CN210698959U - Full-automatic back-washing shallow medium filter - Google Patents
Full-automatic back-washing shallow medium filter Download PDFInfo
- Publication number
- CN210698959U CN210698959U CN201921603026.XU CN201921603026U CN210698959U CN 210698959 U CN210698959 U CN 210698959U CN 201921603026 U CN201921603026 U CN 201921603026U CN 210698959 U CN210698959 U CN 210698959U
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- filter
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- water
- control valve
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- 238000011001 backwashing Methods 0.000 title description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 238000005406 washing Methods 0.000 claims abstract description 31
- 239000007921 spray Substances 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims description 26
- 239000004576 sand Substances 0.000 claims description 15
- 239000010865 sewage Substances 0.000 claims description 10
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 15
- 238000001914 filtration Methods 0.000 description 13
- 238000005201 scrubbing Methods 0.000 description 8
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
The utility model discloses a full-automatic back flush shallow layer medium filter, belong to filter equipment technical field, which comprises a tank body, the inlet tube, the water distribution dish, the filter medium layer, receive water and strain cap and outlet pipe, still include exhaust assembly, washing liquid spray tube and blow off pipe, the top and the bottom of the jar body communicate inlet tube and outlet pipe respectively, the water distribution dish sets up the inner bottom at the inlet tube, the below of water distribution dish sets up the filter medium layer, a plurality of water of receiving are buried underground to the bottom of filter medium layer and are strained the cap, the below of receiving the water and strain the cap sets up exhaust assembly and washing liquid spray tube, exhaust joint pipe setting of exhaust assembly is on the wall of the jar body and communicates the air source, the washing liquid spray tube is visited the wall of the jar body and is communicated washing liquid supply unit, the blow off pipe sets up. The utility model discloses full-automatic back flush shallow media filter can be comparatively thorough get rid of the stronger dirt of adhesive force in the filter layer medium, improves shallow media filter's filter effect.
Description
Technical Field
The utility model relates to a filter equipment technical field especially relates to a full-automatic back flush shallow medium filter.
Background
The shallow medium filter consists of several standard high speed sand tank units and is one kind of efficient filtering apparatus with filtering medium to eliminate suspended matter, microbe and other fine grains in water and to reduce water turbidity and purify water. The common filter materials comprise quartz sand, activated carbon, anthracite, manganese sand and the like. The method is widely applied to various industries such as agricultural irrigation, chemical industry, petroleum, metallurgy, industrial and mining and the like.
The back flush process is generally that, as impurities are continuously accumulated in the packing layer, the loss of the internal pressure head is continuously increased. When the loss of the water inlet pressure head and the water outlet pressure head reaches a set value, the system starts an automatic flushing valve to enable one standard sand tank to be switched to a backwashing state, other standard unit sand tanks in the system are still filtered, the filtered clean water is used for backwashing the standard unit sand tanks, and the rest of the clean water is still sent to a user; the backwashing sewage is discharged through a backwashing sewage discharge pipe of the automatic valve. And after the backwashing is finished, the pressure head loss in the standard unit sand tank is reduced to a reasonable range, the unit sand tank is recovered to a filtering state, the next standard unit sand tank enters a backwashing state, all the sand tanks are cleaned in sequence, and the system is recovered to the filtering state.
A shallow medium filter adopted in raw water filtration often gathers a large amount of dirt with strong adhesive force, such as organic impurities, bacteria, microorganisms and the like in a filter layer medium, and the dirt cannot be removed completely by simply using clean water in a backwashing process, so that the filtering effect of the shallow medium filter is influenced.
Therefore, it is necessary to develop a new fully automatic backwashing shallow media filter for the above disadvantages.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a full-automatic back flush shallow media filter, the stronger dirt of adhesive force in getting rid of the filter layer medium that can be comparatively thorough improves shallow media filter's filter effect.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model relates to a full-automatic back-washing shallow medium filter, which comprises a tank body, a water inlet pipe, a water distribution disc, a filter medium layer, a water receiving filter cap, an outlet pipe, an exhaust component, a washing liquid spray pipe and a blow-off pipe, the top and the bottom of the tank body are respectively communicated with the water inlet pipe and the outlet pipe, the water distribution disc is arranged at the bottom of the inner end of the water inlet pipe, the filtering medium layer is arranged below the water distribution disc, a plurality of water collecting filtering caps are embedded at the bottom of the filtering medium layer, the lower part of the water receiving filter cap is provided with the exhaust component and the cleaning solution spray pipe, an exhaust joint pipe of the exhaust component is arranged on the wall of the tank body and communicated with a clean air source, the cleaning solution spray pipe extends out of the wall of the tank body and is communicated with the cleaning solution supply unit, and the drain pipe is arranged on the side wall of the tank body and is positioned above the filter medium layer.
