Two-stage vacuum oil filter

Abstract

The utility model provides a two-stage vacuum oil filter. The two-stage vacuum oil filter comprises a primary filtering device, a heating device, a separating device, an oil level monitoring device, a condensing device, a fine filtering device and a circulating device, the primary filtering device is communicated with the first oil inlet, and a first change-over valve is arranged on a pipeline; the oil outlet side of the fine filtration device is communicated with the second oil inlet, and a second change-over valve is arranged on a pipeline; the circulating device is communicated with the separating device and the heating device; the second oil inlet is also communicated with the oil inlet side of the heating device and is provided with a third change-over valve; the first oil inlet is also communicated with the oil outlet side of the fine filtration device and is provided with a fourth change-over valve; the primary filtering device, the heating device and the separating device are sequentially communicated. The double-stage vacuum oil filter has reliable oil filtering and purifying functions, and can also conveniently switch the valves for independently pumping oil, injecting oil, supplementing oil and the like, so that particles are filtered while oil transportation is achieved, and the problem that an oil inlet pipe and an oil outlet pipe of a double-stage vacuum oil filter in the prior art need to be switched for use is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum oil filters, in particular to a double-stage vacuum oil filter. Background Art

[0002] The vacuum oil filter is a product that performs on-site oil filtering and oil replenishment for various oil-immersed transformers, oil-immersed current and voltage transformers, and high-voltage and low-oil circuit breakers. It is also called a vacuum high-efficiency oil filter, oil filter, or vacuum oil purifier. The high-efficiency vacuum oil filter among transformer oil filters is also called a single-stage vacuum oil filter, which is a vacuum oil filter that only has heating and a vacuum pump. It can handle water and impurities, but cannot evacuate the transformer. The single-stage vacuum oil filter is mainly used in power plants, substations, electric power industry, railways, metallurgy and other industrial and mining enterprises to purify transformer oil, transformer insulating oil, circuit breaker oil, and switch oil. It can quickly and efficiently remove moisture, gas, impurities, water-soluble acids, etc. from the oil, and can improve the withstand voltage value of deteriorated oil products after treatment. It is an ideal equipment for the treatment of hydraulic oil and lubricating oil. The double-stage vacuum oil filter is based on the single-stage vacuum oil filter with a Roots pump. It has a high pumping speed and can quickly and efficiently remove water vapor from the oil, greatly improving the dryness of the oil, the breakdown voltage value, and the one-time filtering effect, shortening the oil treatment period, thereby improving the oil performance. It can also vacuum the transformer and can be used at high altitudes. The double-stage vacuum filter is widely used in the installation and maintenance of various large-scale transformer equipment for oil purification and vacuum hot oil circulation drying. It can also be used for transformer oil treatment in the main transformer box.

[0003] The oil inlet and outlet pipes of traditional bipolar vacuum oil filters are fixed pipes that cannot be interchanged, which limits the application scope of the equipment. In certain specific application scenarios, it may not meet operational requirements, reducing the adaptability and flexibility of the equipment. Due to the non-interchangeability of components, operators may need more complicated operating steps to complete the setup and adjustment of the equipment, which increases the difficulty of operation and may also increase the risk of operational errors. Utility Model Content

[0004] The main purpose of the utility model is to provide a double-stage vacuum oil filter to at least solve the problem that the oil inlet pipe and the oil outlet pipe of the double-stage vacuum oil filter in the prior art need to be switched.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a two-stage vacuum oil filter, comprising: a primary filter device, a heating device, a separation device, an oil level monitoring device, a condensing device, a fine filter device and a circulation device; the primary filter device is connected to a first oil inlet through a pipeline and a first conversion valve is arranged on the pipeline; the oil inlet side of the heating device is connected to the oil outlet side of the primary filter device through a pipeline; the oil inlet side of the separation device is connected to the oil outlet side of the heating device through a pipeline; the oil level monitoring device is arranged on the separation device; the condensing device is connected to the separation device through a pipeline; the oil inlet side of the fine filter device is connected to the oil outlet side of the separation device The oil outlet side of the fine filter device is connected through a pipeline and is connected to the oil filling port through a pipeline, and an oil filling valve is provided in the pipeline; the oil outlet side of the fine filter device is also connected to the second oil inlet through a pipeline, and a second conversion valve is provided in the pipeline; the oil inlet side of the circulation device is connected to the oil outlet side of the separation device through a pipeline, and a circulation valve is provided in the pipeline, and the oil outlet side of the circulation device is connected to the oil inlet side of the heating device through a pipeline; wherein, the second oil inlet is also connected to the oil inlet side of the heating device through a pipeline, and a third conversion valve is provided; the first oil inlet is also connected to the oil outlet side of the fine filter device through a pipeline, and a fourth conversion valve is provided.

