Laminated composite transverse front-mounted filter with backwashing function

Abstract

The present application relates to a kind of lamination composite type transverse front filter with backwashing function, including filter bottle, filter bottle is equipped with water inlet assembly and water outlet and blowdown assembly, filter bottle is equipped with lamination composite filter unit, including filter and backwashing subunit and lamination subunit, filter and backwashing subunit are inserted in lamination subunit, filter and backwashing subunit include independent filter function section and backwashing function section;Lamination subunit is equipped with raw water cavity between filter bottle, lamination subunit and filter function section are equipped with primary purified water cavity, filter function section is equipped with secondary purified water cavity inside, raw water cavity and primary purified water cavity are communicated by the filter hole of lamination subunit, primary purified water cavity and secondary purified water cavity are communicated by the filter hole of filter function section, secondary purified water cavity is communicated with water outlet port.The front filter structure is optimized, can backwash in situ, and washing effect is good, and can match the installation space of transverse.

Description

TECHNICAL FIELD

[0001] The present application relates to a laminated composite transverse front filter with backwashing function, belonging to the technical field of water purification equipment. BACKGROUND

[0002] Municipal tap water has poor water quality due to secondary pollution such as pipeline corrosion and silt, so a front filter is usually installed on the household pipeline to improve the water quality. The filter element of the front filter on the market is mainly of a filter screen structure, and the cleaning method of the filter element includes positive flushing, backwashing, siphon cleaning or brushing.

[0003] The laminated filter is composed of a group of disc plates with grooves on both sides. The water flows through the laminated filter, and the intersection formed by the groove edges can intercept the solids in the water. Due to the surface interception and depth coagulation, the filtering effect is greatly improved. When the laminated filter needs to be cleaned, it can be easily flushed and then assembled for reuse.

[0004] Both the single filter screen structure and the laminated structure have the risk of low filtering efficiency or failure. How to effectively combine the two to play a synergistic filtering effect is a technical problem to be solved.

[0005] In addition, the front filter of the prior art is in the shape of "T", the filter bottle is installed in the machine head in a vertical manner, and the filter element is also installed in the filter bottle in a vertical arrangement. Although this structure has good filtering effect, due to the certain length of the filter bottle and the filter element, a large installation space is often occupied in the height direction during installation. Due to the restriction of the installation space, the application has great limitations.

[0006] The present application aims to provide a front filter with optimized structure, capable of in-situ backwashing, and combined with laminated filter structure and filter screen filter structure arranged horizontally. SUMMARY

[0007] One of the purposes of the present application is to solve the deficiencies of the prior art front filter and provide a laminated composite transverse front filter with backwashing function. The structure of the front filter is optimized, capable of in-situ backwashing, with good flushing effect, and capable of matching the transverse installation space, and combined with laminated filter structure and filter screen filter structure, effectively combining the two to play a synergistic filtering effect.

[0008] The technical scheme adopted by the present application to solve the technical problems is:

[0009] The invention discloses a filter with backwashing function, which comprises a filter bottle, an inlet assembly at one end of the filter bottle, and a water outlet and sewage discharge assembly at the other end of the filter bottle, wherein the water outlet and sewage discharge assembly is provided with a base matched with the end of the filter bottle, a water outlet port and a sewage discharge port, the base is provided with a base cavity, the filter bottle is provided with a laminated composite filter unit, the laminated composite filter unit comprises a filter and backwashing subunit and a laminated subunit, the filter and backwashing subunit is inserted into the laminated subunit, the filter and backwashing subunit comprises independent filter function segments and backwashing function segments, the laminated subunit and the filter function segments are provided with a raw water cavity, the laminated subunit and the filter function segments are provided with a first purified water cavity, the filter function segments are provided with a second purified water cavity, the raw water cavity and the first purified water cavity are communicated through filter holes of the laminated subunit, the first purified water cavity and the second purified water cavity are communicated through filter holes of the filter function segments, the second purified water cavity is communicated with the water outlet port, and the raw water cavity is communicated with the base cavity and the sewage discharge port, the raw water cavity and the inlet assembly are provided with an inlet channel, the inlet assembly is provided with a backwashing flow channel control cover, the backwashing function segments are provided with a backwashing water channel and located in the backwashing flow channel control cover, the filter and backwashing subunit and the base or the laminated subunit are provided with an adjusting assembly, the filter and backwashing subunit can move axially relative to the laminated subunit through cooperation of the adjusting assembly, the filter and backwashing subunit can close the inlet channel and open the backwashing water channel by moving axially along the water flow direction, and the filter and backwashing subunit can open the inlet channel and close the backwashing water channel by moving axially against the water flow direction.

