CN210448765U - Off-line cleaning device for membrane module device - Google Patents

Off-line cleaning device for membrane module device Download PDF

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Publication number
CN210448765U
CN210448765U CN201921030723.0U CN201921030723U CN210448765U CN 210448765 U CN210448765 U CN 210448765U CN 201921030723 U CN201921030723 U CN 201921030723U CN 210448765 U CN210448765 U CN 210448765U
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China
Prior art keywords
hole
wall
positioning column
sleeve
water tank
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Expired - Fee Related
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CN201921030723.0U
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Chinese (zh)
Inventor
乔瑞龙
王俐俐
陈涛
丁鹏程
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Inner Mongolia S'water Environmental Protection Technology Co ltd
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Inner Mongolia S'water Environmental Protection Technology Co ltd
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Priority to CN201921030723.0U priority Critical patent/CN210448765U/en
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Abstract

The utility model belongs to the technical field of effluent treatment plant technique and specifically relates to a membrane module ware off-line belt cleaning device. The ultrasonic cleaning device comprises a cleaning water tank, an isolation screen and a plurality of adjustable ultrasonic transducers which are embedded at the side of a bottom plate of the cleaning water tank and are distributed in a rectangular ring shape; the adjustable ultrasonic transducer comprises an assembly cavity shell, a buffer through hole, a positioning column sleeve penetrating through the buffer through hole and distributed, a transducer arranged in the top end part of the positioning column sleeve and exposed out of the inner wall of the bottom plate of the cleaning water tank and distributed, a corrugated lantern ring sleeved on the positioning column sleeve and a swing driver connected with the positioning column sleeve to drive the positioning column sleeve to swing. The utility model discloses utilize the drive effect of swing driver to the reference column cover, make its swing motion that can drive the transducer in step and make certain angle for the washing pond to reach the purpose that changes sound wave propagation direction, make the sound wave can tend to the space direction at membrane group ware place better, and then accelerate the cleaning efficiency to membrane group ware.

Description

Off-line cleaning device for membrane module device
Technical Field
The utility model belongs to the technical field of effluent treatment plant technique and specifically relates to a membrane module ware off-line belt cleaning device.
Background
The membrane bioreactor (MBR, also called as membrane group device or membrane component) is an organic combination of membrane separation technology and biotechnology, and mainly utilizes ultrafiltration or microfiltration membrane separation technology to replace a secondary sedimentation tank and a conventional filtration unit in the traditional activated sludge process, so that hydraulic retention time and sludge age are completely separated, and high-efficiency solid-liquid separation capability is achieved. In the practical application process, once membranes used for microfiltration or ultrafiltration membranes and the like are polluted, transmembrane resistance is increased, membrane flux is reduced, and the problems of influence on the service performance, service life and the like of the membranes are easily caused. Thus, periodic cleaning of the microfiltration or ultrafiltration membranes has a critical impact on the membrane module.
At present, off-line chemical cleaning is a cleaning method for membrane modules widely used in the industry, and the existing off-line cleaning device mainly comprises a container filled with cleaning agents such as sodium hypochlorite or citric acid, and the membrane modules are kept still in the cleaning agents for soaking for a period of time so as to remove pollutants on the surface and inside of the membrane by utilizing the chemical action of the cleaning agents and recover the water permeability of the membrane. Because the membrane module device needs to be kept still for a long time for soaking, the off-line cleaning device has extremely low cleaning efficiency and relatively high cleaning cost, and the cleaning process is greatly influenced by the environmental temperature, for example, the membrane module device cannot achieve the expected cleaning effect when being cleaned in an environment with low water temperature in winter.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art existence, the utility model aims to provide a membrane group ware off-line belt cleaning device.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an off-line cleaning device for a membrane module device comprises a cleaning water tank filled with cleaning agents and an isolation screen which is arranged in the cleaning water tank and used for immersing the membrane module device in the cleaning agents; the ultrasonic cleaning device also comprises a plurality of adjustable ultrasonic transducers which are embedded at the side of the bottom plate of the cleaning water tank and are distributed in a rectangular ring shape;
the adjustable ultrasonic transducer comprises an assembly cavity shell hung on the outer wall of a bottom plate of the cleaning water tank, a buffer through hole arranged on the bottom plate of the cleaning water tank, a positioning column sleeve penetrating through the buffer through hole and distributed, a transducer installed in the top end part of the positioning column sleeve and exposed on the inner wall of the bottom plate of the cleaning water tank, a corrugated lantern ring sleeved on the positioning column sleeve and used for plugging a gap between the outer peripheral wall of the positioning column sleeve and the hole wall of the buffer through hole, and a swing driver installed in the assembly cavity shell and connected with the positioning column sleeve to drive the positioning column sleeve to swing relative to the buffer through hole.
