CN212131981U - Multifunctional temperature control type engine oil seal device - Google Patents

Multifunctional temperature control type engine oil seal device Download PDF

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Publication number
CN212131981U
CN212131981U CN202020522157.1U CN202020522157U CN212131981U CN 212131981 U CN212131981 U CN 212131981U CN 202020522157 U CN202020522157 U CN 202020522157U CN 212131981 U CN212131981 U CN 212131981U
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China
Prior art keywords
oil
switch
oil tank
pressure
air
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Expired - Fee Related
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CN202020522157.1U
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Chinese (zh)
Inventor
杨小凯
任再青
韩斐
朱丹
答宇航
刘建
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Air Force Engineering University of PLA Aircraft Maintenace Management Sergeant School
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Air Force Engineering University of PLA Aircraft Maintenace Management Sergeant School
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Priority to CN202020522157.1U priority Critical patent/CN212131981U/en
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Publication of CN212131981U publication Critical patent/CN212131981U/en
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Abstract

The utility model discloses a multi-functional temperature control type engine oil seal device, adopt compressed air to pressurize fluid, compressed air arrives the pressure reducer from the air conditioning bottle after air filtering and filters and reduces pressure, the air after the decompression is carried out the pressure regulation by the pressure regulator again, the air reaches the oil tank after the pressure regulation, the safety valve that sets up between gas circuit gas charging switch and oil tank, fluid in the oil tank is pushed out the oil tank under compressed air's effect, reach the oil outlet joint through oil blanket switch control after oil filtering and filtering, then reach engine or air generator through the high-pressure hose, utilize the electrical control system to heat the dehydration, when needing to heat, the temperature control appearance switches on the working circuit of electromagnetism stove through the relay, the electromagnetism stove begins to work; when the temperature needs to be reduced, the temperature controller can cut off the working circuit of the induction cooker through the relay, the induction cooker automatically stops working, and the cooling switch can be used for controlling the cooling fan, so that the cooling time of lubricating oil is shortened. The utility model discloses oil blanket quality and work efficiency can be improved.

