A dual canister filter cartridge
By setting layered filter media and spiral flow channels in the dual-cylinder filter element, the problems of the inability to combine layered filter media in integrated installation, insufficient sealing and low filtration efficiency are solved. Flexible filtration accuracy settings and self-cleaning function are achieved, which improves filtration efficiency and reduces turbulence.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINXIANG LONGQI FILTRATION EQUIP CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-06-05
Smart Images
Figure CN224321090U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of filtration-related technology, and in particular relates to a dual-cylinder filter element. Background Technology
[0002] The dual-cylinder filter, also known as a dual-cylinder return line filter, consists of two single-cylinder filters and a two-position six-way directional valve. It has a simple structure, is easy to use, and includes a bypass valve and a filter element clogging indicator to ensure system safety. During operation, when a single-cylinder filter element becomes clogged to a certain extent and needs cleaning or replacement, the main unit must be stopped. This is time-consuming and cannot meet the continuous operation requirements of the main unit. The dual-cylinder filter effectively solves this deficiency of the single-cylinder filter, allowing for filter element cleaning or replacement without stopping the main unit, ensuring normal continuous operation. When one filter element becomes clogged and needs replacement, it is not necessary to stop the main unit. Simply open the pressure balancing valve and turn the directional valve to allow the other filter to take over, and then replace the clogged element. However, regarding the filter elements, the following drawbacks still exist in actual filtration operations:
[0003] First, most filter cartridges are composed of multiple filter layers. A single filter layer obviously cannot meet the filtration requirements. However, multiple filter layers are usually installed together as a whole and cannot be separated or combined. The filtration accuracy is fixed, cannot be changed, and cannot be layered.
[0004] Secondly, the sealing between the filter media and the upper and lower end caps in the filter element is particularly important. If a layered filter media is used, the sealing performance can be easily reduced, so it is necessary to increase the sealing effect.
[0005] Secondly, after the filter element has been working for a long time, a large amount of impurities will be trapped on the filter media. When too much impurities accumulate, it is necessary to switch or replace the filter element. The service life of the filter element cannot be extended, and it lacks self-cleaning function.
[0006] Finally, conventional fluid filtration filters from the outside to the inside of the filter element, which is radial flow. This results in a short oil residence time and is also prone to turbulence. Utility Model Content
[0007] The purpose of this utility model is to provide a dual-cylinder filter element. By setting up a coarse filter layer, a middle filter layer, a fine filter layer, an upper end cover, a lower end cover, an outer rubber ring, a middle rubber ring, an inner rubber ring, a piezoelectric ceramic sheet, an outer spiral flow channel, and an inner spiral flow channel, it solves the problems of integrated filter media installation, inability to form different filtration precisions through layered combination, insufficient sealing of filter media after layered setting, lack of self-cleaning function of filter element, no extension of service life, and short residence time of oil in radial flow filtration, resulting in insufficient filtration efficiency and easy generation of turbulence.
[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0009] This utility model relates to a dual-cylinder filter element, comprising a lower end cover, an upper end cover, a protective rod, a coarse filter layer, a middle layer, and a fine filter layer. The upper end cover is positioned directly above the lower end cover. From the outside to the inside, the coarse filter layer, the middle layer, and the fine filter layer are sequentially arranged between the upper and lower end covers. An outer spiral flow channel is fitted around the coarse filter layer, and an inner spiral flow channel is fitted between the coarse filter layer and the middle layer. Outer rubber rings are engaged at both the upper and lower ends of the coarse filter layer, middle rubber rings are engaged at both the upper and lower ends of the middle layer, and inner rubber rings are engaged at both the upper and lower ends of the fine filter layer. A piezoelectric ceramic sheet is embedded inside the lower end cover.
[0010] Furthermore, a protective rod arranged in a ring array is fixed to the upper end of the lower end cover outside the outer spiral flow channel. The upper outer periphery of the protective rod is threaded and forms a threaded segment. A limit block is fixed to the outer periphery of the protective rod below the threaded segment. The limit block is located below the upper end cover, contacts and supports the upper end cover. The upper part of the threaded segment extends through the upper end cover and is screwed with a nut.
