Filter assembly and oil filter

Abstract

The application relates to the technical field of filtering equipment, and discloses a filtering assembly and an oil filter. The filtering assembly comprises a first shell, an oil inlet, an oil outlet and a dirt outlet, a first filter element arranged in the first shell, the oil inlet and the dirt outlet being communicated with the first filter element, oil entering the first filter element through the oil inlet, a first air bag arranged in the first filter element, a second air bag arranged in an oil storage tank, and a gas pressure adjusting device connected with the first air bag and the second air bag and used for adjusting the gas pressure of the first air bag and the second air bag. When the filtering assembly is in a cleaning mode, the oil inlet is closed, the first air bag is contracted by the gas pressure adjusting device, the second air bag is expanded, the oil flowing out of the oil outlet is returned to the first shell from the oil storage tank and flows to the inside of the first filter element, so that the blocking objects attached to the first filter element are flushed, and the blocking objects are discharged from the first shell through the dirt outlet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filtering equipment, in particular to a filtering assembly and an oil filter. BACKGROUND

[0002] At present, the oil filter is widely used in the on-site treatment of production oil.

[0003] In the related art, when cleaning the filter element of the oil filter, the oil outlet needs to be reversed to the oil inlet. Reversing the pipeline is time-consuming and laborious, and air and moisture may be introduced, which reduces the oil quality in the equipment and requires re-filtering. SUMMARY

[0004] The present application aims to at least solve the problem in the prior art or related art that the oil outlet needs to be reversed to the oil inlet when cleaning the filter element of the oil filter, which is time-consuming and laborious and also reduces the oil quality in the equipment.

[0005] To this end, the present application provides a filtering assembly in the first aspect.

[0006] The present application provides an oil filter in the second aspect.

[0007] Therefore, the present application provides a filtering assembly, which comprises a first shell, an oil inlet, an oil outlet and a blowdown port are arranged on the first shell; a first filter element is arranged in the first shell, the oil inlet and the blowdown port are communicated with the first filter element, and oil enters the first filter element through the oil inlet; a first air bag is arranged in the first filter element; an oil storage tank is arranged outside the first shell, and the oil filtered by the first filter element enters the oil storage tank through the oil outlet; a second air bag is arranged in the oil storage tank; and a gas pressure adjusting device is connected with the first air bag and the second air bag, and is used for adjusting the gas pressure of the first air bag and the second air bag; wherein, in a cleaning mode, the oil inlet is closed, the first air bag is contracted by the gas pressure adjusting device, the second air bag is expanded, the oil flowing out of the oil outlet flows back to the first shell from the oil storage tank and flows to the inside of the first filter element, so as to flush the blockage attached to the first filter element, and the blockage is discharged out of the first shell through the blowdown port.

[0008] The filtering assembly provided by the present application can be used for filtering transformer oil, and the filtering assembly comprises a first shell, a first filter element, a first air bag, an oil storage tank, a second air bag and a gas pressure adjusting device. Specifically, the first shell is provided with an oil inlet, an oil outlet and a blowdown port. The first filter element is arranged in the first shell, and the oil inlet and the blowdown port are communicated with the first filter element, that is, the oil can directly enter the first filter element through the oil inlet, and the oil dirt in the first filter element can be directly discharged out of the first shell through the blowdown port. The oil storage tank is arranged outside the first shell, and the oil filtered by the first filter element enters the oil storage tank through the oil outlet.

[0009] Further, the first filter element is provided with a first air bag, the first air bag is made of rubber, the first air bag is connected with the air pressure adjusting device, the air pressure adjusting device is used for adjusting the air pressure in the first air bag, so that the first air bag is inflated or shrunk. The oil tank is provided with a second air bag, the second air bag is connected with the air pressure adjusting device, and the air pressure adjusting device is also used for adjusting the air pressure in the second air bag, so that the second air bag is inflated or shrunk.

[0010] When the filter assembly is in the cleaning mode, the oil inlet is closed, the oil supply to the first filter element is stopped, the first shell and the oil tank become a sealed space, the first shell and the oil tank are communicated through the oil outlet, the air pressure adjusting device is connected with the first air bag to make the first air bag shrink, the air pressure adjusting device is connected with the second air bag to make the second air bag inflate, under the condition that the first air bag shrinks and the second air bag inflates, the inflated second air bag will press the clean oil in the oil tank, so that the oil flowing into the oil tank from the oil outlet is backflowed into the first shell, the oil backflowing into the first shell flows to the inside of the first filter element, which can flush the blocking objects attached to the filter membrane of the first filter element, the blocking objects fall off from the filter membrane and are discharged out of the first shell through the dirt outlet. In this way, the first filter element is cleaned.

[0011] In the related art, when the filter element is cleaned, the oil outlet is reversed as the oil inlet, and the pipeline is reversed, which is time-consuming and laborious, and air and moisture are introduced, which reduces the oil quality in the equipment and requires re-filtering of the oil, which slightly reduces the quality of the clean oil in the equipment for a period of time, affecting the working hours. The present application provides a first air bag in the first filter element and a second air bag in the oil tank, and by adjusting the air pressure of the first air bag and the second air bag, the oil flowing out of the oil outlet can be backflowed into the first filter element, the attached objects blocking the first filter element are removed, the service life of the filter element is improved, the failure rate of the oil filtering equipment is reduced, the operation of reversing the pipeline is avoided, and the oil purification time is saved.

