CN112933697A - Automatic backwashing filter and working method - Google Patents
Automatic backwashing filter and working method Download PDFInfo
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- CN112933697A CN112933697A CN202110178517.XA CN202110178517A CN112933697A CN 112933697 A CN112933697 A CN 112933697A CN 202110178517 A CN202110178517 A CN 202110178517A CN 112933697 A CN112933697 A CN 112933697A
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- 238000011001 backwashing Methods 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 150
- 238000001914 filtration Methods 0.000 claims abstract description 78
- 239000012535 impurity Substances 0.000 claims abstract description 61
- 239000010865 sewage Substances 0.000 claims abstract description 32
- 238000011010 flushing procedure Methods 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 230000009471 action Effects 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 19
- 238000013016 damping Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 12
- 239000004579 marble Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000741 silica gel Substances 0.000 claims description 5
- 229910002027 silica gel Inorganic materials 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000007790 scraping Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012065 filter cake Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
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- 230000008929 regeneration Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/23—Supported filter elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6407—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes
- B01D29/6415—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
- B01D29/688—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with backwash arms or shoes acting on the cake side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/30—Filter housing constructions
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
An automatic back-flushing filter and a working method thereof are suitable for filtering impurities in sewage. The flow switching valve comprises a flow switching main valve, a flow distribution plate and a cylinder body, wherein the flow distribution plate is arranged on an upper opening of the cylinder body, and the main valve is arranged on the flow distribution plate and communicated with the inside of the cylinder body through a flow passage; the valve plate is provided with two flow passages, one is a filtering flow passage communicated with the space in the filtering net, and the other is a back flushing flow passage communicated with the space between the filtering net and the cylinder; the main valve for switching the flow channel comprises a valve body, wherein a drain outlet, a water inlet and a water outlet are sequentially arranged on the valve body from left to right, and a filtering outlet connected with the filtering flow channel and a backwashing outlet connected with the backwashing flow channel are sequentially arranged below the valve body from left to right; two-position five-way reversing valve sets are arranged among the sewage outlet, the water inlet, the water outlet, the filtering outlet and the backwashing outlet, and the normal working mode or the backwashing mode can be automatically switched according to the blocking condition of the filter screen. The structure is simple, no energy is consumed, and the back washing is automatically switched.
Description
Technical Field
The invention relates to an automatic backwashing filter and a working method thereof, in particular to an automatic backwashing filter which is suitable for filtering impurities in sewage in industrial and mining enterprise production.
Background
The back washing filter is a precise device which directly intercepts impurities in water by using a filter screen, removes suspended matters and particles in the water body, reduces turbidity, purifies water, reduces the generation of system dirt, bacteria, algae, rust and the like, and purifies the water and protects other devices of the system to normally work. The back washing filter can be installed in any position of any direction in a vertical type, a horizontal type and an inverted type, and can be used for filtering water in various industries such as industry, agriculture, municipal electric power, electronics, medicine, food, printing and dyeing, building, steel, metallurgy, papermaking and the like.
The backwashing filter is also automated due to the development of intellectualization (PLC, PAC).
The cleaning of the automatic backwashing filter can be divided into manual flushing and automatic flushing in terms of control mode. The former filter mostly adopts manual cleaning, need pull down the filter net during the washing and wash, and the process is more loaded down with trivial details, and manual cleaning all relies on the experience of purger to wash in addition, therefore the effect is not ideal. In order to meet the requirements of the accuracy of the automatic backwashing filter and save human resources, the backwashing-controlled filter is suitable for the scene, and the specific operation process is that the filter transmits differential pressure information to a filter control system through a sensor, and the filter is subjected to a series of treatments, and an output device is controlled according to certain conditions to perform automatic backwashing operation on the filter. The automatic back-flushing filter can be used for filtering light chemical industry wastewater and circulating water such as industrial water, seawater, food, pharmacy and the like, and filtering treatment such as emulsion regeneration, waste oil, liquid raw materials and the like. In the water supply and drainage and circulating water systems of the metallurgical industry, the petrochemical industry and the power plant, and the processes related to liquid medium filtration and the like, the application of automatic back-flushing filters is increasingly wide, continuous casting water systems, blast furnace water systems, high-pressure water descaling systems for hot rolling, emulsion systems and closed water circulating systems introduced by modern metallurgical enterprises in China are adopted, and the automatic back-flushing filters are adopted in the liquid medium filtration systems in large quantity. Therefore, the design of a device capable of automatically cleaning the filter screen, namely an automatic back-flushing filter, has very important significance for improving the water quality, reducing pollution and saving cost.
The existing back washing equipment is characterized in that liquid flows in from a lower inlet of an automatic back washing filter in a filtering stage, wherein part of the liquid can directly flow in from the lower end of a filter element, and the other part of the liquid enters the top of the filter from a middle flow dividing pipe and then flows in from the upper end of the filter element. After the liquid penetrates through the inner surface of the filter element, the liquid flows out from an upper outlet of the filter, particle impurities are intercepted on the inner surface of the filter element, and when the impurities are accumulated to gradually form a filter cake, the filtering flow is also gradually reduced to form an attenuation curve.
And in the back washing stage, when the filtering pressure difference or the time reaches a set value, the self-cleaning process is started. The motor speed reducer drives the cleaning turntable to aim at one filter element, the back flush valve is automatically opened to connect the filter element with the sewage discharge pipe, the pressure difference between the outer side of the filter element and the sewage discharge port drives the cleaning liquid at the outer side to reversely wash filter cakes on the inner surface of the filter element and discharge the filter cakes into the sewage discharge pipe (in the process, other filter elements are still in a filtering state, so that the whole production line can realize continuous flow cleaning.