[0011] Furthermore, the outer wall of the outer spiral flow channel contacts the protective rod, and the inner wall of the outer spiral flow channel contacts the outer wall of the coarse filter layer; the outer wall of the inner spiral flow channel contacts the inner wall of the coarse filter layer, and the inner wall of the inner spiral flow channel contacts the outer wall of the intermediate layer.
[0012] Furthermore, the upper end cover and the lower end cover are provided with an outer ring groove, a middle ring groove and an inner ring groove with a reduced inner diameter component on their opposite surfaces, and the outer ring groove, the middle ring groove and the inner ring groove are provided with limiting holes distributed in a ring array.
[0013] Furthermore, the outer rubber rings at the upper and lower ends of the coarse filter layer are respectively embedded in the outer ring grooves inside the upper and lower end covers, and the size of the outer rubber rings matches the size of the outer ring grooves; the middle rubber rings at the upper and lower ends of the intermediate layer are respectively embedded in the middle ring grooves inside the upper and lower end covers, and the size of the middle rubber rings matches the size of the middle ring grooves; the inner rubber rings at the upper and lower ends of the fine filter layer are respectively embedded in the inner ring grooves inside the upper and lower end covers, and the size of the inner rubber rings matches the size of the inner ring grooves.
[0014] Furthermore, the upper and lower ends of the coarse filter layer, the intermediate layer, and the fine filter layer are all fixed with inserts arranged in a ring array. The inserts at the upper and lower ends of the coarse filter layer pass through the outer rubber ring and are respectively inserted into the limiting holes in the outer ring groove of the upper and lower end caps. The inserts at the upper and lower ends of the intermediate layer pass through the middle rubber ring and are respectively inserted into the limiting holes in the middle ring groove of the upper and lower end caps. The inserts at the upper and lower ends of the fine filter layer pass through the inner rubber ring and are respectively inserted into the limiting holes in the inner ring groove of the upper and lower end caps.
[0015] Furthermore, an outlet pipe is fixed through the center of the upper end cover, and the outlet pipe is connected to the inner cavity of the fine filter layer.
[0016] This utility model has the following beneficial effects:
[0017] This invention solves the problem of the inability to combine filter media in a single unit to achieve different filtration accuracies by setting up a coarse filter layer, an intermediate layer, a fine filter layer, an upper cover, and a lower cover. The coarse filter layer, intermediate layer, fine filter layer, upper cover, and lower cover are all detachable, allowing for the selection and combination of corresponding filter media to achieve different filtration accuracies. It also reduces the number of filter media layers, as different filtration accuracies can be obtained simply by replacing different filter media. This makes it convenient to use according to specific application scenarios. Users can freely combine accuracies (such as 10μm + 5μm + 1μm) to adapt to different working conditions. In case of partial clogging, only a single layer needs to be replaced, reducing maintenance costs.
[0018] This invention solves the problem of insufficient sealing of the filter material after layering by setting an outer rubber ring, a middle rubber ring, and an inner rubber ring. The outer rubber rings at the top and bottom of the coarse filter layer are respectively embedded into the outer ring grooves in the upper and lower end caps by snapping. The middle rubber rings at the top and bottom of the middle layer are respectively embedded into the middle ring grooves in the upper and lower end caps. The inner rubber rings at the top and bottom of the fine filter layer are respectively embedded into the inner ring grooves in the upper and lower end caps. This ensures that the coarse filter layer, middle layer, fine filter layer and the upper and lower end caps maintain sufficient sealing. The insert post is inserted into the limiting hole to maintain structural stability.
[0019] This invention solves the problem of filter cartridges lacking self-cleaning function and not having extended service life by setting piezoelectric ceramic plates. The piezoelectric ceramic plates are built into the lower end cover, and high-frequency vibration (>20kHz) is generated by passing low voltage current, which automatically shakes off the attached contaminants, thus greatly extending the service life and eliminating the need for frequent filter cartridge replacement.
