Negative pressure ultrafiltration membrane filtering device and use method thereof

Abstract

The present invention discloses a negative pressure ultrafiltration membrane filtering device, comprising an equipment mounting frame, an oil inlet main pipe, an oil outlet main pipe, a primary filter tank, a first oil pump, a heating tank, an oil storage tank, an ultrafiltration membrane filtering box device, a vacuum tank assembly, and a second oil pump, which are connected in sequence by pipelines and are all fixedly mounted on the equipment mounting frame, the primary filter tank is connected to the oil inlet main pipe, the output end of the second oil pump is connected to the oil outlet main pipe, and a control box is also fixedly mounted on the equipment mounting frame. The equipment of the present invention utilizes vacuum negative pressure to reversely absorb and filter oil, thereby solving the problem that impurity particles in the oil are easily accumulated on the filter material, causing the filter element to be scrapped, and high-precision ultrafiltration membrane filter materials can be applied to the filtering of various industrial lubricating oils, thereby overcoming the limitation of the existing filtering technology that the filtering precision cannot be further improved, improving the cleanliness of the oil after filtration, ensuring the lubrication performance and service life of various equipment, and achieving the purpose of reducing the consumption and increasing the efficiency of the filter material.

Description

Technical Field

[0001] The invention relates to the technical field of oil filter equipment manufacturing, and in particular to a negative pressure ultrafiltration membrane filtering device and a use method thereof. Background Art

[0002] At present, the known regeneration treatment of various industrial lubricants such as gear oil, hydraulic oil, insulating oil, turbine oil and other oil products often adopts pipeline filtration, box filter press, aggregation separation, centrifugal filtration and other methods. Their common feature is that they all adopt positive pressure filtration of oil pump, and the selected filter material accuracy is generally not more than 3 microns. The reason is that the higher the filter material accuracy, the greater the oil flow resistance and the lower the filtration efficiency. Due to the positive pressure output of the oil pump, particulate impurities in the flowing oil that are larger than the filter material accuracy will quickly gather and block the filter material. In addition, due to the high accuracy of the filter material, the particles blocked inside the filter material are extremely difficult to clean, and the filter material can only be scrapped, resulting in the industry common problem that the higher the filter material accuracy, the faster the filter material consumption and the higher the use cost.

[0003] At the same time, due to the limitation of filter material precision, the filter materials widely used at present cannot filter out oxidized colloids and other impurities suspended in the oil with a particle diameter of less than 3 microns. Therefore, it is impossible to further improve the cleanliness of the oil after filtration, which in turn affects the lubrication performance and service life of various equipment. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a negative pressure ultrafiltration membrane filtering device and a method for using the same.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A negative pressure ultrafiltration membrane filtering device comprises an equipment mounting frame, a primary filter tank, a first oil pump, a heating tank, an oil storage tank, an ultrafiltration membrane filtering box device, a vacuum tank assembly, a second oil pump, an oil inlet main pipe, and an oil outlet main pipe. The primary filter tank, the first oil pump, the heating tank, the oil storage tank, the ultrafiltration membrane filtering box device, the vacuum tank assembly, and the second oil pump are sequentially connected by pipelines and are all fixedly mounted on the equipment mounting frame. The primary filter tank is connected to the oil inlet main pipe, and the output end of the second oil pump is connected to the oil outlet main pipe. A control box is also fixedly mounted on the equipment mounting frame.

[0007] A plurality of walking wheels are installed at the bottom of the equipment mounting frame.

[0008] A filter bag is installed in the primary filter tank, a primary filter tank oil inlet pipe is provided at the upper end of the primary filter tank, the primary filter tank oil inlet pipe is connected to the oil inlet main pipeline, a primary filter tank oil inlet solenoid valve is installed on the connecting pipeline between the primary filter tank oil inlet pipe and the oil inlet main pipeline, a primary filter tank oil outlet is provided at the bottom of the primary filter tank, a primary filter tank vent valve is installed on the top of the primary filter tank, the primary filter tank oil outlet is connected to the first oil pump input end pipeline, a heating rod is installed in the heating tank, a heating tank oil inlet pipe is provided at the bottom of the heating tank, the heating tank oil inlet pipe is connected to the first oil pump output end pipeline, the heating A heating tank oil outlet pipe is provided on the top of the tank, an oil tank oil inlet pipe is provided on the upper end of the oil storage tank, the oil tank oil inlet pipe is connected to the heating tank oil outlet pipe, an oil tank oil outlet pipe is provided at the bottom of the oil storage tank, the oil tank oil outlet pipe is connected to the ultrafiltration membrane filter box device pipeline, an air venting elbow is provided on the top of the oil storage tank, a first window is installed on the side wall of the oil storage tank for observing the state of the oil in the oil storage tank, a first liquid level tube is installed on the side wall of the oil storage tank for observing the liquid level height of the oil storage tank, and a first float liquid level controller is installed on the oil storage tank for controlling the oil level height of the oil storage tank.