[0012] In addition, the filter assembly in the above technical solution provided by the present application can also have the following additional technical features:

[0013] In the above technical solution, the air pressure adjusting device comprises: a first vacuum pipe connected with the first air bag, the first vacuum pipe being used for vacuumizing the first air bag; and a first vacuum valve arranged in the first vacuum pipe, the first vacuum valve being used for opening or closing the first vacuum pipe.

[0014] In the technical solution, the air pressure adjusting device comprises a first vacuum pipe and a first vacuum valve, one end of the first vacuum pipe is connected to a vacuumizing device, the other end of the first vacuum pipe is connected to a first air bag, the first vacuum valve is an electromagnetic valve and can be controlled by a PLC. Specifically, the first vacuum valve is arranged on the first vacuum pipe and is used to open or close the first vacuum pipe. When the first vacuum valve is opened, the first vacuum pipe is used to vacuumize the first air bag. After the air in the first air bag is extracted, the first air bag will shrink. When the first vacuum valve is closed, the vacuumizing of the first air bag is stopped. It should be noted that the shrinkage of the first air bag has a certain limit. When the first air bag reaches the shrinkage limit, the first vacuum valve is controlled to be closed to avoid damage to the first air bag.

[0015] Optionally, the air pressure adjusting device further comprises a second vacuum pipe and a second vacuum valve. The second vacuum pipe is connected to a second air bag and is used to vacuumize the second air bag. The second vacuum valve is arranged on the second vacuum pipe and is used to open or close the second vacuum pipe.

[0016] In any of the above technical solutions, the air pressure adjusting device further comprises a first air supplement pipe connected to the first air bag, the first air supplement pipe being used to inflate the first air bag; a first air supplement valve arranged on the first air supplement pipe, the first air supplement valve being used to open or close the first air supplement pipe; and wherein the filter assembly is in a filtering mode, the first air supplement pipe is connected to the first air bag, and the first air bag expands to extrude the oil in the first filter element into the first housing.

[0017] In the technical solution, the air pressure adjusting device further comprises a first air supplement pipe and a first air supplement valve, the first air supplement valve is an electromagnetic valve and can be controlled by a PLC. Specifically, the first air supplement pipe is connected to the first air bag and is used to inflate the first air bag. The first air supplement valve is arranged on the first air supplement pipe and is used to open or close the first air supplement pipe. When the first air supplement valve is opened, the first air bag is inflated. When the first air supplement valve is closed, the inflation is stopped. It should be noted that the expansion of the first air bag has a certain limit. When the first air bag reaches the expansion limit, the first air supplement valve is controlled to be closed to avoid damage to the first air bag.

[0018] Optionally, the air pressure adjusting device further comprises a second air supplement pipe and a second air supplement valve. The second air supplement pipe is connected to the second air bag and is used to inflate the second air bag. The second air supplement valve is arranged on the second air supplement pipe and is used to open or close the second air supplement pipe.

[0019] When the filtering assembly is in the filtering mode, the oil inlet is communicated with the first filter element, oil enters the first filter element through the oil inlet, the oil outlet is communicated with the first shell, the first air supplement valve is opened, air is supplemented into the first air bag, the first air bag is inflated and expands to press the oil in the first filter element, the oil in the first filter element is filtered through the first filter element in the state of being pressed, and the water in the oil can be filtered more effectively in the state of being pressed.

[0020] In any of the above technical solutions, the filtering assembly further comprises a support frame arranged in the first filter element, the support frame being used for mounting and positioning the first filter element, and the first air bag being located in the support frame.

[0021] In the technical solution, the filtering assembly further comprises a support frame. The support frame is arranged in the first filter element, and the first air bag is arranged in the support frame. The support frame can be cylindrical, the outer wall surface of the support frame is provided with a guide groove, the first filter element can be cylindrical, the first filter element is sleeved outside the support frame, the inner wall surface of the first filter element is provided with a convex structure, the convex structure can be matched with the guide groove of the support frame, so that the support frame can realize auxiliary fixing of the first filter element and avoid shaking of the first filter element. The support frame can keep the first air bag and the first filter element at a certain distance, avoid the first air bag from being attached to the filter membrane of the first filter element during movement, and also limit the back and forth floating or tilting of the first air bag that expands and shrinks.

[0022] In any of the above technical solutions, the bottom of the first filter element has a downward inclined slope in the height direction, the pollution discharge port is communicated with the slope, and the slope is used for collecting sundries.

[0023] In the technical solution, the bottom of the first filter element has a downward inclined slope in the height direction, the downward inclined slope can be funnel-shaped or conical, and the downward inclined slope is convenient for collecting sundries, which are generally metal scraps or impurities. The pollution discharge port is communicated with the slope, so as to discharge the sundries from the pollution discharge port.

