Portable hydraulic oil filtering device capable of being used in low-temperature environment

Abstract

The utility model provides a portable hydraulic oil filtering device which can be used in a low-temperature environment, and solves the problems that low-cost fine filtering cannot be realized, the cost is high and the environment is not protected when hydraulic oil is treated in the prior art. The device comprises a shell, a sealing cover, an oil guide assembly, a filter element assembly and an external assembly, the top of the shell is matched with the sealing cover, and a heat-insulating coating is arranged on the outer surface; the inner side of the bottom of the shell is an oil conveying face, and an external assembly is arranged outside the bottom. An oil inlet channel and an oil outlet hole are formed in the oil conveying surface; an oil inlet, an oil inlet pipe, an oil outlet and an oil outlet pipe are arranged on the external assembly; the filter element assembly is mounted in the filter cavity; the oil guide assembly comprises a handle and an oil guide rod; the outer wall face of the oil guide rod, the upper end of the oil inlet channel and the inner wall face of the filter element assembly define an oil accumulation bin. Hydraulic oil enters the oil accumulation bin through the oil inlet, the oil inlet pipe, the oil inlet channel, the oil guide channel and the oil hole, flows when accumulated to the upper end face of the filter element assembly, and flows out through the oil outlet hole, the oil outlet pipe and the oil outlet after being filtered.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic filter devices, and in particular relates to a portable hydraulic oil filter device that can be used in a low-temperature environment. Background Art

[0002] Mechatronic technology is widely used in special operations equipment. The hydraulic system's operational capabilities determine the equipment's performance. Hydraulic oil, an essential component for the operation of many types of equipment, serves as a transmission and lubrication medium. Its quality and environmental adaptability directly impact the effectiveness of equipment operation. The amount and size of metal powder and particles are key factors affecting hydraulic oil performance. Due to the long operating hours of hydraulic systems, impurities introduced by the environment, and occasional vibration and idling caused by improper operation, varying degrees of external friction are inevitable between the contact surfaces of equipment components. This friction-generated metal powder, such as iron and copper, and their oxide mechanical residues, mix with the hydraulic oil, contaminating it and affecting equipment quality. This can cause repeated wear and tear, impacting performance. Therefore, hydraulic oil requires prompt cleaning and, in severe cases, replacement.

[0003] Currently, the hydraulic oil used in special operations equipment is typically replaced at a fixed interval to ensure its quality. This method relies solely on the hydraulic system's own filter device for filtration, and the entire oil is replaced after a period of use. This method has the following two problems:

[0004] First, it is impossible to achieve low-cost fine filtration. Although the hydraulic system already has a filtering device, the overly precise filtering method will generate a huge pressure drop, thus affecting the normal operation of the equipment. Therefore, the current filtration in the hydraulic system is generally coarse filtration. For example, the more common metal wire mesh can only achieve a filtration accuracy of 20-100μm, and the more advanced metal fiber felt can only achieve a filtration accuracy of 3-80μm, and the cost is extremely expensive. Such a filtration accuracy cannot effectively filter small particles. Therefore, before the hydraulic oil reaches the replacement time, as the equipment is used for a longer time, the quality of the hydraulic oil in the hydraulic system cannot be fully guaranteed, and the viscosity and particle size of the hydraulic oil will increase, which may easily cause the hydraulic system to not work normally, and may even cause the performance of the equipment to decrease, and the equipment cannot exert its due power; this will cause the viscosity and particle size of the hydraulic oil to increase, further affecting the equipment.

[0005] Secondly, it is costly and not environmentally friendly. Regular replacement of the entire oil is not only costly and inefficient in the use of hydraulic oil, but also results in a large amount of waste oil that is difficult to handle and easily pollutes the environment. Untreated oil cannot be used normally in other fields, which easily results in huge waste.

[0006] In view of this, it is necessary to design a hydraulic oil filtering device. Summary of the Invention

[0007] The purpose of the utility model is to solve the shortcomings of the prior art in that it cannot achieve low-cost fine filtration when processing hydraulic oil, and is high in cost and not environmentally friendly, and to provide a portable hydraulic oil filtering device that can be used in low-temperature environments.

