Filter layer structure and filter

Abstract

The utility model provides a filter layer structure and a filter, relates to the technical field of filter screens, and adopts the main technical scheme that the filter layer structure comprises a first filter layer and a second filter layer, and the second filter layer is arranged on the other side of the first filter layer; the N second filter layers are sequentially arranged in the direction from one side of the first filter layer to the other side of the first filter layer, and N is an integer; the second filter layer close to the first filter layer is communicated with the first filter layer, and the two second filter layers are communicated with each other. Wherein the mesh number of the meshes on the first filter layer is greater than that of the meshes on the second filter layer; and the number of meshes of the N second filter layers is gradually reduced along the direction from the first filter layer to the second filter layers. When large particles break through the first filter layer, the filter layer with the mesh aperture smaller than the particle size of the particles can be used for filtering the particles after the first filter layer, so that the purpose of improving the filtering performance of the filter is achieved. The second filter layer close to the first filter layer is communicated with the first filter layer, and the two adjacent second filter layers are communicated. The purpose that the target fluid can flow out is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter screens, and more specifically, to a filter layer structure and a filter. Background Art

[0002] Commonly used fuel gas often contains large-sized solid particles, small solid particles, and tiny droplets. Large-sized solid particles entering the combustion chamber will directly cause the burner nozzle to be blocked, and in severe cases, even cause damage to the gas turbine blades; small solid particles will also cause wear and tear on the system equipment of the gas turbine, scratch the valve sealing surface on the pipeline, and cause leakage.

[0003] In order to better protect the burner, the high-temperature fuel gas of the gas turbine must be filtered through a fuel gas filter before entering the combustion chamber to protect the normal operation of the equipment.

[0004] The filter layers of existing filters are mostly composite mesh components composed of several layers of mesh, and the mesh size of each layer increases successively from the direction of natural gas feed to the direction of natural gas discharge, so as to achieve the purpose of filtering large-sized solid particles, small solid particles, etc. in natural gas step by step.

[0005] In actual use, as the number of meshes on the layer net increases, the mechanical strength of the layer net decreases. When the layer net with a smaller mesh number is broken by particles with a larger particle size, the mechanical strength of the layer net with a larger mesh number is difficult to filter the particles with a larger particle size, which greatly reduces the filtering performance of the filter. Utility Model Content

[0006] The utility model aims to provide a filter layer structure and a filter, so that when a larger particle breaks through the first filter layer, the filter layer with a mesh aperture smaller than the particle size behind the first filter layer can be used to filter the particle, so as to improve the filtering performance of the filter.

[0007] The utility model is realized by the following technical solutions:

[0008] A filter layer structure includes a first filter layer and a second filter layer, wherein one side of the first filter layer is used to access a target fluid; the second filter layer is arranged on the other side of the first filter layer; N second filter layers are arranged in sequence from one side of the first filter layer to the other side of the first filter layer, where N is an integer; two adjacent second filter layers are connected, and the first filter layer is connected to the second filter layer, and the second filter layer away from the first filter layer is used to flow out the target fluid; wherein the mesh number of the first filter layer is greater than the mesh number of the second filter layer; and the mesh number of each of the N second filter layers gradually decreases from the first filter layer to the second filter layer.

[0009] Optionally, both the first filter layer and the second filter layer are made of woven mesh.

[0010] Optionally, the first filter layer and the second filter layer, as well as two adjacent second filter layers, are sintered.

[0011] Optionally, along the direction from the first filter layer to the second filter layer, the mesh number of the first filter layer, the mesh number of the second filter layer close to the first filter layer, and the mesh number of each second filter layer decreases step by step.

