151 results about "Heating oil" patented technology

The invention discloses a self-powered temperature control and dynamic thermal compensation system, and belongs to the technical field of energy recovery and intelligent thermal management, the self-powered temperature control and dynamic thermal compensation system comprises a vibration energy capture and power generation subsystem and a bidirectional thermal compensation subsystem, the vibration energy capture and power generation subsystem comprises a piezoelectric array, a thermoelectric module and an energy storage device; the piezoelectric array is used for capturing vibration energy and converting the vibration energy into first electric energy, the thermoelectric module is used for conducting thermoelectric conversion through the temperature difference between the interior and the exterior of an oil tank to generate second electric energy, and the first electric energy and the second electric energy are stored in the energy storage device. The bidirectional thermal compensation subsystem comprises a thermoelectric refrigeration sheet, the thermoelectric refrigeration sheet is used for consuming electric energy in a low-temperature environment to heat the oil liquid, refrigerating the oil liquid in a high-temperature environment and converting waste heat into third electric energy, and the third electric energy is stored in the energy storage device. Self power supply is achieved through vibration energy and temperature difference generated in the vehicle running process, and stable temperature control over the oil tank can be achieved in the extreme environment.

The invention discloses a reusable superconducting coil vacuum pressure impregnation tool and method, and relates to the technical field of superconducting coil preparation tools. Comprising a dipping tool cylinder, an upper cover plate, a lower cover plate, a coil outer support, a superconducting coil and a coil inner support, the two ends of the dipping tool barrel are detachably connected with the upper cover plate and the lower cover plate respectively; a vacuum joint is arranged on the upper cover plate; a glue injection opening is formed in the side wall of the dipping tool barrel; the coil outer support is arranged on the inner side of the superconducting coil, the coil inner support is arranged on the outer side of the superconducting coil, the coil outer support, the superconducting coil and the coil inner support are arranged on the lower cover plate, and the space between the coil outer support and the inner wall of the dipping tool barrel is filled with epoxy blocks. The device can adapt to superconducting coils of different sizes only by increasing or decreasing the volume of the filling epoxy block, the dipping tool does not need to be destructively disassembled when the coils are taken out, and it is ensured that the temperature is uniform when the whole tool is heated and cured through heating oil in an interlayer of the dipping tool.

A gas turbine engine fuel system includes a fuel delivery system, an oil cooling subsystem, a fuel delivery conditioning system, and one or more optical coking sensors. The fuel delivery subsystem delivers fuel to a gas turbine engine and the oil cooling subsystem receives heated oil from the gas turbine engine. The fuel delivery conditioning system includes a fuel / oil cooler that is in fluid communication with the fuel delivery subsystem to receive the fuel and is in fluid communication with the oil cooling subsystem to receive the heated oil. The fuel / oil cooler transfers heat from the oil to the fuel to increase a temperature of the fuel, and the optical coking sensors output a signal indicating a thermal stress of the fuel that occurs with a changing temperature of the fuel. A controller receives the voltage signal determines an onset of coking in the fuel based on the signal.

To provide a microwave cooker and a cooking method capable of shortening a cooking time with a simple structure.SOLUTION: The microwave cooking apparatus 1 heats and cooks an object to be cooked in liquid by irradiating the object with microwaves. The microwave cooking device 1 includes an oil tank 20 that stores oil, a heating member 40 that is provided in the oil tank 20 and heats the oil stored in the oil tank 20, and an irradiation member 50 that is disposed inside the oil tank 20 and heats food F in the oil by irradiating the food F with microwaves. The irradiation member 50 includes a microwave irradiation port 52 disposed inside the oil tank 20.SELECTED DRAWING: Figure 2