Description

Multifunctional temperature control type engine oil seal device
Technical Field
The utility model relates to an oil blanket device especially relates to a multi-functional temperature control type engine oil seal device.
Background
The basic requirements for ensuring the cleanliness of working media and preventing oil pollution are to ensure the normal work of each system of an aeroengine, maintenance regulations of various types of airplanes specify that 'the use of airplanes for more than three months is interrupted, the engines are returned to factory for overhaul or new engines leave factory, oil sealing is required', an oil sealing device is one of special equipment indispensable to the use and maintenance of the engines, is important ground equipment for ensuring the normal work of the systems and the flight safety, and the oil sealing equipment used by the prior army has poor universality and lagged dehydration means, and cannot effectively ensure the high cleanliness of oil.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the defects of the prior art are overcome, and the multifunctional temperature control type engine oil seal device capable of improving the quality and the working efficiency of an oil seal is improved.
The utility model discloses a technical scheme who solves technical problem and take is:
the utility model provides a multi-functional temperature control type engine oil seal device, includes main automobile body, pipe-line system, control lubricating oil heats the electrical control system of dehydration and makes things convenient for operating personnel to control the control panel board of oil seal device, the main automobile body is for the box structure automobile body that has the gyro wheel, pipe-line system with electrical control system sets up inside the main automobile body, control panel board sets up on the outside up end of main automobile body, control panel board with pipe-line system with electrical control system connects, pipe-line system is by being used for providing the compressed air of certain pressure and flow to the oil tank for fluid in the oil tank comprises gas pipe-line system and fluid pipe-line system that certain pressure and flow, gas pipe-line system includes cold gas bottle, inflation connection, gas filter, check valve, pressure reducer, brake pressure regulator and gas charging switch, the air conditioning bottle is connected with the inflation connector, compressed air in the air conditioning bottle reaches the pressure reducer after being filtered by the air filter to be decompressed, air after being decompressed reaches the oil tank through the inflation switch after being subjected to pressure regulation by the brake pressure regulator, the one-way valve is arranged between the air filter and the pressure reducer, a system pressure gauge is arranged between the one-way valve and the pressure reducer, one side of the system pressure gauge is provided with a first metering interface, an oil tank pressure gauge is arranged between the brake pressure regulator and the inflation switch, one side of the oil tank pressure gauge is provided with a second metering interface, a safety valve for ensuring system safety is arranged between the inflation switch and the oil tank, the oil pipeline system comprises an oil tank, an oil filter, an oil seal switch and an oil outlet connector, and oil in the oil tank is pressed out by the oil tank under the action of the compressed air, the oil is filtered and then reaches the oil outlet joint on equipment under the control of an oil seal switch, and then reaches an engine or an air generator through a high-pressure hose; the electric control system comprises a relay, a temperature controller, a heat radiation fan, a heating switch and an induction cooker for heating and dehydrating lubricating oil, wherein a thermocouple is arranged in the oil tank and connected with the temperature controller, the temperature controller is connected with a 220V alternating current power supply, the relay and the heat radiation fan are respectively connected with the 220V alternating current power supply, the induction cooker is connected with the relay, the heating switch is connected with the induction cooker, the heat radiation fan is connected with a heat radiation indicator lamp in parallel, the heat radiation switch is arranged between the heat radiation indicator lamp and the power supply, the power supply indicator lamp is connected with the 220V alternating current power supply in parallel, and a fuse and the power supply switch are sequentially connected between the power supply and the power supply indicator lamp; the control console panel is provided with a switch, an instrument, an interface and a pressure regulating valve, and the pressure regulating valve is connected with the inflation switch.
The inflation switch comprises a first inflation switch and a second inflation switch, the safety valve comprises a first safety valve and a second safety valve, the oil tank comprises a large oil tank and a small oil tank, the oil filter comprises a first oil filter and a second oil filter, the oil seal switch comprises a first oil seal switch and a second oil seal switch, the oil outlet joint comprises a first oil outlet joint and a second oil outlet joint, one path of the brake pressure regulator is connected with the large oil tank through the first inflation switch and the first safety valve, the other path of the brake pressure regulator is connected with the small oil tank through the second inflation switch and the second safety valve, the large oil tank is connected with an engine by the first oil outlet joint after passing through the first oil filter and the first oil seal switch, the small oil tank is connected with the air generator through the second oil filter and the second oil seal switch by utilizing the second oil outlet joint.
