A frameless natural gas filter element structure and installation and fixing method

Abstract

A frameless natural gas filter element structure and installation and fixing method belong to the field of mechanical technology. The upper end cover of the filter element is a blind cover, the lower end cover of the filter element is a circular opening, the lower end cover has a sealing ring groove, the sealing ring groove is connected to the O-ring, the upper end surface of the lower end cover has a lower bonding groove, the lower end cover and the filter layer are bonded together, the lower end cover is connected to the core seat, the upper end cover of the filter element includes a handle, an end cover and a filter element positioning plate, the handle is connected to the filter element positioning plate, the other side of the filter element positioning plate is connected to the end cover, the lower end surface of the upper end cover has an upper bonding groove, the upper end cover is hot-melt bonded to the filter layer through the upper bonding groove, the tube plate is connected to the branch pipe, the outer circumference of the other end of the branch pipe is connected to the core seat and the frame, the inner cavity of the other end of the branch pipe is connected to the rear support rib plate, the central screw hole of the rear support rib plate is connected to the pull rod, the inner cavity of the frame is connected to the front support rib plate, the central circular hole of the front support rib plate is connected to the other end of the pull rod, and the central connecting pull rod is connected to the front support rib plate through a fastening nut.

Description

Technical Field

[0001] The invention relates to a frameless natural gas filter element structure and an installation and fixing method thereof, belonging to the technical field of machinery. Background Art

[0002] Natural gas filter separators are widely used in long-distance natural gas pipelines. They are mainly used to remove solid dust impurities and large droplets in natural gas. They play a very important role in protecting important equipment such as compressors, gas turbines and flow meters. The filter separator is equipped with a large number of natural gas filter elements, which are key units for intercepting dust and removing impurities. After the natural gas filter element has been used for a period of time and reaches the replacement pressure difference, the filter element needs to be replaced. Therefore, natural gas station maintenance personnel need to replace the filter element every year.

[0003] The existing natural gas filter separator filter element structure and installation and fixing method mainly have the following problems:

[0004] The filter element of the natural gas filter separator needs to be replaced regularly. The replaced filter element carries a large amount of dust and condensate oil due to filtering natural gas, so it belongs to hazardous waste pollutants and cannot be disposed of at will. It must be handled by a professional hazardous waste recycling company. Hazardous waste recycling companies charge according to the weight of hazardous waste. The more hazardous waste, the higher the recycling fee. Taking the natural gas filter element as an example, it is mainly composed of end caps, skeletons and filter layers. The end caps and skeletons are both made of stainless steel, and the weight accounts for more than 60% of the weight of the entire filter element. Moreover, due to the metal skeleton and end cap, the filter element cannot be directly incinerated after recycling, and the metal components must be removed in advance, so the processing cost is extremely high. The National Pipeline Network Company currently replaces about 10,000 filter elements each year, and with the later construction of the pipeline network, the annual replacement of filter elements will increase. Such a large amount of hazardous waste treatment each year is not only a high cost expenditure and waste of resources for the pipeline network company, but also bears huge social pressure. Therefore, a new product form is urgently needed to effectively solve such problems. The frameless natural gas filter element and its installation and fixing form developed by the present invention can significantly reduce the annual generation of hazardous waste, effectively reduce processing costs, and avoid repeated waste of resources.

[0005] The structure and installation method of existing natural gas filter elements have many sealing points, which means there are also many leakage risk points. The filter element of the natural gas filter separator needs to be replaced regularly. The installation structure and method of the existing filter element make it very labor-intensive to remove and install the filter element each time, which requires a lot of work and time for on-site maintenance personnel.

[0006] The existing filter element structure and installation method have three sealing leakage risk points, namely the sealing surface between the filter element lower end cover and the core seat, the sealing surface between the filter element upper end cover and the gland, and the seal between the gland and the rubber pad. Since the filter element as a whole needs to be fixed by a bracket, it is difficult to ensure that the opening on the bracket is completely coaxial with the filter element and the pull rod during the processing, which will cause leakage risks at the above three points. Summary of the invention

[0007] In order to overcome the deficiencies of the prior art, the present invention provides a frameless natural gas filter element structure and an installation and fixing method.