[0006] Furthermore, temperature testers are provided at the connecting pipes of the first oil inlet and the second oil inlet.

[0007] Furthermore, the primary filter device includes: a primary filter and a first drain valve; the oil inlet side of the primary filter is connected to the first oil inlet and the second oil inlet, and the oil outlet side of the primary filter is connected to the heating device; the first drain valve is arranged at the bottom of the primary filter.

[0008] Furthermore, the heating device includes: a heater, a first oil drain valve, a high-temperature protection device and a constant temperature controller; the oil inlet side of the heater is connected to the oil outlet side of the primary filter device, and the oil outlet side of the heater is connected to the oil outlet side of the separation device; the first oil drain valve is arranged at the bottom of the heater; the high-temperature protection device is arranged on the heater to monitor the temperature of the heater; the constant temperature controller is connected to both the heater and the high-temperature protection device to control the heater.

[0009] Furthermore, the separation device includes: a vacuum separator, a second oil drain valve and an oil drain pump; the oil inlet side of the vacuum separator is connected to the oil outlet side of the heating device through a pipeline and an oil supply solenoid valve is arranged on the pipeline; the second oil drain valve is arranged at the bottom of the vacuum separator; the oil inlet side of the oil drain pump is connected to the oil outlet side of the vacuum separator through a pipeline and a check valve is arranged on the pipeline; the oil outlet side of the oil drain pump is connected to the oil inlet side of the fine filtering device and the oil inlet side of the circulation device; wherein the oil supply solenoid valve between the vacuum separator and the heating device is also connected in parallel with a bypass valve.

[0010] Furthermore, the oil level monitoring device includes: a foam sensor and an oil level controller; the foam sensor is arranged at a preset position on the inner wall of the vacuum separator; the oil level controller is connected to both the foam sensor and the second oil drain valve to control the second oil drain valve.

[0011] Furthermore, the condensing device includes: a condenser, a Roots vacuum pump, a cooler, a water storage tank and a vacuum pump; there are two condensers, both of which are connected to the separation device through a pipeline and are provided with a reflux valve; the connecting pipeline between one of the condensers and the separation device is provided with an aeration solenoid valve, and the other condenser is provided with a single exhaust valve; the Roots vacuum pump is connected to multiple condensers through a pipeline, and a vacuum exhaust valve, a vacuum gauge and a vacuum pressure sensor are provided on the pipeline; there are two coolers, which are connected to each other through a pipeline; one of the condensers is connected to the Roots vacuum pump through a pipeline; the water storage tank is connected to both coolers through a pipeline and a shut-off valve is provided on the pipeline; the water storage tank is provided with an aeration valve, a second sewage valve and a liquid level display screen; the vacuum pump is connected to another condenser through a pipeline and a liquid level compensator is provided on the pipeline.

[0012] Furthermore, the fine filtering device includes: a secondary filter and a fine filter; the oil inlet side of the secondary filter is connected to the separation device; a third drain valve is arranged at the bottom of the secondary filter; the oil inlet side of the fine filter is connected to the secondary filter through a pipeline and a first pressure gauge is arranged on the pipeline, and the oil outlet side of the fine filter is connected to the oil filling port through a pipeline and a sampling valve and an oil filling valve are arranged; a fourth drain valve is arranged at the bottom of the fine filter.

[0013] Furthermore, the circulation device includes: a safety valve, a second pressure gauge, a circulation valve and a pressure controller; the oil inlet side of the safety valve is connected to the oil outlet side of the separation device; the oil inlet side of the second pressure gauge is connected to the oil outlet side of the safety valve; the oil inlet side of the circulation valve is connected to the oil outlet side of the second pressure gauge; the pressure controller is connected to the second pressure gauge and the circulation valve to control the circulation valve.