[0024] In any of the above technical solutions, the filtering assembly further comprises an oil inlet valve arranged in the oil inlet, the oil inlet valve being used for opening or closing the oil inlet; an oil outlet valve arranged in the oil outlet, the oil outlet valve being used for opening or closing the oil outlet; and a pollution discharge valve arranged in the pollution discharge port, the pollution discharge valve being used for opening or closing the pollution discharge port.

[0025] In the technical solution, the filtering assembly further comprises an oil inlet valve, an oil outlet valve and a blowdown valve. The oil inlet valve, the oil outlet valve and the blowdown valve are solenoid valves and can be controlled by a PLC. Specifically, the oil inlet valve is arranged at the oil inlet port and is used to open or close the oil inlet port. When the oil inlet valve is opened, the oil inlet passage of the first filter element is opened. When the oil inlet valve is closed, the oil inlet passage of the first filter element is closed. The oil outlet valve is arranged at the oil outlet port and is used to open or close the oil outlet port. When the oil outlet valve is opened, the oil outlet passage of the first housing is opened. When the oil outlet valve is closed, the oil outlet passage of the first housing is closed. The blowdown valve is arranged at the blowdown port and is used to open or close the blowdown port. When the blowdown valve is opened, the blowdown passage of the first filter element is opened. When the blowdown valve is closed, the blowdown passage of the first filter element is closed.

[0026] In any of the above technical solutions, the filtering assembly further comprises a second filter element sleeved on the first housing, the first housing being in communication with the second filter element, and a third air bag being arranged in the second filter element.

[0027] In the technical solution, the application provides a double-layer filtering structure. On the basis of the original first filter element and the first housing, the filtering assembly further comprises a second filter element and a second housing. Specifically, the second filter element is sleeved on the first housing, and the second filter element is in communication with the oil outlet port of the first housing. A third air bag capable of adjusting air pressure is arranged in the second filter element. The third air bag is a rubber product, and the third air bag is located between the first housing and the second filter element. The second housing is sleeved on the second filter element. The oil liquid filtered by the second filter element enters the second housing and is discharged from the oil outlet port of the second housing.

[0028] In any of the above technical solutions, the filtering function of the second filter element is different from that of the first filter element.

[0029] In the technical solution, the filtering function of the second filter element is different from that of the first filter element. When the first filter element is used for 40um-100um coarse filtering, the second filter element can be used for 20um-40um fine filtering. The second filter element can also be used for 20um-40um special filtering. The special filtering can be set according to special requirements of users, such as adding a chemical agent inlet to remove the acidity or alkalinity of the oil liquid, or using a wire gap type or glass fiber filter cloth structure to eliminate foam in the oil liquid.

[0030] In any of the above technical solutions, the first filter element can be one of a magnetic filter element, a sintered filter element, a glass fiber coalescing filter element and a non-woven material filter element; and the second filter element can be another one of the magnetic filter element, the sintered filter element, the glass fiber coalescing filter element and the non-woven material filter element.

[0031] In the technical solution, the filter element can be one of a magnetic filter element, a sintered filter element, a glass fiber coalescing filter element and a non-woven material filter element. The first filter element can be one of the filter elements, and the second filter element can be another one of the filter elements.

[0032] Specifically, the magnetic filter element can filter out metal particles in the oil, and the sintered filter element, the glass fiber coalescing filter element and the non-woven material filter element are mainly used for fine filtration of 5-10um and superfine filtration of 1-5um.

[0033] The second aspect of the present application provides an oil filter, comprising the filter assembly in any of the above technical solutions.

[0034] The oil filter provided by the present application comprises the filter assembly in any of the above technical solutions, and thus has all the beneficial effects of the filter assembly, which will not be described here.

[0035] In actual application, the oil filter provided by the present application can be a vacuum oil filter, which has a wide range of applications in on-site treatment of production oil. The vacuum oil filter can treat transformer oil, turbine oil, machine tool lubricating oil, switch oil and mutual inductor oil. After industrial oil is used for a period of time, water pollution and particle pollution may occur in the oil, which can accelerate the deterioration of the oil, speed up metal fatigue, aggravate the wear of hydraulic components, and cause the dielectric strength of insulating oil to be lost. The vacuum oil filter can treat the oil without stopping production, reduce the production operation cost, prevent waste oil from being burned and discharged, and avoid environmental pollution.

[0036] The vacuum oil filter comprises an oil inlet filtration system. The oil inlet filtration system comprises a coarse filter, a fine filter and a special filter. The oil inlet filtration system is used to filter the oil in advance. The coarse filter is 40-100um, the fine filter is 20-40um, and the special filter is 20-40um. The special filter is set according to the special requirements of the user, such as adding a chemical agent inlet to remove the acidity or alkalinity of the oil, using a wire gap type or glass filter cloth structure to eliminate oil foam, and closing the selection valve during use.