[0008] The present invention aims to solve the problems of high cost and serious waste of resources in the post-processing of natural gas filter elements. A new type of natural gas filter element structure and installation and fixing method is developed. At the same time, all components of the filter element are made of polymer materials. While ensuring the filtering accuracy and strength of the filter element, the weight of the filter element is reduced to the maximum extent, the amount of hazardous waste to be processed in the later stage is reduced, and the processing cost is reduced. At the same time, since the filter element has no metal components, it can be directly incinerated and the waste of resources can be reduced.

[0009] The filter element and the installation and fixing structure of the present invention can effectively reduce the sealing points and reduce the risk of leakage. The present invention can effectively reduce the workload when replacing the filter element, and the replacement time is also greatly shortened.

[0010] A skeleton-free natural gas filter element structure, the filter element consists of an upper end cover, a lower end cover and a filter layer, the upper end cover of the filter element is a blind cover form, the lower end cover of the filter element is a circular opening form, the lower end cover is provided with a sealing ring groove, the sealing ring groove is connected to the O-ring, the upper end surface of the lower end cover is provided with a lower bonding groove, the lower end cover and the filter layer are bonded to the lower end cover, the lower end cover is connected to the core seat, the upper end cover of the filter element comprises a handle, an end cover and a filter element positioning plate, the handle is connected to the filter element positioning plate, the other side of the filter element positioning plate is connected to the end cover, the lower end surface of the upper end cover is provided with an upper bonding groove, the upper end cover is hot-melt bonded to the filter layer through the upper bonding groove, the tube plate is connected to the branch pipe, the outer circumference of the other end of the branch pipe is connected to the core seat and the frame, the inner cavity of the other end of the branch pipe is connected to the rear support rib plate, the central screw hole of the rear support rib plate is connected to the pull rod, the inner cavity of the frame is connected to the front support rib plate, the central circular hole of the front support rib plate is connected to the other end of the pull rod, and the central connecting pull rod is connected to the front support rib plate through a fastening nut.

[0011] The filter layer of the filter element is a tubular structure of a polyester fiber tube formed by hot-melt bonding of multiple layers of polyester fiber non-woven fabrics. The inner circle of the core seat is the sealing surface with the filter element O-ring, and the inner circle of the port on one side of the core seat is the welding surface with the branch pipe. The outer circumference of the branch pipe has a first step and a second step. The first step is connected to the skeleton, and the second step is connected to the core seat. The skeleton is divided into a left end and a right end. The port parts of the left end and the right end of the skeleton are non-porous areas, and there are porous areas between the non-porous areas. The inner cavity of the core seat is connected to the O-ring, one end of the filter layer is connected to the core seat, the other end of the filter layer is connected to the upper end cover, and the bracket is connected to the filter element positioning plate.

[0012] A method for installing and fixing a frameless natural gas filter element structure includes the following steps: using a natural gas filter element without a metal frame as a support layer, the entire filter element is made of polymer plastic material, the upper end cover and the filter layer are hot-melt bonded in a blind cover form, the sealing ring groove is used to install an O-ring, and the lower bonding groove bonds the lower end cover and the filter layer.

[0013] The filter element adopts a structure with a blind cover at one end and an O-ring radial seal at the other end. The core seat adopts an annular through-hole structure. The inner diameter of the tube is determined according to the size of the O-ring. During the installation of the filter element, the O-ring is squeezed by the tube wall to form a seal.

[0014] During installation, first fix one end of the tie rod to the rear supporting rib plate through a thread, and then pass the right end of the frame through the tie rod and fix it to the first step of the branch pipe. The first step has a positioning and supporting function for the frame. During the installation of the frame, the tie rod passes through the round hole of the front supporting rib plate at the left end of the frame, and then is locked with an anti-loosening nut. After the nut is locked, the frame can be horizontal and firmly installed under the support and fixing action of the tie rod and branch pipe.

[0015] It also contains the following steps:

[0016] The branch pipe is welded to the tube sheet, the core seat is welded to the branch pipe, and the frame is fixed to the branch pipe through tie rods and supporting ribs. When installing a frameless filter element, insert the through hole end of the filter element along the frame so that the lower end cover of the filter element enters the core seat. The O-ring on the lower end cover is squeezed by the inner wall of the core seat to form a compression seal.