[0009] The ultrafiltration membrane filter box device comprises a filter box, a filter element assembly, a filter element pressure cover, and a filter element locking cover assembly. The top of the filter box is provided with a box top air outlet pipe, the lower end of the filter box side wall is provided with a box bottom air outlet pipe, the top of the oil storage tank is connected to two air inlet elbows, and the two air inlet elbows are respectively connected to the box top air outlet pipe and the box bottom air outlet pipe pipeline. The highest height of the filter box is lower than the lowest oil level control height of the first float liquid level controller. A plurality of filter element installation platforms are evenly arranged on the upper end surface of the filter box, the filter element assembly is inserted through the filter element installation platform, and the filter element pressure cover is pressed tightly on the filter element. The filter element locking cover assembly is connected to the filter element mounting platform through a filter element locking cover assembly, the upper end of the filter box is connected with an oil receiving ring groove along the outer side wall, the oil receiving ring groove is connected with a waste oil output pipe, a waste oil output valve is installed on the waste oil output pipe, the side wall of the filter box is connected with a filter box oil inlet pipe, the filter box oil inlet pipe is connected to the oil storage tank oil outlet pipe, the bottom of the filter box is provided with a filter box oil return pipe, the primary filter tank oil inlet pipe is connected with a primary filter tank oil return pipe port, the filter box oil return pipe is connected to the primary filter tank return pipe port, and the primary filter tank oil return pipe port is arranged after the primary filter tank oil inlet solenoid valve.

[0010] The filter element assembly comprises a filter material fixing flange plate and a filter element filter material. The filter element filter material is fixedly mounted on the filter material fixing flange plate. A filter element oil outlet hole is penetrated on the filter material fixing flange plate. Sealing rings are respectively mounted on the upper and lower end surfaces of the filter material fixing flange plate. A tee pipe is connected to the top of the filter element gland. The lower end of the tee pipe is connected to the filter element gland. The left and right ends of the tee pipe are respectively set as the filter box oil outlet pipe port and the filter element recoil air inlet pipe port. The filter box oil outlet pipe port is mounted with a filter element oil outlet solenoid valve. A recoil air intake electric valve is installed on the recoil air intake pipe port of the filter element. The filter element locking cover assembly includes an upper locking seat, a lower locking seat, and a locking screw. Several of the upper locking seats are fixedly connected to the side edge of the filter element pressure cover, and several of the lower locking seats are fixedly connected to the side wall of the filter element mounting platform. Several of the upper locking seats and the lower locking seats are arranged in a one-to-one correspondence. The upper locking seat is provided with a screw movement groove, and a rotating pin is rotatably inserted on the lower locking seat. The locking screw is vertically welded to the rotating pin, and a lifting eye nut is threadedly installed on the locking screw.

[0011] The vacuum tank assembly comprises a vacuum tank, a vacuum oil inlet box, and a vacuum pump. The vacuum oil inlet box is connected to the vacuum tank pipeline. The filter box oil outlet pipe of the three-way pipe on the top of the filter element gland is connected to the vacuum oil inlet box. A vacuum pressure gauge is installed on the vacuum oil inlet box. A vacuum tank air extraction port is provided on the top of the vacuum tank. The vacuum tank air extraction port is connected to the vacuum pump pipeline. The vacuum pump is connected to a cooling water tank for circulating cooling of the vacuum pump. An air filter is installed on the pipeline connecting the vacuum tank air extraction port and the vacuum pump. A second float liquid level controller is installed on the vacuum tank for controlling the oil level in the vacuum tank. A vacuum tank air inlet pipe is also connected to the top of the vacuum tank. A vacuum tank air inlet solenoid valve is installed on the vacuum tank air inlet pipe. A vacuum tank oil outlet is provided at the bottom of the vacuum tank. The vacuum tank oil outlet is connected to the second oil pump input end pipeline. A second window is installed on the side wall of the vacuum tank for observing the oil state in the vacuum tank. A second liquid level tube is installed on the side wall of the vacuum tank for observing the liquid level of the vacuum tank.

[0012] The first oil delivery pump, the second oil delivery pump, the primary filter tank oil inlet solenoid valve, the first float liquid level controller, the second float liquid level controller, the vacuum tank air inlet solenoid valve, the recoil air inlet electrical valve, and the filter element oil outlet solenoid valve are all connected to the control box. The control box is provided with an oil temperature control area and a plurality of control buttons.

[0013] A method for using a negative pressure ultrafiltration membrane filtration device comprises the following steps:

[0014] 1) Start the equipment, open the solenoid valve of the primary filter tank, start the first oil pump, and the oil is sucked from the oil inlet main pipe into the primary filter tank first, and the large particles of impurities are filtered out by the filter bag;

[0015] 2) Set the oil temperature in the oil temperature control area of ​​the control box to 40 degrees, and use the first oil pump to transport the pre-filtered oil to the heating tank, and heat the oil through the heating rod in the heating tank;

[0016] 3) The heated oil flows into the oil storage tank. Since the oil storage tank is connected to the filter box of the ultrafiltration membrane filter box device, the oil levels of the oil storage tank and the filter box rise synchronously. There is an oil return pipeline at the bottom of the filter box. The oil flows back to the primary filter tank through the oil return pipeline at the same time, and goes through steps 1) and 2) again, and the cycle continues until the flowing oil temperature rises to 40 degrees.

[0017] 4) The vacuum pump is started to evacuate the vacuum tank. Affected by the pressure difference, the oil in the filter box is filtered by the filter element assembly and then output from the filter element oil outlet solenoid valve end of the three-way pipe on the top of the filter element gland to the vacuum oil inlet tank and finally flows into the vacuum tank. The impurities filtered out by the filter element assembly remain in the filter box and on the surface of the filter element assembly;

[0018] 5) The oil level in the vacuum tank rises. When the oil level rises to the oil level control position of the second float liquid level controller, the second oil pump starts and the filtered oil is discharged from the oil outlet main pipe;

[0019] 6) The filter element backwash air inlet port of the three-way pipe on the top of the filter element gland is connected to an external air source. After a period of filtering operation, the filter element oil outlet solenoid valve of the three-way pipe on the top of the filter element gland is closed, and the backwash air inlet electric valve is opened. The backwash air enters from the filter element backwash air inlet port, and impacts the filter element assembly in the reverse direction to blow away the solid particle impurities adsorbed on the surface of the filter element filter material to ensure the filtering effect of the filter element filter material. After the backwash operation, the backwash air inlet electric valve is closed, and the filter element oil outlet solenoid valve is opened to filter the liquid again;

[0020] 7) Repeat the above steps 1) to 6) to continuously circulate and filter the oil.