The control console is characterized in that the switch arranged on the panel comprises a power switch, a cooling switch, a heating switch, a small oil tank inflation switch, an air generator oil seal switch, a large oil tank inflation switch and an engine oil seal switch, the cooling switch is connected with the cooling fan, the instrument comprises an oil tank pressure gauge dial and a system pressure gauge dial, the interface comprises a temperature controller and a thermocouple metering interface, an oil tank pressure gauge metering interface and a system pressure gauge metering interface, the pressure regulating valve controls the entering of the pressure inside the oil tank by regulating the opening and closing amount of the inflation switch, and the power switch, the cooling switch and the heating switch are provided with corresponding power indicator lamps, cooling indicator lamps and heating indicator lamps.
And the joints on the pipelines of the gas pipeline system and the oil pipeline system are connected by a cone angle of 74 degrees.
The pressure in the cold air bottle is 15MPa, the pressure reducer is a 50-pressure reducer, and the power of the induction cooker is 3600W.
The left end face of the main vehicle body is provided with a push handrail, the front side of the upper end face is provided with the control console panel, the rear side is provided with an oil inlet, the right end face is provided with an oil outlet, the front end face is provided with a switch door, and the switch door is provided with a handle.
Compressed air reaches 50 reducers from the air conditioning bottle after air filtering and filtering for reducing pressure, then the air pressure is reduced to 5MPa, namely 50 atmospheric pressures, the air after reducing pressure is regulated by the pressure regulator, the air reaches the oil tank after regulating pressure, in order to ensure the safety of the system, a safety valve is arranged between an inflating switch and the oil tank on an air path, the opening pressure of the safety valve is 0.4MPa, oil in the oil tank is pressed out of the oil tank under the action of the compressed air, the oil is filtered and then reaches an oil outlet connector through oil seal switch control, and then the oil reaches an engine or an air generator through a high-pressure hose.
According to the requirement of maintenance regulations, when an engine is subjected to oil sealing, used lubricating oil must be heated to 110 ℃ for dehydration, so that an electrical control system is arranged in the device, before heating, an operator inserts a socket in the device into a 220V ground power supply, then a power switch on a control panel is turned on, a temperature controller is connected with a thermocouple metering interface, the temperature controller is powered on at the moment, if the temperature of the lubricating oil is lower than a set value of 110 ℃, the temperature controller is connected with a working circuit of an induction cooker through a relay, and the induction cooker starts to work; if the temperature of the lubricating oil is higher than the set value by 110 ℃, the temperature controller can cut off the working circuit of the induction cooker through the relay, the induction cooker stops working automatically, and the cooling switch on the panel is used for controlling the electric fan and has the function of reducing the cooling time of the lubricating oil.
The utility model discloses an actively beneficial effect:
1. on one hand, the utility model utilizes the compressed air to carry out gas pressurization on the oil tank, and can carry out rapid pressure oiling to the system under the airtight condition, thereby ensuring the cleanliness of oil liquid; on the other hand, the temperature control is carried out by utilizing the electric control system, the lubricating oil can be automatically heated and dehydrated or cooled by utilizing the cooling fan according to the data transmitted by the thermocouple during oil sealing, the quality and the working efficiency of the oil sealing are improved, and the military benefit and the economic benefit are higher.
2. The utility model discloses in control the volume of opening and shutting of aerifing the switch through the air-vent valve, and then control compressed air's air input, the air input that utilizes compressed air comes the size of controlled pressure, can adjust controlled pressure according to the requirement of different models, application scope is wide.
3. The utility model discloses well oil outlet joint is the standard joint, and it transports engine or air generator with the lubricating oil through high-pressure hose, is applicable to the aircraft of multiple different models, and the commonality can be strong, has improved holistic work efficiency.
Drawings
FIG. 1 is a schematic structural view of a main body of the multifunctional temperature-controlled engine oil package of the present invention;