[0037] The vacuum oil filter also comprises an oil outlet filtration system. The oil outlet filtration system comprises an oil pump, a safety valve, a metal filter (10-20um), a fine filter (5-10um) and a superfine filter (1-5um). The main function of the oil outlet filtration system is to pump the oil out of the vacuum tank, and then return the oil to the working tank (tank) after multiple fine filtration. The oil pump generally uses a self-priming hydraulic device with large vacuum degree, such as a gear pump or a screw pump. The nominal displacement of the oil pump is the main parameter of the oil filter, i.e. the nominal flow rate, which is also the main parameter for the design and calculation of the oil filter. The metal filter element is a magnetic filter element to remove metal particles in the oil. The fine filter and the superfine filter are generally sintered or glass fiber coalescing, non-woven material filter elements. The filtration capacity of the filter element must be 3-5 times the nominal displacement of the oil pump. When the filter element is blocked, the safety valve is automatically opened to protect the oil pump and the filtration device.

[0038] Additional aspects and advantages of the present application will become apparent from the following description with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, including the accompanying drawings, in which:

[0040] Figure 1 A structural schematic diagram of a filter assembly of one embodiment of the present application is shown;

[0041] Figure 2 A structural schematic diagram of a filter assembly of another embodiment of the present application is shown;

[0042] Figure 3 A structural schematic diagram of a filter assembly of yet another embodiment of the present application is shown.

[0043] Wherein, Figures 1 to 3 The correspondence between the reference signs in the drawings and the component names is as follows:

[0044] 100 filter assembly, 110 first housing, 112 oil inlet, 114 oil outlet, 116 blowdown port, 120 first filter element, 122 inclined surface, 130 first air bag, 132 oil storage tank, 134 second air bag, 140 air pressure adjusting device, 142 first vacuum pipe, 144 first vacuum valve, 146 first air supplement pipe, 148 first air supplement valve, 150 support frame, 160 oil inlet valve, 162 oil outlet valve, 164 blowdown valve, 170 second filter element, 172 third air bag, 180 second housing. DETAILED DESCRIPTION

[0045] In order to enable a more complete understanding of the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0046] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0047] The following refers to Figures 1 to 3 The filter assembly 100 and the oil filter machine provided by the embodiments of the present application are described in detail below with reference to specific embodiments and application scenarios.

[0048] As Figure 1 and Figure 2As shown, the first aspect of the present application provides a filter assembly 100, comprising: a first shell 110, the first shell 110 being provided with an oil inlet 112, an oil outlet 114 and a blowdown port 116; a first filter element 120 arranged in the first shell 110, the oil inlet 112 and the blowdown port 116 being communicated with the first filter element 120, and oil entering the first filter element 120 through the oil inlet 112; a first air bag 130 arranged in the first filter element 120; an oil storage tank 132 arranged outside the first shell 110, the oil filtered by the first filter element 120 entering the oil storage tank 132 through the oil outlet 114; a second air bag 134 arranged in the oil storage tank 132; and a gas pressure adjusting device 140 connected with the first air bag 130 and the second air bag 134, the gas pressure adjusting device 140 being used for adjusting the gas pressure of the first air bag 130 and the second air bag 134; wherein, when the filter assembly 100 is in a cleaning mode, the oil inlet 112 is closed, the first air bag 130 is contracted by the gas pressure adjusting device 140, the second air bag 134 is expanded, and the oil flowing out of the oil outlet 114 flows back to the inside of the first shell 110 from the oil storage tank 132 and flows to the inside of the first filter element 120, so as to flush the blockage attached to the first filter element 120, and the blockage is discharged out of the first shell 110 through the blowdown port 116.

[0049] The filter assembly 100 provided by the present application comprises a first shell 110, a first filter element 120, a first air bag 130, an oil storage tank 132, a second air bag 134 and a gas pressure adjusting device 140. Specifically, the first shell 110 is provided with an oil inlet 112, an oil outlet 114 and a blowdown port 116. The first filter element 120 is arranged in the first shell 110, and the oil inlet 112 and the blowdown port 116 are communicated with the first filter element 120, that is, oil can directly enter the first filter element 120 through the oil inlet 112, and the oil dirt in the first filter element 120 can be directly discharged out of the first shell 110 through the blowdown port 116. The oil storage tank 132 is arranged outside the first shell 110, and the oil filtered by the first filter element 120 enters the oil storage tank 132 through the oil outlet 114.

[0050] Further, the first air bag 130 is arranged in the first filter element 120, the first air bag 130 being a rubber product, the first air bag 130 being connected with the gas pressure adjusting device 140, and the gas pressure adjusting device 140 being used for adjusting the gas pressure in the first air bag 130 to make the first air bag 130 expand or contract. The second air bag 134 is arranged in the oil storage tank 132, the second air bag 134 being connected with the gas pressure adjusting device 140, and the gas pressure adjusting device 140 also being used for adjusting the gas pressure in the second air bag 134 to make the second air bag 134 expand or contract.

