153 results about "Compression ratio" patented technology

A heat pump system for a vehicle may include an ejector configured to increase the pressure of the introduced refrigerant and discharge the refrigerant with the increased pressure to increase the pressure and flow amount of the refrigerant, thereby being capable of decreasing the refrigerant load of the compressor by reducing the compression ratio of the compressor, and reducing the cooling load and improving the cooling performance.

The invention belongs to the technical field of compressors, and particularly relates to an MVR (mechanical vapor recompression) vapor compressor, a detection control system with multi-stage recognition capability is introduced on the basis of compressor basic equipment, and the system collects vapor parameters, mechanical states and process state data in real time through a multi-dimensional state sensing module; the operation stage identification module intelligently divides the system operation process into an initial starting stage, a transition stage and a stable operation stage according to the data; and the self-adaptive control module calls a corresponding preset strategy set according to the identified different stages and dynamically adjusts the rotating speed and the compression ratio of the compressor, for example, low-speed soft start is executed in the initial stage of start, smooth tracking adjustment is performed in the transition period, and accurate and stable control is implemented in the stable operation period. Self-adaptive and refined regulation and control of the whole process from starting to stabilization of the system are achieved, mechanical and electrical impact is effectively reduced, variable working condition adaptability and operation stability are improved, and the overall energy efficiency is optimized.

The embodiment of the invention provides an engine supercharging system and a vehicle, and relates to the technical field of vehicle manufacturing. The electronic supercharger is constructed into a two-stage supercharger, the electronic supercharger is provided with a first-stage compressed air flow channel and a second-stage compressed air flow channel, a turbine compressed air flow channel is formed in the turbocharger, and the first-stage compressed air flow channel, the second-stage compressed air flow channel and the turbine compressed air flow channel are distributed in series. And the three-stage compressed air inlets are communicated with the air inlet to form three-stage compressed air inlet to the air inlet. According to the engine supercharging system provided by the embodiment of the invention, gas can be supercharged for three times through the first-stage compressed air flow channel, the second-stage compressed air flow channel and the turbine compressed air flow channel, so that the air compression ratio can be increased, the turbine hysteresis phenomenon is avoided, the air inlet pressure response speed is increased, and transient air supply to an engine is ensured; the operation stability and combustion efficiency of the engine are guaranteed, the fuel economy of the engine is improved, and the driving experience is improved.

A method for the autonomous control of a surface unit of an oil well or gas well down-hole rod pump to provide for a reduction of gas interference and an increase in production, the method providing for autonomous adjustment of one or more pump operation characteristics, including one or more of dwell time, polished rod travel, compression ratio, and pump cycle rate, and the method including autonomous determination of a weight transfer position, autonomous determination of a rate of weight transfer, determination of a stretch factor of the polished rod, and autonomous adjustment of one or more of the pump operation characteristics for successive pump cycles of the down-hole pump installation based upon the weight transfer position, the rate of weight transfer, and the stretch factor.

A gas spring-powered fastener driver includes an outer cylinder, an inner cylinder positioned within the outer cylinder, and a moveable piston positioned within the inner cylinder. The gas spring-powered fastener driver further includes a driver blade attached to the piston and movable therewith between a top-dead-center (TDC) position and a driven or bottom-dead-center (BDC) position. The outer cylinder and the inner cylinder define a first total volume in which gas is located when the driver blade is in the TDC position. The outer cylinder and the inner cylinder define a second total volume, in which gas is located when the driver blade is in the BDC position. A compression ratio of the second total volume to the first total volume is 1.7:1 or less. And, a force acting on the driver blade when located in the TDC position is at least 90 pound-force (lbf) but no more than 450 pound-force (lbf).

A piston (22) for an internal combustion engine (12) includes a piston skirt (64) and a piston crown (70) attached to the piston skirt and including a combustion face (72). The combustion face forms a piston rim (74) and a combustion bowl (78). A bowl rim (82) defines an intersection of the combustion bowl and the piston rim, and a reentry surface (84) defining a reentry angle extends between the bowl rim and the bowl outer wall. A ratio of a bowl depth dimension coincident with the piston central axis to a compressed height dimension coincident with the piston central axis is from about 0.30 to about 0.35.

