Filter device of dust filter and CVS valve assembly with novel structure

Abstract

The utility model relates to a filter device of an ash filter and CVS valve assembly, which has a novel structure and is used on an automobile, and solves the problems that the connection mode between an end cover and a tank body of the ash filter in the prior art is complicated, and the disassembly and assembly processes are tedious when a filter element is replaced. The device is characterized in that the end cover and the tank body are connected in a guide insertion and rotary clamping mode, and the connection stability of the end cover and the tank body is further guaranteed through a non-return locking device; the CVS valve is connected with the ash filter in a guide insertion and rotary clamping mode, so that the CVS valve can be accurately and rapidly connected with or detached from the ash filter, the connection stability is ensured by arranging a CVS valve check locking device, and the installation efficiency and quality are improved. Furthermore, the filtering and waterproof performance of the whole ash filter is improved through optimization of the air inlet channel of a labyrinth structure, the height of the air outlet end opening in the tank body and other structures.

Description

Technical Field

[0001] This utility model relates to the field of filter technology; specifically, it relates to a filter device with a novel structure of ash filter and CVS valve assembly used in automobiles. Background Technology

[0002] In the prior art, automotive ash filters usually refer to the ash filters or carbon canister ash filters of fuel evaporative emission control systems. Their main function is to be installed on the pipeline path connecting the system to the outside world to filter dust and particulate matter in the air, prevent them from entering the system, and thus protect the relevant components.

[0003] Currently, the main structure of gray filter systems on the market consists of three parts: end caps, filter elements, and a canister. The end caps and canisters are injection-molded parts, with the filter element housed within them. The end caps and canisters are connected and fixed using snap-fit ​​or welding methods, depending on design requirements. The gray filters described above are widely used in both traditional energy vehicles powered purely by internal combustion engines and hybrid new energy vehicles that combine pure electric and internal combustion engine power.

[0004] However, the connection between the end cap and the tank of the existing gray filter is complicated. When replacing the filter element, the disassembly and installation process is cumbersome, requiring professional tools and high operating skills. This not only increases maintenance costs but also reduces work efficiency. Moreover, frequent replacement can easily cause damage to components and affect the service life of the gray filter. The existing gray filter structure is also prone to the problem of filter element reverse installation, which will cause the filtration function to fail and fail to achieve the expected use effect.

[0005] In addition, the existing ash filter structure does not perform well in terms of waterproofing. In humid environments or working conditions where water may come into contact with the filter, water can easily enter the interior of the ash filter, damaging the filter element and other components, reducing the filtration effect, and even causing equipment failure.

[0006] Furthermore, to meet the requirements of On-Board Diagnostics (OBD) systems, CVS valves are often installed in some vehicle models. The CVS valve is used to introduce air into the carbon canister and guide the steam flow. There are two installation methods for CVS valves: one is integrated, installed on the carbon canister body or ash filter, for example, Chinese patent document CN209067375U discloses a novel integrated CVS valve air filter for carbon canisters; the other is a separate type, connected in series on the pipeline, and the installation method is generally chosen based on the overall layout of the fuel tank. A malfunctioning CVS valve will inevitably affect OBD testing. Both installation methods have certain limitations. With integrated CVS valves, the ash filter cannot be removed separately for repair or replacement; while with series-connected carbon canister ventilation solenoid valves (CVS) and ash filters, the connection via pipeline structure leads to installation difficulties, high costs, and potential instability, thus affecting the performance and stability of the entire system. Summary of the Invention

[0007] One of the technical problems to be solved by this utility model is to provide a new type of gray filter that is easy to install and disassemble and facilitates the installation of filter elements.

[0008] The second technical problem to be solved by this utility model is to provide a filter device with a novel structure for a ash filter and a CVS valve assembly, which can ensure a stable connection between the ash filter tank and the CVS.

[0009] The third technical problem to be solved by this utility model is to solve the existing problems in waterproofing of ash filter structures and improve the reliability and practicality of ash filter devices.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A novel ash filter includes a tank, an end cap for sealing the opening of the tank, and a hollow filter element located inside the tank. The tank is characterized in that: the tank is provided with a first guide structure that matches the shape of the outer edge of the end cap for guiding the end cap to be aligned and inserted into the tank; after the end cap is inserted into the tank and rotated into place, the end cap and the tank are locked together by a locking and fixing structure of a slot and a locking block.

[0012] Preferably, a number of locking blocks are provided on the outer wall of the part of the end cap that is inserted into the tank, and a number of corresponding slots are opened on the tank wall. After the end cap is inserted into the tank and rotated into place, the locking blocks engage with the corresponding slots on the tank to achieve locking.

[0013] Furthermore, the ash filter is also equipped with an end cap check lock device.

