of the whole machine is increased.

The invention provides refrigeration equipment, a control method and a control device, and relates to the technical field of refrigeration control, and the control method is suitable for a refrigeration system with double refrigeration circuits and a cooling water heat exchange circuit. The refrigeration equipment comprises a first refrigeration loop, a second refrigeration loop and a first heat exchange loop. Based on the environment load signal, the start and stop states of the first compressor and the second compressor are dynamically controlled, and energy efficiency scheduling under different loads is achieved; the air suction and exhaust parameters and the liquid outlet temperature of each refrigerating circuit are collected, the superheat degree is calculated, the opening degree of an electronic expansion valve is adjusted, and stable liquid supply of an evaporator is ensured; meanwhile, the opening degree of an electric adjusting valve of each plate heat exchanger is controlled according to the exhaust temperature or pressure, and the condensate water flow is adjusted; and condensation control is further optimized in combination with liquid outlet temperature feedback. According to the method, efficient operation and condensation decoupling of the system under different load working conditions can be achieved, and the overall refrigeration performance and stability are improved.

The utility model discloses a heat management integrated module for a refrigerant side, a propane refrigerating system and a vehicle. The module comprises an integrated runner plate on which a compressor, a water-cooled condenser, a liquid storage drying tank, an electronic expansion valve and a battery cooling heat exchanger are integrated. Refrigerant circulates among all the components through a first flow channel, a second flow channel and a third flow channel which are independently arranged in the flow channel plate. By adopting the integrated design, the refrigerant leakage risk is remarkably reduced, the system size is effectively reduced, the space is saved, the heat management performance is improved, and key support is provided for safe application of the propane refrigeration technology.

The utility model provides an electronic expansion valve which comprises a valve body provided with a containing cavity and a valve port. The nut seat is arranged in the containing cavity and provided with a first inner threaded hole, and the first inner threaded hole is coaxial with the valve port; the valve needle component is arranged in the containing cavity and provided with a screw rod and a valve needle body which are oppositely arranged in the axis direction, the valve needle body is arranged close to the valve port and can adjust the flow at the valve port, and the screw rod is provided with a matched thread and is in threaded connection with the first inner threaded hole through the matched thread; the rotor component is rotatably arranged in the containing cavity and located on the side, away from the valve port, of the nut seat, a second inner threaded hole is formed in the rotor component, the rotor component is in threaded connection with the matched threads on the screw through the second inner threaded hole, and the rotor component is fixedly connected with the screw. According to the scheme, the problem that in the prior art, flow of valve needle components of single products of the same batch of electronic expansion valves is inconsistent when the valve needle components are in the fully-closed position can be solved.

The utility model relates to the technical field of fluid control, in particular to an electronic expansion valve. An electronic expansion valve comprises a valve seat, a guide sleeve and a piston assembly, a valve port is formed in the valve seat, one end of the guide sleeve extends into the valve seat and is connected with the valve seat in a sealed mode, and the guide sleeve is connected with the piston assembly in a sliding mode; the piston assembly comprises a positioning cylinder, a screw rod and a nut seat, one end of the positioning cylinder is arranged in the guide sleeve and is in sliding connection with the guide sleeve, the nut seat is arranged in the positioning cylinder and is connected with the positioning cylinder, one end of the screw rod is arranged in the nut seat in a penetrating mode and is in threaded connection with the nut seat, and the other end of the screw rod is in threaded connection with the nut seat. One end of the guide sleeve extends out of the positioning cylinder, the other end of the guide sleeve extends out of the positioning cylinder, a limiting part is arranged on the guide sleeve, a matching part is arranged on the positioning cylinder, and the limiting part is matched with the matching part to limit circumferential rotation of the positioning cylinder, so that the positioning cylinder can slide along the guide sleeve to adjust the opening degree of the valve port.