[0012] In a second aspect, a filter is provided, comprising the filter layer structure as described in the first aspect, and further comprising: a main body, wherein the main body is provided with a receiving groove, and a feed port is provided at one end of the receiving groove; the filter layer structure is provided on the wall of the receiving groove; in the filter layer structure on the wall of the receiving groove, a second filter layer away from the first filter layer is connected to the wall of the receiving groove; the filter layer structure on the wall of the receiving groove is arranged around the wall of the receiving groove, so that the first filter layer of the filter layer structure on the wall of the receiving groove forms a filter cavity; the wall of the receiving groove is provided with a first guide hole, and the first guide hole is connected to the second filter layer in the filter layer structure on the wall of the receiving groove, away from the first filter layer.

[0013] Optionally, the filter layer structure is provided at the bottom of the receiving tank; in the filter layer structure on the bottom of the receiving tank, a second filter layer away from the first filter layer is connected to the bottom of the receiving tank; a second guide hole is provided at the bottom of the receiving tank, and the second guide hole is connected to the second filter layer in the filter layer structure on the bottom of the receiving tank, away from the first filter layer; and the filter cavity is formed between the first filter layer on the bottom of the receiving tank and the first filter layer on the wall of the receiving tank.

[0014] Optionally, in the filter layer structure on the receiving tank wall, the second filter layer away from the first filter layer and the receiving tank wall, and in the filter layer structure on the receiving tank bottom, the second filter layer away from the first filter layer and the receiving tank bottom are both welded.

[0015] Optionally, the filter further includes a connecting flange; the connecting flange is provided with a flow channel; the connecting flange is connected to the feed port, and one end of the flow channel is connected to the filter cavity; the other end of the flow channel is used to access the target fluid.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] ① When a larger particle breaks through the first filter layer, the particle can be filtered by the filter layer behind the first filter layer whose mesh size is smaller than that of the particle, so as to improve the filtering performance of the filter.

[0018] ② The first filter layer and N second filter layers are arranged in sequence, and the second filter layer close to the first filter layer is connected to the first filter layer and the two adjacent second filter layers, so as to achieve the purpose of allowing the target fluid to flow through the first filter layer and the Nth second filter layer in sequence and then flow out. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 is a schematic diagram of a filter layer structure in Example 1;

[0021] Figure 2 This is a schematic diagram of the structure of a filter in Example 2;

[0022] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0023] Figure 4 A schematic structural diagram of a filter body in an embodiment.

[0024] Marks and corresponding parts names in the attached drawings:

[0025] 1-filter layer structure; 101-first filter layer; 102-second filter layer;

[0026] 201-main body; 202-accommodating groove; 203-feeding port; 204-first flow guide hole; 205-second flow guide hole; 206-connecting flange; 207-flow channel; 208-filter chamber. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0028] Example 1

[0029] Mesh refers to the number of holes per square inch on the sieve. 50 mesh means 50 holes per square inch, 500 mesh means 500 holes per square inch. The higher the mesh number, the more holes there are. In addition to indicating the holes in the sieve, it is also used to indicate the particle size that can pass through the sieve. The higher the mesh number, the smaller the particle size.

[0030] The filter layer of the existing filter is mostly a composite mesh component composed of several layers of mesh, and the mesh number of each layer of mesh increases in sequence along the direction from natural gas feed to natural gas discharge. As the mesh number of the layer increases, the mechanical strength of the layer decreases. At the same time, the larger the particle size, the greater the impact force on the filter layer. When the layer of mesh with a smaller mesh number is broken by the particle with a larger particle size, the mechanical strength of the layer of mesh with a larger mesh number is difficult to filter the particle with a larger particle size, which greatly reduces the filtering performance of the filter.

[0031] Therefore, this embodiment provides a filter layer structure 1, such as Figure 1 As shown, it includes a first filter layer 101 and a second filter layer 102 .

[0032] There are N second filter layers 102 , where N is an integer. That is, the filter layer structure 1 at least includes the first filter layer 101 and one second filter layer 102 .