[0017] Compared with the existing natural gas filter element structure and installation and fixing form, the present invention has the following advantages:

[0018] 1. The natural gas skeleton-free filter element of the present invention has no metal skeleton inside. The metal support skeleton originally inside the filter element is moved to the inner part of the filter separator core seat, so that it can be used for a long time instead of a one-time use while ensuring that the support function remains unchanged. The filter element has no metal skeleton, and the end cover is made of polymer plastic material. The weight of the filter element is greatly reduced, which greatly reduces the amount of hazardous waste in the later stage, and can be directly incinerated, which greatly reduces the user's hazardous waste treatment cost. At the same time, the metal skeleton can be used for a long time. Calculated by replacing 10,000 filter elements each year, the waste of metal skeleton resources is greatly reduced.

[0019] 2. The new filter element structure and installation method are adopted. Compared with the original structure, the risk points of sealing leakage are reduced from three to one, and the sealing reliability is greatly improved.

[0020] 3. The workload of installing and removing the natural gas filter element is greatly reduced. When installing the filter element with the original structure, each filter element needs to be tightened twice with the nut, and the overall bracket needs to be fixed and locked at the same time. When removing the filter element, the workload is the same. When installing the filter element with the new structure, due to the use of a blind hole at one end and an O-ring radial seal at the other end, the workload of tightening the nut twice for each filter element is omitted. Only the overall bracket needs to be fixed and locked, which reduces the workload by more than 90%, greatly reduces the labor intensity, and can achieve rapid installation and removal of the filter element.

[0021] The natural gas filter element structure and installation and fixing method of the present invention can effectively reduce the sealing points and reduce the risk of leakage, and will not affect the filter element seal during the bracket installation process. The natural gas filter element structure and installation and fixing method of the present invention can effectively reduce the workload when replacing the filter element. The filter element installation and removal are simple and quick, which can save a lot of labor costs. At the same time, no accessories such as metal washers and rubber pads are required, which reduces maintenance and operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] When considered in conjunction with the accompanying drawings, the present invention can be more completely and better understood and many of the accompanying advantages can be easily known by referring to the detailed description below, but the drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention, as shown in the figure:

[0023] Figure 1 It is a schematic diagram of the structure of the natural gas filter element of the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the upper end cover of the filter element of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the lower end cover of the filter element of the present invention.

[0026] Figure 4 It is a schematic diagram of the core seat and frame fixing structure of the present invention.

[0027] Figure 5 It is a schematic diagram of the core seat structure of the present invention.

[0028] Figure 6 It is a schematic diagram of the branch pipe structure of the present invention.

[0029] Figure 7 It is a schematic diagram of the skeleton structure of the present invention.

[0030] Figure 8 It is a schematic diagram of the framework installation structure of the present invention.

[0031] Fig. 9 It is a schematic diagram of the natural gas frameless filter element and its installation and fixing structure of the present invention.

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0033] Obviously, many modifications and changes made by those skilled in the art based on the purpose of the present invention belong to the protection scope of the present invention.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0035] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art.

[0037] To facilitate the understanding of the embodiments, further explanations will be given below, and each embodiment does not constitute a limitation on the embodiments of the utility model.

[0038] Embodiment 1: A skeleton-free natural gas filter element structure, such as Figure 1As shown, the filter element is mainly composed of an upper end cover 1, a lower end cover 2 and a filter layer 3. The upper end cover 1 of the filter element is a blind cover, and the upper part of the upper end cover 1 is provided with a handle 5; the lower end cover 2 of the filter element is a circular opening, and the lower end cover 2 has a sealing ring groove 8, and the sealing ring groove 8 is connected to the O-ring 4.

[0039] The filter element is sealed in the form of an O-ring 4 radial seal.

[0040] The upper end cover 1 and the lower end cover 2 are both made of polymer plastics through injection molding, and this material can be directly incinerated.

[0041] The filter layer 3 of the filter element is a tubular structure of a polyester fiber tube formed by hot-melt bonding of multiple layers of polyester fiber non-woven fabrics. While ensuring the filtering accuracy, the polyester fiber tube also has a certain rigidity and strength, good roundness, and is not easy to deform. When purifying natural gas, the direction of natural gas flowing through the filter element is from outside to inside.

[0042] like Figure 2 As shown, the upper end cover 1 of the filter element includes a handle 5, an end cover and a filter element positioning plate 6. The handle 5 is connected to the filter element positioning plate 6, and the other side of the filter element positioning plate 6 is connected to the end cover.