[0014] Preferably, the end cap anti-return locking structure is as follows: the end cap is provided with a strip-shaped protrusion, and a boss is provided on the outside of the tank body. The boss has a corresponding anti-return groove of a corresponding shape in the middle of the strip-shaped protrusion. When the end cap is rotated to the locking position, the strip-shaped protrusion is inserted into the anti-return groove to play a role in anti-return locking.

[0015] Furthermore, the air inlet on the tank is provided with a labyrinth-structured air intake channel, which is an air intake channel with a tortuous path composed of multiple intersecting baffles.

[0016] Furthermore, the air inlet channel on the tank body is connected to the air outlet port that protrudes inward from the center of the bottom of the tank body. The filter element is sleeved on the air outlet port. The inner hole of the filter element and the air outlet port of the tank body are fitted together by an interference fit to achieve a first sealing structure. The outer periphery of the filter element and the inner wall of the tank body are fitted together by an interference fit to achieve a second sealing structure. The filter element and the tank body form a double sealing structure.

[0017] Preferably, the height H of the upper port of the air outlet to the root is between 1 / 2 and 3 times its outer diameter D.

[0018] A filter device for a CVS valve assembly includes a CVS valve and a dust filter of the novel structure. The dust filter has a connection port, and the CVS valve has a connector that can be detachably inserted into the connection port. The connection port is characterized by having a second guide structure that matches the shape of the outer edge of the connector to guide the CVS valve connector to be aligned and inserted into the connection port. After the CVS valve connector is inserted into the connection port and rotated into place, the CVS valve connector and the connection port are locked together by a locking structure of a slot and a locking block.

[0019] Furthermore, the filter unit of the CVS valve assembly is also equipped with a CVS valve check lock device.

[0020] Preferably, the CVS valve check lock device is as follows: a check bar is provided on the ash filter tank, and a stop is provided outside the CVS valve. When the CVS valve is rotated to the locking position, the stop and the check bar cooperate with each other to achieve check lock by locking.

[0021] The beneficial effects of this utility model are:

[0022] 1. Easy filter replacement: The end cap and tank are connected by a guide insertion and rotation locking method. The check lock device further ensures the stability of the connection between the end cap and the tank. No special tools are required. Ordinary operators can easily disassemble and replace the filter, saving time and labor costs.

[0023] 2. The CVS valve connects to the ash filter through a guide insertion and rotational locking method, enabling the CVS valve to be accurately and quickly connected or disconnected from the ash filter. It is also equipped with a CVS valve check lock device to ensure the stability of the connection, thereby improving installation efficiency and quality.

[0024] 3. The labyrinthine air intake channel forces air to traverse multiple winding paths before entering the filter, effectively blocking dust and water droplets and improving the filter's filtration and waterproofing performance. The double-sealing structure between the filter element and the canister effectively prevents unfiltered air from leaking through the gaps between the filter element and the canister. Raising the height of the canister's air outlet port, which mates with the filter element's inner hole, further blocks moisture from entering the filter, enhancing its overall waterproofing performance and effectively preventing the filter element from being installed backwards. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0026] Figure 1 Schematic diagram of a preferred embodiment of a novel ash filter according to this utility model.

[0027] Figure 2(a): Figure 1 Top view of the gray filter shown

[0028] Figure 2(b): AA cross-sectional view of the ash filter shown in Figure 2(a)

[0029] Figure 3 : Figure 1 Schematic diagram of the end cap of the ash filter shown.

[0030] Figure 4(a): Figure 1 The diagram shows the external exterior of the ash filter tank.

[0031] Figure 4(b): Figure 1 The diagram shows the internal structure of the ash filter tank.

[0032] Figure 4(c): Figure 1 Top view of the ash filter tank shown.

[0033] Figure 4(d): AA cross-sectional view of the ash filter tank shown in Figure 4(c)

[0034] Figure 4(e): Schematic diagram of air outlet height

[0035] Figure 5(a): with Figure 1 The diagram shows a filter unit of the CVS valve assembly for the ash filter.

[0036] Figure 5(b): CVS valve and Figure 1 The diagram shows the assembly of the ash filter tank.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. End cap; 11. Locking block; 12. Strip-shaped protrusion;

[0039] 2. Tank body; 21. Slot; 22. First guide structure; 23. Boss; 231. Check groove; 24. Labyrinth structure air intake channel; 25. Air outlet port; 26. CVS valve connection port; 261. Second guide structure; 262. Slot; 27. Check bar;

[0040] 3. Filter element; 311. First sealing structure; 312. Second sealing structure;

[0041] 4. CVS valve; 41. CVS valve connector; 411. Clamping block; 42. Stop block. Detailed Implementation

[0042] like Figure 1 As shown, this utility model provides a replaceable filter element and easy-to-install ash filter, including a tank 2, an end cap 1 for sealing the opening of the tank, and a hollow filter element 3 located inside the tank 2.