[0014] The utility model discloses a two-stage vacuum oil filter, comprising: a primary filter, a heating device, a separation device, an oil level monitoring device, a condensing device, a fine filter and a circulation device; the primary filter is connected to a first oil inlet through a pipeline and a first conversion valve is arranged on the pipeline; the oil inlet side of the heating device is connected to the oil outlet side of the primary filter through a pipeline; the oil inlet side of the separation device is connected to the oil outlet side of the heating device through a pipeline; the oil level monitoring device is arranged on the separation device; the condensing device is connected to the separation device through a pipeline; the oil inlet side of the fine filter is connected to the oil outlet side of the separation device through a pipeline The oil outlet side of the fine filter device is connected to the oil filling port through a pipeline and an oil filling valve is provided on the pipeline; the oil outlet side of the fine filter device is also connected to the second oil inlet through a pipeline and a second conversion valve is provided on the pipeline; the oil inlet side of the circulation device is connected to the oil outlet side of the separation device through a pipeline and a circulation valve is provided on the pipeline, and the oil outlet side of the circulation device is connected to the oil inlet side of the heating device through a pipeline; wherein the second oil inlet is also connected to the oil inlet side of the heating device through a pipeline and a third conversion valve is provided; the first oil inlet is also connected to the oil outlet side of the fine filter device through a pipeline and a fourth conversion valve is provided. In addition to having a reliable oil filtration and purification function, this embodiment can also conveniently convert valves for separate oil extraction, oil injection, oil replenishment and other functions, so as to filter particles while delivering oil, solving the problem that the oil inlet pipe and the oil outlet pipe of the two-stage vacuum oil filter in the prior art need to be switched. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 It is a structural schematic diagram of a double-stage vacuum oil filter that can be selected according to an embodiment of the utility model.

[0017] The above drawings include the following reference numerals:

[0018] 10. Pre-filter device; 11. Pre-filter; 12. First drain valve; 20. Heating device; 21. Heater; 22. First drain valve; 23. High temperature protection device; 24. Constant temperature controller; 30. Separation device; 31. Vacuum separator; 311. Oil supply solenoid valve; 32. Second drain valve; 33. Oil drain pump; 34. Bypass valve; 40. Oil level monitoring device; 41. Foam sensor; 42. Oil level controller; 50. Condensation device; 51. Condenser; 511. Reflux valve; 512. Aeration solenoid valve; 513. Single exhaust valve; 52. Roots vacuum pump; 521. Vacuum exhaust valve; 522. Vacuum gauge; 523. Vacuum pressure sensor ; 53. Cooler; 54. Water storage tank; 541. Isolation valve; 542. Aeration valve; 543. Second blowdown valve; 544. Liquid level display screen; 55. Vacuum pump; 551. Liquid level compensator; 60. Fine filter device; 61. Oil filling valve; 62. Secondary filter; 621. Third blowdown valve; 63. Fine filter; 631. Fourth blowdown valve; 64. First pressure gauge; 65. Sampling valve; 70. Circulation device; 71. Circulation valve; 72. Safety valve; 73. Second pressure gauge; 74. Pressure controller; 80. First conversion valve; 90. Second conversion valve; 100. Third conversion valve; 110. Fourth conversion valve; 120. Temperature tester. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] A double-stage vacuum oil filter according to an embodiment of the utility model is as follows: Figure 1As shown, it includes: a primary filter device 10, a heating device 20, a separation device 30, an oil level monitoring device 40, a condensing device 50, a fine filter device 60 and a circulation device 70; the primary filter device 10 is connected to the first oil inlet through a pipeline and a first conversion valve 80 is arranged on the pipeline; the oil inlet side of the heating device 20 is connected to the oil outlet side of the primary filter device 10 through a pipeline; the oil inlet side of the separation device 30 is connected to the oil outlet side of the heating device 20 through a pipeline; the oil level monitoring device 40 is arranged on the separation device 30; the condensing device 50 is connected to the separation device 30 through a pipeline; the oil inlet side of the fine filter device 60 is connected to the oil outlet side of the separation device 30 through a pipeline, The oil outlet side of the fine filter device 60 is connected to the oil filling port through a pipeline and an oil filling valve 61 is provided on the pipeline; the oil outlet side of the fine filter device 60 is also connected to the second oil inlet through a pipeline and a second conversion valve 90 is provided on the pipeline; the oil inlet side of the circulation device 70 is connected to the oil outlet side of the separation device 30 through a pipeline and a circulation valve 71 is provided on the pipeline, and the oil outlet side of the circulation device 70 is connected to the oil inlet side of the heating device 20 through a pipeline; wherein, the second oil inlet is also connected to the oil inlet side of the heating device 20 through a pipeline and a third conversion valve 100 is provided; the first oil inlet is also connected to the oil outlet side of the fine filter device 60 through a pipeline and a fourth conversion valve 110 is provided. When this embodiment is used specifically, the first conversion valve 80 and the oil injection valve 61 are opened during normal use, and the second conversion valve 90, the third conversion valve 100 and the fourth conversion valve 110 are closed. The raw liquid is filtered from the first oil inlet through the primary filter device 10 to remove larger particle impurities and then enters the heating device 20 for heating. The raw liquid becomes coarse mist and enters the separation device 30. After the water in the raw liquid evaporates, the remaining oil mist forms an oil film. The oil film curve moves downward, resulting in a larger aeration area and a time retention process for aeration, thereby performing a sufficient demulsification, dehydration, and degassing separation process; the mixed gas formed by evaporated water vapor, light hydrocarbons and other gases enters the condensing device 50, the precipitated water is directly discharged, the water vapor and non-condensable gases enter the water storage tank 54, the cooled water is directly discharged, and the non-condensable gases are discharged through the vacuum pump 55. This embodiment can be used without changing the oil pipe. When in use, it is only necessary to open the third conversion valve 100 and the fourth conversion valve 110, close the first conversion valve 80, the second conversion valve 90 and the oil injection valve 61, and the original liquid can enter the double-stage vacuum oil filter from the second oil inlet through the third conversion valve 100 for oil filtration; the filtered oil flows out from the fine filter device 60 through the fourth conversion valve 110. This embodiment can eliminate particles, moisture, gas and other pollutants in the oil, and has the effect of reducing the acid value, so that the key indicators of the oil such as dielectric strength, water content, gas content, acid value, dielectric loss, etc. meet the qualified specification requirements, and maximize the safe operation of the user's electrical equipment.This embodiment is an independent oil purification and filtration system with a skid-mounted structure. It can be powered on for online circulation filtration, or moved to the oil filtration point for offline oil filtration. In addition to having a reliable oil filtration and purification function, it can also conveniently switch valves for separate oil extraction, oil injection, oil replenishment and other functions, so as to filter particles while delivering oil. The design of the operating valves and oil inlets and outlets is strictly optimized according to the working site environment and the workers' operating habits, so that the layout of the oil, gas and water pipelines is reasonable, the operation is convenient, and the whole machine is small, exquisite and beautiful. It solves the problem that the oil inlet and outlet pipes of the two-stage vacuum oil filter in the prior art need to be switched. The equipment parameters of the bipolar vacuum oil filter of this embodiment are shown in Table 1:.