Preferably, it still includes that a plurality of inlays the fixed ultrasonic transducer who is rectangular array distribution in the bottom plate central zone of dress in the wash basin and each other, fixed ultrasonic transducer runs through the sandwich piezoelectric transducer who offers the positioning ring groove on the perisporium of positioning hole distribution and front end portion and the location seal cover that the perisporium of front end portion gomphosis in the positioning ring groove and front end portion's periphery wall and positioning hole's pore wall offseted including locating hole, front end portion on the bottom plate of wash basin.
Preferably, the inner wall of the side plate of the cleaning water tank is an arc surface, and the thickness of the side plate of the cleaning water tank is gradually decreased from top to bottom.
Preferably, the inner wall of the side plate of the cleaning water tank is further provided with a plurality of reflection convex rings which are sequentially distributed from top to bottom.
Preferably, the washing device further comprises a plurality of elastic supporting legs arranged on the outer wall of the bottom plate of the washing pool, wherein each elastic supporting leg comprises a socle sleeve seat with a coaxial sleeve hole, a fixed column, a plurality of buffering balls and a return spring, the top end of each buffering ball is fixed on the outer wall of the bottom plate of the washing pool, the bottom end of each fixing column is inserted and sleeved in the corresponding sleeve hole, the buffering balls are circumferentially embedded on the bottom end peripheral wall of the corresponding fixed column and are in contact with the hole wall of the coaxial sleeve hole, the top end of each return spring is connected with the bottom end face of the corresponding fixed column.
Preferably, the fixing column comprises a main body column and a limiting column, wherein the top end of the main body column is fixed on the outer wall of the bottom plate of the cleaning water tank, the limiting column is arranged on the end face of the bottom end of the main body column and is positioned in the same shaft sleeve hole, the outer diameter of the limiting column is larger than the inner diameter of a port of the coaxial sleeve hole, and the inner diameter of the port of the coaxial sleeve hole is larger than the outer diameter of; and the buffering balls are circumferentially and uniformly embedded on the circumferential wall of the limiting column.
Preferably, the swing driver comprises a power shaft distributed in the radial direction parallel to the buffer through hole, an eccentric balance wheel coaxially arranged on the power shaft and abutted against the peripheral wall of the bottom end of the positioning column sleeve, a tension spring with one end connected with the inner wall of the assembly cavity shell and the other end connected with the peripheral wall of the middle part of the positioning column sleeve, a compression spring with one end connected with the hole wall of the buffer through hole and the other end connected with the peripheral wall of the top end of the positioning column sleeve, and a shaft rotating support arm with one end fixed on the inner wall of the assembly cavity shell and the other end in shaft rotating connection with the peripheral wall of the positioning column sleeve; relative to the positioning column sleeve, the compression spring, the shaft rotation supporting arm, the extension spring and the eccentric balance wheel are sequentially distributed on the same side of the positioning column sleeve from top to bottom.
Preferably, the ultrasonic wave generator further comprises four power motors, wherein each power motor corresponds to a plurality of adjustable ultrasonic transducers distributed in rows or columns; and the power shafts of the adjustable ultrasonic transducers are distributed in rows or columns and are coaxially and sequentially connected in series to form a power main shaft, and the power main shaft is connected with a corresponding power motor.
Preferably, the ultrasonic transducer further comprises a power motor, wherein a plurality of power shafts of the adjustable ultrasonic transducers which are distributed in rows or columns are coaxially and sequentially connected in series to form a power main shaft, two ends of each power main shaft are provided with a bevel gear, and two adjacent bevel gears are in meshing transmission connection; the power motor is connected with one of the power main shafts.
