Gas two-stage filter

Abstract

The utility model discloses a gas two-stage filter which comprises a filter shell and a filter element, the filter element is installed inside the filter shell, a first filter assembly and a second filter assembly are arranged inside the filter element, a filter element upper butt-joint opening is fixed above the filter element in a threaded mode, and a filter element lower butt-joint opening is fixed below the filter element. A lower filter element clamping groove plate is arranged on the lower portion in the filter shell, a lower filter element clamping groove plate groove is formed in the upper portion of the lower filter element clamping groove plate, a lower filter element butt joint opening is fixedly installed in the lower filter element clamping groove plate groove, an upper filter element clamping groove plate and a filter top cover are sequentially arranged on the upper portion of the filter shell, and an upper filter element clamping groove plate groove is formed in the lower portion of the upper filter element clamping groove plate. The filter top cover is spirally fixed above the filter shell, the middle part of the side surface of the filter shell is provided with an air inlet, the bottom of the filter shell is provided with a drain outlet, and the bottom of the side surface of the filter shell is provided with an air outlet.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a two-stage gas filter. Background Technology

[0002] Gas filters are widely used and crucial in industrial production and laboratory environments. Their primary function is to remove dust, particulate matter, and other impurities from gases to ensure gas purity and protect the safety and efficiency of downstream equipment and processes. However, during prolonged operation, gas filters inevitably accumulate significant amounts of dust and impurities. These contaminants gradually deposit on or inside the filter media, reducing the effective filtration area and ultimately causing filter clogging.

[0003] The direct consequence of filter clogging is a significant decrease in gas flux. This not only affects the gas supply to the entire system but can also lead to decreased equipment performance and even equipment failure. For example, in semiconductor manufacturing, insufficient or unstable gas supply can result in reduced product quality; in chemical production, reduced gas flux can affect reaction rates and yields.

[0004] More seriously, if filters fail to remove impurities effectively and promptly, secondary pollution may occur. Secondary pollution not only reduces gas purity but may also introduce new harmful substances, posing a potential threat to products and the environment. For example, in the biopharmaceutical field, secondary pollution can lead to drug contamination, affecting the safety and efficacy of pharmaceuticals.

[0005] Therefore, in the current fields of industrial production and environmental protection, there is an urgent need to develop a filtration device with high-efficiency filtration performance, durability, and ease of quick cleaning and replacement. This device should not only meet the requirements of long-term continuous operation but also maintain stable filtration performance when faced with complex and variable industrial emissions. Furthermore, to adapt to rapidly changing production environments and improve work efficiency, the design of this filtration device should consider ease of operation, enabling maintenance personnel to quickly complete cleaning and replacement tasks, thereby reducing equipment downtime and improving overall production efficiency. In terms of environmental protection, the high-efficiency filtration capacity of this device can significantly reduce the emission of harmful substances, which is of great significance for improving air quality and protecting the ecological environment. Therefore, developing such a filtration device can not only improve the economic benefits of industrial production but also promote sustainable environmental development. Utility Model Content

[0006] The purpose of this invention is to solve the problems mentioned in the background art and to propose a two-stage gas filter. The filter element of the device disclosed in this invention is provided with a first filter component and a second filter component, which not only improves the filtration rate and filtration effect, but also enhances the durability of the filter element. Through the upper filter element slot plate and the lower filter element slot plate, the filter element can be quickly installed and removed, enabling maintenance personnel to quickly complete the cleaning and replacement of the filter element, thereby reducing equipment downtime and improving overall production efficiency.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A two-stage gas filter includes a filter housing and a filter element. The filter element is installed inside the filter housing. A first filter assembly and a second filter assembly are disposed inside the filter element. An upper filter element connector is threaded onto the top of the filter element, and a lower filter element connector is fixed to the bottom of the filter element. A lower filter element retaining plate is disposed at the bottom inside the filter housing, and a groove is disposed above the lower filter element retaining plate. The lower filter element connector is installed and fixed inside the groove. An upper filter element retaining plate and a filter top cover are sequentially disposed on the top of the filter housing. A groove is disposed below the upper filter element retaining plate, and the upper filter element connector is installed and fixed inside the groove. The filter top cover is screwed onto the top of the filter housing. An air inlet is disposed in the middle of the side of the filter housing, and a drain outlet is disposed at the bottom of the filter housing. An air outlet is disposed at the bottom of the side of the filter housing. An air outlet channel is disposed below the lower filter element retaining plate, and the air outlet channel is connected to an internal channel of the filter element. The air outlet channel and the air outlet channel are interconnected.

