135 results about "Fluid temperature" patented technology

The invention discloses a fluid temperature and pressure partitioning and heat transfer prediction method under supercritical pressure, which comprises the following steps: firstly, constructing a dimensionless criterion SEN to quantitatively evaluate a fluid expansion effect, and then dividing heat transfer into a plurality of temperature and pressure intervals based on Nuexp / Nufc; for each partition and the constructed dimensionless criterion, a temperature interval of a dominant mechanism and characteristic parameters representing the dominant mechanism are extracted, and particularly, the reasonability of a single-phase fluid hypothesis and a two-phase fluid hypothesis can be rapidly judged through the constructed dimensionless criterion; and establishing a partition prediction model by adopting a mechanism and data dual-drive framework. And finally, calling the corresponding sub-model according to the working condition and processing the cross-region continuity to realize high-precision heat transfer prediction in the full working condition range. The method solves the problem that a traditional method is difficult to predict full-temperature pressure interval heat transfer at high precision, and can be used for precise thermal design of the supercritical working medium in thermal equipment such as boilers, heat regenerators and coolers.

The invention belongs to the technical field of industrial automation control, and relates to a seasoning filling PID parameter adaptive optimization control method and system. The method comprises the steps that the real-time temperature of fluid in a filling pipeline, the static pressure of a valve inlet, the instantaneous flow and a valve opening instruction are collected, and moving average filtering preprocessing is carried out; constructing a self-adaptive forgetting factor calculation model based on the viscosity-temperature characteristics, and calculating a current optimal forgetting factor according to the fluid temperature change rate, the flow prediction error and the fluctuation condition of the flow data; a recursive algorithm is used for identifying the system process gain online, and the proportional gain of a PID controller is calculated in real time according to the identified process gain and the ratio of the hydrostatic pressure to the standard reference pressure; and the gain is input into a controller, and a final valve opening instruction is generated in combination with integral and differential terms. According to the method, the dynamic adjustment of the algorithm memory length can be realized, the viscosity change can be quickly adapted, excessive filling and slow response are eliminated, and high-precision filling under complex working conditions is ensured.

The invention provides an aluminum alloy precision forging forming die multi-area independent temperature control system and method, the system comprises a forming die assembly, a force thermal decoupling support base, a fluid temperature control supply station and a main control unit, the forming die assembly comprises a plurality of heat conduction inserts separated by heat insulation isolation layers; a rigid bearing loop and a dynamic thermal control loop which are parallel to each other are integrated on the force thermal decoupling supporting base, the dynamic thermal control loop drives the high-thermal-conductivity telescopic thermal bridge and the interface flexible dielectric layer to ascend and descend through a displacement actuator, and in a non-forging state, the thermal bridge supports the heat conduction insert and maintains a safety gap with the rigid bearing stand column; in the forging impact stage, the heat conduction insert moves downwards to eliminate the safety gap, the rigid bearing stand column bears the forming load, the main control unit adjusts the output force of the actuator according to temperature feedback, and the contact thermal resistance is adjusted and controlled in real time by changing the interface contact pressure. The problem that a precise temperature control assembly is difficult to bear forging impact is solved, and quick and precise response of multi-area independent heat flow is achieved.

A hydraulic system (12) for an aircraft (10), wherein the hydraulic system (12) includes a hydraulic power pack (14), a hydraulic fluid reservoir (28) and a hydraulic pump (30), a hydraulic consumer (18), a high-pressure supply line (38) supplying the hydraulic consumer (18) with hydraulic fluid under higher pressure, and a low-pressure return line (40) returning hydraulic fluid under lower pressure from the hydraulic consumer (18); heating device (42) with a short-cut line (44) connecting the high-pressure supply line (38) with the low-pressure return line (40) and a heater valve (46) for opening and closing the short-cut line (44), and a control and monitoring unit (43). Temperature management includes automatically controlling a fluid temperature by monitoring the fluid temperature and controlling the heater valve (46).

A cooling system includes one or more cooling panels for affecting a cooling load in an environment. The cooling system also includes a heat exchanger coupled to the one or more cooling panels. Each cooling panel includes a film, a panel body, an inlet port, an outlet port, and a fluid path. The film's radiative properties allow it to achieve a temperature less than an environment temperature. The heat exchanger includes ports that are coupled to the fluid paths of the one or more cooling panels. A control system is used to control flow rates, flow paths, fluid temperatures, component temperatures, cooling rates, component operation, or other aspects of a cooling system. For example, the control system controls or monitors pumps, compressors, fans, valves, sensors, actuators, or a combination thereof.

