Filter cartridge, filter and filtration system

Abstract

The present application relates to a kind of filter elements, including support cylinder, first filter screen, second filter screen and two end caps, multiple openings are provided on support cylinder, first filter screen is formed multiple first inner creases and first outer creases after multiple reciprocating bending, first filter screen is set outside support cylinder, second filter screen is formed multiple second inner creases and second outer creases after multiple reciprocating bending, second filter screen is set outside first filter screen, one second outer crease is set in each first outer crease, the two ends of support cylinder, first filter screen and second filter screen from inside to outside in turn are sealed after being extruded, and one end cap is installed respectively, the storage space of lint and other impurities is improved by first outer crease, the part of first inner crease close to support cylinder is not blocked by lint and other impurities, so that filter element can continue filtering, the service life of filter element is extended, thereby reducing the replacement frequency of filter element.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial water purification, and in particular to a filter core, a filter and a filter system. BACKGROUND

[0002] The main method for manufacturing single crystal silicon in the prior art is the Czochralski method, which is performed in a Czochralski furnace, and a single crystal silicon having a required crystal orientation is used as a seed crystal to grow a silicon single crystal from a molten semiconductor-grade silicon on the seed crystal. The grown silicon single crystal is a replica of the seed crystal and has the same crystal orientation as the seed crystal. A silicon single crystal rod is a final product formed by the Czochralski method.

[0003] The Czochralski furnace needs to be cooled during use, and a cooling water circulation system is generally used to achieve this. The existing cooling water circulation system uses a single water inlet to reach the cooling area of the single crystal furnace, and after cooling is completed, the water outlet of the cooling area of the single crystal furnace is circulated to the water inlet of the cooling water circulation system.

[0004] To prevent the pipes in the cooling water circulation system from being blocked due to factors such as scale deposition and lint accumulation, a filter is provided in the cooling water circulation system. Since the filter bears the filtration load of multiple single crystal furnaces, a cooling water circulation pump is provided in front of the water inlet of the filter to improve the filtration efficiency. The cooling water circulation pump injects cooling water into the filter at a pressure of 3KG to improve the filtration performance of the filter. However, during the filtration process using the existing filter, the ultrafiltration holes of the filter often become blocked in a short period of time, and the filter core needs to be frequently replaced to maintain the filtration performance of the filter. The reason for the frequent replacement of the filter core is that the filter core has limited capacity to store impurities such as lint and scale. When the ultrafiltration holes of the filter core become excessively blocked, the filtration performance of the filter core deteriorates significantly, which cannot meet the filtration requirements of the cooling water circulation system. SUMMARY

[0005] The main purpose of the present application is to provide a filter core to solve the problem of frequent replacement of the filter core in the process of purifying cooling water in the prior art.

[0006] The present application also provides a filter.

[0007] The present application also provides a filter system.

[0008] The filter element comprises a supporting cylinder, a first filter screen, a second filter screen and two end covers, the first filter screen and the second filter screen are sequentially sleeved on the supporting cylinder; specifically, a plurality of openings are arranged on the supporting cylinder, the first filter screen is formed with a plurality of first inner folds and a plurality of first outer folds after being repeatedly bent, the first filter screen with the plurality of first inner folds and the first outer folds is arranged outside the supporting cylinder, the second filter screen is formed with a plurality of second inner folds and a plurality of second outer folds after being repeatedly bent, the second filter screen with the plurality of second inner folds and the second outer folds is arranged outside the first filter screen, the extending directions of the first inner folds, the first outer folds, the second inner folds and the second outer folds are the same as the length extending direction of the supporting cylinder, one second inner fold is correspondingly arranged outside each first inner fold, one second outer fold is correspondingly arranged outside each first outer fold, a first preset interval is arranged between the first inner fold and the second inner fold, a second preset interval is arranged between the first outer fold and the second outer fold, the two ends of the supporting cylinder, the first filter screen and the second filter screen sequentially arranged from inside to outside are formed with a sealing part through extrusion, the end cover is a ring body, a ring groove is arranged on one end surface of the end cover, the sealing part is inserted into the ring groove, and the end cover is arranged on the sealing part through stamping, the connection between the end cover and the supporting cylinder and the connection between the end cover and the second filter screen are both sealed connections, the first filter screen is a filter screen with a mesh number of 2800 to 3200, the second filter screen is a filter screen with a mesh number of 3800 to 4200, the lint, scale and other impurities in the cooling water gradually gather in the tips of the first outer folds due to the water flow impact after entering the first filter screen, the storage space of the lint and other impurities is increased through the plurality of first outer folds, the part of the first inner fold close to the supporting cylinder is not blocked by the lint and other impurities, so that the filter element can continuously filter, the service life of the filter element is prolonged, and the replacement frequency of the filter element is reduced.