[0009] Preferably, the inner diameter of the upper interface of the filter element is equal to the outer diameter of the lower interface of the filter element, and the upper interface and the lower interface of the filter element cooperate to form a filter element connector.

[0010] Preferably, a first sealing gasket is provided on the bottom surface of the groove below the top cover of the filter, a second sealing gasket is provided on the bottom surface of the groove below the groove of the upper filter element slot plate, a third sealing gasket is provided inside the upper interface of the filter element, and a fourth sealing gasket is provided on the bottom and side surfaces of the groove of the lower filter element slot plate.

[0011] Preferably, the filter element has threads on the outer side of the interface, and the filter element also includes a sealing cap, which is rotatably fixed above the interface on the filter element.

[0012] Preferably, the filter element further includes a filter element cover and a filter element first housing, with threads provided on the upper outer side of the filter element first housing, and the filter element cover screwed onto the upper part of the filter element first housing.

[0013] Preferably, a first filter element housing is provided on the outside of the first filter assembly, and a first buffer gap is provided between the first filter element housing and the first filter assembly; a second filter element housing is provided on the inside of the second filter assembly, and a second buffer gap is provided between the second filter assembly and the second filter element housing; a filter element buffer space is provided between the first filter assembly and the second filter assembly.

[0014] Preferably, a first magnet is disposed below the first filter assembly and the second filter assembly, and a second magnet is disposed above the bottom shell of the filter element, the first magnet and the second magnet being magnetically attracted together; two first fixing holes are disposed above the first filter assembly and two second fixing holes are disposed below it; two third fixing holes are disposed above the second filter assembly and two fourth fixing holes are disposed below it; two fifth fixing holes are disposed above the first outer shell of the filter element and two sixth fixing holes are disposed below it; two seventh fixing holes are disposed above the second outer shell of the filter element and two eighth fixing holes are disposed below it; the first fixing holes, third fixing holes, fifth fixing holes and seventh fixing holes are axially symmetrical, the second fixing holes, fourth fixing holes, sixth fixing holes and eighth fixing holes are axially symmetrical; the first outer shell of the filter element, the first filter assembly, the second filter assembly and the second outer shell of the filter element are fixed by fixing pins.

[0015] Preferably, the first filter assembly includes a first nylon mesh, a first filter mesh, and a second nylon mesh arranged in sequence, with a first gap between the first nylon mesh and the first filter mesh, and a second gap between the first filter mesh and the second nylon mesh; the second filter assembly includes a third nylon mesh, a second filter mesh, and a fourth nylon mesh arranged in sequence, with a third gap between the third nylon mesh and the second filter mesh, and a fourth gap between the second filter mesh and the fourth nylon mesh.

[0016] Preferably, an air outlet channel is provided below the groove of the lower filter element slot plate, and a gas buffer area is provided below the lower filter element slot plate. The upper part of the gas buffer area is connected in series with the air outlet channel, and the side of the gas buffer area is connected in series with the air outlet.

[0017] Preferably, a support column is fixedly installed below the lower filter element slot plate, and the support column is fixed above the bottom surface inside the filter housing.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. The filter element of the device disclosed in this utility model is provided with a first filter component and a second filter component, which not only improves the filtration rate and filtration effect, but also enhances the durability of the filter element; the filter element can be quickly installed and removed through the upper filter element slot plate and the lower filter element slot plate, so that maintenance personnel can quickly complete the cleaning and replacement of the filter element, thereby reducing equipment downtime and improving overall production efficiency.

[0020] 2. The filter element upper interface and filter element lower interface in the device disclosed in this utility model are combined to form a filter element connector, and the filter elements can be stacked to increase the filtration space and improve the filtration rate of the device.

