A precision filter with secondary filtration

Abstract

The application relates to the technical field of filters, in particular to a precision filter with secondary filtration, which comprises a primary filter cylinder and a secondary filter cylinder; the interiors of the primary filter cylinder and the secondary filter cylinder are respectively provided with temperature-resistant filter elements; the bottom of the primary filter cylinder is communicatively provided with a shunt bottom pipe; the bottom of the secondary filter cylinder is communicatively provided with a drainage straight pipe; one end of the shunt bottom pipe is in communication with the temperature-resistant filter element in the primary filter cylinder, and the other end is in communication with the drainage straight pipe; a turbidity detection section is arranged in the shunt bottom pipe; the filter can automatically perform secondary filtration when the temperature-resistant filter element in the primary filter cylinder is damaged or leaks, so that the filtered liquid in the filter liquid pool is prevented from being polluted and reworked; after the temperature-resistant filter element in the primary filter cylinder is replaced, the filter can automatically switch back to the single filtration state of the primary filter cylinder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter, in particular to a precision filter with secondary filtration. BACKGROUND

[0002] The precision filter is a solid-liquid separation equipment for filtering various suspensions, the shell of which is generally made of stainless steel material, and the inside of which adopts various different filter elements, such as PP melt-blown, wire-burned, folded, titanium filter element, activated carbon filter element, etc., to realize high-precision filtration, and is widely applied in the industrial fields of medicine, food, chemical industry, environmental protection and water treatment; in the application of the precision filter in the prior art, when the filter element is damaged due to high pressure or corrosion, etc., the unfiltered liquid will flow into the filtered liquid pool that has completed filtration, resulting in the filtered liquid being contaminated, and thus the filtered liquid in the whole pool needs to be re-filtered, especially when a large amount of filtration is performed, once the above-mentioned situation occurs, the production work efficiency is seriously affected. SUMMARY

[0003] The present application aims to provide a precision filter with secondary filtration to solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a precision filter with secondary filtration, comprising a primary filter cylinder and a secondary filter cylinder, the inside of the primary filter cylinder and the secondary filter cylinder is respectively provided with a temperature-resistant filter element, the bottom of the primary filter cylinder is communicatively provided with a shunt bottom pipe, the bottom of the secondary filter cylinder is communicatively provided with a drainage straight pipe, one end of the shunt bottom pipe is in communication with the temperature-resistant filter element in the primary filter cylinder, the other end is in communication with the drainage straight pipe, a turbidity detection section is arranged in the shunt bottom pipe, the drainage straight pipe is provided with a first valve and a second valve, the first valve is located above the second valve, the communication port of the shunt bottom pipe and the drainage straight pipe is located between the first valve and the second valve, the surface of the drainage straight pipe is located below the second valve and is communicatively provided with a secondary filtrate pipe, the other end of the secondary filtrate pipe is in communication with the temperature-resistant filter element in the secondary filter cylinder.

[0005] An electric heating pipe is arranged in the inside of the secondary filter cylinder close to the lower position, a one-way structure with locking function is arranged on the secondary filtrate pipe, a pressure communication structure with adjusting function is arranged between the primary filter cylinder and the secondary filter cylinder.

[0006] The one-way structure comprises a control node chamber, a one-way plug, a positioning ring and a one-way spring, the control node chamber is arranged in communication in the secondary filtrate pipe, the inside of the control node chamber is provided with the one-way plug, the one-way plug can be matched with the control node chamber to block and seal the secondary filtrate pipe when moving upwards, the lower surface of the inside of the control node chamber is fixedly provided with the positioning ring, the inside of the positioning ring is provided with the one-way spring, and the upper end of the one-way spring abuts against the lower surface of the one-way plug.

[0007] The outside of the one-way spring is sleeved with a lifting lock ring, the inner ring diameter of the lifting lock ring is smaller than the diameter of the one-way plug, the lifting lock ring and the one-way spring are not in contact with each other, the surface of the lifting lock ring is provided with a through hole, and the upper surface of the lifting lock ring is fixedly provided with a lifting optical axis.