[0021]

[0022]

[0023] In specific implementation, the connecting pipes of the first oil inlet and the second oil inlet are both provided with a temperature tester 120. The temperature tester 120 is used to measure the temperature of the inlet and outlet oil to achieve working oil temperature control.

[0024] In specific implementation, the primary filter device 10 includes: a primary filter 11 and a first drain valve 12; the oil inlet side of the primary filter 11 is connected to both the first oil inlet and the second oil inlet, and the oil outlet side of the primary filter 11 is connected to the heating device 20; the first drain valve 12 is arranged at the bottom of the primary filter 11. The primary filter 11 is the first line of defense, and the filter element of the primary filter 11 is usually designed to be a coarser filter material, mainly used to capture larger particles and coarse pollutants. This helps to prevent the primary filter 11 from clogging prematurely and prolong its service life; larger particulate matter is captured at this stage and discharged through the first drain valve 12, thereby protecting the finer filter element. The primary filter 11 of this embodiment adopts a tool-free quick-release filter made of stainless steel, and the filter element can be replaced in 30 seconds, and the inspection and maintenance are easy and quick; and the filter element of the primary filter 11 is interchangeable with international major brands, so that the cost of consumables, filtering accuracy and efficiency are controllable.

[0025] In specific implementation, the heating device 20 includes: a heater 21, a first oil drain valve 22, a high-temperature protection device 23 and a constant temperature controller 24; the oil inlet side of the heater 21 is connected to the oil outlet side of the primary filter device 10, and the oil outlet side of the heater 21 is connected to the oil outlet side of the separation device 30; the first oil drain valve 22 is arranged at the bottom of the heater 21; the high-temperature protection device 23 is arranged on the heater 21 to monitor the temperature of the heater 21; the constant temperature controller 24 is connected to both the heater 21 and the high-temperature protection device 23 to control the heater 21. The vacuum oil filter is designed based on the different boiling points of water and oil. The heater 21 adopts far-infrared radiation indirect heating technology and liquid flow heating control technology, and S-type assembly structure, which effectively prevents the generation of harmful gases in the oil filtering process and forms a safe and reliable heating system. The optimized pipeline design ensures that there is no "dead oil zone". The oil temperature can be adjusted and set arbitrarily, and the original liquid can be heated to 30-80℃; the temperature control adopts interval control to avoid frequent activation of the contactor when the oil temperature reaches the set temperature value, thereby maximizing the service life of the appliance; the first oil drain valve 22 is used to control the oil level in the heater 21, and the high-temperature protection device 23 is used for temperature overload protection control. The Italian INIT overload protection control technology is applied. When the main temperature control fails to control, the overload protector is activated. The constant temperature controller 24 is used for working oil temperature control. The PID temperature control technology is adopted, and the temperature control is accurate; the heating device 20 adopts the surface ultra-low load technology (surface load ≤ 0.5w) as a whole to avoid accidents caused by dry burning, avoid overheating and deterioration of oil quality, and avoid secondary pollution caused by gas generated during filtration.