[0008] The concept of this utility model:

[0009] In response to the problems existing in the prior art, the present invention intends to design a portable hydraulic oil filter device that can be used during non-working hours for daily maintenance. Since it is used during non-working hours, the filtration accuracy can be made as high as possible without considering its pressure drop, which is not only convenient to use, but also greatly beneficial to extending the life of the hydraulic oil.

[0010] Therefore, the present invention starts from the filtering object - the hydraulic oil itself, first analyzes the pollution source and the influence of temperature on its performance, and makes a preliminary judgment on the design points of the filtering device.

[0011] 1. Sources of hydraulic oil contamination in hydraulic systems:

[0012] 1. Internally generated pollution sources

[0013] During the operation of construction machinery and equipment, its hydraulic system generates heat due to the influence of pressure, which causes the temperature of the hydraulic system to rise sharply, causing the hydraulic oil to be oxidized when heated, thereby generating organic matter, which has a certain corrosive effect on the metal components of the construction machinery and equipment. When the metal components are corroded, gaseous pollutants that are insoluble in the hydraulic oil will also be generated, further affecting the performance of the equipment during the long-term oxidation and wear of the construction machinery and equipment.

[0014] 2. Residual pollution sources in the system

[0015] By analyzing the properties of hydraulic oil, we can know that hydraulic oil has good water absorption. During the normal operation of the hydraulic system, moisture in the air will enter the hydraulic system. Then, when the construction machinery equipment stops working, as the temperature of the hydraulic system drops, the water molecules will merge with the hydraulic oil. This not only reduces the viscosity of the hydraulic oil, but also has a certain impact on the quality of the hydraulic oil.

[0016] 3. External intrusion of pollution sources

[0017] During the processing and assembly of metal components in construction machinery and equipment, some external impurities are easily mixed into the hydraulic system, which will not only cause certain wear on the metal components, but also reduce the performance of various aspects of the hydraulic oil, affecting the normal operation of the construction machinery and equipment.

[0018] 2. Impact of temperature on hydraulic oil:

[0019] Taking into account the complex environment in which construction machinery equipment is used in certain fields, and the possibility of extremely cold working environments, if insulation measures are not taken during the filtering process of hydraulic oil, the oil will freeze. This will not only lead to oil loss, but also have a huge impact on the filtering efficiency and the normal operation of the hydraulic system. Therefore, the filtering device needs to have a certain insulation function.

[0020] In summary, considering the special environment and pollution sources of engineering machinery equipment, in order to ensure the quality of the hydraulic oil working process while extending the service life of the hydraulic oil, this utility model designs a portable hydraulic oil filter device that adapts to the special low-temperature environment and is used outside the hydraulic system.

[0021] To achieve the above objectives, the technical solutions provided by this utility model are:

[0022] A portable hydraulic oil filter device capable of being used in a low temperature environment, which is special in that it comprises a housing, a cover, an oil guide assembly, a filter element assembly and an external assembly;

[0023] The top of the shell is adapted to be installed with the cover, and a filter cavity is formed inside; the outer surface of the shell and the outer surface of the cover are both provided with a thermal insulation coating;

[0024] The inner side of the bottom of the housing is an oil delivery surface, and the outer side of the bottom is provided with the external component;

[0025] An oil inlet channel protruding from the oil delivery surface is coaxially provided on the oil delivery surface, and an oil outlet hole is also provided on the oil delivery surface; the oil outlet hole is located at the lowest point of the oil delivery surface, and the rest of the oil delivery surface forms a slope with the oil outlet hole, so as to facilitate the filtered hydraulic oil to flow out of the filtering device;

[0026] The external component is provided with an oil inlet, an oil inlet pipe, an oil outlet and an oil outlet pipe; wherein the oil inlet is connected to the oil inlet channel through the oil inlet pipe; the oil outlet is connected to the oil outlet hole through the oil outlet pipe;

[0027] The middle portion of the filter element assembly is a hollow structure along the axial direction, and is detachably mounted in the filter cavity; there is a gap between the upper end surface of the filter element assembly and the cover, as well as between the lower end surface and the oil delivery surface; the filter element assembly is composed of two filter elements of different specifications from top to bottom, the upper filter element performs coarse filtration, and the lower filter element performs fine filtration;

[0028] A through hole is coaxially provided in the middle of the cover;