[0009] Preferably, a plurality of first limiting clamping grooves are arranged on the outer side wall of the supporting cylinder, the plurality of first limiting clamping grooves are annularly arranged on the outer side wall of the supporting cylinder, the number of the first limiting clamping grooves is consistent with the number of the first inner folds, the distance between the two adjacent first limiting clamping grooves is equal, and each first inner fold is correspondingly arranged in a corresponding first limiting clamping groove, the corresponding first inner fold is fixed through the first limiting clamping groove to avoid displacement after the water flow impacts the first inner fold, the displaced first inner fold is close to or adheres to the second inner fold, so that the ultrafiltration holes on the first inner fold and the ultrafiltration holes on the second inner fold are staggered and superimposed to reduce the filtering performance.

[0010] Preferably, the outer side of the second filter screen is provided with a snap ring, the inner side wall of the snap ring is provided with a plurality of second limiting clamping grooves, the plurality of second limiting clamping grooves are annularly arranged on the inner side wall of the snap ring, the number of the second limiting clamping grooves is consistent with the number of the second outer wrinkles, the distance between the adjacent two second limiting clamping grooves is equal, and each second outer wrinkle is arranged in the corresponding second limiting clamping groove, so that the corresponding second outer wrinkle is fixed by the second limiting clamping groove to avoid displacement of the second outer wrinkle caused by water flow impact, and the second outer wrinkle after displacement is close to or adheres to the first outer wrinkle, so that the ultrafiltration holes on the first outer wrinkle and the ultrafiltration holes on the second outer wrinkle are staggered and superimposed to reduce the filtering performance.

[0011] Preferably, the first filter screen and the second filter screen are both carbon steel screens.

[0012] A filter includes a shell, a cover, a plurality of plugging assemblies, and the filter element described above, the shell is provided with a water inlet pipe and a water outlet pipe, a partition plate is arranged in the shell, the water inlet pipe is arranged below the partition plate, the water outlet pipe is arranged above the partition plate, a plurality of first fixing holes are arranged on the partition plate, a fixed column extending upward is arranged at the center of the partition plate, an outer thread is arranged at the top end of the fixed column, a plurality of first fixing holes are annularly arranged around the fixed column, one filter element is installed in each first fixing hole, and the lower end of the filter element is sealingly fixed in the first fixing hole. The plugging assembly includes a cover plate and a plurality of plugging pieces, a plurality of second fixing holes are arranged on the cover plate, the number of the second fixing holes is equal to the number of the first fixing holes, the number of the plugging pieces is equal to the number of the second fixing holes, each second fixing hole is located above a first fixing hole, a third fixing hole is arranged in the middle of the cover plate, the plugging piece includes an upper plug, a lower plug, and a spring connecting the upper plug and the lower plug, the lower plug is installed in the end cover on the upper end of the filter element, the lower plug and the inner cavity of the end cover are matched, the upper plug is installed in the second fixing hole, the fixed column passes through the third fixing hole and is installed with a nut, the cover plate is pressed down by tightening the nut, and each spring is compressed after the cover plate is pressed down, so that each lower plug completely seals the corresponding end cover; the cover is sealingly buckled on the top of the shell.

[0013] Preferably, the cover and the shell are sealingly connected together by a hoop, a first pipe body is arranged at the top of the cover, a pressure gauge is arranged at the top end of the first pipe body, a drain pipe is arranged on the shell, the drain pipe is arranged close to the bottom of the shell, the drain pipe and the first pipe body are communicated with each other through a connecting pipe, a valve is arranged on the drain pipe and the connecting pipe, the partition plate divides the shell into an upper cavity and a lower cavity, the upper cavity is located above the partition plate, and the lower cavity is located below the partition plate, the cooling water in the lower cavity can be discharged by opening the valve of the drain pipe, and the cooling water and air in the upper cavity can be discharged by opening the valve of the connecting pipe.