After the back washing of one filter element is finished, the back washing valve is closed, the motor speed reducer operates, and the cleaning turntable is driven to align the next filter element for back washing operation. And after all the filter elements are cleaned one by one, the whole backwashing process is finished, and a normal filtering stage is started.
A back flush filter that market is extensively used at present installs the axle that has the soil pick-up pipe in the middle of the filter screen, adopts the pressure differential between monitoring business turn over, export, starts driving motor through the controller and passes through transmission assembly drive soil pick-up pipe and rotate, and the drain is opened simultaneously, and impurity is discharged by the drain.
The existing backwashing filter is basically driven by a motor by means of external force when performing backwashing filtration, and cannot perform self-cleaning, so that the filtration working time of the filter is short. The invention provides an automatic backwashing filter, which utilizes the high-speed impact of wastewater to be treated to drive spiral blades in a filter screen cylinder to rotate to achieve the self-cleaning function during filtering, so that the filtering time of the filter is prolonged, and the working efficiency is improved; meanwhile, the purpose of controlling the flow channel conversion of water flow to realize backwashing can be achieved by utilizing the structure of the self-body without the help of external power.
When the filter works, water to be filtered enters the barrel body from the water inlet and flows through the filter screen, the filtered water flows out from the water outlet, and particle impurities in the water are intercepted inside the filter screen. Along with the longer working time of the filter, more and more impurities are trapped, the filtering speed is slower and slower, and the sewage continuously flows in, so that pressure difference is generated between the inlet and the outlet, when the difference value reaches a preset value, the filter starts back flushing, the pressure difference is reduced to the minimum value after the impurities are cleaned, and the device returns to the initial filtering state. The liquid in the cylinder of the existing automatic back-washing filter basically flows slowly when the filter is used for filtering, and impurities are easy to intercept on the inner wall of a filter screen to block filter holes, so that the filter area is small, and the sewage treatment capacity is insufficient.
Disclosure of Invention
Aiming at the defects of the technology, the automatic backwashing filter and the working method are provided, the structure is simple, the use is convenient, the water pressure is influenced by the amount of impurities accumulated on the filter screen, the normal working mode and the backwashing mode are automatically switched through the change of the water pressure, the manual operation is not needed, no other energy consumption is caused, the dependence on the environment is small, and the backwashing effect is good.
In order to achieve the technical purpose, the automatic backwashing filter comprises a flow channel switching main valve, a valve plate and a cylinder body, wherein the valve plate is arranged on an upper opening of the cylinder body, and the main valve is arranged on the valve plate and communicated with the inside of the cylinder body through the flow channel;
the barrel is internally provided with a filter screen with a columnar structure through a filter screen steel frame, the filter screen is arranged in the filter screen steel frame, the space in the barrel is divided into two spaces through the filter screen, the space in the filter screen is internally provided with a helical blade for scraping the inner wall of the filter screen through a shaft, and the space in the filter screen is positioned at the bottom of the barrel and is provided with an electromagnetic valve;
the flow distribution plate is provided with two flow passages, one flow passage is communicated with the space in the filter screen, and the other flow passage is a back flush flow passage communicated with the space between the filter screen and the cylinder;
the main flow channel switching valve comprises a valve body and an end cover arranged on the left side of the valve body, a drain outlet, a water inlet and a water outlet are sequentially arranged on the valve body from left to right, and a filtering outlet connected with the filtering flow channel and a backwashing outlet connected with the backwashing flow channel are sequentially arranged below the valve body from left to right; wherein, a two-position five-way reversing valve group which automatically switches a normal working mode or a backwashing mode according to the blockage condition of the filter screen is arranged among the sewage outlet, the water inlet, the water outlet, the filtering outlet and the backwashing outlet;
the normal working mode is as follows: when the quantity of the impurities on the filter screen is within a preset normal working range, the drain outlet is blocked, the electromagnetic valve is closed, the water inlet is communicated with the filter flow channel and filters the water inlet impurities through the filter screen, the filtered water is discharged from the water outlet through the backwashing flow channel, and the impurities are left in the filter screen;
the backwashing working mode is as follows: when the impurity on the filter screen exceeds the preset normal working range and causes serious blockage, the reversing valve realizes reversing under the action of pressure difference, at the moment, the water outlet is blocked, the water inlet is communicated with the back flushing flow passage, and the water inlet flushes the impurity blocked and attached to the inner wall of the filter screen under the action of water pressure and discharges the impurity from the sewage outlet.
The water inlet of the two-position five-way reversing valve group is arranged between the drain outlet and the water outlet, the spacing distance is equal, and the filtering outlet and the backwashing outlet are just right under the space among the drain outlet, the water inlet and the water outlet, so that the drain outlet, the water inlet and the water outlet, the filtering outlet and the backwashing outlet are arranged in a staggered manner.
The two-position five-way reversing valve group comprises a reversing valve cavity which is transversely arranged at the middle position in the valve body, a valve rod used for switching a drain outlet, a water inlet and a water outlet is arranged in the reversing valve cavity, a spring b used for switching the working mode is arranged between the valve rod and an end cover in the reversing valve cavity, a cone valve is longitudinally arranged on the left side in the valve body, the upper part of the cone valve is connected with a back flush outlet through a vertical flow channel, the cone valve is communicated with a back flush flow channel on the right side in the reversing valve cavity through the vertical flow channel, and the lower part of the cone valve is communicated with a.
