Oil filtering and separating device for preventing clogging

Abstract

This utility model relates to the field of oil filtration technology, solving the problem of filter element pore size being too small in diesel filtration and separation, leading to easy clogging of the filter element during the separation process. Specifically, it discloses an oil filtration and separation device to prevent clogging, comprising a filtration mechanism, a cooling mechanism, and a separation mechanism. The cooling mechanism is connected between the filtration mechanism and the separation mechanism. The filtration mechanism has a multi-stage filter element assembly, the outlet end of which is connected to the inlet end of the cooling mechanism. The separation mechanism has a coalescing filter element for separating oil and water, the inlet end of which is connected to the outlet end of the cooling mechanism. The outlet end of the coalescing filter element is connected to a collection device for collecting separated water. The filter element pore size at the outlet end of the multi-stage filter element assembly is smaller than that of the coalescing filter element. This utility model is used for filtering and separating impurities and water in diesel fuel, featuring anti-clogging and good separation effect.

Description

Technical Field

[0001] This utility model relates to the field of oil filtration technology, and in particular to an oil filtration and separation device that prevents clogging. Background Technology

[0002] Diesel fuel water and impurity filtration and separation technology includes mechanical interception and physical coalescence. Mechanical filtration intercepts solid impurities larger than 1μm through the pore size of paper, metal mesh, or polymer membrane filter elements. Hydrophobic materials can also initially block free water. Coalescing separation is carried out in two steps. First, materials such as glass fibers adsorb tiny water droplets and impurities, causing them to coalesce into larger droplets. Then, a hydrophobic separation filter element completes the oil-water separation. It is suitable for treating free water with a water content of ≤5%, a small amount of emulsified water, and impurities larger than 0.5μm.

[0003] Existing diesel filtration technologies are prone to clogging filter elements, primarily because the rate of impurity accumulation exceeds the filter element's dirt-holding capacity. Diesel impurities exhibit a diverse particle size distribution, including not only large particles but also a large number of fine particles ≤1μm. If a small-pore filter element is selected to improve filtration accuracy, these fine particles will quickly clog the pores. Furthermore, sticky impurities such as asphaltene and colloids will adhere to the filter element surface or pores, further adsorbing more particles and forming an impurity layer. Additionally, the technology has inherent limitations. For instance, in coalescing separation, the coalescing material needs to adsorb impurities and water droplets to achieve coalescence. If the impurity concentration in the diesel is too high, the coalescing material will be filled first, subsequently clogging the subsequent separation filter element. Utility Model Content

[0004] To address the problem in existing diesel filtration and separation technologies where the filter element has a small pore size to improve accuracy, leading to easy clogging of the filter element during the separation process, this invention provides an oil filtration and separation device that prevents clogging.

[0005] The technical solution adopted in this utility model is:

[0006] An oil filtration and separation device for preventing clogging includes a filtration mechanism, a cooling mechanism, and a separation mechanism, wherein the cooling mechanism is connected between the filtration mechanism and the separation mechanism.

[0007] The filtration mechanism is provided with a multi-stage filter element assembly, the outlet end of which is connected to the inlet end of the cooling mechanism. The separation mechanism is provided with a coalescing filter element for separating oil and water, the inlet end of which is connected to the outlet end of the cooling mechanism. The outlet end of the coalescing filter element is connected to a collection device for collecting the separated water. The filter element with a pore size at the outlet end of the multi-stage filter element assembly is smaller than the pore size of the coalescing filter element.

[0008] The multi-stage filter assembly is used to filter oil step by step through multiple sets of filter elements with progressively increasing filtration accuracy. The cooling mechanism is used to cool the oil delivered by the multi-stage filter assembly to the temperature required by the coalescing filter element.

[0009] Furthermore, the multi-stage filter assembly includes a first filter assembly, a second filter assembly, and a third filter assembly connected in sequence. The third filter assembly is provided with a pleated filter element, and at least two sets of the pleated filter elements are arranged in parallel.

[0010] Furthermore, the first filter element assembly is provided with a rod-type filter element, and the second filter element assembly is provided with a bag-type filter element, wherein at least two sets of the bag-type filter elements are arranged in parallel.

[0011] Furthermore, the outlet end of the coalescing filter element is connected to one end of a return pipe, and the other end of the return pipe is connected to the inlet end of the coalescing filter element. The return pipe is used to transport substandard oil products to the coalescing filter element for further filtration and separation.

