CN216005340U - Single-suction type jet aeration device - Google Patents
Single-suction type jet aeration device Download PDFInfo
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- CN216005340U CN216005340U CN202122176176.0U CN202122176176U CN216005340U CN 216005340 U CN216005340 U CN 216005340U CN 202122176176 U CN202122176176 U CN 202122176176U CN 216005340 U CN216005340 U CN 216005340U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The utility model discloses a single formula efflux aeration equipment that inhales, include: nozzle, breathing pipe, suction chamber, choke and diffuser pipe, the nozzle includes: a nozzle body and an orifice disposed at an outlet end of the nozzle body; the orifice is of a circular ring structure and comprises a first section and a second section which are sequentially connected along the jet flow direction; the inner wall of the first section has the same diameter, and the inner diameter of the first section is smaller than the inner diameter of the outlet end of the nozzle main body; the inner wall of the second section is of a flaring structure, the first end, close to the first section, of the second section is a small end, the inner diameter of the second section is equal to that of the first section, the second end, far away from the first section, of the second section is a large end, and the inner diameter of the second section is smaller than that of the outlet end of the nozzle body. In this scheme, the osculum through drill way aperture designs to reduce the aperture of nozzle outlet, with the velocity of flow of increase nozzle outlet rivers, and then with the inside pressure that reduces the ejector, so that the ejector inside is in the great value with external pressure differential, thereby has increased the negative pressure effect of ejector, can help improving the aeration effect of ejector.
Description
Technical Field
The utility model relates to the technical field of sewage treatment, in particular to single-suction jet aeration device.
Background
In sewage treatment projects, aerobic reactions are the main means of organic matter decomposition, and a suitable jet aerator is required to supply sufficient oxygen for the aerobic reactions. The existing single-suction jet aerator is a negative pressure air supply (self-suction) jet aerator, and takes away air in an air suction chamber through viscous action between high-speed jet ejected by a nozzle and the air, so that the suction chamber generates negative pressure, and the air in the atmosphere is continuously sucked.
However, the inside of the existing single-suction jet aerator is difficult to generate strong negative pressure, which affects the aeration effect of the single-suction jet aerator to a certain extent; and there are instances of turbulence in the water stream ejected from the nozzle outlet.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a single-suction type efflux aeration equipment can pass through the osculum design in drill way aperture to in the aperture that reduces the nozzle export, with the velocity of flow that increases nozzle outlet rivers, and then with reduced the inside pressure of ejector, so that the pressure differential inside and the external world of ejector is in the great value, thereby has increased the negative pressure effect of ejector, with this aeration effect that can help improving the ejector. Certainly, based on the flaring formula design of this scheme second section inner wall, still can be favorable to increasing the laminar flow of nozzle outlet rivers, reduce the torrent of rivers, and then help having ensured the stability of nozzle outlet rivers injection.
In order to achieve the above object, the utility model provides a following technical scheme:
a single suction jet aeration device comprising: nozzle, breathing pipe, suction chamber, choke and diffuser pipe, the nozzle includes: a nozzle body and an orifice disposed at an outlet end of the nozzle body;
the orifice is of a circular ring structure and comprises a first section and a second section which are sequentially connected along the jet flow direction; the inner wall of the first section is of equal diameter, and the inner diameter of the first section is smaller than the inner diameter of the outlet end of the nozzle main body; the inner wall of the second section is of a flaring structure, the first end, close to the first section, of the second section is a small end, the inner diameter of the second section is equal to that of the first section, the second end, far away from the first section, of the second section is a large end, and the inner diameter of the second section is smaller than that of the outlet end of the nozzle body.
Preferably, the flaring angle of the inner wall of the second section is 45 °.
Preferably, the nozzle further comprises: an orifice mount for securing the orifice to the nozzle body outlet end.
Preferably, one side of the orifice fixing piece is in threaded fit with the outer wall of the outlet end of the nozzle body, and the other side of the orifice fixing piece is used for clamping the orifice at the outlet end of the nozzle body.