[0020] This invention solves the problems of short oil residence time, insufficient filtration efficiency, and easy generation of turbulence in radial flow filtration by setting an outer spiral flow channel and an inner spiral flow channel. The fluid flows from the outside to the inside. Through the cooperation of the outer and inner spiral flow channels, the flow direction is changed, so that the oil flows along a spiral path (instead of the traditional radial flow), which prolongs the oil residence time and improves the filtration efficiency by more than 15%; reduces turbulence and lowers the initial pressure drop by 20%. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0022] Figure 1 A perspective view of a dual-cylinder filter element;
[0023] Figure 2This is a three-dimensional view of the upper end cap after sectional view;
[0024] Figure 3 This is a connection diagram of the upper end cap, lower end cap, and protective rod.
[0025] Figure 4 A cross-sectional view after removing the upper and lower end caps and the protective rod;
[0026] Figure 5 This is a distribution diagram of the coarse filter layer, intermediate filter layer, and fine filter layer.
[0027] Figure 6 This is a sectional view of the lower end cap;
[0028] Figure 7 This is a diagram showing the structural distribution of the inner and outer rubber rings, the middle rubber ring, and the inner rubber ring of the lower end cap.
[0029] Figure label:
[0030] 1. Lower end cap; 101. Upper end cap; 1011. Outlet pipe; 102. Outer annular groove; 103. Middle annular groove; 104. Inner annular groove; 105. Limiting hole; 106. Piezoelectric ceramic plate; 2. Protective rod; 201. Nut; 202. Threaded section; 203. Limiting block; 3. Coarse filter layer; 301. Outer rubber ring; 4. Intermediate layer; 401. Middle rubber ring; 5. Fine filter layer; 501. Inner rubber ring; 6. Outer spiral flow channel; 7. Inner spiral flow channel; 8. Insert post. Detailed Implementation
[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0032] Please see Figure 1-7 As shown, this utility model is a dual-cylinder filter element, including a lower end cover 1, an upper end cover 101, a protective rod 2, a coarse filter layer 3, an intermediate layer 4, and a fine filter layer 5. The upper end cover 101 is located directly above the lower end cover 1. The coarse filter layer 3, the intermediate layer 4, and the fine filter layer 5 are arranged sequentially from the outside to the inside between the upper end cover 101 and the lower end cover 1. An outer spiral flow channel 6 is also sleeved on the outside of the coarse filter layer 3, and an inner spiral flow channel 7 is sleeved between the coarse filter layer 3 and the intermediate layer 4. The upper and lower ends of the coarse filter layer 3 are both secured with outer rubber rings 301, the upper and lower ends of the intermediate layer 4 are both secured with middle rubber rings 401, and the upper and lower ends of the fine filter layer 5 are both secured with inner rubber rings 501. A piezoelectric ceramic sheet 106 is embedded inside the lower end cover 1.
[0033] The upper end cap 101 and the lower end cap 1 serve as mounting carriers, housing the corresponding coarse filter layer 3, intermediate layer 4, and fine filter layer 5. They are used in conjunction with the filter housing. During filtration, the oil enters from the outside and sequentially passes through the coarse filter layer 3, intermediate layer 4, and fine filter layer 5 (the coarse filter layer 3 can be a titanium alloy sintered mesh, the intermediate layer 4 can be carbon nanotube stainless steel fiber, and the fine filter layer 5 can be hydrophobically modified glass fiber, or optional components can be selected by the user). Finally, it flows out from the inner cavity of the fine filter layer 5. Outside the coarse filter layer 3, the oil flows along the outer spiral flow channel 6, causing the oil... The coarse filter layer 3 has a longer contact time, increasing filtration efficiency. Similarly, after the oil passes through the coarse filter layer 3, it flows along the inner spiral channel 7 and then passes through the intermediate layer 4, making the contact time between the oil and the intermediate layer 4 longer, increasing filtration efficiency, reducing turbulence, and reducing the initial pressure drop by 20%. The coarse filter layer 3 is sealed to the upper end cover 101 and the lower end cover 1 by the outer rubber ring 301, the intermediate layer 4 is sealed to the upper end cover 101 and the lower end cover 1 by the middle rubber ring 401, and the fine filter layer 5 is sealed to the upper end cover 101 and the lower end cover 1 by the inner rubber ring 501.