The cone valve comprises a vertically arranged cone valve cavity, a nut a is arranged at the bottom of the cone valve cavity through a sealing ring, a cone valve element and a cone valve seat which are matched with each other are arranged in the cone valve cavity, a flow channel connected with the reversing valve cavity is arranged at the joint of the cone valve element and the cone valve seat, a spring d is arranged at the top of the cone valve element and the top of the cone valve cavity, a vertical flow channel outlet b is arranged at the position of the cone valve cavity at the spring d, a vertical flow channel outlet a is arranged at the back washing outlet, the vertical flow channel is respectively connected with the vertical flow channel outlet b and the vertical flow channel outlet a, and the cone valve seat is of a through structure and is communicated.
A one-way valve structure is arranged in the cone valve core and comprises a damping hole which is arranged in the cone valve core and turns right by 90 degrees, a one-way valve core is arranged at the right turning position of the damping hole through a nut b and a spring c, the one-way valve core can be opened only when liquid enters from the right side of the damping hole, and the one-way valve core can not be opened when the liquid enters from the lower part of the damping hole;
when the water pressure from the cone valve seat from the filter outlet is less than the sum of the pressure of the spring d at the top end of the cone valve spool and the water pressure from the vertical flow passage, the flow passage communicated with the right side in the reversing valve cavity is blocked, and when the water pressure from the filter outlet is greater than the sum of the pressure of the spring d at the top end of the cone valve spool and the water pressure from the vertical flow passage, the cone valve spool is jacked up by the water pressure, so that the filter outlet and the flow passage on the left side of the reversing valve cavity are led to the valve rod of the reversing valve cavity to apply pressure.
The valve rod on be equipped with three piston respectively, be equipped with the positioner who prevents unnecessary rocking to appear in the valve rod between the right side of valve rod and the spring b, positioner including the draw-in groove of setting in the switching-over valve cavity, still include the spring an that the inside perpendicular was equipped with of valve rod to and spring an is equipped with the marble that matches with the draw-in groove from top to bottom, when the valve rod was located switching-over valve cavity left side, two five-way switching-over valves were normal operating mode, when the valve rod was located switching-over valve cavity right side, positioner location, two five-way switching-over valves were back flush operating mode.
The outer side of the spiral blade is provided with the outer edge of a silica gel material, and when the spiral blade rotates under the action of water flow, the spiral blade is used for washing impurity particles attached to the interior of the filter screen.
The top end of the filter screen steel frame is connected with the valve plate in a matching mode through a clamping groove, and meanwhile the filter screen steel frame is convenient to install and disassemble.
A working method of an automatic backwashing filter specifically comprises the following steps: the two-position five-way reversing valve group automatically switches a normal working mode or a backwashing mode after the water pressure of the cone valve is changed according to the blocking condition of the filter screen;
when impurity is less on the filter screen inner wall for normal operating mode: a valve rod in the two-position five-way reversing valve group is positioned on the left side of a switching valve cavity under the action of a spring b, sewage enters the main valve cavity from a middle water inlet, enters a cylinder body through a filtering flow channel on a flow distribution cover, impurities are left in a filtering net after being filtered by the filtering net, and filtered water flows out from a water outlet; the helical blade rotates under the water outlet pressure in the filter flow channel to drive the helical blade to scrape impurities attached to the inner wall of the filter screen, and meanwhile, the rotation of the helical blade accelerates the flow of water flow in the filter screen steel frame and assists in improving the filtering efficiency; when more and more impurities which cannot be scraped off by the helical blades on the inner wall of the filter screen are increased, the pressure of a water flow channel in the filter screen steel frame is increased, the pressure of the flow channel between the filter screen steel frame and the barrel is low, after the pressure difference on two sides of the filter screen reaches a preset value determined by a spring d, water flow enters the cone valve from one side of a filter outlet, the valve core of the cone valve is jacked up under the action of the pressure, the check valve on the cone valve is in a closed state at the moment, the water flow flows into the left side of the cavity of the switching valve, the valve rod overcomes the spring b to move to the right under the pushing of the water pressure, and the elastic ball of the positioning device at the tail part of the valve; completing automatic switching of the backwashing working mode;
under the back washing working mode, water flow enters a flow channel between the cylinder and the filter screen steel frame from the water inlet through a back washing flow channel; the pressure of a flow channel in the filter screen frame is greatly reduced, the pressure of the flow channel between the filter screen frame and the barrel is increased, water flows into an upper cavity of a cone valve from a vertical flow channel outlet a to a vertical flow channel outlet b, the cone valve is closed under the action of the pressure of the upper cavity, the pressure of the flow channel between the filter screen frame and the barrel is continuously increased, impurities on the filter screen are discharged, the water flow reversely enters the interior of the filter screen steel frame, the impurities attached to the filter screen are impacted in the process, the impurities are carried and discharged from a sewage discharge port, and the backwashing work is completed;
when impurities on the filter screen are cleaned by backwashing, the pressure on the left side of the valve rod is reduced, the positioning device of the valve rod is separated and moves leftwards under the action of a right spring force, the left side cone valve is closed, liquid in the cavity on the left side of the valve rod flows out through a damping hole in a one-way valve on a valve core of the cone valve, the valve rod moves leftwards slowly, and finally the leftmost side is reset, and the backwashing filter returns to a normal working mode; and finishing a working cycle of automatic filtration and back washing.
And periodically opening an electromagnetic valve arranged at the bottom of the cylinder body to discharge impurities which are not discharged through back washing and sink to the bottom.