Preferably, the outer diameter of the orifice is equal to the outer diameter of the nozzle body outlet end;
the orifice mount includes: the fixing ring and the clamping ring are sequentially connected along the jet flow direction;
the inner wall of the fixing ring, which is close to the snap ring part, is used for sleeving the outer walls of the first section and the second section, and the inner wall of the rest part is in threaded fit with the outer wall of the outlet end of the nozzle main body; the inner end of the snap ring is in contact fit with the second end, far away from the first section, of the second section, and the inner diameter of the snap ring is larger than that of the second section.
Preferably, the inner wall of the snap ring is of a flaring structure, and the inner end of the snap ring is a small end.
Preferably, the method further comprises the following steps:
a nozzle flange welded to an outer wall of the nozzle inlet end.
Preferably, the method further comprises the following steps:
and the air suction pipe flange is welded on the outer wall of the air inlet end of the air suction pipe and used for connecting the air inlet pipe.
Preferably, the method further comprises the following steps: a reducer connected between the suction chamber and the throat;
the reducer pipe is of a reducing structure, one end of the reducer pipe, which is close to the suction chamber, is a large-head end, and the contraction angle of the reducer pipe is 40-60 degrees.
Preferably, the diffusion angle of the diffusion tube is 4-10 °.
According to the above technical scheme, the utility model provides an among the single suction type efflux aeration equipment, through the osculum design in drill way aperture to in the aperture that reduces the nozzle export, with the velocity of flow of increase nozzle export rivers, and then with the inside pressure that has reduced the ejector, so that the ejector is inside to be in great value with external pressure differential, thereby has increased the negative pressure effect of ejector, with this aeration effect that can help improving the ejector. Certainly, based on the flaring formula design of this scheme second section inner wall, still can be favorable to increasing the laminar flow of nozzle outlet rivers, reduce the torrent of rivers, and then help having ensured the stability of nozzle outlet rivers injection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of a single suction type jet aeration apparatus provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an orifice provided in an embodiment of the present invention;
fig. 3 is a schematic structural view of an orifice mount according to an embodiment of the present invention;
fig. 4 is a working schematic diagram of the single suction type jet aeration device provided by the embodiment of the utility model.
Wherein, 1 is a nozzle, 1.1 is a nozzle main body, 1.2 is an orifice, 1.21 is a first section, 1.22 is a second section, 1.3 is an orifice fixing piece, 1.31 is a fixing ring, and 1.32 is a snap ring; 2 is an air suction pipe; 3 is a suction chamber; 4 is a throat pipe, 4.1 is a jet flow section, and 4.2 is a mixed torrent section; 5 is a diffusion tube, and 5.1 is an emulsifying section; 6 is a nozzle flange; 7 is a suction pipe flange; and 8 is a reducer pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
The embodiment of the utility model provides a single suction type efflux aeration equipment, as shown in figure 1, includes: a nozzle 1, an air suction pipe 2, a suction chamber 3, a throat pipe 4 and a diffuser pipe 5; the nozzle 1 includes: a nozzle body 1.1 and an orifice 1.2 disposed at an outlet end of the nozzle body 1.1;
the orifice 1.2 is of a circular ring structure and comprises a first section 1.21 and a second section 1.22 which are sequentially connected along the jet flow direction; the inner wall of the first section 1.21 has the same diameter, and the inner diameter of the first section is smaller than the inner diameter of the outlet end of the nozzle body 1.1; the inner wall of the second section 1.22 is of a flaring structure, the first end, close to the first section 1.21, of the second section 1.22 is a small end, the inner diameter of the first section 1.21 is equal to that of the second section, the second end, far away from the first section 1.21, of the second section 1.22 is a large end, and the inner diameter of the second end is smaller than that of the outlet end of the nozzle body 1.1.