Method for controlling the internal combustion engine (4) of a motor vehicle during the operation of the motor vehicle, wherein the internal combustion engine (4) has at least two operating modes in which different torque ranges are provided, and the control has a switching function for switching the internal combustion engine between the at least two operating modes, comprising the steps: Performing route forecasting during operation to determine route data for upcoming track sections, Predicting the torque requirement for upcoming track sections based on track data, The switching function for changing the internal combustion engine from a first operating mode to at least the second operating mode for an upcoming section of track may only be activated if the track forecast for the upcoming section shows that the operating point of the internal combustion engine lies within a torque range for at least a predetermined period of time, which covers the torque requirement predicted for this section of track by at least the second operating mode. characterized by the fact that the operating modes are realized through different compression ratios of the internal combustion engine.

The invention belongs to the technical field of Internet of Vehicles communication, and discloses a heavy diesel vehicle remote monitoring method and system based on edge computing, and the method comprises the steps: constructing a rule engine according to a predefined transmission rule, and deploying the rule engine to an edge computing node; the data stream of the heavy diesel vehicle is transmitted to an edge computing node, a rule engine is used for evaluating each data field in the data stream, a corresponding transmission level is distributed, and the transmission level comprises a first-level field, a second-level field and a third-level field; and matching a preset transmission strategy according to the data field with the allocated transmission level, executing differentiated data processing, and transmitting a processing result to an enterprise cloud platform through a network transmission layer. According to the method, low-value data is filtered in real time through edge calculation, the invalid data uploading amount is reduced, and data transmission is reduced; in addition, through a high compression ratio and a delay transmission technology, the bandwidth occupation of low-value data is reduced, and the utilization efficiency of network resources is optimized.

The application discloses an air conditioner control method and device, an air conditioner and a storage medium, and belongs to the technical field of air conditioners. The application obtains the discharge pressure and the return air pressure of the compressor; controls the operation of the flow regulating device according to the discharge pressure and the return air pressure, detects the discharge pressure and the return air pressure of the compressor in real time, then adjusts the flow regulating device according to the detected discharge pressure and return air pressure, adjusts the flow regulating device, and effectively avoids the situation that the compression ratio of the compressor is increased, further protects the compressor, and prolongs the service life of the compressor.

The invention discloses a cold start control method and device of an engine, electronic equipment and a storage medium. The method comprises the steps that in response to starting of an engine of the vehicle, environment parameters of the environment where the vehicle is located and first starting condition parameters of the engine are obtained, and the first starting condition parameters are used for representing condition parameters of the engine after the engine is started; based on the environment parameters and the first starting condition parameters, whether the vehicle is in an engine cold starting scene or not is determined; under the condition that the vehicle is in the engine cold start scene, an engine of the vehicle is controlled to be in a first Miller cycle state, the first Miller cycle state is used for representing that the engine is in the Miller cycle state, and the target parameter ratio of the engine is smaller than a preset ratio; the target parameter ratio is used for representing the ratio of the expansion ratio of the gas in the cylinder of the engine to the actual compression ratio. According to the method and the device, the technical problems that the operation efficiency of the engine is low and the emission exceeds the standard under the cold start condition in the prior art are solved.

The invention belongs to the technical field of engines, and discloses a fuel and air separated compression type internal combustion engine which comprises a cylinder A and a cylinder B. The internal combustion engine further comprises a driving mechanism arranged on the outer wall of the cylinder A; the connecting block is mounted on the outer walls of the cylinder A and the cylinder B through a mounting mechanism; wherein the driving mechanism comprises a chain wheel A, the outer wall of the chain wheel A is in transmission connection with a chain wheel B through a chain, the outer wall of the chain wheel B is fixedly connected with a bevel gear A, the outer wall of the bevel gear A is meshed with a bevel gear B, and the outer wall of the bevel gear B is fixedly connected with a half gear; through separated compression design of the cylinder A and the cylinder B on air and fuel, the compression ratio is greatly increased to strengthen the acting efficiency, the power performance of the internal combustion engine is improved, the problem that a traditional internal combustion engine is low in efficiency is solved, the combustion efficiency of a medium in the cylinder B can be improved through engine waste heat, and then the utilization rate of the waste heat is increased.