[0043] The handle 5 ensures the convenience of personnel operation when installing and removing the filter element. The lower end surface of the upper end cover 1 is provided with an upper bonding groove 29. The upper end cover 1 is hot-melt bonded to the filter layer 3 (polyester fiber tube) through the upper bonding groove 29. It is a blind cover form, which reduces one sealing leakage point compared with the existing natural gas filter element.

[0044] The function of the filter element positioning plate 6 is to provide a positioning point for fixing the filter element to the bracket as a whole, that is, on the bracket 28, corresponding to each filter element opening, the center of each filter element opening is coaxial with the center of the filter element positioning plate 6.

[0045] like Figure 3 As shown, the lower end cover 2 is a circular opening, and the lower end cover 2 has a sealing ring groove 8, and the sealing ring groove 8 is connected to the O-ring 4. The upper end surface of the lower end cover 2 has a lower bonding groove 7, and the lower bonding groove 7 is used to bond the lower end cover 2 and the filter layer 3 (polyester fiber tube). The lower end cover 2 is connected to the core seat 11, and the O-ring 4 is the only sealing point in the entire filter element installation and fixing structure.

[0046] like Figure 4 and Figure 8As shown, a schematic diagram of the core seat and frame fixing structure, the tube sheet 9 is connected to the branch pipe 10, the outer circumference of the other end of the branch pipe 10 is connected to the core seat 11 and the frame 12, the inner cavity of the other end of the branch pipe 10 is connected to the rear support rib 17, the central screw hole 18 of the rear support rib 17 is connected to the tie rod 15, the inner cavity of the frame 12 is connected to the front support rib 13, the central circular hole 24 of the front support rib 13 is connected to the other end of the tie rod 15, and the central connecting tie rod 15 is connected to the front support rib 13 through an anti-loosening nut 14.

[0047] The support plate 21 is an L-shaped ring support on the inner wall of the frame 12 .

[0048] like Figure 5 As shown, the inner circle of the core seat 11 is the sealing surface 16 with the filter element O-ring, and the inner circle of one side port of the core seat 11 is the welding surface with the branch pipe 10.

[0049] like Figure 6 As shown, the outer circumference of the branch pipe 10 has a first step 19 and a second step 20 , the first step 19 is connected to the frame 12 , and the second step 20 is connected to the core seat 11 .

[0050] like Figure 7 As shown, the skeleton 12 is divided into a skeleton left end 22 and a skeleton right end 23. The end portions of the skeleton left end 22 and the skeleton right end 23 are both non-porous areas 27. The non-porous areas 27 are between the porous areas 26.

[0051] like Fig. 9 As shown, the natural gas skeleton-free filter element and its installation and fixing structure, the inner cavity of the core seat 11 is connected to the O-ring 4, one end of the filter layer 3 is connected to the core seat 11, and the other end of the filter layer 3 is connected to the upper end cover 1. The bracket 28 is connected to the filter element positioning plate 6.

[0052] Embodiment 2: A skeleton-free natural gas filter element structure, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown in the figure, the structure of the natural gas filter element and its installation and fixing method mainly include the structural form of the natural gas filter element, the installation and fixing form of the core seat and the frame, and the structural form of the bracket fixing.

[0053] A natural gas filter element structure, the filter element mainly consists of an upper end cover 1, a lower end cover 2 and a filter layer 3. The upper end cover 1 of the filter element is a blind cover with a handle 5 on the upper part; the lower end cover 2 is a circular opening with a sealing ring groove 8 for installing an O-ring 4.

[0054] The filter element is sealed in the form of radial sealing with an O-ring 4. The upper end cover 1 and the lower end cover 2 are made of polymer plastics by injection molding. This material can be directly incinerated. The filter layer 3 of the filter element is a fiber tube structure formed by hot-melt bonding of multiple layers of polyester fiber non-woven fabrics. While ensuring the filtering accuracy, the polyester fiber tube also has a certain rigidity and strength, good roundness, and is not easy to deform.

[0055] When purifying natural gas, the direction in which natural gas flows through the filter element is from outside to inside.

[0056] The biggest difference from the existing natural gas filter element structure is that the natural gas filter element of the present invention does not have a metal skeleton as a supporting layer. The structural strength of the filter element will be guaranteed by the metal skeleton installed on the core seat. The entire filter element is made of polymer plastic material and can be directly incinerated after recycling. At the same time, the weight of the filter element of the present invention is greatly reduced, only 40% of the weight of the original filter element, and the amount of hazardous waste in the later stage will be greatly reduced, which effectively reduces the processing cost and also reduces the waste of resources.

