Maintenance hole structure of deep filter cylinder and production and assembly method

Abstract

The invention discloses a maintenance hole structure of a deep filtering cylinder. The maintenance hole structure comprises a fixing piece, a maintenance hole body with a bolt, a sealing ring and a maintenance hole cover, the maintenance hole body is bonded at the position of the maintenance hole by means of the fixing piece which is bonded on the inner wall of the cylinder body in advance, and a plurality of bolts are arranged on the outward side of the maintenance hole body in advance, so that the condition that the edge is easy to break due to the fact that a screw rod through hole is formed is avoided, the production efficiency can be improved, and the yield can also be improved; moreover, as the fixing piece cannot be exposed out of the inner container of the cylinder body, the fixing piece cannot interfere with subsequent uniform laying of fibers, meanwhile, the fixing piece cannot be limited by the size of a neck opening in the upper portion of the cylinder body, the maintenance hole can be enlarged, the larger maintenance hole facilitates subsequent installation and maintenance of a filtering system in the cylinder body by workers, and therefore the maintenance efficiency is greatly improved. According to the invention, the structure is simpler and more reasonable, the production is simpler, the efficiency is higher, and the installation and maintenance of the filtering system are facilitated.

Description

Technical Field

[0001] The present invention relates to a swimming pool filter tank made of glass fiber reinforced plastic, in particular to a relatively narrow but relatively high and deep filter tank. Background Art

[0002] The production of a FRP swimming pool filter body mainly includes the following steps: 1. Separately inject the upper and lower parts of the inner tank; 2. Wrap the upper and lower parts together; 3. Wind fiber to strengthen the body; 4. Install the filtration system; 5. Pressure test to meet the pressure requirements of the filter tank.

[0003] We know that some fiberglass swimming pool filters are relatively wide, while others are relatively narrow and deep. The former often allows maintenance workers to enter through the neck of the tank for maintenance; the latter cannot allow workers to enter through the neck for maintenance. Currently, narrow and deep fiberglass swimming pool filters (referred to as deep filters) have the following characteristics: 1. The cylinder body diameter is small (less than 1000mm), and people cannot enter the cylinder for operation and maintenance; 2. The cylinder body is high (greater than 1200mm) and the system needs to be installed inside (the manpower is not long enough); 3. The cylinder body is made of fiberglass (unlike stainless steel or carbon steel, which can be welded externally); 4. The cylinder body is used for quartz sand filter and there is a certain operating pressure.

[0004] The fiberglass deep filter tank described above needs to have a maintenance hole at the lower part of the side wall of the tank body so that maintenance workers can reach in to repair the quartz sand filter, etc., and then perform maintenance through the maintenance hole when necessary; the maintenance hole is then sealed with a detachable maintenance hole structure.

[0005] Currently, the structure of the deep filter tank is as follows Figures 1 to 4 As shown, the maintenance hole structure mainly includes a maintenance hole body 100, a sealing ring 200, a cylinder wall gasket 300, a sealing ring 400, a maintenance hole cover 500 and multiple sets of bolts 600 each with a sealing ring 900. After the cylinder body 700 reaches the above-mentioned third step, the following steps are changed: 4. Open a maintenance hole 701 and drill multiple bolt holes 702 around the maintenance hole 701, such as Figure 3 As shown, at this time, since the screw hole 702 and the maintenance hole 701 are close to each other, the edge is easily broken when drilling the bolt hole 702. Therefore, the processing requirements for drilling the bolt hole 702 are high, the efficiency is low, and the qualified rate is low; 5. Insert the maintenance hole 100 through the top neck opening 703. It can be seen that the maintenance hole 100 must be smaller than the top neck opening 703 to fit into the cylinder body 700. Therefore, the size of the maintenance hole 701 is limited by the size of the neck opening 703. However, since the cylinder body 700 of the deep filter cylinder is relatively thin, the maintenance hole 701 cannot be opened too large, which increases the difficulty for workers to reach in for maintenance. 6. Each bolt 600 equipped with a third sealing ring 900 is first passed through the maintenance hole body 100 and the first sealing ring 200, and then passed through the bolt through hole 702 of the cylinder body 700. Then, it is passed through the cylinder wall gasket 300 and tightened with the first set of nuts 1000. After the first set of nuts 1000 are installed on their respective bolts one by one; next, the second sealing ring 400 and the maintenance hole cover 500 are put on, and finally the second set of nuts 800 are screwed on. After tightening the second set of nuts 800 one by one, the maintenance hole body 100 is fixed to the cylinder wall. It can be seen that the current maintenance hole structure is complex, requires many parts, and is cumbersome to install. The production cost is high, and the multiple screws and rubber rings must be evenly stressed, and the sealing requirements are high. 7. Install filtration system; 8. Pressure test (due to structural reasons, the maximum working pressure is limited) test.