[0051] In the cleaning mode of the filter assembly 100, the oil inlet 112 is closed, the oil supply to the first filter element 120 is stopped, the first housing 110 and the oil tank 132 form a sealed space, the first housing 110 and the oil tank 132 are communicated through the oil outlet 114, the air pressure adjusting device 140 is connected to the first air bag 130 to make the first air bag 130 contract, the air pressure adjusting device 140 is connected to the second air bag 134 to make the second air bag 134 expand, under the condition that the first air bag 130 contracts while the second air bag 134 expands, the expanded second air bag 134 will squeeze the clean oil in the oil tank 132, so that the oil flowing into the oil tank 132 from the oil outlet 114 is backflowed into the first housing 110, the backflowed oil into the first housing 110 flows to the inside of the first filter element 120, can flush the blocking objects attached to the filter membrane of the first filter element 120, the blocking objects fall off the filter membrane and are discharged out of the first housing 110 through the dirt outlet 116. In this way, the cleaning of the first filter element 120 is realized.

[0052] In the related art, when cleaning the filter element, the oil outlet is reversed as the oil inlet, the pipeline is reversed, time and effort are wasted, air and moisture are introduced, the oil quality in the equipment is reduced, the oil needs to be filtered again, the cleaning oil quality of the equipment is slightly reduced for a period of time, and the working hours are affected. In the present application, the first air bag 130 is arranged in the first filter element 120, the second air bag 134 is arranged in the oil tank 132, and the air pressure of the first air bag 130 and the second air bag 134 is adjusted, so that the oil flowing out of the oil outlet 114 is backflowed into the first filter element 120, the attached objects blocking the first filter element 120 are removed, the service life of the filter element is improved, the failure rate of the oil filtering equipment is reduced, the operation of reversing the pipeline is avoided, and the oil purification time is saved.

[0053] In the above embodiment, as shown in Figure 2 The air pressure adjusting device 140 includes a first vacuum pipe 142 connected to the first air bag 130, the first vacuum pipe 142 being used for vacuumizing the first air bag 130, and a first vacuum valve 144 arranged in the first vacuum pipe 142, the first vacuum valve 144 being used for opening or closing the first vacuum pipe 142.

[0054] In this embodiment, the air pressure adjusting device 140 comprises a first vacuum pipe 142 and a first vacuum valve 144. One end of the first vacuum pipe 142 is connected to a vacuumizing device, and the other end of the first vacuum pipe 142 is connected to the first air bag 130. The first vacuum valve 144 is an electromagnetic valve and can be controlled by a PLC. Specifically, the first vacuum valve 144 is arranged on the first vacuum pipe 142 and is used to open or close the first vacuum pipe 142. When the first vacuum valve 144 is opened, the first vacuum pipe 142 performs vacuumizing on the first air bag 130. After the air in the first air bag 130 is sucked out, the first air bag 130 will shrink. When the first vacuum valve 144 is closed, the vacuumizing on the first air bag 130 is stopped. It should be noted that the shrinkage of the first air bag 130 has a certain limit. When the first air bag 130 reaches the shrinkage limit, the first vacuum valve 144 is controlled to be closed to avoid damage to the first air bag 130.

[0055] In actual application, the air pressure adjusting device 140 further comprises a second vacuum pipe and a second vacuum valve. The second vacuum pipe is connected to the second air bag 134 and is used to perform vacuumizing on the second air bag 134. The second vacuum valve is arranged on the second vacuum pipe and is used to open or close the second vacuum pipe.

[0056] In any of the above embodiments, as shown in Figure 2 the air pressure adjusting device 140 further comprises a first air supplement pipe 146 connected to the first air bag 130, a first air supplement valve 148 arranged on the first air supplement pipe 146, and the first air supplement valve 148 is used to open or close the first air supplement pipe 146. When the filter assembly 100 is in the filtering mode, the first air supplement pipe 146 is connected to the first air bag 130, and the first air bag 130 expands to extrude the oil in the first filter element 120 into the first housing 110.

[0057] In this embodiment, the air pressure adjusting device 140 further comprises the first air supplement pipe 146 and the first air supplement valve 148. The first air supplement valve 148 is an electromagnetic valve and can be controlled by a PLC. Specifically, the first air supplement pipe 146 is connected to the first air bag 130 and is used to supplement air to the first air bag 130. The first air supplement valve 148 is arranged on the first air supplement pipe 146 and is used to open or close the first air supplement pipe 146. When the first air supplement valve 148 is opened, air is supplemented into the first air bag 130. When the first air supplement valve 148 is closed, the air supplement is stopped. It should be noted that the expansion of the first air bag 130 has a certain limit. When the first air bag 130 reaches the expansion limit, the first air supplement valve 148 is controlled to be closed to avoid damage to the first air bag 130.

[0058] In practical applications, the air pressure adjusting device 140 further comprises a second air supplement pipe and a second air supplement valve. The second air supplement pipe is connected with the second air bag 134 and is used for inflating the second air bag 134. The second air supplement valve is arranged on the second air supplement pipe and is used for opening or closing the second air supplement pipe.

[0059] When the filter assembly 100 is in the filtering mode, the oil inlet 112 is connected with the first filter element 120, the oil enters the first filter element 120 through the oil inlet 112, the oil outlet 114 is connected with the first shell 110, the first air supplement valve 148 is opened, air is supplemented into the first air bag 130, the first air bag 130 is inflated to press the oil in the first filter element 120, the oil in the first filter element 120 is filtered through the first filter element 120 in the pressed state, and the water in the oil can be filtered more effectively in the pressed state. The filtered oil in the first filter element 120 enters the first shell 110 and is discharged through the oil outlet 114.