The oil filling equipment comprises an oil tank placing main body, an oil tank main body and a control center, an oil tank fixing mechanism is arranged at the top of the oil tank placing main body, and the oil tank main body is limited and fixed through the oil tank fixing mechanism and is slidably connected to the top of the oil tank placing main body; an oil pump for conveying oil to the transformer is mounted on the outer surface wall of the oil tank body; a limiting metal block and a fixing base are arranged at the top of the oil tank body, a control center connecting mechanism is arranged on the fixing base, the control center is detachably installed on the fixing base through the control center connecting mechanism, the control center is electrically connected with the oil pump so as to control the oil conveying flow and pressure of the oil pump, and a double-rotating-rod heating and stirring mechanism is arranged in the oil tank body. The driving assembly drives the outer rotating rod and the inner rotating rod to rotate reversely, and the heating assembly synchronously rotates along with the rotating rods and heats oil. Therefore, uniform heating and full stirring of the insulating oil liquid in a low-temperature environment can be realized, the viscosity of the oil liquid is effectively reduced, and the oil filling quality and efficiency are improved.

The application discloses a catalytic combustion heater principle prototype, which comprises an air tank, a methane tank, a mixed gas tank and a combustion chamber, the air tank is connected with the mixed gas tank through a connecting pipeline, the gas outlet of the mixed gas tank is connected with the methane tank and the combustion chamber through two connecting pipelines respectively, the top of the combustion chamber is provided with a mixed gas inlet, and a blower is arranged outside the combustion chamber, the application simulates the operation state of the underground catalytic combustion heater, high-temperature tail gas released by catalytic combustion mixed gas is used for heating oil shale layers, so that the oil shale is pyrolyzed to obtain the purpose of exploiting oil and gas, the simulation reference result of the experimental prototype can be understood as the actual operation result, the application not only reduces the exploitation cost of the oil shale in-situ conversion exploitation, but also improves the oil and gas exploitation efficiency, reduces the exploitation cost and reduces the harm of the toxic tail gas generated by incomplete combustion to animals, plants and the environment caused by direct release of the toxic tail gas into the atmosphere.

The invention discloses an oil shale in-situ conversion and carbon sequestration method by injecting high-temperature carbon dioxide and cooperating with sodium capsules, and belongs to the technical field of fossil energy in-situ exploitation and carbon sequestration. The method comprises the following steps: firstly, determining a target development area and formulating a corresponding development strategy; then, the oil shale reservoir is subjected to fracturing transformation; then, the oil shale reservoir is heated, supercritical carbon dioxide is injected, and displacement recovery is conducted; then, sodium capsule suspension fluid is injected into the oil shale reservoir, and solid-phase geological storage is achieved; and finally, after oil and gas exploitation reaches the economic limit, all the injection wells and the production wells are closed, and final geological storage is completed. According to the method, the carbon dioxide geological sequestration technology and the oil shale in-situ conversion process are deeply fused, the oil shale recovery efficiency is remarkably improved, the geological sequestration of the carbon dioxide is synchronously achieved, and the method has important significance in the fields of carbon emission reduction and fossil energy in-situ exploitation.

The invention discloses a sheet type graphene heating device for vehicle methanol fuel and a heating method of the sheet type graphene heating device, and belongs to the technical field of heating devices.The sheet type graphene heating device for the vehicle methanol fuel comprises an oil tank used for containing the methanol fuel, the oil tank is sleeved with a protection box, and a plurality of graphene heating sheets making contact with the bottom face of the oil tank are installed on the inner bottom face of the protection box; the device further comprises a moving mechanism, two stirring mechanisms and a driving mechanism. According to the plate type graphene heating device for the vehicle methanol fuel, the graphene heating plates, the protection box, the moving mechanism and the stirring mechanism are arranged, the multiple graphene heating plates are started to heat the oil tank, then the methanol fuel in the oil tank is heated, and meanwhile, multiple stirring rods in the stirring mechanism rotate and move up and down in the oil tank, so that the methanol fuel in the oil tank is heated; methanol at the middle upper part of the oil tank is mixed to avoid temperature stratification with cold upper part and hot lower part.