[0010] Preferably, the inlet assembly comprises an inlet connector and an inlet end cover, the inlet connector is axially fixedly connected with the filter bottle, the inlet end cover is coaxially arranged at the inner end of the inlet connector, the inlet end cover is provided with a plurality of end cover water passing channels, the end cover water passing channels are communicated with the inner cavity of the inlet connector, the backwashing flow channel control cover is fixedly arranged at the inner end of the inlet end cover or integrally formed with the inlet end cover, the filter and backwashing subunit can close the inlet channel and open the backwashing water channel by moving axially along the water flow direction relative to the laminated subunit, and the filter and backwashing subunit can open the inlet channel and close the backwashing water channel by moving axially against the water flow direction relative to the laminated subunit.

[0011] Preferably, the adjusting assembly is arranged between the backwashing subunit and the base, and comprises an elastic reset member, which is sleeved on the filtering and backwashing subunit, and the two ends of the elastic reset member are respectively in abutment with the inner wall of the base and the end of the filtering and backwashing subunit, and there is a pressure difference △P between the two sides of the end of the filtering and backwashing subunit, and △P≥0, when the corresponding force of △P is greater than the counterforce of the elastic reset member, the elastic reset member is compressed, and the filtering and backwashing subunit moves axially along the water flow direction; when the corresponding force of △P is less than the counterforce of the elastic reset member, the elastic reset member resets, and the filtering and backwashing subunit moves axially against the water flow direction.

[0012] Alternatively, the adjusting assembly is arranged between the backwashing subunit and the laminated subunit, and comprises an elastic reset member, which is sleeved on the filtering and backwashing subunit, and the filtering and backwashing subunit is provided with a limiting portion, and the two ends of the elastic reset member are respectively in abutment with the limiting portion and the inner wall of the laminated subunit, and there is a pressure difference △P between the two sides of the end of the filtering and backwashing subunit, and △P≥0, when the corresponding force of △P is greater than the counterforce of the elastic reset member, the elastic reset member is compressed, and the filtering and backwashing subunit moves axially along the water flow direction; when the corresponding force of △P is less than the counterforce of the elastic reset member, the elastic reset member resets, and the filtering and backwashing subunit moves axially against the water flow direction.

[0013] Preferably, the filtering and backwashing subunit comprises a filter screen framework, the filter screen framework comprises a backwashing framework segment, a filtering framework segment and a water outlet port connecting segment, the backwashing framework segment is fixedly provided with a backwashing filter screen, and the filtering framework segment is fixedly provided with a filtering screen, the laminated subunit comprises a laminated framework and a plurality of laminates fixed outside the laminated framework, the two ends of the laminated framework are respectively provided with a first end cover and a second end cover, the water inlet channel is arranged on the first end cover, the filtering and backwashing subunit is inserted into the laminated subunit, and the filter screen framework is provided with a backwashing opening cover on the side of the second end cover; the second end cover is provided with a raw water water passage, the backwashing opening cover is provided with a backwashing drainage passage, and the base cavity is communicated with the raw water cavity through the raw water water passage and the backwashing drainage passage; the backwashing framework segment is provided with a sealing portion at the position close to the outer side of the first end cover, the elastic reset member is sleeved on the water outlet port connecting segment, the two ends of the elastic reset member are respectively in abutment with the inner wall of the base and the backwashing opening end cover, there is a pressure difference △P between the two sides of the backwashing opening end cover, the filtering and backwashing subunit moves axially along the water flow direction relative to the laminated subunit, and the sealing portion closes the water inlet channel; the filtering and backwashing subunit moves axially against the water flow direction relative to the laminated subunit, and the sealing portion opens the water inlet channel.