The invention discloses an indoor unit refrigerant leak detection control method of a multi-connected air conditioner and related equipment, and can be applied to the technical field of air conditioners. After the indoor units and the outdoor unit are connected through the connecting pipes, the first pressure sensor and the electronic expansion valve are arranged on the first indoor unit connecting pipe of each indoor unit, the second pressure sensor and the electromagnetic valve are arranged on the second indoor unit connecting pipe of each indoor unit, and the refrigerant concentration sensor is arranged in each indoor unit; when the multi-connected air conditioner is in the working process, the real-time refrigerant concentration, detected by the refrigerant concentration sensor, in each indoor unit is obtained, so that manual detection is not needed, the workload of workers is effectively reduced, then the on-off states of the electronic expansion valves and the electromagnetic valves on the corresponding indoor units are controlled according to the first real-time refrigerant concentration, and the on-off states of the electronic expansion valves and the electromagnetic valves on the corresponding indoor units are controlled according to the second real-time refrigerant concentration. And fault analysis is performed on the multi-connected air conditioner by combining the pipeline pressure value detected in real time on the indoor unit to obtain a fault analysis result, so that the working state of the multi-connected air conditioner is controlled, and the user experience is improved.

The invention provides a battery heating control system, method and device, electronic equipment and a storage medium. The system comprises a refrigerant loop, a cooling liquid loop and a controller, the cooling liquid loop comprises a first valve as well as a battery branch, a motor branch, a battery cooler branch, a condenser branch and a low-temperature radiator branch which are connected to the first valve; the refrigerant loop comprises a compressor and a third electronic expansion valve connected to the two ends of the compressor in parallel. A cooler in the battery cooler branch and a condenser in the condenser branch are connected in series and then are connected to the two ends of the compressor; the controller is used for controlling the conduction state of the first valve and the state of the third electronic expansion valve when it is detected that the battery needs to be heated. Various battery heating modes are achieved by controlling the first valve and the third electronic expansion valve, the battery heating device adapts to diversified use scenes, the heating efficiency can be improved, dependence on a heater is avoided, the cost is effectively reduced, and the endurance mileage of the vehicle under the low-temperature condition is increased.

The application discloses a kind of electric vehicle water-cooled plate performance test platform and data processing method, the test platform includes two circuits of cooling liquid circuit and refrigerant circuit, including heat pump air conditioning system, low-temperature radiator cooling system, data acquisition and control system and water-cooled plate test bench, heat pump air conditioning system includes compressor, condensing / evaporating radiator, four-way valve, electronic expansion valve and plate heat exchanger, and heating and refrigeration are realized by four-way valve Switching;Low-temperature radiator cooling system includes water-cooled radiator, three-way valve and liquid storage tank, water-cooled radiator, three-way valve and liquid storage tank are connected to form cooling liquid circuit and refrigerant circuit is exchanged with cooling liquid circuit by plate heat exchanger, and the performance experiment of low-temperature radiator to water-cooled plate test platform can be realized.This application can simulate the actual operating performance of water-cooled plate on real electric vehicle, can test the heat dissipation and heating capacity of water-cooled plate, and can determine the pressure drop or flow resistance under different flow and different temperature.

The embodiment of the invention discloses a linear cooling control method for an environmental test chamber, which comprises the following steps of: determining the rotating speed of a variable-frequency compressor of each equally divided cooling section according to a cooling theoretical parameter of each equally divided cooling section, a second cooling parameter of the environmental test chamber, a linear cooling rate and an operating parameter of the variable-frequency compressor; according to the cooling theoretical parameter of each equally divided cooling section, the third cooling parameter of the environmental test box, the linear cooling rate and the electronic expansion valve operation parameter, determining the electronic expansion valve step opening of each equally divided cooling section; according to the first operation data of the inverter compressor and the evaporator in each equally divided cooling section, the final temperature of the environmental test box, the operation parameters of the evaporator fan and the linear cooling rate, the rotation speed of the evaporator fan in each equally divided cooling section is determined; and according to the second operation data of the inverter compressor and the condenser in each equally divided cooling section, the operation parameters of the condenser fan and the linear cooling rate, the rotating speed of the condenser fan in each equally divided cooling section is determined.