[0006] In the current process, if the bolt 600 is pre-fixed to the cylinder liner, the protruding bolt and the maintenance hole 100 will interfere with the fiber winding process, causing uneven fiber laying (once uneven laying, it will affect the compressive strength of the filter cylinder); if the maintenance hole 100 is shortened and covered and bonded, the sealing ring 200 cannot be compressed and sealed, and thus will not have a sealing effect.

[0007] From the above, it can be seen that the maintenance hole structure of the deep filter sand cylinder is relatively complex, the processing is difficult, the efficiency is low, and the production cost is high. Summary of the Invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a maintenance hole structure for a deep filter cylinder with a simpler and more reasonable structure, which is simpler to produce and more efficient, and also facilitates the installation and maintenance of the filter system.

[0009] Another object of the present invention is to provide a production and assembly method for a deep filter cylinder.

[0010] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: A maintenance hole structure for a deep filter cylinder comprises a cylinder body, a fixing piece, a maintenance hole body with bolts, a sealing ring and a maintenance hole cover, wherein: The cylinder body is made by laying fibers on the outer wall of the cylinder body liner upper part and the cylinder body liner lower part joined together; a neck is provided on the upper part of the cylinder body; and a maintenance hole is provided on the side wall of the lower part of the cylinder body; The fixing member is a tubular structure, which is first bonded and fixed to the inner wall of the lower part of the cylinder liner at the maintenance hole before the upper and lower parts of the cylinder liner are joined; There are multiple bolts, which are circumferentially distributed and preset on the outer end surface of the maintenance hole body; The maintenance hole body is a "convex" shaped hollow tube; the narrow opening of the maintenance hole body is inserted into the fixing piece from the maintenance hole and bonded to the fixing piece; The sealing ring is attached to the outer end surface of the maintenance hole body; A bolt hole corresponding to the bolt is provided on the maintenance hole cover; the maintenance hole cover is attached to the sealing ring after the bolt passes through the bolt hole and is tightened and fixed with a nut.

[0011] A production and assembly method for a deep filter cylinder comprises the following steps: 1) The upper and lower parts of the cylinder liner are injection molded; 2) Open a maintenance hole at the bottom of the cylinder liner; 3) Adhere the fixing piece to the inner wall of the lower part of the cylinder liner at the maintenance hole; 4) Join the upper and lower parts of the cylinder liner to form the cylinder liner; 5) Winding fibers on the outer wall of the cylinder liner and then applying glue to form the cylinder body; 6) Cut the fibers wrapped around the fixing parts; 7) Apply glue to the position where the maintenance hole body and the fixing piece are to be fitted, insert the narrow opening of the maintenance hole body into the fixing piece through the maintenance hole and bond them together; 8) Install the system; 9) Pressure test.

