CN203043684U - Vertical self-cleaning filter - Google Patents
Vertical self-cleaning filter Download PDFInfo
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- CN203043684U CN203043684U CN 201220671540 CN201220671540U CN203043684U CN 203043684 U CN203043684 U CN 203043684U CN 201220671540 CN201220671540 CN 201220671540 CN 201220671540 U CN201220671540 U CN 201220671540U CN 203043684 U CN203043684 U CN 203043684U
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- filter
- filter screen
- high pressure
- dirt sucking
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Abstract
The utility model belongs to the technical field of purification treatment of industrial circulating water and in particular relates to a vertical self-cleaning filter. The vertical self-cleaning filter comprises a water inlet, a water outlet, a high-pressure cavity, a filtering cavity, a water inlet cavity, a dirt sucker and a high-precision filter screen, wherein the water inlet and the high-pressure cavity are respectively arranged at one end of filter; the water outlet is formed in one side of the filter; the filtering cavity is arranged inside the filter; the water inlet cavity is arranged at the upper end of the water inlet and is separated from the filtering cavity; the dirt suction device is arranged in the high-precision filter screen; the high-precision filter screen is arranged in the filtering cavity; and a certain quantity of dirt suction devices are arranged on one side of the dirt sucker. The vertical self-cleaning filter provided by the embodiment of the utility model can realize automatic filtration under a complex water quality environment, and can avoid the problem that a filtering function is influenced since a filtering system cannot realize self cleaning completely under the conditions of insufficient suction force of a suction nozzle and too low pressure of a water system so as to guarantee the self-cleaning stability of the filtering system.
Description
Technical field
The utility model belongs to industrial circulating water purification treatment technology field, relates in particular to a kind of vertical self-cleaning strainer.
Background technology
Industrial circulating water is carried out filtration device structure that in-line purification handles generally as shown in Figure 1, former water is from water inlet 91 input coarse filtration chambeies 92, through coarse strainer 93 with former water in the interception of the bigger impurity of particle, enter fine filtering chamber 94 again, further filter the back water purification from delivery port 96 discharges through fie screen 95.After the regular hour filtration, the inwall of fie screen 95 tends to gather one deck impurity, at pressure reduction that progressively increases of fie screen 95 inside and outside generations, when this pressure reduction is excessive, will have influence on the normal rate of filtration, for this reason, central authorities are provided with dirt sucking device assembly 6 vertically in the cylindricality fine filtering chamber 94 that fie screen 95 surrounds, be arranged at intervals with a plurality of suction nozzles 61 on this dirt sucking device assembly 6, this dirt sucking device assembly 6 drives the shaft joint 9 that is connected on the screw rod 8 by rotary drive motor 7, when anti-cleaning is blowdown, electromagnetism blowoff valve 11 is opened automatically, this dirt sucking device assembly 6 is done the spiral translation to blowdown chamber 12 directions under the driving of rotary drive motor 7, cause suction nozzle 61 synchronous operations, electromagnetism blowoff valve 11 is opened, cause the hurried decline of pressure in blowdown chamber 12, blowdown chamber 12 is communicated with suction nozzle 61 with this soil pick-up assembly 6, thereby with respect to the synchronous hurried decline of the pressure in fine filtering chamber 94, thereby the comprehensive sucking that suction nozzle 61 is realized the impurity that is adsorbed on fie screen 95 inner wall surface, impurity arrives blowdown chamber 12 by soil pick-up assembly 6 and is discharged by electromagnetism blowoff valve 11, reaches the purpose of cleaning.In this backwash process, current can continue to flow, thereby can realize the operation of continuous and automation.
