A filtration device with a filter cloth-less filter element

Abstract

This utility model relates to the field of filtration technology, solving the problems of high usage and disposal costs associated with filter cloth filters. Specifically, it discloses a filtration device with a cloth-free filter element, including a filter barrel and a filter element. The filter element is disposed inside the filter barrel and includes a filter shell and a central rod disposed inside the filter shell. A filter end cap is detachably connected to the end of the filter shell, and the end cap has a central hole. The end of the central rod passes through the central hole and connects to the filter end cap. The end of the central rod is detachably connected to the filter barrel. The space between the inner wall of the filter shell and the central rod forms a filtration chamber, which is filled with filter material. The filter shell and the central rod allow the material to be filtered to pass sequentially from the outside of the filter shell into the filtration chamber and then into the central rod through filtration gaps on their surfaces. This utility model is used in oil filtration devices, featuring a cloth-free filter element that can be repeatedly recycled, saving costs.

Description

Technical Field

[0001] This utility model relates to the field of waste oil filtration technology, and in particular to a filtration device with a filter element without filter cloth. Background Technology

[0002] Currently, filter cartridges used in waste oil filtration devices typically form filter bags using filter cloth as a container for particulate matter. However, filter cloth is difficult to recycle in waste oil filtration scenarios, mainly due to limitations imposed by its material properties and contamination adhesion mechanisms. During filtration, particles can become embedded in the fiber gaps or deposit deep within the filter cloth. Even with washing attempts, the mechanical compression of rigid particles can cause fiber deformation, pore enlargement, or closure, compromising the original filtration accuracy. Repeated exposure to the impact of flowing waste oil or mechanical agitation during washing can also lead to fiber breakage or loosening of interlacing points, resulting in filter cloth damage and leakage. Furthermore, issues such as chemical corrosion and microbial contamination can prevent the filter cloth from being recycled. Therefore, in highly polluted scenarios such as industrial waste oil, filter cartridges are usually only used as disposable consumables. This not only involves cumbersome manufacturing and increased operating costs, but also requires further harmless treatment of discarded filter cartridges, making the processing technology quite complex. Utility Model Content

[0003] To address the problems of high operating and disposal costs associated with the use of filter cloth in existing waste oil filtration devices, this invention provides a filtration device with a filter cloth-free filter element.

[0004] The technical solution adopted in this utility model is:

[0005] A filtration device with a filter cloth-free filter element includes a filter barrel and a filter element. The filter element is disposed inside the filter barrel. The filter element includes a filter element shell and a central rod disposed inside the filter element shell. A filter element end cap is detachably connected to the end of the filter element shell. A central hole is provided on the filter element end cap. The end of the central rod passes through the central hole and is connected to the filter element end cap. The end of the central rod is detachably connected to the filter barrel.

[0006] The space between the inner wall of the filter element housing and the central rod forms a filter cavity, which is used to fill filter material. The filter element housing and the central rod are used to allow the object to be filtered to pass from the outside of the filter element housing into the filter cavity and then into the central rod through the filter gaps set on their surfaces.

[0007] Furthermore, the detachable connection between the filter element end cap and the filter element housing is a threaded connection, and an end cap locking mechanism is provided between the end of the central rod and the filter element end cap. The end cap locking mechanism is used to fix the relative position between the filter element housing and the filter element end cap by applying pressure to the filter element end cap.

[0008] Furthermore, a filter element locking mechanism is provided between the end of the central rod and the filter barrel. The filter element locking mechanism is located at the bottom of the filter barrel and is used to fix the relative position between the filter element and the filter barrel by applying pressure.

[0009] Furthermore, both the filter element housing and the central rod are made of metal material, and the surfaces of the filter element housing and the central rod are provided with spirally wound metal strips or multiple arranged annular metal rings, and the winding intervals of the metal strips or the arrangement intervals of the annular metal rings form metal filter slots.

[0010] Furthermore, the filter barrel includes a filter barrel outer shell and a filter barrel inner shell disposed inside the filter barrel outer shell. The filter barrel inner shell covers the outer periphery of the filter element. The top surface of the filter barrel inner shell has an open structure. A lower partition is provided at the top plane of the filter barrel inner shell. The lower partition is provided with a partition hole for cooperating with the outer side wall of the filter barrel inner shell.

[0011] The lower partition is used to form an independent filtration zone between each filter element and the inner shell of the filter cartridge by cooperating with the inner shell of the filter cartridge.