[0008] The upper surface of the control node chamber is provided with a sealing shaft sleeve, the lifting optical axis is sealed and inserted through the sealing shaft sleeve, the upper end of the lifting optical axis is fixedly provided with a driving ring, the outer surface of the driving ring is fixedly provided with a supporting ear plate, the lower side of the supporting ear plate is provided with a locking driving cylinder, the locking driving cylinder can drive the supporting ear plate to move up and down, the outside of the locking driving cylinder is fixedly provided with a right-angle frame plate, and the right-angle frame plate is fixedly installed with the secondary filter cartridge.

[0009] The pressure communication structure comprises a differential pressure pipe, a sealing ring table, a moving disc, a disc surface through hole and a sealing plug, one end of the differential pressure pipe is communicated with the primary filter cartridge, the other end is communicated with the secondary filter cartridge, the inner wall surface of the differential pressure pipe is fixedly provided with the sealing ring table, the side of the sealing ring table away from the primary filter cartridge is provided with the moving disc, the surface of the moving disc is provided with the disc surface through hole, the disc surface through hole is uniformly distributed in a circumferential array, the side surface of the moving disc facing the sealing ring table is fixedly provided with the sealing plug, the sealing plug is inserted into the inner ring of the sealing ring table, and the sealing plug is in sealing contact with the inner ring surface of the sealing ring table.

[0010] The differential pressure pipe is provided with an adjusting pressure ring, the adjusting pressure ring is located on the side away from the position of the primary filter cartridge of the moving disc, a pressing spring is arranged between the adjusting pressure ring and the moving disc, the pressing spring is in a compressed state and provides an elastic force outwardly, the inner wall surface of the differential pressure pipe is provided with a side wall transverse groove, the length direction of the side wall transverse groove is parallel to the axis of the differential pressure pipe, the outer side surface of the adjusting pressure ring is fixedly provided with a convex rib, and the convex rib is in limiting cooperation with the side wall transverse groove, so that the adjusting pressure ring can only move axially.

[0011] The side surface of the adjusting pressure ring facing the secondary filter cartridge is fixedly provided with an extrusion frame shaft, the side of the extrusion frame shaft away from the adjusting pressure ring is provided with an adjusting cone, the adjusting cone is in extrusion fit with the extrusion frame shaft, the upper surface of the adjusting cone is fixedly provided with a lifting bolt, the lifting bolt is coaxially arranged with the adjusting cone, the surface of the pressure distribution pipe is fixedly provided with a sealing screw sleeve, the lifting bolt is sealingly inserted through the sealing screw sleeve, and the two are in screw fit.

[0012] The surface of the primary filter cartridge is communicatively provided with an input pipe, the inside of the turbidity detection section is provided with a turbidity monitoring sensor, and the turbidity monitoring sensor can detect the turbidity of liquid flowing through the turbidity detection section.

[0013] The lower surface of the temperature-resistant filter element is communicatively provided with an output plug pipe, the inside lower surfaces of the primary filter cartridge and the secondary filter cartridge are respectively fixedly provided with sealing plug sleeves, and the output plug pipe is in sealing plug fit with the sealing plug sleeves.

[0014] Compared with the prior art, the filter has the beneficial effects that:

[0015] The filter can automatically perform secondary filtration when the temperature-resistant filter element in the primary filter cartridge is damaged or leaks, thereby avoiding pollution of the filtered liquid in the filter liquid pool and causing rework, and can automatically switch back to the single filtration state of the primary filter cartridge after replacing the temperature-resistant filter element in the primary filter cartridge.

[0016] The one-way block can be forcibly locked by the lifting lock ring, so that the secondary filter cartridge is completely closed, and the temperature-resistant filter element and other structures in the secondary filter cartridge are subjected to high-temperature steam sterilization, so that the inside of the secondary filter cartridge is in a humid environment and bacteria are easily bred, the high-temperature steam sterilization can effectively reduce the generation of bacteria, prolong the service life of the temperature-resistant filter element, and reduce the replacement frequency of the temperature-resistant filter element, and the one-way block can maintain the one-way liquid passage function and avoid backflow.