Self-cleaning strainer wants to realize above-mentioned functions, the device that in good time detection inside and outside differential pressure must be arranged, when this pressure reduction meets or exceeds preset threshold, the electronic control unit output signal of telecommunication, above-mentioned rotary drive motor 7 drives dirt sucking device assembly 6 and does the axial screw translation, electromagnetism blowoff valve 11 is opened, and dirt sucking device assembly 6 is started working; Inside and outside differential pressure progressively reduces subsequently, rotary drive motor 7 drives and correspondingly stops action after dirt sucking device assembly 6 resets in good time, electromagnetism blowoff valve 11 cuts out, in order to avoid influence normal recirculated water filter efficiency, moves when this pressure reduction increases to aforesaid threshold values next time again.Be the control device that 200510100534.2 Chinese patent discloses a kind of self-cleaning strainer as the patent No., this control device is provided with the pressure test device for detection of the fie screen inside and outside differential pressure of filter, and control drives the cleaning driver that the dirt sucking device assembly is done axially-movable when the fie screen inside and outside differential pressure meets or exceeds certain threshold value.
Another application number is the cleaning driver that 200810066637.5 Chinese patent application file also discloses a kind of self-cleaning mechanical type filter, comprise with the piston mandril of the axial interlock of dirt sucking device assembly and piston and, the back pressure chamber that walks abreast and arrange successively from inside to outside in the piston chamber outside, trigger chamber, drive chamber, the pressure release chamber, wherein, trigger chamber and drive chamber and separated by the rigid walls liquid sealing of an activity, when in rigid walls is triggering chamber, triggering signal being arranged, to driving the motion of chamber direction, the driving chamber is communicated with and pressure release with the pressure release chamber, makes piston actuated dirt sucking device assembly become axially-movable.
Yet, even add these automatic control equipments, existing self-cleaning strainer also must carry out former water precipitation process to a certain degree earlier when filtration treatment, the removal of thing precipitation in big or the proportion particle dirt heavier than water just can carry out filtration treatment, and unconditionally precipitated at condition of water quality complexity, former water, can't carry out automatic fitration, environment such as for example Huanghe water agricultural irrigation system, snow mountain snow melt irrigation canals and ditches water droplet are irritated, the dustproof spraying of colliery water under granule foreign is big or water system pressure is lower in the water the environment; In addition, the suction that suction nozzle produces must produce according to the pressure of water system, under water system hypotony situation, the suction that suction nozzle produces relatively is not enough, be difficult to remove the large granular impurity on the fie screen, cause filter after using the long period, the fie screen surface can form certain impurity layer gradually, the filter efficiency that influences fie screen is stopped up fully until fie screen and is lost filtering function, the dirty foreign material jam of bulky grain dirt sucking device can not normally guarantee the stability that filtration system is self-cleaning by existing automatic control equipment.
The utility model content
The utility model provides a kind of vertical self-cleaning strainer, be intended to solve existing self-cleaning filtration system be not suitable under the complicated water quality environment automatic fitration and can't the complete self-cleaning technical problem that influences filtering function when the water system hypotony.
The technical scheme that the utility model provides is: a kind of vertical self-cleaning strainer, comprise water inlet, delivery port, high pressure chest, filter chamber and intake antrum, it is characterized in that, described water inlet and high pressure chest are located at an end of filter respectively, described delivery port is located at a side of filter, described filter chamber is located at filter interior, and described intake antrum is located at the upper end of water inlet and is separated with filter chamber; Described filter also comprises dirt sucking device and high accuracy filter screen, and described high accuracy filter screen is located in the filter chamber, and described dirt sucking device is located in the high accuracy filter screen, and a side of described dirt sucking device is arranged the sewage suction device of some.
The technical solution of the utility model also comprises: described filter also comprises electric cabinet, pressure test device, reductor, high-pressure pump, blow-off pipe and hydraulic control valve, described electric cabinet is located on the filter housings, described pressure test device is located at a side of electric cabinet, described reductor is located at the outside of filter, described high-pressure pump is fixed in a side of filter housings by the high-pressure pump base and is connected with electric cabinet by pressure test device, described high-pressure pump water side is connected with high pressure chest by high-voltage tube, described high-pressure pump water inlet end is connected with filter chamber by the high pressure raw water tubes, described blow-off pipe is located in the intake antrum, one end of described blow-off pipe extends to outside the intake antrum and is connected with hydraulic control valve, the other end links to each other with dirt sucking device indirectly by the dirt sucking device adapter sleeve, and described hydraulic control valve is located at a side of filter housings and is linked to each other indirectly with dirt sucking device by blow-off pipe.