The invention provides an energy-saving control method and system for a multi-split air conditioner. The energy-saving control method comprises the steps that a predicted heat load demand value is obtained according to a heat load prediction model of each indoor unit; obtaining a real-time energy efficiency coefficient and an energy consumption characteristic curve according to the operation state data of the outdoor unit; calculating a target operation frequency of an outdoor unit compressor and a target opening value of an electronic expansion valve of each indoor unit in combination with the predicted thermal load demand value, the real-time energy efficiency coefficient and the energy consumption characteristic curve; generating a real-time load correction coefficient in combination with indoor personnel data; correcting the predicted thermal load demand value according to the real-time load correction coefficient, and updating the target operation frequency and the target opening value by using the corrected thermal load demand value; and calculating a deviation value between the predicted thermal load demand value and the actual thermal load and an energy efficiency coefficient deviation value between the actual energy efficiency coefficient and the predicted energy efficiency coefficient, and correcting the weight parameter and the energy consumption characteristic curve of the neural network according to the deviation value. The overall energy consumption can be reduced, and the response precision and stability are improved.

The invention provides a heat pump ring fin difference control method and system based on dew-point temperature prediction, and the method comprises the steps: calculating the current dew-point temperature based on the air temperature and the relative humidity, and obtaining a future dew-point temperature sequence through linear weighting prediction based on historical dew-point data; generating a candidate control action set based on the current dew point temperature, the future dew point temperature sequence, the current fin temperature, the current opening degree of the electronic expansion valve, the rotating speed of the fan and the upper limit of the adjustment stride; screening candidate action subsets through an evaluation function; for each candidate action, using a semi-analytical system response simulator to predict a future fin temperature sequence, and calculating a difference sequence between the fin temperature and the dew point temperature based on the future fin temperature sequence; carrying out weighted calculation on a risk score for the difference value sequence of each action, and screening an action set based on a risk score threshold value; and an objective function is constructed, the action with the minimum objective function value is selected as the optimal control action, and the optimal control action is issued to the electronic expansion valve and the fan driver through PWM signals.

The invention discloses an integrated secondary circuit thermal management system for an electric automobile. Comprising a water-cooling evaporator, a gas-liquid separator, a compressor, a water-cooling condenser and an electronic expansion valve which are sequentially connected to form a refrigerant loop, and a passenger compartment water loop, a battery water loop and a motor water loop which are respectively connected with the water-cooling evaporator and the water-cooling condenser through a first four-way valve and a second four-way valve. A one-dimensional architecture diagram is adopted, the architecture arrangement of the motor, the motor water loop and the battery water loop is reasonably designed, multiple waste heat recovery modes are experimented, the waste heat of the motor is fully utilized, the energy efficiency of the system is improved in a low-temperature environment, unnecessary parts are reduced, and the complexity and cost of the system are reduced.

The invention relates to the technical field of new energy vehicles, and provides a thermal management method and system of an electric vehicle and the electric vehicle. The electric automobile comprises a refrigerant module, a battery temperature control loop communicated with the refrigerant module through a first electronic expansion valve and a passenger compartment air conditioner loop communicated with the refrigerant module through a second electronic expansion valve. The thermal management method of the electric automobile comprises the steps that multi-dimensional parameters describing a battery and the environment are obtained; obtaining a first initial opening degree and a second initial opening degree based on a fuzzy logic algorithm and a rule base according to the multi-dimensional parameters; acquiring a first weight corresponding to the first initial opening degree and a second weight corresponding to the second initial opening degree according to the driving mode; and closed-loop adjustment is conducted on the weighted opening degree through a PID algorithm, the first control opening degree of the first electronic expansion valve and the second control opening degree of the second electronic expansion valve are obtained, and the first electronic expansion valve and the second electronic expansion valve are controlled according to the first control opening degree and the second control opening degree.

The utility model provides an electronic expansion valve which is characterized in that a valve body is provided with a first installation cavity and a second installation cavity, a valve assembly is arranged at the position of the first installation cavity and comprises a sleeve, a coil assembly and a circuit board, the sleeve is fixed to the valve body, the coil assembly is arranged on the outer side of the sleeve in a sleeved mode, and the circuit board is arranged in the direction perpendicular to the extending direction of the sleeve. The coil assembly is electrically connected with the circuit board; the detection end of the sensor is arranged in the second mounting cavity, the axis direction of the sensor is perpendicular to the extension direction of the sleeve, and the connecting end of the sensor is located outside the valve body; one end of the connecting assembly is electrically connected with the connecting end of the sensor, and the other end is electrically connected with the circuit board. According to the technical scheme provided by the utility model, the problem that a direct electric connection mode between the sensor and the circuit board is not applicable when the distance between the sensor and the circuit board is far in the prior art is solved.