[0021] The beneficial effects of the present invention are as follows: the equipment of the present invention utilizes vacuum negative pressure to reversely absorb and filter oil, thereby solving the problem that impurity particles in the oil are easily accumulated on the filter material, causing the filter element to be scrapped. High-precision ultrafiltration membrane filter materials can be applied to the filtration of various industrial lubricating oils, overcoming the limitation of existing filtration technology that the filtration accuracy cannot be further improved, improving the cleanliness of the oil after filtration, ensuring the lubrication performance and service life of various equipment, and at the same time achieving the purpose of reducing consumption and increasing efficiency of the filter material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention;

[0023] Figure 2 is a side view of the present invention;

[0024] Figure 3It is a schematic diagram of the connection of various components of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection structure of the primary filter tank of the present invention;

[0026] Figure 5 It is a schematic diagram of the connection structure of the heating tank of the present invention;

[0027] Figure 6 It is a schematic diagram of the oil storage tank connection structure of the present invention;

[0028] Figure 7 It is a schematic diagram of the connection structure of the vacuum tank assembly of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the ultrafiltration membrane filter box device of the present invention;

[0030] Fig. 9 for Figure 8 A magnified view of the position in FIG.

[0031] Fig.10 This is a structural diagram of the filter element assembly installation of the present invention;

[0032] Fig.11 It is a three-dimensional structural diagram of the filter element assembly of the present invention;

[0033] Fig.12 It is a schematic structural diagram of the filter element locking cover assembly of the present invention.

[0034] In the figure: equipment mounting frame 1, walking wheel 101, primary filter tank 2, filter bag 21, primary filter tank oil inlet pipe 22, primary filter tank oil inlet solenoid valve 23, primary filter tank oil outlet 24, primary filter tank vent valve 25, primary filter tank oil return pipe 26, first oil pump 3, heating tank 4, heating rod 41, heating tank oil inlet pipe 42, heating tank oil outlet pipe 43, oil storage tank 5, oil storage tank oil inlet pipe 51, oil storage tank oil outlet pipe 52, air release elbow 53, air intake elbow 54, first viewing Window 55, first liquid level tube 56, first float liquid level controller 57, ultrafiltration membrane filter box device 6, filter box body 61, box top air outlet pipe 611, box bottom air outlet pipe 612, filter element installation platform 62, filter element assembly 63, filter material fixing flange plate 631, filter element oil outlet hole 6311, filter element filter material 632, sealing ring 633, filter element gland 64, three-way pipe 641, filter box oil outlet pipe port 642, filter element backwash air inlet port 643, filter element outlet Oil solenoid valve 644, recoil air intake electric valve 645, filter element lock cover assembly 65, upper lock seat 651, screw movement groove 6511, lower lock seat 652, rotating pin 653, locking screw 654, lifting ring nut 655, oil ring groove 66, waste oil output pipe 661, waste oil output valve 662, filter box oil inlet pipe 67, filter box oil inlet valve 671, filter box oil return pipe 68, filter box oil return valve 681, vacuum tank assembly 7, vacuum tank 71 , vacuum tank air outlet 711, vacuum tank oil outlet 712, second window 713, second liquid level tube 714, vacuum oil inlet box 72, vacuum pressure gauge 721, vacuum pump 73, cooling water tank 74, air filter 75, second float liquid level controller 76, vacuum tank air inlet pipe 77, vacuum tank air inlet solenoid valve 771, second oil delivery pump 8, oil inlet main pipe 9, oil outlet main pipe 10, control box 11, oil temperature control area 111, operation button 112. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. The descriptions of "left" and "right" in the present invention are all based on Figure 3 For reference direction:

[0036] like Figures 1 to 12 As shown, a negative pressure ultrafiltration membrane filtering device includes an equipment mounting frame 1, a primary filter tank 2, a first oil pump 3, a heating tank 4, an oil storage tank 5, an ultrafiltration membrane filtering box device 6, a vacuum tank assembly 7, a second oil pump 8, an oil inlet main pipe 9, and an oil outlet main pipe 10. The primary filter tank 2, the first oil pump 3, the heating tank 4, the oil storage tank 5, the ultrafiltration membrane filtering box device 6, the vacuum tank assembly 7, and the second oil pump 8 are connected in sequence by pipelines and are fixedly installed on the equipment mounting frame 1. The primary filter tank 2 is connected to the oil inlet main pipe 9 by pipeline, and the output end of the second oil pump 8 is connected to the oil outlet main pipe 10 by pipeline. A control box 11 is also fixedly installed on the equipment mounting frame 1.

[0037] A plurality of running wheels 101 are installed at the bottom of the equipment mounting frame 1, so that the whole equipment can be easily moved and can be moved to the vicinity of the location where the oil to be filtered is located to directly perform filtering operations.