Has the advantages that:
the device switches the flow channel without the help of external power through the pressure difference between the inside and the outside of the filter screen and the self structural design, thereby realizing the automatic switching between flushing and backwashing; the high-speed water flow of the sewage to be treated is used for impacting the spiral blades to clean impurities on the inner wall of the filter screen, so that the energy-saving effect is achieved, meanwhile, the normal work and the back washing are switched without considering operation, and the water pressure change caused by the quantity of the impurities accumulated on the filter screen is only determined, so that the automation degree is high, and the water-saving device can be arranged in a place where workers are difficult to reach to work;
a certain time delay function is realized by using the forms of the damping hole and the one-way valve, and the length of the switching time is controlled by controlling the magnitude of the spring force; the inlet and the outlet are all concentrated at one end of the filtering device, and the external pipeline is conveniently connected. The tail part of the valve core of the main valve is additionally provided with the positioning device, and the valve core of the main valve is prevented from moving under the irregular action of pressure through the structure of the spring and the marble, so that the stability of the filtering process is ensured, the processes of flushing and backwashing are automatically switched, the uninterrupted filtering process is realized, the filtering efficiency is high, and the filtering net is convenient to replace.
The spiral blades are arranged in the filter screen cylinder, the outer sides of the blades are made of silica gel materials, the blades rotate under the impact of high-speed jet flow, and the rotation of the blades can wash impurity particles attached to the interior of the filter screen, so that the filtering time of the filter is greatly prolonged, and the working efficiency is improved; the flow channel switching is carried out by utilizing the pressure difference at the two sides of the filter screen, the back washing is carried out, an external power source is not needed, and the energy-saving and environment-friendly effects are achieved.
Drawings
FIG. 1 is a schematic cross-sectional view of an automatic backwash filter of the present invention in a filtration state;
FIG. 2 is a schematic cross-sectional view of the automatic backwash filter of the present invention in a backwash state;
FIG. 3 is a diagram of a diverter valve assembly of the automatic backwash filter of the present invention;
FIG. 4 is a main valve core structure diagram of the automatic back-flushing filter of the present invention;
FIG. 5 is a valve core structure diagram of a cone valve of the automatic back-flushing filter of the present invention;
FIG. 6 is a structural diagram of an upper cavity of a cone valve of the automatic back-flushing filter of the invention;
FIG. 7 is a cross-sectional flow path view of the automatic backwash filter of the present invention;
fig. 8 is a structure view of a spiral blade of the automatic backwashing filter of the present invention.
In the figure: 1-valve body, 2-valve rod, 3-marble, 4-spring a, 5-spring b, 6-end cover, 7-vertical flow channel outlet a, 8-valve plate, 9-gasket, 10-nut, 11-bolt, 12-cylinder, 13-electromagnetic valve, 14-shaft, 15-helical blade, 16-filter screen, 17-filter screen steel frame, 18-back flush flow channel, 19-filter flow channel, 20-nut a, 21-sealing ring, 22-cone valve seat, 23-damping hole, 24-cone valve core, 25-nut b, 26-spring c, 27-one-way valve core, 28-vertical flow channel outlet b, 29-spring d, 30-sewage outlet, 31-water inlet, 32-water outlet, 33-card slot.
Detailed Description
Embodiments of the present application are further described below with reference to the accompanying drawings:
as shown in fig. 1 and 3, the automatic backwashing filter of the invention comprises a flow channel switching main valve, a valve plate 8 and a cylinder body 12, wherein the valve plate 8 is arranged on an upper opening of the cylinder body 12, and the main valve is arranged on the valve plate 8 and is communicated with the inside of the cylinder body 12 through a flow channel; the valve plate 8 is connected with the cylinder 12 through a bolt (11), a gasket (9) and a nut (10);
a cylindrical filter screen 16 is arranged in the cylinder 12 through a filter screen steel frame 17, the filter screen 16 is arranged in the filter screen steel frame 17, the space in the cylinder 12 is divided into two spaces through the filter screen 16, a spiral blade 15 used for scraping the inner wall of the filter screen 16 is arranged in the space in the filter screen 16 through a shaft 14, and an electromagnetic valve 13 is arranged in the space in the filter screen 16, which is positioned at the bottom of the cylinder 12; the top end of the filter screen steel frame 17 is connected with the valve plate 8 in a matching way through a clamping groove, and meanwhile, the filter screen steel frame is convenient to mount and dismount;
the valve plate 8 is provided with two flow passages, one is a filtering flow passage 19 communicated with the space in the filtering net 16, and the other is a back flushing flow passage 18 communicated with the space between the filtering net 16 and the cylinder body 12;
the main flow channel switching valve comprises a valve body 1 and an end cover 6 arranged on the left side of the valve body 1, a sewage discharge outlet 30, a water inlet 31 and a water outlet 32 are sequentially arranged on the valve body 1 from left to right, and a filtering outlet connected with a filtering flow channel 19 and a backwashing outlet connected with a backwashing flow channel 18 are sequentially arranged below the valve body 1 from left to right; wherein, a two-position five-way reversing valve group which can automatically switch the normal working mode or the back flushing mode according to the blocking condition of the filter screen 16 is arranged among the sewage draining outlet 30, the water inlet 31, the water outlet 32, the filtering outlet and the back flushing outlet; the water inlet 31 of the two-position five-way reversing valve group is arranged between the sewage outlet 30 and the water outlet 32 at equal intervals, and the filtering outlet and the backwashing outlet are just positioned under the sewage outlet 30, the water inlet 31 and the water outlet 32 at intervals, so that the sewage outlet 30, the water inlet 31 and the water outlet 32 are arranged in a staggered manner with the filtering outlet and the backwashing outlet; the two-position five-way reversing valve group comprises a reversing valve cavity transversely arranged in the middle of the valve body 1, a valve rod 2 used for switching a sewage draining outlet 30, a water inlet 31 and a water outlet 32 is arranged in the reversing valve cavity, a spring b5 used for switching working modes is arranged between the valve rod 2 and an end cover 6 in the reversing valve cavity, a cone valve is longitudinally arranged on the left side of the valve body 1, a vertical flow channel is arranged between the upper part of the cone valve and the outlet b for connection, the cone valve is communicated with a right side back washing flow channel 18 in the reversing valve cavity through the vertical flow channel, and the lower part of the cone valve is communicated with a filtering outlet through.