[0029] The oil guide assembly includes a handle and an oil guide rod; the oil guide rod body is provided with an oil hole, the upper end is connected to the handle, and the lower end is coaxially provided with an oil guide channel connected to the oil hole; the lower end of the oil guide rod extends into the housing through the cover through hole and is installed in the oil inlet channel;

[0030] The outer wall of the oil guide rod, the upper end of the oil inlet channel and the inner wall of the filter element assembly enclose an oil storage bin; the oil hole on the oil guide rod is located above the oil inlet channel and is connected to the oil storage bin;

[0031] The hydraulic oil to be filtered enters the oil storage tank through the oil inlet, oil inlet pipe, oil inlet channel, oil guide channel and oil hole. When the hydraulic oil in the oil storage tank accumulates to the upper end surface of the filter element assembly (i.e., the top layer junction), it begins to flow to the surroundings and flows from top to bottom through the filter element assembly. The hydraulic oil filtered by the filter element assembly flows to the oil delivery surface below the filter element assembly and then flows out through the oil outlet hole, oil outlet pipe and oil outlet.

[0032] Furthermore, in order to ensure that the filtered hydraulic oil can flow more smoothly, a plurality of uneven protrusions are provided on the oil delivery surface.

[0033] Furthermore, in order to facilitate the disassembly and assembly of the oil guide rod and to facilitate hand carrying, the handle is vertically installed on the upper end of the oil guide rod.

[0034] Furthermore, in order to facilitate disassembly and assembly and to ensure a secure connection, the lower end of the oil guide rod is threadedly connected to the oil inlet channel.

[0035] Furthermore, in order to facilitate processing and have a soft appearance that is not easy to bump into the operator, the shell is barrel-shaped, the oil inlet channel is columnar in shape, the filter element assembly is a circular cylinder, and accordingly, the cover is also circular as a whole, and the cover gradually bulges from the edge to the middle to ensure that there is a distance from the upper end face of the filter element assembly.

[0036] Furthermore, a sealing gasket is provided at the joint between the cover and the shell.

[0037] Furthermore, the filtration accuracy of the upper filter element is 10 μm, and it also has a water removal function;

[0038] The filtering accuracy of the lower filter element is 0.5 μm.

[0039] Furthermore, the material of the upper filter element is K02;

[0040] The lower filter element is made of a non-woven felt made of 10nm long-fiber polyamide.

[0041] Furthermore, the thickness of the thermal insulation coating is 10 mm, and its thermal conductivity is 0.15 W / (m·°C).

[0042] Furthermore, in order to reduce weight and facilitate processing, the external component is integrated with the shell, located in the middle of the outer side of the shell bottom, with a length equal to the shell bottom and a width of 1 / 3 of the shell bottom.

[0043] Advantages of this utility model:

[0044] 1. The auxiliary hydraulic oil filter device provided by the utility model can adapt to the special low-temperature environment and be used outside the hydraulic system. A detachable double-layer filter element is designed, which first performs coarse filtration to remove water and then performs fine filtration, which significantly improves the filtration efficiency. At the same time, a thermal insulation coating is sprayed on the outside of the device, which fully considers the special application environment. It can make the hydraulic oil flow steadily in the range of -10℃ to 65℃, has a good thermal insulation effect, and can ensure that the hydraulic oil will not freeze during the filtration process, realizing low-cost fine filtration during non-operating time (i.e. maintenance time); there is no need to consider pressure drop during the entire process, and the filtration accuracy can be maximized by selecting the filter element material, thereby extending the service life of the hydraulic oil while ensuring the quality of the hydraulic system working process.

[0045] 2. The upper and lower layers of the filter element of this utility model are made of different materials. The upper layer adopts multi-layer K02 material for coarse filtration and processes the water in the impurities at the same time. The lower layer adopts non-woven felt material for fine filtration. This not only enhances the filtering effect, but also facilitates replacement. Most of the time, only the upper filter element needs to be replaced, which greatly reduces the production cost.

[0046] 3. The outer surface of the filter device of the utility model is insulated, and a composite insulation material is sprayed to form an insulation coating, which can effectively isolate heat loss and can adapt to extreme working environments (for example: -40°C). In this way, the external environment will not affect the relevant properties of the hydraulic oil and thus affect the filtering effect. At the same time, it avoids the huge impact caused by the freezing of the hydraulic oil when the hydraulic oil is filtered and maintained in an extremely cold environment, delaying normal operation, and ensuring the operation effect of the entire hydraulic system.