FIG. 2 is a piping connection diagram of a piping system in the multifunctional temperature-controlled engine oil package of the present invention;
FIG. 3 is a schematic circuit diagram of an electrical control system in the multifunctional temperature-controlled engine oil package of the present invention;
fig. 4 is a diagram of an operation control panel in the multifunctional temperature-controlled engine oil package of the present invention.
Detailed Description
The invention will be further explained and explained with reference to the drawings and the embodiments:
referring to fig. 1, 2, 3 and 4: in the figure, 1-a main vehicle body, 2-an operation console panel, 3-a cold air bottle, 4-an inflation joint, 5-an air filter, 6-a one-way valve, 7-a pressure reducer, 8-a brake pressure regulator, 9-a system pressure gauge, 10-a first metering interface, 11-a fuel tank pressure gauge, 12-a second metering interface, 13-a first inflation switch, 14-a second inflation switch, 15-a first safety valve, 16-a second safety valve, 17-a large fuel tank, 18-a small fuel tank, 19-a first fuel filter, 20-a second fuel filter, 21-a first oil seal switch, 22-a second oil seal switch, 23-a first oil outlet joint, 24-a second oil outlet joint, 25-a power switch, 26-a cooling switch and 27-a heating switch, 28-small oil tank inflation switch, 29-air generator oil seal switch, 30-large oil tank inflation switch, 31-engine oil seal switch, 32-oil tank pressure gauge dial, 33-system pressure gauge dial, 34-temperature controller and thermocouple metering interface, 35-oil tank pressure gauge metering interface, 36-system pressure gauge metering interface, 37-pressure regulating valve, 38-power indicator lamp, 39-cooling indicator lamp, 40-heating indicator lamp, 41-push handle, 42-oil inlet, 43-oil outlet, 44-switch door, 45-handle and 46-roller.
Example (b): a multifunctional temperature control type engine oil sealing device comprises a main vehicle body 1, a pipeline system, an electrical control system for controlling heating and dehydration of lubricating oil and an operation control panel 2 for facilitating an operator to control an oil sealing device, wherein the main vehicle body 1 is a box structure vehicle body with rollers 46, the pipeline system and the electrical control system are arranged inside the main vehicle body 1, the operation control panel 2 is arranged on the upper end face of the outer part of the main vehicle body 1, the operation control panel 2 is connected with the pipeline system and the electrical control system, the pipeline system is composed of a gas pipeline system and an oil pipeline system which are used for providing compressed air with certain pressure and flow for an oil tank so that oil in the oil tank flows out at certain pressure and flow, the gas pipeline system comprises a cold air bottle 3, an inflation connector 4, an air filter 5, a one-way valve 6, a pressure reducer 7, a brake pressure regulator 8 and an inflation switch, the air conditioning bottle 3 is connected with an inflation connector 4, compressed air in the air conditioning bottle 3 is filtered by an air filter 5 and then reaches a pressure reducer 7 for pressure reduction, the air after pressure reduction is subjected to pressure regulation by a brake pressure regulator 8 and then reaches an oil tank through an inflation switch, a one-way valve 6 is arranged between the air filter 5 and the pressure reducer 7, a system pressure gauge 9 is arranged between the one-way valve 6 and the pressure reducer 7, a first metering connector 10 is arranged on one side of the system pressure gauge 9, an oil tank pressure gauge 11 is arranged between the brake pressure regulator 8 and the inflation switch, a second metering connector 12 is arranged on one side of the oil tank pressure gauge 11, a safety valve for ensuring system safety is arranged between the inflation switch and the oil tank, an oil liquid pipeline system comprises an oil tank, an oil filter, an oil seal switch and an oil outlet connector, oil liquid in the oil tank is pressed out by the oil tank under the, then reaches the engine or the air generator through a high-pressure hose; the electric control system comprises a relay, a temperature controller, a cooling fan, a heating switch 27 and an induction cooker for heating and dehydrating lubricating oil, wherein a thermocouple is arranged in an oil tank and connected with the temperature controller, the temperature controller is connected with a 220V alternating current power supply, the 220V alternating current power supply is respectively connected with the relay and the cooling fan, the induction cooker is connected with the relay, the heating switch 27 is connected with the induction cooker, the cooling fan is connected with a cooling indicator lamp in parallel, the cooling switch is arranged between the cooling indicator lamp and a power supply, the 220V alternating current power supply is connected with a power indicator lamp 38 in parallel, and a fuse and a power switch 25 are sequentially connected between the power supply and the power indicator lamp 38; the control console panel 2 is provided with a switch, a meter, an interface and a pressure regulating valve 37, and the pressure regulating valve 37 is connected with an inflation switch.