[0012] Furthermore, the outlet end of the coalescing filter element is connected to one end of a return pipe, and the other end of the return pipe is connected to the inlet end of the cooling mechanism. The return pipe is used to transport the substandard oil to the cooling mechanism to adjust the temperature before it enters the coalescing filter element for further filtration and separation.

[0013] Furthermore, the cooling mechanism includes a cooling water tank and a heat exchange coil. The heat exchange coil is disposed inside the cooling water tank, and its two ends are respectively connected to the outlet end of the multi-stage filter element assembly and the inlet end of the coalescing filter element. The heat exchange coil is used to transfer the heat of the oil to the cooling water in the cooling water tank through contact heat transfer.

[0014] The beneficial effects of this utility model are:

[0015] When the filtration and separation device of this invention is working, the oil first enters the multi-stage filter element assembly of the filtration mechanism. This assembly relies on multiple sets of filter elements with progressively increasing filtration precision to process the oil step by step. It first intercepts large particulate impurities in diesel fuel, and then gradually filters out small-particle impurities, including fine particles. This staged filtration structure avoids the situation in existing technologies where fine particles quickly clog the pores when using small-pore filter elements directly. At the same time, it disperses the dirt-holding pressure of each filter element, reducing the adhesion and accumulation of sticky impurities such as asphalt and gum on the surface and pores of individual filter elements, thus reducing the risk of filter element clogging from the source. Subsequently, the oil that has undergone preliminary filtration enters the cooling mechanism and is cooled to the temperature required by the coalescing filter element, providing suitable environmental conditions for subsequent oil-water separation and ensuring that the coalescing filter element can function stably. After cooling, the oil enters the coalescing filter element of the separation mechanism. Because the pore size of the filter element at the outlet end of the multi-stage filter element assembly is smaller than that of the coalescing filter element, and most of the solid impurities have been removed by the multi-stage filter element in advance, the impurity content in the oil entering the coalescing filter element is greatly reduced. In addition, the coalescing filter element itself has larger pore size, so the impurities contained in the oil coming out of the multi-stage filter element assembly will no longer clog the coalescing filter element. During this process, the coalescing filter element can fully adsorb the tiny water droplets and residual trace impurities in the oil, causing the water droplets to coalesce into larger droplets to achieve oil-water separation. The separated water is finally collected by the collection device.

[0016] This invention not only resolves the contradiction between improving accuracy and avoiding clogging in existing technologies, but also avoids the problem of the agglomerated material being filled with excessively high impurity concentration and clogging the separation filter element by reducing the impurity concentration in advance. Ultimately, it achieves the dual goals of efficient filtration of solid impurities in diesel fuel and effective separation of free water and a small amount of emulsified water. At the same time, it ensures that the filter element is not easily clogged during long-term operation of the device, significantly improving the stability and continuous working capability of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the device structure of this utility model.

[0018] Figure label:

[0019] 1-Filtering mechanism, 2-Cooling mechanism, 3-Separation mechanism, 4-Transfer pump, 5-Control valve

[0020] 11-First filter assembly, 12-Second filter assembly, 13-Third filter assembly

[0021] 31-Coalescing filter element, 32-Collection device, 33-Return pipe. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] This embodiment describes an oil filtration and separation device to prevent clogging, such as... Figure 1 As shown, the system includes a filtration mechanism 1, a cooling mechanism 2, and a separation mechanism 3. The cooling mechanism 2 is connected between the filtration mechanism 1 and the separation mechanism 3. The filtration mechanism 1 is equipped with a multi-stage filter element assembly, the outlet end of which is connected to the inlet end of the cooling mechanism 2. The separation mechanism 3 is equipped with a coalescing filter element 31 for separating oil and water, the inlet end of which is connected to the outlet end of the cooling mechanism 2. The outlet end of the coalescing filter element 31 is connected to a collection device 32 for collecting separated water. The filter element at the outlet end of the multi-stage filter element assembly has a smaller pore size than the coalescing filter element 31.