[0057] The upper end cover 1 of the filter element is mainly composed of a handle 5, an end cover and a filter element positioning plate 6. The handle 5 is mainly used to ensure the convenience of personnel operation when installing and removing the filter element; the upper end cover 1 is hot-melt bonded to the filter layer 3 (polyester fiber tube) in the form of a blind cover, which reduces a sealing leakage point compared to the existing natural gas filter element; the filter element positioning plate 6 is used to provide a positioning point for the bracket to fix the filter element as a whole, that is, on the bracket, a hole is opened corresponding to each filter element, the center of the hole is coaxial with the center of the filter element positioning plate, and the diameter of the hole is between the maximum circle and the minimum circle diameter of the positioning plate.

[0058] The lower end cover 2 is a circular opening with a sealing ring groove 8 for installing an O-ring. The lower bonding groove 7 is used to bond the lower end cover 2 and the filter layer (polyester fiber tube) 3. The lower end cover 2 is connected to the core seat 11, and the O-ring 4 is the only sealing point in the entire filter element installation and fixing structure.

[0059] The filter element seat and frame fixing structure of the present invention are completely different from the existing filter element seat and fixing installation form.

[0060] First, the core seat 11 is designed according to the new filter element structure. The new filter element adopts a blind cover at one end and an O-ring radial seal at the other end. Therefore, the new core seat also changes the original waterline seal form and adopts an annular through-hole structure. The inner diameter of the tube is determined according to the size of the O-ring. During the process of installing the filter element, the O-ring is squeezed by the tube wall to form a seal.

[0061] Secondly, the biggest difference between the structure of the present invention and the existing structure is that the skeleton originally installed in the filter element is creatively replaced by a core seat structure installed in the filter separator, so that the skeleton is changed from being used once to being used for a long time or permanently.

[0062] The skeleton 12 of the filter element mainly supports the filter layer 3 and ensures that the filter element is not crushed. When the filter element needs to be replaced, only the filter layer 3 has reached its service life and cannot meet the filtering accuracy requirements and needs to be replaced, while the skeleton 12 is made of stainless steel and has not failed and can still be used.

[0063] However, the existing filter element and installation fixing structure form determine that even if the frame can continue to be used, it can only be replaced together with the filter element, resulting in a huge waste of resources.

[0064] The present invention transfers the skeleton 12 from the filter element to the core seat structure, which ensures its support function and can be used for a long time, thus avoiding waste of resources. Even if the skeleton 12 needs to be replaced after long-term use, the structure of the present invention can also easily replace the skeleton 12.

[0065] The core seat of the present invention is an annular through-hole structure, made of carbon steel or stainless steel, and is mainly used to achieve the positioning and fixing of the filter element. The annular surface with a larger diameter is the sealing surface with the natural gas filter element O-ring, and its diameter size is determined according to the size of the O-ring used, and the sealing surface is required to have a certain degree of finish. The end with a smaller diameter is welded to the branch pipe, and the welding is full welding to ensure the sealing performance while also ensuring the verticality requirement with the branch pipe.

[0066] The branch pipe 10 of the present invention is mainly used to fix the core seat 11 and the frame 12. The branch pipe 10 is generally a thick-walled seamless steel pipe, which is welded on the tube sheet 9. Before welding, the branch pipe 10 needs to be processed. First, two sets of step structures are processed. The first step 19 is used to position and support the frame 12, and the second step 20 is used to position the core seat 11. Figure 6 As shown, the outer circumference of the branch pipe 10 has a first step 19 and a second step 20, the first step 19 is connected to the frame 12, and the second step 20 is connected to the core seat 11. ) At the same time, a rear support rib plate 17 with a certain thickness is welded inside the branch pipe 10, and a screw hole 18 is opened in the center of the rear support rib plate 17 for fixing the pull rod 15.

[0067] The skeleton 12 of the present invention is a metal steel pipe formed by spiral welding of perforated stainless steel strips. Its thickness can ensure the pressure-bearing requirements of the working conditions, and its length meets the support requirements of the overall filter layer of the natural gas filter element. A non-porous area of ​​a certain height is provided at both ends of the skeleton to ensure that the end faces of the skeleton are flush. The skeleton 12 is divided into a skeleton left end 22 and a skeleton right end 23. Near the skeleton left end 22, a support plate 21 with a certain thickness is welded inside the skeleton, and a circular hole is opened at the center of the support plate 21 to ensure that the pull rod 15 can pass through. This circular hole should be coaxial and concentric with the threaded hole 18 of the rear support rib plate 17 on the branch pipe 10.