The utility model belongs to the technical field of special devices of compression type garbage trucks, and particularly discloses a variable cross-section scraper which comprises an inner buckling arc-shaped panel and a back plate of an upper arch arc-shaped structure, the arc-shaped angle of the back plate and the panel enables component force in the compression direction to be larger, the compression ratio is improved, and when a feeding device dumps garbage, the compression ratio is improved. The back plate structure ensures that garbage is easily guided into a pre-compression area at the rear end of the lower portion of the filler, the garbage is not deposited on the scraper, the garbage is firstly extruded and crushed in a pre-compression cavity and then enters a compression cavity in the process that the scraper rotates forwards, the scraper rotates to the foremost end in the compression cavity, the garbage is extruded again, and the garbage is compressed again. And in the upward moving process of the sliding plate and under the reverse acting force of the push plate, the garbage is extruded and formed through bidirectional stress, after the structure is optimized, the scraping plate can increase the compression force borne by the garbage, plastic deformation of the garbage as much as possible in the loading operation process is achieved, the compression ratio is increased, and the net load rate of the whole vehicle is increased.

This invention discloses an intelligent calculation method for the thermal compression ratio of a diesel engine based on machine learning, comprising the following steps: S1, acquiring diesel engine thermal operation data and generating a state data sequence; S2, performing continuous-time state encoding on the state data sequence to construct a state representation sequence; S3, performing feature contribution analysis on the state representation sequence to generate a correlated feature sequence; S4, performing state correlation propagation and compression ratio optimization calculation on the correlated feature sequence to obtain a predicted compression ratio sequence; S5, constructing a theoretical pressure curve and an in-cylinder pressure curve based on the predicted compression ratio sequence, and calculating the curve deviation sequence; S6, performing feedback updates based on the curve deviation sequence and outputting the calculation results. This invention, combined with dual-state flow liquid neural networks, possesses advantages such as strong adaptability to thermal engine states, high accuracy in compression ratio calculation, high stability in complex operating condition analysis, and strong continuous dynamic optimization capability.

The refrigeration device using an R454C refrigerant has, as compared with the refrigeration device using an R32 refrigerant, a higher ratio of a discharge pressure to a suction pressure of a compressor, and a larger impact load applied to a bearing portion of a crankshaft, so that the bearing portion is easily damaged. An air conditioning device (1) comprises a refrigerant circuit (10) and an outdoor unit control unit (71). The refrigerant circuit (10) has a compressor (11). The refrigerant circuit (10) circulates a refrigerant by the compressor (11) to perform a refrigeration cycle. The outdoor unit control unit (71) performs control relating to the refrigeration cycle. The compressor (11) has a compression chamber (Sc) in which the refrigerant is compressed, and an injection pipe (53) that communicates with the compression chamber (Sc). A ratio of a discharge pressure to a suction pressure of the compressor (11) is 4.5 times or more and 6.25 times or less a compression ratio of the compression chamber (Sc). The outdoor unit control unit (71) performs control such that a first ratio, which is a ratio of the flow rate of the refrigerant flowing through the injection pipe (53) to the flow rate of the refrigerant circulating through the refrigerant circuit (10), is 79% or more.

The invention provides a vehicle test data processing method and a vehicle, and relates to the technical field of vehicle test. According to the method, the compression mode and the transmission bandwidth of each kind of driving data can be determined according to the importance of each kind of driving data; for each kind of driving data, the driving data is compressed according to the compression mode corresponding to the driving data, and because the transmission bandwidth of each kind of driving data is positively correlated with the corresponding importance, the compression loss corresponding to the data compression mode of each kind of driving data is negatively correlated with the importance of the driving data. And the compression ratio corresponding to the data compression mode of each type of driving data is negatively correlated with the importance of the driving data, so that the more important driving data is allocated with a larger bandwidth, the smaller the compression ratio is, and the lower the compression loss is; the transmission timeliness of important driving data and the quality of the important driving data received by the service platform can be improved.

The bore is reduced while the stroke is not lengthened to maintain the required displacement. [Solution] If we consider a square combustion chamber with a displacement of approximately 500cc, a bore and stroke of 54mm x 54mm x 4 pistons results in a very small bore and stroke of 494.6cc, compared to a normal single-piston engine with a bore and stroke of 85.72mm x 85.72mm and a displacement of 494.6cc. With an area ratio of 2.52 to 1 compared to a normal single-piston engine, the 4 pistons will experience more than 2.5 times the combustion pressure if the compression ratio is the same. If a normal single-piston 3-cylinder 1484cc engine produces 100 horsepower, then a 4-piston engine would theoretically produce 250 horsepower. And all this with the fuel efficiency of a naturally aspirated 1.5L engine. Although there are considerable mechanical losses due to the movement of four pistons and two crankshafts, the resulting increase in power more than compensates for these losses.