The technical solution of the utility model also comprises: described filter also comprises deceleration arbor, tube connector, tube connector axle sleeve and high pressure skirt, described deceleration arbor is connected with reductor, described tube connector is located in the high pressure chest, the upper end of described tube connector is connected with the deceleration arbor, the lower end of described tube connector extends to filter chamber by end casing and is connected with dirt sucking device by the tube connector axle sleeve, has the high pressure hand-hole of some on the described tube connector; Described high pressure skirt is doorframe structure, extends downwardly into certain altitude along the high accuracy filter screen outside, and described tube connector axle sleeve is fixing high pressure skirt in opposite directions.
The technical solution of the utility model also comprises: described filter also comprises dividing plate flange, dirt sucking device adapter sleeve, adapter sleeve bracing frame, filter screen mounting flange and filter screen end caps, described dividing plate flange is used for separating intake antrum and filter chamber, described dirt sucking device adapter sleeve is fixed on the dividing plate flange by the adapter sleeve bracing frame, the described filter screen end caps of an end that described filter screen mounting flange is located at the high accuracy filter screen is located at the other end of high accuracy filter screen, and described high accuracy filter screen is fixed on the dividing plate flange by the filter screen mounting flange.
The technical solution of the utility model also comprises: the sewage suction device of described dirt sucking device one side becomes T word shape assembled arrangement by the suction nozzle support bar with suction nozzle, suction nozzle is the flat structure of hollow, the length summation of suction nozzle equals the effective length of high accuracy filter screen, and the gap between suction nozzle and the high accuracy filter screen inboard is below the 2mm; Described sewage suction device is located at the outside of dirt sucking device.
The technical solution of the utility model also comprises: a side of described high pressure skirt is arranged the high pressure nozzle of some according to group, and described high pressure nozzle is located at the inboard and corresponding with the position of suction nozzle of high pressure skirt and is arranged on the inside and outside wall of high accuracy filter screen in opposite directions.
The technical solution of the utility model also comprises: described water inlet is downward axis Installation Modes and be located at the bottom of filter straight down, and described high pressure chest, filter chamber, intake antrum and high accuracy filter screen are tubular structure.
The technical solution of the utility model has following advantage or beneficial effect: the vertical self-cleaning strainer of the utility model embodiment is by being located at the high accuracy filter screen in the filter chamber, dirt sucking device is located in the high accuracy filter screen, under comparatively complicated water quality environment, is realized automatic fitration; And at the inside and outside wall of high accuracy filter screen corresponding sewage suction device and high pressure nozzle are set respectively, surfaces externally and internally to the high accuracy filter screen carries out comprehensive cleaning simultaneously, suction nozzle suction inadequately can't the complete self-cleaning problem that influences filtering function when the water system hypotony to have solved existing filtration system, thereby guarantees the self-cleaning stability of filtration system; Vertical self-cleaning strainer among the utility model embodiment only consumes the seldom water of part in cleaning process, water system is work as usual, can not influence the normal filtration work of filter.
Description of drawings
Accompanying drawing 1 is existing industrial circulating water filter interior structural representation;
Accompanying drawing 2 is the vertical self-cleaning strainer surface structure of the utility model component diagram;
Accompanying drawing 3 is the vertical self-cleaning strainer outer structural element of the utility model side views;
Accompanying drawing 4 is the vertical self-cleaning strainer cut-away views of the utility model;
Accompanying drawing 5 is the vertical self-cleaning strainer self-cleaning device of the utility model detail drawings;
Accompanying drawing 6 is the vertical self-cleaning strainer self-cleaning device of the utility model schematic diagrams.