[0047] 4. The filter device of this utility model offers flexible installation locations. By changing the location of the filter device within the hydraulic system, different effects can be achieved. For example, installation at the oil intake can remove larger impurities; installation at the pump outlet can filter out contaminants that may invade valves and other components; installation in the oil return line can provide indirect filtration. This greatly improves the practicality of the filter device, freeing it from the limitations of installation location. The device can purify the hydraulic oil in almost all hydraulic systems.

[0048] 5. The filtering device of the utility model can be widely used in engineering machinery equipment using hydraulic oil in various environments. It can not only reduce the cost of replacing hydraulic oil and increase the service life of hydraulic oil, but also process waste hydraulic oil. The filter element used has a low cost and can maximize the service life of hydraulic oil with less capital. It has good application prospects.

[0049] 6. The filtering device of the utility model is not limited to filtering hydraulic oil, but can also prevent and control pollutants and realize rapid pollution disposal of waste oil. Some harmful components in the oil can be filtered out through the filter element, reducing the harm to the environment and personnel. At the same time, the contaminated oil can be purified and it can also be used on other equipment that does not have high requirements for oil, which can greatly increase the utilization rate of oil and truly make the best use of it.

[0050] 7. The volume design of the filter device of the utility model is highly controllable, and a large volume structure or a small volume structure can be adopted according to requirements. For equipment with unstable working scenes, the filter device is designed to be portable and external, which is easy to carry. Since it is only used during equipment maintenance, there is no need to consider the impact of filtration accuracy on the pressure drop during operation during the filtration process. The choice of filter element materials in the filter device is more extensive, and the trade-off between cost and accuracy is more flexible. High-precision and more reasonably priced filter materials can be selected, which has a higher cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the internal structure of the hydraulic oil filter device of the utility model;

[0052] Figure 2 This is an overall schematic diagram of the hydraulic oil filtering device of the utility model;

[0053] The numbers in the figure are:

[0054] 1-housing, 2-cover, 3-filter element assembly, 31-upper filter element, 32-lower filter element, 4-oil guide assembly, 41-handle, 42-oil guide rod, 43-oil guide channel, 44-oil hole, 5-oil delivery surface, 6-oil inlet channel, 7-oil outlet hole, 8-external component, 81-oil inlet, 82-oil inlet pipe, 83-oil outlet pipe, 84-oil outlet, 9-oil storage tank. DETAILED DESCRIPTION

[0055] The following is a further detailed description of the present invention with reference to the accompanying drawings and specific embodiments:

[0056] like Figure 1 and Figure 2 As shown, a portable hydraulic oil filtering device that can be used in a low-temperature environment includes a housing, a cover, an oil guide assembly, a filter element assembly, and an external assembly.

[0057] The housing is cylindrical, with the top and cover fitting snugly (a gasket is provided at the joint between the two), forming a filter chamber. Both the housing and cover are coated with an insulating coating. The cover is circular, with a coaxial through-hole in the middle, and gradually rises from the edge to the center.

[0058] The inner bottom of the housing serves as the oil delivery surface, coaxially arranged with a cylindrical oil inlet channel that protrudes from the surface. The surface also features an oil outlet. To ensure smooth flow of filtered hydraulic oil, the surface is also designed with several uneven projections. The outlet is located at its lowest point, while the rest of the surface slopes towards the outlet.

[0059] The external assembly is located in the middle of the outer bottom of the housing and is integrally formed with the housing. Its length is the same as the housing bottom, and its width is one-third of the housing bottom length, which helps to reduce the weight of the entire filter device. The external assembly is equipped with an oil inlet, an oil inlet pipe, an oil outlet, and an oil outlet pipe. The oil inlet is connected to the oil inlet channel through the oil inlet pipe, and the oil outlet is connected to the oil outlet hole through the oil outlet pipe.

[0060] The filter element assembly is a circular cylinder, which is detachably adapted and installed in the filter cavity; there is a distance between the upper end face of the filter element assembly and the cover, as well as between the lower end face and the oil delivery surface; the filter element assembly consists of two filter elements of different specifications from top to bottom, the upper filter element is used for coarse filtration, and the lower filter element is used for fine filtration.