The invention discloses a method for evaluating the sealing performance of a fuel cell rubber sealing ring at a low temperature, and relates to the technical field of fuel cell sealing. Measuring a compression force-strain curve at 23 + / -2 DEG C; gradually reducing the temperature to a target temperature point and reading the compression force; establishing a hyper-elastic model based on the stress-strain curve; inputting material properties to perform low-temperature sealing force simulation and calibrating a thermal expansion coefficient; calculating the leakage rate through a temperature-compression ratio-leakage rate quantitative correlation model; and determining a minimum compression ratio design boundary according to the leakage rate threshold value. According to the application, sealing performance evaluation is upgraded from experience qualitative judgment to data-driven quantitative design, the sealing reliability and research and development efficiency of the fuel cell stack in extreme low-temperature environments such as-40 DEG C are remarkably improved, and a scientific basis is provided for commercial application of fuel cells in alpine regions.

The application provides a neutron equivalent modeling method and device for high filling rate dispersion particles, and the method comprises the following steps: calculating the maximum outer radius of the equivalent particles; under the premise of keeping the core diameter of the particles unchanged, calculating the maximum compression ratio of the cladding layer of the particles; according to the set compression ratio, calculating the filling rate of the equivalent fuel element after the size of the cladding layer of the particles is compressed, wherein the set compression ratio is less than or equal to the maximum compression ratio; adjusting the density of the cladding layer material and the density of the matrix material to ensure the conservation of nucleon number of the cladding layer and the matrix material before and after the equivalent; and using a traditional modeling method to perform geometric modeling and neutron calculation on the equivalent fuel element. The application can effectively avoid the filling rate limitation of the random sequence increasing method, meet the modeling demand of random distribution of high filling rate dispersion particles, and realize reactivity equivalence and ensure the neutron calculation accuracy.

The invention relates to a compression ratio measuring system, method and device of a to-be-measured engine. The system comprises a liquid storage container, an image acquisition device and a computer device, the liquid storage container is communicated with the combustion chamber, so that the internal space of the liquid storage container and the combustion chamber form a containing space, the image acquisition device is connected with the computer device, and the containing space is used for containing liquid so that the liquid can be stored in the liquid when the crankshaft drives the piston to move in the air cylinder. The volume of the liquid in the liquid storage container is changed along with movement of the piston, the image acquisition device is used for acquiring images of the liquid in the liquid storage container, and the computer device is used for acquiring the images acquired by the image acquisition device, acquiring the maximum volume and the minimum volume of the liquid in the liquid storage container according to the images and displaying the maximum volume and the minimum volume. And determining the compression ratio of the to-be-tested engine according to the maximum volume and the minimum volume. By adopting the system, the upper dead center and the lower dead center of the piston do not need to be manually confirmed, and the measurement accuracy of the engine compression ratio is improved.

The utility model relates to the technical field of mechanical transmission, and provides a connecting rod transmission mechanism and a mirror image engine. The connecting rod transmission mechanism comprises a power sliding block, a power connecting rod and two power pistons, the power connecting rod comprises a connecting rod base body and two linear rod parts, the linear rod parts extend in the first direction, the front end of each linear rod part is connected with one power piston, and the rear end of each linear rod part is fixedly connected with the connecting rod base body; the two linear rod parts are located on the two opposite sides of the connecting rod base body in the first direction, and the power sliding block is installed on the connecting rod base body in a sliding mode in the second direction. The linear rod part does not need to contain a bearing, rotation motion does not exist, the overall cross section is uniform or roughly uniform, standard sinusoidal motion / cosine motion is met, the size reduction design of the linear rod part and the air cylinder is facilitated, the compression ratio in the air cylinder is increased, the combustion efficiency is improved, the overall structure of the engine is more compact, and the needed engine cabin space is reduced. And the power-to-weight ratio and the acceleration performance of the vehicle can be improved.