The utility model relates to the technical field of fluid control, in particular to a valve seat and an electronic expansion valve. A first opening, a second opening and a first mounting opening are formed in the valve seat, the first mounting opening is inclined relative to the first opening and the second opening, and the included angle between the first mounting opening and the first opening is smaller than that between the first mounting opening and the second opening. A first protrusion protruding towards the first installation opening is arranged on the inner wall of the valve seat, a valve hole is formed between the first protrusion and the second opening, one end of the valve hole is communicated with the second opening, and a valve port is formed in the other end of the valve hole. A conical section is arranged on the inner wall of the valve seat and located at the end, connected with the valve hole, of the second opening, the inner diameter of the conical section is gradually reduced in the direction away from the second opening, and the valve hole is connected with the conical section. The butterfly valve has the advantages that the heights of the valve seat and the valve port can be reduced, the flow loss of a medium can be reduced, the flow is increased, and the overall height of the valve can be reduced.

The utility model discloses a carbon dioxide internal defrosting system which comprises a carbon dioxide circulation loop and an internal defrosting liquid return pipeline, the carbon dioxide circulation loop and the internal defrosting liquid return pipeline are formed by connecting pipelines, the carbon dioxide circulation loop conducts compression refrigeration circulation, and the internal defrosting liquid return pipeline conducts low-temperature defrosting circulation. The internal defrosting liquid return pipeline further comprises a second electromagnetic valve, a third electromagnetic valve and a check valve on the basis of the carbon dioxide circulation loop, the second electromagnetic valve is arranged on the connecting pipeline and connected with the electronic expansion valve in parallel, and a liquid return pipeline connected with the carbon dioxide liquid storage device through the third electromagnetic valve and the check valve is arranged at an outlet of the low-temperature air cooler. The device does not consume electric energy, and is energy-saving and environment-friendly; no risk exists in long-time defrosting, and safety and reliability are achieved; and the defrosting time is short, the defrosting heating area is large, and the defrosting efficiency is high.

The utility model relates to the technical field of fluid control, in particular to a valve structure and an electronic expansion valve. A valve structure comprises a valve seat and a plugging barrel, a valve port is formed in the valve seat, and the plugging barrel can move to change the distance between the plugging barrel and the valve port; a containing groove is formed in the side face of one end of the plugging barrel, a sealing gasket is arranged in the containing groove, a sealing groove is formed in the end face, away from the valve port, of the sealing gasket, a sealing ring is arranged in the sealing groove and abuts against the groove wall of the containing groove, and a protrusion is arranged on the inner wall of the valve port. The sealing gasket abuts against the protrusion, the distance between the abutting point of the sealing ring and the containing groove and the contact point of the sealing gasket and the protrusion in the direction perpendicular to the axis of the valve port is D, and D is smaller than or equal to 1.5 mm. The sealing ring has the advantages that the sealing gasket can be prevented from being bent and inclined, so that the sealing performance of the sealing ring is ensured.

The invention discloses an electronic expansion valve and an air conditioning system, and relates to the technical field of electronic expansion valves.The electronic expansion valve comprises a first valve needle and a valve port assembly, the valve port assembly comprises a connecting base, a valve port ring and a pressing sleeve, the connecting base comprises a limiting part, a connecting part located below the limiting part and a hollow inner cavity, and the valve port ring is arranged in the inner cavity; the valve port ring is arranged in the inner cavity and abuts against the limiting part, the pressing sleeve is connected with the connecting part, the valve port ring and the limiting part axially press the valve port ring, the valve port ring is provided with a valve port communicated with the inner cavity, the first valve needle is movably arranged on the connecting base, and the second valve needle is movably arranged on the connecting base. And a flow path through which the connecting seat is communicated with the valve port is opened and closed. The technical scheme provided by the invention aims to solve the problems of separation and internal leakage of the sealing ring caused by insufficient limiting of the sealing ring by a valve port piece under the condition of a large-diameter valve port of the electronic expansion valve.