[0014] Preferably, the first fixing hole is a counterbore, and a sealing washer is arranged between the end cover at the lower end of the filter and the first fixing hole.

[0015] A filtering system comprises a cooling water storage tank, a cooling water circulating pump, the filter as claimed in the preceding claim, a purified cooling water storage tank, the water inlet of the cooling water circulating pump and the cooling water storage tank being connected by a pipeline, the water outlet of the cooling water circulating pump and the water inlet pipe of the filter being connected by a pipeline, and the water outlet pipe of the filter and the purified cooling water storage tank being connected by a pipeline.

[0016] Preferably, the filtering system further comprises two cooling water circulating pumps and two filters as claimed in the preceding claim, each cooling water circulating pump and a corresponding filter being connected in series by a pipeline to form a filtering assembly, and two filtering assemblies being connected in parallel by pipelines; when the valves of one filtering assembly are all opened and the valves of the other filtering assembly are all closed, a working mode of one open and one standby is formed, so that the filter in the closed filtering assembly can be replaced with a filter core, and the normal operation of the filtering system is not affected during the replacement of the filter core, thereby ensuring the normal production.

[0017] Preferably, the purified cooling water storage tank is connected to the cooling end of each single crystal furnace by a pipeline, and the cooling end of each single crystal furnace is connected to the cooling water storage tank by a pipeline.

[0018] According to the above technical solution, the filtering area is increased by the multiple reciprocating folding of the first filter screen and the second filter screen. In addition, the lint and scale impurities in the cooling water gradually accumulate in the tip of the first outer fold after entering the first filter screen. The first inner fold near the supporting cylinder has not been blocked by the lint and scale impurities, so that the filter core can continuously filter and the service life of the filter core is prolonged, thereby reducing the replacement frequency of the filter core. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of the filter core.

[0020] Figure 2 is a front view of the filter core.

[0021] Figure 3 is a sectional view of A-A in Figure 2 .

[0022] Figure 4 is an enlarged view of B in Figure 3 .

[0023] Figure 5 is an enlarged view of another embodiment.

[0024] Figure 6 is a perspective view of an end cover.

[0025] Figure 7 is a perspective view of a filter.

[0026] Figure 8 is a front view of the filter.

[0027] Figure 9 is Figure 8 is a sectional view at C-C in

[0028] Figure 10 is a perspective sectional view of the shell.

[0029] Figure 11 is a perspective exploded view of the cover plate, the plugging member and the filter.

[0030] Figure 12 is a structural block diagram of the filtration system.

[0031] In the figure: filter 100, filter element 10, support cylinder 11, opening 111, first limiting clamping groove 112, first filter screen 12, first inner fold 121, first outer fold 122, second filter screen 13, second inner fold 131, second outer fold 132, end cover 14, annular groove 141, sealing portion 15, clamping ring 16, second limiting clamping groove 161, shell 20, water inlet pipe 21, water outlet pipe 22, partition plate 23, drain pipe 24, first fixing hole 231, fixing column 232, fastening nut 233, upper cavity 201, lower cavity 202, cover 30, first pipe 31, pressure gauge 32, plugging assembly 40, cover plate 41, second fixing hole 411, third fixing hole 412, plugging member 42, upper plug 421, lower plug 422, spring 423, clamp 50, connecting pipe 60, cooling water storage tank 200, cooling water circulating pump 300, purified cooling water storage tank 400, cooling end 500 of the single crystal furnace. DETAILED DESCRIPTION

[0032] The technical solutions and technical effects of the embodiments of the application are further described in detail below in combination with the drawings of the application.