[0068] During installation, one end of the tie rod 15 is first fixed to the rear support rib 17 by threading, and then the right end 23 of the frame is passed through the tie rod 15 and fixed to the first step 19 of the branch pipe 10. The first step 19 has a positioning and supporting function for the frame 12. During the installation of the frame 12, the tie rod 15 passes through the round hole of the front support rib 13 at the left end 22 of the frame, and then is locked by the anti-loosening nut 14. After the anti-loosening nut 14 is locked, the frame 12 can be horizontally installed and firmly installed under the support and fixing of the tie rod 15 and the branch pipe 10.

[0069] This structural design successfully transfers the skeleton from the inside of the natural gas filter element to the internal parts of the natural gas filter separator. The supporting function has not changed, but it has changed from being a one-time use to being able to be used for a long time, effectively saving resources and reducing material waste.

[0070] Embodiment 3: A method for installing and fixing a frameless natural gas filter element structure. The frameless natural gas filter element and its overall installation and fixing structure mainly include a branch pipe, a core seat, a frame, a filter element and a bracket. It contains the following steps:

[0071] The upper end cover 1 and the lower end cover 2 are made of polymer plastics and are processed by injection molding. The filter layer 3 of the filter element is a fiber tube structure formed by hot-melt bonding of multiple layers of polyester fiber non-woven fabrics. When purifying natural gas, the direction of natural gas flowing through the filter element is from outside to inside.

[0072] The natural gas filter element has no metal skeleton as the supporting layer. The entire filter element is made of polymer plastic. The upper end cover 1 is hot-melt bonded to the filter layer 3, which is a blind cover. The sealing ring groove 8 is used to install the O-ring. The lower bonding groove 7 is used to bond the lower end cover 2 and the filter layer (polyester fiber tube) 3.

[0073] The filter element adopts a blind cover at one end and an O-ring radial seal at the other end. The core seat adopts an annular through-hole structure, and the inner diameter of the tube is determined according to the size of the O-ring. During the installation of the filter element, the O-ring is squeezed by the tube wall to form a seal.

[0074] The skeleton is installed on the core seat structure in the filter separator. The structure of the core seat is an annular through-hole structure. The material is carbon steel or stainless steel. It is mainly used to realize the positioning and fixation of the filter element. The annular surface with a larger diameter is the sealing surface with the natural gas filter element O-ring. Its diameter size is determined according to the size of the O-ring used. The end with a smaller diameter is welded to the branch pipe. The welding is full welding to ensure the sealing while also ensuring the verticality requirement with the branch pipe.

[0075] The branch pipe 10 is a thick-walled seamless steel pipe welded on the tube sheet 9. The frame 12 of the present invention is a metal steel pipe formed by spiral welding of perforated stainless steel strips, and a certain distance of non-porous areas are provided at both ends of the frame to ensure that the end faces of the frame are flush.

[0076] During installation, one end of the tie rod 15 is first fixed to the rear support rib 17 by threading, and then the right end 23 of the frame is passed through the tie rod 15 and fixed to the first step 19 of the branch pipe 10. The first step 19 has a positioning and supporting function for the frame 12. During the installation of the frame 12, the tie rod 15 passes through the round hole of the front support rib 13 at the left end 22 of the frame, and then is locked by the anti-loosening nut 14. After the anti-loosening nut 14 is locked, the frame 12 can be horizontally installed and firmly installed under the support and fixing of the tie rod 15 and the branch pipe 10.

[0077] The branch pipe 10 is welded to the tube sheet, the core seat 11 is welded to the branch pipe 10, and the frame 12 is fixed to the branch pipe 10 through the tie rod 15 and the supporting rib plate. When installing the frameless filter element, insert the through hole end of the filter element along the frame, so that the lower end cover of the filter element enters the core seat, and the O-ring on the lower end cover is squeezed by the inner wall of the core seat to form a compression seal.