[0026] Optionally, the heating device 20 adopts a modular component design, multiple groups of heaters 21 are concentrated in one module, and oil flow monitoring control is provided. The heater 21 will not be started until the oil flows normally.

[0027] In specific implementation, the separation device 30 includes: a vacuum separator 31, a second oil drain valve 32 and an oil drain pump 33; the oil inlet side of the vacuum separator 31 is connected to the oil outlet side of the heating device 20 through a pipeline and an oil supply solenoid valve 311 is provided on the pipeline; the second oil drain valve 32 is provided at the bottom of the vacuum separator 31; the oil inlet side of the oil drain pump 33 is connected to the oil outlet side of the vacuum separator 31 through a pipeline and a check valve is provided on the pipeline; the oil outlet side of the oil drain pump 33 is connected to the oil inlet side of the fine filter device 60 and the oil inlet side of the circulation device 70; wherein, the oil supply solenoid valve 311 between the vacuum separator 31 and the heating device 20 is also connected to a bypass valve 34. The oil drain pump 33 is used to pump the separated oil into the fine filter device 60, and a national standard high-efficiency motor is selected, which has sufficient power, works for a long time without overload and overheating, and is fully adapted to high vacuum suction; even if the whole system is in extreme vacuum, the oil pump still discharges oil normally, and the whole system has stable performance.

[0028] In specific implementation, the oil level monitoring device 40 includes: a foam sensor 41 and an oil level controller 42; the foam sensor 41 is set at a preset position on the inner wall of the vacuum separator 31; the oil level controller 42 is connected to the foam sensor 41 and the second oil drain valve 32 to control the second oil drain valve 32. The foam sensor 41 is used to monitor the oil level in the vacuum separator 31, and the oil level controller 42 controls the second oil drain valve 32 to open or close according to the oil level; the oil level monitoring device 40 enables the bipolar vacuum oil filter to achieve five levels of liquid level control technology, namely: low oil level dry running protection, high oil level balance control, ultra-high liquid level oil injection control, high vacuum foam control and anti-backflow control technology, so as to achieve no oil injection, oil leakage, no empty pump operation, and no cross contamination of purified oil and oil used in the oil filter.

[0029] Optionally, the separation device 30 and the oil level monitoring device 40 include the following features: (1) Introducing German three-dimensional thin film evaporation technology, consisting of an atomizer, a reactor, a separation chamber, an oil collection tank, a vacuum chamber, a defoamer, an observation window, and a liquid level meter; (2) Atomizer: atomizes the oil entering the vacuum separation system and sprays it onto the reactor; (3) Oil surface film reactor: It is composed of a corrugated filler composed of a plurality of Raschig rings or Pall rings, so that the oil mist sprayed onto the reactor forms an oil film, and the water and gas in the oil are evaporated as much as possible, greatly improving the efficiency of dehydration and degassing; (4) Separation chamber: It is located between the reactor and the oil collection tank. When the oil runs in this interval, water, gas, and The oil and liquid are separated again; (5) Oil collection tank: The oil and liquid separated from water and gas are collected and discharged by the oil discharge pump 33; (6) Vacuum chamber: The water vapor and residual gas separated in the reactor and separation chamber are extracted from the vacuum separation system to prevent water and gas from re-dissolving in the oil; (7) Foam controller: The vacuum detection control technology is adopted to automatically control the oil to generate oil bubbles, replacing the traditional method of generating foam and then defoaming, so as to achieve stable operation; (8) Air respirator: This machine applies gas convection separation technology, and the external air is filtered through ultra-fine drying, so that it can participate in the separation gas convection in an appropriate amount, and the moist harmful gas is sucked out by the vacuum pump 55. ⑼Observation window: tempered glass is used as the observation mirror to replace the defect of organic glass as the observation mirror when it is concave and deformed under high temperature and high vacuum conditions; ⑽ The triple automatic liquid level control device adopts infrared and stainless steel electric sensors for dual liquid level control to achieve automatic balance adjustment of inlet and outlet oil, and the constant oil filter system achieves the purpose of human-machine separation; the compound three-dimensional evaporation structure is adopted to increase the evaporation area and prolong the evaporation time of the purified oil in the vacuum separation system, greatly improving the efficiency of dehydration of free water and micro-water degassing.