[0060] In any of the above embodiments, as shown in Figure 2 The filter assembly 100 further comprises a support frame 150 arranged in the first filter element 120, the support frame 150 is used for mounting and positioning the first filter element 120, and the first air bag 130 is located in the support frame 150.

[0061] In this embodiment, the filter assembly 100 further comprises the support frame 150. The support frame 150 is arranged in the first filter element 120, and the first air bag 130 is arranged in the support frame 150. The support frame 150 can be a cylindrical shape, a guide groove is arranged on the outer wall surface of the support frame 150, the first filter element 120 can be a cylindrical shape, the first filter element 120 is sleeved outside the support frame 150, a convex structure is arranged on the inner wall surface of the first filter element 120, the convex structure can cooperate with the guide groove of the support frame 150, so that the support frame 150 can assist in fixing the first filter element 120 and avoid the first filter element 120 from shaking. The support frame 150 can keep the first air bag 130 and the first filter element 120 at a certain distance, so as to avoid the first air bag 130 from sticking to the filter membrane of the first filter element 120 during movement, and the support frame 150 can also limit the back-and-forth floating or tilting of the first air bag 130 which expands and shrinks.

[0062] In practical applications, the support frame 150 is a metal frame, and the first air bag 130 is arranged in the metal frame, so as to avoid the first air bag 130 from sticking to the filter membrane of the first filter element 120.

[0063] In any of the above embodiments, as shown in Figure 2 In the height direction, the bottom of the first filter element 120 has a downward inclined slope 122, the pollution discharge port 116 is connected with the slope 122, and the slope 122 is used for collecting sundries.

[0064] In this embodiment, the bottom of the first filter element 120 has a downwardly inclined slope 122 in the height direction, which can be funnel-shaped or conical, facilitating the collection of sundries, which are generally metal debris or impurities deposited. The drain port 116 is in communication with the slope 122 to facilitate the discharge of sundries from the drain port 116.

[0065] In any of the above embodiments, as shown in Figure 2 the filter assembly 100 further comprises an oil inlet valve 160 arranged at the oil inlet port 112, the oil inlet valve 160 being used to open or close the oil inlet port 112; an oil outlet valve 162 arranged at the oil outlet port 114, the oil outlet valve 162 being used to open or close the oil outlet port 114; and a drain valve 164 arranged at the drain port 116, the drain valve 164 being used to open or close the drain port 116.

[0066] In this embodiment, the filter assembly 100 further comprises the oil inlet valve 160, the oil outlet valve 162 and the drain valve 164. The oil inlet valve 160, the oil outlet valve 162 and the drain valve 164 are solenoid valves and can be controlled by a PLC. Specifically, the oil inlet valve 160 is arranged at the oil inlet port 112, the oil inlet valve 160 being used to open or close the oil inlet port 112, the oil inlet valve 160 being opened to open the oil inlet passage of the first filter element 120, and the oil inlet valve 160 being closed to close the oil inlet passage of the first filter element 120. The oil outlet valve 162 is arranged at the oil outlet port 114, the oil outlet valve 162 being used to open or close the oil outlet port 114, the oil outlet valve 162 being opened to open the oil outlet passage of the first housing 110, and the oil outlet valve 162 being closed to close the oil outlet passage of the first housing 110. The drain valve 164 is arranged at the drain port 116, the drain valve 164 being used to open or close the drain port 116, the drain valve 164 being opened to open the drain passage of the first filter element 120, and the drain valve 164 being closed to close the drain passage of the first filter element 120.

[0067] In any of the above embodiments, as shown in Figure 3 the filter assembly 100 further comprises a second filter element 170 sleeved on the first housing 110, the first housing 110 being in communication with the second filter element 170, and a third air bag 172 being arranged in the second filter element 170; and a second housing 180 sleeved on the second filter element 170.

[0068] In this embodiment, the application provides a double-layer filtering structure, the filtering assembly 100 further comprises a second filter element 170 and a second housing 180 on the basis of the original first filter element 120 and the first housing 110. Specifically, the second filter element 170 is sleeved on the first housing 110, and the second filter element 170 is in communication with the oil outlet 114 of the first housing 110. A third air bag 172 capable of adjusting air pressure is arranged in the second filter element 170, the third air bag 172 is a rubber product, and the third air bag 172 is located between the first housing 110 and the second filter element 170. The second housing 180 is sleeved on the second filter element 170, and the oil liquid filtered by the second filter element 170 enters the second housing 180 and is discharged from the oil outlet of the second housing 180.

[0069] In any of the above embodiments, the filtering function of the second filter element 170 is different from that of the first filter element 120.

[0070] In this embodiment, the filtering function of the second filter element 170 is different from that of the first filter element 120. When the first filter element 120 is used for 40um-100um coarse filtering, the second filter element 170 can be used for 20um-40um fine filtering, and the second filter element 170 can also be used for 20um-40um special filtering. The special filtering can be set according to the special requirements of the user, such as adding a chemical agent inlet to remove the acidity or alkalinity of the oil liquid, using a wire gap type or glass fiber filter cloth structure to eliminate foam in the oil liquid.