[0038] A filter bag 21 is installed in the primary filter tank 2, and the filter bag 21 can filter out large particles of solid impurities in the oil. A primary filter tank oil inlet pipe 22 is provided at the upper end of the primary filter tank 2, and the primary filter tank oil inlet pipe 22 is connected to the oil inlet main pipe 9. The oil entering the oil inlet main pipe 9 is first filtered through the primary filter tank 2. A primary filter tank oil inlet solenoid valve 23 is installed on the connecting pipeline between the primary filter tank oil inlet pipe 22 and the oil inlet main pipe 9. The primary filter tank oil inlet solenoid valve 23 can automatically control the opening and closing of the oil inlet pipeline. A primary filter tank oil outlet 24 is provided at the bottom of the primary filter tank 2, and a primary filter tank passage 24 is installed on the top of the primary filter tank 2. The air valve 25, the ventilation valve 25 of the primary filter tank is in a normally closed state, and is opened when the filter bag 21 needs to be replaced to prevent the top cover of the primary filter tank 2 from being sucked by the internal and external pressure difference, resulting in the inability to open and replace the filter bag 21. The oil outlet 24 of the primary filter tank is connected to the input end pipeline of the first oil pump 3. A heating rod 41 is installed in the heating tank 4. A heating tank oil inlet pipe 42 is provided at the bottom of the heating tank 4. The heating tank oil inlet pipe 42 is connected to the output end pipeline of the first oil pump 3. A heating tank oil outlet pipe 43 is provided at the top of the heating tank 4. The oil sucked from the first oil pump 3 enters the heating tank 4. The heating tank 4 adopts a bottom inlet. The upper structure is designed, and the heating rod 41 is immersed in the oil to prevent the heating tank 4 from being damaged by dry burning. An oil tank inlet pipe 51 is provided at the upper end of the oil tank 5, and the oil tank inlet pipe 51 is connected to the heating tank outlet pipe 43. The heated oil flows into the oil tank 5. An oil tank outlet pipe 52 is provided at the bottom of the oil tank 5, and the oil tank outlet pipe 52 is connected to the ultrafiltration membrane filter box device 6. A venting elbow 53 is provided on the top of the oil tank 5 for venting air. A first viewing window 55 is installed on the side wall of the oil tank 5 for observing the state of the oil in the oil tank 5. A first liquid level tube 56 is installed on the side wall for observing the liquid level height of the oil storage tank 5. A first float liquid level controller 57 is installed on the oil storage tank 5 for controlling the oil level height of the oil storage tank 5. The first float liquid level controller 57 is interlocked with the first oil pump 3 circuit. When the liquid level of the oil storage tank 5 is lower than the oil level position controlled by the first float liquid level controller 57, the first oil pump 3 is continuously started to replenish oil. When the liquid level of the oil storage tank 5 rises to the oil level position controlled by the first float liquid level controller 57, the first oil pump 3 stops working to prevent the oil level of the oil storage tank 5 from overflowing due to excessive height.

[0039] The ultrafiltration membrane filter box device 6 includes a filter box body 61, a filter element assembly 63, a filter element pressure cover 64, and a filter element locking cover assembly 65. A top air outlet pipe 611 is provided on the top of the filter box body 61, and a bottom air outlet pipe 612 is provided on the lower end of the side wall of the filter box body 61. Two air inlet elbows 54 are connected to the top of the oil storage tank 5. The two air inlet elbows 54 are respectively connected to the top air outlet pipe 611 and the bottom air outlet pipe 612. The filter box body 61 and the oil storage tank 5 produce a communicating vessel effect. The highest height of the filter box body 61 is lower than the lowest oil level control height of the first float liquid level controller 57. The filter box body 61 ensures that the oil is full. The top air outlet pipe 611 and the bottom air outlet pipe 612 filter The air in the oil in the box 61 is introduced into the oil storage tank 5 and discharged through the air release elbow 53 to ensure that there are no bubbles in the oil in the filter box 61, thereby improving the filtering effect. A number of filter element mounting platforms 62 are evenly distributed on the upper end surface of the filter box 61. The filter element assembly 63 is inserted through the filter element mounting platform 62. The filter element pressure cover 64 is pressed tightly on the filter element assembly 63 and is locked and connected with the filter element mounting platform 62 through the filter element locking cover assembly 65. The filter element assembly 63 is different from the traditional built-in installation and adopts an external pressing and sealing installation structure design. In this way, the replacement and cleaning of the filter element assembly 63 will be very convenient. The upper end of the filter box 61 is connected along the outer wall with The oil receiving ring groove 66 is connected to a waste oil output pipe 661, and a waste oil output valve 662 is installed on the waste oil output pipe 661. During the removal of the filter element assembly 63, the residual oil on the filter element assembly 63 will drip onto the filter box 61. If it is allowed to flow, the surface of the filter box 61 will be greasy and will also pollute the floor of the workplace, causing personnel to slip and cause accidents. The oil receiving ring groove 66 can block and collect the dripping oil and discharge it as needed through the waste oil output pipe 661. A filter box oil inlet pipe 67 is connected to the side wall of the filter box 61. The filter box oil inlet pipe 67 is connected to the oil storage tank oil outlet pipe 52. A filter box oil return pipe is provided at the bottom of the filter box 61 68. A filter box oil inlet valve 671 is installed on the filter box oil inlet pipe 67, a filter box oil return valve 681 is installed on the filter box oil return pipe 68, a primary filter tank oil inlet pipe 22 is connected to a primary filter tank oil return pipe port 26, the filter box oil return pipe 68 is connected to the primary filter tank oil return pipe port 26, the primary filter tank oil return pipe port 26 is arranged after the primary filter tank oil inlet solenoid valve 23, and an oil return pipe connected to the primary filter tank 2 is provided at the bottom of the filter box body 61. While the oil is filtered, excess oil is refluxed and circulated for heating to ensure the oil temperature. The design of the primary filter tank oil return pipe port 26 being arranged after the primary filter tank oil inlet solenoid valve 23 makes the return oil pipe not controlled by the primary filter tank oil inlet solenoid valve 23, and can continuously return oil.