This utility model discloses a make-up air structure for a board material purification system, including an insulated box with an air inlet and an air outlet connected end-to-end. A heating oil pipe is located at the bottom of the insulated box, with the air outlet below the heating oil pipe and the air inlet at the top of the insulated box. The heating oil pipe is connected to a thermal oil heater. An exhaust system is connected to the insulated box, and the air inlet and outlet are connected via an air supply pipe. A circulating fan is installed on the air supply pipe, and a make-up air pipe is connected to the air supply pipe. This utility model can supplement fresh air into a board material purification system with a thermal circulation structure to maintain air quality and pressure balance within the insulated box.

The embodiment of the utility model provides a heating bowl which comprises a bowl body made of breathable materials, and at least three heating parts are arranged on the bowl body. According to the embodiment, the contact area between the heating part and the ointment is increased on the heating bowl, and the ointment is heated to heat, evaporate and atomize oil liquid of the ointment body. The utility model further provides atomization equipment which comprises a hopper body provided with an air suction channel and further comprises the heating bowl, an air collection cavity for installing the heating bowl is formed in the hopper body, and the air suction channel is communicated with the air collection cavity. According to the embodiment, the air suction channel is communicated with the air collection cavity, the ointment is not burnt in the heating process of the heating bowl, the ointment is heated, evaporated and atomized through heating, atomized smoke contains particles heavier than air, as long as external airflow interference is avoided, meanwhile, hot air which rises from the periphery and is burnt and heated is isolated, and the hot air does not carry the smoke to rise; smoke can sink into the gas collection cavity through the heating bowl and then is sucked out through the gas suction channel.

The utility model relates to the technical field of dyeing equipment, and discloses an efficient temperature-controlled dyeing equipment, which includes a dyeing tank. An installation frame is slidably arranged on the top surface of the dyeing tank. The installation frame is U-shaped. A flow disturbance structure for making the temperature of the dyeing solution uniform is arranged on one side of the dyeing tank, and a temperature control structure for controlling the temperature of the dyeing solution is arranged on the outer wall surface of the dyeing tank. Through the arrangement of the flow disturbance structure and the temperature control structure, the staff injects heating oil into the jacket, and starts the heating coil through the PLC controller to heat the heating oil and the dyeing tank. The temperature sensor monitors the temperature in real time and feeds it back to the PLC controller after reaching the set range to control the heating coil to stop heating. The motor drives the connecting shaft to rotate, and the fixed shaft slides and reciprocates in the annular groove, thereby pushing the flow disturbance plate to stir the dyeing solution, promoting the mixing of the bottom layer and the upper layer, preventing precipitation, the circulation pump continuously extracts the bottom layer dyeing solution and transports it to the upper layer, enhancing the flow, heating evenly, avoiding temperature difference, and improving the dyeing effect.

Various disclosed embodiments include oil warming systems, electric motors, and vehicles. In an illustrative embodiment a system includes an oil reservoir, a motor stator, and an oil pump. The oil reservoir is configured to hold oil therein. The motor stator is positioned such that at least a portion thereof is positioned within the oil reservoir where the at least the portion of the motor stator is in thermal communication with the oil while the oil reservoir includes the oil therein. The motor stator is configured to warm the oil while in an oil warming mode. The oil pump is fluidly coupled to the oil reservoir and is configured to draw oil out of the oil reservoir.

The utility model provides a steel base alloy powder waste residue solid-liquid separation device which comprises a horizontal stirring tank, a sealing outer cover and a water storage tank, a variable frequency motor is installed at the right end of the horizontal stirring tank, a rotating shaft is installed in the horizontal stirring tank through a sealing bearing, and a rotating impeller set is installed on the annular side face of the rotating shaft. The horizontal stirring tank is sleeved with the sealing outer cover in a sealed mode, the sealing outer cover is filled with heating oil, and the problems that according to existing steel-based alloy powder waste residue treatment equipment, heating is not uniform enough, the separation efficiency of steel-based alloy powder waste residue grease, inorganic salt and metal powder is affected, and waste heat is inconvenient to recycle are solved; the device is reasonable in structural design, the separation rate of grease, inorganic salt and metal powder in steel-based alloy powder waste residues can be increased, the separation efficiency is good through a uniform heating mode, after the device is used, waste heat of heating oil can be recycled, energy waste is reduced, and the device is convenient to popularize and apply.