[0033] The first filter layer 101 and the N second filter layers 102 are arranged in sequence, and the upper holes of the second filter layer 102 close to the first filter layer 101 are connected to the upper holes of the first filter layer 101, and the upper holes of two adjacent second filter layers 102 are connected. That is to say, the upper holes of the first second filter layer 102 are connected to the upper holes of the first filter layer 101, and the upper holes of the second second filter layer 102 are connected to the upper holes of the first second filter layer 102, and so on, until the N-1 second filter layer 102 is connected to the N second filter layer 102. Among them, the end of the upper hole of the first filter layer 101 away from the second filter layer 102 is used to access the target fluid, and the end of the upper hole of the N second filter layer 102 away from the first filter layer 101 is used to flow out the target fluid, and the target fluid can be a gas fuel such as natural gas, artificial gas, liquefied petroleum gas, biogas, coal gas, etc. Through this structure, the target fluid can flow through the first filter layer 101 and the N second filter layer 102 in sequence and then flow out.

[0034] Among them, the mesh number of the first filter layer is greater than the mesh number of the second filter layer; and the mesh number of each second filter layer 102 gradually decreases from the first filter layer 101 to the second filter layer 102. For example, when N is 1, the mesh number of the first filter layer 101 is 60 meshes, and the mesh number of the second filter layer 102 is 20 meshes. When N is 2, the mesh number of the first filter layer 101 is 60 meshes, the mesh number of the first second filter layer 102 is 40 meshes, and the mesh number of the second third filter layer is 20 meshes. In other words, in the filter layer structure 1, the first filter layer 101 has the largest mesh number and the smallest mechanical strength, and the Nth second filter layer 102 has the smallest mesh number and the largest mechanical strength. And along the direction from the first filter layer 101 to the Nth second filter layer 102, the mechanical strength of each filter layer gradually increases. With this structure, when a larger particle breaks through the first filter layer 101, the particle can be filtered by the filter layer behind the first filter layer 101 whose mesh size is smaller than the particle size, so as to improve the filtering performance of the filter.

[0035] Exemplary, in order to extend the service life of the filter layer. In this embodiment, the first filter layer 101 and the second filter layer 102 both use a woven net as a filter medium, and the woven nets of different materials (such as stainless steel wire, polyester fiber, nylon, etc.) and specifications (mesh number, wire diameter) can be selected according to the properties of the target fluid and the size of the impurity particles contained. The filter layer uses a precise weaving process to ensure that the mesh number of each filter layer gradually decreases along the direction from the first filter layer 101 to the second filter layer 102, and the adjacent filter layers are seamlessly connected or fixedly installed to ensure that the target fluid can continuously and smoothly pass through the filter layers at all levels. Through this structure, on the one hand, the good strength and toughness of the woven net structure, as well as the wear resistance and pressure resistance, are suitable for long-term fluid pressure and impact characteristics, so as to achieve the purpose of extending the service life of the filter layer. On the other hand, the woven net can be relatively easy to clean and replace. When a certain filter layer is blocked, only the woven net of the corresponding level needs to be replaced, which reduces the maintenance cost.

[0036] Exemplarily, in order to improve the stability of the connection between each filter layer. In this embodiment, the first filter layer 101 and the second filter layer 102, and the two adjacent second filter layers 102 are connected and fixed by a sintering process. During the implementation process, first, the filter layers are stacked neatly according to the designed mesh number sequence. Then, under specific temperature and atmosphere conditions, the contact surface between the two adjacent layers is subjected to high-temperature sintering treatment, so that the two adjacent filter layers are mutually melted or undergo physical and chemical reactions to form a strong bond.

[0037] Through this structure, at least the following beneficial effects are achieved:

[0038] ① The connection formed after sintering has high mechanical strength and can withstand large pressure differences without deformation or rupture, ensuring the stable operation of the filter under high pressure conditions.

[0039] ② The sintering process makes the combination of multiple filter layers tighter, avoiding the loosening or separation of the filter layers caused by vibration, impact and other factors, thereby improving the stability of the entire filter structure.