[0033] Please refer to Figures 1 to 11The filter element 10 comprises a supporting cylinder 11, a first filter screen 12, a second filter screen 13 and two end covers 14, and the first filter screen 12 and the second filter screen 13 are sequentially sleeved on the supporting cylinder 11. Specifically, a plurality of openings 111 are arranged on the supporting cylinder 11, the first filter screen 12 is formed with a plurality of first inner folds 121 and a plurality of first outer folds 122 after being repeatedly bent, the first filter screen 12 with the first inner folds 121 and the first outer folds 122 is arranged outside the supporting cylinder 11, the second filter screen 13 is formed with a plurality of second inner folds 131 and a plurality of second outer folds 132 after being repeatedly bent, the second filter screen 13 with the second inner folds 131 and the second outer folds 132 is arranged outside the first filter screen 12, the extending directions of the first inner folds 121, the first outer folds 122, the second inner folds 131 and the second outer folds 132 are the same as the length extending direction of the supporting cylinder 11, one second inner fold 131 is correspondingly arranged outside each first inner fold 121, one second outer fold 132 is correspondingly arranged outside each first outer fold 122, a first preset interval is arranged between the first inner fold 121 and the second inner fold 131, a second preset interval is arranged between the first outer fold 122 and the second outer fold 132, the two ends of the supporting cylinder 11, the first filter screen 12 and the second filter screen 13 which are sequentially arranged from inside to outside are tightly extruded to form a sealing part 15, the end cover 14 is a ring body, a ring groove 141 is arranged on one end surface of the end cover 14, the sealing part 15 is inserted into the ring groove 141, and the end cover 14 is arranged on the sealing part 15 by stamping, the connection between the end cover 14 and the supporting cylinder 11 and the connection between the end cover 14 and the second filter screen 13 are both sealed connections, the first filter screen 12 is a filter screen with a mesh number of 2800 to 3200, and the second filter screen 13 is a filter screen with a mesh number of 3800 to 4200. Specifically, the first filter screen 12 is a filter screen with a mesh number of 3000, and the second filter screen 13 is a filter screen with a mesh number of 4000. The cooling water to be purified enters from the through hole of the end cover 14 at the lower end of the filter element 10, the through hole of the end cover 14 at the upper end of the filter element 10 needs to be sealed during the filtering process, so that the cooling water can only enter the supporting cylinder 11 through the through hole of the end cover 14 at the lower end of the filter element 10 first, then enter the first filter screen 12 along the openings 111 of the supporting cylinder 11, then enter the second filter screen 13 after being filtered by the first filter screen 12, and then enter the outside of the second filter screen 13 after being filtered by the second filter screen 13. Since the lint, scale and other impurities in the cooling water gradually gather in the tips of the first outer folds 122 after entering the first filter screen 12 due to the water flow impact, the storage space of the lint and other impurities is increased by the plurality of first outer folds 122, and the part of the first inner folds 121 close to the supporting cylinder 11 is not blocked by the lint and other impurities, so that the filter element 10 can continuously filter the cooling water, the service life of a single filter element 10 is prolonged, and the replacement frequency of the filter element 10 is reduced.Wherein the folds are the parts connected between adjacent filter arms formed by reciprocating bending of the filter screen, each first inner fold 121 is opposite to a row of holes 111 on the support cylinder 11, so that when high-pressure water reaches the first inner fold 121 from the hole 111, the first inner fold 121 disperses the high-pressure water, and the dispersed high-pressure water reaches the second filter screen 13 from the filter arm of the first filter screen 12, thereby improving the filtering efficiency and effect.

[0034] Further, please combine Figure 5 A plurality of first limiting clamping grooves 112 are arranged on the outer side wall of the support cylinder 11, the plurality of first limiting clamping grooves 112 are annularly arranged on the outer side wall of the support cylinder 11, the number of the first limiting clamping grooves 112 is consistent with the number of the first inner folds 121, the distance between adjacent two first limiting clamping grooves 112 is equal, and each first inner fold 121 is arranged in a corresponding first limiting clamping groove 112. The corresponding first inner fold 121 is fixed by the first limiting clamping groove 112 to avoid displacement of the first inner fold 121 after being impacted by the water flow of 3KG water pressure. The first inner fold 121 after displacement will be close to or adhere to the second inner fold 131, so that the ultrafiltration holes on the first inner fold 121 and the ultrafiltration holes on the second inner fold 131 are misaligned and superimposed to reduce the filtering performance. The first limiting clamping groove 112 can be formed on the support cylinder 11 by stamping, or can be separately made into a clamping groove and fixed on the support cylinder 11 by welding or bonding.

[0035] Further, please combine Figure 5 A plurality of second limiting clamping grooves 161 are arranged on the inner side wall of the clamping ring 16, the plurality of second limiting clamping grooves 161 are annularly arranged on the inner side wall of the clamping ring 16, the number of the second limiting clamping grooves 161 is consistent with the number of the second outer folds 132, the distance between adjacent two second limiting clamping grooves 161 is equal, and each second outer fold 132 is arranged in a corresponding second limiting clamping groove 161. The corresponding second outer fold 132 is fixed by the second limiting clamping groove 161 to avoid displacement of the second outer fold 132 after being impacted by the water flow. The second outer fold 132 after displacement will be close to or adhere to the first outer fold 122, so that the ultrafiltration holes on the first outer fold 122 and the ultrafiltration holes on the second outer fold 132 are misaligned and superimposed to reduce the filtering performance.