The utility model discloses a lubricating oil mixing device, which comprises a tank body, a lubricating oil mixing device and a lubricating oil mixing device, the stirring mechanism comprises a stirring paddle and a motor for driving the stirring paddle to rotate, the stirring paddle is vertically arranged in the tank body, and the stirring paddle is used for stirring an oil agent; the lifting mechanism comprises a connecting ring, a plurality of lifting plates arranged on the inner side of the connecting ring and a first power part for driving the connecting ring to ascend and descend, the radial outer surface of the connecting ring is matched with the inner side of the tank body, the stirring paddle is contained in the connecting ring, and the lifting plates are arranged in the circumferential direction of the connecting ring; and the heating mechanism comprises a heating pipe, the heating pipe is located between the connecting ring and the stirring paddle, and the heating pipe is used for heating an oil agent. According to the utility model, the mixing period can be greatly shortened, and sufficient and uniform mixing is ensured.

The hot melting equipment for plastic processing comprises a bottom column, a heat preservation tank mechanism is fixedly installed at the upper end of the bottom column, a mixing heating cavity is formed in the inner side of the heat preservation tank mechanism, a mixing tank is fixedly installed in the heat preservation tank mechanism, and a discharging port is formed in the lower end of the mixing tank. And a discharge valve is fixedly mounted at the lower end of the discharge port. According to the hot melting equipment for plastic processing, heating oil can be injected into the mixed heating cavity through an oil injection opening, the mixed heating cavity can be heated through cooperation with a heating rod, heat preservation and heat insulation can be conducted on the interior through a first heat preservation layer and a heat insulation layer of the heat preservation tank mechanism, heat dissipation to the surrounding environment is reduced, energy saving and cost reduction are facilitated, and the practicability is high. And through cooperative use of the spiral conveyor, the second heat preservation layer and the ceramic heating ring, heat preservation and heating can be conducted on the melt during discharging, the situation that the fluidity of the melt becomes poor due to the temperature difference in the discharging process is prevented, and the quality and consistency of subsequent products are improved advantageously.

The utility model provides a flow channel structure of vacuum pump exhaust filter, including shell and a plurality of filter core in the shell, the bottom of shell is provided with shell recess, the top surface of shell recess is inclined, the bottom of shell is fixed with base, the shell bottom and base are sealed through seal ring, the shell recess is equipped with the shell recess, the top surface of shell recess is equipped with the seal ring, and the seal ring is equipped with the seal ring. The shell is provided with a groove, so that the groove of the shell forms an interlayer in a sealed state, the shell is provided with a water inlet and a water outlet which are communicated with the interlayer, and a bent flow channel is arranged in the interlayer. Compared with the prior art, the runner structure of the vacuum pump exhaust filter has the advantages that the water inlet interlayer is arranged at the bottom of the shell, and the runner is arranged in the interlayer, so that the cooling of the whole shell, the filter element in the shell and exhaust airflow is realized, the filtering effect of the filter element is ensured, and the service life of the filter element is ensured; the flow channel can be used for cooling and heating oil, and when condensable gas is extracted, in order to prevent gas condensation from polluting working oil, the oil generally needs to be heated.

This utility model discloses a rotary RTO device for treating chemical waste gas, relating to the field of RTO equipment. It includes a device body, a top seat mounted on the top of the device body, a detection component installed in the inner cavity of the top seat, a ceramic packing bed installed at the bottom of the inner cavity of the device body, a rotary valve installed at the bottom of the device body, an exhaust pipe mounted on the top side of the top seat, a chimney mounted on the side of the exhaust pipe, a gas delivery component mounted on the outer wall of the device body, a filter screen installed in the inner cavity of the gas delivery component, and a heating oil pipe installed in the inner cavity of the device body. This rotary RTO device for treating chemical waste gas, through the heating oil pipe, can heat the device body during operation. The two oil pipes also allow for the circulation of the heating oil, preheating the chemical waste gas before it enters the gas delivery component, thereby improving the energy utilization rate of the device body during operation.