[0040] ③The sintering process can complete the connection between multiple filter layers at one time, simplifying the production process and reducing production costs.

[0041] ④ During the sintering process, it can be ensured that there are no gaps between the filter layers, which enhances the sealing performance of the overall structure, effectively prevents the unfiltered fluid from leaking through the layers, and improves the filtering accuracy.

[0042] ⑤ Sintering can improve the surface properties of the material and enhance its corrosion resistance, which is particularly beneficial for applications that require filtering corrosive fluids. At the same time, due to the toughness and sealing of the sintered layer, failures caused by particle penetration or filter layer wear are reduced, extending the service life of the filter.

[0043] Exemplarily, in order to achieve the purpose of effective graded filtration of particles that break through the first filter layer 101 in the target fluid. In this embodiment, along the direction from the first filter layer 101 to the adjacent two second filter layers 102, the mesh number of the mesh holes on the first filter layer 101, the mesh number of the mesh holes on the first second filter layer 102 to the mesh number of the mesh holes on the Nth second filter layer 102 decreases in sequence. For example, when N is 1, the mesh number of the first filter layer 101 is 60 meshes, and the mesh number of the second filter layer 102 is 20 meshes. When 2 is 3, the mesh number of the first filter layer 101 is 60 meshes, the mesh number of the first second filter layer 102 is 40 meshes, and the mesh number of the second second filter layer 102 is 20 meshes. During the implementation, when particles with a larger particle size break through the first filter layer 101, they are filtered and intercepted by the second filter layer 102, which has a smaller mesh number than the first filter layer 101 and a smaller mesh size than the particle size; when the second filter layer 102 is broken through, they are filtered and intercepted by the third filter layer, which has a smaller mesh number than the second filter layer 102 and a smaller mesh size than the particle size; and so on. Through this structure, the design of the mesh number that decreases step by step can effectively filter the particles with larger particle sizes in the target fluid, thereby significantly improving the overall filtering performance.

[0044] Example 2

[0045] This embodiment provides a filter such as Figure 2-Figure 4 As shown, it comprises the filter layer structure 1 and the main body 201 as described in Embodiment 1.

[0046] The main body 201 is provided with a receiving groove 202, which is used to carry and fix the filter layer structure 1, and a feed port 203 is provided at one end of the receiving groove 202, so as to facilitate the target fluid to enter the filter cavity 208. The filter layer structure 1 is arranged around the groove wall of the receiving groove 202 to form a filtering area of ​​a closed-loop structure. In the filter layer structure 1, the second filter layer 102 away from the first filter layer 101 is directly connected to the groove wall of the receiving groove 202 to ensure that the structure is stable and has good sealing. The inner wall of the first filter layer 101 is surrounded by the filter cavity 208, so that the target fluid entering the feed port 203 is first filtered through the first filter layer 101, and then passes through each filter layer in turn along the direction from the first filter layer 101 to the groove wall of the receiving groove 202. A first flow guide hole 204 is provided on the wall of the receiving groove 202. The first flow guide hole 204 is connected to the mesh hole on the second filter layer 102 (i.e., the Nth second filter layer with the smallest mesh number) in the filter layer structure 1, which is far away from the first filter layer 101, so that the filtered fluid can flow out smoothly. Through this structure, on the one hand, the filter layer structure 1 is tightly embedded in the receiving groove 202, ensuring the stability of the overall equipment and the continuity of the filtering process. On the other hand, the design of the first flow guide hole 204 helps to guide the target fluid to smoothly complete the entire filtering process.