[0034] A piezoelectric ceramic sheet 106 is built into the lower end cover 1. When a low-voltage current is applied, high-frequency vibration (>20kHz) is generated, which automatically shakes off the contaminants attached to the coarse filter layer 3, the intermediate layer 4, and the fine filter layer 5, thus greatly extending its service life and eliminating the need for frequent filter replacement.
[0035] The lower end cap 1 outside the outer spiral flow channel 6 is fixed with a protective rod 2 arranged in a ring array. The upper outer periphery of the protective rod 2 is threaded and forms a threaded section 202. The outer periphery of the protective rod 2 below the threaded section 202 is fixed with a limiting block 203. The limiting block 203 is located below the upper end cap 101, contacts and supports the upper end cap 101. The upper part of the threaded section 202 extends through the upper end cap 101 and is screwed with a nut 201.
[0036] After installing the coarse filter layer 3, the intermediate filter layer 4, and the fine filter layer 5, place the upper cover 101 on top of the coarse filter layer 3, the intermediate filter layer 4, and the fine filter layer 5. At the same time, let the upper end of the protective rod 2 pass through the upper cover 101, and use the limiting block 203 for limiting support. Finally, use the nut 201 to lock it in place to complete the installation.
[0037] The outer wall of the outer spiral flow channel 6 contacts the protective rod 2, and the inner wall of the outer spiral flow channel 6 contacts the outer wall of the coarse filter layer 3; the outer wall of the inner spiral flow channel 7 contacts the inner wall of the coarse filter layer 3, and the inner wall of the inner spiral flow channel 7 contacts the outer wall of the intermediate layer 4; this facilitates the full guidance of the oil.
[0038] On the opposite surfaces of the upper end cover 101 and the lower end cover 1, there are outer ring grooves 102, middle ring grooves 103 and inner ring grooves 104 with reduced inner diameter components. Limiting holes 105 arranged in a ring array are provided in the outer ring grooves 102, middle ring grooves 103 and inner ring grooves 104.
[0039] The outer rubber rings 301 at the upper and lower ends of the coarse filter layer 3 are respectively embedded in the outer ring grooves 102 inside the upper end cover 101 and the lower end cover 1, and the outer rubber rings 301 and the outer ring grooves 102 are matched in size; the middle rubber rings 401 at the upper and lower ends of the intermediate layer 4 are respectively embedded in the middle ring grooves 103 inside the upper end cover 101 and the lower end cover 1, and the middle rubber rings 401 and the middle ring grooves 103 are matched in size; the inner rubber rings 501 at the upper and lower ends of the fine filter layer 5 are respectively embedded in the inner ring grooves 104 inside the upper end cover 101 and the lower end cover 1, and the inner rubber rings 501 and the inner ring grooves 104 are matched in size.
[0040] The upper and lower ends of the coarse filter layer 3, the intermediate layer 4, and the fine filter layer 5 are all fixed with inserts 8 arranged in a ring array. The inserts 8 at the upper and lower ends of the coarse filter layer 3 pass through the outer rubber ring 301 and are respectively inserted into the limiting holes 105 in the outer ring groove 102 of the upper end cover 101 and the lower end cover 1. The inserts 8 at the upper and lower ends of the intermediate layer 4 pass through the middle rubber ring 401 and are respectively inserted into the limiting holes 105 in the middle ring groove 103 of the upper end cover 101 and the lower end cover 1. The inserts 8 at the upper and lower ends of the fine filter layer 5 pass through the inner rubber ring 501 and are respectively inserted into the limiting holes 105 in the inner ring groove 104 of the upper end cover 101 and the lower end cover 1.