[0025] In this embodiment, the multi-stage filter assembly is used to filter the oil step by step through multiple sets of filter elements with progressively increasing filtration precision. The cooling mechanism 2 is used to cool the oil delivered by the multi-stage filter assembly to the temperature required by the coalescing filter element 31. During operation, the oil first enters the multi-stage filter assembly of the filtration mechanism 1. This assembly filters the oil step by step through multiple sets of filter elements with progressively increasing filtration precision, first intercepting large particulate impurities in the oil, and then further filtering out fine particulate impurities. This avoids the problem of fine particles quickly clogging the pores due to the direct use of small-pore filter elements in the prior art. Simultaneously, it disperses the dirt-holding pressure of a single-stage filter element, reducing the adhesion and accumulation of sticky impurities such as asphalt and gum on the filter element surface and within the pores. The oil that has completed step-by-step filtration then enters the cooling mechanism 2, which cools the oil to the temperature required by the coalescing filter element 31, providing suitable environmental conditions for subsequent oil-water separation and ensuring that the coalescing filter element 31 can stably perform its separation function. After cooling, the oil enters the coalescing filter element 31 of the separation mechanism 3. Because the pore size of the filter element at the outlet of the multi-stage filter assembly is smaller than that of the coalescing filter element 31, and because the multi-stage filter elements have already removed most solid impurities, the impurity content in the oil entering the coalescing filter element 31 is significantly reduced, preventing clogging of the larger-pore coalescing filter element 31. The coalescing filter element 31 can then fully adsorb tiny water droplets and remaining trace impurities in the oil, causing the water droplets to coalesce into larger droplets, thus achieving oil-water separation. The separated water is ultimately collected by the collection device 32. This device, through the step-by-step action of filtration, temperature regulation, and coalescing separation, effectively solves the contradiction between improving filtration accuracy and easy clogging of filter elements in existing technologies, ensuring long-term stable operation of the device. The structure can be improved by adding a removable pre-treatment filter screen at the inlet of the multi-stage filter assembly to intercept some larger impurities in advance, reducing the burden on subsequent filter elements and further extending their service life.

[0026] like Figure 1As shown, to further improve the function of the device of this utility model, the filtration and separation device is also equipped with a delivery pump 4 for conveying oil and multiple control valves 5 for controlling the opening and closing of the inlet and outlet ends of the filter elements of each part of the filtration mechanism 1. The delivery pump 4 can be set at the inlet end of the filtration mechanism 1, thereby ensuring that the oil is conveyed stably under a certain pressure and flow rate. The opening and closing of the inlet and outlet ends of each filter element assembly can be controlled by the opening and closing of the control valves 5, which facilitates the adjustment of the specific flow channel of the filtration operation and facilitates the individual maintenance and repair of one of the filter element assemblies, thereby improving the controllability of the device.

[0027] Example 2

[0028] This embodiment is based on the foregoing embodiments. In this embodiment, as follows: Figure 1 As shown, the multi-stage filter assembly includes a first filter assembly 11, a second filter assembly 12, and a third filter assembly 13 connected in sequence. The third filter assembly 13 is provided with pleated filter elements, and at least two sets of pleated filter elements are arranged in parallel.

[0029] In a preferred embodiment, the first filter element assembly 11 is provided with a rod-type filter element, and the second filter element assembly 12 is provided with a bag-type filter element, with at least two sets of bag-type filter elements connected in parallel.

[0030] In this embodiment, the multi-stage filter assembly first enters the rod filter element of the first filter element assembly 11. The rod filter element, due to its structural characteristics, performs preliminary filtration, intercepting large particulate impurities in the oil. Next, the oil flows into the bag filter element of the second filter element assembly 12. The bag filter element has a higher filtration accuracy than the rod filter element, further filtering out fine impurities in the oil. At least two sets of these bag filter elements are connected in parallel, increasing the filtration area, reducing the flow velocity of the oil within the filter element, and decreasing the accumulation rate of impurities on the surface of a single filter element. This also avoids the problem of the entire filtration process being interrupted due to clogging of a single filter element. Subsequently, the oil enters the pleated filter element of the third filter element assembly 13. The pleated filter element has even higher filtration accuracy, performing fine filtration of the oil. Again, at least two sets of pleated filter elements are connected in parallel, further improving the efficiency and stability of fine filtration and reducing the risk of clogging. The oil that has completed multi-stage filtration then passes through the cooling mechanism 2 for cooling and the separation mechanism 3 for coalescing filter element 31. Finally, the separated water is collected by the collection device 32. This structure, through the graded combination and parallel arrangement of different types of filter elements, not only improves filtration accuracy and efficiency but also significantly reduces the probability of filter element clogging and extends the filter element replacement cycle. Preferably, the device can be equipped with pressure monitors on the inlet pipes of the second filter element assembly 12 and the third filter element assembly 13 respectively. When the pressure in the pipe exceeds the preset value, it will promptly prompt the staff to replace the corresponding filter element, avoiding the impact of excessive filter element clogging on the filtration effect and the safe operation of the device.