The normal working mode is as follows: when the quantity of the impurities on the filter screen 16 is within the preset normal working range, the sewage discharge port 30 is blocked, the electromagnetic valve 13 is closed, the water inlet 31 is communicated with the filtering flow channel 19 and filters the water inlet impurities through the filter screen 16, the filtered water is discharged from the water outlet 32 through the backwashing flow channel 18, and the impurities are left in the filter screen 16;
the backwashing working mode is as follows: when the impurity on the filter screen 16 exceeds the preset normal working range and causes serious blockage, the reversing valve realizes reversing under the action of pressure difference, at the moment, the water outlet 32 is blocked, the water inlet 31 is communicated with the back washing flow channel 18, and the water inlet flushes the impurity blocked and attached to the inner wall of the filter screen 16 under the action of water pressure and discharges the impurity from the sewage outlet 30.
The cone valve comprises a cone valve cavity which is vertically arranged, the bottom of the cone valve cavity is provided with a nut a20 through a sealing ring 21, a cone valve spool 24 and a cone valve seat 22 which are matched with each other are arranged in the cone valve cavity, a runner connected with the reversing valve cavity is arranged at the joint of the cone valve spool 24 and the cone valve seat 22, as shown in fig. 6 and 7, a spring d29 is arranged at the top of the cone valve spool 24 and the top of the cone valve cavity, a vertical runner outlet b28 is arranged at the position of the cone valve cavity at the spring d29, a vertical runner outlet a7 is arranged at the backwashing outlet, the vertical runner is respectively connected with a vertical runner outlet b28 and a vertical runner outlet a7, and the cone valve seat 22 is of a through structure and is communicated with a runner of; as shown in fig. 5, a check valve structure is arranged in the cone valve core 24, the check valve structure comprises a damping hole 23 which is arranged in the cone valve core 24 and turns right by 90 degrees, a one-way valve core 27 is arranged at the right turning position of the damping hole 23 through a nut b25 and a spring c26, the one-way valve core 27 is opened only when liquid enters from the right side of the damping hole 23, and the one-way valve core 27 is not opened when the liquid enters from the lower part of the damping hole; when the water pressure from the cone valve seat 22 at the filtering outlet is smaller than the sum of the pressure of the spring d29 at the top end of the cone valve core 24 and the water pressure from the vertical flow passage, the flow passage communicated with the right side in the reversing valve cavity is blocked, and when the water pressure from the filtering outlet is larger than the sum of the pressure of the spring d29 at the top end of the cone valve core 24 and the water pressure from the vertical flow passage, the cone valve core 24 is jacked up by the water pressure, so that the filtering outlet and the flow passage at the left side of the reversing valve cavity are guided to the valve rod 2 of the reversing valve cavity to apply pressure.
As shown in fig. 8, the outer side of the spiral blade 15 is provided with an outer edge of silica gel material, and when the spiral blade 15 rotates under the action of water flow, the silica gel material washes away foreign particles attached to the inside of the filter screen 16.