[0041] When installing the coarse filter layer 3, intermediate layer 4, and fine filter layer 5, first connect the upper and lower ends of the coarse filter layer 3 to the outer rubber ring 301, the upper and lower ends of the intermediate layer 4 to the middle rubber ring 401, and the upper and lower ends of the fine filter layer 5 to the inner rubber ring 501. Then, insert the inner rubber ring 501 connected to the lower end of the fine filter layer 5 into the inner ring groove 104 inside the lower end cover 1, and insert the corresponding insertion post 8 into the limiting hole 105. Next, insert the middle rubber ring 401 connected to the lower end of the intermediate layer 4 into the middle ring groove 103 inside the lower end cover 1, and insert the corresponding insertion post 8 into the limiting hole 105 inside the middle ring groove 103. Position hole 105, then the inner spiral flow channel 7 is sleeved on the outside of the intermediate layer 4. Finally, the outer rubber ring 301 at the lower end of the coarse filter layer 3 is inserted into the outer ring groove 102 in the lower end cover 1, and the corresponding insert post 8 is inserted into the limiting hole 105. Then, the outer spiral channel is sleeved on the coarse filter layer 3. Finally, the upper end cover 101 is covered, and the outer rubber ring 301, middle rubber ring 401 and inner rubber ring 501 at the upper end of the coarse filter layer 3, intermediate layer 4 and fine filter layer 5 are sequentially inserted into the outer ring groove 102, middle ring groove 103 and inner ring groove 104 in the upper end cover 101.
[0042] An outlet pipe 1011 is fixed through the center of the upper end cover 101, and the outlet pipe 1011 is connected to the inner cavity of the fine filter layer 5. The filtered oil is finally discharged from the outlet pipe 1011.
[0043] The specific working principle of this utility model is as follows: First, install the coarse filter layer 3, the intermediate layer 4, and the fine filter layer 5. First, snap the outer rubber ring 301 onto the upper and lower ends of the coarse filter layer 3, snap the middle rubber ring 401 onto the upper and lower ends of the intermediate layer 4, and snap the inner rubber ring 501 onto the upper and lower ends of the fine filter layer 5. Then, insert the inner rubber ring 501 snapped onto the lower end of the fine filter layer 5 into the inner annular groove 104 in the lower end cover 1, and insert the corresponding insert post 8 of the fine filter layer 5 into the limiting hole 105 in the inner annular groove 104. Then, insert the lower end of the intermediate layer 4... The snap-fit rubber ring 401 is inserted into the middle annular groove 103 inside the lower end cover 1, and the corresponding insert post 8 under the middle layer 4 is inserted into the limiting hole 105 in the middle annular groove 103 of the lower end cover 1. Then, the inner spiral flow channel 7 is sleeved on the outside of the middle layer 4. Finally, the outer rubber ring 301 at the lower end of the coarse filter layer 3 is inserted into the outer annular groove 102 inside the lower end cover 1, and the corresponding insert post 8 under the coarse filter layer 3 is inserted into the limiting hole 105 in the outer annular groove 102. Then, the outer spiral channel is sleeved on the coarse filter layer 3. Finally, the cover is closed. With the upper end cover 101 in place, the outer rubber ring 301, middle rubber ring 401, and inner rubber ring 501 at the top of the coarse filter layer 3, the intermediate filter layer 4, and the fine filter layer 5 are sequentially inserted into the outer annular groove 102, the middle annular groove 103, and the inner annular groove 104 within the upper end cover 101; simultaneously, the insert rods at the top of the coarse filter layer 3, the intermediate filter layer 4, and the fine filter layer 5 are inserted into the limiting holes 105 within the upper end cover 101, and the threaded section 202 at the top of the protective rod 2 extends through the upper end cover 101; finally, the nut 201 is screwed on and locked in place. During filtration, the oil enters from the outside and passes through the coarse filter layer 3, the intermediate layer 4, and the fine filter layer 5 in sequence. Finally, it flows out from the inner cavity of the fine filter layer 5 along the outlet pipe 1011. When the oil is outside the coarse filter layer 3, it flows along the outer spiral flow channel 6, which makes the oil contact time with the coarse filter layer 3 longer and increases the filtration efficiency. Similarly, after the oil passes through the coarse filter layer 3, it flows along the inner spiral flow channel 7 and then passes through the intermediate layer 4, which makes the oil contact time with the intermediate layer 4 longer, increases the filtration efficiency, reduces turbulence, and reduces the initial pressure drop by 20%.
[0044] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.