The invention relates to the technical field of crossing of mechanical engineering and thermodynamics, in particular to novel intermittent piston equipment. The device is characterized by comprising a gas-liquid cylinder system, a piston system, a feeding system, a discharging system and a cooling system, wherein the gas-liquid cylinder system comprises a plurality of partition plates with holes and can further comprise a plurality of monitoring control assemblies, and the piston system comprises a plurality of piston push plates with holes and a plurality of piston driving mechanisms and can further comprise a plurality of monitoring control assemblies. The cooling system comprises a plurality of thermal contact modules, a plurality of heat transfer modules and a plurality of heat dissipation terminals, and can further comprise a plurality of monitoring control assemblies. A perforated partition plate, a perforated piston push plate and a monitoring control assembly are additionally arranged in an existing piston equipment technology, meanwhile, piston pushing and cooling system cooling integrated intermittent operation is adopted, the position of a piston and fluid pressure are monitored in real time, a driving signal is dynamically adjusted, and the working efficiency is improved. Efficient conversion between mechanical energy and gas pressure energy, hydraulic energy or fluid heat energy and precise control over the fluid temperature are achieved, the compression, expansion and mass transfer and heat transfer efficiency of fluid in equipment is greatly improved, the technical application scene is wide, and the technical application value is high.

This invention provides a permanent antistatic PC material preparation system, comprising a mixing unit, an extrusion granulation unit, and an injection molding unit connected in sequence. The injection molding unit includes a barrel, a screw assembly rotatably disposed within the barrel, and an ERT sensor disposed at a nozzle at the end of the barrel. The ERT sensor includes an electrode array for online acquisition of electrical impedance tomography (EIT) data of the melt passing through the nozzle. The screw assembly includes a screw spindle with a longitudinally penetrating internal heat conduction oil channel. This internal heat conduction oil channel is connected to an external temperature control system via a connector. One section of the barrel is a compression section. A segmented thermal response sleeve is fitted around the outer periphery of the screw spindle within the compression section. The outer surface of the thermal response sleeve is provided with an outer peripheral conveying spiral. The thermal response sleeve responds to changes in the fluid temperature within the internal heat conduction oil channel by generating radial expansion displacement, thereby dynamically adjusting the compression ratio by changing the effective root diameter of the screw assembly within the compression section.

The application relates to the field of temperature control valves, and provides a temperature control valve system which comprises a first three-way valve, a second three-way valve, a temperature sensor, a delivery pump and a control terminal, forms multiple different circuits, utilizes the temperature sensor to monitor the fluid temperature in a first pipeline in real time, utilizes the control terminal to control the opening and closing and opening degree of each valve according to the data monitored by the temperature sensor, and timely reduces or increases the temperature, and improves the response speed. The application also provides an air wave therapeutic instrument provided with the temperature control valve system, which comprises a capsule body, the temperature control valve system and a cold water tank. The application has the effects that the temperature is adjusted by using the human body temperature of a user, the cost of the air wave therapeutic instrument is reduced, green environmental protection is realized, meanwhile, the temperature of the whole system is ensured to be not too high, and the effect of avoiding scalding is achieved.

The invention relates to a temperature control device (1) for temperature control of a fluid, comprising: at least one fluid supply (11), at least one fluid discharge (12), and at least one fluid transport element (13), wherein the fluid transport element (13) comprises a drive (131) and at least one fluid conveying element (132) connected to the drive (131), and the drive (131) moves the fluid conveying element (132) as required, wherein the fluid conveying element (132) is in contact with the fluid at least partially, and when the drive (131) is activated, the fluid conveying element (132) transports fluid from the fluid supply (11) to the fluid discharge (12). The fluid conveying element (132) comprises an elastocaloric material at least partially. The invention also relates to a vehicle with a temperature control device (1) and a method for temperature control of a fluid.