[0047] For example, Figure 2 Combination Figure 3 As shown, in order to improve the filtering efficiency of the filter. In this embodiment, a filter layer structure 1 identical to the wall of the accommodating tank 202 is also provided at the bottom of the accommodating tank 202. In the filter layer structure 1 on the bottom of the accommodating tank 202, the second filter layer 102 away from the first filter layer 101 is directly fixed to the bottom of the accommodating tank 202, and the first filter layer 101 of the filter layer structure 1 on the bottom of the accommodating tank 202 cooperates with the first filter layer 101 on the wall of the accommodating tank 202 to form a three-dimensional filter chamber 208. After the fluid enters the feed port 203, it will fully contact each first filter layer 101 in the filter chamber 208 to achieve a full-range and efficient filtering process. In addition, a second guide hole 205 is provided at the bottom of the accommodating tank, and the second guide hole 205 is connected to the mesh hole on the second filter layer 102 away from the first filter layer 101 in the filter layer structure 1 on the bottom of the accommodating tank 202. That is to say, the target fluid can flow out through the second guide hole 205 on the bottom of the accommodating groove 202. Through this structure, on the one hand, during the filtering process, the target fluid not only passes through the filter layer structure 1 from the side (groove wall), but also can be filtered from top to bottom through the filter layer structure 1 at the bottom of the groove in multiple directions and in a three-dimensional manner. This is to increase the filtering area and contact time, and improve the filtering efficiency per unit volume. On the other hand, the second guide hole 205 is provided to facilitate the smooth discharge of the filtered target fluid, effectively avoiding the phenomenon of backflow or retention.

[0048] Exemplarily, in order to improve the stability of the overall structure of the filter. In this embodiment, welding technology is used to connect the second filter layer 102 on the wall of the receiving groove 202, away from the first filter layer 101, and the second filter layer 102 on the bottom of the receiving groove 202, away from the first filter layer 101, is connected to the bottom of the receiving groove 202. During the implementation process, the second filter layer 102 (i.e., the Nth second filter layer with the least mesh number) in one filter layer structure 1, away from the first filter layer 101, is first accurately placed at a preset position on the wall of the receiving groove 202, and the second filter layer 102 in another filter layer structure 1, away from the first filter layer 101, is accurately placed at a preset position on the bottom of the receiving groove 202. Next, use a suitable welding process (such as resistance welding, laser welding, argon arc welding, etc.) to ensure that in the filter layer structure 1, the second filter layer 102 away from the first filter layer 101 forms a seamless and tight combination with the groove wall and groove bottom of the accommodating groove 202, thereby ensuring its stability during operation and preventing the fluid that has not been fully filtered from leaking from the interface. Through this structure, on the one hand, the welding process makes the overall structure of the filter more stable, can withstand higher working pressures, and extend the service life of the equipment. On the other hand, since the welded fixed filter layer is not easy to loosen or shift, the failure rate caused by structural problems is reduced, simplifying the subsequent maintenance and replacement work. On the other hand, for filters that need to work in high temperature, high pressure or corrosive environments, high-quality welding processes can ensure the reliability of the filter structure under harsh conditions.

[0049] For example, Figure 2As shown, in order to facilitate the connection of the filter with other equipment or pipeline systems. In the present embodiment, the filter also includes a connecting flange 206, and at least one flow channel 207 is arranged on the connecting flange 206. The connecting flange 206 is installed on the feed port 203 on the filter body 201, so that one end of the flow channel 207 can be directly connected to the filter chamber 208 through the feed port 203. In actual use, the target fluid can enter the filter through the other end of the flow channel 207. For example, the external pipeline system is docked with the feed port 203 of the filter using the connecting flange 206, ensuring that the connection is sealed reliably, and the target fluid enters the filter chamber 208 through the flow channel 207 on the connecting flange 206, and then flows out through the first filter layer 101, each second filter layer 102, the first guide hole 204 on the main body 201, and the first guide hole 204, completing the entire filtering process. Through this structure, on the one hand, the filter is easy to be quickly and firmly connected and disassembled with other equipment or pipeline systems through the connecting flange 206, simplifying the installation and maintenance work. On the other hand, the flow channel 207 on the flange can more accurately control the direction and speed of the target fluid, ensuring that it enters the filter chamber 208 evenly and efficiently, thereby improving the filtration efficiency. On the other hand, the sealed connection between the connecting flange 206 and the feed port 203 reduces the risk of leakage and ensures the working performance and safety of the filter.