[0021] 3. The device disclosed in this utility model has sealing gaskets between the filter top cover and the filter element, between the filter elements, and between the filter element and the groove of the lower filter element slot plate, so as to achieve internal sealing of the device and thereby improve the filtration performance and efficiency of the device.

[0022] 4. The filter element in the device disclosed in this utility model is equipped with a sealing cover. After the filter element in the device is blocked, it is removed and the lower filter element can be covered with the sealing cover, so that other filter elements can quickly reach the working state. It is convenient and quick and will not affect production.

[0023] 5. The filter element in the device disclosed in this utility model is provided with a filter element cover, which allows the first and second filter components inside the filter element to be quickly removed and installed, facilitating filter element cleaning, thereby improving the working efficiency of the device and reducing costs.

[0024] 6. The filter element in the device disclosed in this utility model has a buffer gap between the first outer shell of the filter element, the first filter component, the second filter component and the second outer shell of the filter element, so that the filter element has a larger gas flow rate. At the same time, the buffer gap can redistribute the airflow direction and prevent the flow deviation caused by the uneven distribution of the pore size of the filter material.

[0025] 7. The filter element in the device disclosed in this utility model has a first filter component and a second filter component fixed to the bottom by magnets, and the top is fixed by fixing pins passing through the first fixing hole, the second fixing hole, the third fixing hole and the fourth fixing hole in sequence. The structure is simple and the installation is convenient.

[0026] 8. The filter element in the device disclosed in this utility model has nylon meshes respectively provided on both sides of the first filter screen and the second filter screen, which serves to protect the first filter screen and the second filter screen. At the same time, there are gaps between the first filter screen, the second filter screen and the nylon mesh, allowing the filter screen to have a certain deformation space, preventing the filter screen from being damaged due to excessive pressure.

[0027] 9. The lower filter element slot plate (7) of the device disclosed in this utility model is provided with a gas buffer area, so that the filtered gas is discharged stably and continuously. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the device disclosed in this utility model;

[0029] Figure 2 This is a longitudinal sectional view of the filter element of the device disclosed in this utility model;

[0030] Figure 3 This is a cross-sectional view of the filter element of the device disclosed in this utility model;

[0031] Figure 4 The device disclosed in this utility model is attached Figure 2 Enlarged view of a portion of point A inside.

[0032] The components are as follows: 1. Filter top cover; 2. First sealing gasket; 3. Upper filter element slot plate; 31. Upper filter element slot plate groove; 4. Filter housing; 5. Filter element; 51. Filter element top cover; 52. Filter element upper interface; 53. Filter element lower interface; 54. Filter element first housing; 55. First filter assembly; 551. First nylon mesh; 552. First filter screen; 553. Second nylon mesh; 56. Second filter assembly; 561. Third nylon mesh; 562. Second filter screen; 563. Fourth nylon mesh; 57. Filter element second housing; 58. Filter element buffer space; 59. First buffer gap; 510. Second buffer gap; 6. Air inlet; 7. Lower filter element slot plate; 71. Lower filter element slot plate groove; 8. Drain outlet; 9. Air outlet; 10. Air outlet channel; 11. Support column; 12. Gas buffer area. Detailed Implementation

[0033] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] like Figures 1-4As shown, a two-stage gas filter includes a filter housing 4 and a filter element 5. The filter element 5 is installed inside the filter housing 4. A first filter assembly 55 and a second filter assembly 56 are arranged inside the filter element 5. The two sets of filter assemblies achieve graded filtration. Larger impurities are blocked outside the first filter assembly 55, while smaller impurities are blocked outside the second filter assembly 56, preventing a large amount of impurities from clogging the filter element 5 and improving its durability. An upper filter element interface 52 is threaded onto the top of the filter element 5. The upper filter element interface 52 is fixed by screw rotation and is detachable, facilitating the opening of the filter element 5 for cleaning and impurity removal. A lower filter element interface 53 is fixed at the bottom of the filter element 5. A lower filter element slot plate 7 is provided at the bottom inside the filter housing 4, and a lower filter element slot plate groove 71 is provided above the lower filter element slot plate 7. The lower filter element interface 53 is installed and fixed inside the lower filter element slot plate groove 71. Upper filter element slots are sequentially arranged on the top of the filter housing 4. The filter housing consists of a plate 3 and a filter top cover 1. The upper filter element slot plate 3 has a groove 31 below it. The upper filter element interface 52 is installed and fixed within the groove 31. The filter element 5 is securely fixed by the cooperation of the lower filter element interface 53 and the groove 71, as well as the upper filter element interface 52 and the groove 31. The filter top cover 1 is screwed onto the filter housing 4. The filter housing 4 has an air inlet 6 in the middle of its side, a drain outlet 8 at its bottom, and an air outlet 9 at its bottom side. An air outlet channel 10 is located below the lower filter element slot plate 7, connecting to the internal channel of the filter element 5. The air outlet 9 and the air outlet channel 10 are interconnected. The flow path of the filtered gas is: air inlet 6—filter element 5—air outlet channel 10—air outlet 9. The drain outlet 8 communicates with the space between the filter housing 4 and the filter element 5, discharging the impurities initially filtered by the filter element 5.