[0014] Preferably, the laminated subunit further comprises a laminated adjusting member, the laminated framework is provided with a matched adjusting portion, and the fixing of the laminates and the adjustment of the filtering aperture are realized through the cooperation of the adjusting portion and the laminated adjusting member.

[0015] Preferably, a lamination skeleton limiting part is further arranged in the pre-filter, the lamination skeleton is provided with a matched positioning part, the positioning part and the lamination skeleton limiting part are abutted and matched, the position of the lamination skeleton in the filter bottle is fixed, and a sealing element or an interference fit is arranged between the first end cover and the filter bottle.

[0016] Preferably, the elastic reset member is a ring-shaped compression spring.

[0017] Preferably, the water inlet assembly is further provided with a pressure buffer device for preventing water hammer.

[0018] Preferably, the pressure buffer device comprises a cylinder, an elastic element arranged in the cylinder and a sealing cover, the cylinder is provided with an elastic element abutting part, the two ends of the elastic element are respectively abutted with the elastic element abutting part and the inner side of the sealing cover, and the sealing cover and the inner wall of the cylinder are slidingly sealed; the outer surface of the sealing cover is communicated with the purified water cavity, when the pressure in the pre-filter is increased, the elastic element can be compressed, and after the pressure increase is removed, the elastic element can be reset.

[0019] Preferably, the blow-off port is provided with a blow-off valve, and the blow-off valve is a manual blow-off valve, an electric blow-off valve or a manual-automatic blow-off valve.

[0020] The pre-filter structure is optimized, in-situ backwashing can be realized, the washing effect is good, the installation space in the transverse direction can be matched, the lamination filter structure and the filter screen filter structure are combined, the two structures are effectively combined, and the synergistic filtering effect can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present application;

[0022] Figure 2 is Figure 1 is a schematic diagram of the filter and backwashing unit;

[0023] Figure 3 is Figure 2 is an exploded view of the present application;

[0024] Figure 4 is Figure 1 is a sectional view (filtering state) of the present application;

[0025] Figure 5 is Figure 1 is a sectional view (backwashing and blow-off state) of the present application.

[0026] In the diagram: 1. Filter bottle; 2. Inlet assembly; 21. Inlet connector; 22. Inlet end cap; 22a. End cap water passage; 3. Outlet and drain assembly; 31. Base; 32. Outlet port; 33. Drain port; 4. Filtration and backwashing subunit; 41. Filter screen frame; 42. Backwash filter screen; 43. Filter screen; 44. Backwash opening end cap; 44a. Backwash drainage channel; 45. Sealing part; 5. Disc subunit; 51. Disc frame; 52. Disc; 51a. First end cap; 51b. Second end cap; 51b1. Raw water drainage channel; 6. Backwash flow channel control cover; 7. Elastic reset component; 8. Pressure buffer device; 9. Disc adjustment component; 10. Elastic buffer component. Detailed Implementation

[0027] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0028] Example:

[0029] like Figures 1-5 As shown, a stacked disc composite transverse pre-filter with backwashing function includes a filter bottle 1. One end of the filter bottle 1 has an inlet assembly 2, and the other end has an outlet and drain assembly 3. The outlet and drain assembly 3 has a base 31 adapted to the end of the filter bottle 1, an outlet port 32, and a drain port 33. The base 31 has a base cavity. A stacked disc composite filtration unit is installed inside the filter bottle 1. The stacked disc composite filtration unit includes a filtration and backwashing sub-unit 4 and a stacked disc sub-unit 5. The filtration and backwashing sub-unit 4 is inserted into the stacked disc sub-unit 5. The filtration and backwashing sub-unit 4 includes a filtration section and a backwashing section. A raw water chamber is provided between the stacked disc sub-unit 5 and the filter bottle 1. A primary purification water chamber is provided between the stacked disc sub-unit 5 and the filtration section. A secondary purification water chamber is provided inside the filtration section. The raw water chamber and the primary purification water chamber are connected by the stacked discs. The filter holes of unit 5 are connected. The primary purification water chamber and the secondary purification water chamber are connected through the filter holes of the filtration functional section. The secondary purification water chamber is connected to the water outlet port 32. The raw water chamber is connected to the base chamber and the sewage discharge port 33. A water inlet channel is provided between the raw water chamber and the water inlet assembly 2. A backwash flow channel control cover 6 is provided inside the water inlet assembly 2. The backwash functional section is provided with a backwash water channel and is located inside the backwash flow channel control cover 6. An adjustment component is provided between the filtration and backwash subunit 4 and the base 31. With the cooperation of the adjustment component, the filtration and backwash subunit 4 can move axially relative to the stacked plate subunit 5. The filtration and backwash subunit 4 can move axially in the direction of the water inlet flow to close the water inlet channel and open the backwash water channel. The filtration and backwash subunit 4 can move axially against the direction of the water inlet flow to open the water inlet channel and close the backwash water channel.