[0012] Compared with the prior art, the present invention has the following beneficial effects: since the maintenance hole structure includes a fixing piece, a maintenance hole body with bolts, a sealing ring and a maintenance hole cover, its structure is simpler and requires fewer parts; in addition, the maintenance hole body is bonded to the maintenance hole by means of a fixing piece pre-bonded to the inner wall of the cylinder body, and a plurality of bolts are preset on the side of the maintenance hole body facing outward, so that there is no need to drill a plurality of bolt through holes on the outer wall next to the maintenance hole, and there will be no edge collapse when drilling the bolt through hole due to the screw through hole being close to the maintenance hole, which can improve production efficiency and improve the yield rate; moreover, since the fixing piece is bonded to the inner liner of the cylinder body, The lower part is previously bonded to the maintenance hole at the lower part of the cylinder liner, and the fixing part will not be exposed from the cylinder liner. In this way, the fixing part will not interfere with the subsequent uniform laying of the fiber filaments (helping to ensure the strength of the filter cylinder). At the same time, the fixing part will not be restricted by the size of the neck opening on the upper part of the cylinder body, so the maintenance hole can be opened larger, and the hollow hole of the maintenance hole body is also larger. At the same time, the larger fixing part is also not restricted by the neck opening. The larger maintenance hole helps workers to subsequently install and repair the filter system in the cylinder body. Therefore, the structure of the present invention is simpler and more reasonable, its production is simpler and more efficient, and it also helps the installation and maintenance of the filter system.

[0013] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the current deep filter tank; Figure 2 This is a decomposition diagram of the maintenance hole structure of the current deep filter cylinder; Figure 3 This is a three-dimensional schematic diagram of the current deep filter cylinder; Figure 4 This is an exploded view of the maintenance hole structure of the current deep filter cylinder; Figure 5 It is a structural diagram of an embodiment of the present invention; Figure 6 is an exploded schematic diagram of a maintenance hole structure according to an embodiment of the present invention; Figure 7 1 is an exploded view of the maintenance hole structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention is a maintenance hole structure for a deep filter cylinder, such as Figures 5 to 7 As shown, it includes a cylinder body 1, a fixing part 2, a maintenance hole body 4 with bolts 3, a sealing ring 5 and a maintenance hole cover 6, wherein: The cylinder body 1 is made by winding (laying) fibers on the outer wall of the cylinder body liner upper part and the cylinder body liner lower part joined together; a neck is provided on the upper part of the cylinder body 1; and a maintenance hole 11 is provided on the side wall of the lower part of the cylinder body. The fixing member 2 is a tubular structure, which is first bonded and fixed to the inner wall of the lower part of the cylinder liner at the maintenance hole 11 before the upper and lower parts of the cylinder liner are joined; There are multiple bolts 3, which are circumferentially distributed and preset on the outer end surface of the maintenance hole body 4; The maintenance hole body 4 is a "convex" shaped hollow tube; the narrow end of the maintenance hole body 4 is inserted into the fixing member 2 from the maintenance hole 11 and bonded to the fixing member 2; The sealing ring 5 is attached to the outer end surface of the maintenance hole body 4; The maintenance hole cover 6 is provided with a bolt hole 61 corresponding to the bolt 3; the maintenance hole cover 6 is attached to the sealing ring 5 after the bolt 3 passes through the bolt hole 61 and is tightened with a nut 7, thereby completing the installation of the maintenance hole structure.

[0016] As can be seen from the above, the maintenance hole structure includes a fixing part 2, a maintenance hole body 4 with bolts 3, a sealing ring 5 and a maintenance hole cover 6. Its structure is simpler and requires fewer parts. In addition, the maintenance hole body 4 is bonded to the maintenance hole by means of a fixing part 2 pre-bonded to the inner wall of the cylinder body, and a plurality of bolts 3 are preset on the side of the maintenance hole body 4 facing outward. In this way, there is no need to drill a plurality of bolt through holes on the outer wall next to the maintenance hole, and there will be no situation where the edge of the screw through hole is close to the maintenance hole and is easily broken when drilling the bolt through hole. This can improve production efficiency and improve the yield rate. In addition, since the fixing part 2 is bonded in advance The upper and lower parts of the cylinder body inner shell are pre-bonded to the maintenance hole at the lower part of the cylinder body, and the fixing parts will not be exposed from the cylinder body inner shell. In this way, the fixing parts will not interfere with the uniform laying of the subsequent fiber filaments (this helps to ensure the compressive strength of the filter cylinder). At the same time, the fixing parts will not be restricted by the size of the neck opening at the upper part of the cylinder body, so the maintenance hole can be opened larger, and the hollow hole of the maintenance hole body is also larger. At the same time, the fixing parts 2 that are made larger are also not restricted by the neck opening. The larger maintenance hole helps workers to subsequently install and repair the filtering system in the cylinder body. Therefore, the structure of the present invention is simpler and more reasonable, its production is simpler and more efficient, and it also helps the installation and maintenance of the filtering system.