This invention provides a method for determining the oil level of a compressor and an air conditioning system. The compressor has an oil sump, and a throttling element and a liquid temperature sensor are sequentially installed at the outlet of the oil sump. The liquid temperature sensor is used to measure the temperature Tk of the fluid flowing out of the oil sump after being throttled by the throttling element. The method includes: acquiring the compressor's high-pressure Ph, low-pressure Ps, discharge temperature Tp, and fluid temperature Tk; determining the compression ratio Px based on the high-pressure Ph and low-pressure Ps; calculating the predicted oil temperature Tkcal of the compressor based on the compression ratio Px, discharge temperature Tp, and low-pressure Ps; calculating the difference ΔT between the predicted oil temperature Tkcal and the fluid temperature Tk, and comparing the difference ΔT with preset dynamic parameters; and determining whether the compressor's oil level is qualified based on the comparison result of the difference ΔT and the dynamic parameters. The control method of this application is simple, convenient, reduces manual intervention, and has high accuracy.

The utility model relates to the technical field of automobile batteries, in particular to a battery module stacking, extruding and assembling device which comprises a metal welding frame, the long-stroke main oil cylinder, the extrusion movement module, the module end plate extrusion module, the short-stroke auxiliary oil cylinder, the top limiting mechanism and the bottom supporting mechanism are mounted on the machine frame; the extrusion movement module slides on the sliding rail; the module end plate extrusion module is provided with a plurality of independent extrusion units. And the extrusion movement module can synchronously drive the extrusion unit and the drawable part of the supporting mechanism to move. The device is high in structural rigidity, stable extrusion under high pressure and large compression ratio can be achieved, and the assembly precision, stability and efficiency are improved through cooperation of multi-unit independent pressure applying and liftable supporting and by being matched with the bandage step-by-step sleeving process.

The invention mainly relates to the technical field of compressors, and provides a control method for dynamic protection of a compressor in order to dynamically protect the compressor in a grading manner according to the operation condition of the compressor, which has the core that: a key parameter, which directly reflects the load of the compressor, of the compression ratio is used as a core monitoring index; the compression ratio is calculated in real time, and three-stage progressive protection is implemented: when the compression ratio exceeds a safe operation range, firstly, active frequency reduction is performed, the rotating speed of a compressor is controlled, if frequency reduction is invalid, a throttle valve is opened, the compression ratio is tried to be reduced from a system level, and if the compression ratio continuously exceeds the limit, shutdown and alarm are performed finally, the compressor is prevented from being unstable, and passive is changed into active, so that the compression ratio is protected. The intervention strategy from light to heavy guarantees the safety of the compressor, maintains the operation of the system to the maximum extent, and remarkably improves the operation reliability of the compressor system.

The utility model discloses a stretching gas spring for a charging pile cantilever, which comprises a cylinder body, an inner pipe is arranged in the cylinder body, a piston rod is arranged in the inner pipe, a V-shaped sealing piece, a piston pad, a tension spring piston and a rear side plugging piece are sequentially sleeved at the front end of the piston rod, and a pipe sleeve, a rear end sealing piece and a guide piece are sequentially sleeved at the rear end of the piston rod. The outer end of the plugging piece and the outer end of the guiding piece are each provided with a tail plug, the bottom of the plugging piece and the bottom of the pipe sleeve are arranged in the inner pipe, and the cylinder body and the inner pipe are both filled with nitrogen. The inner chamber and the outer chamber in the stretching gas spring are used for storing gas, the gas compression ratio is small, the linear change of a stress value is smaller, a double-sealing structure is adopted, the gas tightness is good, gas leakage on the inner side is avoided, a vent hole is hidden after the side face of the tail plug is punched, and the product is more attractive.

The rod-free mechanisms are used for converting rotational motion into reciprocating motion and vice versa. The mechanism can be used in displacement pumps and compressors, as well as in internal and external combustion engines, cubic expansion engines, steam engines, hydro and pneumatic engines. Coulisse-eccentric motor automatically feeds and distributes the actuation fluid to the swept-volume capacities. Coulisse-eccentric motor is easy to manufacture, contains a minimum of parts, such as a housing, a coulisse and an eccentric, can be made entirely of ceramics, and allows converting the pressure difference between the two internal volumes of the coulisse into rotational motion on the shaft, and vice versa. Coulisse-eccentric motor in motion allows reversing, changing the shaft torque and compression ratio, while all engine components operate normally and are not subjected to excessive loads.