In this embodiment, it should be noted that the orifice 1.2 is coaxially disposed at the outlet end of the nozzle body 1.1; wherein, the first section 1.21 of the orifice 1.2 is arranged at the outlet end of the nozzle body 1.1 and is connected with the second section 1.22 thereof; in addition, according to the scheme, the inner walls of the first section 1.21 and the second section 1.22 are designed to be small (smaller than the inner diameter of the outlet end of the nozzle main body 1.1) so as to reduce the aperture of the outlet of the nozzle 1, increase the flow rate of water flow at the outlet of the nozzle 1 and further reduce the pressure inside the ejector, so that the pressure difference between the inside of the ejector and the outside is increased, namely, the negative pressure effect of the ejector is increased; that is to say, this scheme is through the change in 1.2 apertures in the drill way to the velocity gradient of change rivers, so that the pressure differential of ejector inside and external is in the great value, reaches the effect that has increased the ejector negative pressure effect, thereby helps improving the aeration effect of ejector, has also improved the oxygenation efficiency of ejector. In addition, the inner wall of the second section 1.22 is designed to be a horn small opening (inner wall gradually expanding structure), so that the laminar flow of the water flow at the outlet of the nozzle 1 is increased, the turbulent flow of the water flow is reduced, and the stability of the water flow jet at the outlet of the nozzle 1 is ensured; of course, the axial dimension of the second section 1.22 is very small, its effect on the flow rate of the water flow being not very negligible; in addition, the ejector in the scheme is made of stainless steel or composite materials (plastics) and the like.
According to the above technical scheme, the embodiment of the utility model provides an among the single suction type efflux aeration equipment, through the osculum design in drill way aperture to in the aperture that reduces the nozzle export, with the velocity of flow of increase nozzle export rivers, and then with the inside pressure that has reduced the ejector, so that the ejector is inside to be in great value with external pressure differential, thereby has increased the negative pressure effect of ejector, with this aeration effect that can help improving the ejector. Certainly, based on the flaring formula design of this scheme second section inner wall, still can be favorable to increasing the laminar flow of nozzle outlet rivers, reduce the torrent of rivers, and then help having ensured the stability of nozzle outlet rivers injection.
In particular, in order to better increase the laminar flow of the water flow at the outlet of the nozzle 1, the turbulence of the water flow is reduced; accordingly, as shown in FIG. 2, the flare angle of the inner wall of the second section 1.22 is 45.
In the scheme, the orifice 1.2 is fixedly arranged at the outlet end of the nozzle main body 1.1 so as to ensure the stability of the assembly of the orifice 1.2; accordingly, as shown in fig. 1, the nozzle 1 further includes: an orifice mount 1.3 for securing the orifice 1.2 to the outlet end of the nozzle body 1.1.
Specifically, one side of the orifice fixing piece 1.3 is in threaded fit with the outer wall of the outlet end of the nozzle body 1.1, and the other side of the orifice fixing piece is used for clamping the orifice 1.2 to the outlet end of the nozzle body 1.1. That is, the orifice fixing member 1.3 is pressed by the thread bush, and the orifice 1.2 is fixed.
Specifically, as shown in fig. 1, the outer diameter of the orifice 1.2 is equal to the outer diameter of the outlet end of the nozzle body 1.1;
as shown in fig. 3, the orifice mount 1.3 includes: a fixed ring 1.31 and a snap ring 1.32 which are connected in sequence along the jet flow direction;
the inner wall of the part, close to the snap ring 1.32, of the fixing ring 1.31 is used for being sleeved with the outer walls of the first section 1.21 and the second section 1.22, so that the radial fixation of the orifice 1.2 is realized; the inner wall of the rest part of the fixing ring 1.31 is in threaded fit with the outer wall of the outlet end of the nozzle main body 1.1; the inner end of the snap ring 1.32 (the end of the snap ring 1.32 close to the fixed ring 1.31) is in contact fit with the second end of the second section 1.22 far away from the first section 1.21 (namely, in contact fit with the end surface), so that the axial fixation of the orifice 1.2 is realized; the inner diameter of the snap ring 1.32 is larger than that of the second section 1.22, so that the influence on the flow speed of the water flow at the outlet of the nozzle 1 is avoided. In addition, the orifice fixing piece 1.3 is designed like this, and has the characteristics of simple structure, convenient assembly and disassembly and the like.