[0017] The pressure communication structure can reduce the damage probability of the temperature-resistant filter element in the primary filter cartridge, and can adjust the communication pressure according to the pressure resistance of the temperature-resistant filter element, so that the secondary filter cartridge is connected automatically when the set pressure is reached, the secondary filter cartridge shares the filtration flow, the upper limit of the pressure in the primary filter cartridge is reduced, the temperature-resistant filter element in the primary filter cartridge is less likely to be damaged, and the filter is suitable for various places with large pressure fluctuations. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic view of the overall structure of the filter.

[0019] Figure 2 Another angle view of the overall structure of the present application.

[0020] Figure 3 A side view of the overall structure of the present application.

[0021] Figure 4 A perspective half-section view of the overall structure of the present application.

[0022] Figure 5 A Figure 4 Enlarged view of area A in the middle.

[0023] Figure 6 A Figure 4 Enlarged view of area B in the middle.

[0024] Figure 7 A perspective half-section front view of the overall structure of the present application.

[0025] Figure 8 A Figure 7 Enlarged view of area C in the middle.

[0026] Figure 9 A Figure 7 Enlarged view of area D in the middle.

[0027] Figure 10 Another angle view of the overall structure of the present application.

[0028] In the figure: 1, primary filter cartridge; 2, secondary filter cartridge; 3, temperature-resistant filter core; 4, electric heating tube; 5, shunt bottom pipe; 6, drainage straight pipe; 7, turbidity detection section; 8, first valve; 9, second valve; 10, secondary filtrate pipe; 1001, control section bin; 1002, one-way blockage; 1003, positioning ring; 1004, one-way spring; 1005, lifting lock ring; 1006, through liquid hole; 1007, lifting optical axis; 1008, sealing shaft sleeve; 1009, driving ring; 1010, support ear plate; 1011, locking driving cylinder; 1012, right-angle frame plate; 201, pressure-dividing through pipe; 202, sealing ring table; 203, moving disc; 204, disc surface through hole; 205, sealing plug; 206, adjusting pressure ring; 207, pressure applying spring; 208, side wall transverse groove; 209, extrusion frame shaft; 210, adjusting cone; 211, lifting bolt; 212, sealing screw sleeve; 101, input pipe; 301, output plug pipe; 302, sealing plug sleeve; 701, turbidity monitoring sensor. DETAILED DESCRIPTION

[0029] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0030] Please refer to Figures 1 to 10 The present application provides a technical solution: a precision filter with secondary filtration, comprising a primary filter cartridge 1 and a secondary filter cartridge 2, the interiors of the primary filter cartridge 1 and the secondary filter cartridge 2 are respectively provided with temperature-resistant filter elements 3, the temperature-resistant filter elements 3 are made of high-temperature-resistant filter element materials, such as titanium filter elements, etc., the bottom of the primary filter cartridge 1 is communicatively provided with a shunt bottom pipe 5, the bottom of the secondary filter cartridge 2 is communicatively provided with a drainage straight pipe 6, one end of the shunt bottom pipe 5 is in communication with the temperature-resistant filter element 3 in the primary filter cartridge 1, the other end is in communication with the drainage straight pipe 6, the shunt bottom pipe 5 is provided with a turbidity detection section 7, the drainage straight pipe 6 is provided with a first valve 8 and a second valve 9, the first valve 8 and the second valve 9 are both electrically controlled water valves, which are controlled to open and close through a circuit, the first valve 8 is located above the second valve 9, the communication port of the shunt bottom pipe 5 and the drainage straight pipe 6 is located between the first valve 8 and the second valve 9, the surface of the drainage straight pipe 6 is located below the second valve 9 and is communicatively provided with a secondary filtrate pipe 10, the other end of the secondary filtrate pipe 10 is in communication with the temperature-resistant filter element 3 in the secondary filter cartridge 2.