[0035] like Figure 2 As shown, the inner diameter of the upper interface 52 of the filter element is equal to the outer diameter of the lower interface 53 of the filter element. The upper interface 52 and the lower interface 53 of the filter element cooperate to form a filter element connector. Through the structure described in this paragraph, the filter elements 5 can be arranged in an overlapping manner to improve the filtration efficiency of the device.

[0036] like Figure 1 As shown, a first sealing gasket 2 is provided on the bottom surface of the groove below the filter top cover 1, a second sealing gasket is provided on the bottom surface of the groove below the upper filter element slot plate groove 31, a third sealing gasket is provided inside the filter element upper interface 52, and a fourth sealing gasket is provided on the bottom and side surfaces of the lower filter element slot plate groove 71. By providing sealing gaskets between the various components in the device, the airtightness between the components is good, preventing gas crossflow and affecting the quality of the filtered gas.

[0037] like Figure 2As shown, the filter element has threads on the outer side of the interface 52. The filter element 5 also includes a sealing cap. The sealing cap is rotatably fixed above the interface 52 on the filter element. When one of the filter elements 5 in the device is blocked, it can be removed and the sealing cap can be used to seal the filter element 5 below it. The device can continue to work and operate, avoiding the impact of filter element 5 blockage on the device operation and improving production efficiency.

[0038] The filter element 5 also includes a filter element cover 51 and a filter element first housing 54. The filter element first housing 54 has a thread on its upper outer side. The filter element cover 51 is screwed and fixed on the upper part of the filter element first housing 54. The filter element cover 51 of the filter element 5 is detachable, which facilitates cleaning of the first filter component 55 and the second filter component 56 of the filter element 5. This not only improves the cleaning efficiency of the filter element 5, but also avoids the filter element 5 being used only once, thus reducing costs.

[0039] like Figure 3 As shown, a first filter element housing 54 is provided on the outside of the first filter assembly 55, and a first buffer gap 59 is provided between the first filter element housing 54 and the first filter assembly 55; a second filter element housing 57 is provided on the inside of the second filter assembly 56, and a second buffer gap 510 is provided between the second filter assembly 56 and the second filter element housing 57. By providing the first buffer gap 59 and the second buffer gap 510, deformation space is provided for the first filter assembly 55 and the second filter assembly 56, so as to avoid damage to the first filter assembly 55 and the second filter assembly 56 due to excessive gas flow rate; a filter element buffer space 58 is provided between the first filter assembly 55 and the second filter assembly 56 to increase the flow rate of the filter element 5. At the same time, the filter element buffer space 58 can also redistribute the airflow direction to prevent the flow deviation phenomenon caused by uneven pore size distribution of the filter material.