[0040] The filter element assembly 63 includes a filter material fixing flange plate 631 and a filter element filter material 632. The filter element filter material 632 is fixedly mounted on the filter material fixing flange plate 631. The filter element filter material 632 is made of ultrafiltration membrane material and has high filtering accuracy. A filter element oil outlet hole 6311 is penetrated through the filter material fixing flange plate 631. Sealing rings 633 are respectively installed on the upper and lower end surfaces of the filter material fixing flange plate 631. The filter element assembly 63 is clamped and sealed between the filter element gland 64 and the filter element mounting platform 62 by the filter material fixing flange plate 631. The sealing rings 633 at both end surfaces play a role in sealing the contact surface between the filter element pressure cover 64 and the filter element mounting platform 62. The top of the filter element pressure cover 64 is connected to a three-way pipe 641, and the lower end of the three-way pipe 641 is connected to the filter element pressure cover 64. The left and right ends of the three-way pipe 641 are respectively set as the filter box oil outlet pipe port 642 and the filter element backwash air inlet pipe port 643. The filter box oil outlet pipe port 642 is installed with a filter element oil outlet solenoid valve 644, and the filter element backwash air inlet pipe port 643 is installed with a backwash air inlet electric valve 645. The filter box oil outlet pipe port 642 is installed with a filter element oil outlet solenoid valve 644, and the filter element backwash air inlet pipe port 643 is installed with a backwash air inlet electric valve 645. 42 is used to discharge oil to the vacuum oil inlet box 72, the filter element backwash air inlet port 643 is connected to an external air source, and is used for air intake backwashing to clean the filter element assembly 63. The filter element locking cover assembly 65 includes an upper locking seat 651, a lower locking seat 652, and a locking screw 654. A plurality of upper locking seats 651 are fixedly connected to the side edge of the filter element pressure cover 64, and a plurality of lower locking seats 652 are fixedly connected to the side wall of the filter element mounting platform 62. A plurality of upper locking seats 651 and lower locking seats 652 are arranged one by one, and a screw movement groove 6511 is provided on the upper locking seat 651, and a lower locking screw 654 is provided on the lower locking seat 652. A rotating pin 653 is rotatably inserted on the seat 652, and a locking screw 654 is vertically welded to the rotating pin 653. A lifting eye nut 655 is threadedly installed on the locking screw 654. When locking is required, the locking screw 654 is rotated to the screw movement groove 6511, and the lifting eye nut 655 is screwed to lock it. When opening is required, the lifting eye nut 655 is loosened, and the locking screw 654 is rotated in the opposite direction to disengage from the locking seat 651, and the filter element pressure cover 64 can be unlocked, so that the filter element assembly 63 can be quickly disassembled for replacement or cleaning.

[0041] The vacuum tank assembly 7 includes a vacuum tank 71, a vacuum oil inlet box 72, and a vacuum pump 73. The vacuum oil inlet box 72 is connected to the vacuum tank 71 by a pipeline. The filter box oil outlet pipe 642 of the three-way pipe 641 on the top of the filter element gland 64 is connected to the vacuum oil inlet box 72. A vacuum pressure gauge 721 is installed on the vacuum oil inlet box 72. The vacuum oil inlet box 72 is connected to the vacuum tank 71 to increase the vacuum volume. The oil in the filter box 61 passes through the vacuum oil inlet box 72 and then enters the vacuum tank 71. A vacuum tank exhaust port 711 is provided on the top of the vacuum tank 71. The air extraction port 711 is connected to the pipeline of the vacuum pump 73. The vacuum pump 73 is connected to a cooling water tank 74 for circulating cooling of the vacuum pump 73 to prevent the vacuum pump 73 from being damaged by overheating. An air filter 75 is installed on the pipeline connecting the vacuum tank air extraction port 711 and the vacuum pump 73. The air filter 75 filters out moisture from the air to prevent water-containing air from entering the vacuum pump 73 and causing damage to the vacuum pump 73. A second float liquid level controller 76 is installed on the vacuum tank 71 to control the oil level in the vacuum tank 71. A vacuum tank air inlet pipe 77 is also connected to the top of the vacuum tank 71. A vacuum tank air intake solenoid valve 771 is installed on the empty tank air intake pipe 77. The vacuum tank air intake solenoid valve 771 is interlocked with the second float liquid level controller 76 and the second oil pump 8 circuit. When the oil level in the vacuum tank 71 rises to the liquid level control position of the second float liquid level controller 76, the second oil pump 8 is started. At this time, the vacuum tank air intake solenoid valve 771 is opened, and air enters the vacuum tank 71 to release the vacuum state of the vacuum tank 71. The second oil pump 8 outputs the filtered oil. The oil level in the vacuum tank 71 continues to drop during this process until it drops to a level that is out of the second float liquid level controller 76. When the float liquid level controller 76 is in the liquid level control position, the second oil pump 8 stops working, the vacuum tank air inlet solenoid valve 771 is closed, and the vacuum pump 73 starts again to evacuate and suck oil again, so as to complete the oil absorption and output in this cycle. A vacuum tank oil outlet 712 is provided at the bottom of the vacuum tank 71, and the vacuum tank oil outlet 712 is connected to the input end pipeline of the second oil pump 8. A second window 713 is installed on the side wall of the vacuum tank 71 for observing the oil state in the vacuum tank 71, and a second liquid level tube 714 is installed on the side wall of the vacuum tank 71 for observing the liquid level height of the vacuum tank 71.