[0031] The interior of the secondary filter cartridge 2 is provided with an electric heating pipe 4 near the lower position, the secondary filtrate pipe 10 is provided with a one-way structure with locking function, the primary filter cartridge 1 and the secondary filter cartridge 2 are provided with a pressure communication structure with adjusting function.

[0032] The one-way structure comprises a control section bin 1001, a one-way plug 1002, a positioning ring 1003 and a one-way spring 1004, the control section bin 1001 is communicatively provided in the secondary filtrate pipe 10, the interior of the control section bin 1001 is provided with the one-way plug 1002, the one-way plug 1002 can be matched with the control section bin 1001 to block and seal the secondary filtrate pipe 10 when it moves upward, the lower surface position of the interior of the control section bin 1001 is fixedly provided with the positioning ring 1003, the interior of the positioning ring 1003 is provided with the one-way spring 1004, the upper end of the one-way spring 1004 is located on the lower surface of the one-way plug 1002.

[0033] The exterior of the one-way spring 1004 is sleeved with a lifting lock ring 1005, the inner ring diameter of the lifting lock ring 1005 is smaller than the diameter of the one-way plug 1002, the lifting lock ring 1005 and the one-way spring 1004 are not in contact with each other, the surface of the lifting lock ring 1005 is provided with a through liquid hole 1006, the upper surface of the lifting lock ring 1005 is fixedly provided with a lifting optical axis 1007.

[0034] The upper surface of the control section 1001 is provided with a sealing bush 1008, the lifting optical axis 1007 is sealed through the sealing bush 1008, the upper end of the lifting optical axis 1007 is fixedly provided with a driving ring 1009, the outer surface of the driving ring 1009 is fixedly provided with a supporting lug plate 1010, the lower side of the supporting lug plate 1010 is provided with a locking driving cylinder 1011, the locking driving cylinder 1011 can drive the supporting lug plate 1010 to move up and down, the outer side of the locking driving cylinder 1011 is fixedly provided with a right-angle bracket plate 1012, and the right-angle bracket plate 1012 is fixedly installed with the secondary filter cylinder 2.

[0035] The pressure communication structure comprises a pressure distribution pipe 201, a sealing ring table 202, a moving disc 203, a disc surface through hole 204 and a sealing plug 205, one end of the pressure distribution pipe 201 is communicated with the primary filter cylinder 1, the other end is communicated with the secondary filter cylinder 2, the inner wall surface of the pressure distribution pipe 201 is fixedly provided with the sealing ring table 202, the side of the sealing ring table 202 away from the primary filter cylinder 1 is provided with the moving disc 203, the surface of the moving disc 203 is provided with the disc surface through hole 204, the disc surface through hole 204 is uniformly distributed in a circumferential array, the side surface of the moving disc 203 facing the sealing ring table 202 is fixedly provided with the sealing plug 205, the sealing plug 205 is inserted into the inner ring of the sealing ring table 202, and the sealing plug 205 is in sealing contact with the inner ring surface of the sealing ring table 202.

[0036] The pressure distribution pipe 201 is provided with an adjusting pressure ring 206, the adjusting pressure ring 206 is located on the side away from the position of the primary filter cylinder 1 of the moving disc 203, a pressure spring 207 is arranged between the adjusting pressure ring 206 and the moving disc 203, the pressure spring 207 is in a compressed state and provides an outward elastic force, the inner wall surface of the pressure distribution pipe 201 is provided with a side wall transverse groove 208, the length direction of the side wall transverse groove 208 is parallel to the axis of the pressure distribution pipe 201, the outer side surface of the adjusting pressure ring 206 is fixedly provided with a convex rib, the convex rib is limitedly matched with the side wall transverse groove 208, so that the adjusting pressure ring 206 can only move axially.