[0061] The oil guide assembly includes a handle and an oil guide rod; the oil guide rod body is provided with an oil hole, the handle is installed vertically at the upper end, and the lower end is coaxially provided with an oil guide channel connected to the oil hole; the lower end of the oil guide rod extends into the shell through the cover through hole and is threadedly installed in the oil inlet channel, and the outer wall surface of the oil guide rod, the upper end of the oil inlet channel and the inner wall surface of the filter element assembly are enclosed to form an oil accumulation bin; the oil hole on the oil guide rod is located above the oil inlet channel and is connected to the oil accumulation bin.

[0062] The working principle is:

[0063] The hydraulic oil to be filtered enters the oil storage tank through the oil pump, the oil inlet pipe, the oil inlet channel, the oil guide channel and the oil hole. When the hydraulic oil in the oil storage tank accumulates to the upper end surface of the filter element assembly (i.e. the top layer junction), it begins to flow to the surroundings and flows from top to bottom through the filter element assembly for step-by-step filtration. The hydraulic oil filtered by the filter element assembly flows to the oil delivery surface below the filter element assembly and then flows out through the oil outlet hole, the oil outlet pipe and the oil outlet.

[0064] The double-layer filter element used in this embodiment has an upper filter material that is mainly used for coarse filtration of impurities and absorbs moisture to a certain extent (i.e., it also has a water removal function) in order to filter impurities with larger diameters, with an accuracy controlled at 10 μm; the lower filter material is mainly used for further fine filtration, and ultimately the accuracy is controlled at 0.5 μm.

[0065] The upper filter layer utilizes the existing multi-layer K02 material. K02 is a three-layer composite fiber material with a polyester upper layer, a polypropylene fiber surface layer, and a polyester bottom layer, manufactured using a chemical bonding process. It offers minimal pressure drop. Compared to K01, K03, RF01, and RF02, K02 has the thinnest surface layer. The thickness of its upper layer is also thin and unevenly distributed. This uneven surface thickness results in a low pressure drop and reduced filtration efficiency. Therefore, using K02 as the upper filter material provides a preliminary filter for metal powders such as iron and copper, achieving a filtration accuracy of approximately 10μm, which improves the filtration performance and service life of subsequent filter elements. In actual experiments, after repeated hydraulic oil filtration tests, it has proven stable operation and effective filtration of metal powders such as iron and copper.

[0066] The lower filter material primarily utilizes a nonwoven felt composed of 10nm long-fiber polyamide, a type of nanofiber filter material. This nonwoven felt further filters metal powder and its oxide mechanical residue, ultimately achieving a filtration accuracy of 0.5μm. During actual experiments, after multiple consecutive hydraulic oil filtration tests, the filter demonstrated stable operation, effective secondary filtration of hydraulic oil, and a final filtration accuracy that met the expected test results.

[0067] The outer surface of the filter device of the utility model is sprayed with a thermal insulation coating. The material of the coating is an existing composite thermal insulation material. The raw materials of the coating are nano-composite iron titanium powder, potassium hexatitanate whiskers (PTW), hollow glass microspheres, TiO2-coated glass microspheres and microporous lightweight fillers. Silicone-modified epoxy resin and organic silane coupling agent are used as the film-forming base material of the composite thermal insulation material to achieve the best thermal insulation effect.

[0068] Among them, nano-composite iron-titanium powder is an active rust-proof pigment. It is formed by treating various forms of phosphate to form an anhydrous polyphosphate, which is then compounded with nanopowder materials such as silicon-based, titanium-based, iron-based oxides, and yttrium oxide. It has certain rust-proof properties. The phosphate radicals in the phosphate react with iron atoms on the surface of steel to form water-insoluble iron phosphate complexes. This complex firmly adheres to the steel surface, acting as a passivation and corrosion inhibitor, and isolating water, oxygen, chloride ions, etc., providing a chemical corrosion protection. Taking advantage of the high surface energy, severe surface coordination deficiency, and easy formation of active adsorption centers of nanomaterials, the coating film is improved in density, toughness, and water resistance, blocking the penetration of water vapor and chloride ions, and further enhancing the physical rust-proof effect of the coating.