The invention relates to a high-speed stretching controllable spring for adjusting a bicycle seat, which comprises a starting ejector rod, a hollow piston rod, a framework guide, a sealing ring, a pressurizing air cavity, a positioning groove, a piston assembly, an oil cavity and a cylinder barrel, the interior of the cylinder barrel is divided into the pressurizing air cavity and the oil cavity by taking the positioning groove as a boundary, and the framework guide is arranged at one end of the cylinder barrel; a sealing ring is arranged on one side of the framework guide, the piston assembly and the framework guide are arranged at one end of the oil cavity, one end of the hollow piston rod is connected with the piston assembly, the other end of the hollow piston rod penetrates through the framework guide and extends out of the cylinder barrel, the starting ejector rod is arranged in the hollow piston rod in a penetrating mode, and a piston valve needle is arranged in the piston assembly. The piston valve needle is connected with the starting ejector rod; the problem that the stretching elastic speed of seat adjustment is low is solved, and the adjustment response efficiency is improved; the product size is reduced, the installation adaptability is optimized, and the compression ratio is reduced so as to reduce the change of operating force.

This invention relates to a dry twin-screw vacuum pump. A cooling jacket on the outer periphery of the pump casing, a first cooling chamber inside the front cover, and a second cooling chamber inside the rear cover are connected to form a water-cooling channel. An air-cooling device is connected to the pump casing, and the air-cooling pipe of the device passes through the cooling jacket and enters the inner cavity of the pump casing. The first and second screw rotors are conjugately meshed, and the end face profiles of both the first and second screw rotors are formed by connecting six curve segments end-to-end. The advantages of this invention are: through the dual action of water cooling and air cooling, the pump casing, front cover, rear cover, and internal rotor are cooled and cooled, resulting in better cooling and preventing the rotor from being damaged due to thermal expansion, which could affect the pumping performance; by improving the screw rotor profile, lead, and rotor length variation, and through the dual cooling design, the compression ratio can be increased, the pumping speed of the vacuum pump can be improved, and a lower ultimate vacuum can be achieved, thus improving the performance of the screw vacuum pump.

Methods and systems are provided for actively heating pistons in combustion chambers to reduce torque imbalance in an engine. In one example, a method for operating an engine includes determining a variance between compression ratios in a first combustion chamber and a second combustion chamber, and operating a piston heating system to apply a target amount of heat to a first piston assembly based on the variance between the compression ratios, the first piston assembly including a first piston positioned within the first combustion chamber.

This invention discloses a variable frequency energy-saving screw vacuum pump, relating to the field of screw vacuum pump technology. It includes an energy-saving device, a pumping chamber, an air inlet, an exhaust port, and a drive component. The drive component drives the male and female screws within the pumping chamber to rotate. The pumping chamber compresses and discharges air, gradually evacuating the working space into a vacuum. It can work in conjunction with a frequency converter. During the operation of the screw vacuum pump, the compression ratio and bypass channel opening can be dynamically adjusted according to the changing pumping requirements at different process stages, allowing it to operate within a more ideal working range. During the vacuum pump start-up and shutdown transition phase, the bypass channel is opened and the compression ratio is reduced to minimize wasted work. During the pumping phase, the bypass channel is closed, and a lower compression ratio reduces energy loss, thus achieving energy savings. During the stable operation phase, the compression ratio is increased to ensure pumping efficiency, thereby achieving adaptive matching for different operating conditions.

A compressor protection control method of an air conditioner type range hood is characterized in that the control method firstly monitors the compression ratio of a refrigerating system, if the compression ratio exceeds a set value, the opening degree of an electronic expansion valve is reduced, then the superheat degree of an evaporator of the refrigerating system is detected, and if the superheat degree of the evaporator is larger than the set value, the opening degree of the electronic expansion valve is reduced. If yes, the opening degree of the electronic expansion valve is increased. Compared with the prior art, the compressor protection control method has the advantages that the high-low pressure ratio of a refrigerating system and the superheat degree of an evaporator can be adjusted by controlling the opening degree of the electronic expansion valve, the compressor is effectively protected, effective control over the refrigerating system is achieved, and after the compressor is shut down, the temperature of a winding is detected, so that the compressor is protected. And the compressor can be restarted when the winding temperature is lower than the lower limit set temperature, and efficient operation of the refrigerating system is ensured.