Compressed gas filter with replaceable filter element

Abstract

The compressed gas filter is structurally characterized in that a filter element shell is cylindrical, one end of the filter element shell is open, the inner side of the filter element shell axially extends from the open end to the other end to the position close to the middle to form a filter element groove, a PE filter element is installed in the filter element groove, and a filter element fixing base is installed at the end, close to the open end of the filter element shell, of the PE filter element; a step at the outer end of the filter element fixing base is fixed to the open end of the filter element shell, a supporting base is installed at the other end of the PE filter element, a ball valve is installed on the side face of the filter element shell, and a ball body of the ball valve is located in the filter element shell on the side, away from the PE filter element, of the supporting base. One end of the first quick-plug connector is located in the filter element shell and close to the ball valve, and the L-shaped second quick-plug connector is installed on the filter element fixing base. The filter element has the advantages that the replaceable PE material filter element is adopted, and the problems that in the prior art, a wood pulp paper filter element is prone to fiber falling, a post-treatment system is damaged, and the maintenance cost is high are solved.

Description

Technical Field

[0001] This invention relates to a compressed gas filter, specifically a pre-compressed gas filter for a commercial vehicle urea aftertreatment system with replaceable filter element. Background Technology

[0002] In commercial vehicle urea aftertreatment systems, compressed gas needs to pass through a pre-filter (compressed gas filter) to remove impurities and ensure stable operation of the aftertreatment system.

[0003] In existing technologies, mainstream compressed gas filters generally use wood pulp paper as the filter material, which mainly has the following problems: 1) Risk of fiber shedding: Wood pulp paper filter cartridges are prone to shedding wood pulp fibers under long-term use or airflow impact. These fibers may enter the urea post-treatment system with compressed gas, leading to a decrease in urea injection pressure, blockage of urea nozzles, or even damage to components. 2) High maintenance costs: Most existing products are designed as an integrated filter canister. When the filter element fails, the entire filter canister needs to be replaced, resulting in high material and labor costs. 3) Functional limitations: limited functionality and insufficient adaptability. Summary of the Invention

[0004] The present invention proposes a compressed gas filter with replaceable filter element, which aims to overcome the above-mentioned shortcomings of the prior art, avoid damage to the post-treatment system, and reduce maintenance costs.

[0005] The technical solution of the present invention is a compressed gas filter with a replaceable filter element, which uses a replaceable PE material filter element to solve the problems of easy fiber shedding and damage to the post-processing system and high maintenance cost of existing wood pulp paper filter elements.

[0006] Specifically, its structure includes a filter housing, a PE filter element, and a filter element mounting base. The filter housing is cylindrical with one end open. A filter element groove is formed on the inner side of the filter housing, extending axially from the open end to the other end near the middle. The PE filter element is installed in the filter element groove. The filter element mounting base is installed at the end of the PE filter element near the open end of the filter housing. A step at the outer end of the filter element mounting base is fixed to the open end of the filter housing. A support base is installed at the other end of the PE filter element. Preferably, it also includes a first quick-connect fitting, a ball valve, and a second quick-connect fitting. The ball valve is installed on the side of the filter element housing. The valve ball of the ball valve is located inside the filter element housing on the side of the support base away from the PE filter element. A PTFE gasket is provided between the valve ball and the filter element housing. The valve stem assembly connected to the valve ball passes through the filter element housing and is connected to the handle on the outside of the filter element housing. The first quick-connect fitting is installed at the other end of the filter element housing. One end of the first quick-connect fitting is located inside the filter element housing near the ball valve. The L-shaped second quick-connect fitting is installed on the filter element fixing base.

[0007] Preferably, the first quick-connect fitting is threaded to the other end of the filter housing, and an O-ring is provided between the threaded end and the filter housing.

[0008] Preferably, a first washer is provided between the step of the filter element fixing base and the open end of the filter element housing.