The utility model relates to the technical field of hot melt adhesive recycling equipment, and discloses a hot melt adhesive waste recycling device which comprises a heating box, a box cover is arranged above the heating box, the heating box is composed of an inner shell and an outer shell, the inner shell is arranged on the inner side of the outer shell, a metal hose is arranged between the heating box and the box cover, and the metal hose is connected with the heating box. A valve is arranged on the surface of the metal hose, and a resistance wire heater is arranged on the outer side face of the heating box. According to the waste material recycling device, waste materials are added into the heating box through the feeding pipe, then the resistance wire heater is started, heating oil between the inner shell and the outer shell is heated, then the heating oil is pumped to the box cover and the main mandrel under the action of the centrifugal pump and finally flows back to the position between the inner shell and the outer shell, and in the flowing process, the waste materials are recycled. The hot melt adhesive is heated in the inner direction and the outer direction, the heat transfer time is shortened, the temperature rising speed of the hot melt adhesive waste is increased, the heating period is effectively shortened, and therefore the production efficiency is improved.

The utility model relates to the technical field of oil exploitation, and discloses an oil field wellhead heating and viscosity reducing device which comprises two clamping covers and an arc groove, the two clamping covers are symmetrically close to each other, the arc groove is formed in the inner side surface of each clamping cover, and an electromagnetic heating pipe close to the arc groove is fixedly embedded in each clamping cover. Side plates close to each other are fixed to the middles of the two sides of the front end clamping cover and the rear end clamping cover, grooves are formed in the upper portion and the lower portion of the surface of each side plate, magnets are fixedly embedded into the grooves, and the side plates at the front end and the rear end are attracted and fixed through the magnets. According to the technical scheme, the electromagnetic heating pipe is embedded and fixed into the clamping cover, the metal oil pumping pipe can be heated through electromagnetic induction in the using process, the purpose of heating oil and reducing viscosity is achieved, the clamping cover is attracted and fixed through the magnets on the side plates in a magnetic attraction mode, the fixing mode is simpler, and using is more convenient. And the position fixed on the outer ring of the oil pumping pipe can be selectively changed, so that the device can be conveniently detached for maintenance, and can be protected and stored when not used.

The utility model provides a heating system of a low-temperature drilling machine. The heating system comprises a fuel tank; the heating oil suction pipe is fixedly installed in the top of the fuel tank, and a first oil pipe heating connector is fixedly installed at the output end of the heating oil suction pipe. According to the heating system of the low-temperature drilling machine, fuel oil is extracted from the fuel tank and heated through cooperative operation of the heating oil suction pipe and the heating filter, and then the heated fuel oil is conveyed to the diesel engine and the fuel oil heater. The fuel oil heater heats cooling liquid in the engine water tank and hydraulic oil in the hydraulic oil tank, and then the diesel engine is started to provide heat energy for the operation room and the storage battery box. Therefore, the tedious steps that a steam boiler heating system needs to independently supply water to the boiler and soften water are avoided, the problem that water source supply is not guaranteed in the severe environment of a well site is solved, and the risk of equipment operation faults caused by the water source problem is reduced.

The application belongs to the technical field of power cryogenic cold start engineering and discloses a gearbox oil circuit system, a crane and a gearbox oil circuit system starting method. The gearbox oil circuit system comprises a gearbox body, a gearbox oil circuit, a heating circulating oil circuit and a detection control unit. The heating circulating oil circuit comprises a heating oil tank which is arranged independently of the gearbox body and an electric heater which is arranged in the heating oil tank. The heating oil tank and the gearbox body are communicated through a pipeline. The detection control unit can detect the temperature of the gearbox oil in the gearbox body and control the electric heater and an electric bypass valve. The heating oil tank which is arranged independently of the gearbox body can provide sufficient space to install a larger-power electric heater. The large-power electric heater can ensure that the gearbox oil is rapidly heated to a normal starting temperature under extremely cold conditions, so that the gearbox oil circuit system can also be normally started under extremely cold conditions.