[0030] Specific to the embodiment, the water inlet assembly 2 comprises a water inlet connector 21 and a water inlet end cover 22, the water inlet connector 21 is axially fixedly connected with the filter bottle 1 (specifically, it can be axially and circumferentially fixed, or it can be only axially fixed, and the axial direction can be rotated, such as 360-degree rotation, and a conventional selection is made as required), and the water inlet end cover 22 is coaxially arranged at the inner end of the water inlet connector 21, the water inlet end cover 22 is provided with a plurality of end cover water passing channels 22a, the end cover water passing channels 22a are in communication with the inner cavity of the water inlet connector 21, the backwashing flow channel control cover 6 is fixedly arranged at the inner end of the water inlet end cover 22 or is integrally formed with the water inlet end cover (the embodiment preferably adopts integral forming, which is convenient to process), the filter and backwashing subunit 4 moves axially relative to the laminated subunit 5 in the water inlet flow direction, the end cover water passing channel 22a can be disconnected from the water inlet channel and open the backwashing water channel, and the filter and backwashing subunit 4 moves axially relative to the laminated subunit 5 in the reverse water inlet flow direction, the end cover water passing channel 22a can be in communication with the water inlet channel and close the backwashing water channel.

[0031] In the embodiment, the adjusting assembly comprises an elastic reset member 7, the elastic reset member 7 is sleeved on the filter and backwashing subunit 4, two ends of the elastic reset member 7 are respectively in abutment with the inner wall of the base 31 and the end portion of the filter and backwashing subunit 4, there is a pressure difference ΔP on both sides of the end portion of the filter and backwashing subunit 4, ΔP≥0, when the corresponding force of ΔP is greater than the counterforce of the elastic reset member 7, the elastic reset member 7 is compressed, and the filter and backwashing subunit 4 moves axially in the water inlet flow direction; when the corresponding force of ΔP is less than the counterforce of the elastic reset member 7, the elastic reset member 7 resets, and the filter and backwashing subunit 4 moves axially in the reverse water inlet flow direction.

[0032] The structure of the filtering and backwashing subunit is further specifically described below. In this example, the filtering and backwashing subunit 4 includes a filter screen framework 41, which includes a backwashing framework section, a filtering framework section, and a water outlet port connecting section. The backwashing framework section is fixedly provided with a backwashing filter screen 42, and the filtering framework section is fixedly provided with a filter screen 43. The laminated subunit 5 includes a laminated framework 51 and a plurality of laminated sheets 52 fixed to the outside of the laminated framework 51. The laminated framework 51 is respectively provided with a first end cover 51a and a second end cover 51b at both ends. A water inlet channel 51a1 is arranged at the first end cover 51a. The filtering and backwashing subunit 4 is inserted into the laminated subunit 5. The backwashing opening cover 44 is arranged on one side of the filtering and backwashing subunit 4. The second end cover 51b is provided with a raw water passing channel 51b1. The backwashing opening cover 44 is provided with a backwashing water discharge channel 44a. The base cavity is in communication with the raw water cavity through the raw water passing channel 51b1 and the backwashing water discharge channel 44a. The backwashing framework section is provided with a sealing part 45 at a position close to the outside of the first end cover 51a. The elastic return member 7 is sleeved on the water outlet port connecting section. Both ends of the elastic return member 7 are respectively in abutment with the inner wall of the base and the backwashing opening cover 44. There is a pressure difference △P between both sides of the backwashing opening cover 44, and △P≥0. The filtering and backwashing subunit 4 moves axially relative to the laminated subunit 5 in the water inlet flow direction. The sealing part 45 can close the water inlet channel, that is, the water inlet channel 51a1 is closed by the sealing part 45, thereby blocking the communication between the water inlet channel 51a1 and the end cover water passing channel 22a. The filtering and backwashing subunit 4 moves axially relative to the laminated subunit 5 in the reverse direction of the water inlet flow direction. The sealing part 45 can open the water inlet channel, that is, after the sealing part 45 and the water inlet channel 51a1 are opened, the water inlet channel 51a1 and the end cover water passing channel 22a are in communication.