Due to the adoption of the scheme, the utility model discloses utilize the drive effect of swing driver to the locating column cover, make it can drive the transducer in step and make certain angle swing motion relative to the washing pond to reach the purpose that changes the sound wave propagation direction, make the sound wave can tend to the space direction that the membrane group ware is located better, and then accelerate the cleaning efficiency to the membrane group ware; the cleaning machine has the advantages of simple and compact structure, high cleaning efficiency, and very high practical value and market popularization value.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of an adjustable ultrasonic transducer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the operation principle of the adjustable ultrasonic transducer according to the embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of a fixed ultrasonic transducer according to an embodiment of the present invention;
fig. 5 is an exploded view of the elastic leg according to the embodiment of the present invention;
fig. 6 is a schematic cross-sectional structure view of an elastic leg according to an embodiment of the present invention;
FIG. 7 is a schematic view of the power source configuration according to an embodiment of the present invention;
fig. 8 is a schematic structural distribution diagram of a power source according to another embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1 to 8, the off-line cleaning device for membrane modules provided in this embodiment comprises a cleaning basin 10 containing a cleaning agent such as sodium hypochlorite or citric acid, an isolation screen 20 disposed in the cleaning basin 10 for soaking the membrane modules (not shown in the figure, i.e., MBR membrane modules) in the cleaning agent, and a plurality of adjustable ultrasonic transducers 30 embedded at the side of the bottom plate of the cleaning basin 10 and distributed in a rectangular ring shape; the adjustable ultrasonic transducer 30 includes an assembly cavity housing 31 suspended on an outer wall of a bottom plate of the cleaning water tank 10, a buffer through hole (not labeled in the figure) opened on the bottom plate of the cleaning water tank 10, a positioning column sleeve 32 penetrating the buffer through hole for distribution, a transducer 33 installed in a top end portion of the positioning column sleeve 32 and exposed on an inner wall of the bottom plate of the cleaning water tank 10 for distribution, a corrugated sleeve ring 34 sleeved on the positioning column sleeve 32 for plugging a gap between an outer peripheral wall of the positioning column sleeve 32 and a hole wall of the buffer through hole, and a swing driver installed in the assembly cavity housing 31 and connected with the positioning column sleeve 32 for driving the positioning column sleeve 32 to swing relative to the buffer through hole.
Therefore, after the membrane group device to be cleaned is soaked in the cleaning agent, the transducer 33 can be started, and the cleaning agent and the dirt attached to the membrane group device are directly and indirectly acted by utilizing the cavitation effect, the acceleration effect and the direct current effect of the ultrasonic wave generated by the transducer in the liquid, so that the dirt is dispersed, emulsified and stripped to achieve the cleaning purpose; in the process, with reference to fig. 4, the positioning column sleeve 32 can be driven by the swing driver to synchronously drive the transducer 33 to swing at a certain angle relative to the cleaning water tank 10, so as to change the propagation direction of the sound wave, make the sound wave better tend to the spatial direction of the membrane module, and further accelerate the cleaning efficiency of the membrane module; meanwhile, due to the existence of the corrugated sleeve ring 34, the problem that cleaning agent leaks into the assembly cavity shell 31 in the process that the positioning column sleeve 32 synchronously drives the transducer 33 to swing can be avoided; it should be noted that: in practical applications, all the ultrasonic transducers 33 and the ultrasonic generating device may be electrically connected in parallel.