[0042] The first oil pump 3, the second oil pump 8, the primary filter tank oil inlet solenoid valve 23, the first float liquid level controller 57, the second float liquid level controller 76, the vacuum tank air inlet solenoid valve 771, the recoil air inlet electrical valve 645, and the filter element oil outlet solenoid valve 644 are all connected to the control box 11. The control box 11 is provided with an oil temperature control area 111, which can be used to set the temperature of the oil flowing in the control device. The optimal oil temperature is 40 degrees. At this temperature, the oil has the best fluidity and is most conducive to filtering operations. The control box 11 is provided with a number of control buttons 112 for controlling the start and stop of each electrical equipment.

[0043] A method for using a negative pressure ultrafiltration membrane filtration device comprises the following steps:

[0044] 1) Start the equipment, open the primary filter tank oil inlet solenoid valve 23, start the first oil pump 3, and the oil is sucked from the oil inlet main pipe 9 and first enters the primary filter tank 2, where large particles of impurities are filtered out by the filter bag 21;

[0045] 2) Set the oil temperature of the oil temperature control area 111 of the control box 11 to 40 degrees, and deliver the pre-filtered oil to the heating tank 4 through the first oil pump 3. The oil is heated by the heating rod 41 in the heating tank 4. The oil at 40 degrees has the best fluidity and the best filtering effect.

[0046] 3) The heated oil flows into the oil storage tank 5. Since the oil storage tank 5 is connected to the filter box 61 of the ultrafiltration membrane filter box device 6, the oil levels of the oil storage tank 5 and the filter box 61 rise synchronously. A return oil pipeline is provided at the bottom of the filter box 61. The oil flows back to the primary filter tank 2 through the return oil pipeline at the same time, and goes through steps 1) and 2) again, and the cycle is repeated until the flowing oil temperature rises to 40 degrees. While the oil inlet main pipe 9 continuously feeds oil, the oil is continuously circulated and heated in the primary filter tank 2, the heating tank 4, the oil storage tank 5, and the filter box 61 to ensure that the oil temperature rises to 40 degrees and the oil level continues to rise;

[0047] 4) When the oil temperature reaches 40 degrees, the vacuum pump 73 is started to evacuate the vacuum tank 71. Affected by the pressure difference, the oil in the filter box 61 is filtered by the filter element assembly 63 and then output from the filter element oil outlet solenoid valve 644 end of the three-way pipe 641 at the top of the filter element gland 64 to the vacuum oil inlet box 72 and finally flows into the vacuum tank 71. The impurities filtered out by the filter element assembly 63 remain in the filter box 61 and on the surface of the filter element assembly 63. The above action realizes the reverse filtration of negative pressure;

[0048] 5) The oil level in the vacuum tank 71 rises. When the oil level rises to the oil level control position of the second float liquid level controller 76, the second oil delivery pump 8 is started, and the filtered oil is output from the oil outlet main pipe 10;

[0049] 6) The filter element backwash air inlet port 643 of the three-way pipe 641 at the top of the filter element gland 64 is connected to an external air source. After a period of filtering operation, the adsorbed impurities on the surface of the filter element assembly 63 increase and the filtering effect becomes worse. The filter element oil outlet solenoid valve 644 of the three-way pipe 641 at the top of the filter element gland 64 is closed, and the backwash air inlet electric valve 645 is opened. The backwash air enters from the filter element backwash air inlet port 643 and impacts the filter element assembly 63 from the inside to the outside, and the solid particle impurities adsorbed on the surface of the filter element filter material 632 are blown off to ensure the filtering effect of the filter element filter material 632. After the backwash operation, the backwash air inlet electric valve 645 is closed, and the filter element oil outlet solenoid valve 644 is opened, and the filtering and liquid discharge operation is performed again;

[0050] 7) Repeat the above steps 1) to 6) to continuously circulate and filter the oil.