In order to further optimize the technical scheme, the laminar flow of the water flow at the outlet of the nozzle 1 is further increased, and the turbulent flow of the water flow is reduced; correspondingly, as shown in fig. 1, the inner wall of the snap ring 1.32 is of a flaring structure, and the inner end thereof is a small end; wherein, the inner diameter of the inner end of the snap ring 1.32 is equal to the inner diameter of the outlet end of the nozzle body 1.1.
Further, as shown in fig. 1, the single suction type jet aeration apparatus provided in the embodiment of the present invention further includes:
a nozzle flange 6 welded on the outer wall of the inlet end of the nozzle 1 so as to facilitate the connection between the inlet end of the nozzle 1 and the water inlet pipe; and the inlet end of the nozzle 1 is connected with the water inlet pipe through the nozzle flange 6, and the device has the characteristics of simple structure, convenient connection, reliable connection and the like.
Still further, as shown in fig. 1, the single suction type jet aeration apparatus provided in the embodiment of the present invention further includes:
an air suction pipe flange 7 welded on the outer wall of the air inlet end of the air suction pipe 2 and used for connecting an air inlet pipe so as to facilitate the connection of the air inlet end of the air suction pipe 2 and the air inlet pipe; and the air inlet end of the air suction pipe 2 is connected with the air inlet pipe through an air suction pipe flange 7, and the air suction pipe has the characteristics of simple structure, convenience in connection, reliability in connection and the like.
In the scheme, as shown in fig. 1, the diameter of the suction chamber 3 and the diameter of the throat 4 are different, so that in order to reduce turbulence in the ejector and avoid consuming kinetic energy of water flow, an angle flow guide is required to be arranged between the suction chamber 3 and the throat 4; correspondingly, as shown in fig. 1, the single suction type jet aeration apparatus provided by the embodiment of the present invention further comprises: a reducer 8 connected between the suction chamber 3 and the throat 4 so as to enhance the laminar flow of the water flow;
the reducer pipe 8 is of a necking structure, one end of the reducer pipe close to the suction chamber 3 is a large end, and the contraction angle of the reducer pipe 8 is 40-60 degrees; preferably, as shown in fig. 1, the reducing pipe 8 has a contraction angle of 45 °.
In particular, in order to minimize the resistance to which the diffuser tube 5 is subjected; correspondingly, the diffusion angle of the diffusion pipe 5 is 4-10 degrees; preferably, the diffuser pipe 5 has a diffusion angle of 4 ° as shown in fig. 1.
The present solution is further described below with reference to specific embodiments:
the utility model discloses a single suction type jet aerator and immersible pump (or centrifugal pump) equipment back can have the function of oxygen suppliment concurrently, cut activated sludge floc and air, regeneration activated sludge and the mixed liquid of stirring. Compared with the blast aeration method, the method does not need a blower, a gas transmission pipeline and an air diffusion device. Compared with the mechanical aeration method, the method does not need equipment such as a high-power driving motor, a reduction box, an aeration impeller, an aeration rotary brush and the like.