The specific embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
See also Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, Fig. 2 is the surface structure component diagram of the vertical self-cleaning strainer of the utility model; Fig. 3 is the outer structural element side view of the vertical self-cleaning strainer of the utility model; Fig. 4 is the vertical self-cleaning strainer cut-away view of the utility model; Fig. 5 is the self-cleaning device detail drawing of the vertical self-cleaning strainer of the utility model, and Fig. 6 is the vertical self-cleaning strainer self-cleaning device of the utility model schematic diagram.The vertical self-cleaning strainer of the utility model comprises high pressure chest 101, reductor 102, first Pressure gauge 103, end casing 104, high-voltage tube 105, electric cabinet 106, high-pressure pump 107, delivery port 108, high pressure raw water tubes 109, filter housings 110, high-pressure pump base 111, second Pressure gauge 112, hydraulic control valve 113, nameplate frame 114, water inlet 115, filter chamber 116, dividing plate flange 117, dirt sucking device adapter sleeve 118, adapter sleeve bracing frame 119, intake antrum 120, blow-off pipe 121, pressure test device 122, deceleration arbor 201, tube connector 202, dirt sucking device 203, suction nozzle support bar 204, high pressure skirt 205, suction nozzle 206, high pressure hand-hole 207, tube connector axle sleeve 208, high pressure nozzle 209, high accuracy filter screen 301, filter screen mounting flange 302 and filter screen end caps 303, wherein
The operation principle of the vertical self-cleaning strainer of the utility model is: filter normally in the duty, hydraulic control valve 113 is closed, former water enters intake antrum 120 from water inlet 115, filter chamber 116 reinjects, under the interception of high accuracy filter screen 301, dirty foreign material are intercepted at high accuracy filter screen 301 inner surfaces, and the water after handling is after filtration discharged from delivery port 108; Detect high accuracy filter screen 301 inside and outside differential pressures by pressure test device 122 in good time, when this pressure reduction meets or exceeds preset threshold, the electric cabinet that is attached thereto 106 output control signals are in order to rotate reductor 102 and through the deceleration arbor, tube connector and tube connector axle sleeve drive dirt sucking device 203 and do spinning movement with filter housings 110 axis, electric cabinet 106 output control signals are opened high-pressure pump 107 and hydraulic control valve 113 simultaneously, high-pressure pump 107 is started working, high-pressure pump 107 is got the clean water of filter chamber 116 inside through high pressure raw water tubes 109, form high pressure kinetic energy stream, the high pressure kinetic energy high-voltage tube 105 of flowing through, high pressure chest 101, behind the tube connector 202, tube connector axle sleeve 208 by distributing T-pipe is diverted on the high pressure skirt 205 of doorframe structure, and the outer surface by 209 pairs of high accuracy filter screens 301 of high pressure nozzle of arranging on the high pressure skirt 205 carries out brute force impact; Simultaneously, hydraulic control valve 113 is opened, indirect communicates dirt sucking device 203 inner cavity chamber with atmospheric pressure, dirt sucking device 203 forms negative pressure state water system pressure communicates condition with atmospheric pressure under, thereby produce suction by the suction nozzle 206 that suction nozzle support bar 204 and dirt sucking device 203 communicate indirectly, the inner surface of high accuracy filter screen 301 is sucked soil pick-up; Simultaneously since the attachment that the jet of high pressure kinetic energy stream has been promoted the strong on high accuracy filter screen 301 inner surfaces from high accuracy filter screen 301 outer surfaces flushing filter screen come off; Most of water of inspiration and dirty foreign material mixture are by suction nozzle 206 process dirt sucking devices 203, blow-off pipe 121 outside high accuracy filter screen 301, be discharged in the atmospheric pressure by hydraulic control valve 113 again, realize outside strong flushing high accuracy filter screen 301 simultaneously, inner powerful sludge, blowdown process; Carrying out along with soil pick-up, blowdown, high accuracy filter screen 301 inside and outside differential pressures progressively reduce, when high accuracy filter screen 301 inside and outside differential pressures reach in the preset threshold, electric cabinet 106 output control signals are in order to stop the corresponding actions of reductor 102 and dirt sucking device 203, electric cabinet 106 output control signals are in order to close high-pressure pump 107 and hydraulic control valve 113 simultaneously, high pressure kinetic energy that this high-pressure pump 107 produces stream stops thereupon, repeats above-mentioned action when pressure reduction increases to aforesaid threshold values next time again.The utility model carries out comprehensive cleaning by suction nozzle 206 and 209 pairs of high accuracy filter screen 301 surfaces externally and internallies of high pressure nozzle, only consumes the seldom water of part in cleaning process, and water system is work as usual, can not influence the normal filtration work of filter.