Claims
1. A dual-cylinder filter element, comprising a lower end cap (1), an upper end cap (101), a protective rod (2), a coarse filter layer (3), an intermediate layer (4), and a fine filter layer (5), characterized in that: An upper cover (101) is provided directly above the lower cover (1). A coarse filter layer (3), an intermediate layer (4), and a fine filter layer (5) are arranged sequentially from the outside to the inside between the upper cover (101) and the lower cover (1). An outer spiral flow channel (6) is also provided outside the coarse filter layer (3). An inner spiral flow channel (7) is provided between the coarse filter layer (3) and the intermediate layer (4). An outer rubber ring (301) is snapped into the upper and lower ends of the coarse filter layer (3). A middle rubber ring (401) is snapped into the upper and lower ends of the intermediate layer (4). An inner rubber ring (501) is snapped into the upper and lower ends of the fine filter layer (5). A piezoelectric ceramic sheet (106) is embedded inside the lower cover (1).
2. The dual-cylinder filter element according to claim 1, characterized in that: The lower end cap (1) outside the outer spiral flow channel (6) is fixed with a protective rod (2) arranged in a ring array. The upper outer periphery of the protective rod (2) is threaded and forms a threaded section (202). A limit block (203) is fixed on the outer periphery of the protective rod (2) below the threaded section (202). The limit block (203) is located below the upper end cap (101) and contacts and supports the upper end cap (101). The upper part of the threaded section (202) extends through the upper end cap (101) and is screwed with a nut (201).
3. The dual-cylinder filter element according to claim 2, characterized in that: The outer wall of the outer spiral channel (6) contacts the protective rod (2), and the inner wall of the outer spiral channel (6) contacts the outer wall of the coarse filter layer (3); the outer wall of the inner spiral channel (7) contacts the inner wall of the coarse filter layer (3), and the inner wall of the inner spiral channel (7) contacts the outer wall of the intermediate layer (4).
4. The dual-cylinder filter element according to claim 1, characterized in that: The upper end cover (101) and the lower end cover (1) are provided with an outer ring groove (102), a middle ring groove (103) and an inner ring groove (104) with reduced inner diameter components on their opposite surfaces. The outer ring groove (102), the middle ring groove (103) and the inner ring groove (104) are provided with limiting holes (105) arranged in a ring array.
5. A dual-cylinder filter element according to claim 4, characterized in that: The outer rubber rings (301) of the upper and lower ends of the coarse filter layer (3) are respectively embedded in the outer ring grooves (102) of the upper end cover (101) and the lower end cover (1), and the size of the outer rubber rings (301) and the outer ring grooves (102) are adapted to each other; the middle rubber rings (401) of the upper and lower ends of the intermediate layer (4) are respectively embedded in the middle ring grooves (103) of the upper end cover (101) and the lower end cover (1), and the size of the middle rubber rings (401) and the middle ring grooves (103) are adapted to each other; the inner rubber rings (501) of the upper and lower ends of the fine filter layer (5) are respectively embedded in the inner ring grooves (104) of the upper end cover (101) and the lower end cover (1), and the size of the inner rubber rings (501) and the inner ring grooves (104) are adapted to each other.
6. A dual-cylinder filter element according to claim 5, characterized in that: The upper and lower ends of the coarse filter layer (3), the intermediate layer (4), and the fine filter layer (5) are all fixed with inserts (8) arranged in a ring array. The inserts (8) at the upper and lower ends of the coarse filter layer (3) pass through the outer rubber ring (301) and are respectively inserted into the limiting holes (105) in the outer ring groove (102) of the upper end cover (101) and the lower end cover (1). The inserts (8) at the upper and lower ends of the intermediate layer (4) pass through the middle rubber ring (401) and are respectively inserted into the limiting holes (105) in the middle ring groove (103) of the upper end cover (101) and the lower end cover (1). The inserts (8) at the upper and lower ends of the fine filter layer (5) pass through the inner rubber ring (501) and are respectively inserted into the limiting holes (105) in the inner ring groove (104) of the upper end cover (101) and the lower end cover (1).
7. A dual-cylinder filter element according to claim 1, characterized in that: An outlet pipe (1011) is fixed through the center of the upper end cap (101), and the outlet pipe (1011) is connected to the inner cavity of the fine filter layer (5).