A working method using the automatic backwashing filter specifically comprises the following steps: the two-position five-way reversing valve group automatically switches the normal working mode or the back flushing mode after the water pressure of the cone valve is changed according to the blocking condition of the filter screen 16;
when the inner wall of the filter screen 16 has less impurities, the filter screen is in a normal working mode: the valve rod 2 in the two-position five-way reversing valve group is positioned on the left side of the switching valve cavity under the action of a spring b5, sewage enters the main valve cavity from the middle water inlet 31, enters the cylinder 12 through the filtering flow channel 19 on the flow distribution cover 8, impurities are left in the filtering net 16 after being filtered by the filtering net 16, and filtered water flows out from the water outlet 32; the helical blade 15 rotates under the water outlet pressure in the filtering flow channel 19 to drive the helical blade 15 to scrape impurities attached to the inner wall of the filtering net 16, and meanwhile, the rotation of the helical blade 15 accelerates the flow of water flow in the filtering net steel frame 17 to assist in improving the filtering efficiency; when more and more impurities which cannot be scraped off by the helical blades 15 on the inner wall of the filter screen 16 are increased, the pressure of a water flow channel in the filter screen steel frame 17 is increased, the pressure of the flow channel between the filter screen steel frame 17 and the barrel 12 is low, after the pressure difference between two sides of the filter screen 16 reaches a preset value determined by a spring d29, water flows into the cone valve from one side of a filter outlet, the valve core 24 of the cone valve is jacked up under the action of pressure, at the moment, the one-way valve on the cone valve is in a closed state, the water flows into the left side of the cavity of the switching valve, the valve rod 2 overcomes the spring b5 to move rightwards under the pushing of the water pressure, the marble 3 of the tail part of the valve core of the main valve clamps the clamping; completing automatic switching of the backwashing working mode;
as shown in fig. 2, in the back-washing operation mode, water flows from the water inlet 31 through the back-washing flow passage 18 into the flow passage between the cylinder 12 and the filter screen steel frame 17; the pressure of the flow channel in the filter screen frame 17 is greatly reduced, the pressure of the flow channel between the filter screen frame 17 and the cylinder body 12 is increased, water flows into an upper cavity of the cone valve from the vertical flow channel outlet a7 to the vertical flow channel outlet b28, the cone valve is closed under the action of the pressure of the upper cavity, the pressure of the flow channel between the filter screen frame 17 and the cylinder body 12 is continuously increased to discharge impurities on the filter screen 16, the water flows reversely enter the inside of the filter screen steel frame 17, in the process, the impurities attached to the filter screen 16 are impacted, and the impurities are carried and discharged from the sewage discharge outlet 30, so that the back washing work;
when the impurities on the filter screen 16 are cleaned by backwashing, the pressure on the left side of the valve rod 2 is reduced, the positioning device of the valve rod 2 is separated and moves leftwards under the action of the force of the right-side spring 5, the left-side cone valve is closed at the moment, liquid in the cavity on the left side of the valve rod 2 flows out through the damping hole 23 in the one-way valve on the valve core 24 of the cone valve, the valve rod 2 moves leftwards slowly, the leftmost side is reset finally, and the backwashing filter returns to the normal working mode; and finishing a working cycle of automatic filtration and back washing.
A solenoid valve 13 provided at the bottom of the cylinder 12 is periodically opened to discharge impurities which have not settled by the back-washing discharge.
Claims (10)
1. An automatic back flush filter which is characterized in that: the flow switching valve comprises a flow switching main valve, a flow distribution disc (8) and a cylinder body (12), wherein the flow distribution disc (8) is arranged on an upper opening of the cylinder body (12), and the main valve is arranged on the flow distribution disc (8) and communicated with the inside of the cylinder body (12) through a flow passage;
wherein a filter screen (16) with a columnar structure is arranged in the cylinder body (12) through a filter screen steel frame (17), the filter screen (16) is arranged in the filter screen steel frame (17), the space in the cylinder body (12) is divided into two spaces through the filter screen (16), a spiral blade (15) used for scraping the inner wall of the filter screen (16) is arranged in the space in the filter screen (16) through a shaft (14), and an electromagnetic valve (13) is arranged in the space in the filter screen (16) and positioned at the bottom of the cylinder body (12);
the valve plate (8) is provided with two flow passages, one is a filtering flow passage (19) communicated with the space in the filtering net (16), and the other is a back flushing flow passage (18) communicated with the space between the filtering net (16) and the cylinder body (12);
the main flow channel switching valve comprises a valve body (1) and an end cover (6) arranged on the left side of the valve body (1), a sewage outlet (30), a water inlet (31) and a water outlet (32) are sequentially arranged on the valve body (1) from left to right, and a filtering outlet connected with a filtering flow channel (19) and a backwashing outlet connected with a backwashing flow channel (18) are sequentially arranged below the valve body (1) from left to right; wherein a two-position five-way reversing valve group which automatically switches a normal working mode or a backwashing mode according to the blocking condition of the filter screen (16) is arranged between the sewage draining outlet (30), the water inlet (31), the water outlet (32) and the filtering outlet and the backwashing outlet;
the normal working mode is as follows: when the quantity of impurities on the filter screen (16) is within a preset normal working range, the sewage draining outlet (30) is blocked, the electromagnetic valve (13) is closed, the water inlet (31) is communicated with the filtering flow channel (19) and filters the water inlet impurities through the filter screen (16), the filtered water is discharged from the water outlet (32) through the backwashing flow channel (18), and the impurities are left in the filter screen (16);
the backwashing working mode is as follows: when the impurities on the filter screen (16) exceed the preset normal working range and cause serious blockage, the reversing valve realizes reversing under the action of pressure difference, the water outlet (32) is blocked at the moment, the water inlet (31) is communicated with the backwashing flow channel (18), and the water inlet flushes the impurities blocked and attached to the inner wall of the filter screen (16) under the action of water pressure and discharges the impurities from the sewage outlet (30).
2. The automatic backwash filter as defined in claim 1, wherein: the water inlet (31) of the two-position five-way reversing valve group is arranged between the sewage outlet (30) and the water outlet (32) at equal intervals, and the filtering outlet and the backwashing outlet are just positioned under the sewage outlet (30), the water inlet (31) and the water outlet (32) at intervals, so that the sewage outlet (30), the water inlet (31) and the water outlet (32) are arranged in a staggered manner with the filtering outlet and the backwashing outlet.
3. The automatic backwash filter as defined in claim 1, wherein: the two-position five-way reversing valve group comprises a reversing valve cavity transversely arranged at the middle position in a valve body (1), a valve rod (2) used for switching a drain outlet (30), a water inlet (31) and a water outlet (32) is arranged in the reversing valve cavity, a spring b (5) used for switching the working mode is arranged between the valve rod (2) and an end cover (6) in the reversing valve cavity, a cone valve is longitudinally arranged on the left side in the valve body (1), a vertical flow channel is arranged between the upper part of the cone valve and a back washing outlet and connected with the cone valve, the cone valve is communicated with a back washing flow channel (18) on the right side in the reversing valve cavity through the vertical flow channel, and the lower part of the cone valve.