[0036] Further, the filter 100 further comprises a shell 20, a cover 30 and a plurality of blocking assemblies 40, the shell 20 is provided with an inlet pipe 21 and an outlet pipe 22, a partition plate 23 is arranged in the shell 20, the inlet pipe 21 is arranged below the partition plate 23, the outlet pipe 22 is arranged above the partition plate 23, a plurality of first fixing holes 231 are arranged on the partition plate 23, a fixing column 232 extending upward is arranged at the center of the partition plate 23, an outer thread is arranged at the top end of the fixing column 232, a plurality of first fixing holes 231 are arranged around the fixing column 232, one filter element 10 is installed in each first fixing hole 231, the lower end of the filter element 10 is sealingly fixed in the first fixing hole 231, the blocking assembly 40 comprises a cover plate 41 and a plurality of blocking pieces 42, a plurality of second fixing holes 411 are arranged on the cover plate 41, the number of second fixing holes 411 is equal to the number of first fixing holes 231, the number of blocking pieces 42 is equal to the number of second fixing holes 411, each second fixing hole 411 is located above one first fixing hole 231, a third fixing hole 412 is arranged in the middle of the cover plate 41, the blocking piece 42 comprises an upper plug 421, a lower plug 422 and a spring 423 connecting the upper plug 421 and the lower plug 422, the lower plug 422 is installed in the end cover 14 at the upper end of the filter element 10, the lower plug 422 is matched with the inner cavity of the end cover 14, the upper plug 421 is installed in the second fixing hole 411, the fixing column 232 passes through the third fixing hole 412 and is installed with a nut, the cover plate 41 is pressed down by tightening the nut 233, after the cover plate 41 is pressed down, each spring 423 is compressed to make each lower plug 422 completely seal the corresponding end cover 14; the cover 30 is sealingly buckled on the top of the shell 20. The cooling water enters the shell 20 from the inlet pipe 21, the cooling water entering the shell 20 enters the inside of the filter element 10 along the first fixing holes 231 of the partition plate 23 and the through holes of the end cover 14 at the lower end of the filter element 10, since the end cover 14 at the upper end of the filter element 10 is sealed and blocked by the lower plug 422, the cooling water can only penetrate and filter through the support cylinder 11, the first filter screen 12 and the second filter screen 13 in turn and then enter the inside of the shell 20 above the partition plate 23, at the same time, since the cover 30 is sealingly buckled on the top of the shell 20, the purified cooling water entering the inside of the shell 20 above the partition plate 23 can only flow out of the shell 20 along the outlet pipe 22.

[0037] Furthermore, the cover 30 and the shell 20 are sealed together by a clamp 50. A first pipe 31 is installed on the top of the cover 30, and a pressure gauge 32 is installed at the top of the first pipe 31. A drain pipe 24 is installed on the shell 20, located near the bottom of the shell 20. The drain pipe 24 and the first pipe 31 are interconnected by a connecting pipe 60. A valve is installed on both the drain pipe 24 and the connecting pipe 60. A partition 23 divides the shell 20 into an upper cavity 201 and a lower cavity 202. The upper cavity 201 is located above the partition 23, and the lower cavity 202 is located below the partition 23. By opening the valve of the drain pipe 24, the cooling water in the lower cavity 202 can be discharged. By opening the valve on the connecting pipe 60, the cooling water and air in the upper cavity 201 can be discharged. The water pressure inside the shell can be observed through the pressure gauge, and the clogging status of the first and second filters can be further determined by the water pressure.

[0038] Furthermore, the first fixing hole 231 is a countersunk hole, and a sealing gasket is provided between the end cap 14 at the lower end of the filter 100 and the first fixing hole 231. The sealing gasket increases the sealing between the end cap 14 at the lower end of the filter 100 and the partition plate 23, so that cooling water can only enter the support cylinder 11 sequentially through the first fixing hole 231 and the through hole of the end cap 14 at the lower end of the filter 100, avoiding the cooling water from directly entering the upper cavity 201 from the gap between the first fixing hole 231 and the end cap 14 at the lower end of the filter 100.