[0009] Preferably, the end of the second quick-connect connector is threaded onto the filter element fixing base, and a second washer is provided between the outer side of the filter element fixing base and the quick-connect connector.

[0010] Preferably, the channel at the center of the first quick-connect connector, the ball of the ball valve, the airflow channel of the PE filter element, and a portion of the channel of the second quick-connect connector are coaxially arranged.

[0011] Advantages of this invention: It features a reasonable structural design and uses a replaceable PE filter element, which solves the problem of fiber shedding in wood pulp paper filter elements compared to existing technologies. This avoids malfunctions in the urea aftertreatment system caused by impurities clogging the system and extends its service life. Maintenance costs are reduced, requiring only filter element replacement (costing approximately 1 / 5 to 1 / 8 of the overall filter canister), thus reducing material and labor costs. Adaptability is enhanced: it improves the stability and compatibility of compressed gas filters under complex operating conditions in commercial vehicles. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the replaceable filter element compressed gas filter of the present invention.

[0013] Figure 2 This is a cross-sectional structural schematic diagram of the replaceable filter element compressed gas filter of the present invention.

[0014] In the diagram, 1 is the first quick-connect fitting, 11 is the O-ring, 2 is the ball valve, 21 is the valve ball, 211 is the PTFE gasket, 22 is the valve stem assembly, 23 is the handle, 3 is the filter cartridge housing, 4 is the support base, 5 is the PE filter cartridge, 6 is the filter cartridge fixing base, 7 is the second quick-connect fitting, 8 is the first washer, and 9 is the second washer. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0016] like Figure 1 , 2As shown, a replaceable filter cartridge compressed gas filter includes a first quick-connect connector 1, a ball valve 2, a filter cartridge housing 3, a PE filter cartridge 5, a filter cartridge fixing base 6, and a second quick-connect connector 7. The filter cartridge housing 3 is cylindrical and open at one end. A filter cartridge groove is formed on the inner side of the filter cartridge housing 3, extending axially from the open end to the other end near the middle. The PE filter cartridge 5 is installed in the filter cartridge groove. The filter cartridge fixing base 6 is installed at the end of the PE filter cartridge 5 near the open end of the filter cartridge housing 3. A step at the outer end of the filter cartridge fixing base 6 is fixed to the open end of the filter cartridge housing 3. A support base 4 is installed at the other end of the filter element 5. A ball valve 2 is installed on the side of the filter element housing 3. The valve ball 21 of the ball valve 2 is located inside the filter element housing 3 on the side of the support base 4 away from the PE filter element 5. A PTFE gasket 211 is provided between the valve ball 21 and the filter element housing 3. The valve stem assembly 22 connected to the valve ball 21 passes through the filter element housing 3 and is connected to the handle 23 on the outside of the filter element housing 3. A first quick connector 1 is installed at the other end of the filter element housing 3. One end of the first quick connector 1 is located inside the filter element housing 3 near the ball valve 2. An L-shaped second quick connector 7 is installed on the filter element fixing base 6.

[0017] During specific installation, the end of the first quick connector 1 is threaded onto the other end of the filter element housing 3, and an O-ring 11 is provided between the threaded end and the filter element housing 3. A first washer 8 is provided between the step of the filter element fixing base 6 and the open end of the filter element housing 3. The end of the second quick connector 7 is threaded onto the filter element fixing base 6, and a second washer 9 is provided between the outer side of the filter element fixing base 6 and the quick connector 7.

[0018] In the specific design, the channel at the center of the first quick connector 1, the ball of the ball valve 2, the airflow channel of the PE filter element 5, and a part of the channel of the second quick connector 7 are coaxially arranged.

[0019] The first quick-connector 1 is specifically an SAE quick-connector, and the second quick-connector 7 is a pneumatic quick-connector.

