A grease precision filtering device
By using 45nm to 50nm PP filters for pressurized filtration during the edible oil filtration process, the existing bag filters are solved, and efficient and stable oil and grease filtration is achieved, reducing production costs.
Patent Information
- Application Number
- CN202421297591.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-06
AI Technical Summary
During the edible oil filtration process, the mesh bags are prone to deform and perforated, affecting the filtration accuracy and efficiency, and are frequently maintained, increasing production costs.
Using a PP filter element with a filter accuracy of 45nm to 50nm, filtering by pressurization can effectively remove nano-level impurities, waxes, and gums in grease, and has stable and efficient filtration accuracy and long maintenance cycle.
High-precision grease filtration is achieved, reducing maintenance frequency and production costs, improving production efficiency, and the filter element can be cleaned and reused.
Smart Images
Figure CN222694163U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of grease production, in particular to a grease precision filtering device. Background Art
[0002] Edible oil, also known as cooking oil, refers to animal or vegetable fats used in the process of making food, which is liquid at room temperature. In the production process of edible oil, in order to improve the quality of edible oil, fine filtration is required. Currently, fine filtration of edible oil is carried out through bag filters.
[0003] During the long-term use of bag filters, the inventors found that the mesh bags of bag filters would deform, affecting the filtering accuracy and even causing holes, affecting normal filtration. Not only was manpower required to monitor and maintain the condition of the bag filters, but also the replacement of filter bags required stopping the filtration step. Frequent replacement of filter bags affected production efficiency, which generally led to increased production costs. Utility Model Content
[0004] Based on this, the purpose of the utility model is to provide a grease precision filtering device, which adopts a PP filter element with a filtration accuracy of 45nm to 50nm, and performs filtration under pressure. It can filter out nano-scale impurities, waxes, and colloids in the grease, and has good filtration accuracy stability, a long maintenance cycle, and can be reused after cleaning.
[0005] A grease precision filtering device comprises a housing, an oil injection pump, a PP filter element and a first oil outlet valve; the housing comprises a housing cover, a housing wall and a housing bottom which are arranged in sequence from top to bottom, the housing cover is provided with an oil inlet hole, one end of the housing wall is detachably sealed with the housing cover, the other end of the housing wall is arranged along the outer circumference of the housing bottom and is sealed with the housing bottom, the housing bottom is provided with a first oil outlet hole, the housing cover, the housing wall and the housing bottom form a first accommodating space; the output end of the oil injection pump is sealed with the housing through a pipeline and communicates with the first accommodating space through the oil inlet hole; the PP filter element is located in the first accommodating space, the upper end of the PP filter element is sealed with the housing cover, the lower end of the PP filter element is fixed with the housing bottom, the upper end of the PP filter element is provided with a filter element hole, the oil inlet hole is communicated with the inner cavity of the filter element through the filter element hole, and the filtration accuracy of the PP filter element is 45nm to 50nm; the first oil outlet valve is fixed on the pipeline connected with the first oil outlet hole, and the first oil outlet valve is a pressure valve.
[0006] The grease precision filtering device described in the utility model adopts a PP filter element with a filtering accuracy of 45nm-50nm, and performs filtering in a pressurized manner, so that nano-scale impurities, waxes and colloids in the grease can be filtered out, and the filtering accuracy is stable, the maintenance cycle is long, and the grease can be reused after cleaning.
[0007] Furthermore, the PP filter element includes a skeleton and a PP fiber layer, the PP fiber layer is composed of PP fibers wound around the skeleton, and the diameter of the PP fibers is 9 μm to 11 μm. If the PP fiber diameter is less than 9 μm, the strength of the PP fiber layer is too small, and the structure is unstable when used under pressure. If the PP fiber diameter is greater than 11 μm, it is difficult to achieve a filtration accuracy of 45 nm to 50 nm.
[0008] Furthermore, the pore size of the PP fiber layer is arranged in a progressive step-like arrangement, and the pore size of the PP fiber layer gradually decreases from the inner cavity of the PP filter element to the outer side of the PP filter element. The progressive step-like arrangement is conducive to achieving a filtration accuracy of 45nm to 50nm and improving filtration efficiency.