[0039] Furthermore, both the first filter screen 12 and the second filter screen 13 are made of carbon steel.

[0040] Please see Figure 12 A filtration system includes a cooling water storage tank 200, a cooling water circulation pump 300, a filter 100, and a purified cooling water storage tank 400. The inlet of the cooling water circulation pump 300 is connected to the cooling water storage tank 200 via a pipe, the outlet of the cooling water circulation pump 300 is connected to the inlet pipe 21 of the filter 100 via a pipe, and the outlet pipe 22 of the filter 100 is connected to the purified cooling water storage tank 400 via a pipe. The cooling water storage tank 200 is used to store cooling water. The cooling water circulation pump 300 delivers the cooling water from the cooling water storage tank 200 to the filter 100, and the cooling water circulation pump 300 can provide a water pressure of 3 kg to the filter 100 to improve the filtration efficiency of the filter 100. The purified cooling water filtered by the filter 100 is stored in the purified cooling water storage tank 400 for subsequent cooling of equipment.

[0041] Further, the filter system further comprises two cooling water circulating pumps 300 and two filters 100 as described above, each cooling water circulating pump and a corresponding filter 100 are connected in series by pipes to form a filter assembly, and two filter assemblies are connected in parallel by pipes; when the valves of one filter assembly are all opened and the valves of the other filter assembly are all closed, a working mode of one open and one standby is formed, so that the filter core 10 in the closed filter assembly can be replaced, and the normal operation of the filter system will not be affected during the replacement of the filter core 10, and the normal production is ensured.

[0042] Further, the purified cooling water storage tank 400 is connected to the cooling end 500 of each single crystal furnace through management, and the cooling end 500 of each single crystal furnace is connected to the cooling water storage tank 200 through pipes. The cooling end 500 of the single crystal furnace described above is the water-cooled furnace shell of the single crystal furnace, or is the water-cooled heat shield and the like.

Claims

1. A filter element, characterized in that: The system includes a support cylinder, a first filter screen, a second filter screen, and two end caps. The first and second filter screens are sequentially fitted onto the support cylinder. The support cylinder has multiple openings. The first filter screen, after reciprocating bending, forms multiple first inner folds and multiple first outer folds. The first filter screen with multiple first inner folds and first outer folds is arranged around the outside of the support cylinder. The second filter screen, after reciprocating bending, forms multiple second inner folds and multiple second outer folds. The second filter screen with multiple second inner folds and second outer folds is arranged around the outside of the first filter screen. The extension directions of the first inner folds, first outer folds, second inner folds, and second outer folds are all the same as the length extension direction of the support cylinder. Each first inner fold is directly opposite a row of openings on the support cylinder. A second inner fold is correspondingly arranged outside each first inner fold, and a second outer fold is correspondingly arranged outside each first outer fold. A first preset distance is provided between the first inner folds and the second inner folds. The spacing is such that a second preset spacing is set between the first outer fold and the second outer fold. The support cylinder, the first filter screen, and the second filter screen are sequentially arranged from the inside to the outside. The two ends of the filter screen are squeezed tightly to form a sealing part. The end cap is an annular body with an annular groove on one end face. The sealing part is inserted into the annular groove and the end cap is set on the sealing part by stamping. The connection between the end cap and the support cylinder and the connection between the end cap and the second filter screen are sealed connections. The first filter screen is a 2800-3200 mesh filter screen and the second filter screen is a 3800-4200 mesh filter screen. After the impurities in the cooling water enter the first filter screen, the impurities are gradually accumulated in the tip of the first outer fold due to the impact of the water flow. While the storage space of impurities is increased by multiple first outer folds, the ultrafiltration pores of the first inner fold near the support cylinder are not blocked by impurities, so that the filter element can continuously filter, extend the service life of the filter element, and thus reduce the number of filter element replacements.

2. The filter element as described in claim 1, characterized in that: Multiple first limiting slots are provided on the outer wall of the support cylinder. The multiple first limiting slots are arranged in a ring on the outer wall of the support cylinder. The number of first limiting slots is consistent with the number of first inner folds. The distance between two adjacent first limiting slots is equal. Each first inner fold is respectively set in a corresponding first limiting slot. The first limiting slots fix the corresponding first inner folds to prevent them from shifting after water flow impacts them. If the first inner folds are shifted, they will approach or adhere to the second inner folds, causing the ultrafiltration pores on the first inner folds and the ultrafiltration pores on the second inner folds to overlap and misalign, thus reducing the filtration performance.