The application discloses a shale oil in-situ modification method and device based on an underground nuclear radiation mode, and the method comprises the following steps: carrying out a nuclear radiation field simulation experiment; according to the nuclear radiation field simulation experiment result, establishing a corresponding model of radiation and in-situ modification shale oil production, and determining specific nuclear radiation parameters; according to the nuclear radiation field simulation experiment result, selecting and determining an experimental area with the best shale geological characteristics; inserting the shale oil in-situ modification device of the underground nuclear radiation mode into the experimental area with the best shale geological characteristics, and setting the specific nuclear radiation parameters; adjusting the nuclear radiation parameters, and starting a production well to produce. The shale oil in-situ modification device of the underground nuclear radiation mode comprises a radiation layer pipeline and a heating device, the heating device is located in the radiation layer pipeline, the radiation layer pipeline is used for storing radiation agents, and the heating device is used for heating oil-containing reservoirs in the medium-low maturity shale.

The utility model discloses a difference gilding roller set, belongs to the technical field of gilding rollers, and solves the problems that an existing gilding roller is single in function and low in production efficiency. The gilding roller set comprises mounting plates arranged on the two sides, gilding rollers are rotationally arranged on the mounting plates on the two sides, a plurality of first protruding blocks used for gilding reticulate patterns are arranged on the gilding rollers, and the first protruding blocks are linearly arranged and arranged on the outer surfaces of the gilding rollers in a surrounding mode. A plurality of second protruding blocks used for hot stamping of solid patterns are arranged between every two adjacent rows of first protruding blocks, the second protruding blocks are linearly arranged and arranged on the outer surface of the hot stamping roller in a surrounding mode, a lower pressing roller is arranged above the hot stamping roller, and the two ends of the lower pressing roller are rotationally installed on installation plates on the two sides. A heating cavity is formed in the gold stamping roller, and heating oil is arranged in the heating cavity. According to the difference gold stamping roller set, the same-roller difference gold stamping technology is achieved, and the production efficiency and the percent of pass are improved.

The utility model discloses and provides an MDI formaldehyde-free plywood continuous flat pressing production line sizing system, which comprises a glue spraying device and a feeding device, the glue spraying device comprises a conveying belt and a spray gun mechanism, the feeding device comprises a glue storage tank and a heating oil tank, the output end of the glue storage tank is connected with the spray gun mechanism through one end of a glue loop pipe, and the other end of the glue loop pipe is connected with the heating oil tank. The other end of the glue loop pipe is connected with the first input end of the glue storage tank, a glue applying pump is arranged on the glue loop pipe, a plurality of heating pipes cover the outer side of the glue loop pipe, the output end of the heating oil tank is connected with a heating oil conveying pipe, and the heating oil conveying pipe sequentially passes through the heating pipes and then is connected with the input end of the heating oil tank to form a loop. And a heating oil pump is arranged on the heating oil conveying pipe. The glue storage tank and the heating oil conveying pipe are arranged, a circulating loop is formed through a pipeline, the temperature of glue is maintained through heating oil while glue is supplied, and after paving pauses, the situation that atomization cannot be achieved due to the fact that the glue temperature drops is avoided.

The utility model discloses a high-temperature gas-phase U-shaped tubular condenser which comprises a tube box, a heat exchanger and a heat exchanger, the tube plate is connected with the tube box; the barrel is provided with a hot oil gas inlet, the hot oil gas inlet is communicated with the interior of the barrel, the axis of the hot oil gas inlet is tangent to the inner wall of the barrel, and the barrel is connected with the tube plate; and the U-shaped tube bundle is arranged in the cylinder body. Through the application of the high-temperature gas-phase U-shaped tubular condenser, an enough thermal expansion space can be provided through the U-shaped tube bundle, so that thermal stress caused by temperature change is effectively relieved, safe and stable operation of the condenser can be ensured under the condition that the temperature difference of heat exchange media is large, and the service life of the condenser is prolonged. The risk that a traditional tube type heat exchanger is prone to sealing-off leakage is avoided; in addition, by means of the unique tangential hot oil gas inlet and the guide plate, the hot oil gas can be in a rotary flowing state in the barrel, the retention time of the hot oil gas in the condenser can be prolonged, and the heat exchange efficiency is improved.