[0012] Furthermore, the top of the filter cartridge shell is connected to a shell end cap, and the bottom surface of the shell end cap is provided with an upper partition plate. The upper partition plate is located above the filter element and the inner shell of the filter cartridge and forms a buffer oil tank between it and the lower partition plate. The upper partition plate is used to separate the space inside the shell end cap from the space inside the filter cartridge shell.

[0013] Furthermore, the top of the filter cartridge shell is connected to a shell end cap, and an air pipe is connected to the shell end cap. One end of the air pipe inside the filter cartridge shell is connected to the space above the lower partition. The air pipe is used to connect to an external air supply device and to pressurize the inside of the filter cartridge mechanism.

[0014] Furthermore, the bottom end of the central rod is connected to an oil outlet pipe located at the bottom of the filter barrel, and the oil outlet pipe is in communication with the interior of the central rod; the oil outlet pipe is used to discharge the filtered oil from the filter element.

[0015] Furthermore, the filter barrel is connected to an oil inlet pipe, and a heating element for heating the raw material oil is installed on the oil inlet pipe. A temperature detection probe for detecting the oil temperature is also installed inside the filter barrel shell.

[0016] The beneficial effects of this utility model are:

[0017] This utility model's filtration device features a filter element without a filter cloth. Instead of using a filter cloth to form a filter bag to hold the filter material, the existing technology uses a filter element shell to directly hold the filter material. Removable end caps are provided at both ends of the filter element shell. Simultaneously, a central rod inside the filter element shell extends out of the end caps and is detachably connected to the filter cartridge. When the filtration effect deteriorates after a period of use, the removable end caps can be opened to drain the existing filter material and refill it with new filter material. The end caps can then be reinstalled to continue operation, allowing the filter element to regain its initial filtration effect and enabling its recycling. This filtration device eliminates the filter cloth structure, eliminating the need to replace the filter element itself during use. Recycling is achieved simply by cleaning the inside of the filter element. It is simple to operate, lower in cost, and unaffected by filter cloth deformation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly structure of the filter barrel and filter element of this utility model;

[0019] Figure 2 This is a schematic diagram of the filter element structure of this utility model;

[0020] Figure 3 for Figure 2 Top view;

[0021] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0022] Figure 5 This is an exploded view of the filter element structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of the filter barrel with an inner shell according to the present invention.

[0024] Figure 7 This is a top view of the lower partition and filter element of this utility model.

[0025] Figure label:

[0026] 1-Filter barrel, 2-Filter element shell, 3-Center rod, 4-Filter element end cap, 5-Filter chamber, 6-End cap locking mechanism, 7-Filter element locking mechanism, 8-Annular metal ring, 9-Filter barrel shell, 10-Filter barrel inner shell, 11-Lower partition, 12-Separation hole, 13-Shell end cap, 14-Upper partition, 15-Buffer oil tank, 16-Air pipe, 17-Oil outlet pipe, 18-Heating element, 19-Temperature detection probe, 20-Oil inlet pipe. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Example 1

[0029] This embodiment is a filtration device with a filter element without a filter cloth, such as... Figures 1-5 As shown, the system includes a filter cartridge 1 and a filter element. The filter element is disposed inside the filter cartridge 1 and includes a filter cartridge housing 2 and a central rod 3 disposed inside the filter cartridge housing 2. A filter cartridge end cap 4 is detachably connected to the end of the filter cartridge housing 2. The filter cartridge end cap 4 is provided with a central hole. The end of the central rod 3 passes through the central hole and is connected to the filter cartridge end cap 4. The end of the central rod 3 is detachably connected to the filter cartridge 1. The space between the inner wall of the filter cartridge housing 2 and the central rod 3 forms a filter chamber 5, which is used to fill filter material. The filter cartridge housing 2 and the central rod 3 are used to allow the object to be filtered to pass from the outside of the filter cartridge housing 2 into the inside of the filter chamber 5 and the inside of the central rod 3 in sequence through the filter gaps provided on the surface.