[0030] In a specific implementation, the condensing device 50 includes: a condenser 51, a Roots vacuum pump 52, a cooler 53, a water storage tank 54 and a vacuum pump 55; there are two condensers 51, both of which are connected to the separation device 30 through pipelines and are provided with a reflux valve 511; a pipeline connecting one of the condensers 51 and the separation device 30 is provided with an aeration solenoid valve 512, and the other condenser is provided with a single exhaust valve 513; the Roots vacuum pump 52 is connected to the multiple condensers 51 through pipelines and a vacuum exhaust valve 52 is provided on the pipeline. 1. A vacuum gauge 522 and a vacuum pressure sensor 523; there are two coolers 53, which are interconnected through pipelines; one of the condensers 51 is connected to the Roots vacuum pump 52 through a pipeline; the water reservoir 54 is connected to both coolers 53 through pipelines and a shut-off valve 541 is provided on the pipeline; the water reservoir 54 is provided with an aeration valve 542, a second drain valve 543 and a liquid level display screen 544; the vacuum pump 55 is connected to the other condenser 51 through a pipeline and a liquid level compensator 551 is provided on the pipeline. The Roots booster pump is air-cooled, and its suction rate is more than 5 times that of the front vacuum pump 55. The extremely large suction rate effectively ensures that the ultimate vacuum can be reached quickly; the vacuum pump 55 uses a high-quality rotary vane vacuum pump 55, and its efficiency is about 20 times the flow rate. The ultra-large suction rate ensures the efficient performance of the vacuum separator 31; the vacuum pump 55 is also equipped with a non-return device to prevent the vacuum pump 55 from oil rising back during the startup and shutdown process, thereby consuming the pump oil and causing the vacuum pump 55 to be damaged due to lack of oil, thereby reducing the number of times the vacuum pump 55 oil is added; the vacuum pump 55 is equipped with a pump oil filter and an air filter to avoid long-term operation in harsh environments without jamming.

[0031] Optionally, the bipolar vacuum oil filter of this embodiment is provided with a vacuum exhaust port, which can evacuate the electrical equipment while filtering the oil, can also perform vacuum oil filling, and can also be used independently to become an independent vacuum exhaust unit; and an air-cooled pump structure is adopted to avoid the cumbersome problem of external cooling device.

[0032] In specific implementation, the fine filter device 60 includes: a secondary filter 62 and a fine filter 63; the oil inlet side of the secondary filter 62 is connected to the separation device 30; a third drain valve 621 is provided at the bottom of the secondary filter 62; the oil inlet side of the fine filter 63 is connected to the secondary filter 62 through a pipeline and a first pressure gauge 64 is provided in the pipeline, the oil outlet side of the fine filter 63 is connected to the oil filling port through a pipeline and a sampling valve 65 and an oil filling valve 61 are provided; a fourth drain valve 631 is provided at the bottom of the fine filter 63. The secondary filter 62 and the fine filter 63 use finer filter element materials, which can capture tiny particles and residual impurities. The goal of this stage is to improve the purification efficiency of the oil filter and ensure that the output oil quality meets the required standards. The secondary filter 62 is 20μm, using a stainless steel wire filter + a three-level imported polymer fiber material, which can be used repeatedly after cleaning; the fine filter element can be selected with a precision of 1-5um according to the user's oil viscosity and pollution. The filter element flux area is more than 20 times the rated flow rate, and even if most of it is blocked, it can still meet the needs of oil filtration and circulation.

[0033] Optionally, the fine filtration device 60 is equipped with a filter element contamination sensor and a pressure indicator to provide a monitor signal for the intelligent control of the electrical control cabinet, thereby ensuring the safety of the filtration system and reminding the operator to understand the use status of the filter element.

[0034] In specific implementation, the circulation device 70 includes: a safety valve 72, a second pressure gauge 73, a circulation valve 71 and a pressure controller 74; the oil inlet side of the safety valve 72 is connected to the oil outlet side of the separation device 30; the oil inlet side of the second pressure gauge 73 is connected to the oil outlet side of the safety valve 72; the oil inlet side of the circulation valve 71 is connected to the oil outlet side of the second pressure gauge 73; the pressure controller 74 is connected to both the second pressure gauge 73 and the circulation valve 71 to control the circulation valve 71. The second pressure gauge 73 is used to measure the oil pressure; the pressure controller 74 is used to control the opening and closing of the safety valve 72 according to the oil pressure; the circulation valve 71 is used to allow the oil to re-enter the heating device 20 for a new round of filtering; the safety valve 72 is used to urgently cut off the circulation pipeline to ensure production safety.

[0035] Optionally, the primary filter 11, the secondary filter 62, the fine filter 63, the vacuum separator 31 and the heater 21 of this embodiment are all of component type structure, connected by hydraulic joint type pipeline, and the assembly quality of the supporting steel frame is intact and the connection is not loose. The component type structure is connected with the traditional pipeline by hard welding, and the advantage is that the components can be directly replaced and can be mass-produced on the assembly line.