[0037] The side surface of the adjusting pressure ring 206 facing the secondary filter cartridge 2 is fixedly provided with an extrusion frame shaft 209, the side of the extrusion frame shaft 209 away from the adjusting pressure ring 206 is provided with an adjusting cone 210, the adjusting cone 210 is extruded with the extrusion frame shaft 209, the upper surface of the adjusting cone 210 is fixedly provided with a lifting bolt 211, the lifting bolt 211 is coaxially arranged with the adjusting cone 210, the surface of the pressure distribution pipe 201 is fixedly provided with a sealing sleeve 212, the lifting bolt 211 is sealingly inserted through the sealing sleeve 212, and the two are screwedly connected, the adjusting cone 210 is lifted and moved by rotating the lifting bolt 211, the extrusion frame shaft 209 is extruded, the adjusting pressure ring 206 is axially moved, the compression degree of the compression spring 207 is changed, the elastic force of the compression spring 207 is changed, and thus the adjustment of the communication pressure is completed.

[0038] The surface of the primary filter cartridge 1 is communicated with an input pipe 101, and the inside of the turbidity detection section 7 is provided with a turbidity monitoring sensor 701, which can detect the turbidity of the liquid flowing through the turbidity detection section 7. The turbidity monitoring sensor 701 is a sensor in the prior art, and the inside thereof is an infrared pair tube. When light passes through a certain amount of water, the amount of light transmission depends on the turbidity of the water. The more turbid the water, the less light is transmitted. The light receiving end converts the intensity of the transmitted light into a corresponding current. The more light is transmitted, the greater the current. Conversely, the less light is transmitted, the smaller the current. By measuring the size of the current at the receiving end, the turbidity of the water can be calculated. The filtrate that cannot be detected by the above principle is not suitable for the filter of the present application.

[0039] The lower surface of the temperature-resistant filter element 3 is communicated with an output plug pipe 301, and the lower surfaces of the inside of the primary filter cartridge 1 and the secondary filter cartridge 2 are fixedly provided with sealing plug sleeves 302, respectively. The output plug pipe 301 is sealingly and plug-in connected with the sealing plug sleeves 302. The sealing plug sleeves 302 are connected with the secondary filter cartridge 2 to form an annular water tank at the bottom. Water can be stored in the annular water tank, so that the electric heating pipe 4 is immersed in the water in the annular water tank. When the electric heating pipe 4 is electrified and heated, the water in the annular water tank can be heated to generate steam.

[0040] In use, the input pipe 101 is communicated with the liquid to be filtered, and the filtered liquid is discharged through the lower end of the drainage straight pipe 6.

[0041] In a normal state, the first valve 8 is closed, and the second valve 9 is opened. After the liquid to be filtered is input through the input pipe 101, it is filtered by the temperature-resistant filter element 3 in the primary filter cartridge 1, enters the shunt bottom pipe 5, passes through the turbidity detection section 7, and then enters the drainage straight pipe 6 to be discharged downward.

[0042] When the temperature-resistant filter element 3 in the primary filter cartridge 1 is damaged or leaks, the turbidity of the filtrate rises, which is detected by the turbidity monitoring sensor 701, so that the first valve 8 is opened and the second valve 9 is closed, the filtrate is input into the interior of the secondary filter cartridge 2 through the first valve 8, and is subjected to secondary filtration, and then is returned to the drain straight pipe 6 through the secondary filtrate pipe 10 and is discharged downward.

[0043] After the temperature-resistant filter element 3 in the primary filter cartridge 1 is replaced, the turbidity of the filtrate decreases, which is detected by the turbidity monitoring sensor 701, so that the first valve 8 is closed and the second valve 9 is opened, at this time, the locking drive cylinder 1011 is extended, the drive ring 1009 is driven to rise, the lifting locking ring 1005 is driven to move upward by the lifting light shaft 1007, the lifting locking ring 1005 is pressed below the one-way plug 1002, the one-way plug 1002 is locked, so that the secondary filter cartridge 2 is in a completely closed state, the electric heating pipe 4 is powered to heat, so that high-temperature steam is generated in the secondary filter cartridge 2, and since the secondary filter cartridge 2 is in a closed state, it has a high-pressure, high-temperature and high-pressure environment, which can sterilize the temperature-resistant filter element 3 and other structures in the secondary filter cartridge 2; after sterilization is completed, the locking drive cylinder 1011 is retracted, so that the lifting locking ring 1005 is lowered, the one-way plug 1002 is lowered under the action of high pressure to release pressure and exhaust, and after the exhaust is completed, the one-way plug 1002 is automatically kept closed.