[0009] Furthermore, the thickness of the PP fiber layer is 9 cm to 11 cm. If the thickness of the PP fiber layer is less than 9 cm, it is difficult to achieve a filtration accuracy of 45 to 50 nm, and if the thickness of the PP fiber layer is greater than 11 cm, the filtration efficiency is low.
[0010] Furthermore, it also includes a second oil outlet valve, the shell bottom is funnel-shaped, the shell bottom is also provided with a second oil outlet hole, the first oil outlet hole is located on the side of the funnel-shaped shell bottom, the second oil outlet hole is located at the bottom of the funnel-shaped shell bottom, and the second oil outlet valve is fixed on the pipeline connected to the second oil outlet hole. The commonly used first oil outlet hole is set on the side of the funnel-shaped shell bottom and used as a commonly used oil outlet hole, which is convenient for daily installation, maintenance and repair. On this basis, the second oil outlet is set at the bottom of the funnel-shaped shell bottom, and the oil in the shell can be drained when the grease batch or type is changed, which is convenient for distinguishing different batches of products, facilitating the tracing of product quality problems, and avoiding contamination between different types of oils.
[0011] Furthermore, a pressure gauge is included, the shell cover is also provided with a mounting hole, the pressure gauge is arranged through the mounting hole and is sealed and connected to the shell cover. The pressure gauge is arranged to detect the internal pressure of the shell to avoid danger caused by excessive pressure.
[0012] Furthermore, it also includes a support portion, which is located in the first accommodating space, and includes a support ring, a plurality of support strips and a lower limit portion, the bottom of the support ring abuts against the shell bottom, the outer wall of the support ring cooperates with the shell wall, and a plurality of the support strips are evenly distributed along the inner wall of the support ring, one end of the support strip is connected to the inner wall of the support ring, and the lower limit portion is fixed to the plurality of support strips, and the connection between the lower limit portion and the support strip is located between the two ends of the support strip, and the lower limit portion is provided with a lower limit hole, and the lower end of the PP filter element cooperates with the lower limit hole and abuts against the plurality of support strips. The support ring and the support strip are provided to support the lower end of the filter element, and the lower fiber ring is further provided to limit the filter element, so as to facilitate the installation of the filter element, improve the position stability of the filter element after installation, and enable the filter element to better cope with the working environment of pressurized filtration.
[0013] Furthermore, the support portion further includes a guide portion, the cross section of which is annular, the lower end of which is fixed to the upper end of the support ring, and the upper end surface of which is an inclined surface inclined from the outer side of the shell to the inner side of the shell. The guide portion is provided to guide the oil to the bottom of the shell, to avoid the oil from being retained on the upper end surface of the support ring, and to avoid mixing of different batches and different types of oil.
[0014] Furthermore, the support part further includes a reinforcing part, the reinforcing part is ring-shaped, the upper end of the reinforcing part is fixed to the lower end of the support ring, and the lower end of the reinforcing part is in contact with the shell bottom. The reinforcing part is provided to strengthen the supporting capacity of the support ring, so that the support part can better cope with the application scenario of pressure filtration.
[0015] Furthermore, it also includes a clamping part, which is located in the first accommodating space, and includes a pressing plate and an upper limit part. The bottom end of the pressing plate abuts against the upper end of the PP filter element, and the top end of the pressing plate abuts against the cover body. The pressing plate is provided with a pressing plate hole, and the pressing plate hole is connected with the filter element hole. The upper limit part is fixed to the lower end of the pressing plate, and the upper limit part is provided with an upper limit hole. The upper end of the PP filter element cooperates with the upper limit part and abuts against the pressing plate. The pressing plate clamps the PP filter element, and the upper limit part increases the position stability of the upper end of the PP filter element. The two work together to increase the airtightness between the filter element and the gland, making the device more suitable for pressurized filtration scenarios.