[0030] For the detachable connection between the filter element housing 2 and the filter element end cap 4 in this embodiment, a specific detachable connection structure can be set as needed so that there is no leakage between the filter element end cap 4 and the filter element housing 2 after installation and closure. For example, internal and external threads that can cooperate with each other are provided on the filter element housing 2 and the filter element end cap 4, respectively. The filter element end cap 4 is rotated and tightened onto the end of the filter element housing 2 through the threaded connection. To ensure the sealing effect, sealing gaskets and other components can be set at the connection to prevent leakage at the threaded connection. When disassembly is required, the filter element end cap 4 can be opened by rotating the thread. In addition, the detachable connection structure of the filter element end cap 4 can also be achieved through the connection of the central rod 3. Since the end of the central rod 3 passes through the central hole and connects to the filter element end cap 4, a locking mechanism acting on the filter element end cap 4 can be set between the central rod 3 and the filter element end cap 4 to lock the filter element end cap 4 onto the filter element housing 2 to achieve closed installation. When disassembly is required, the locking mechanism on the central rod 3 can be released to remove the filter element end cap 4. The specific structure of the locking mechanism will be further described in the following embodiments and will not be repeated here. The two detachable structures mentioned above can be applied separately to the filter element or can be installed on the filter element at the same time. When the two detachable structures are installed at the same time, the pressure of the locking mechanism on the filter element end cover 4 can prevent the threaded connection between the filter element end cover 4 and the filter element housing 2 from loosening, and lock the relative position between the two parts, thereby further improving the sealing effect. When disassembling, first loosen the locking mechanism, then rotate the filter element end cover 4 and remove it.

[0031] For the detachable connection between the end of the central rod 3 and the filter barrel 1 in this embodiment, a thread can be provided on the end of the central rod 3 connected to the filter barrel 1, and a locking nut head with thread engagement can be connected to the part of the central rod 3 that protrudes out of the filter barrel 1, thereby fixing the central rod 3 to the filter barrel 1.

[0032] Based on the above structure, the filtration device of this utility model can be implemented as follows according to the working conditions:

[0033] When the filter device has been working for a certain period of time, the staff finds that the filtration effect has deteriorated, the pressure has increased abnormally, or the filtration efficiency has decreased. If the maintenance inspection finds that the filter element needs to be cleaned, the filter canister 1 can be opened and the filter element end cap 4 on the top of each filter element can be removed. The filter canister 1 can be flipped over with auxiliary equipment to discharge the filter material in the filter element shell 2. To help the filter material be discharged more thoroughly, a vibration mechanism can be set to apply vibration to the filter canister 1 to discharge all the filter material residue through vibration. After cleaning, new filter material or cleaned filter material can be filled into the filter element shell 2. After closing the filter element end cap 4, the device can be run again to complete the intermediate maintenance process of cyclic use.

[0034] When the filter device is not easy to flip, or when some of the filter elements are faulty and need to be handled separately, the filter elements can be disassembled by using the detachable connection between the end of the central rod 3 and the filter bucket 1. Then, the cleaning or maintenance work after opening the filter element end cover 4 can be performed. For example, after rotating and removing the nut head connected to the bottom of the central rod 3, the specified filter element can be taken out from the inside of the filter bucket 1 for maintenance. After maintenance, the filter element can be put back into the filter bucket 1 and the nut head can be locked. This allows the filter elements to be processed and reused without the filter bucket 1, which is more convenient to operate.

[0035] In this embodiment, the filter element of the filtration device has removed the filter cloth structure. During use, there is no need to replace the filter element body. It can be recycled simply by cleaning the inside of the filter element. It is simple to operate, has lower cost, and will not be affected by problems such as filter cloth deformation.

[0036] Example 2

[0037] Based on the foregoing embodiments, such as Figure 4 , Figure 5 As shown, in this embodiment, the detachable connection between the filter element end cap 4 and the filter element housing 2 is a threaded connection. An end cap locking mechanism 6 is provided between the end of the central rod 3 and the filter element end cap 4. The end cap locking mechanism 6 is used to fix the relative position between the filter element housing 2 and the filter element end cap 4 by applying pressure to the filter element end cap 4. In a preferred embodiment, a filter element locking mechanism 7 is provided between the end of the central rod 3 and the filter barrel 1. The filter element locking mechanism 7 is located at the bottom of the filter barrel 1 and is used to fix the relative position between the filter element and the filter barrel 1 by applying pressure to the filter barrel 1.