The oxygenation efficiency of the single-suction jet aerator is determined by the working pressure, the working flow, the outlet pressure and the installation mode of the jet aerator. The single suction type jet aerator is a negative pressure air supply (self suction type) jet aerator, and consists of a nozzle, an air suction pipe, a suction chamber, a throat pipe and a diffusion pipe. The viscous action between the high-speed jet flow sprayed out from the nozzle of the jet aerator and the air is adopted to take away the air in the suction chamber, so that the suction chamber generates negative pressure, and the air in the atmosphere is continuously sucked. The jet flow carrying air enters the throat, the front half section of the throat is a jet flow section 4.1 (shown in figure 1), liquid and gas are continuous flows, the gas and the liquid exchange energy only between contact surfaces, the gas is not cut, and the transfer of oxygen is limited. In the latter half of the throat, namely the mixing shock section 4.2 (as shown in figure 1), due to the dual effects of the kinetic energy of the jet and the back pressure at the tail end of the jet aerator, gas and liquid form a mixing shock wave, the gas and liquid exchange energy violently, the gas is beaten into an emulsion shape to form a homogeneous emulsion, and the diameter of the bubbles is about 100 μm. After entering the diffuser, the bubbles are further compressed due to the change of the flow head into a pressure head. The oxygen transfer rate is therefore very rapid in a jet aerator. The wave velocity of the mixed shock wave can reach subsonic velocity, so that the high-speed water flow and the sucked gas are fully exchanged, and the kinetic energy of the water flow is converted into pressure energy to the gas to be emulsified.
Wherein, the mixed shock wave is mainly realized by a certain length of the throat pipe; specifically, the front part of the throat is a jet flow section, and in the front part of the throat, because the high-speed jet flow has high liquid speed and large kinetic energy, liquid and gas are not fully mixed, the liquid and the gas are continuous flows, the gas and the liquid exchange energy only between contact surfaces, and the gas is not cut. In the latter half of the throat, namely the mixing torrent section, because the fluid kinetic energy of the jet flow is reduced and the back pressure at the tail end of the jet flow aerator exists, the gas-liquid two phases are subjected to violent energy exchange, the gas-liquid forms mixing shock waves, and the gas is beaten into an emulsified state to form homogeneous emulsion.
In the latter half of the throat, the gas and liquid form a mixed shock wave under the dual action of the kinetic energy of the jet and the back pressure at the tail end of the jet aerator.
When the ejector is submerged in water, the whole ejector is submerged. Filled with water which contributes to the water and air flow in the jet section (i.e. the above mentioned counter pressure, i.e. resistance), which explains why two sections (jet section and mixed laser section) are created in the throat.
The water jetted from the nozzle is firstly subjected to a small section of stable flow velocity section (jetting section) in the throat pipe, but then is disturbed by the resistance in the water, and the gas and the liquid start to be violently turbulent to form a mixed shock wave section.
In the injection section before the shock wave is mixed, the gas phase and the liquid phase respectively keep continuous flow, such as an i-i section view of the working principle diagram of the jet aerator shown in fig. 4, the gas pressure PS (atmospheric pressure), the flow rate of the working liquid vg and the flow rate of the gas phase vs and the liquid phase vs, and the mixed liquid is heterogeneous. And the mixed liquid is formed by mixing the shock wave section and the diffusion pipe section, the pressure of the second half section of the shock wave is higher than that of the first half section of the shock wave, and the speed is lower and is generally lower than the speed of sound. The pressure PS is gradually increased to Pg; the speed of the gas phase and the liquid phase is reduced and changed into the same flow speed until the outlet of the diffusion pipe.
In addition, after the mixed shock wave enters the diffusion tube from the throat tube, the flow velocity of the shock wave is reduced due to the fact that the diffusion tube is of a horn mouth type structure, and kinetic energy of the shock wave is converted into potential energy. In the equipment, a single-suction jet device is vertically arranged, the gravitational potential energy of the gas-water mixed liquid in the jet device is continuously reduced, and the reduced kinetic energy is not converted into gravitational potential energy upwards according to the law of conservation of mechanical energy, but forms pressure (namely elastic potential energy) towards the peripheral inner wall in shock waves. The inner wall of the jet device acts on the shock wave again in a reaction force mode, so that bubbles in the shock wave are further compressed, and the transfer of oxygen is accelerated.
The oxygenation results in clear water show that the working pressure is 90-93kpa, the outlet pressure is 8-8.4kpa, the spray coefficient is 1.3-1.35, the power efficiency is 2.0-2.08 kg/(kW.h), and the total power efficiency is 1.0-1.05 kg/(kWh.h).