[0016] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic structural diagram of a grease precision filtering device according to an embodiment;
[0018] Figure 2This is a schematic structural diagram of a grease precision filtering device according to an embodiment;
[0019] Figure 3 This is a schematic structural diagram of a grease precision filtering device according to an embodiment;
[0020] Figure 4 This is a partial structural schematic diagram of a grease precision filtering device according to an embodiment;
[0021] Figure 5 is a schematic structural diagram of a support portion according to an embodiment;
[0022] Figure 6 This is a partial structural schematic diagram of a grease precision filtering device according to an embodiment;
[0023] Figure 7 This is a partial structural schematic diagram of a grease precision filtering device according to an embodiment;
[0024] Figure 8 This is a partial structural schematic diagram of a grease precision filtering device according to an embodiment;
[0025] Fig. 9 This is a schematic structural diagram of a pressing portion according to an embodiment;
[0026] Among them, the shell cover 11, the oil inlet hole 111, the shell wall 12, the shell bottom 13, the first oil outlet hole 131, the second oil outlet hole 132, the first accommodating space 14, the oil injection pump 2, the PP fiber layer 31, the upper cover 32, the filter element hole 321, the lower cover 33, the first oil outlet valve 4, the second oil outlet valve 5, the pressure gauge 6, the support ring 71, the support bar 72, the lower limit part 73, the guide part 74, the reinforcement part 75, the pressure plate 81, the pressure plate hole 811, and the upper limit part 82. DETAILED DESCRIPTION
[0027] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.
[0028] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0029] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0030] In addition, in the description of this application, unless otherwise specified, "multiple" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.
[0031] It should be understood that the embodiments of the present application are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present application is limited only by the appended claims.
[0032] The utility model embodiment is a grease precision filtering device, please refer to Figure 1, including a housing, an oil injection pump 2, an oil inlet pipe, a PP filter element, a first oil outlet pipe and a first oil outlet valve 4; the housing includes a housing cover 11, a housing wall 12 and a housing bottom 13 arranged in sequence from top to bottom, the housing cover 11 is provided with an oil inlet hole 111, one end of the housing wall 12 is detachably sealed and connected to the housing cover 11, the other end of the housing wall 12 is arranged along the outer periphery of the housing bottom 13 and is sealed and connected to the housing bottom 13, the housing bottom 13 is provided with a first oil outlet hole 131, the housing cover 11, the housing wall 12 and the housing bottom 13 form a first accommodating space 14; the input end of the oil injection pump 2 is connected to the oil inlet pipe One end of the oil inlet pipe is connected and communicated, the other end of the oil inlet pipe is connected to the oil tank storing the grease to be filtered, the output end of the oil injection pump 2 is connected and communicated with one end of the oil injection pipe, the other end of the oil injection pipe is sealed and connected to the shell and is arranged around the oil inlet hole 111, and the oil injection pipe is connected to the first accommodating space 14 through the oil inlet hole 111, so that the oil output from the output end of the oil injection pump 2 can pass through the oil injection pipe and the oil inlet hole 111 in sequence, and finally enter the first accommodating space 14. The oil injection pump 2 of the utility model embodiment adopts a piston pump; the PP filter element is located in the first accommodating space 14, the PP filter element includes a skeleton, a PP fiber layer 31, an upper cover 32 and a lower cover 33. The skeleton is cylindrical. In the present invention, the inner cavity of the skeleton is the inner cavity of the PP filter element. The PP fiber layer 31 is composed of PP fibers spirally wound on the outer side of the skeleton and compacted. The skeleton is located between the upper cover 32 and the lower cover 33. The lower end surface of the upper cover 32 is connected to the upper end surface of the skeleton and abuts against the upper end surface of the PP fiber layer 31. The upper end surface of the upper cover 32 is detachably sealed and connected to the shell cover 11. The upper cover 32 is provided with a filter element hole 321. The filter The core hole 321 is connected to