The inflation switch comprises a first inflation switch 13 and a second inflation switch 14, the safety valve comprises a first safety valve 15 and a second safety valve 16, the oil tank comprises a large oil tank 17 and a small oil tank 18, the oil filter comprises a first oil filter 19 and a second oil filter 20, the oil seal switch comprises a first oil seal switch 21 and a second oil seal switch 22, the oil outlet connector comprises a first oil outlet connector 23 and a second oil outlet connector 24, one path of the brake pressure regulator 8 is connected with the large oil tank 17 through the first inflation switch 13 and the first safety valve 15, the other path of the brake pressure regulator is connected with the small oil tank 18 through the second inflation switch 14 and the second safety valve 16, the large oil tank 17 is connected with the engine through the first oil filter 19 and the first oil seal switch 21 and then utilizes the first oil outlet connector 23, and the small oil tank 18 is connected with the air generator through the second oil filter 20 and the second oil seal switch 22 and then utilizes the second oil outlet connector 24.
The switches arranged on the control console panel 2 comprise a power switch 25, a cooling switch 26, a warming switch 27, a small oil tank inflation switch 28, an air generator oil seal switch 29, a large oil tank inflation switch 30 and an engine oil seal switch 31, the cooling switch 26 is connected with a cooling fan, the instrument comprises an oil tank pressure gauge dial 32 and a system pressure gauge dial 33, the interfaces comprise a temperature controller and thermocouple metering interface 34, an oil tank pressure gauge metering interface 35 and a system pressure gauge metering interface 36, a pressure regulating valve 37 controls the pressure entering the oil tank through regulating the opening and closing amount of the inflation switch, and the power switch 25, the cooling switch 26 and the warming switch 27 are respectively provided with a corresponding power indicator 38, a cooling indicator 39 and a warming indicator 40.
The joints on the pipelines of the gas pipeline system and the oil pipeline system are connected by a cone angle of 74 degrees.
The pressure in the cold air bottle 3 is 15MPa, the pressure reducer 7 is a fifty pressure reducer 7, and the power of the induction cooker is 3600W.
The left end face of the main vehicle body 1 is provided with a push handle 41, the front side of the upper end face is provided with an operation control console panel 2, the rear side is provided with an oil inlet 42, the right end face is provided with an oil outlet 43, the front end face is provided with a switch door 44, and the switch door 44 is provided with a handle 45.
When the device is used, compressed air is adopted to pressurize oil, the compressed air is filtered by an air filter 5 from an air bottle 3 and then reaches a 50-pressure reducer 7 to be reduced in pressure, the air pressure is reduced to 5MPa, namely fifty atmospheric pressures, the pressure of the air after being reduced is regulated by a pressure regulator 8, and when the oil is opened greatly, the gas pressure is 0.3 MPa; when the oil seal is opened for a short time, the air pressure is 0.35MPa, the large time refers to an engine which is generally understood, the small time refers to a gas turbine starter which is used for starting the large time, the structure of the small time is basically the same as that of the large time, but the small time is simpler, the small time is started firstly when the engine is started, and then the small time is used for driving the large time to rotate; after pressure regulation, air reaches an oil tank, in order to ensure the safety of the system, a safety valve is arranged between an inflation switch and the oil tank on a gas circuit, the opening pressure of the safety valve is 0.4MPa, oil in the oil tank is pressed out of the oil tank under the action of compressed air, filtered by an oil filter and then reaches an oil outlet joint under the control of an oil seal switch, and then reaches an engine or an air generator through a high-pressure hose.
According to the requirement of maintenance regulations, when an engine is subjected to oil sealing, used lubricating oil must be heated to 110 ℃ for dehydration, so that an electrical control system is arranged in the device, before heating, an operator inserts a socket in the device into a 220V ground power supply, then opens a power switch 25 on a control panel 2, connects a temperature controller with a thermocouple metering interface 34, and then the temperature controller is electrified, and if the temperature of the lubricating oil is lower than a set value of 110 ℃, the temperature controller is connected with a working circuit of an induction cooker through a relay, and the induction cooker starts to work; if the temperature of the lubricating oil is higher than the set value of 110 ℃, the temperature controller can cut off the working circuit of the induction cooker through the relay, the induction cooker stops working automatically, and the cooling switch 26 on the panel 2 can be used for controlling the cooling fan to reduce the cooling time of the lubricating oil.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all equivalent modifications or changes made by those skilled in the art according to the present invention should be included in the protection scope of the claims.

