A nested dual filter stainless steel gas filter

Abstract

The utility model relates to gas filter technical field, and disclose a kind of nested double filter element stainless steel gas filter, including shell and coaxially arranged on the two sides of shell import connector and export connector;Coaxially arranged in the shell filter core assembly, the filter core assembly includes A filter core, A filter cover, B filter core and B filter cover;A filter core is coaxially arranged in shell inner chamber, and there is clearance A between A filter core and shell inner wall, the one end surface of A filter cover is welded with A filter core by argon arc welding and carries out ring seam welding, the one end surface of B filter core is welded with A filter cover by argon arc welding and carries out ring seam welding, B filter cover is welded in the side of B filter core away from A filter cover by argon arc welding and carries out ring seam welding. Whole sealing is realized by full metal argon arc welding connection, completely eliminates the aging and leakage risk caused by O-ring, gasket and other non-metallic sealing elements in traditional filter, especially suitable for high-purity, ultrahigh vacuum or corrosive gas working condition, ensure long-term stable operation.

Description

Technical Field

[0001] This utility model relates to the field of gas filter technology, specifically to a nested dual-filter stainless steel gas filter. Background Technology

[0002] Currently, industrial gas filters generally suffer from a trade-off between size and filtration efficiency. On the one hand, traditional two-stage filters typically use two independent housings connected by external pipes and connectors to form an airflow path. This not only occupies a lot of space and increases the weight of the system, but also makes installation extremely inconvenient in space-constrained equipment (such as integrated gas circuit boards), while increasing the risk of pipeline leaks and failures. On the other hand, manufacturing and maintenance costs are high: each independent filter requires a complete housing, end caps, seals, and support structure, resulting in high material consumption and long processing time. In daily maintenance, disassembling and replacing filter elements requires separate operations on both filters, which is cumbersome, time-consuming, and labor-intensive.

[0003] Furthermore, traditional solutions have limited filtration efficiency and a small effective filtration area per unit volume, making it difficult to meet the gas cleanliness requirements of modern high-performance equipment. Longer airflow paths also increase the overall system pressure drop, increasing the load on the gas source pump and reducing energy efficiency. Simultaneously, due to the multi-unit assembly, the overall aesthetics and structural consistency are poor, failing to meet the demands of modern equipment for compact layouts and clean internal structures. Therefore, existing industrial gas filtration devices have significant shortcomings in terms of space utilization, filtration efficiency, system pressure drop, ease of manufacturing and maintenance, and structural aesthetics, making it difficult to adapt to the development requirements of high-efficiency, energy-saving, and integrated pneumatic systems.

[0004] To address the aforementioned issues, this application proposes a nested dual-element stainless steel gas filter to improve industrial gas filtration efficiency, reduce energy consumption and operating costs, while ensuring the stability and reliability of the system structure. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a nested dual-filter stainless steel gas filter, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A nested dual-element stainless steel gas filter includes a housing and an inlet connector and an outlet connector coaxially disposed on both sides of the housing.

[0008] A filter element assembly is coaxially arranged inside the housing. The filter element assembly includes filter element A, filter cover A, filter element B, and filter cover B. Filter element A is coaxially arranged in the inner cavity of the housing and has a gap A between it and the inner wall of the housing. One end face of filter cover A is circumferentially welded to filter element A by argon arc welding. One end face of filter element B is circumferentially welded to filter cover A by argon arc welding. Filter cover B is circumferentially welded to the side of filter element B away from filter cover A by argon arc welding. There is a gap B between the outer surface of filter element B and the inner cavity of filter element A, which is larger than the gap A.

[0009] Optionally, the bottom of the A filter element and one end of the outlet connector are circumferentially welded by argon arc welding.

[0010] Optionally, the A filter cover is divided into an upper body and a lower body, with the overall shape being wider at the top and narrower at the bottom. The outer diameter of the upper body corresponds to the outer diameter of the A filter element, and the outer diameter of the lower body corresponds to the outer diameter of the B filter element.

[0011] Optionally, the A filter element, A filter cover, B filter element, and B filter cover are all coaxially arranged.

[0012] Optionally, the length of filter element B is shorter than that of filter element A, and there is a gap C between filter cover B and outlet connector.