[0044] When the filtration flow input by the input pipe 101 exceeds the pressure limit of the temperature-resistant filter element 3, the pressure acting on the end face of the sealing plug 205 is greater than the supporting force of the pressing spring 207, so that the moving disc 203 retreats, thereby opening the sealing ring table 202, the liquid in the primary filter cartridge 1 enters the secondary filter cartridge 2 through the sealing ring table 202 and the disc hole 204, and is branched, thereby reducing the upper limit of the pressure in the primary filter cartridge 1, so that the temperature-resistant filter element 3 in the primary filter cartridge 1 is less likely to be damaged, and is suitable for various places with large pressure fluctuations.

[0045] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A precision filter with secondary filtration, comprising a primary filter cartridge (1) and a secondary filter cartridge (2), characterized in that: The first-stage filter cartridge (1) and the second-stage filter cartridge (2) are respectively provided with heat-resistant filter elements (3). The bottom of the first-stage filter cartridge (1) is connected to a diversion bottom pipe (5), and the bottom of the second-stage filter cartridge (2) is connected to a drain straight pipe (6). One end of the diversion bottom pipe (5) is connected to the heat-resistant filter element (3) in the first-stage filter cartridge (1), and the other end is connected to the drain straight pipe (6). The diversion bottom pipe (5) is provided with a turbidity detection section (7). The drain straight pipe (6) is provided with a first valve (8) and a second valve (9). The first valve (8) is located above the second valve (9). The connection port between the diversion bottom pipe (5) and the drain straight pipe (6) is located between the first valve (8) and the second valve (9). The surface of the drain straight pipe (6) is connected to a secondary filtrate pipe (10) below the second valve (9). The other end of the secondary filtrate pipe (10) is connected to the heat-resistant filter element (3) in the second-stage filter cartridge (2). An electric heating tube (4) is installed near the bottom of the interior of the secondary filter cartridge (2). A one-way structure with a locking function is installed on the secondary filtrate tube (10). The one-way structure includes a control compartment (1001), a one-way plug (1002), a positioning ring (1003), and a one-way spring (1004). The control compartment (1001) is connected to the secondary filtrate tube (10). A one-way plug (1002) is installed inside the control compartment (1001). The one-way plug (1004)... 2) The upward movement can cooperate with the control compartment (1001) to block the secondary filtrate pipe (10). A positioning ring (1003) is fixedly installed on the lower surface of the control compartment (1001). A one-way spring (1004) is installed inside the positioning ring (1003). The upper end of the one-way spring (1004) rests on the lower surface of the one-way blockage (1002). A lifting locking ring (1005) is sleeved on the outside of the one-way spring (1004). The inner diameter of the lifting locking ring (1005) is smaller than that of the control compartment (1002). The diameter of the one-way blockage (1002), the lifting lock ring (1005) and the one-way spring (1004) do not contact each other, the surface of the lifting lock ring (1005) is provided with a through liquid hole (1006), the upper surface of the lifting lock ring (1005) is fixedly provided with a lifting optical shaft (1007); the upper surface of the control compartment (1001) is provided with a sealing bushing (1008), the lifting optical shaft (1007) passes through the sealing bushing (1008) in a sealed manner, the lifting optical shaft (1007) (1002) is fixedly provided with a through liquid hole (1006), the upper surface of the lifting lock ring (1005) is fixedly provided with a lifting optical shaft (1007), the upper surface of the control compartment (1001) is provided with a sealing bushing (1008), the lifting optical shaft (1007) passes through the sealing bushing (1008) in a sealed manner, the lifting optical shaft (1002) is fixedly provided with a through liquid hole (1006), the upper surface of the lifting lock ring (1005) is fixedly provided with a lifting optical shaft (1007), the upper surface of the control compartment (1001) is provided with a sealing bushing (1008), the upper surface of the control compartment (1002) is fixedly provided with a sealing bushing (1008), the upper surface of the control compartment (1002) is fixedly provided with a sealing bushing (1007 ... through liquid hole (1006), the upper surface of the control compartment (1002) is fixedly provided with a through liquid hole (1006 A drive ring (1009) is fixedly provided at the upper end of 07), and a support ear plate (1010) is fixedly provided on the outer surface of the drive ring (1009). A locking drive cylinder (1011) is provided below the support ear plate (1010). The locking drive cylinder (1011) can drive the support ear plate (1010) to move up and down. A right angle bracket plate (1012) is fixedly provided on the outside of the locking drive cylinder (1011). The right angle bracket plate (1012) is fixedly installed with the secondary filter cartridge (2).