Claims (6)

1. The utility model provides a multi-functional temperature control type engine oil seal device, includes main automobile body, pipe-line system, the electrical control system of control lubricating oil dehydration of heating and makes things convenient for operating personnel to control the control panel board of oil seal device, characterized by: the box structure automobile body of main automobile body for having the gyro wheel, pipe-line system with electrical control system sets up inside the main automobile body, the control panel sets up on the outside up end of main automobile body, the control panel with pipe-line system with electrical control system connects, pipe-line system is by being used for providing the compressed air of certain pressure and flow to the oil tank for fluid in the oil tank is with certain pressure and the gaseous pipe-line system and the fluid pipe-line system that the flow flows form, gaseous pipe-line system includes air conditioning bottle, gas connection, air filter, check valve, pressure reducer, brake voltage regulator and inflation switch, the air conditioning bottle with inflation connection connects, compressed air in the air conditioning bottle warp reach after the air filter arrives the pressure reducer decompresses, and air after the decompression reachs the oil tank through inflation switch after carrying out the pressure regulating by brake voltage regulator again, the one-way valve is arranged between the air filter and the pressure reducer, a system pressure gauge is arranged between the one-way valve and the pressure reducer, a first metering connector is arranged on one side of the system pressure gauge, an oil tank pressure gauge is arranged between the brake pressure regulator and the air charging switch, a second metering connector is arranged on one side of the oil tank pressure gauge, a safety valve for ensuring system safety is arranged between the air charging switch and the oil tank, the oil pipeline system comprises an oil tank, an oil filter, an oil seal switch and an oil outlet connector, oil in the oil tank is pressed out of the oil tank under the action of compressed air, and the oil is filtered by the oil filter, then reaches the oil outlet connector on equipment through the control of the oil seal switch, and then reaches an engine or an air generator through a high-; the electric control system comprises a relay, a temperature controller, a cooling fan, a heating switch and an induction cooker for heating and dehydrating lubricating oil, wherein a thermocouple is arranged in the oil tank and connected with the temperature controller, the temperature controller is connected with an alternating current power supply, the relay and the cooling fan are respectively connected with the alternating current power supply, the induction cooker is connected with the relay, the heating switch is connected with the induction cooker, a cooling indicator lamp is connected with the cooling fan in parallel, the cooling switch is arranged between the cooling indicator lamp and the power supply, a power indicator lamp is connected with the alternating current power supply in parallel, and a fuse and a power switch are sequentially connected between the power supply and the power indicator lamp; the control console panel is provided with a switch, an instrument, an interface and a pressure regulating valve, and the pressure regulating valve is connected with the inflation switch.
2. The multifunctional temperature-controlled engine oil seal device according to claim 1, characterized in that: the inflation switch comprises a first inflation switch and a second inflation switch, the safety valve comprises a first safety valve and a second safety valve, the oil tank comprises a large oil tank and a small oil tank, the oil filter comprises a first oil filter and a second oil filter, the oil seal switch comprises a first oil seal switch and a second oil seal switch, the oil outlet joint comprises a first oil outlet joint and a second oil outlet joint, one path of the brake pressure regulator is connected with the large oil tank through the first inflation switch and the first safety valve, the other path of the brake pressure regulator is connected with the small oil tank through the second inflation switch and the second safety valve, the large oil tank is connected with an engine by the first oil outlet joint after passing through the first oil filter and the first oil seal switch, the small oil tank is connected with the air generator through the second oil filter and the second oil seal switch by utilizing the second oil outlet joint.
3. The multifunctional temperature-controlled engine oil seal device according to claim 2, characterized in that: the control console is characterized in that the switch arranged on the panel comprises a power switch, a cooling switch, a heating switch, a small oil tank inflation switch, an air generator oil seal switch, a large oil tank inflation switch and an engine oil seal switch, the cooling switch is connected with the cooling fan, the instrument comprises an oil tank pressure gauge dial and a system pressure gauge dial, the interface comprises a temperature controller and a thermocouple metering interface, an oil tank pressure gauge metering interface and a system pressure gauge metering interface, the pressure regulating valve controls the entering of the pressure inside the oil tank by regulating the opening and closing amount of the inflation switch, and the power switch, the cooling switch and the heating switch are provided with corresponding power indicator lamps, cooling indicator lamps and heating indicator lamps.
4. The multifunctional temperature-controlled engine oil seal device according to claim 1, characterized in that: and the joints on the pipelines of the gas pipeline system and the oil pipeline system are connected by a cone angle of 74 degrees.
5. The multifunctional temperature-controlled engine oil seal device according to claim 1, characterized in that: the pressure in the cold air bottle is 15MPa, the pressure reducer is a 50-pressure reducer, the power of the induction cooker is 3600W, and the alternating current power supply is a 220V alternating current power supply.
6. The multifunctional temperature-controlled engine oil seal device according to claim 1, characterized in that: the left end face of the main vehicle body is provided with a push handrail, the front side of the upper end face is provided with the control console panel, the rear side is provided with an oil inlet, the right end face is provided with an oil outlet, the front end face is provided with a switch door, and the switch door is provided with a handle.
CN202020522157.1U 2020-04-10 2020-04-10 Multifunctional temperature control type engine oil seal device Expired - Fee Related CN212131981U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020522157.1U CN212131981U (en) 2020-04-10 2020-04-10 Multifunctional temperature control type engine oil seal device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020522157.1U CN212131981U (en) 2020-04-10 2020-04-10 Multifunctional temperature control type engine oil seal device

Publications (1)

Publication Number Publication Date
CN212131981U true CN212131981U (en) 2020-12-11

Family

ID=73688412

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020522157.1U Expired - Fee Related CN212131981U (en) 2020-04-10 2020-04-10 Multifunctional temperature control type engine oil seal device

Country Status (1)

Country Link
CN (1) CN212131981U (en)

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Granted publication date: 20201211