The vertical self-cleaning strainer of the utility model embodiment also is provided with manual backwash, pressure reduction automatic back-washing and three kinds of patterns of timing automatic backwash.High-pressure pump 107 is controlled by control cabinet 106, can realize three kinds of cleaning models by " backwash of hand fortune ", " pressure reduction automatic back-washing " and " timing automatic backwash " button of pressing on the filter.Wherein, the backwash of hand fortune refers to: press soil pick-up, blowdown process and the certain hour of working that " backwash of hand fortune " button can start the vertical self-cleaning strainer of the utility model, the concrete time can preestablish according to different demands; The pressure reduction automatic back-washing refers to: along with the prolongation of filtration time, in the high accuracy filter screen 301 interception water behind the impurity such as suspension, can be in the inside and outside formation pressure reduction of high accuracy filter screen 301 and increase gradually, when pressure difference reaches setting value, pressure test device 122 output signals, control appliance will start backwash procedure automatically; Timing automatic backwash refers to: equipment has been set the regularly backwash time when dispatching from the factory, do not need the user to adjust usually, if pressure reduction forms earlier in the time of setting, then starts pressure reduction automatic back-washing program earlier.
The vertical self-cleaning strainer of the utility model embodiment is located at dirt sucking device in the high accuracy filter screen by the high accuracy filter screen is located in the filter chamber, realizes automatic fitration under comparatively complicated water quality environment; And at the inside and outside wall of high accuracy filter screen corresponding sewage suction device and high pressure nozzle are set respectively, surfaces externally and internally to the high accuracy filter screen carries out comprehensive cleaning simultaneously, suction nozzle suction inadequately can't the complete self-cleaning problem that influences filtering function when the water system hypotony to have solved existing filtration system, thereby guarantees the self-cleaning stability of filtration system; Vertical self-cleaning strainer among the utility model embodiment only consumes the seldom water of part in cleaning process, water system is work as usual, can not influence the normal filtration work of filter.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (1)
1. vertical self-cleaning strainer, comprise water inlet, delivery port, high pressure chest, filter chamber and intake antrum, it is characterized in that, described water inlet and high pressure chest are located at an end of filter respectively, described delivery port is located at a side of filter, described filter chamber is located at filter interior, and described intake antrum is located at the upper end of water inlet and is separated with filter chamber; Described filter also comprises dirt sucking device and high accuracy filter screen, and described high accuracy filter screen is located in the filter chamber, and described dirt sucking device is located in the high accuracy filter screen, and a side of described dirt sucking device is arranged the sewage suction device of some.
2. vertical self-cleaning strainer according to claim 1, it is characterized in that, described filter also comprises electric cabinet, pressure test device, reductor, high-pressure pump, blow-off pipe and hydraulic control valve, described electric cabinet is located on the filter housings, described pressure test device is located at a side of electric cabinet, described reductor is located at the outside of filter, described high-pressure pump is fixed in a side of filter housings by the high-pressure pump base and is connected with electric cabinet by pressure test device, described high-pressure pump water side is connected with high pressure chest by high-voltage tube, described high-pressure pump water inlet end is connected with filter chamber by the high pressure raw water tubes, described blow-off pipe is located in the intake antrum, one end of described blow-off pipe extends to outside the intake antrum and is connected with hydraulic control valve, the other end links to each other with dirt sucking device indirectly by the dirt sucking device adapter sleeve, and described hydraulic control valve is located at a side of filter housings and is linked to each other indirectly with dirt sucking device by blow-off pipe.
3. vertical self-cleaning strainer according to claim 1 and 2, it is characterized in that, described filter also comprises deceleration arbor, tube connector, tube connector axle sleeve and high pressure skirt, described deceleration arbor is connected with reductor, described tube connector is located in the high pressure chest, the upper end of described tube connector is connected with the deceleration arbor, and the lower end of described tube connector extends to filter chamber by end casing and is connected with dirt sucking device by the tube connector axle sleeve, has the high pressure hand-hole of some on the described tube connector; Described high pressure skirt is doorframe structure, extends downwardly into certain altitude along the high accuracy filter screen outside, and described tube connector axle sleeve is fixing high pressure skirt in opposite directions.