In order to increase the number of the ultrasonic transducers to the maximum extent, so as to form a complete sound source array in the bottom plate area of the cleaning water tank 10, and create conditions for reducing the structural complexity and cost of the whole device, the cleaning device of this embodiment further includes a plurality of fixed ultrasonic transducers 40 embedded in the central area of the bottom plate of the cleaning water tank 10 and distributed in a rectangular array, each fixed ultrasonic transducer 40 includes a positioning through hole (not shown in the figure) opened in the bottom plate of the cleaning water tank 10, a sandwich type piezoelectric transducer 41 with a front end portion penetrating through the distribution of the positioning through holes and a positioning ring groove (not marked in the figure) opened on the peripheral wall of the front end portion, and a positioning sealing sleeve 42 with a front end portion embedded in the positioning ring groove and a peripheral wall of the front end portion abutting against the hole wall. When the membrane module device is soaked in the cleaning water pool 10 in a standing mode, the position of the membrane module device in the cleaning water pool 10 is preferably generally in the central area, and at the moment, the fixed ultrasonic transducer 40 distributed in the area can meet the condition that the sound wave propagation direction tends to the membrane module device, so that the auxiliary adjustable ultrasonic transducer 30 forms a large-area sound source array on the bottom plate of the cleaning water pool 10; this minimizes the number of the arrangement of the adjustable ultrasonic transducers 40.
In order to maximize the utilization of sound waves, the inner wall of the side plate of the cleaning water tank 10 of the present embodiment is in the form of an arc surface, and the thickness of the side plate of the cleaning water tank 10 is gradually decreased from top to bottom. Therefore, when the sound waves propagate in the cleaning agent and meet the side wall of the cleaning water tank 10, the reflection effect on the sound waves can be formed based on the adopted cambered surface structure form with the thick upper part and the narrow lower part, so that the propagation path of the sound waves is changed to enable the sound waves to tend to the space direction of the membrane assembly after being reflected. As a preferred scheme, in order to enhance the reflection effect of the arc wall on the sound waves to the maximum, a plurality of reflection convex rings 11 are further arranged on the inner wall of the side plate of the cleaning water tank 10, wherein the reflection convex rings are sequentially distributed from top to bottom.
In order to enhance the flexibility of the whole cleaning device, especially to provide more comfortable operating conditions for cleaning membrane modules of different weights, as shown in fig. 5 and 6, the cleaning device of this embodiment further includes a plurality of elastic legs 50 disposed on the outer wall of the bottom plate of the cleaning basin 10, the elastic legs 50 include a leg sleeve seat 52 having a coaxial sleeve hole 51, a fixed column 53 having a top end fixed on the outer wall of the bottom plate of the cleaning basin 10 and a bottom end inserted into the coaxial sleeve hole 51, a plurality of buffer balls 54 circumferentially embedded on the bottom end peripheral wall of the fixed column 53 and contacting with the hole wall of the coaxial sleeve hole 51, and a return spring 55 having a top end connected with the bottom end face of the fixed column 53 and a bottom end connected with the bottom face of the coaxial sleeve hole 51. Therefore, by utilizing the elastic force effect generated by the return spring 55, after the membrane module is placed in the cleaning water tank 10, the fixed column 53, the cleaning water tank 10 and the like can move downwards (the return spring 55 is compressed) by the gravity generated by the membrane module, so that the cleaning water tank 10 and the like can be positioned in planes with different heights according to the weight of the membrane module, and the membrane module can be conveniently taken out by a cleaning person; in this process, the use of the damping balls 54 enhances the smoothness of the coaxial movement of the fixed post 53 relative to the toe box 52. Preferably, in order to enhance the structural compactness of the elastic leg 50, the fixing post 53 of the present embodiment includes a main post 53-1 fixed at the top end on the outer wall of the bottom plate of the cleaning water tank 10 and a limiting post 53-2 installed on the bottom end surface of the main post 53-1 and located in the coaxial sleeve hole 51, wherein the outer diameter of the limiting post 53-2 is greater than the inner diameter of the port of the coaxial sleeve hole 51, and the inner diameter of the port of the coaxial sleeve hole 51 is greater than the outer diameter of the main post 53-1; the plurality of buffering balls 54 are circumferentially and uniformly embedded on the circumferential wall of the limiting column 53-2. Thus, the return spring 55, the buffer ball 54, and the like can be arranged in the coaxial housing hole 51 in an encapsulated manner by utilizing the dimensional difference between the relevant components.