[0051] The present invention uses a method of evacuating the vacuum tank 71 into a vacuum state, and utilizing the pressure difference between the vacuum tank 71 and the filter box 61 to transport the oil. When the oil flows from the filter box 61 to the vacuum tank 71, it is filtered in the reverse direction through the filter element assembly 63, and the filtered impurities are adsorbed on the outer surface of the filter element filter material 632. The filtered oil is output from the inside of the filter element filter material 632. This design is different from the existing forward filtering technology. In the existing forward filtering technology, the oil is output from the inside of the filter element filter material 632 to the outside, and the filtered impurities are accumulated in the filter element filter material 632. When using the existing forward filtering technology, the filtering accuracy of the filter element filter material 632 cannot be too high, otherwise the inside of the filter element assembly 63 will be blocked due to the rapid accumulation of impurities and needs to be replaced immediately. In this way, the consumables of the filter element assembly 63 will be very serious. The invented vacuum negative pressure filtration technology, since the filtered impurities are adsorbed on the outer surface of the filter element filter material 632, when the filter element assembly 63 is clogged with impurities, just start the reverse gas flushing to flush the impurities adsorbed on the outer surface of the filter element filter material 632, thereby ensuring the filtering effect of the filter element filter material 632. At the same time, the impurities flushed down will not affect the re-filtration of the oil when flowing in the filter box 61. In this way, the filter element filter material 632 does not need to be frequently disassembled, replaced or cleaned, which can minimize the consumption of filter materials and save filtration costs. At the same time, in this mode, higher precision ultrafiltration membrane materials can be used as filter materials, thus overcoming the limitation of existing filtration technology that the filtration precision cannot be improved, improving the cleanliness of the oil after filtration, and ensuring the lubrication performance and service life of the equipment using the oil.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A negative pressure ultrafiltration membrane filtration device, comprising an equipment mounting frame (1), a primary filtration tank (2), a first oil pump (3), a heating tank (4), an oil storage tank (5), an ultrafiltration membrane filtration box device (6), a vacuum tank assembly (7), a second oil pump (8), an oil inlet pipe (9), and an oil outlet pipe (10), characterized in that: The primary filter tank (2), the first oil pump (3), the heating tank (4), the oil storage tank (5), the ultrafiltration membrane filter box device (6), the vacuum tank assembly (7), and the second oil pump (8) are connected in sequence by pipelines and are all fixedly mounted on the equipment mounting frame (1). The primary filter tank (2) is connected to the oil inlet main pipe (9) by pipeline, and the output end of the second oil pump (8) is connected to the oil outlet main pipe (10) by pipeline. A control box (11) is also fixedly mounted on the equipment mounting frame (1). The ultrafiltration membrane filter box device (6) comprises a filter box body (61), a filter element assembly (63), a filter element gland (64), and a filter element locking cover assembly (65). The upper end surface of the filter box body (61) is provided with a plurality of filter element mounting planes evenly arranged. The filter element assembly (63) is inserted through the filter element installation platform (62), the filter element gland (64) is pressed tightly against the filter element assembly (63) and is locked and connected to the filter element installation platform (62) through the filter element locking cover assembly (65), the filter element assembly (63) comprises a filter material fixing flange plate (631) and a filter element filter material (632), the filter element filter material (632) is fixedly installed on the filter material fixing flange plate (631), a filter element oil outlet hole (6311) is penetrated through the filter material fixing flange plate (631), sealing rings (633) are respectively installed on the upper and lower end surfaces of the filter material fixing flange plate (631), and a three-way pipe (641) is connected to the top of the filter element gland (64), The lower end of the three-way pipe (641) is connected to the filter element gland (64), and the left and right ends of the three-way pipe (641) are respectively provided as a filter box oil outlet pipe (642) and a filter element recoil air inlet pipe (643). The filter box oil outlet pipe (642) is provided with a filter element oil outlet solenoid valve (644), and the filter element recoil air inlet pipe (643) is provided with a recoil air inlet electric valve (645). The filter element locking cover assembly (65) comprises an upper locking seat (651), a lower locking seat (652), and a locking screw (654). A plurality of the upper locking seats (651) are fixedly connected to the side edge of the filter element gland (64), a plurality of the lower locking seats (652) are fixedly connected to the side wall of the filter element mounting platform (62), and a plurality of the upper locking seats (651) are fixedly connected to the side edge of the filter element gland (64), a plurality of the lower locking seats (652) are fixedly connected to the side wall of the filter element mounting platform (62), and a plurality of the upper locking seats (651) are fixedly connected to the side edge of the filter element gland (64), and a plurality of the lower locking seats (652) are fixedly connected to the side wall of the filter element mounting platform (62). The lock seat (651) and the lower lock seat (652) are arranged in a one-to-one correspondence, the upper lock seat (651) is provided with a screw movement groove (6511), the lower lock seat (652) is rotatably inserted with a rotating pin shaft (653), the locking screw (654) is vertically welded to the rotating pin shaft (653), and a lifting eye nut (655) is threadedly installed on the locking screw (654), the vacuum tank assembly (7) comprises a vacuum tank (71), a vacuum oil inlet box (72), and a vacuum pump (73), the vacuum oil inlet box (72) is connected to the vacuum tank (71) through a pipeline, and the filter box oil outlet pipe port (642) of the three-way pipe (641) at the top of the filter element gland (64) is connected to the vacuum oil inlet box (72) through a pipeline.

2. A negative pressure ultrafiltration membrane filtration device as claimed in claim 1, characterized in that: A plurality of running wheels (101) are installed at the bottom of the equipment mounting frame (1).

3. A negative pressure ultrafiltration membrane filtration device as claimed in claim 1, characterized in that: A filter bag (21) is installed in the primary filter tank (2); a primary filter tank oil inlet pipe (22) is provided at the upper end of the primary filter tank (2); the primary filter tank oil inlet pipe (22) is connected to the oil inlet main pipe (9); a primary filter tank oil inlet solenoid valve (23) is installed on the connecting pipe between the primary filter tank oil inlet pipe (22) and the oil inlet main pipe (9); a primary filter tank oil outlet (24) is provided at the bottom of the primary filter tank (2); a primary filter tank vent valve (25) is installed at the top of the primary filter tank (2); the primary filter tank oil outlet (24) is connected to the input end pipe of the first oil delivery pump (3); a heating rod (41) is installed in the heating tank (4); a heating tank oil inlet pipe (42) is provided at the bottom of the heating tank (4); the heating tank oil inlet pipe (42) is connected to the output end pipe of the first oil delivery pump (3); A heating tank oil outlet pipe (43) is provided at the top of the hot tank (4); an oil tank oil inlet pipe (51) is provided at the upper end of the oil storage tank (5); the oil tank oil inlet pipe (51) is connected to the heating tank oil outlet pipe (43); an oil tank oil outlet pipe (52) is provided at the bottom of the oil storage tank (5); the oil tank oil outlet pipe (52) is connected to the ultrafiltration membrane filter box device (6) by pipeline; an air release elbow (53) is provided at the top of the oil storage tank (5); a first viewing window (55) is installed on the side wall of the oil storage tank (5) for observing the state of the oil in the oil storage tank (5); a first liquid level pipe (56) is installed on the side wall of the oil storage tank (5) for observing the liquid level height of the oil storage tank (5); and a first float liquid level controller (57) is installed on the oil storage tank (5) for controlling the oil level height of the oil storage tank (5).