[0040] In Example 2, a first magnet is provided below the first filter assembly 55 and the second filter assembly 56, and a second magnet is provided on the bottom shell of the filter element 5. The first magnet and the second magnet are magnetically attracted together, ensuring that the first filter assembly 55 and the second filter assembly 56 can extend into the bottom of the filter element 5. Two first fixing holes are provided above the first filter assembly 55, and two second fixing holes are provided below it. Two third fixing holes are provided above the second filter assembly 56, and two fourth fixing holes are provided below it. Two fifth fixing holes are provided above the first outer shell 54 of the filter element, and two sixth fixing holes are provided below it. Two seventh fixing holes are provided above the second outer shell 57 of the filter element, and two eighth fixing holes are provided below it. The first fixing holes, third fixing holes, fifth fixing holes, and seventh fixing holes are axially symmetrical, as are the second fixing holes, fourth fixing holes, sixth fixing holes, and eighth fixing holes. The first outer shell 54, the first filter assembly 55, the second filter assembly 56, and the second outer shell 57 of the filter element are fixed by fixing pins. Through the above structure, the first filter assembly 55 and the second filter assembly 56 are fixed in a suitable position inside the filter element 5.

[0041] like Figure 4 As shown, the first filter assembly 55 includes a first nylon mesh 551, a first filter mesh 552, and a second nylon mesh 553 arranged sequentially. A first gap is provided between the first nylon mesh 551 and the first filter mesh 552, and a second gap is provided between the first filter mesh 552 and the second nylon mesh 553. The second filter assembly 56 includes a third nylon mesh 561, a second filter mesh 562, and a fourth nylon mesh 563 arranged sequentially. A third gap is provided between the third nylon mesh 561 and the second filter mesh 562, and a fourth gap is provided between the second filter mesh 562 and the fourth nylon mesh 563. Nylon mesh is provided on both sides of 62 to protect the first filter screen 552 and the second filter screen 562 from damage by external forces. At the same time, gaps are provided between the first filter screen 552 and the second filter screen 562 and the nylon mesh to allow the filter material a certain deformation space and prevent damage to the filter material due to excessive pressure. The pore size of the first filter screen 552 is between 10 and 500 μm. The first nylon mesh 551 and the second nylon mesh 553 are nylon mesh with a mesh size of 30 to 80. The pore size of the second filter screen 562 is between 100 nm and 3000 nm. The third nylon mesh 561 and the fourth nylon mesh 563 are nylon mesh with a mesh size of 100 to 300.

[0042] like Figure 1As shown, an air outlet channel 10 is provided below the groove 71 of the lower filter element slot plate 7, and a gas buffer zone 12 is provided below the lower filter element slot plate 7. The upper part of the gas buffer zone 12 is connected in series with the air outlet channel 10, and the side of the gas buffer zone 12 is connected in series with the air outlet 9. The gas buffer zone 12 enables the filtered gas to be output stably and continuously.

[0043] A support column 11 is fixedly installed below the lower filter element slot plate 7, and the support column 11 is fixed above the bottom surface inside the filter housing 4.

[0044] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0045] The above description represents the preferred operating mode of this utility model. The specific operating mode description is only for better understanding the concept of this utility model. For those skilled in the art, several improvements or equivalent substitutions can be made based on the principles of this utility model, and these improvements or equivalent substitutions are also considered to fall within the protection scope of this utility model.

Claims

1. A gas two-stage filter comprising a filter housing (4) and a filter cartridge (5) mounted inside the filter housing (4), characterized in that: The filter core (5) is internally provided with a first filter assembly (55) and a second filter assembly (56), the filter core (5) is threadedly fixed with an upper filter core connecting interface (52) above, the filter core (5) is fixed with a lower filter core connecting interface (53) below, the filter housing (4) is internally provided with a lower filter core clamping groove plate (7) below, the lower filter core clamping groove plate (7) is provided with a lower filter core clamping groove plate groove (71) above, the lower filter core connecting interface (53) is fixedly installed in the lower filter core clamping groove plate groove (71), the filter housing (4) is sequentially provided with an upper filter core clamping groove plate (3) and a filter top cover (1) above, the upper filter core clamping groove plate (3) is provided with an upper filter core clamping groove plate groove (31) below, the upper filter core connecting interface (52) is fixedly installed in the upper filter core clamping groove plate groove (31), the filter top cover (1) is screw-fixed on the filter housing (4) above, the filter housing (4) is provided with an air inlet (6) in the middle of the side surface, the filter housing (4) is provided with a blowdown port (8) at the bottom, the filter housing (4) is provided with an air outlet (9) at the bottom of the side surface, the lower filter core clamping groove plate (7) is provided with an air outlet channel (10) below, the air outlet channel (10) is connected with the internal channel of the filter core (5), and the air outlet (9) and the air outlet channel (10) are communicated.