In order to effectively improve the swing effect of the transducer 33, as shown in fig. 2 and 3, the swing driver of the present embodiment includes a power shaft 35 distributed in a radial direction parallel to the buffer through hole, an eccentric balance 36 coaxially mounted on the power shaft 35 and abutting against the bottom end peripheral wall of the positioning column sleeve 32, a tension spring 37 having one end connected to the inner wall of the assembly chamber housing 31 and the other end connected to the middle peripheral wall of the positioning column sleeve 32, a compression spring 38 having one end connected to the hole wall of the buffer through hole and the other end connected to the peripheral wall of the top end of the positioning column sleeve 32, and a shaft rotation support arm 39 having one end fixed to the inner wall of the assembly chamber housing 31 and the other end pivotally connected to the peripheral wall of the positioning column sleeve 32; the compression spring 38, the axle support arm 39, the tension spring 37 and the eccentric balance 36 are arranged in sequence from top to bottom on the same side of the positioning cylinder 38 with respect to the positioning cylinder. Therefore, the power shaft 35 can be used as an input connecting component of the rotating power to drive the eccentric balance 36 to rotate synchronously, when the highest point of the eccentric balance 36 is in contact with the positioning column sleeve 32, the extension spring 37 is extended to the maximum length, and the compression spring 38 is compressed to the minimum length, at this time, the maximum offset angle is formed between the positioning column sleeve 32 and the transducer 33 compared with the initial position of the positioning column sleeve 32 and the transducer 33; conversely, the compression spring 38, the tension spring 37 and the eccentric balance 36 cooperate to ensure a smooth, gradual return of the positioning sleeve 32 together with the transducer 33.
As a preferable scheme, the cleaning device of the embodiment can adopt different power source structural forms to meet the action effect of the swing driver according to actual conditions; the method specifically comprises the following steps:
as shown in fig. 7, the cleaning device further includes four power motors 60, each power motor 60 corresponds to a plurality of adjustable ultrasonic transducers 30 distributed in rows or columns; the power shafts of the plurality of adjustable ultrasonic transducers 30 distributed in rows or columns are coaxially and sequentially connected in series to form a power spindle, and the power spindle is connected with the corresponding power motor 60. Thus, two rows and two columns of modulated ultrasonic transducers 30 can each have a single power motor 60, thereby achieving uniform oscillation control of all transducers in the row/column.
As shown in fig. 8, the cleaning device further includes a power motor 60, wherein power shafts of a plurality of adjustable ultrasonic transducers 30 distributed in rows or columns are coaxially and sequentially connected in series to form a power spindle, two ends of each power spindle are respectively provided with a bevel gear 70, and two adjacent bevel gears 70 are in meshing transmission connection; and a power motor 60 is connected to one of the power spindles. Therefore, the number of the power motors 60 can be effectively reduced, and the meshing relationship among the bevel gears 70 is utilized to realize the uniform swing control of all the adjustable ultrasonic transducers 30.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.

Claims (9)

1. An off-line cleaning device for a membrane module device comprises a cleaning water tank filled with cleaning agents and an isolation screen which is arranged in the cleaning water tank and used for immersing the membrane module device in the cleaning agents; the method is characterized in that: the ultrasonic cleaning device also comprises a plurality of adjustable ultrasonic transducers which are embedded at the side of the bottom plate of the cleaning water tank and are distributed in a rectangular ring shape;
the adjustable ultrasonic transducer comprises an assembly cavity shell hung on the outer wall of a bottom plate of the cleaning water tank, a buffer through hole arranged on the bottom plate of the cleaning water tank, a positioning column sleeve penetrating through the buffer through hole and distributed, a transducer installed in the top end part of the positioning column sleeve and exposed on the inner wall of the bottom plate of the cleaning water tank, a corrugated lantern ring sleeved on the positioning column sleeve and used for plugging a gap between the outer peripheral wall of the positioning column sleeve and the hole wall of the buffer through hole, and a swing driver installed in the assembly cavity shell and connected with the positioning column sleeve to drive the positioning column sleeve to swing relative to the buffer through hole.
2. The off-line cleaning device for the membrane module as claimed in claim 1, wherein: it still includes that a plurality of inlays the fixed ultrasonic transducer who is rectangular array distribution in the bottom plate central zone of wash basin and each other, fixed ultrasonic transducer runs through the sandwich type piezoelectric transducer who offers the positioning ring groove on the perisporium of positioning hole distribution and preceding tip and the positioning sealing cover that preceding tip gomphosis offsets in the positioning ring inslot and preceding tip's periphery wall and positioning hole's pore wall including locating positioning hole on the bottom plate of wash basin, preceding tip.