[0017] The production and assembly method of the deep filter cylinder of the present invention comprises the following steps: 1) The upper and lower parts of the cylinder liner are injection molded; 2) Open a maintenance hole 11 at the lower part of the cylinder liner; 3) Adhere the fixing member 2 to the inner wall of the lower part of the cylinder liner at the maintenance hole 11; 4) Join the upper and lower parts of the cylinder liner to form the cylinder liner; 5) Winding fibers on the outer wall of the cylinder liner and then applying glue to make the cylinder body to enhance the strength of the cylinder body; 6) Cut the fibers wrapped around the fixing member 2; 7) Apply glue to the position where the maintenance hole body 4 and the fixing piece 2 are to be fitted, and then insert the narrow opening of the maintenance hole body 4 into the fixing piece 2 through the maintenance hole 11 and bond them together with the fixing piece 2; 8) Installation system: Its structure and installation are consistent with the current swimming pool filter system, so I will not elaborate on it here; 9) Pressure test: after pressure test, the pressure requirements of the filter cylinder are met.

[0018] In the above steps, the fixings pre-bonded to the lower part of the cylinder liner will not interfere with the subsequent uniform laying of the fiber filaments. In this way, the fixings can be bonded to the lower part of the cylinder liner first, and then the upper and lower parts of the cylinder liner can be bonded together. In addition, the bolts are preset on the maintenance hole body instead of passing through the cylinder body, so there is no need to drill bolt holes in the cylinder body. From the above, it can be seen that the production and assembly method of the deep filter cylinder of the present invention is completely different from the production and assembly method of the deep filter cylinder at this stage.

[0019] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art from this disclosure that various changes or modifications may be made to the present invention without departing from the principles and spirit of the invention as defined in the claims. Therefore, the detailed description of the disclosed embodiments is intended to be illustrative only and not to limit the present invention, which is to be defined by the claims.

Claims

1. A maintenance hole structure for a deep filter cylinder, characterized in that: It includes cylinder body, fixing parts, maintenance hole body with bolts, sealing ring and maintenance hole cover, of which: The cylinder body is made by laying fibers on the outer wall of the cylinder body liner upper part and the cylinder body liner lower part joined together; a neck is provided on the upper part of the cylinder body; and a maintenance hole is provided on the side wall of the lower part of the cylinder body; The fixing member is a tubular structure, which is first bonded and fixed to the inner wall of the lower part of the cylinder liner at the maintenance hole before the upper and lower parts of the cylinder liner are joined; There are multiple bolts, which are circumferentially distributed and preset on the outer end surface of the maintenance hole body; The maintenance hole body is a "convex" shaped hollow tube; the narrow opening of the maintenance hole body is inserted into the fixing piece from the maintenance hole and bonded to the fixing piece; The sealing ring is attached to the outer end surface of the maintenance hole body; A bolt hole corresponding to the bolt is provided on the maintenance hole cover; the maintenance hole cover is attached to the sealing ring after the bolt passes through the bolt hole and is tightened and fixed with a nut.

2. A method for producing and assembling a deep filter cylinder according to claim 1, characterized in that: The steps include: 1) The upper and lower parts of the cylinder liner are injection molded; 2) Open a maintenance hole at the bottom of the cylinder liner; 3) Adhere the fixing piece to the inner wall of the lower part of the cylinder liner at the maintenance hole; 4) Join the upper and lower parts of the cylinder liner to form the cylinder liner; 5) Winding fibers on the outer wall of the cylinder liner and then applying glue to form the cylinder body; 6) Cut the fibers wrapped around the fixing parts; 7) Apply glue to the position where the maintenance hole body and the fixing piece are to be fitted, insert the narrow opening of the maintenance hole body into the fixing piece through the maintenance hole and bond them together; 8) Install the system; 9) Pressure test.

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