[0078] The skeleton installed on the branch pipe goes all the way to the bottom of the upper end cover, forming a support for the entire filter layer. Since the skeleton 12 is in a horizontal state and has good rigidity, the skeleton-free filter element remains horizontal after being inserted into the skeleton 12. After the overall installation of the natural gas skeleton-free filter element is completed, the filter element is fixed by a bracket. The bracket 28 is a circular tube plate, on which holes are opened according to the arrangement of the filter element and the size of the filter element positioning plate of the upper end cover. After the upper end cover of the filter element is inserted into the bracket 28 as a whole, the bracket 28 is fixed to the cylinder wall of the filter separator. After the bracket is fixed, the filter element will not be displaced front and back, up and down, left and right.

[0079] As described above, the embodiments of the present invention are described in detail, but it is obvious to those skilled in the art that many variations are possible as long as they do not deviate from the inventive point and effect of the present invention. Therefore, all such variations are also included in the protection scope of the present invention.

Claims

1. A method for installing and fixing a skeleton-free natural gas filter element structure, the filter element is composed of an upper end cover, a lower end cover and a filter layer, the upper end cover of the filter element is a blind cover, the lower end cover of the filter element is a circular opening, the lower end cover has a sealing ring groove, the sealing ring groove is connected to the O-ring, the upper end face of the lower end cover has a lower bonding groove, the lower end cover and the filter layer are bonded together by the lower bonding groove, the lower end cover is connected to the core seat, the upper end cover of the filter element includes a handle, an end cover and a filter element positioning plate, the handle is connected to the filter element positioning plate, the other side of the filter element positioning plate is connected to the end cover, the lower end face of the upper end cover has an upper bonding groove, the upper end cover is hot-melt bonded to the filter layer through the upper bonding groove, the tube sheet is connected to the branch pipe, the outer circumference of the other end of the branch pipe is connected to the core seat and the frame, the inner cavity of the other end of the branch pipe is connected to the rear support rib plate, the central screw hole of the rear support rib plate is connected to the pull Rod, the inner cavity of the skeleton is connected to the front supporting rib plate, the central circular hole of the front supporting rib plate is connected to the other end of the pull rod, the central connecting pull rod is connected to the front supporting rib plate through a fastening nut, the filter layer of the filter element is a tubular structure of a polyester fiber tube formed by hot-melt bonding of multiple layers of polyester fiber non-woven fabrics, the inner circle of the core seat is the sealing surface with the filter element O-ring, the inner circle of one side port of the core seat is the welding surface with the branch pipe, the outer circumference of the branch pipe has a first step and a second step, the first step is connected to the skeleton, and the second step is connected to the core seat, the skeleton is divided into a left end of the skeleton and a right end of the skeleton, the port parts of the left end and the right end of the skeleton are both non-porous areas, and there are porous areas between the non-porous areas, the inner cavity of the core seat is connected to the O-ring, one end of the filter layer is connected to the core seat, the other end of the filter layer is connected to the upper end cover, the bracket is connected to the filter element positioning plate, It is characterized in that The following steps are included: using a natural gas filter element without a metal skeleton as a support layer, the entire filter element is made of polymer plastic material, the upper end cover is hot-melt bonded to the filter layer, and is a blind cover form, the sealing ring groove is used to install the O-ring, and the lower bonding groove is bonded to the lower end cover and the filter layer. The filter element adopts a structure with a blind cover at one end and an O-ring radial seal at the other end. The core seat adopts an annular through-hole structure. The inner diameter of the tube is determined according to the size of the O-ring. During the installation of the filter element, the O-ring is squeezed by the tube wall to form a seal. During installation, first fix one end of the tie rod to the rear supporting rib plate through threads, and then pass the right end of the frame through the tie rod and fix it to the first step of the branch pipe. The first step has a positioning and supporting function for the frame. During the installation of the frame, the tie rod passes through the round hole of the front supporting rib plate at the left end of the frame, and then is locked with an anti-loosening nut. After the nut is locked, the frame can be horizontal and firmly installed under the support and fixing action of the tie rod and branch pipe.

2. The method for installing and fixing a frameless natural gas filter element structure according to claim 1, characterized in that: The method comprises the following steps: the branch pipe is welded to the tube plate, the core seat is welded to the branch pipe, the frame is fixed to the branch pipe by a pull rod and a supporting rib plate, and when installing a frameless filter element, the through hole end of the filter element is inserted along the frame so that the lower end cover of the filter element enters the core seat, and the O-ring on the lower end cover is squeezed by the inner wall of the core seat to form a compression seal.

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