the inner cavity of the PP filter element, the oil inlet hole 111 is connected to the filter element hole 321, the upper end surface of the lower cover 33 is fixed to the lower end surface of the skeleton and abuts against the lower end surface of the PP fiber layer 31, and the lower end surface of the lower cover 33 abuts against the raised portion located on the shell bottom 13. The filtration accuracy of the PP filter element is 45nm~50nm; one end of the first oil outlet pipe is sealed and connected to the shell bottom 13 and is arranged around the first oil outlet hole 131, and the other end of the first oil outlet pipe is connected and connected to one end of the first oil outlet valve 4, and the first oil outlet valve 4 is a pressure valve. The use process of the grease precision filtering device of the embodiment of the utility model is: turn on the oil injection pump 2, set the pressure of the oil injection pump 2 to 25Kg / ㎡, and the oil injection pump 2 injects the filtered oil into the inner cavity of the PP filter element from the oil inlet hole 111. After the inner cavity of the PP filter element is filled with oil, the oil injection pump 2 continues to inject oil to achieve pressurized filtration. Under the pressure generated by the continuous oil injection of the oil injection pump 2, the oil in the inner cavity of the PP filter element continuously penetrates into the space between the outside of the PP filter element and the inside of the shell, and the oil finally flowing out from the outside of the PP filter element is the precisely filtered oil. When the pressure of the precisely filtered oil reaches the preset opening value of the pressure valve, the pressure valve will automatically open to discharge the precisely filtered oil from the first accommodating space 14. In the embodiment of the utility model, the preset opening value of the pressure valve is 25Kg / ㎡.The grease precision filtering device of the embodiment of the utility model adopts a PP filter element with a filtering accuracy of 45nm to 50nm, and performs filtering in a pressurized manner, which can filter out nano-level impurities, waxes, and colloids in the grease, and has good filtering accuracy stability, a long maintenance cycle, and can be reused after cleaning.
[0033] In order to further ensure the stability of the filtration accuracy of the PP filter element, in one embodiment, the diameter of the PP fiber is 9μm~11μm. If the PP fiber diameter is less than 9μm, the strength of the PP fiber layer 31 is too small and the structure is unstable when used under pressure. If the PP fiber diameter is greater than 11μm, it is difficult to achieve a filtration accuracy of 45nm~50nm.
[0034] In order to improve the filtering efficiency of the PP filter element, in one embodiment, the pore size of the PP fiber layer 31 is arranged in a progressive step-like manner, and the pore size of the PP fiber layer 31 gradually decreases from the inner cavity of the PP filter element to the outer side of the PP filter element.
[0035] In order to improve the filtration efficiency while ensuring the filtration accuracy, in one embodiment, the thickness of the PP fiber layer 31 is 9 cm to 11 cm. If the thickness of the PP fiber layer 31 is less than 9 cm, it is difficult to achieve a filtration accuracy of 45 to 50 nm. If the thickness of the PP fiber layer 31 is greater than 11 cm, the filtration efficiency is low.
[0036] In order to improve the convenience of operation of the filtering device, in one embodiment, refer to Figure 2 The grease precision filtering device also includes a second oil outlet valve 5. The shell bottom 13 is funnel-shaped, and the first oil outlet hole 131 is located on the side of the funnel-shaped shell bottom 13. The shell bottom 13 is also provided with a second oil outlet hole 132. The second oil outlet hole 132 is located at the bottom of the funnel-shaped shell bottom 13. The second oil outlet valve 5 is fixed on the pipeline connected with the second oil outlet hole 132. If the oil outlet of the filtering device is directly set at the bottom of the shell, it will bring inconvenience to daily maintenance. Therefore, the embodiment of the utility model sets the commonly used first oil outlet hole 131 on the side of the funnel-shaped shell bottom 13 and uses it as a commonly used oil outlet hole, which is convenient for daily installation, maintenance and repair. On this basis, a second oil outlet for draining the internal oil is also set at the bottom of the funnel-shaped shell bottom 13. When the grease batch or type is changed, the oil in the shell can be drained, which is convenient for distinguishing different batches of products, and is conducive to tracing product quality problems, and can avoid contamination between different types of oil.