[0038] This embodiment is a further implementation of the detachable connection between the filter element end cap 4 and the filter element housing 2. Based on the implementation of embodiment 1, the end cap locking mechanism 6 is further specifically configured. To facilitate the unified production and assembly of components, a filter element end cap 4 can be provided at each end of the filter element housing 2. Both filter element end caps 4 are configured to be detachably connected. Thus, during installation, it is not necessary to deliberately distinguish between the top and bottom ends of the filter element itself. It is only necessary to distinguish the installation methods at both ends of the filter element. That is, the end cap locking mechanism 6 and the filter element locking mechanism 7 use the same components to form different installation structures.

[0039] Specifically, the end cap locking mechanism 6 can be set up using the detachable filter element locking mechanism 7 between the central rod 3 and the filter barrel 1 as in Embodiment 1. In this embodiment, threads are opened on both ends of the central rod 3. During installation, the filter element end cap 4 at the end of the filter element connected to the filter barrel 1 is located inside the filter barrel 1, while the nut head is threaded from the outside of the filter barrel 1 to the end of the central rod 3 and locked to the bottom outside the filter barrel 1. At this time, due to the connection and locking between the nut head and the central rod 3, there is mutual pressure between the filter element end cap 4 at the connection end and the inner wall of the filter barrel 1, thereby achieving the locking effect through pressure. The other end of the filter element locks the nut head to the filter element end cap 4, realizing the installation of the filter element in the filter barrel 1 by using the same detachable connector through different installation methods.

[0040] The detachable connection in this embodiment further reduces the number of different parts in the filter element of the present invention, reduces design complexity, simplifies the manufacturing of the filter element, and allows for installation by using different installation methods for the components at both ends of the filter element. This avoids the problem of needing to remove and reinstall the filter element if it is installed upside down, further simplifying the disassembly and assembly steps and making it more convenient to use.

[0041] Example 3

[0042] Based on the aforementioned embodiments, to ensure that the filter element is more wear-resistant during long-term cyclic use when friction occurs between it and the filter material particles, and more corrosion-resistant during long-term contact with filtered substances such as oil, in this embodiment both the filter element housing 2 and the central rod 3 are made of metal materials, such as wear-resistant stainless steel. Figure 2 , Figure 5As shown, spirally wound metal strips or multiple arranged annular metal rings 8 are provided on the surfaces of the filter element housing 2 and the central rod 3. The spacing between the winding of the metal strips or the spacing between the arrangement of the annular metal rings 8 form metal filter slots. In the working process of this embodiment, the filter element, such as oil, enters the internal filter chamber 5 through the metal filter slots formed on the surface of the filter element housing 2. After being filtered by the internal filter material, it enters the interior of the central rod 3 through the metal filter slots on the central rod 3 and is then transported out of the filter bucket 1 through the connected finished product pipeline. During the cleaning of the filter element in the circulation process, the filter element housing 2 and the central rod 3, made of metal materials, are more wear-resistant and vibration-resistant during the cleaning of filter material particles, and are less prone to wear and cracking, resulting in a longer service life of the filter element.

[0043] Example 4

[0044] Based on the foregoing embodiments, such as Figure 6 , Figure 7 As shown, in this embodiment, the filter cartridge 1 includes a filter cartridge outer shell 9 and a filter cartridge inner shell 10 disposed inside the filter cartridge outer shell 9. The filter cartridge inner shell 10 covers the outer periphery of the filter element. The top surface of the filter cartridge inner shell 10 is an open structure. A lower partition 11 is provided at the plane where the top of the filter cartridge inner shell 10 is located. The lower partition 11 has a partition hole 12 for cooperating with the outer side wall of the filter cartridge inner shell 10. The lower partition 11 is used to form an independent filtration zone between each filter element and the filter cartridge inner shell 10 by cooperating with the filter cartridge inner shell 10.