[0036] Optionally, the main pipelines and tank body of this embodiment are processed by pickling, phosphating, passivation and electrophoresis, the frame and accessories are processed by plastic spraying, and the whole machine is connected by stainless steel bolts.

[0037] The bipolar vacuum oil filter of this embodiment is also provided with an electrical control cabinet, which is used to realize the automatic operation of the vacuum pump 55, the oil discharge pump 33, the heater 21, the vacuum separator 31, and various valves according to the preset state, and can realize automatic control or shutdown protection and alarm in the case of overheating, overload, overcurrent, overvoltage and sudden accidents, and completely realize the separation of man and machine operation. The electrical control cabinet adopts 12 intelligent control technologies, including: automatic identification control technology of oil flow, automatic identification control technology of vacuum degree, automatic identification technology of filter element contamination degree, voltage phase sequence identification technology, system self-check control technology, heating system PID temperature control technology PID control: that is, proportional-integral-differential control, automatic control technology of working state identification prompt, operation safety interlock protection control technology and fault sound and light alarm prompt safety protection control, which can realize safe operation, separation of man and machine, and complete free-duty function, so the bipolar vacuum oil filter can also be called "artificial intelligence oil filter robot". The height and position of the electrical control cabinet are strictly designed according to ergonomics. It is so strict that the position, color and placement of each button and indicator light are determined according to the workers' operating habits and line of sight. Electrical operation is easier and the instructions are clearer and more reasonable.

[0038] All basic parts of the bipolar vacuum oil filter are phosphated and electrophoretically treated, and the base is designed with a lifting ring, which is more convenient for loading and unloading; the base is made of rectangular tubes, and the four sides are welded to make the base more solid, replacing the angle steel and channel steel used by other manufacturers; it can also be connected in parallel with the oil tank and oil station of the user's oil system, and realize online circulation oil filtration without affecting the normal production work of the user. Through circulation filtration, the pollution degree of the oil is gradually reduced until it is qualified, and the heater 21 can be started without or in an energy-saving way, which is better than the traditional oil filter that must start the heater 21 to achieve the oil filtration effect. The bipolar vacuum oil filter can also be used offline, and the bipolar vacuum oil filter can be moved to the place where the dirty oil is stored, or when the user shuts down the oil system for maintenance, the bipolar vacuum oil filter is started to circulate and filter the dirty oil until the oil is qualified. During offline filtration, the low-power heater 21 can achieve the most efficient filtration effect, which is more energy-saving and safer than the traditional oil filter.

[0039] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A two-stage vacuum oil filter, characterized in that: include: A primary filter device (10), the primary filter device (10) being connected to the first oil inlet via a pipeline and a first conversion valve (80) being arranged on the pipeline; A heating device (20), wherein the oil inlet side of the heating device (20) is connected to the oil outlet side of the primary filter device (10) via a pipeline; A separation device (30), wherein the oil inlet side of the separation device (30) is connected to the oil outlet side of the heating device (20) via a pipeline; An oil level monitoring device (40), wherein the oil level monitoring device (40) is arranged on the separation device (30); A condensing device (50), wherein the condensing device (50) is connected to the separating device (30) via a pipeline; A fine filter device (60), wherein the oil inlet side of the fine filter device (60) is connected to the oil outlet side of the separation device (30) via a pipeline, the oil outlet side of the fine filter device (60) is connected to the oil injection port via a pipeline, and an oil injection valve (61) is provided on the pipeline; the oil outlet side of the fine filter device (60) is also connected to the second oil inlet via a pipeline, and a second conversion valve (90) is provided on the pipeline; A circulation device (70), wherein the oil inlet side of the circulation device (70) is connected to the oil outlet side of the separation device (30) via a pipeline and a circulation valve (71) is provided on the pipeline, and the oil outlet side of the circulation device (70) is connected to the oil inlet side of the heating device (20) via a pipeline; The second oil inlet is also connected to the oil inlet side of the heating device (20) through a pipeline and is provided with a third conversion valve (100); the first oil inlet is also connected to the oil outlet side of the fine filter device (60) through a pipeline and is provided with a fourth conversion valve (110).

2. The double-stage vacuum oil filter according to claim 1, characterized in that: A temperature tester (120) is provided at the connecting pipes of the first oil inlet and the second oil inlet.