[0020] In the above structure, the PE filter element 5 differs from existing wood pulp paper filter elements by using polyethylene as the filter material, which has the following advantages: 1) The molecular structure is compact, eliminating the risk of fiber shedding and avoiding damage to the urea post-treatment system; 2) Strong resistance to chemical corrosion (suitable for complex components such as oil, gas, and water vapor in compressed gas used in commercial vehicles); 3) High mechanical strength, not easily damaged during long-term use, thus extending the filter element's lifespan.

[0021] The vacuum filter structure with quick-connect fittings allows for a filtration accuracy of ≤5μm, matching the requirements of the urea post-treatment system for impurity particle size. The optimized airflow channel reduces pressure loss and ensures stable compressed gas supply.

[0022] The filter housing 3 integrates the ball valve 2, which has both air circuit shut-off and gas filtration functions. 1) When replacing PE filter element 5, closing ball valve 2 can disconnect the air circuit to prevent gas leakage when disassembling PE filter element 5; 2) When the downstream system of the filter element is under maintenance or in case of emergency gas cut-off, closing ball valve 2 can disconnect the gas path and prevent the gas supply from continuing.

[0023] The entire design adopts a replaceable filter element structure, which can effectively reduce maintenance costs. Compared with the existing technology of integral filter tank structure, it adopts a modular design of "shell + replaceable filter element". 1) The main body of the filter cartridge housing 3 is preferably made of high-pressure resistant metal / composite material, which can be reused for a long time; 2) Only the PE filter element 5 needs to be removed during replacement; the entire housing does not need to be replaced. 3) The contact area between the filter housing 3 and the support base 4 and the filter fixing base 6 is preferably made of PE material with self-sealing to ensure isolation between the dirty and clean sides.

[0024] All of the components described above are existing technologies, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0025] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A compressed gas filter with a replaceable filter element, characterized in that, The filter includes a filter housing (3), a PE filter element (5), and a filter element fixing base (6). The filter housing (3) is cylindrical and open at one end. The inner side of the filter housing (3) extends axially from the open end to the other end to form a filter element groove near the middle. The PE filter element (5) is installed in the filter element groove. The filter element fixing base (6) is installed at one end of the PE filter element (5) near the open end of the filter housing (3). The step at the outer end of the filter element fixing base (6) is fixed on the open end of the filter housing (3). The other end of the PE filter element (5) is installed with a support base (4).

2. A replaceable filter element compressed gas filter as described in claim 1, characterized in that, It also includes a first quick connector (1), a ball valve (2) and a second quick connector (7). The ball valve (2) is installed on the side of the filter housing (3). The valve ball (21) of the ball valve (2) is located in the filter housing (3) on the side of the support base (4) away from the PE filter element (5). A PTFE gasket (211) is provided between the valve ball (21) and the filter housing (3). The valve stem assembly (22) connected to the valve ball (21) passes through the filter housing (3) and is connected to the handle (23) on the outside of the filter housing (3). The first quick connector (1) is installed on the other end of the filter housing (3). One end of the first quick connector (1) is located inside the filter housing (3) near the ball valve (2). The L-shaped second quick connector (7) is installed on the filter fixing base (6).

3. A replaceable filter element compressed gas filter as described in claim 2, characterized in that, The first quick-connect connector (1) is threaded to the other end of the filter housing (3), and an O-ring (11) is provided between the threaded end and the filter housing (3).

4. A compressed gas filter with a replaceable filter element as described in claim 2, characterized in that, A first washer (8) is provided between the step of the filter element fixing base (6) and the open end of the filter element housing (3).

5. A replaceable filter element compressed gas filter as described in claim 2, characterized in that, The end of the second quick-connect connector (7) is installed on the filter element fixing base (6) by means of threads, and a second washer (9) is provided between the outer side of the filter element fixing base (6) and the quick-connect connector (7).

6. A compressed gas filter with a replaceable filter element as described in claim 2, characterized in that, The channel at the center of the first quick connector (1), the ball of the ball valve (2), the airflow channel of the PE filter element (5), and a portion of the channel of the second quick connector (7) are coaxially arranged.

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