[0069] The composition of potassium hexatitanate whiskers is K2Ti6O 13 , interlocking tunnel structure, K + Located in the middle of the tunnel, it has high stability, which makes potassium hexatitanate whiskers have high-temperature sound absorption, chemical stability, insulation, infrared reflection, and excellent corrosion resistance. Potassium hexatitanate whiskers as thermal insulation materials are mainly based on structural insulation, physical insulation, and infrared reflection. Its loose density is 0.1-0.3g / cm 3 , with a specific surface area of ​​11m 2 / g, with mesopore sizes ranging from 90.8 to 1.2 μm in diameter and 30 to 50 μm in length. It has a low thermal conductivity (0.0534 W / (m·K) at room temperature) and a negative temperature coefficient (the higher the temperature, the lower the thermal conductivity), reaching 0.0174 W / (m·K) at 760°C. Its infrared transmittance is low: within a wavelength range of 0.9 to 2.4 μm and a thickness of 0.25 μm, its PTW transmittance is only 8.4%. It is non-toxic, harmless, has a long service life, can withstand temperatures of 1200°C, and exhibits excellent acid, alkali, wear, insulation, mechanical, and physical properties.

[0070] Hollow glass microspheres, primarily composed of borosilicate, are hollow spheres with a particle size of 10-100μm and a wall thickness of 1-2μm. The shell contains N2, CO2, or other inert gases, with a thermal conductivity of approximately 0.07W / (m·K) and a light scattering rate of 80% to 88%. They exhibit low thermal conductivity, high refractive index, excellent thermal insulation, environmental friendliness, non-toxicity, high temperature resistance, corrosion resistance, weather resistance, stain resistance, and excellent leveling properties. The thermal insulation coatings prepared using ultrafine hollow glass microspheres as fillers possess a unique microporous structure, offering excellent heat insulation and reflective properties for both conductive and radiant heat. The varying particle sizes of the spheres complement each other, allowing the hollow glass microspheres to effectively fill gaps in thermal insulation coatings. Their low thermal conductivity imparts excellent thermal insulation properties to the coatings.

[0071] The titanium dioxide in the TiO2 coated glass microsphere material has a strong reflective ability to sunlight energy, especially near-infrared rays, and its reflectance to near-infrared rays is higher than that of microspheres. By coating a layer of TiO2 film on the surface of the microspheres, microspheres with both reflection and heat insulation mechanisms can be obtained.

[0072] Microporous lightweight fillers are made of sepiolite or expanded vermiculite, both of which are excellent thermal insulation materials. Sepiolite is a natural magnesium-rich layered silicate with a needle-like micropore and pore-groove structure. It has a high surface area and strong adsorption capacity. It is needle-shaped, internally porous, and has a low thermal conductivity of 0.07W / (m·K). Expanded vermiculite is a complex layered fragment of iron and magnesium silicate filled with countless tiny pores, with a dry density of 80-120kg / m 3 , the thermal conductivity is 0.047~0.07W / (m·K).

[0073] The relationship between the thickness of the thermal insulation coating (D1-D) and the temperature of the filter device is shown in the following formula:

[0074]

[0075] Where t0 is the medium temperature in the filter device, t s is the external surface temperature of the filter device, t a is the ambient temperature, h is the outdoor heat transfer coefficient, D is the diameter of the filter device, D1 is the total diameter of the filter device and the thermal insulation coating, and λ is the thermal conductivity of the thermal insulation coating;

[0076] Considering the extreme working environment temperature t a It is about -42℃. In this embodiment, the thickness of the thermal insulation coating is about 10mm. Assuming that the outer surface temperature of the filter device is t s The outdoor temperature is -10°C, the outdoor heat transfer coefficient h is 40 W / (m·°C), and the filter diameter D is 16 cm. Then, when a thermal insulation coating with a thermal conductivity of 0.15 W / (m·°C) is used, the medium temperature t0 in the filter device is 40°C. In other words, in an extreme operating environment of around -40°C, the filter device of this embodiment can still enable the hydraulic oil to flow steadily between -10°C and 65°C, thereby achieving the expected insulation effect.