3. The off-line cleaning device for the membrane module as claimed in claim 1, wherein: the curb plate inner wall in washing pond is the cambered surface, just the thickness of the curb plate in washing pond from top to bottom progressively diminishes gradually.
4. The off-line cleaning device for the membrane module according to claim 3, wherein: the inner wall of the side plate of the cleaning water tank is also provided with a plurality of reflection convex rings which are sequentially distributed from top to bottom.
5. The off-line cleaning device for the membrane module as claimed in claim 1, wherein: the elastic supporting legs comprise a foot post sleeve seat with a coaxial sleeve hole, a fixed column with the top end fixed on the outer wall of the bottom plate of the cleaning water tank and the bottom end part inserted in the coaxial sleeve hole, a plurality of buffering balls circumferentially embedded on the bottom end peripheral wall of the fixed column and contacted with the hole wall of the coaxial sleeve hole, and a reset spring with the top end connected with the bottom end face of the fixed column and the bottom end connected with the bottom surface of the coaxial sleeve hole.
6. The off-line cleaning device for the membrane module according to claim 5, wherein: the fixed column comprises a main body column and a limiting column, wherein the top end of the main body column is fixed on the outer wall of the bottom plate of the cleaning water tank, the limiting column is arranged on the end face of the bottom end of the main body column and is positioned in the same shaft sleeve hole, the outer diameter of the limiting column is larger than the inner diameter of a port of the coaxial sleeve hole, and the inner diameter of the port of the coaxial sleeve hole is larger than the outer diameter; and the buffering balls are circumferentially and uniformly embedded on the circumferential wall of the limiting column.
7. The off-line membrane module cleaning device according to any one of claims 1 to 6, wherein: the swing driver comprises a power shaft distributed along the radial direction parallel to the buffer through hole, an eccentric balance wheel coaxially arranged on the power shaft and abutted against the peripheral wall of the bottom end of the positioning column sleeve, a tension spring with one end connected with the inner wall of the assembly cavity shell and the other end connected with the peripheral wall of the middle part of the positioning column sleeve, a compression spring with one end connected with the hole wall of the buffer through hole and the other end connected with the peripheral wall of the top end part of the positioning column sleeve, and a shaft rotating support arm with one end fixed on the inner wall of the assembly cavity shell and the other end in shaft rotating connection with the peripheral wall of the positioning column sleeve; relative to the positioning column sleeve, the compression spring, the shaft rotation supporting arm, the extension spring and the eccentric balance wheel are sequentially distributed on the same side of the positioning column sleeve from top to bottom.
8. The off-line cleaning device for the membrane module according to claim 7, wherein: the ultrasonic transducer also comprises four power motors, wherein each power motor corresponds to a plurality of adjustable ultrasonic transducers which are distributed in rows or columns; and the power shafts of the adjustable ultrasonic transducers are distributed in rows or columns and are coaxially and sequentially connected in series to form a power main shaft, and the power main shaft is connected with a corresponding power motor.
9. The off-line cleaning device for the membrane module according to claim 7, wherein: the ultrasonic transducer comprises a plurality of adjustable ultrasonic transducers, a power motor, a plurality of ultrasonic transducers and a plurality of ultrasonic transducers, wherein the adjustable ultrasonic transducers are arranged in a row or a column; the power motor is connected with one of the power main shafts.
CN201921030723.0U 2019-07-03 2019-07-03 Off-line cleaning device for membrane module device Expired - Fee Related CN210448765U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921030723.0U CN210448765U (en) 2019-07-03 2019-07-03 Off-line cleaning device for membrane module device

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Application Number Priority Date Filing Date Title
CN201921030723.0U CN210448765U (en) 2019-07-03 2019-07-03 Off-line cleaning device for membrane module device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115477366A (en) * 2022-10-20 2022-12-16 重庆海通环保科技有限公司 Antipollution reverse osmosis membrane device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115477366A (en) * 2022-10-20 2022-12-16 重庆海通环保科技有限公司 Antipollution reverse osmosis membrane device

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