The present application relates to the field of seismic physical simulation experiment, and discloses a kind of seismic physical simulation experiment device and method, and the seismic physical simulation experiment device includes the closed chamber for containing reservoir model and filling fluid, the ultrasonic detection device for detecting reservoir model, the fluid control system for controlling the pressure of fluid and the temperature control system for controlling the temperature of fluid, and reservoir model is immersed in fluid.The present application seismic physical simulation experiment device places reservoir model in the fluid in closed chamber, adjusts the fluid pressure in closed chamber using fluid control system, adjusts the fluid temperature in closed chamber using temperature control system, so that the environment temperature and pressure where reservoir model is located are consistent with the real reservoir to be simulated;The data of reservoir model are comprehensively collected by ultrasonic detection device, so that experimental data closer to the simulated real reservoir can be obtained.

The invention relates to an offshore CCUS well building shaft temperature and pressure coupling calculation method which comprises the following steps: substituting an initial temperature and pressure profile of a shaft into a shaft drilling fluid density prediction model to obtain drilling fluid density, and substituting the initial temperature and pressure profile into a rheological property prediction model to obtain drilling fluid viscosity; fluid pressure in the drill stem and fluid pressure in the annulus are obtained; all nodes with shaft pressure prediction differences meeting the precision requirement are selected; the fluid temperature is updated through the temperature model and the fluid density of the node with the difference value meeting the precision requirement of the wellbore pressure prediction difference value of the node; according to the fluid with the updated temperature, adjacent nodes with the shaft pressure prediction difference meeting the precision requirement are selected; selecting nodes corresponding to all fluids of which the circulating flowing time in the shaft meets the preset time requirement from all nodes of which the shaft pressure prediction difference meets the precision requirement; and taking the temperature and the pressure of the node meeting the requirements as final wellbore temperature and pressure profiles.

The invention belongs to the technical field of water supply equipment, and particularly discloses a valve device and water supply equipment. A valve body assembly of the valve device is provided with a first port communicated with the hot water channel, a second port communicated with the cold water channel and a valve cavity communicated with the first port and the second port, and a communication port is formed in the valve cavity. The valve element assembly comprises a valve element capable of being axially and movably installed in the valve cavity, a blocking piece and a temperature adjusting piece, wherein the blocking piece and the temperature adjusting piece are both connected to the valve element. The blocking piece is used for opening or blocking the communicating opening. The temperature adjusting piece can change deformation force acting on the valve element according to the fluid temperature of the first port. When the fluid temperature is lower than the preset temperature, the fluid pressure of the first port can enable the valve element to overcome the deformation force so that the communication port can be communicated; when the fluid temperature is higher than the preset temperature, the blocking piece blocks the communicating opening. The valve device has the one-way conduction function and the temperature sensing function, the machining cost is reduced, no complex pipeline system exists, the cost is reduced, and the reliability of water supply equipment is improved.

The invention provides an in-use heat exchanger energy efficiency evaluation method and system based on the first law of thermodynamics. The method comprises the following steps: acquiring volume flow, temperature and pressure of cold and hot fluid of a heat exchanger under an in-use working condition and pressure measuring hole ground clearance data; the total heat transfer coefficient, the cold fluid pressure drop and the hot fluid pressure drop of the heat exchanger under the working condition are calculated; stipulating the flow velocity and qualitative temperature of cold and hot fluid of the heat exchanger under a standard working condition; calculating the total heat transfer coefficient, the cold fluid pressure drop and the hot fluid pressure drop correction, and calculating the total heat transfer coefficient, the cold fluid pressure drop and the hot fluid pressure drop of the in-use heat exchanger under the standard working condition; the energy efficiency index value of the in-use heat exchanger under the standard working condition is calculated, and energy efficiency grades are divided. The total heat transfer coefficient correction and the pressure drop correction are introduced, and the influence of dirt in the heat exchanger on energy efficiency is fully considered. By specifying the standard working condition, the evaluation result is not affected by the fluid temperature and flow velocity, and the stability is good.