[0077] At the same time, this embodiment also verifies the filtering effect of the filtering device:

[0078] The same oil sample (with excessive particle size) was processed using both the existing filtration device and the filtration device of this embodiment. After 40 minutes, particle size testing was performed. The results showed that the existing filtration device could only filter the oil to NAS grade 11. While this did reduce the particle size, it was still far from being usable. The filtration device of this embodiment, on the other hand, filtered the oil to NAS grade 9, reaching a level suitable for normal use, demonstrating a significant filtration effect.

[0079] The above description is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present invention, and these modifications or replacements should be included in the protection scope of the present invention.

Claims

1. A portable hydraulic oil filter device that can be used in low temperature environments, characterized by: Including housing, cover, oil guide assembly, filter element assembly and external assembly; The top of the shell and the cover are adapted to form a filter cavity; the outer surface of the shell and the outer surface of the cover are both provided with a thermal insulation coating; The inner side of the bottom of the housing is an oil delivery surface, and the outer side of the bottom is provided with the external component; The oil delivery surface is coaxially provided with an oil inlet channel protruding from the oil delivery surface, and the oil delivery surface is also provided with an oil outlet hole; the oil outlet hole is located at the lowest point of the oil delivery surface, and the rest of the oil delivery surface forms a slope with the oil outlet hole; The external component is provided with an oil inlet, an oil inlet pipe, an oil outlet and an oil outlet pipe; wherein the oil inlet is connected to the oil inlet channel through the oil inlet pipe; the oil outlet is connected to the oil outlet hole through the oil outlet pipe; The middle portion of the filter element assembly is a hollow structure along the axial direction, and is detachably mounted in the filter cavity; there is a gap between the upper end surface of the filter element assembly and the cover, as well as between the lower end surface and the oil delivery surface, and the filter element assembly is composed of two filter elements of different specifications from top to bottom, the upper filter element performs coarse filtration, and the lower filter element performs fine filtration; A through hole is coaxially provided in the middle of the cover; The oil guide assembly includes a handle and an oil guide rod; the oil guide rod body is provided with an oil hole, the upper end is connected to the handle, and the lower end is coaxially provided with an oil guide channel connected to the oil hole; the lower end of the oil guide rod extends into the housing through the cover through hole and is installed in the oil inlet channel; The outer wall of the oil guide rod, the upper end of the oil inlet channel and the inner wall of the filter element assembly enclose an oil storage bin; the oil hole on the oil guide rod is located above the oil inlet channel and is connected to the oil storage bin; The hydraulic oil to be filtered enters the oil storage tank through the oil inlet, oil inlet pipe, oil inlet channel, oil guide channel and oil hole. When the hydraulic oil in the oil storage tank accumulates to the upper end surface of the filter element assembly, it begins to flow to the surroundings and flows from top to bottom through the filter element assembly. The hydraulic oil filtered by the filter element assembly flows to the oil delivery surface and then flows out through the oil outlet hole, oil outlet pipe and oil outlet.

2. A portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 1, characterized in that: The oil delivery surface is provided with a plurality of uneven protrusions.

3. The portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 2, characterized in that: The handle is vertically mounted on the upper end of the oil guide rod.

4. The portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 3, characterized in that: The lower end of the oil guide rod is threadedly connected to the oil inlet channel.

5. The portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 4, characterized in that: The shell is in the shape of a cylinder, the oil inlet channel is in the shape of a column, and the filter element assembly is a circular cylinder.

6. The portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 5, characterized in that: A sealing gasket is also provided at the joint between the cover and the shell.

7. A portable hydraulic oil filter device capable of being used in a low temperature environment according to any one of claims 1 to 6, characterized in that: The upper filter element has a filtration accuracy of 10 μm and also has a water removal function; The filtering accuracy of the lower filter element is 0.5 μm.

8. The portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 7, characterized in that: The material of the upper filter element is K02; The lower filter element is made of a non-woven felt made of 10nm long-fiber polyamide.

9. The portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 8, characterized in that: The thickness of the thermal insulation coating is 10 mm, and its thermal conductivity is 0.15 W / (m·°C).

10. The portable hydraulic oil filter device capable of being used in a low temperature environment according to claim 9, characterized in that: The external component is an integral part of the shell and is located in the middle of the outer side of the shell bottom. Its length is the same as the shell bottom and its width is 1 / 3 of the shell bottom.

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