[0043] See also Figure 1 Figure 2(a), Figure 2(b) Figure 3 In this embodiment, the lower outer edge of the end cap 1 is provided with several protruding locking blocks 11, and the tank body 2 is provided with a first guide structure 22 corresponding to the several locking blocks 11 on the lower outer edge of the end cap 1 and several locking grooves 21. The end cap 1 is also provided with a strip-shaped protrusion 12, and the outside of the tank body 2 is provided with a boss 23. A check groove 231 that cooperates with the strip-shaped protrusion 12 is opened in the middle of the boss 23. The two cooperate with each other to form a check lock device, which can effectively prevent the end cap 1 from falling off.

[0044] When installing the filter element 3, the hollow filter element 3 is pressed into the tank body 2 by external force and fitted onto the air inlet port 25 in the center of the tank body 2. The filter element 3 is composed of a non-woven fabric sealing ring at its lower end, a filter medium in its middle, and a non-woven fabric sealing end cap at its upper end. The filter medium in the middle is a cylindrical multi-layer, folded filter structure. The non-woven fabric sealing ring is a circular sheet, and the non-woven fabric sealing end cap is a circular sheet. The filter medium is seamlessly bonded to the non-woven fabric sealing end cap and the non-woven fabric sealing ring with hot melt adhesive to form a sealing structure. The filter element 3 has a double sealing structure inside the tank 2. The first sealing structure 311 is achieved by an interference fit between the inner hole of the non-woven fabric sealing ring at the lower end of the filter element 3 and the air outlet 25 of the tank 2. The second sealing structure 312 is achieved by an interference fit between the outer edge of the non-woven fabric sealing ring at the lower end of the filter element 3 and the inner wall of the accommodating space of the tank 2. The double sealing structure can effectively prevent unfiltered air from leaking from the gap between the filter element 3 and the tank 2. After assembling the filter element 3, the protruding locking block 11 of the end cap 1 is aligned with the first guide structure 22 of the tank 2 and inserted. The end cap 1 is rotated so that the locking block 11 of the end cap 1 is engaged in the tank groove 21. The end cap 1 is rotated further. When the end cap 1 is rotated to the locking position, the strip-shaped protrusion 12 of the end cap 1 is engaged in the check groove 231 of the tank to achieve check lock. The filter element is now installed.

[0045] When replacing the filter element, rotate the end cap 1 in the opposite direction of installation to disengage the strip-shaped protrusion 12 of the end cap 1 from the check groove 231 of the tank body. Continue to rotate the end cap 1 in the opposite direction of installation to disengage the end cap 1 locking block 11 from the tank body locking groove 21. Rotate the end cap 1 to the position where the first guide structure 22 is provided in the tank body 2 and pull it out to complete the separation of the end cap 1 from the tank body 2. A new filter element 3 can be replaced as needed, and the inside of the tank body 2 can be cleaned. The filter element replacement is completed by following the installation steps.

[0046] Referring to Figures 4(a), 4(b), 4(c), 4(d), and 4(e), the lower circumference of the tank 2 has a labyrinth-structured air inlet channel 24, which connects to the outlet port 25 inside the tank 2. During operation, gas first enters through the labyrinth-structured air inlet channel 24. This labyrinth structure consists of multiple intersecting baffles, forcing the air to traverse a winding path before entering the ash filter, effectively blocking dust and water droplets. After entering the inner hole of the filter element 3 installed inside the tank 2, the air is filtered by the filter element 3. This invention further prevents water droplets formed by moisture entering the ash filter by appropriately raising the height of the outlet port 25. Water droplets entering the tank will slide off as the tank shakes and flow out from the aforementioned air inlet. The preferred range for the height of the aforementioned air outlet port 25 is: the height H from the upper port to the root is 1 / 2 to 3 times the outer diameter D. The actual height can be adjusted according to the angle of the vehicle body layout. The final height is such that it can effectively form a water-blocking dam without generating high airflow resistance due to excessively long pipes. In this embodiment, H = 1.5 * D is used. A higher air outlet port can also effectively prevent accidental reverse installation of the filter element.