[0045] In this embodiment, the filter barrel 1 consists of a filter barrel outer shell 9 and an inner filter barrel shell 10. Compared with the prior art, which directly uses the filter barrel outer shell 9 to contain the raw oil, the mechanism of this utility model uses the filter barrel inner shell 10 to contain the raw oil as the filtration space. The space between multiple filter barrel inner shells 10 is separated by an upper partition 14, so that the filter element in each filter barrel inner shell 10 is located in its own independent filtration zone. When the raw oil enters above the upper partition plate through the oil inlet pipe, the raw oil falls into the filter element and the filter barrel inner shell 10 through the partition hole 12 opened on the upper partition plate. The filtration space between the filter elements and the inner shell 10 is further filtered by filter cartridges under the influence of gravity and oil pressure. This filter cartridge structure ensures that when contamination occurs in the independent filtration zones between the filter cartridges and the inner shell 10, these zones are isolated from each other. Due to gravity and oil pressure, the contaminated raw oil will not flow back upwards to the partition plate, allowing only the contaminated area to be treated. The raw oil and filter cartridges in other areas can continue to be used, significantly saving resources and extending the service life of equipment components. This structure compresses the internal space of the filter cartridge 1 through its partitioned filter cartridge structure, reducing the gaps. The required oil filling volume inside the filter cartridge 1 is less than 30L, and the operating pressure of the equipment is significantly reduced to within 0.1MPa. With the reduced pressure, all the oil inside the filter cartridge 1 can be filtered and discharged under pressure, leaving no excess oil residue or storage, and preventing the mixing of oils from different batches.

[0046] As a preferred implementation method, such as Figure 6 As shown, a housing head 13 is connected to the top of the filter housing 9. An upper baffle 14 is provided on the bottom surface of the housing head 13. The upper baffle 14 is positioned above the filter element and the inner shell 10 of the filter housing, forming a buffer oil tank 15 between it and the lower baffle 11. The upper baffle 14 separates the space inside the housing head 13 from the space inside the filter housing 9. The upper baffle 14 seals the interior of the housing head 13, limiting the maximum liquid level of the raw oil inside the filter housing 1 to below the housing head 13. The raw oil entering the filter housing 9 through the inlet pipe is pre-buried in the buffer oil tank 15 space between the lower baffle 11 and the upper baffle 14 before entering the space between the inner shell 10 and the filter element, thus preventing excessive local oil pressure. Separating the housing head 13 from the raw oil prevents corrosion from contact with the housing head 13, thereby reducing maintenance frequency and extending component lifespan.

[0047] As a preferred implementation method, such as Figure 6As shown, an air pipe 16 is connected to the outer casing 13. One end of the air pipe 16, located inside the filter housing 9, connects to the space above the lower partition 11. The air pipe 16 is used to connect to an external air supply device and pressurize the interior of the filter housing 1. When the filtration process is about to end, after all the remaining raw oil to be processed has been fed into the filter housing 1, the original oil pressure cannot be maintained due to the discontinuity of the liquid. The raw oil cannot pass through the filter element normally by gravity alone. In this case, the air supply device is turned on to pressurize the interior of the filter housing 9 through the air pipe 16, thereby pressurizing and filtering the remaining raw oil, ensuring that all the remaining raw oil is processed and improving the utilization rate of the raw materials.

[0048] Example 5

[0049] Based on the foregoing embodiments, such as Figure 6 As shown, to facilitate the unified collection of filtered product oil, in this embodiment, the bottom end of the central rod 3 is connected to an oil outlet pipe 17 located at the bottom of the filter barrel 1, and the oil outlet pipe 17 is connected to the interior of the central rod 3; the oil outlet pipe 17 is used to discharge the filtered oil from the filter element. The filtered clean product oil can be discharged downwards through the bottom oil outlet pipe 17 under pressure and gravity for unified collection. To ensure the cleanliness of the filtered oil and avoid contamination by unfiltered oil inside, each assembly part of the filter element can adopt a corresponding sealing connection structure to ensure sealing, thereby ensuring the filtration effect. The specific sealing structure can be achieved by using gaskets, sealing rings, or other components at the connection points of each part. Those skilled in the art can select from existing conventional sealing components.

[0050] As a preferred embodiment, to reduce the viscosity of the raw oil and improve its fluidity, thereby increasing the filtration efficiency of the filter barrel 1 mechanism, such as... Figure 6As shown, the filter barrel 1 is connected to an oil inlet pipe 20, and a heating element 18 for heating the raw oil is installed on the oil inlet pipe 20. This heating element 18 can be configured as a pipeline heating system covering the oil inlet pipe 20, uniformly heating this section of the oil inlet pipe 20 and the raw oil flowing inside. A temperature detection probe 19 for detecting the oil temperature is also installed inside the filter barrel shell 9. The temperature detection probe 19 is equipped with a temperature sensor for collecting the internal temperature of the filter barrel shell 9. The temperature sensor transmits the collected temperature information via wired or wireless connection and displays the temperature information through an instrument or display panel, allowing operators to observe the internal temperature of the filter barrel 1 and thus understand the temperature parameters for filtration. The pipeline heating system is faster and more efficient, heating the oil uniformly. Compared with existing technologies, it reduces the space required for the filter barrel, increases the effective filtration area of ​​the filter element, and ensures filtration speed and effect. Preferably, the external heating element 18 can be equipped with an electric heating wire as a heat source to provide heat energy to heat the raw oil in the oil inlet pipe 20, thereby adjusting the heating temperature according to parameters such as the energized current.