4. The automatic backwash filter as defined in claim 3, wherein: the cone valve comprises a vertically arranged cone valve cavity, a nut a (20) is arranged at the bottom of the cone valve cavity through a sealing ring (21), a cone valve core (24) and a cone valve seat (22) which are matched with each other are arranged in the cone valve cavity, a flow channel connected with the reversing valve cavity is arranged at the joint of the cone valve core (24) and the cone valve seat (22), a spring d (29) is arranged at the top of the cone valve core (24) and the top of the cone valve cavity, a vertical flow channel outlet b (28) is arranged at the position of the cone valve cavity at the spring d (29), a vertical flow channel outlet a (7) is arranged on the backwashing outlet, the vertical flow channel is respectively connected with the vertical flow channel outlet b (28) and the vertical flow channel outlet a (7), and the cone valve seat (22) is of a through structure and is.
5. The automatic backwash filter as defined in claim 4, wherein: a one-way valve structure is arranged in the cone valve core (24), the one-way valve structure comprises a damping hole (23) which is arranged in the cone valve core (24) and turns right by 90 degrees, a one-way valve core (27) is arranged at the right turning position of the damping hole (23) through a nut b (25) and a spring c (26), the one-way valve core (27) can be opened only when liquid enters from the right side of the damping hole (23), and the one-way valve core (27) can not be opened when the liquid enters from the lower part of the damping hole;
when the water pressure from the filtering outlet of the cone valve seat (22) is less than the sum of the pressure of a spring d (29) at the top end of the cone valve core (24) and the water pressure from the vertical flow passage, the flow passage communicated with the right side in the reversing valve cavity is blocked, and when the water pressure from the filtering outlet is greater than the sum of the pressure of the spring d (29) at the top end of the cone valve core (24) and the water pressure from the vertical flow passage, the cone valve core (24) is jacked up by the water pressure, so that the filtering outlet and the flow passage on the left side of the reversing valve cavity are guided to the valve rod (2) of the reversing valve cavity to apply pressure.
6. The automatic backwash filter as defined in claim 3, wherein: valve rod (2) on be equipped with three piston respectively, be equipped with between the right side of valve rod (2) and spring b (5) and prevent that unnecessary positioner who rocks from appearing in valve rod (2), positioner including setting up draw-in groove (33) in the switching-over valve cavity, still include spring a (4) that valve rod (2) inside was equipped with perpendicularly to and spring a (4) are equipped with marble (3) that match with draw-in groove (33) from top to bottom, when valve rod (2) are located switching-over valve cavity left side, two five-way switching-over valves are normal operating mode, when valve rod (2) are located switching-over valve cavity right side, positioner location, two five-way switching-over valves are back flush operating mode.
7. The automatic backwash filter as defined in claim 1, wherein: the outer side of the spiral blade (15) is provided with the outer edge of a silica gel material, and when the spiral blade (15) rotates under the action of water flow, impurity particles attached to the inside of the filter screen (16) are washed.
8. The automatic backwash filter as defined in claim 1, wherein: the top end of the filter screen steel frame (17) is connected with the valve plate (8) in a matching mode through a clamping groove, and meanwhile the filter screen steel frame is convenient to install and disassemble.
9. A method of operating an automatic backwash filter according to any of the preceding claims, comprising: the two-position five-way reversing valve group automatically switches a normal working mode or a back flushing mode after the water pressure of the cone valve is changed according to the blocking condition of the filter screen (16);
when the inner wall of the filter screen (16) has less impurities, the filter screen is in a normal working mode: a valve rod (2) in the two-position five-way reversing valve group is positioned on the left side of a switching valve cavity under the action of a spring b (5), sewage enters the main valve cavity from a middle water inlet (31), enters a cylinder body (12) through a filtering flow passage (19) on a flow distribution cover (8), impurities are left in a filter screen (16) after being filtered by the filter screen (16), and filtered water flows out from a water outlet (32); the spiral blade (15) rotates under the water pressure of the outlet water in the filter flow channel (19) to drive the spiral blade (15) to scrape impurities attached to the inner wall of the filter screen (16), and meanwhile, the rotation of the spiral blade (15) accelerates the flow of water flow in the filter screen steel frame (17) to assist in improving the filtering efficiency; when more and more impurities which cannot be scraped off by the helical blades (15) on the inner wall of the filter screen (16) are generated, the pressure of a water flow channel in the filter screen steel frame (17) is increased, the pressure of the flow channel between the filter screen steel frame (17) and the barrel (12) is low, after the pressure difference between two sides of the filter screen (16) reaches a preset value determined by a spring d (29), water enters the cone valve from one side of a filter outlet, a cone valve core (24) of the cone valve is jacked up under the action of the pressure, at the moment, the one-way valve on the cone valve is in a closed state, the water flows into the left side of a cavity of the switching valve, the valve rod (2) overcomes the spring b (5) to move rightwards under the pushing of the water pressure, a marble (3) of a positioning device at the tail part of the main valve core clamps a clamping groove; completing automatic switching of the backwashing working mode;
under the back washing working mode, water flow enters a flow channel between the cylinder body (12) and the filter screen steel frame (17) from the water inlet (31) through the back washing flow channel (18); the flow channel pressure in the filter screen frame (17) is greatly reduced, the flow channel pressure between the filter screen frame (17) and the cylinder body (12) is increased, water flows into an upper cavity of a cone valve from a vertical flow channel outlet a (7) to a vertical flow channel outlet b (28), the cone valve is closed under the action of the upper cavity pressure, the flow channel pressure between the filter screen frame (17) and the cylinder body (12) is continuously increased to discharge impurities on the filter screen (16), the water flows reversely enter the filter screen steel frame (17), the impurities attached to the filter screen (16) are impacted in the process, and the impurities are carried and discharged from a drain outlet (30), so that the backwashing work is completed;
when impurities on the filter screen (16) are cleaned by backwashing, the pressure on the left side of the valve rod (2) is reduced, the positioning device of the valve rod (2) is separated and moves leftwards under the action of the force of the right-side spring (5), the left-side cone valve is closed at the moment, liquid in a cavity on the left side of the valve rod (2) flows out through a damping hole (23) in the one-way valve on a valve core (24) of the cone valve, the valve rod (2) moves leftwards slowly and finally resets to the leftmost side, and the backwashing filter returns to a normal working mode; and finishing a working cycle of automatic filtration and back washing.