3. The double-stage vacuum oil filter according to claim 1, characterized in that: The primary filtration device (10) comprises: a primary filter (11), wherein the oil inlet side of the primary filter (11) is in communication with both the first oil inlet and the second oil inlet, and the oil outlet side of the primary filter (11) is in communication with the heating device (20); A first sewage discharge valve (12), wherein the first sewage discharge valve (12) is arranged at the bottom of the primary filter (11).

4. The double-stage vacuum oil filter according to claim 1, characterized in that: The heating device (20) comprises: a heater (21), wherein the oil inlet side of the heater (21) is in communication with the oil outlet side of the primary filter device (10), and the oil outlet side of the heater (21) is in communication with the oil outlet side of the separation device (30); a first oil drain valve (22), the first oil drain valve (22) being arranged at the bottom of the heater (21); a high temperature protection device (23), the high temperature protection device (23) being arranged on the heater (21) to monitor the temperature of the heater (21); A constant temperature controller (24), the constant temperature controller (24) is connected to both the heater (21) and the high temperature protection device (23) to control the heater (21).

5. The double-stage vacuum oil filter according to claim 1, characterized in that: The separation device (30) comprises: A vacuum separator (31), wherein the oil inlet side of the vacuum separator (31) is connected to the oil outlet side of the heating device (20) via a pipeline and an oil supply solenoid valve (311) is provided on the pipeline; a second oil drain valve (32), the second oil drain valve (32) being arranged at the bottom of the vacuum separator (31); an oil discharge pump (33), wherein the oil inlet side of the oil discharge pump (33) is connected to the oil outlet side of the vacuum separator (31) via a pipeline and a check valve is provided on the pipeline; the oil outlet side of the oil discharge pump (33) is connected to both the oil inlet side of the fine filter device (60) and the oil inlet side of the circulation device (70); Wherein, the oil supply solenoid valve (311) between the vacuum separator (31) and the heating device (20) is also connected in parallel with a bypass valve (34).

6. The double-stage vacuum oil filter according to claim 5, characterized in that: The oil level monitoring device (40) comprises: a foam sensor (41), the foam sensor (41) being arranged at a preset position on the inner wall of the vacuum separator (31); An oil level controller (42) is connected to both the foam sensor (41) and the second oil drain valve (32) to control the second oil drain valve (32).

7. The double-stage vacuum oil filter according to claim 1, characterized in that: The condensing device (50) comprises: Condensers (51), there are two condensers (51), both of the two condensers (51) are connected to the separation device (30) through pipelines and are provided with reflux valves (511); a pipeline connecting one of the condensers (51) and the separation device (30) is provided with an aeration solenoid valve (512), and the other condenser is provided with a single air extraction valve (513); A Roots vacuum pump (52), wherein the Roots vacuum pump (52) and the plurality of condensers (51) are connected via a pipeline and a vacuum exhaust valve (521), a vacuum gauge (522) and a vacuum pressure sensor (523) are provided on the pipeline; Coolers (53), there are two coolers (53), the two coolers (53) are connected to each other through a pipeline; one of the condensers (51) is connected to the Roots vacuum pump (52) through a pipeline; A water reservoir (54), the water reservoir (54) and the two coolers (53) are connected via pipelines and a cut-off valve (541) is provided on the pipelines; the water reservoir (54) is provided with an aeration valve (542), a second sewage valve (543) and a liquid level display screen (544); A vacuum pump (55), wherein the vacuum pump (55) is connected to the other condenser (51) via a pipeline and a liquid level compensator (551) is arranged on the pipeline.

8. The double-stage vacuum oil filter according to claim 1, characterized in that: The fine filtering device (60) comprises: a secondary filter (62), wherein the oil inlet side of the secondary filter (62) is in communication with the separation device (30); a third drain valve (621) is provided at the bottom of the secondary filter (62); A fine filter (63), wherein the oil inlet side of the fine filter (63) is connected to the secondary filter (62) through a pipeline and a first pressure gauge (64) is provided on the pipeline; the oil outlet side of the fine filter (63) is connected to the oil filling port through a pipeline and a sampling valve (65) and an oil filling valve (61) are provided; and a fourth drain valve (631) is provided at the bottom of the fine filter (63).

9. The double-stage vacuum oil filter according to claim 1, characterized in that: The circulation device (70) comprises: a safety valve (72), wherein the oil inlet side of the safety valve (72) is in communication with the oil outlet side of the separation device (30); a second pressure gauge (73), wherein the oil inlet side of the second pressure gauge (73) is connected to the oil outlet side of the safety valve (72); a circulation valve (71), wherein an oil inlet side of the circulation valve (71) is in communication with an oil outlet side of the second pressure gauge (73); A pressure controller (74), wherein the pressure controller (74) is connected to both the second pressure gauge (73) and the circulation valve (71) to control the circulation valve (71).

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