2. The precision filter with secondary filtration according to claim 1, characterized in that: A pressure connection structure with adjustable function is provided between the primary filter cartridge (1) and the secondary filter cartridge (2).

3. A precision filter with secondary filtration according to claim 2, characterized in that: The pressure connection structure includes a pressure-dividing pipe (201), a sealing ring platform (202), a movable disk (203), a disk surface through hole (204), and a sealing plug (205). One end of the pressure-dividing pipe (201) is connected to the primary filter cartridge (1), and the other end is connected to the secondary filter cartridge (2). A sealing ring platform (202) is fixedly provided on the inner wall surface of the pressure-dividing pipe (201). A movable disk is provided on the side of the sealing ring platform (202) away from the primary filter cartridge (1). The moving disk (203) has through holes (204) on its surface. The through holes (204) are evenly distributed in a circumferential array. A sealing plug (205) is fixedly provided on the side of the moving disk (203) facing the sealing ring platform (202). The sealing plug (205) is inserted into the inner ring of the sealing ring platform (202) and is in sealing contact with the inner ring surface of the sealing ring platform (202).

4. A precision filter with secondary filtration according to claim 3, characterized in that: An adjusting pressure ring (206) is provided in the pressure-distributing pipe (201). The adjusting pressure ring (206) is located on the side of the moving disk (203) away from the primary filter cylinder (1). A pressure spring (207) is provided between the adjusting pressure ring (206) and the moving disk (203). The pressure spring (207) is in a compressed state and provides elastic force outward. A side wall transverse groove (208) is provided on the inner wall surface of the pressure-distributing pipe (201). The length direction of the side wall transverse groove (208) is parallel to the axis of the pressure-distributing pipe (201). A protruding rib is fixedly provided on the outer surface of the adjusting pressure ring (206). The protruding rib is limited and matched with the side wall transverse groove (208), so that the adjusting pressure ring (206) can only move axially.

5. A precision filter with secondary filtration according to claim 4, characterized in that: On the side of the adjusting pressure ring (206) facing the secondary filter cartridge (2), a pressing frame shaft (209) is fixedly provided. On the side of the pressing frame shaft (209) away from the adjusting pressure ring (206), an adjusting cone (210) is provided. The adjusting cone (210) is pressed and engaged with the pressing frame shaft (209). A lifting bolt (211) is fixedly provided on the upper surface of the adjusting cone (210). The lifting bolt (211) is coaxially arranged with the adjusting cone (210). A sealing screw sleeve (212) is fixedly provided on the surface of the pressure distribution pipe (201). The lifting bolt (211) passes through the sealing screw sleeve (212) and the two are screwed together.

6. A precision filter with secondary filtration according to claim 1, characterized in that: The surface of the primary filter cartridge (1) is connected to an input pipe (101), and the turbidity detection section (7) is equipped with a turbidity monitoring sensor (701). The turbidity monitoring sensor (701) can detect the turbidity of the liquid flowing through the turbidity detection section (7).

7. A precision filter with secondary filtration according to claim 1, characterized in that: The lower surface of the heat-resistant filter element (3) is connected to an output tube (301), and the lower inner surfaces of the primary filter cartridge (1) and the secondary filter cartridge (2) are respectively fixedly provided with sealing sleeves (302). The output tube (301) and the sealing sleeves (302) are sealed and plugged into each other.

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