4. A negative pressure ultrafiltration membrane filtration device as claimed in claim 3, characterized in that: The top of the filter box (61) is provided with a box top air outlet pipe (611), the lower end of the side wall of the filter box (61) is provided with a box bottom air outlet pipe (612), the top of the oil storage tank (5) is connected to two air intake elbows (54), the two air intake elbows (54) are respectively connected to the box top air outlet pipe (611) and the box bottom air outlet pipe (612), the highest height of the filter box (61) is lower than the lowest oil level control height of the first float liquid level controller (57), the upper end of the filter box (61) is connected to an oil receiving ring groove (66) along the outer side wall, and the oil receiving ring groove (66) is connected to a waste oil delivery pipe. An outlet pipe (661) is provided, wherein a waste oil outlet valve (662) is installed on the waste oil outlet pipe (661), a filter box oil inlet pipe (67) is connected to the side wall of the filter box body (61), the filter box oil inlet pipe (67) is connected to the oil storage tank oil outlet pipe (52) by pipeline, a filter box oil return pipe (68) is provided at the bottom of the filter box body (61), a primary filter tank oil inlet pipe (22) is connected to a primary filter tank oil return pipe port (26), the filter box oil return pipe (68) is connected to the primary filter tank oil return pipe port (26) by pipeline, and the primary filter tank oil return pipe port (26) is arranged after the primary filter tank oil inlet solenoid valve (23).

5. A negative pressure ultrafiltration membrane filtration device as claimed in claim 1, characterized in that: A vacuum pressure gauge (721) is installed on the vacuum oil inlet box (72); a vacuum tank air suction port (711) is provided on the top of the vacuum tank (71); the vacuum tank air suction port (711) is connected to a vacuum pump (73) pipeline; the vacuum pump (73) is connected to a cooling water tank (74) for circulating cooling of the vacuum pump (73); an air filter (75) is installed on the pipeline connecting the vacuum tank air suction port (711) and the vacuum pump (73); and a second float liquid level controller (76) is installed on the vacuum tank (71) for controlling the oil level in the vacuum tank (71). The top of the vacuum tank (71) is also connected to a vacuum tank air inlet pipe (77), and a vacuum tank air inlet solenoid valve (771) is installed on the vacuum tank air inlet pipe (77). The bottom of the vacuum tank (71) is provided with a vacuum tank oil outlet (712), and the vacuum tank oil outlet (712) is connected to the input end pipeline of the second oil delivery pump (8). A second viewing window (713) is installed on the side wall of the vacuum tank (71) for observing the state of the oil in the vacuum tank (71), and a second liquid level tube (714) is installed on the side wall of the vacuum tank (71) for observing the liquid level height of the vacuum tank (71).

6. A negative pressure ultrafiltration membrane filtration device as claimed in claim 5, characterized in that: The first oil delivery pump (3), the second oil delivery pump (8), the primary filter tank oil inlet solenoid valve (23), the first float liquid level controller (57), the second float liquid level controller (76), the vacuum tank air inlet solenoid valve (771), the recoil air inlet electric valve (645), and the filter element oil outlet solenoid valve (644) are all connected to a control box (11) by lines. The control box (11) is provided with an oil temperature control area (111). The control box (11) is provided with a plurality of control buttons (112).

7. A method for using a negative pressure ultrafiltration membrane filtration device, applied to a negative pressure ultrafiltration membrane filtration device as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: 1) Start the equipment, open the primary filter tank oil inlet solenoid valve (23), start the first oil pump (3), and suck the oil from the oil inlet main pipe (9) into the primary filter tank (2), where large particles of impurities are filtered out through the filter bag (21); 2) setting the oil temperature of the oil temperature control area (111) of the control box (11) to 40 degrees, delivering the oil after primary filtration to the heating tank (4) through the first oil delivery pump (3), and heating the oil through the heating rod (41) in the heating tank (4); 3) The heated oil flows into the oil storage tank (5). Since the oil storage tank (5) is connected to the filter box (61) of the ultrafiltration membrane filter box device (6), the oil levels of the oil storage tank (5) and the filter box (61) rise synchronously. An oil return pipeline is provided at the bottom of the filter box (61). The oil flows back to the primary filter tank (2) through the oil return pipeline and goes through steps 1) and 2) again. This cycle is repeated until the flowing oil temperature rises to 40 degrees. 4) The vacuum pump (73) is started to evacuate the vacuum tank (71). Under the influence of the pressure difference, the oil in the filter box (61) is filtered by the filter element assembly (63) and then output from the filter element oil outlet solenoid valve (644) end of the three-way pipe (641) at the top of the filter element gland (64) to the vacuum oil inlet box (72) and finally flows into the vacuum tank (71). Impurities filtered out by the filter element assembly (63) remain in the filter box (61) and on the surface of the filter element assembly (63); 5) The oil level in the vacuum tank (71) rises. When the oil level rises to the oil level control position of the second float liquid level controller (76), the second oil delivery pump (8) is started, and the filtered oil is discharged from the oil outlet main pipe (10); 6) The filter element backwash air inlet (643) of the top three-way pipe (641) of the filter element gland (64) is connected to an external air source. After a period of filtering operation, the filter element oil outlet solenoid valve (644) of the top three-way pipe (641) of the filter element gland (64) is closed, and the backwash air inlet electric valve (645) is opened. Backwash air enters from the filter element backwash air inlet (643) and impacts the filter element assembly (63) in the reverse direction, thereby blowing off the solid particle impurities adsorbed on the surface of the filter element filter material (632) to ensure the filtering effect of the filter element filter material (632). After the backwash operation, the backwash air inlet electric valve (645) is closed, and the filter element oil outlet solenoid valve (644) is opened to perform the filtering and liquid discharge operation again. 7) Repeat the above steps 1) to 6) to continuously circulate and filter the oil.

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