[0013] This utility model provides a nested dual-filter stainless steel gas filter, which has the following advantages:

[0014] 1. This utility model provides a nested dual-element stainless steel gas filter, which achieves overall sealing through all-metal argon arc welding. This completely eliminates the aging and leakage risks caused by the use of non-metallic sealing components such as O-rings and gaskets in traditional filters. It is especially suitable for working conditions of high-purity, ultra-high vacuum or corrosive gases, ensuring long-term stable operation.

[0015] 2. This utility model provides a nested dual-filter stainless steel gas filter. Through the coaxial nested dual-filter design, it achieves large-area filtration in a compact space, with low flow resistance, high filtration efficiency, and extended service life, meeting the requirements of high precision and continuous operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] In the diagram: 1. Housing; 2. Inlet connector; 3. Outlet connector; 4. Filter element assembly; 41. Filter element A; 42. Filter cover A; 43. Filter element B; 44. Filter cover B. Detailed Implementation

[0018] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "lateral", "longitudinal", "end", "edge", "sidewall", "upper", "lower", "upper part", "lower part", "directly above", "surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "end", "head", "tail", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] This application proposes a nested dual-element stainless steel gas filter, as detailed below:

[0021] For reference Figure 1 The device mainly consists of three sets of structures: a housing 1, an inlet connector 2, and an outlet connector 3 coaxially mounted on both sides of the housing 1. Through the coordinated arrangement of these structures, airflow filtration and redirection are achieved within a single housing. The flow channel design is smoother, avoiding additional pressure loss caused by external pipelines. Simultaneously, the increased filtration area reduces the flow velocity, resulting in a significantly better overall pressure drop compared to traditional parallel systems, thereby effectively reducing the energy consumption and operating costs of the pneumatic system.

[0022] For reference Figure 1 The shell is made of stainless steel and is cylindrical in shape. Its two ends are connected to the inlet connector 2 and the outlet connector 3 by argon arc welding. After the connection, an internal air passage is formed that is connected from top to bottom.

[0023] For reference Figure 1 Inside the housing 1, a filter element assembly 4 is coaxially installed. The filter element assembly 4 is composed of filter element A 41, filter cover A 42, filter element B 43 and filter cover B 44 connected coaxially in sequence.

[0024] The filter element 41 is located in the inner cavity of the housing 1, with a gap A between it and the inner wall of the housing 1. The bottom of the filter element 41 is circumferentially welded to one end of the outlet connector 3 by argon arc welding. This design, by leaving a gap A between the filter element 41 and the housing 1 and fixing the bottom connection by argon arc welding, ensures the formation of the filtration channel and the gas guidance, and improves the stability and sealing reliability of the filter element installation. The gas entering the gap A can only be filtered by the filter element 41 and then enter the area of ​​the gap B, thereby reaching the gap C.

[0025] One end face of filter cover 42 is circumferentially welded to the end of filter element 41 by argon arc welding; one end face of filter element 43 is also circumferentially welded to the other end face of filter cover 42 by argon arc welding; filter cover 44 is circumferentially welded to the end of filter element 43 away from filter cover 42 by argon arc welding, thus forming an integrally sealed dual-stage filtration structure.

[0026] Furthermore, a gap B is provided between the outer surface of filter element B 43 and the inner cavity of filter element A 41, and gap B is larger than gap A to avoid gas stagnation caused by an excessively narrow flow channel. This ensures the stability and uniformity of the gas flowing into gap B within gap A and the inner cavity of filter element B 43 during device operation. Filter element B 44 is shorter than filter element A 41, and because the bottom of filter element A 41 is welded to one end face of the outlet connector 3, there is a gap C between filter cover B 44 and the outlet connector 3. Gap C acts as a buffer chamber or a confluence chamber. Before the gas passing through filter elements A and B converges at the outlet, gap C allows the gas to temporarily equalize pressure, slow down, or merge, thereby preventing direct erosion of the outlet connector weld and extending the structural life.