[0037] Since the filtration process needs to be pressurized, in order to improve the safety performance of the device, in one embodiment, please refer to Figure 3The grease precision filtering device also includes a pressure gauge 6. The shell cover 11 is also provided with a mounting hole. The pressure gauge 6 is arranged through the mounting hole and is sealed and connected to the shell cover 11. The pressure gauge 6 is arranged to detect the internal pressure of the shell. If the internal pressure of the shell is too high due to equipment failure or other reasons, the staff can find it in time through the reading of the pressure gauge 6, which can effectively avoid the situation where the internal pressure of the shell is too high, causing the PP filter element or even the production equipment to be damaged.
[0038] In order to improve the applicability of the filter device to the pressure filtration application scenario, in one embodiment, refer to Figure 4 and Figure 5 The grease precision filtering device also includes a support portion, which is located in the first accommodating space 14. The support portion includes a support ring 71, four support bars 72, and a lower limit portion 73. The bottom of the support ring 71 abuts against the shell bottom 13, and the outer wall of the support ring 71 cooperates with the shell wall 12. The four support bars 72 are evenly distributed along the inner wall of the support ring 71, and one end of the support bar 72 is connected to the inner wall of the support ring 71. The lower limit portion 73 is fixed to the four support bars 72. The connection between the lower limit portion 73 and the support bar 72 is located between the two ends of the support bar 72. The lower limit portion 73 is provided with a lower limit hole, and the lower cover 33 of the PP filter element cooperates with the lower limit hole and abuts against the four support bars 72. In other embodiments, the number of support bars 72 can be adjusted according to actual needs; a support ring 71 and support bars 72 are provided to support the lower end of the filter element, and a lower fiber ring is further provided to limit the filter element. On the one hand, it is convenient for the installation of the filter element, and on the other hand, it can improve the position stability of the filter element after installation, which is conducive to allowing the filter element to better cope with the working environment of pressurized filtration.
[0039] To further ensure that the filter device can drain the oil, in one embodiment, refer to Figure 6 The support portion further includes a guide portion 74, the cross section of which is annular, the lower end of which is fixed to the upper end of the support ring 71, and the upper end surface of which is an inclined surface inclined from the outer side of the shell to the inner side of the shell. The guide portion 74 is provided to guide the oil to the shell bottom 13, to prevent the oil from being retained on the upper end surface of the support ring 71, and to prevent the mixing of different batches and different types of oil.
[0040] In order to further improve the stability of the PP filter element position, in one embodiment, refer to Figure 7 The support part further includes a reinforcing part 75, which is annular, the upper end of the reinforcing part 75 is fixed to the lower end of the support ring 71, and the lower end of the reinforcing part 75 is in contact with the shell bottom 13. The reinforcing part 75 is provided to strengthen the supporting capacity of the support ring 71, so that the support part can better cope with the application scenario of adding filtration.
[0041] In order to further improve the stability of the PP filter element position, in one embodiment, refer to Figure 8 and Fig. 9 The grease precision filtering device also includes a pressing part, which is located in the first accommodating space 14. The pressing part includes a pressing plate 81 and an upper limit part 82. The pressing plate 81 is located between the upper cover 32 and the shell cover 11. The bottom end of the pressing plate 81 is sealed against the upper cover 32, and the top end of the pressing plate 81 is sealed against the cover body. The pressing plate 81 is provided with a pressing plate hole 811, and the pressing plate hole 811 is connected with the filter element hole 321. The upper limit part 82 is fixed to the lower end surface of the pressing plate 81, and the upper limit part 82 is provided with an upper limit hole. The upper cover 32 cooperates with the upper limit part 82 and is sealed against the pressing plate 81. The pressing plate 81 presses the PP filter element, and the upper limit part 82 increases the position stability of the upper end of the PP filter element. The two work together to increase the airtightness between the filter element and the pressure cover, making the device more suitable for pressurized filtration scenarios.
[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.