[0047] Referring to Figure 5, the tank body 2 has a CVS valve connection port 26 for installing the CVS valve 4 on its exterior. The outer edge of the CVS valve connector 41 has several protruding locking blocks 411. The CVS valve connection port 26 has a second guide structure 261 corresponding to the locking blocks 411 and several slots 262. The tank body 2 also has a check bar 27 to prevent the CVS valve 4 from falling off after installation. During CVS valve installation, the CVS valve connector 41 is inserted into the CVS valve connection port 26 on the ash filter tank under the guidance of the second guide structure 261. The CVS valve 4 is rotated so that the locking blocks 411 on the CVS valve connector 41 and the slots 262 on the CVS valve connection port 26 on the tank body 2 engage. The CVS valve 4 is further rotated until the stop block 42 on the CVS valve 4 and the check bar 27 on the outside of the tank body 2 engage to lock the valve in place, completing the CVS valve installation.

[0048] When separating the CVS valve, rotate the CVS valve in the opposite direction of installation to disengage the stop block 42 on the CVS valve 4 from the check bar 27 outside the tank body 2. Continue to rotate the CVS valve 4 in the opposite direction of installation to disengage the locking block 411 from the locking groove 262. Rotate the CVS valve 4 to the position where the second guide structure 261 is provided at the CVS valve connection port 26 and pull it out to complete the separation of the CVS valve 4 from the tank body 2.

[0049] In all the locking structures described above, the positions of the protrusions and slots used for locking can be interchanged. For example, a slot can be opened at the bottom of the end cap, and a corresponding locking block for locking into the slot can be provided on the inner wall of the tank. A guide structure is set at the bottom of the end cap corresponding to the locking block on the inner wall of the tank. And so on. The working principle remains unchanged, and the same technical effect can still be achieved.

[0050] The embodiments described above are only used to illustrate the present utility model and are not intended to limit the present utility model. Any person skilled in the art can make various modifications, changes or substitutions without departing from the technical scope disclosed in the present utility model. Therefore, all equivalent and similar technical methods should be covered within the patent protection scope of the present utility model.

Claims

1. A novel type of ash filter, comprising a tank, an end cap for sealing the open end of the tank, and a hollow filter element located inside the tank, characterized in that: The tank body is provided with a first guide structure that matches the shape of the outer edge of the end cap for guiding the end cap to be aligned and inserted into the tank body. After the end cap is inserted into the tank body and rotated into place, the end cap and the tank body are locked together by a locking and fixing structure of a slot and a locking block.

2. A novel ash filter according to claim 1, characterized in that: Several locking blocks are provided on the outer wall of the part of the end cap that is inserted into the tank, and several corresponding slots are opened on the tank wall. After the end cap is inserted into the tank and rotated into place, the locking blocks engage with the corresponding slots on the tank to achieve locking.

3. A novel ash filter according to claim 1 or 2, characterized in that: The ash filter is also equipped with an end cap anti-return locking device.

4. A novel ash filter according to claim 3, characterized in that: The end cap anti-return locking structure is as follows: the end cap has a strip-shaped protrusion, and a boss is provided on the outside of the tank. The boss has a corresponding anti-return groove of a corresponding shape in the middle of the strip-shaped protrusion. When the end cap is rotated to the locking position, the strip-shaped protrusion is inserted into the anti-return groove to play the role of anti-return locking.

5. A novel ash filter according to claim 3, characterized in that: The air inlet on the tank is equipped with a labyrinth-structured air intake channel, which is a tortuous path composed of multiple intersecting baffles.

6. A novel ash filter according to claim 5, characterized in that: The air inlet channel on the tank body is connected to the air outlet port that protrudes inward from the center of the bottom of the tank body. The filter element is sleeved on the air outlet port. The inner hole of the filter element and the air outlet port of the tank body are fitted together by an interference fit to achieve a first sealing structure. The outer periphery of the filter element and the inner wall of the tank body are fitted together by an interference fit to achieve a second sealing structure. The filter element and the tank body form a double sealing structure.

7. A novel ash filter according to claim 6, characterized in that: The height H of the upper port of the air outlet to the root ranges from 1 / 2 to 3 times its outer diameter D.

8. A filter device for a CVS valve assembly, characterized in that: The device includes a CVS valve and a ash filter as described in any one of claims 1-7. The ash filter is provided with a connection port, and the CVS valve is provided with a connector that can be detachably inserted into the connection port. The connection port is provided with a second guide structure that matches the shape of the outer edge of the connector to guide the CVS valve connector to be aligned and inserted into the connection port. After the CVS valve connector is inserted into the connection port and rotated into place, the CVS valve connector and the connection port are locked together by a locking structure of a slot and a locking block.

9. A filter device for a CVS valve assembly according to claim 8, characterized in that: The filter unit of the CVS valve assembly is also equipped with a CVS valve check lock device.

10. A filter device for a CVS valve assembly according to claim 9, characterized in that: The CVS valve check lock device is as follows: a check bar is provided on the ash filter tank, and a stop is provided outside the CVS valve. When the CVS valve is rotated to the locking position, the stop and the check bar cooperate with each other to achieve check lock by locking.

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