4. vertical self-cleaning strainer according to claim 3, it is characterized in that, described filter also comprises dividing plate flange, dirt sucking device adapter sleeve, adapter sleeve bracing frame, filter screen mounting flange and filter screen end caps, described dividing plate flange is used for separating intake antrum and filter chamber, described dirt sucking device adapter sleeve is fixed on the dividing plate flange by the adapter sleeve bracing frame, the described filter screen end caps of an end that described filter screen mounting flange is located at the high accuracy filter screen is located at the other end of high accuracy filter screen, and described high accuracy filter screen is fixed on the dividing plate flange by the filter screen mounting flange.
5. vertical self-cleaning strainer according to claim 3, it is characterized in that, the sewage suction device of described dirt sucking device one side becomes T word shape assembled arrangement by the suction nozzle support bar with suction nozzle, suction nozzle is the flat structure of hollow, the length summation of suction nozzle equals the effective length of high accuracy filter screen, and the gap between suction nozzle and the high accuracy filter screen inboard is below the 2mm; Described sewage suction device is located at the outside of dirt sucking device.
6. vertical self-cleaning strainer according to claim 5, it is characterized in that, one side of described high pressure skirt is arranged the high pressure nozzle of some according to group, and described high pressure nozzle is located at the inboard and corresponding with the position of suction nozzle of high pressure skirt and is arranged on the inside and outside wall of high accuracy filter screen in opposite directions.
7. according to claim 1 or the described vertical self-cleaning strainer of 2 each claims, it is characterized in that, described water inlet is downward axis Installation Modes and be located at the bottom of filter straight down, and described high pressure chest, filter chamber, intake antrum and high accuracy filter screen are tubular structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220671540 CN203043684U (en) | 2012-12-09 | 2012-12-09 | Vertical self-cleaning filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220671540 CN203043684U (en) | 2012-12-09 | 2012-12-09 | Vertical self-cleaning filter |
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| Publication Number | Publication Date |
|---|---|
| CN203043684U true CN203043684U (en) | 2013-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220671540 Expired - Fee Related CN203043684U (en) | 2012-12-09 | 2012-12-09 | Vertical self-cleaning filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203043684U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102940986A (en) * | 2012-12-09 | 2013-02-27 | 深圳市福尔沃机电设备有限公司 | Vertical self-cleaning filter and self-cleaning method |
| CN105771369A (en) * | 2016-05-13 | 2016-07-20 | 青岛海德威科技有限公司 | Low-back-pressure full automatic back flushing suction multi-tube filter |
| CN109465218A (en) * | 2018-09-29 | 2019-03-15 | 嘉善县实验中学 | A kind of cleaning device |
| CN111085026A (en) * | 2019-12-31 | 2020-05-01 | 厦门三登塑胶工业有限公司 | Double union filter |
-
2012
- 2012-12-09 CN CN 201220671540 patent/CN203043684U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102940986A (en) * | 2012-12-09 | 2013-02-27 | 深圳市福尔沃机电设备有限公司 | Vertical self-cleaning filter and self-cleaning method |
| CN102940986B (en) * | 2012-12-09 | 2015-01-07 | 深圳市福尔沃机电设备有限公司 | Vertical self-cleaning filter and self-cleaning method |
| CN105771369A (en) * | 2016-05-13 | 2016-07-20 | 青岛海德威科技有限公司 | Low-back-pressure full automatic back flushing suction multi-tube filter |
| CN105771369B (en) * | 2016-05-13 | 2018-08-07 | 青岛海德威科技有限公司 | Low back pressure Full-automatic reverse suctions more filters |
| CN109465218A (en) * | 2018-09-29 | 2019-03-15 | 嘉善县实验中学 | A kind of cleaning device |
| CN111085026A (en) * | 2019-12-31 | 2020-05-01 | 厦门三登塑胶工业有限公司 | Double union filter |
| CN111085026B (en) * | 2019-12-31 | 2023-09-01 | 厦门三登塑胶工业有限公司 | Double-union filter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20181209 |
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| CF01 | Termination of patent right due to non-payment of annual fee |