10. The method of operation of claim 9, wherein: an electromagnetic valve (13) arranged at the bottom of the cylinder body (12) is opened periodically to discharge impurities which are not discharged through back washing and sink to the bottom.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110178517.XA CN112933697A (en) | 2021-02-07 | 2021-02-07 | Automatic backwashing filter and working method |
| CN202110662532.1A CN113244677B (en) | 2021-02-07 | 2021-06-15 | Automatic backwashing filter and working method |
| PCT/CN2022/077606 WO2022166997A1 (en) | 2021-02-07 | 2022-02-24 | Automatic backwash filter and working method |
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| CN202110662532.1A Active CN113244677B (en) | 2021-02-07 | 2021-06-15 | Automatic backwashing filter and working method |
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2021
- 2021-02-07 CN CN202110178517.XA patent/CN112933697A/en not_active Withdrawn
- 2021-06-15 CN CN202110662532.1A patent/CN113244677B/en active Active
-
2022
- 2022-02-24 WO PCT/CN2022/077606 patent/WO2022166997A1/en active Application Filing
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022166997A1 (en) * | 2021-02-07 | 2022-08-11 | 徐州工程学院 | Automatic backwash filter and working method |
| CN113244677A (en) * | 2021-02-07 | 2021-08-13 | 徐州工程学院 | Automatic backwashing filter and working method |
| CN113730985A (en) * | 2021-09-22 | 2021-12-03 | 南京飞婕环保科技有限公司 | Automatic abluent filter |
| CN113730985B (en) * | 2021-09-22 | 2022-12-16 | 华盛龙环保科技(宁夏)有限公司 | Automatic abluent filter |
| CN114006068A (en) * | 2021-10-11 | 2022-02-01 | 生态环境部南京环境科学研究所 | Pretreatment method for resource recovery of waste power lithium battery |
| CN114050339A (en) * | 2021-10-11 | 2022-02-15 | 生态环境部南京环境科学研究所 | Dry recovery device for waste power lithium battery |
| CN114050339B (en) * | 2021-10-11 | 2022-12-27 | 生态环境部南京环境科学研究所 | Dry recovery device for waste power lithium battery |
| CN113926232A (en) * | 2021-10-29 | 2022-01-14 | 赵玉龙 | Automatic back flush filter |
| CN113926232B (en) * | 2021-10-29 | 2022-11-29 | 广西东岚新材料有限公司 | Automatic back flush filter |
| CN114100225A (en) * | 2021-11-25 | 2022-03-01 | 沃科(江苏)环保科技有限公司 | Multi-medium renewable biological filtering device |
| CN114100225B (en) * | 2021-11-25 | 2023-04-14 | 沃科(江苏)环保科技有限公司 | Multi-medium renewable biological filtering device |
| CN114149574A (en) * | 2021-12-02 | 2022-03-08 | 浙江佳人新材料有限公司 | Process for producing normal-pressure easily-dyed cationic polyester chips by chemical cyclic regeneration method |
| CN114345849A (en) * | 2022-01-07 | 2022-04-15 | 西部新锆核材料科技有限公司 | Pipeline cleaning device and cleaning method |
| CN114797259A (en) * | 2022-04-30 | 2022-07-29 | 绍兴砩特环保科技有限公司 | Energy-efficient microporous filter |
| CN115090019A (en) * | 2022-07-14 | 2022-09-23 | 江苏赛德力制药机械制造有限公司 | Full-automatic multifunctional filter |
| CN115200383B (en) * | 2022-09-19 | 2022-11-15 | 秦皇岛新特科技有限公司 | Condenser for cooling sintering flue gas |
| CN115200383A (en) * | 2022-09-19 | 2022-10-18 | 秦皇岛新特科技有限公司 | Condenser for cooling sintering flue gas |
| CN115507203A (en) * | 2022-11-21 | 2022-12-23 | 山东食益食品有限公司 | Valve structure for food cleaning and processing |
| CN116045067A (en) * | 2023-01-06 | 2023-05-02 | 宁波市奉化区诺鑫气动工程有限公司 | Delay pneumatic control valve |
| CN116045067B (en) * | 2023-01-06 | 2024-05-17 | 宁波市奉化区诺鑫气动工程有限公司 | Delay pneumatic control valve |
| CN117482617A (en) * | 2023-12-28 | 2024-02-02 | 山东建投工程检测鉴定有限公司 | Backwash sewage filter valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113244677B (en) | 2022-11-08 |
| CN113244677A (en) | 2021-08-13 |
| WO2022166997A1 (en) | 2022-08-11 |
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