[0031] Example 3

[0032] This embodiment is based on the foregoing embodiments. In this embodiment, as follows: Figure 1 As shown, the outlet end of the coalescing filter element 31 is connected to one end of the return pipe 33, and the other end of the return pipe 33 is connected to the inlet end of the coalescing filter element 31. The return pipe 33 is used to transport the oil that fails to meet the separation standards to the coalescing filter element 31 for further filtration and separation.

[0033] In this embodiment, the oil is filtered stage by stage through a multi-stage filter assembly and cooled by the cooling mechanism 2 before entering the coalescing filter 31 for oil-water separation. After separation, the oil at the outlet of the coalescing filter 31 is tested. If the oil separation meets the standards, it is output normally. If the oil separation does not meet the standards, such as a high water content, the substandard oil is transported to the inlet of the coalescing filter 31 through the return pipe 33, allowing it to re-enter the coalescing filter 31 for filtration and separation. During this process, since the multi-stage filter assembly has removed most of the solid impurities, the pores of the coalescing filter 31 are relatively large. Impurities in the re-entering substandard oil will not clog the coalescing filter 31. The coalescing filter 31 can continue to stably adsorb water droplets and promote oil-water separation until the oil separation meets the standards and is output normally. The separated water is collected by the collection device 32. The reflux structure enables secondary processing of substandard oil products, avoiding resource waste and quality problems caused by direct discharge of substandard oil products, and significantly improving the pass rate of oil separation. Preferably, a control valve 5 and an oil detection sensor are installed on the reflux pipe 33. The sensor monitors the oil separation status at the outlet of the coalescing filter element 31 in real time. When substandard products are detected, the control valve 5 automatically opens, refluxing the substandard oil products back to the inlet of the coalescing filter element 31 without manual intervention, thus improving the automation level of the device operation. Specific automated control equipment can be directly applied to the device of this invention based on conventional equipment in this technical field, and will not be elaborated further here. The specific model of the oil detection sensor can be:

[0034] Yatai Optoelectronics YB2 online oil moisture sensor and Vaisala MMP8 oil moisture sensor.

[0035] Example 4

[0036] This embodiment is based on the foregoing embodiments. In this embodiment, as follows: Figure 1 As shown, the outlet end of the coalescing filter element 31 is connected to one end of the return pipe 33, and the other end of the return pipe 33 is connected to the inlet end of the cooling mechanism 2. The return pipe 33 is used to transport the substandard oil to the cooling mechanism 2 to adjust the temperature before entering the coalescing filter element 31 for further filtration and separation.

[0037] In this embodiment, the anti-clogging oil filtration and separation device connects the other end of the return pipe 33 to the inlet end of the cooling mechanism 2, instead of the inlet end of the coalescing filter element 31 in embodiment 3. During operation, the oil enters the cooling mechanism 2 for cooling after being filtered by the multi-stage filter element assembly, and then enters the coalescing filter element 31 for oil-water separation. The oil at the outlet of the coalescing filter element 31 is tested. If the separation meets the standard, it is output normally, and the separated water is collected by the collection device 32. If the oil separation does not meet the standard, it means that the oil may have experienced temperature fluctuations after the first cooling, or the temperature was not fully adapted to the requirements of the coalescing filter element 31 during the first separation, resulting in poor separation effect. At this time, the substandard oil is transported to the inlet end of the cooling mechanism 2 through the return pipe 33, and enters the cooling mechanism 2 together with the oil just output from the multi-stage filter element assembly. It is cooled down to the temperature required by the coalescing filter element 31 again, and then enters the coalescing filter element 31 for secondary filtration and separation. Compared to direct reflux to the inlet of coalescing filter element 31, this structural design ensures that the oil is at a suitable temperature during secondary separation, avoiding the impact of unsuitable temperature on the separation effect of coalescing filter element 31, further improving the success rate of secondary separation and ensuring the quality of the output oil.