The invention relates to a liquid-propellant rocket engine test assembly, in particular to a detachable plug-in temperature sensor mounting mouthpiece, and solves the technical problems that an existing temperature sensor mounting mouthpiece is poor in measurement accuracy, cannot be detached, wastes cost and is complex to mount, so that the simulation test efficiency is low. The detachable plug-in temperature sensor installation mouthpiece comprises a step joint, a spherical joint, a first mouthpiece installation cylinder and a second mouthpiece installation cylinder. The lower end of the step joint is connected with the upper end of the spherical joint; a first step hole matched with the plug-in temperature sensor in shape is formed in the step joint, and a first through hole matched with the plug-in temperature sensor in shape is formed in the spherical joint; the first through hole is communicated with the first stepped hole; the second mouthpiece mounting cylinder is used for fixing the plug-in temperature sensor in the step joint; the first mouthpiece mounting cylinder is used for fixing the lower end of the spherical joint inserted into the tee joint in the tee joint so as to measure the temperature of fluid in the tee joint.

The invention relates to a heat dissipation device which is provided with a first main channel, a second main channel and a first liquid outlet area arranged between the first main channel and the second main channel, and the first liquid outlet area is provided with a first branch channel communicating with the first main channel and a second branch channel communicating with the second main channel. The heat dissipation device is further provided with a liquid inlet and a liquid outlet which are communicated with the outside, the first main channel and the second main channel are communicated with the liquid inlet, and the first branch channel and the second branch channel are communicated with the liquid outlet. And the flow direction of fluid in the first branch channel is opposite to that of fluid in the second branch channel. According to the countercurrent layout, an original monotonically rising temperature curve is converted into mutually balanced bidirectional temperature distribution, the fluid temperature uniformity is improved, the surface temperature distribution of the chip in contact with the wall surface of the channel is more uniform, the overall flow resistance is reduced, the pressure drop is reduced, and the heat dissipation efficiency is improved.

This application discloses a method, apparatus, and storage medium for simulating vehicle motor temperature, belonging to the field of vehicle motor development technology. The method includes: acquiring a physical model and boundary conditions of the motor, wherein the physical model is a volume mesh model; determining a mathematical model based on the physical model of the motor; applying the boundary conditions and the mathematical model to the physical model of the motor to solve for the motor cooling flow field and the motor temperature field; wherein the solid wall temperature and near-wall fluid temperature in the heat transfer conservation equation between the fluid and solid in the mathematical model are real-time measured values. This method can simultaneously obtain the motor cooling flow field and the motor temperature field, simplifying the calculation process, shortening the acquisition time of the motor cooling flow field and the motor temperature field, and more accurately reflecting the motor temperature situation.

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.

A method for determining adulteration of a fluid under test is provided. The method comprises flowing the fluid under test through a sensor. A fluid temperature threshold is stored, and a temperature of the fluid under test deviating from the fluid temperature threshold is measured. An instance of fluid adulteration is determined.

A system for determining a coefficient of heat exchange between a fluid and a medium at a surface in contact with the fluid, comprising a temperature measurement device comprising: a multilayer structure comprising: four thin ceramic layers, and three metal tracks, a resistive temperature sensor attached to the multilayer structure and intended to be in contact with the fluid to measure a fluid temperature TF, the system further comprising a computer.

A method is provided for the controlled routing of hydronic flow within a climate control system. The method includes determining a condition type request for a plurality of area zones corresponding to a particular thermal zone. The method further includes determining a supply temperature type associated with at least a supply line of a primary supply loop and a supply line of a secondary supply loop. The supply temperature type is indicative of a thermal transport fluid temperature within the respective supply line. The method further includes providing an actuation signal set to a valve assembly. The actuation signal set is configured to describe a position for each value of the valve assembly and the position for each valve is based on the conditioning type request and the determined supply temperature types.

Drive (11) for a sash of a window or door, in particular a door closer, with a drive mechanism (13) for moving the sash, a drive housing (15) in which the drive mechanism (13) is at least partially arranged, a hydraulic fluid (17), in particular oil, which is contained in the drive housing (15), and a volume compensation element (19) which is arranged inside the drive housing (15), wherein the volume compensation element (19) comprises a compensation housing (23) which is at least partially filled with a gas (20), in particular air, wherein the compensating housing (23) has an outflow opening (27) through which the hydraulic fluid (17) flows into the volume compensation element (19) when the fluid temperature increases under compression of the gas (20) and flows out of the volume compensation element (19) when the fluid temperature decreases under expansion of the gas (20), characterized in that wherein a rolling diaphragm (21) is provided within the compensation housing (23), which retains the gas (20) in the compensation housing (23) and hermetically separates it from the hydraulic fluid (17), and which, when the hydraulic fluid (17) flows through the outflow opening (27), performs a stroke movement caused by the flowing hydraulic fluid (17), in which a head (30) of the rolling diaphragm (21) is linearly displaced, and that the compensating housing (23) includes a closing element (25) which has a flow-dependent check valve (29) which closes the outflow opening (27) when a back pressure of the hydraulic fluid (17) occurring outside the volume compensating element (19) is above a predetermined value, so that no hydraulic fluid (17) can flow into the volume compensating element (19).