[0071] When the first filter element 120 is used for 10um-20um metal filtering, the second filter element 170 can be used for 5um-10um fine filtering, and the second filter element 170 can also be used for 1um-5um ultra-fine filtering.

[0072] In any of the above embodiments, the first filter element 120 can be one of a magnetic filter element, a sintered filter element, a glass fiber coalescing filter element, and a non-woven material filter element; and the second filter element 170 can be another of the magnetic filter element, the sintered filter element, the glass fiber coalescing filter element, and the non-woven material filter element.

[0073] In this embodiment, the filter element can be a magnetic filter element, a sintered filter element, a glass fiber coalescing filter element, and a non-woven material filter element. The first filter element 120 can be one of them, and the second filter element 170 can be another of them.

[0074] Specifically, the magnetic filter element can filter out metal particles in the oil liquid, and the sintered filter element, the glass fiber coalescing filter element, and the non-woven material filter element are mainly used for 5um-10um fine filtering and 1um-5um ultra-fine filtering.

[0075] The second aspect of the application provides an oil filter, comprising: the filtering assembly 100 in any of the above embodiments.

[0076] The oil filter provided by the application comprises the filter assembly 100 of any one of the above embodiments, and thus has all the beneficial effects of the filter assembly 100, which will not be repeated here.

[0077] In actual application, the oil filter provided by the application can be a vacuum oil filter, which has a wide range of uses in the on-site treatment of production oil. The vacuum oil filter can treat transformer oil, turbine oil, machine tool lubricating oil, switch oil and mutual inductor oil and the like. After industrial oil is used for a period of time, water pollution and particle pollution and the like will appear in the oil, which will accelerate the deterioration of the oil, accelerate metal fatigue, aggravate the wear of hydraulic components, and cause the dielectric strength of insulating oil to be lost. The vacuum oil filter can treat the oil without stopping production, reduce the production operation cost, prevent waste oil from being burned and discharged, and avoid environmental pollution.

[0078] The vacuum oil filter comprises an oil inlet filtration system. The oil inlet filtration system is composed of a coarse filter, a fine filter and a special filter. The oil inlet filtration system is used to filter the oil in advance. The coarse filter is 40 um to 100 um, the fine filter is 20 um to 40 um, and the special filter is 20 um to 40 um. The special filter is set according to the special requirements of the user, such as adding a chemical agent inlet to remove the acidity or alkalinity of the oil, using a wire gap type or glass fiber filter cloth structure to eliminate oil foam, and closing the selection valve when in use.

[0079] The vacuum oil filter also comprises an oil outlet filtration system. The oil outlet filtration system is composed of an oil pump, a safety valve, a metal filter (10 um to 20 um), a fine filter (5 um to 10 um) and an ultra-fine filter (1 um to 5 um). The main function of the oil outlet filtration system is to pump the oil out of the vacuum tank, and then return the oil to the working tank (tank) after multiple fine filtration. The oil pump generally should be selected from a hydraulic device with a large self-suction vacuum, such as a gear pump and a screw pump. The nominal displacement of the oil pump is the main parameter of the oil filter, i.e., the nominal flow rate, which is also the main parameter for the design and calculation of the oil filter. The filter core of the metal filter is a filter core with magnetism, which is used to remove metal particles in the oil. The fine filter and the ultra-fine filter are generally sintered or glass fiber coalesced, non-woven material filter cores. The filtration capacity of the filter core must be 3 to 5 times the nominal displacement of the oil pump. When the filter core is blocked, the safety valve is automatically opened to protect the oil pump and the filtration device.

[0080] In a specific embodiment, when the filter assembly 100 is in the filtering mode, the oil inlet valve 160, the oil outlet valve 162 and the first air supplement valve 148 are opened. The blowdown valve 164 and the first vacuum valve 144 are closed. In operation, the first air bag 130 is inflated to press the oil in the first filter element 120, and the oil in the first filter element 120 is filtered through the first filter element 120 in a pressed state, in which the water in the oil can be filtered more effectively, and the filtered oil in the first filter element 120 enters the first housing 110 and is discharged through the oil outlet 114 into the oil storage tank 132.

[0081] When the filter assembly 100 is in the cleaning mode: the oil outlet 114 is connected to the clean oil in the oil storage tank 132. In the first step, the oil outlet valve 162, the oil inlet valve 160, the atmospheric valve, the first vacuum valve 144 and the blowdown valve 164 are closed. In the second step, the oil outlet valve 162 and the first vacuum valve 144 are opened. In the third step, the first vacuum valve 144 is closed, and the blowdown valve 164 and the atmospheric valve are opened. If the blowdown valve 164 has no oil flow, the oil inlet valve 160 can be opened again. In the fourth step, the blowdown valve 164 is closed, and the cleaning of the filter assembly 100 is completed.

[0082] It should be noted that the vacuum oil filter needs to maintain a high vacuum in the device for a long time to better filter the water and gas in the oil, and to avoid the oil absorbing water in the air, which will cause the oil quality to decrease.