Claims
1. A grease precision filtering device, characterized in that: The invention comprises a housing, an oil injection pump, a PP filter element and a first oil outlet valve; the housing comprises a housing cover, a housing wall and a housing bottom which are arranged in sequence from top to bottom, the housing cover is provided with an oil inlet hole, one end of the housing wall is detachably sealed with the housing cover, the other end of the housing wall is arranged along the outer circumference of the housing bottom and is sealed with the housing bottom, the housing bottom is provided with a first oil outlet hole, the housing cover, the housing wall and the housing bottom form a first accommodation space; the output end of the oil injection pump is sealed with the housing through a pipeline and communicates with the first accommodation space through the oil inlet hole; the PP filter element is located in the first accommodation space, the upper end of the PP filter element is sealed with the housing cover, the lower end of the PP filter element is fixed with the housing bottom, the upper end of the PP filter element is provided with a filter element hole, the oil inlet hole is communicated with the inner cavity of the filter element through the filter element hole, and the filtration accuracy of the PP filter element is 45nm-50nm; the first oil outlet valve is fixed on the pipeline connected with the first oil outlet hole, and the first oil outlet valve is a pressure valve.
2. The grease precision filtering device according to claim 1, characterized in that: The PP filter element comprises a skeleton and a PP fiber layer. The PP fiber layer is composed of PP fibers wound around the skeleton. The diameter of the PP fibers is 9 μm to 11 μm.
3. The grease precision filtering device according to claim 2, characterized in that: The pore size of the PP fiber layer is arranged in a progressive step-like manner, and the pore size of the PP fiber layer gradually decreases from the inner cavity of the PP filter element to the outer side of the PP filter element.
4. The grease precision filtering device according to claim 2, characterized in that: The thickness of the PP fiber layer is 9 cm to 11 cm.
5. The grease precision filtering device according to claim 1, characterized in that: It also includes a second oil outlet valve. The shell bottom is funnel-shaped and is provided with a second oil outlet hole. The first oil outlet hole is located on the side of the funnel-shaped shell bottom, and the second oil outlet hole is located at the bottom of the funnel-shaped shell bottom. The second oil outlet valve is fixed on a pipeline connected to the second oil outlet hole.
6. The grease precision filtering device according to claim 1, characterized in that: It also includes a pressure gauge. The shell cover is also provided with a mounting hole. The pressure gauge is arranged through the mounting hole and is sealed and connected to the shell cover.
7. The grease precision filtering device according to claim 1, characterized in that: It also includes a support portion, which is located in the first accommodating space, and the support portion includes a support ring, a plurality of support bars and a lower limit portion. The bottom of the support ring abuts against the shell bottom, the outer wall of the support ring cooperates with the shell wall, and a plurality of the support bars are evenly distributed along the inner wall of the support ring. One end of the support bar is connected to the inner wall of the support ring, and the lower limit portion is fixed to the plurality of support bars. The connection between the lower limit portion and the support bar is located between the two ends of the support bar. The lower limit portion is provided with a lower limit hole, and the lower end of the PP filter element cooperates with the lower limit hole and abuts against the plurality of support bars.
8. The grease precision filtering device according to claim 7, characterized in that: The support portion further comprises a guide portion, the cross section of which is annular, the lower end of which is fixed to the upper end of the support ring, and the upper end surface of which is an inclined surface inclined from the outer side of the shell to the inner side of the shell.
9. The grease precision filtering device according to claim 7, characterized in that: The support portion further includes a reinforcing portion, which is ring-shaped, with an upper end of the reinforcing portion fixed to a lower end of the support ring, and a lower end of the reinforcing portion abutting against the shell bottom.
10. The grease precision filtering device according to claim 1, characterized in that: It also includes a clamping portion, which is located in the first accommodating space. The clamping portion includes a pressure plate and an upper limit portion. The bottom end of the pressure plate abuts against the upper end of the PP filter element, and the top end of the pressure plate abuts against the shell cover. The pressure plate is provided with a pressure plate hole, and the pressure plate hole is connected with the filter element hole. The upper limit portion is fixed to the lower end of the pressure plate, and the upper limit portion is provided with an upper limit hole. The upper end of the PP filter element cooperates with the upper limit portion and abuts against the pressure plate.