Furthermore, the exhaust assembly further comprises a first one-way valve and a second electric control valve, the exhaust joint pipe is sequentially connected with the first one-way valve and the second electric control valve through an air pipe, and the other end of the second electric control valve is communicated with the clean air source.
Further, the exhaust subassembly is in the internal bubble generator that is provided with of jar, bubble generator includes the criss-cross pipe, a plurality of bubble shower nozzles are installed to the pipe top, bubble generator passes through the extension board and installs on the diapire inboard of the jar body.
Furthermore, the outer end of the cleaning solution spray pipe is sequentially connected with a second one-way valve and a third electric control valve through a pipeline, and the other end of the third electric control valve is communicated with the cleaning solution supply unit.
Furthermore, the outside of blow off pipe has the fourth electric control valve through the pipe connection, the outside of inlet tube has first electric control valve through the pipe connection.
Further, the top of the tank body is also provided with a breathing tube, and the outer side of the breathing tube is connected with a fifth electric control valve through a pipeline.
Further, the filter medium layer is filled with natural sea sand filter materials.
Compared with the prior art, the utility model discloses a beneficial technological effect:
the utility model relates to a full-automatic back-washing shallow medium filter, which is arranged in the tank body of the existing shallow medium filter through an exhaust component and a washing liquid spray pipe, when back washing is carried out, a washing liquid supply unit sprays washing liquid to the tank body through the washing liquid spray pipe, and back washing cleaning water introduced by an outlet pipe drives the tank body to move upwards; the clean air source conveys fine bubbles into the tank body through the exhaust assembly, and the fine bubbles move from bottom to top and are matched with the washing liquid vapor to scrub the filter medium of the filter medium layer. The method has the advantages that the steam and water are scrubbed for a period of time, dirt with strong adhesive force in the filter medium can be thoroughly removed, and the cleaned sewage is discharged through the sewage discharge pipe.
In addition, the adopted natural sea sand filter material has round particles, high strength, difficult damage, no powder, high density, high mechanical strength, strong dirt intercepting capability, easy back flushing, long service cycle and good chemical property stability, and is not easily influenced by the washing liquid. Through the setting of first check valve and second automatically controlled valve, can avoid the utility model discloses full-automatic back flush shallow media filter prevents that the water is reverse to get into at normal during operation clean air source is convenient for control second automatically controlled valve supply compressed clean air when needing the back flush. Through the arrangement of the bubble generator, uniform and dense fine bubbles are convenient to generate, the surface area of the fine bubbles is larger, and thorough and sufficient steam-water scrubbing is convenient to carry out. Through the setting of second check valve and third automatically controlled valve, can avoid the utility model discloses full-automatic back flush shallow medium filter prevents that the water is reverse to get into at normal during operation washing liquid supply unit is convenient for control third automatically controlled valve supply washing liquid when needing the back flush.
Drawings
The present invention will be further explained with reference to the following description of the drawings.
FIG. 1 is a schematic diagram of the filtering state structure of the fully automatic backwashing shallow medium filter of the present invention;
FIG. 2 is a schematic structural view of a back-washing state of the fully automatic back-washing shallow medium filter of the present invention;
FIG. 3 is a schematic view of the control principle of the fully automatic backwashing shallow medium filter of the present invention;
description of reference numerals: 1. a tank body; 2. a water inlet pipe; 201. a first electrically controlled valve; 3. a water distribution plate; 4. a filter medium layer; 5. a water collecting filter cap; 6. an outlet pipe; 7. an exhaust assembly; 701. an exhaust joint pipe; 702. a first check valve; 703. a second electrically controlled valve; 8. a cleaning solution spray pipe; 801 a second one-way valve; 802. a third electrically controlled valve; 9. a blow-off pipe; 901. a fourth electrically controlled valve; 10. a manhole; 11. a differential pressure sensor; 12. a breathing tube; 1201. a fifth electrically controlled valve; 13. and a controller.