[0033] In this example, the structure of the laminated subunit 5 is specifically described as follows. The laminated subunit 5 further includes a laminated adjusting member 9. The laminated framework 51 is provided with an adaptive adjusting part. Through the cooperation of the adjusting part and the laminated adjusting member 9, the fixation of the laminated sheets and the adjustment of the filtering aperture can be realized. In the preferred scheme, the laminated adjusting member 9 and the second end cover 51b can be further provided with an elastic buffer member 10.

[0034] In this example, the filter bottle 1 is provided with a laminated framework limiting part. The second end cover 51b of the laminated framework 51 is in abutment with the laminated framework limiting part. The first end cover 51a and the filter bottle 1 are provided with a sealing element. The two ends of the filtering function section are in sliding sealing connection with the inner wall of the laminated subunit 5.

[0035] In this example, the elastic return member 7 is a ring-shaped compression spring.

[0036] Further, in order to prolong the service life of the pre-filter, the water inlet assembly 2 is further provided with a pressure buffer device 8 for preventing water hammer, which comprises a cylinder, an elastic element arranged in the cylinder, and a sealing cover, the cylinder is provided with an elastic element abutting portion, the two ends of the elastic element abut against the elastic element abutting portion and the inner side of the sealing cover respectively, and the sealing cover is in sliding sealing with the inner wall of the cylinder; the outer surface of the sealing cover is in communication with the purified water cavity, when the pressure in the pre-filter is increased, the elastic element can be compressed, and after the pressure increase is removed, the elastic element can be reset.

[0037] In the embodiment, the blowdown port 33 is provided with a blowdown valve, which is a manual blowdown valve, an electric blowdown valve, or a manual-automatic blowdown valve.

[0038] The working principle of the present application is as follows:

[0039] In the filtering state, the blowdown port 33 is closed, the base cavity is closed, the pressure difference ΔP between the two sides of the end of the filtering and backwashing subunit 4 is 0, at this time, the elastic reset member is in the initial state, the positions of the filtering and backwashing subunit 4 and the laminated subunit 5 are in the initial state, and the backwashing channel (backwashing filter screen) of the filtering and backwashing subunit 4 is located in the backwashing flow channel control cover 6, as shown in Figure 4 The raw water enters from the water inlet assembly 2, passes through the end cover water passage 22a of the water inlet end cover 22, flows through the water inlet passage 51a1, enters the raw water cavity, passes through the laminated subunit 5 for filtration, then enters the primary purified water cavity, and then passes through the filtering functional section for filtration, and then enters the secondary purified water cavity, and then is discharged through the water outlet port 32.

[0040] In the backwashing and blowdown state, the water outlet port 32 is closed, the blowdown port 33 is opened, the base cavity is opened correspondingly, the pressure difference between the two sides of the end of the filtering and backwashing subunit 4 is increased from ΔP=0 to a larger value, until the corresponding force is greater than the counterforce of the elastic reset member, at this time, the elastic reset member 7 is in the compressed state, the filtering and backwashing subunit 4 moves relative to the laminated subunit 5 in the direction of the water flow, and the backwashing channel (backwashing filter screen) of the filtering and backwashing subunit 4 extends out of the backwashing flow channel control cover 6 and is opened, as shown in Figure 5 The sealing portion 45 closes the water inlet passage, the raw water enters from the water inlet assembly 2, passes through the end cover water passage 22a of the water inlet end cover 22, flows through the backwashing filter screen, enters the secondary purified water cavity, after backwashing the filtering functional section, enters the primary purified water cavity, then backwashes the laminated subunit 5, and then flows to the raw water cavity, then passes through the raw water water passage 51b1 and the backwashing drainage passage 44a to enter the base cavity, and finally is discharged through the blowdown port 33, thereby realizing backwashing of the filtering functional section and the laminated subunit 5.