In addition, the flanges must be strictly perpendicular to the axis during welding, the deviation of the axis must not be more than 0.1mm, the inner surface must be strictly smooth, each welding line must be smooth, the surface of each pair of flanges must be smooth, and the flanges must be strictly tight after assembly without water leakage.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A single suction jet aeration device comprising: nozzle (1), breathing pipe (2), suction chamber (3), choke (4) and diffuser (5), its characterized in that, nozzle (1) includes: a nozzle body (1.1) and an orifice (1.2) provided at an outlet end of the nozzle body (1.1);
the orifice (1.2) is of a circular ring structure and comprises a first section (1.21) and a second section (1.22) which are sequentially connected along the jet flow direction; the inner wall of the first section (1.21) is of equal diameter, and the inner diameter of the first section is smaller than that of the outlet end of the nozzle main body (1.1); the inner wall of the second section (1.22) is of a flaring structure, the first end, close to the first section (1.21), of the second section (1.22) is a small end, the inner diameter of the first section is equal to that of the first section (1.21), the second end, far away from the first section (1.21), of the second section (1.22) is a large end, and the inner diameter of the second end is smaller than that of the outlet end of the nozzle body (1.1).
2. A single suction jet aeration device according to claim 1, characterized in that the flaring angle of the inner wall of the second section (1.22) is 45 °.
3. A single suction jet aeration device according to claim 1, characterized in that said nozzle (1) further comprises: an orifice mount (1.3) for securing the orifice (1.2) to the outlet end of the nozzle body (1.1).
4. A single suction jet aeration device according to claim 3, wherein the orifice mount (1.3) is screw-fitted with the outer wall of the outlet end of the nozzle body (1.1) on one side and is adapted to snap-fit the orifice (1.2) to the outlet end of the nozzle body (1.1) on the other side.
5. A single suction jet aeration device according to claim 4, characterized in that the outer diameter of the orifice (1.2) is equal to the outer diameter of the outlet end of the nozzle body (1.1);
the orifice mount (1.3) comprises: a fixed ring (1.31) and a snap ring (1.32) which are connected in sequence along the jet flow direction;
the inner wall of the part, close to the snap ring (1.32), of the fixing ring (1.31) is used for being sleeved with the outer walls of the first section (1.21) and the second section (1.22), and the inner wall of the rest part is in threaded fit with the outer wall of the outlet end of the nozzle main body (1.1); the inner end of the snap ring (1.32) is in contact fit with the second end, far away from the first section (1.21), of the second section (1.22), and the inner diameter of the snap ring (1.32) is larger than that of the second section (1.22).
6. A single suction jet aeration device according to claim 5, wherein the inner wall of the retainer ring (1.32) is of a flared configuration and its inner end is a small end.
7. The single suction jet aeration device of claim 1, further comprising:
and the nozzle flange (6) is welded on the outer wall of the inlet end of the nozzle (1).
8. The single suction jet aeration device of claim 1, further comprising:
the outer wall of the air inlet end of the air suction pipe (2) is welded with the air suction pipe flange (7) for connecting the air suction pipe.
9. A single suction jet aeration device according to claim 1, further comprising a reducer (8) connected between said suction chamber (3) and said throat (4);
the reducer pipe (8) is of a necking structure, one end of the reducer pipe close to the suction chamber (3) is a large end, and the contraction angle of the reducer pipe (8) is 40-60 degrees.
10. A single suction jet aeration device according to claim 1, characterized in that the diffusion angle of the diffuser pipe (5) is comprised between 4 ° and 10 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122176176.0U CN216005340U (en) | 2021-09-09 | 2021-09-09 | Single-suction type jet aeration device |
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| CN202122176176.0U CN216005340U (en) | 2021-09-09 | 2021-09-09 | Single-suction type jet aeration device |
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| CN216005340U true CN216005340U (en) | 2022-03-11 |
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