Detailed Description
The core of the utility model is to provide a full-automatic back flush shallow media filter, the strong dirt of adhesive force in getting rid of the filter layer medium that can be comparatively thorough improves shallow media filter's filter effect.
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Description of the drawings in the following detailed description, the upper, lower, left and right descriptions are for illustrative purposes only and should not be construed as limiting the invention.
Referring to the attached drawings, fig. 1 is a schematic structural diagram of a filtering state of a full-automatic backwashing shallow medium filter of the utility model; FIG. 2 is a schematic structural view of a back-washing state of the fully automatic back-washing shallow medium filter of the present invention; fig. 3 is a schematic diagram of the control principle of the full-automatic backwashing shallow medium filter of the utility model.
In a specific embodiment of the present invention, as shown in fig. 1 and 2, a fully automatic back-washing shallow medium filter includes a tank 1, a water inlet pipe 2, a water distribution plate 3, a filter medium layer 4, a water receiving filter cap 5 and an outlet pipe 6, and further includes an exhaust assembly 7, a washing liquid spray pipe 8 and a blow-off pipe 9, the top and the bottom of the tank 1 are respectively communicated with the water inlet pipe 2 and the outlet pipe 6, the water distribution plate 3 is installed at the bottom of the inner end of the water inlet pipe 2, the filter medium layer 4 is installed below the water distribution plate 3, the water receiving filter caps 5 are embedded on a bottom bracket of the filter medium layer 4, the exhaust assembly 7 and the washing liquid spray pipe 8 are installed below the water receiving filter cap 5, an exhaust joint pipe 701 of the exhaust assembly 7 is welded on the wall of the tank 1 and communicated with a clean air source, which may be an air tank of an; the cleaning solution spray pipe 8 extends out of the wall of the tank body 1 and is communicated with a cleaning solution supply unit, and the cleaning solution supply unit is a cleaning solution pump arranged in a cleaning solution storage box; the blow-off pipe 9 is welded on the side wall of the tank body 1 and is positioned above the filter medium layer 4.
The cleaning solution supply unit is arranged in the tank body 1 of the conventional shallow medium filter through the exhaust assembly 7 and the cleaning solution spray pipe 8, and when backwashing is carried out, the cleaning solution supply unit sprays cleaning solution to the tank body 1 through the cleaning solution spray pipe 8 and is driven by backwashing cleaning water introduced by the outlet pipe 6 to run upwards; the clean air source conveys fine bubbles into the tank body 1 through the exhaust assembly 7 to move from bottom to top, and the fine bubbles are matched with the filter medium of the washing liquid vapor scrubbing filter medium layer 4. Through the steam-water scrubbing for a period of time, dirt with strong adhesive force in the filter medium can be thoroughly removed, and the cleaned sewage is discharged through the drain pipe 9.
Specifically, the filter medium layer 4 is filled with a natural sea sand filter material. The adopted natural sea sand filter material has round particles, high strength, difficult damage, no powder, high density, high mechanical strength, strong dirt intercepting capability, easy back flushing, long service cycle, good chemical property stability and difficult influence of the washing liquid.
In a specific embodiment of the present invention, as shown in fig. 1 and fig. 2, the exhaust assembly 7 further includes a first check valve 702 and a second electric control valve 703, the exhaust joint pipe 701 sequentially connects the first check valve 702 and the second electric control valve 703 through an air pipe, and the other end of the second electric control valve 703 is communicated to the clean air source.
Through the setting of first check valve 702 and second automatically controlled valve 703, can avoid the utility model discloses full-automatic back flush shallow medium filter prevents that the water is reverse to get into at normal during operation clean air source is convenient for control second automatically controlled valve 703 supply compressed clean air when needing the back flush.
Particularly, exhaust subassembly 7 is provided with bubble generator in jar 1, and bubble generator includes the pipe of cross intercommunication, and a plurality of bubble shower nozzles are installed to the pipe top, and bubble generator passes through the extension board to be installed on jar body 1's diapire inboard.
Through the arrangement of the bubble generator, uniform and dense fine bubbles are convenient to generate, the surface area of the fine bubbles is larger, and thorough and sufficient steam-water scrubbing is convenient to carry out.