The process temperature estimation system (200) includes a mounting assembly (202) configured to mount the process fluid temperature estimation system to the exterior surface (116) of the process fluid conduit (100). A hot end thermocouple (314) is thermally coupled to the exterior surface (116) of the process fluid conduit (100). A resistance temperature detector (RTD) (310) is spaced apart from the hot end thermocouple (314). A measurement circuit (228) is coupled to the hot end thermocouple (314) and configured to detect an electromotive force (emf) of the hot end thermocouple (314) and a resistance of the RTD (310) that vary with temperature to provide sensor temperature information. The controller (222) is coupled to the measurement circuit (228) and is configured to measure a reference temperature based on the resistance of the RTD (310) and generate an estimated process temperature output using heat transfer calculations using the reference temperature, the electromotive force (emf) of the hot end thermocouple (314), and the known thermal conductivity of the process fluid conduit (100).

The utility model provides a fluid temperature control system which comprises a compression circulation module, a liquid conveying module, a gas temperature control module and a control module, the compression circulation module is connected with a heat exchanger of the liquid conveying module and a heat exchanger of the gas temperature control module, and energy generated by the compression circulation module is used for heat exchange. The liquid conveying module and the gas temperature control module adjust the fluid to a target temperature or humidity through individual heat exchangers, and then the fluid is supplied to a demand end.

An electric power converter (100) including a first channel (10) for a cooling gas (101) to flow in, a second channel (20) for a cooling fluid (102) to flow in, at least one first temperature determining device (14) configured for determining a first gas temperature in the first channel (10), at least one first humidity determining device (16) configured for determining a first humidity in the first channel (10), at least one second temperature determining device (24) arranged for determining a second fluid temperature in the second channel (20), and a controller (50) in connection with said sensor device. The controller (50) being configured to determine a dew point of the cooling gas (101) based on the determined first gas temperature and the first humidity, and determine a condensation risk based on the determined dew point and the second temperature.

The utility model provides an injection temperature receptor and an injection delivery system. The injection temperature receptor comprises a shell assembly and a temperature sensor. An injection channel is arranged in the shell assembly, and the injection channel is provided with a liquid injection port and a liquid outlet which are oppositely arranged; the temperature sensor is used for being electrically connected with a monitor, and one end of the temperature sensor is arranged on the side, close to the liquid injection opening, in the injection channel so as to be used for detecting the temperature of injection injected into the injection channel and sending the temperature to the monitor. When the injector injects injection into the central venous catheter, the injection flows through the injection temperature sensor, and a temperature sensor of the injection temperature sensor can monitor the temperature of the injected injection and send the temperature to the monitor, so that an operator knows the temperature and the injection starting time when the injection is injected; the injection temperature sensor can accurately record the temperature of the injection and the injection starting time in real time by being connected with a monitor, manual recording is replaced, and therefore the detection accuracy is improved, and diagnosis errors are prevented.

This invention discloses a load-based liquid cooling system, comprising: a load heat exchange structure for absorbing heat from a load device; a flow regulating device for regulating the flow rate of fluid entering the load heat exchange structure; an adsorption refrigeration system for absorbing heat from an introduced heat source fluid to prepare a cryogenic fluid, including a heat source fluid inlet for introducing the heat source fluid, wherein the fluid exiting the fluid outlet of the load heat exchange structure can form a heat source fluid for supplying to the heat source fluid inlet; and a controller capable of controlling the flow regulating device to adjust the flow rate according to the temperature of the fluid exiting the fluid outlet of the load heat exchange structure, so that the temperature of the fluid exiting the fluid outlet of the load heat exchange structure is within a preset temperature range. The above-described load-based liquid cooling system effectively solves the problem of low heat source utilization in current adsorption refrigeration equipment. This invention also discloses a method for controlling the temperature of the load device.