The utility model discloses a kind of oil heater of quick heating, comprising: oil heater main body, expansion assembly and movable assembly, the outside of oil heater main body is provided with multiple heat dissipation ring plates for heat dissipation, expansion assembly includes the extension plate being set in the side of heat dissipation ring plate, the side of heat dissipation ring plate is provided with fixed part, the side of extension plate is provided with reinforcing part, the side of extension plate away from oil heater main body is provided with holding part, movable assembly is set in the bottom of oil heater main body;The utility model is provided with expansion assembly in the side of oil heater main body, multiple extension plates being set in the outside of heat dissipation ring plate in expansion assembly are limited by fixed part, heat dissipation ring plate heat conduction to extension plate with heat loss using extension plate, compared with existing heat dissipation ring plate, the heat transfer area of heat dissipation ring plate is increased by the external equipment of extension plate in the design, and then the transmission of heat is accelerated, the rapid heating of air temperature is realized.

A system powers a heating element with switched direct current (DC) power. The high-speed switching of the heating element triggers lattice excitation in the element alloy, heating up the element. Multiple heating elements heat up a plate on which oil sands can be deposited. The heated plate heats up the oil sands, allowing the bitumen to flow away from the sand.

The utility model discloses a grease heating device, and belongs to the technical field of heating devices. The grease heating device comprises a heat insulation cover and a heating assembly, the heat insulation cover is provided with a heating cavity and an opening communicated with the heating cavity and formed in the bottom of the heating cavity, and the heating assembly is arranged on the heat insulation cover and used for heating the heating cavity. After the design is adopted, when grease needs to be heated, the oil drum does not need to be hoisted, only the heat insulation cover needs to be arranged outside the oil drum in a covering mode, the heating device is started, grease heating operation is simple, and grease heating is convenient; besides, due to the fact that heating is conducted through the heating device instead of the mode that water flow makes contact with the oil drum, even if the oil drum is in the uncovered state, the grease cannot be affected by water vapor and the like, and the grease quality can be guaranteed.

The invention provides an oil flushing control system which comprises a main control unit, a display operation unit and an oil temperature detection unit used for detecting the temperature of oil in a pipeline of oil flushing equipment. The flow detection unit is used for detecting the flow of oil in the pipeline; the pressure detection unit is used for detecting the pressure of oil in the pipeline; the liquid level detection unit is used for detecting the liquid level of oil in an oil tank of the oil flushing equipment; the filtering detection unit is used for detecting the blocking degree of a filter of the oil flushing equipment; the oil temperature control unit is connected with a heater in the oil tank so as to control heating of the heater; the oil pump control unit is connected with an oil pump of the oil flushing equipment so as to control the flow speed of the oil pump; and the filtering alarm unit is used for prompting that the filter is blocked. The automatic operation of the oil flushing equipment is controlled, and the oil flushing efficiency and stability are improved through automatic control.

The invention discloses an oil return control method of a heat pump unit and the heat pump unit. The heat pump unit comprises at least two compressors which are arranged in parallel, and each compressor is provided with an oil return switch; the oil return control method comprises the steps that the operation mode of the heat pump unit is obtained; if the operation mode is a refrigeration mode, a refrigeration oil return strategy is executed, and an oil return switch is dynamically adjusted according to the operation frequency, the environment temperature, the oil temperature superheat degree and the actual oil level height of a compressor; and if the operation mode is a heating mode, a heating oil return strategy is executed, and an oil return switch is dynamically adjusted according to the environment temperature of the compressor and the actual oil level height. The multi-dimensional parameters such as the environment temperature, the compressor operation frequency, the oil level height and the oil temperature superheat degree are collected, the oil return requirement characteristics of different modes are combined, an oil return switch is dynamically adjusted, on-demand oil return is achieved, the compressor abrasion risk is reduced, and the all-working-condition reliability of a heat pump unit is improved.