In a specific embodiment of the present invention, as shown in fig. 1 and fig. 2, the outer end of the washing liquid spraying pipe 8 is sequentially connected to the second check valve 801 and the third electric control valve 802 through a pipeline, and the other end of the third electric control valve 802 is connected to the washing liquid supply unit.
Through the setting of second check valve 801 and third automatically controlled valve 802, can avoid the utility model discloses full-automatic back flush shallow medium filter prevents that the water is reverse to get into at normal during operation washing liquid supply unit is convenient for control third automatically controlled valve 802 supply washing liquid when needing the back flush.
In a specific embodiment of the present invention, as shown in fig. 1 to 3, the outside of the drainage pipe 9 is connected to the fourth electric control valve 901 through a pipe, and the outside of the water inlet pipe 2 is connected to the first electric control valve 201 through a pipe. Further, a breathing tube 12 is welded to the top of the tank body 1, and a fifth electric control valve 1201 is connected to the outer side of the breathing tube 12 through a pipeline. Further, a pressure difference sensor 11 is arranged on the side wall of the tank body 1, and the pressure difference sensor 11 is used for detecting the pressure difference of the water body of the water inlet pipe 2 and the water body of the water outlet pipe 6. The above differential pressure sensor 11, the first electric control valve 201, the second electric control valve 703, the third electric control valve 802, the fourth electric control valve 901 and the fifth electric control valve 1201 are all electrically connected to the utility model discloses full-automatic back flush shallow medium filter's controller 13 to by the operation of controller 13 control.
During normal filtering operation, the controller 13 controls the second electronic control valve 703, the third electronic control valve 802, the fourth electronic control valve 901 and the fifth electronic control valve 1201 to close, and the first electronic control valve 201 to open. Raw water enters the tank body 1 from the water inlet pipe 2 and is output through the water distribution disc 3, the filter medium layer 4, the water receiving filter cap 5 and the outlet pipe 6 in sequence.
When backwashing is needed, the differential pressure sensor 11 feeds a differential pressure signal back to the controller 13, the controller 13 judges that the differential pressure exceeds a set value range, the first electric control valve 201 and the fourth electric control valve 901 are controlled to be closed, and the second electric control valve 703, the third electric control valve 802 and the fifth electric control valve 1201 are all opened. Backwash cleaning water provided by other filters enters the tank body 1 through the outlet pipe 6; the cleaning solution supply unit supplies cleaning solution through the third electric control valve 802, the clean air source supplies compressed clean air through the second electric control valve 703 and sprays the compressed clean air from the bubble generator to form uniform and dense fine bubbles, so that the filter medium of the filter medium layer 4 is fully and thoroughly scrubbed by steam and water, and the breathing tube 12 and the fifth electric control valve 1201 play a role in balancing air pressure. After the steam-water scrubbing reaches the set time, the controller 13 controls the first electric control valve 201, the second electric control valve 703, the third electric control valve 802 and the fifth electric control valve 1201 to be closed, the fourth electric control valve 901 is opened, and sewage formed by backwashing is discharged through the sewage discharge pipe 9 and the fourth electric control valve 901. After the sewage is discharged completely, the utility model discloses full-automatic back flush shallow dielectric filter enters into normal filtration state.