[0027] Furthermore, filter cover 42 is divided into an upper body and a lower body, which are formed by connecting two cylindrical structures with different diameters, resulting in an overall shape that is wider at the top and narrower at the bottom. Specifically, the outer diameter of the upper body corresponds to the outer diameter of filter element 41, and the outer diameter of the lower body corresponds to the outer diameter of filter element 43, so that filter element 41 and filter element 43 can be coaxial after connection, and a gap B area is reserved.

[0028] Through the above structural design, the filter element assembly 4 can form multiple filtration channels inside the housing 1. Gas passes through filter element A or filter element B from the outside to the inside and enters the gap B to complete filtration, effectively improving the filtration effect. At the same time, the coaxial sealing structure with argon arc welding circumferential seam improves the overall compressive strength and sealing reliability, avoiding problems such as filter element displacement, leakage or detachment during long-term operation, significantly extending the service life of the device and improving filtration efficiency.

[0029] In this invention, the working steps of the device are as follows:

[0030] 1. First, connect the inlet connector 2 of the device to the external air source pipeline, and connect the outlet connector 3 to the downstream pneumatic system or equipment;

[0031] 2. Next, the gas enters the interior of the housing 1 through the inlet connector 2 and enters the filter elements 43 in gaps A and B. At this time, the gas in gap A will pass through filter element 41 A and enter gap B, and flow to gap C.

[0032] 3. Then, the gas in filter element 43 will pass through filter element 43 into gap B and flow to gap C;

[0033] 4. Finally, all the gas flows to gap C, enters outlet connector 3, and is discharged after filtration.

[0034] It should be noted that in the installation and welding process, filter element B 43 is first welded to filter cover A 42. Then, filter cover B 44 is welded to the side of filter element B 43 away from filter cover A 42. Finally, filter element A 41 is welded to filter cover A 42, completing the connection of the internal filter element assembly 4. Next, the side of filter element A 41 away from filter cover B 44 is welded to one end face of the outlet connector 3. Then, housing 1 is fitted onto the outside of filter element assembly 4, forming a coaxial fit between housing 1 and filter element assembly 4. Then, one end face of housing 1 is welded and fixed to outlet connector 3 to ensure a reliable seal at the connection. Finally, inlet connector 2 is welded and installed on the end face of housing 1 away from outlet connector 3, thus completing the welding and assembly process of the entire device. This welding adopts the process sequence of "welding sub-assemblies step by step, then welding the main assembly," avoiding welding interference under complex structures, ensuring that each weld is achievable and the welding quality is reliable, thereby guaranteeing the consistency and reliability of the product.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A nested dual-element stainless steel gas filter, characterized in that: Includes a housing (1) and an inlet connector (2) and an outlet connector (3) coaxially arranged on both sides of the housing (1); The housing (1) is coaxially provided with a filter element assembly (4), which includes filter element A (41), filter cover A (42), filter element B (43) and filter cover B (44). Filter element A (41) is coaxially provided in the inner cavity of the housing (1) and there is a gap A between it and the inner wall of the housing (1). One end face of filter cover A (42) is circumferentially welded to filter element A (41) by argon arc welding. One end face of filter element B (43) is circumferentially welded to filter cover A (42) by argon arc welding. Filter cover B (44) is circumferentially welded to the side of filter element B (43) away from filter cover A (42) by argon arc welding. There is a gap B between the outer surface of filter element B (43) and the inner cavity of filter element A (41) that is greater than the gap A.

2. The nested dual-element stainless steel gas filter according to claim 1, characterized in that: The bottom of the A filter element (41) is circumferentially welded to one end of the outlet connector (3) by argon arc welding.

3. The nested dual-element stainless steel gas filter according to claim 1, characterized in that: The A filter cover (42) is divided into an upper body and a lower body, and is generally wider at the top and narrower at the bottom. The outer diameter of the upper body corresponds to the outer diameter of the A filter element (41), and the outer diameter of the lower body corresponds to the outer diameter of the B filter element (43).

4. The nested dual-element stainless steel gas filter according to claim 1, characterized in that: The A filter element (41), A filter cover (42), B filter element (43) and B filter cover (44) are all coaxially arranged.

5. The nested dual-element stainless steel gas filter according to claim 1, characterized in that: The length of filter element B (43) is shorter than that of filter element A (41), and there is a gap C between filter cover B (44) and outlet connector (3).

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