[0050] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A filter layer structure, characterized in that: include: A first filter layer (101), one side of the first filter layer (101) being used for receiving a target fluid; a second filter layer (102), the second filter layer (102) being arranged on the other side of the first filter layer (101); N second filter layers (102) are arranged in sequence from one side of the first filter layer (101) to the other side of the first filter layer (101), N being an integer; two adjacent second filter layers (102) are connected, and the first filter layer (101) is connected to the second filter layer (102), and the second filter layer (102) far away from the first filter layer (101) is used to flow out the target fluid; The mesh number of the first filter layer (101) is greater than the mesh number of the second filter layer (102); and the mesh number of each of the N second filter layers (102) gradually decreases along the direction from the first filter layer (101) to the second filter layer (102).

2. The filter layer structure according to claim 1, characterized in that: The first filter layer (101) and the second filter layer (102) are both made of woven mesh.

3. The filter layer structure according to claim 1, characterized in that: The first filter layer (101) and the second filter layer (102), as well as two adjacent second filter layers (102), are sintered.

4. The filter layer structure according to claim 1, characterized in that: Along the direction from the first filter layer (101) to the second filter layer (102), the number of mesh holes on the first filter layer (101), the number of mesh holes on the second filter layer (102) close to the first filter layer (101), and the number of mesh holes on the second filter layers (102) decrease step by step.

5. A filter comprising the filter layer structure according to any one of claims 1 to 4, characterized in that: Also includes: A main body (201), wherein the main body (201) is provided with a receiving groove (202), and a feed port (203) is provided at one end of the receiving groove (202); the filter layer structure (1) is provided on the groove wall of the receiving groove (202); in the filter layer structure (1) on the groove wall of the receiving groove (202), a second filter layer (102) away from the first filter layer (101) is connected to the groove wall of the receiving groove (202); the filter layer structure (1) on the groove wall of the receiving groove (202) is arranged around the groove wall of the receiving groove (202), so that the first filter layer (101) of the filter layer structure (1) on the groove wall of the receiving groove (202) forms a filter cavity (208); The groove wall of the containing groove (202) is provided with a first flow guide hole (204), and the first flow guide hole (204) is connected to a second filter layer (102) in the filter layer structure (1) on the groove wall of the containing groove (202) and away from the first filter layer (101).

6. The filter according to claim 5, characterized in that: The bottom of the containing tank (202) is provided with the filtering layer structure (1); In the filter layer structure (1) on the bottom of the containing tank (202), a second filter layer (102) away from the first filter layer (101) is connected to the bottom of the containing tank (202); A second flow guide hole (205) is provided at the bottom of the accommodating groove (202), and the second flow guide hole (205) is connected to a second filter layer (102) in the filter layer structure (1) on the bottom of the accommodating groove (202) and away from the first filter layer (101); Furthermore, the filter cavity (208) is formed between the first filter layer (101) on the bottom of the containing groove (202) and the first filter layer (101) on the wall of the containing groove (202).

7. The filter according to claim 6, characterized in that: In the filter layer structure (1) on the wall of the containing groove (202), the second filter layer (102) away from the first filter layer (101) and the wall of the containing groove (202), and in the filter layer structure (1) on the bottom of the containing groove (202), the second filter layer (102) away from the first filter layer (101) and the bottom of the containing groove (202) are all welded.

8. The filter according to claim 5, characterized in that: Also includes a connecting flange (206); The connecting flange (206) is provided with a flow channel (207); The connecting flange (206) is connected to the feed port (203), and one end of the flow channel (207) is in communication with the filter cavity (208); the other end of the flow channel (207) is used to access the target fluid.

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