The utility model discloses full-automatic back flush shallow medium filter sets up in the jar body 1 of current shallow medium filter through exhaust subassembly 7 and washing liquid spray tube 8, and when carrying out the back flush, washing liquid supply unit sprays washing liquid to jar body 1 through washing liquid spray tube 8 to back flush cleaning water drive that is introduced by outlet pipe 6 moves upwards; the clean air source conveys fine bubbles into the tank body 1 through the exhaust assembly 7 to move from bottom to top, and the fine bubbles are matched with the filter medium of the washing liquid vapor scrubbing filter medium layer 4. Through the steam-water scrubbing for a period of time, dirt with strong adhesive force in the filter medium can be thoroughly removed, and the cleaned sewage is discharged through the drain pipe 9. In addition, the adopted natural sea sand filter material has round particles, high strength, difficult damage, no powder, high density, high mechanical strength, strong dirt intercepting capability, easy back flushing, long service cycle and good chemical property stability, and is not easily influenced by the washing liquid. Through the setting of first check valve 702 and second automatically controlled valve 703, can avoid the utility model discloses full-automatic back flush shallow medium filter prevents that the water is reverse to get into at normal during operation clean air source is convenient for control second automatically controlled valve 703 supply compressed clean air when needing the back flush. Through the arrangement of the bubble generator, uniform and dense fine bubbles are convenient to generate, the surface area of the fine bubbles is larger, and thorough and sufficient steam-water scrubbing is convenient to carry out. Through the setting of second check valve 801 and third automatically controlled valve 802, can avoid the utility model discloses full-automatic back flush shallow medium filter prevents that the water is reverse to get into at normal during operation washing liquid supply unit is convenient for control third automatically controlled valve 802 supply washing liquid when needing the back flush.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (7)
1. The utility model provides a full-automatic back flush shallow layer medium filter, includes jar body (1), inlet tube (2), water distribution dish (3), filter medium layer (4), receives water and strains cap (5) and outlet pipe (6), its characterized in that: also comprises an exhaust component (7), a cleaning solution spray pipe (8) and a drain pipe (9), the top and the bottom of the tank body (1) are respectively communicated with the water inlet pipe (2) and the outlet pipe (6), the water distribution plate (3) is arranged at the bottom of the inner end of the water inlet pipe (2), the filter medium layer (4) is arranged below the water distribution plate (3), a plurality of water collecting filter caps (5) are embedded at the bottom of the filter medium layer (4), the exhaust component (7) and the cleaning solution spray pipe (8) are arranged below the water receiving filter cap (5), an exhaust joint pipe (701) of the exhaust component (7) is arranged on the wall of the tank body (1) and is communicated with a clean air source, the cleaning solution spray pipe (8) extends out of the wall of the tank body (1) and is communicated with a cleaning solution supply unit, the sewage discharge pipe (9) is arranged on the side wall of the tank body (1) and is positioned above the filter medium layer (4).
2. The fully automatic backwash shallow media filter as defined in claim 1 wherein: the exhaust assembly (7) further comprises a first one-way valve (702) and a second electric control valve (703), the exhaust joint pipe (701) is sequentially connected with the first one-way valve (702) and the second electric control valve (703) through an air pipe, and the other end of the second electric control valve (703) is communicated with the clean air source.
3. The fully automatic backwash shallow media filter as defined in claim 2 wherein: the air exhaust assembly (7) is characterized in that a bubble generator is arranged in the tank body (1) and comprises a cross-shaped round pipe, a plurality of bubble nozzles are installed at the top of the round pipe, and the bubble generator is installed on the inner side of the bottom wall of the tank body (1) through a support plate.
4. The fully automatic backwash shallow media filter as defined in claim 1 wherein: the outer end of the washing liquid spray pipe (8) is sequentially connected with a second one-way valve (801) and a third electric control valve (802) through pipelines, and the other end of the third electric control valve (802) is communicated with the washing liquid supply unit.
5. The fully automatic backwash shallow media filter as defined in claim 1 wherein: the outside of blow off pipe (9) has fourth electric control valve (901) through the pipe connection, the outside of inlet tube (2) has first electric control valve (201) through the pipe connection.
6. The fully automatic backwash shallow media filter as defined in claim 5 wherein: the top of the tank body (1) is also provided with a breathing tube (12), and the outer side of the breathing tube (12) is connected with a fifth electric control valve (1201) through a pipeline.
7. The fully automatic backwash shallow media filter as defined in claim 1 wherein: the filter medium layer (4) is filled with natural sea sand filter materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921603026.XU CN210698959U (en) | 2019-09-25 | 2019-09-25 | Full-automatic back-washing shallow medium filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921603026.XU CN210698959U (en) | 2019-09-25 | 2019-09-25 | Full-automatic back-washing shallow medium filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210698959U true CN210698959U (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921603026.XU Expired - Fee Related CN210698959U (en) | 2019-09-25 | 2019-09-25 | Full-automatic back-washing shallow medium filter |
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| Country | Link |
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| CN (1) | CN210698959U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116078006A (en) * | 2023-02-28 | 2023-05-09 | 浙江华亨实业有限公司 | Mechanical filter based on constant pressure technology |
-
2019
- 2019-09-25 CN CN201921603026.XU patent/CN210698959U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116078006A (en) * | 2023-02-28 | 2023-05-09 | 浙江华亨实业有限公司 | Mechanical filter based on constant pressure technology |
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Granted publication date: 20200609 |