[0051] Preferably, the temperature sensor used on the temperature detection probe 19 can be of the following model:

[0052] D0832 general-purpose hydraulic oil temperature sensor, YV6 multi-function sensor or 7861-93-3320 temperature sensor.

[0053] 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. A filtration device with a filter cloth-less filter element, characterized in that, The filter includes a filter cartridge and a filter element. The filter element is disposed inside the filter cartridge. The filter element includes a filter element shell and a central rod disposed inside the filter element shell. A filter element end cap is detachably connected to the end of the filter element shell. A central hole is provided on the filter element end cap. The end of the central rod passes through the central hole and is connected to the filter element end cap. The end of the central rod is detachably connected to the filter cartridge. The space between the inner wall of the filter element housing and the central rod forms a filter cavity, which is used to fill filter material. The filter element housing and the central rod are used to allow the object to be filtered to pass from the outside of the filter element housing into the filter cavity and then into the central rod through the filter gaps set on their surfaces.

2. The filter device having a filter cartridge without filter cloth according to claim 1, characterized in that The detachable connection between the filter element end cap and the filter element housing is a threaded connection. An end cap locking mechanism is provided between the end of the center rod and the filter element end cap. The end cap locking mechanism is used to fix the relative position between the filter element housing and the filter element end cap by applying pressure to the filter element end cap.

3. The filter apparatus having a filter cartridge without filter cloth according to claim 1, wherein, A filter element locking mechanism is provided between the end of the central rod and the filter barrel. The filter element locking mechanism is located at the bottom of the filter barrel and is used to fix the relative position between the filter element and the filter barrel by applying pressure.

4. The filter apparatus having a filter cartridge without filter cloth according to claim 1, wherein, Both the filter element housing and the central rod are made of metal. The surfaces of the filter element housing and the central rod are provided with spirally wound metal strips or multiple arranged annular metal rings. The winding intervals of the metal strips or the arrangement intervals of the annular metal rings form metal filter slots.

5. The filter apparatus having a filter cartridge without filter cloth according to claim 1, wherein, The filter barrel includes a filter barrel outer shell and a filter barrel inner shell disposed inside the filter barrel outer shell. The filter barrel inner shell covers the outer periphery of the filter element. The top surface of the filter barrel inner shell has an open structure. A lower partition is provided at the top plane of the filter barrel inner shell. The lower partition is provided with a partition hole for cooperating with the outer side wall of the filter barrel inner shell. The lower partition is used to form a filtration partition between each filter element and the inner shell of the filter cartridge by cooperating with the inner shell of the filter cartridge.

6. The filter apparatus having a filter cartridge without filter cloth according to claim 5, wherein, The top of the filter cartridge shell is connected to a shell end cap, and the bottom surface of the shell end cap is provided with an upper partition plate. The upper partition plate is located above the filter element and the inner shell of the filter cartridge and forms a buffer oil tank between it and the lower partition plate. The upper partition plate is used to separate the space inside the shell end cap from the space inside the filter cartridge shell.

7. The filter apparatus having a filter cartridge without filter cloth according to claim 5, wherein The top of the filter barrel shell is connected to a shell end cap, and an air pipe is connected to the shell end cap. One end of the air pipe inside the filter barrel shell is connected to the space above the lower partition. The air pipe is used to connect to an external air supply device and to pressurize the inside of the filter barrel mechanism.

8. The filter apparatus having a filter cartridge without filter cloth according to claim 1, wherein, The bottom end of the central rod is connected to an oil outlet pipe located at the bottom of the filter barrel, and the oil outlet pipe is connected to the inside of the central rod; the oil outlet pipe is used to discharge the filtered oil from the filter element.

9. The filter apparatus having a filter cartridge without filter cloth according to claim 1, wherein, The filter barrel is connected to an oil inlet pipe, and a heating element for heating the raw oil is installed on the oil inlet pipe. A temperature detection probe for detecting the oil temperature is also installed inside the filter barrel shell.

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