3. The filter element as described in claim 1, characterized in that: The outer side of the second filter screen is provided with a retaining ring, and the inner side wall of the retaining ring is provided with multiple second limiting grooves. The multiple second limiting grooves are arranged in a ring on the inner side wall of the retaining ring. The number of second limiting grooves is the same as the number of second outer folds. The distance between two adjacent second limiting grooves is equal. Each second outer fold is respectively set in the corresponding second limiting groove. The second limiting grooves fix the corresponding second outer folds to prevent water flow from impacting the second outer folds and causing them to shift. If the second outer folds are shifted, they will approach or stick to the first outer folds, causing the ultrafiltration pores on the first outer folds and the ultrafiltration pores on the second outer folds to overlap and misalign, reducing the filtration performance.

4. The filter element as described in claim 1, characterized in that: Both the first and second filter screens are made of carbon steel.

5. A filter, characterized in that: The system includes a housing, a cover, multiple sealing components, and a filter element as described in any one of claims 1 to 4. The housing has an inlet pipe and an outlet pipe. A partition is located inside the housing. The inlet pipe is positioned below the partition, and the outlet pipe is positioned above the partition. The partition has multiple first fixing holes. A fixing post extending upwards is located at the center of the partition. The top of the fixing post has an external thread. Multiple first fixing holes are arranged around the fixing post. A filter element is installed in each first fixing hole, and the lower end of the filter element is sealed and fixed in the first fixing hole. The sealing components include a cover plate and multiple sealing elements. The cover plate has multiple second fixing holes. The number of fixed holes is equal to the number of first fixed holes, and the number of sealing components is equal to the number of second fixed holes. Each second fixed hole is located above a first fixed hole. A third fixed hole is provided in the middle of the cover plate. The sealing components include an upper plug, a lower plug, and a spring connecting the upper plug and the lower plug. The lower plug is installed in the end cap at the upper end of the filter element, and the lower plug matches the inner cavity of the end cap. The upper plug is installed in the second fixed hole. After the fixing post passes through the third fixed hole, a nut is installed. The cover plate is pressed down by tightening the nut. After the cover plate is pressed down, each spring is compressed so that each lower plug completely seals the corresponding end cap. The cover body is sealed and fastened to the top of the housing.

6. The filter as described in claim 5, characterized in that: The cover and the shell are sealed together by a clamp. The top of the cover is equipped with a first pipe, and a pressure gauge is installed at the top of the first pipe. A drain pipe is installed on the shell, near the bottom of the shell. The drain pipe and the first pipe are connected to each other by a connecting pipe. A valve is installed on both the drain pipe and the connecting pipe. A partition divides the shell into an upper cavity and a lower cavity. The upper cavity is located above the partition, and the lower cavity is located below the partition. The cooling water in the lower cavity can be discharged by opening the valve on the drain pipe, and the cooling water and air in the upper cavity can be discharged by opening the valve on the connecting pipe.

7. The filter as described in claim 5, characterized in that: The first fixing hole is a countersunk hole, and a sealing gasket is installed between the end cap at the lower end of the filter and the first fixing hole.

8. A filtration system, characterized in that: It includes a cooling water storage tank, a cooling water circulation pump, and a filter and a purified cooling water storage tank as described in claim 5. The inlet of the cooling water circulation pump and the cooling water storage tank are connected by a pipeline, the outlet of the cooling water circulation pump and the inlet pipe of the filter are connected by a pipeline, and the outlet pipe of the filter and the purified cooling water storage tank are connected by a pipeline.

9. The filtration system as described in claim 8, characterized in that: The filtration system also includes two cooling water circulation pumps and two filters as described above. Each cooling water circulation pump and its corresponding filter are connected in series through pipelines to form a filtration assembly. The two filtration assemblies are then connected in parallel through pipelines. When all the valves of one filtration assembly are open, all the valves of the other filtration assembly are closed, forming an open-and-standby working mode. This allows for the replacement of filter elements in the closed filtration assembly without affecting the normal operation of the filtration system, ensuring normal production.

10. The filtration system as claimed in claim 9, characterized in that: The purified cooling water storage tanks are connected to the cooling end of each single crystal furnace through management, and the cooling end of each single crystal furnace is connected to the cooling water storage tank through pipelines.

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