[0038] Example 5

[0039] This embodiment is based on the previous embodiment. In this embodiment, the cooling mechanism 2 includes a cooling water tank and a heat exchange coil. The heat exchange coil is installed in the cooling water tank. The two ends of the heat exchange coil are respectively connected to the outlet end of the multi-stage filter element assembly and the inlet end of the coalescing filter element 31. The heat exchange coil is used to transfer the heat of the oil to the cooling water in the cooling water tank through contact heat transfer.

[0040] In this embodiment, during operation, the oil, filtered through multiple stages of the filter assembly, enters the heat exchange coil. Since the heat exchange coil is immersed in the cooling water in the cooling water tank, the oil flows within the coil, and heat transfer occurs through contact between the coil wall and the cooling water. The heat from the oil is gradually transferred to the cooling water, causing the oil temperature to slowly decrease to the temperature range required by the coalescing filter element 31. This contact heat transfer method ensures uniform oil cooling, avoiding excessively rapid local cooling or temperatures not meeting the target. Furthermore, the cooling water in the cooling water tank continuously provides a cold source for the heat exchange, ensuring stable cooling performance. After cooling, the oil flows out of the heat exchange coil and enters the coalescing filter element 31 for oil-water separation. The separated water is collected by the collection device 32. Throughout the process, the stable cooling effect provides a crucial guarantee for the efficient separation function of the coalescing filter element 31. Simultaneously, the filtration by the previous multi-stage filter assembly effectively prevents clogging of the coalescing filter element 31. In this embodiment, the heated cooling water can also be cooled by air cooling to ensure the continuous operation of the cooling water. The specific structural settings of the cooling water tank and heat exchange coil can be directly selected and applied to this utility model based on the structure of the existing water-cooled heat exchange device, and will not be described in detail here.

[0041] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. An anti-clogging oil filtering and separating device, characterized by, It includes a filtration mechanism, a cooling mechanism, and a separation mechanism, wherein the cooling mechanism is connected between the filtration mechanism and the separation mechanism; The filtration mechanism is provided with a multi-stage filter element assembly, the outlet end of which is connected to the inlet end of the cooling mechanism. The separation mechanism is provided with a coalescing filter element for separating oil and water, the inlet end of which is connected to the outlet end of the cooling mechanism. The outlet end of the coalescing filter element is connected to a collection device for collecting the separated water. The filter element with a pore size at the outlet end of the multi-stage filter element assembly is smaller than the pore size of the coalescing filter element. The multi-stage filter assembly is used to filter oil step by step through multiple sets of filter elements with progressively increasing filtration accuracy. The cooling mechanism is used to cool the oil delivered by the multi-stage filter assembly to the temperature required by the coalescing filter element.

2. The clogging-preventing oil filtering and separating device according to claim 1, characterized in that, The multi-stage filter assembly includes a first filter assembly, a second filter assembly, and a third filter assembly connected in sequence. The third filter assembly is provided with a pleated filter element, and at least two sets of the pleated filter elements are arranged in parallel.

3. The clogging-preventing oil filtering and separating device according to claim 2, wherein The first filter element assembly is provided with a rod-type filter element, and the second filter element assembly is provided with a bag-type filter element, wherein at least two sets of the bag-type filter elements are arranged in parallel.

4. The clogging-preventing oil filtering and separating device according to claim 1, characterized in that, The outlet end of the coalescing filter element is connected to one end of a return pipe, and the other end of the return pipe is connected to the inlet end of the coalescing filter element. The return pipe is used to transport substandard oil products to the coalescing filter element for further filtration and separation.

5. The clogging-preventing oil filtering and separating device according to claim 1, characterized in that, The outlet end of the coalescing filter element is connected to one end of a return pipe, and the other end of the return pipe is connected to the inlet end of the cooling mechanism. The return pipe is used to transport substandard oil products to the cooling mechanism to adjust the temperature before they enter the coalescing filter element for further filtration and separation.

6. The clogging-preventing oil filtering and separating device according to claim 1, characterized in that, The cooling mechanism includes a cooling water tank and a heat exchange coil. The heat exchange coil is installed inside the cooling water tank, and its two ends are respectively connected to the outlet end of the multi-stage filter element assembly and the inlet end of the coalescing filter element. The heat exchange coil is used to transfer the heat of the oil to the cooling water in the cooling water tank through contact heat transfer.

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