[0041] The pre-filter structure is optimized, can be back-flushed in situ, has good flushing effect, can match the transverse installation space, and combines the laminated filter structure and the filter screen filter structure, so that the two effectively combine and can play a synergistic filtering effect.

[0042] The above-described embodiments are only a preferred scheme of the present application, and do not limit the present application in any form, and other variants and modifications are possible without departing from the technical scheme recited in the claims. For example, the adjusting assembly is arranged between the filter and back-flushing subunit and the laminated subunit, specifically, the elastic reset member is sleeved on the filter screen framework 41, the filter screen framework 41 is provided with a limiting portion at the end of the filtering function section, and the two ends of the elastic reset member 7 are respectively in abutment with the limiting portion and the inner wall of the second end cover 51b. This arrangement is similar to the description in the No. 201610948125.6 Invention Patent of Back-flushable Pre-filter Assembly.

Claims

1. A stacked disc composite transverse pre-filter with backwashing function, comprising a filter bottle, wherein one end of the filter bottle is provided with a water inlet assembly and the other end is provided with a water outlet and sewage discharge assembly, characterized in that: The water outlet and wastewater discharge assembly is equipped with a base adapted to the end of the filter bottle, a water outlet port, and a wastewater discharge port. The base has a base cavity, and the filter bottle contains a stacked disc composite filter unit. The stacked disc composite filter unit includes a filtration and backwashing subunit and a stacked disc subunit. The filtration and backwashing subunit is inserted into the stacked disc subunit and includes a filtration functional section and a backwashing functional section. A raw water chamber is provided between the stacked disc subunit and the filter bottle, and a primary purification water chamber is provided between the stacked disc subunit and the filtration functional section. The filtration functional section contains a secondary purification water chamber. The purified water chamber, raw water chamber, and primary purified water chamber are connected through the filter holes of the laminated subunit. The primary purified water chamber and secondary purified water chamber are connected through the filter holes of the filtration functional section. The secondary purified water chamber is connected to the outlet port. The raw water chamber is connected to the base chamber and the sewage discharge port. An inlet channel is provided between the raw water chamber and the inlet assembly, and a backwash flow channel control cover is provided inside the inlet assembly. The backwash functional section is provided with a backwash water channel and is located inside the backwash flow channel control cover. An adjustment component is provided between the filtration and backwash subunit and the base or between the laminated subunits. The water inlet assembly includes a water inlet connector and a water inlet end cap. The water inlet connector is at least axially fixed to the filter bottle. The water inlet end cap is coaxially disposed at the inner end of the water inlet connector. The water inlet end cap is provided with a plurality of end cap water passages. The end cap water passages communicate with the inner cavity of the water inlet connector. The backwash flow channel control cover is fixedly disposed at the inner end of the water inlet end cap or integrally formed with the water inlet end cap. The filtration and backwashing subunit includes a filter screen frame, which includes a backwashing frame section, a filter frame section, and a water outlet connection section. The backwashing frame section is fixedly equipped with a backwashing filter screen, and the filter frame section is fixedly equipped with a filter screen. The stacked plate subunit includes a stacked plate frame and several stacked plates fixed outside the stacked plate frame. The stacked plate frame has a first end cover and a second end cover at both ends, respectively. The water inlet channel is located at the first end cover. The filter screen frame has a backwash opening cover on one side of the second end cover. The second end cover has a raw water passage channel, and the backwash opening cover has a backwash drainage channel. The base cavity is connected to the raw water cavity through the raw water passage channel and the backwash drainage channel. The backwashing frame section has a sealing part near the outer side of the first end cover. By adjusting the coordination of the components, the filtration and backwashing subunit can move axially relative to the disc subunit in the direction of the inlet water flow, which can open the backwash water channel and close the inlet water channel through the sealing part; the filtration and backwashing subunit can move axially relative to the disc subunit in the direction of the inlet water flow, which can close the backwash water channel and open the inlet water channel through the sealing part. The sewage discharge port is equipped with a sewage discharge valve.