The present application relates to the technical field of oil and gas well completion, and discloses a method and device for regulating supercritical state of bottom fluid of a well fractured by supercritical carbon dioxide. The method comprises the following steps: liquid CO2 fluid in a storage tank is injected into a wellbore in sequence after being heated and pressurized by a fracturing pump truck, and the CO2 fluid at the entrance of the wellbore reaches a preset temperature; the CO2 fluid at the preset temperature is in a supercritical state when reaching the bottom of the well through the wellbore; when the temperature of the CO2 fluid at the entrance of the wellbore is lower than the preset temperature, the input power of a heating device is increased; when the temperature of the CO2 fluid at the entrance of the wellbore is higher than the preset temperature, the input power of the heating device is reduced. The method keeps the temperature of the CO2 fluid near the bottom of the well at about 32 DEG C during the whole fracturing process, prevents the decrease of the carrying capacity of supercritical CO2 for proppants due to excessively high temperature, avoids the accelerated settlement of the proppants due to the existence of a large section of supercritical CO2 fluid in the wellbore, and saves the cost of heating low-temperature CO2 fluid on the ground.

A method for torque control of an internal combustion engine of a vehicle according to a transmission hydraulic pressure, comprising: providing an internal combustion engine torque converter connected to the internal combustion engine and an automatic transmission of the vehicle, the internal combustion engine torque converter being configured to distribute the torque of the internal combustion engine to the wheels of the vehicle; confirming (S10), by an internal combustion engine torque control device (10), whether a turbine speed differential satisfies an internal combustion engine torque control entry condition during the shifting of the automatic transmission; calculating (S20), by the internal combustion engine torque control device (10), a required turbine torque to prevent a shift shock using at least one of a turbine angular acceleration, a driving resistance torque, or a clutch magnet torque; performing (S30),by the internal combustion engine torque control device (10), using a turbine torque factor learning, as a stored value of the turbine torque factor learning, a result obtained by applying an accelerator pedal value and / or an internal combustion engine torque and / or a transmission fluid temperature at the beginning of the actual shifting operation, to an entry condition of the turbine torque factor learning under the condition that no breakaway occurs during the shifting operation, applying an average turbine acceleration or an average internal combustion engine torque reference reduction to a condition to prevent the turbine torque factor learning, and generating and storing the result of the turbine torque factor learning according to the shift time that started at the actual shift start point, convert (S40), by the internal combustion engine torque control device (10),of the stored value of the turbine torque factor learning into an internal combustion engine torque control value by the required turbine torque, and applying, by the internal combustion engine torque control device (10), the internal combustion engine torque control value to the output of the internal combustion engine.

A method for determining the temperature of a fluid flowing through a line body includes: generating a thermal model of the line body, the model being suitable for calculating the time curve of the surface temperature of a measurement section of the exterior of the line body from a known time curve of the fluid temperature; and continuously repeating the following steps: calculating the surface temperature of the measurement section of the line body exterior using the thermal model on the basis of an estimated value of the fluid temperature; measuring the surface temperature of the measurement section of the line body exterior; correcting the estimated value of the fluid temperature such that the measured surface temperature has the highest degree of probability on the basis of the corrected estimated value of the fluid temperature in the thermal model; and outputting the corrected estimated value of the fluid temperature.

Drive (11) for a sash of a window or door, in particular a door closer, with a drive mechanism (13) for moving the wing, a drive housing (15) in which the drive mechanism (13) is at least partially arranged, a hydraulic fluid (17), in particular oil, which is contained in the drive housing (15), and a volume compensation element (19) which is arranged inside the drive housing (15), wherein the volume compensation element (19) comprises an elastically compressible compensation body (21) consisting of a closed-cell foam, in particular particle foam, a compensation housing (23) with a housing opening into which the compensation body (21) is inserted, and a closing element (25) closing the housing opening, wherein the closure element (25) has an outflow opening (27) through which the hydraulic fluid (17) flows into the volume compensation element (19) when the fluid temperature increases under compression of the compensating body (21) and flows out of the volume compensation element (19) when the fluid temperature decreases under expansion of the compensating body (21), characterized by the fact that the closure element (25) has a flow-dependent check valve (29) which closes the outflow opening (27) when a back pressure of the hydraulic fluid (17) occurring outside the volume compensation element (19) is above a predetermined value, so that no hydraulic fluid (17) can flow into the volume compensation element (19).