[0083] The present application can ensure that no external air enters the filter assembly 100 in the filtering mode. The oil outlet 114 is connected to the oil storage tank 132, and the second air bag 134 is also provided in the oil storage tank 132, which can adjust the volume and will not cause the problem of opening the oil outlet valve 162 but no oil backflow. In the cleaning process, only the blowdown port 116 is connected to the atmosphere, and when the filter assembly 100 includes multiple layers of filter structures, the blowdown valves 164 of the multiple filters are connected together and flow into the waste oil tank through the blowdown pipe. In the related art, oil needs to be backwashed, and the present application only opens one blowdown valve 164, which minimizes the pollution in the filter assembly 100. Simple on-off valve operation avoids pipe pollution and the problem of reconnection of the pipe caused by complex operation. Shorter working hours can be used to operate the cleaning machine in normal production. The air bag volume limits the amount of waste oil flowing out, reduces the waste of raw oil caused by a large amount of oil washing, and reduces the cost of secondary utilization treatment. The sharp corner design at the bottom of the first filter element 120 is beneficial to the deposition of metal debris or impurities.

[0084] In the present application, the term "a plurality" refers to two or more, unless otherwise expressly specified. The terms "mounting", "connected", "connecting", "fixed", and the like are used broadly and encompass both direct and indirect mounting, connecting, and / or fixing, as appropriate for an application. Further, these terms can refer to mechanical and / or electrical and / or magnetic and / or chemical connections.

[0085] In the description of the present application, the terms "one embodiment", "some embodiments", "certain embodiments", etc. do not mean the same embodiment or example, and the above terms do not necessarily mean the same embodiment or example. In addition, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0086] The above only represents the preferred embodiments of the present application, and is not used to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A filter assembly, characterized in that, include: The first housing is provided with an oil inlet, an oil outlet, and a drain outlet; A first filter element is disposed inside the first housing. The oil inlet and the drain outlet are connected to the first filter element, and oil enters the first filter element through the oil inlet. The first airbag is disposed inside the first filter element; An oil storage tank is disposed outside the first housing, and the oil filtered by the first filter element enters the oil storage tank through the oil outlet; The second airbag is installed inside the oil storage tank; An air pressure regulating device is connected to the first airbag and the second airbag, and the air pressure regulating device is used to regulate the air pressure of the first airbag and the second airbag; In the cleaning mode, the oil inlet is closed, the air pressure regulating device causes the first airbag to contract and the second airbag to expand. The oil flowing out of the oil outlet flows back from the oil storage tank into the first housing and into the interior of the first filter element to flush the blockages attached to the first filter element. The blockages are discharged from the first housing through the drain outlet. The filtering component further includes: A support frame is disposed inside the first filter element. The support frame is used for the installation and positioning of the first filter element. The first airbag is located inside the support frame. The outer wall surface of the support frame is provided with a guide groove. The first filter element is sleeved on the outside of the support frame. The inner wall surface of the first filter element is provided with a convex structure that can cooperate with the guide groove of the support frame. The second filter element is fitted onto the first housing, and the first housing is in communication with the second filter element. A third airbag is provided inside the second filter element, and the third airbag is located between the first housing and the second filter element. The second housing is fitted onto the second filter element.

2. The filter assembly according to claim 1, characterized in that, The air pressure regulating device includes: A first vacuum tube is connected to the first airbag, and the first vacuum tube is used to evacuate the first airbag. A first vacuum valve is disposed on the first vacuum tube, and the first vacuum valve is used to open or close the first vacuum tube.

3. The filter assembly according to claim 2, characterized in that, The pressure regulating device further includes: A first air supply tube is connected to the first airbag, and the first air supply tube is used to inflate the first airbag. A first air supply valve is disposed on the first air supply pipe, and the first air supply valve is used to open or close the first air supply pipe. In the filtering mode, the first air supply pipe is connected to the first air bladder, and the first air bladder expands to squeeze the oil in the first filter element into the first housing.

4. The filter assembly according to claim 1, characterized in that, Along the height direction, the bottom of the first filter element has a downward sloping surface, and the drain outlet is connected to the sloping surface, which is used to collect debris.

5. The filter assembly according to any one of claims 1 to 4, characterized in that, Also includes: An oil inlet valve is provided at the oil inlet, and the oil inlet valve is used to open or close the oil inlet. An oil outlet valve is provided at the oil outlet, and the oil outlet valve is used to open or close the oil outlet. A drain valve is provided at the drain outlet, and the drain valve is used to open or close the drain outlet.

6. The filter assembly according to claim 1, characterized in that, The second filter element has a different filtration function than the first filter element.

7. The filter assembly according to claim 6, characterized in that, The first filter element can be one of a magnetic filter element, a sintered filter element, a glass fiber coalescing filter element, and a non-woven material filter element; the second filter element can be another of a magnetic filter element, a sintered filter element, a glass fiber coalescing filter element, and a non-woven material filter element.

8. An oil filter, characterized in that, include: The filter assembly as described in any one of claims 1 to 7.

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