2. The stacked disc composite transverse pre-filter with backwashing function according to claim 1, characterized in that, The adjustment assembly is located between the backwash subunit and the base. The adjustment assembly includes an elastic reset member, which is sleeved on the filtration and backwash subunit. The two ends of the elastic reset member abut against the inner wall of the base and the end of the filtration and backwash subunit, respectively. There is a pressure difference ΔP between the two ends of the filtration and backwash subunit. When ΔP ≥ 0, and the force corresponding to ΔP is greater than the reaction force of the elastic reset member, the elastic reset member is compressed, and the filtration and backwash subunit moves axially in the direction of the inlet water flow. When the force corresponding to ΔP is less than the reaction force of the elastic reset member, the elastic reset member is reset, and the filtration and backwash subunit moves axially against the direction of the inlet water flow. Alternatively, the adjustment component is located between the backwashing subunit and the stacked disc subunit. The adjustment component includes an elastic reset member, which is sleeved on the filtration and backwashing subunit. The filtration and backwashing subunit has a limiting part. The two ends of the elastic reset member abut against the limiting part and the inner wall of the stacked disc subunit, respectively. There is a pressure difference ΔP between the two ends of the filtration and backwashing subunit. When ΔP ≥ 0, and the force corresponding to ΔP is greater than the reaction force of the elastic reset member, the elastic reset member is compressed, and the filtration and backwashing subunit moves axially in the direction of the inlet water flow. When the force corresponding to ΔP is less than the reaction force of the elastic reset member, the elastic reset member is reset, and the filtration and backwashing subunit moves axially against the direction of the inlet water flow.

3. The stacked disc composite transverse pre-filter with backwashing function according to claim 2, characterized in that, The elastic reset component is sleeved on the water outlet connection section. The two ends of the elastic reset component abut against the inner wall of the base and the backwash opening end cover, respectively. There is a pressure difference ΔP on both sides of the backwash opening end cover.

4. The stacked disc composite transverse pre-filter with backwashing function according to claim 1 or 2, characterized in that: The stacked sheet subunit also includes a stacked sheet adjustment component. The stacked sheet frame is provided with a suitable adjustment part. Through the cooperation of the adjustment part and the stacked sheet adjustment component, the stacked sheets are fixed and the filter pore size is adjusted.

5. The stacked disc composite transverse pre-filter with backwashing function according to claim 1 or 2, characterized in that: The pre-filter is also provided with a disc frame limiting part, and the disc frame is provided with a matching positioning part. The positioning part and the disc frame limiting part abut against each other, and the position of the disc frame inside the filter bottle is fixed. A sealing element or interference fit is provided between the first end cap and the filter bottle. The two ends of the filtration functional section are slidably sealed to the inner wall of the disc sub-unit.

6. The stacked disc composite transverse pre-filter with backwashing function according to claim 2, characterized in that: The elastic reset element is a ring compression spring.

7. The stacked disc composite transverse pre-filter with backwashing function according to claim 1 or 2, characterized in that, The water inlet assembly is also equipped with a pressure buffer device to prevent water hammer.

8. The stacked disc composite transverse pre-filter with backwashing function according to claim 7, characterized in that, The pressure buffer device includes a cylinder, an elastic element disposed inside the cylinder, and a sealing cover. The cylinder has an elastic element abutment part, and the two ends of the elastic element abut against the elastic element abutment part and the inner side of the sealing cover, respectively. The sealing cover slides and seals against the inner wall of the cylinder. The outer surface of the sealing cover is connected to the purified water chamber. When the pressure in the pre-filter increases, the elastic element can be compressed. After the pressure increase is released, the elastic element can be reset.

9. The stacked disc composite transverse pre-filter with backwashing function according to claim 1 or 2, characterized in that: The drain valve is a manual drain valve, an electric drain valve, or a manual / automatic integrated drain valve.

Images