2. The gas two-stage filter according to claim 1, wherein: The inner diameter of the filter core upper connecting interface (52) is equal to the outer diameter of the filter core lower connecting interface (53), and the filter core upper connecting interface (52) and the filter core lower connecting interface (53) are matched to form a filter core connecting piece.

3. The dual-stage gas filter of claim 1, wherein: The bottom surface of the groove below the filter top cover (1) is provided with a first sealing gasket (2), the bottom surface of the groove below the upper filter core clamping groove plate groove (31) is provided with a second sealing gasket, the inside of the filter core upper connecting interface (52) is provided with a third sealing gasket, and the bottom surface and the side surface of the lower filter core clamping groove plate groove (71) are both provided with a fourth sealing gasket.

4. The dual-stage gas filter of claim 1, wherein: The outer side surface of the filter core upper connecting interface (52) is provided with threads, and the filter core (5) further comprises a sealing cover, which is rotationally fixed above the filter core upper connecting interface (52).

5. The dual-stage gas filter of claim 1, wherein: The filter core (5) further comprises a filter core upper cover (51) and a filter core first housing (54), the outer side surface of the filter core first housing (54) is provided with threads above, and the filter core upper cover (51) is screw-fixed above the filter core first housing (54).

6. The gas two-stage filter of claim 5, wherein: The outer side surface of the first filter assembly (55) is provided with a filter core first housing (54), a first buffer gap (59) is formed between the filter core first housing (54) and the first filter assembly (55), the inner side surface of the second filter assembly (56) is provided with a filter core second housing (57), a second buffer gap (510) is formed between the second filter assembly (56) and the filter core second housing (57), and a filter core buffer space (58) is formed between the first filter assembly (55) and the second filter assembly (56).

7. The gas two-stage filter of claim 6, wherein: The first filter assembly (55) and the second filter assembly (56) are provided below a first magnet, the filter core (5) bottom shell is provided above a second magnet, the first magnet and the second magnet are magnetically attracted together; the first filter assembly (55) is provided above two first fixing holes, and is provided below two second fixing holes, the second filter assembly (56) is provided above two third fixing holes, and is provided below two fourth fixing holes, the filter core first shell (54) is provided above two fifth fixing holes, and is provided below two sixth fixing holes, the filter core second shell (57) is provided above two seventh fixing holes, and is provided below two eighth fixing holes, the first fixing hole, the third fixing hole, the low fifth fixing hole and the seventh fixing hole are axially symmetrical, the second fixing hole, the fourth fixing hole, the sixth fixing hole and the eighth fixing hole are axially symmetrical, and the filter core first shell (54), the first filter assembly (55), the second filter assembly (56) and the filter core second shell (57) are fixed by fixing pins.

8. The dual-stage gas filter of claim 1, wherein: The first filter assembly (55) comprises a first nylon net (551), a first filter net (552) and a second nylon net (553) arranged in sequence, a first gap is arranged between the first nylon net (551) and the first filter net (552), and a second gap is arranged between the first filter net (552) and the second nylon net (553); the second filter assembly (56) comprises a third nylon net (561), a second filter net (562) and a fourth nylon net (563) arranged in sequence, a third gap is arranged between the third nylon net (561) and the second filter net (562), and a fourth gap is arranged between the second filter net (562) and the fourth nylon net (563).

9. The dual-stage gas filter of claim 1, wherein: The lower filter core clamping groove plate (7) is provided below the lower filter core clamping groove plate groove (71) with an air outlet channel (10), the lower filter core clamping groove plate (7) is provided below with a gas buffer area (12), the gas buffer area (12) is connected with the air outlet channel (10) in series, and the gas buffer area (12) is connected with the air outlet (9) in series.

10. The dual-stage gas filter of claim 1, wherein: The lower filter core clamping groove plate (7) is fixedly provided below with a supporting column (11), and the supporting column (11) is fixedly arranged above the inner bottom surface of the filter housing (4).

Images