CN117945547A - Pulse aeration generating device - Google Patents

Abstract

The invention discloses a pulse aeration generating device, which belongs to the field of sewage treatment devices and comprises an outer shell, an inner shell, an air distribution member and an aeration assembly, wherein an air inlet chamber with an open lower end is arranged in the outer shell, a first air inlet is arranged on the side wall of the outer shell, the inner shell is arranged in the air inlet chamber, an aeration chamber with the open lower end is arranged in the inner shell, a first air outlet communicated with the aeration chamber is arranged on the top wall of the outer shell, the air distribution member is arranged in the air inlet chamber, the air distribution member and the top wall of the outer shell are arranged at intervals, the air distribution member is internally provided with the air distribution chamber with the open lower end, the top of the air distribution member is provided with a third air inlet, the height of the third air inlet in the vertical direction is higher than that of the first air inlet, a second air outlet communicated with the air distribution chamber and the aeration chamber is arranged on the side wall of the air distribution member, and the aeration assembly is arranged in the aeration chamber, and the aeration assembly is used for guiding air to be discharged from the first air outlet to realize aeration. The pulse aeration generating device can reduce the risk of blocking the second air outlet.

Description

Pulse aeration generating device

Technical Field

The invention relates to the technical field of sewage treatment devices, in particular to a pulse aeration generating device.

Background

The immersed ultrafiltration device adopts the technical principle of membrane separation, is widely applied to the fields of water purification, sewage treatment, material separation and the like, and particularly in the field of sewage treatment, a Membrane Bioreactor (MBR) process has become a mainstream process of sewage treatment. The ultrafiltration membrane group device of the MBR is immersed in a mud-water mixture in the membrane tank, water treated by activated sludge is sucked into the inner cavity of the hollow fiber membrane through micropores on the surface of the membrane wire under the suction of negative pressure of the water producing pump, and the activated sludge and pollutants which cannot pass through the micropores on the surface of the membrane wire are blocked outside the membrane wire, so that mud-water separation is realized. In the operation process, concentration polarization can be generated on the outer surface of the membrane wire, activated sludge and pollutants are adsorbed on the outer surface of the membrane wire to form a filter cake layer, resistance is formed for filtration and an ultrafiltration membrane is polluted, MBR water production is affected, the traditional MBR process causes water turbulence through high-strength aeration, the membrane wire is enabled to shake, and then the sludge and pollutants on the surface of the membrane wire fall off in membrane wire shake, so that the aim of cleaning the MBR membrane wire is achieved.

The aeration mode of the MBR process mainly comprises continuous aeration of a perforated pipe and intermittent aeration of the perforated pipe, wherein the continuous aeration of the perforated pipe is that the perforated aeration pipe is arranged at the bottom of the MBR membrane module device for uninterrupted aeration, the aeration mode is easy to cause the blocking of the aeration hole of the perforated pipe, so that the problem of mud accumulation is caused by no aeration at the local part of the MBR membrane module device, and the aeration energy consumption is highest; the intermittent aeration of the perforated pipe is realized by arranging an automatic control valve and opening and closing a program control valve, and compared with the continuous aeration energy consumption of the perforated pipe, the intermittent aeration of the perforated pipe is reduced, but the control valve causes more valve faults, thereby affecting the normal operation of a membrane system; the pulse aeration is an aeration mode of the current immersed ultrafiltration main flow, continuously aerated air is collected and temporarily stored through a pulse aerator and released in a pulse mode, the instantaneous aeration quantity of the pulse aeration is several times of the instantaneous continuous aeration quantity, and no aeration or little aeration is carried out in other times of the pulse aeration period, so that the purposes of intermittently aerating and saving the aeration quantity and improving the instantaneous aeration quantity are achieved, and the purpose of strongly disturbing the cleaning membrane wires is achieved. The conventional pulse aeration device has low gas flow rate of the gas inlet chamber, and small fluctuation change of the gas-liquid interface, so that the gas outlet connected with the gas inlet chamber and the pulse aeration chamber is easy to be blocked.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a pulse aeration generating device, which solves the problem that a pulse aerator is easy to block in the prior art.

According to an embodiment of the present invention, a pulse aeration generating apparatus includes:

the shell is internally provided with an air inlet cavity with an open lower end, and the side wall of the shell is provided with a first air inlet which is communicated with the air inlet cavity and is externally connected with air supply equipment;

The inner shell is arranged in the air inlet chamber, the inner shell is connected below the top wall of the outer shell, an aeration chamber with an open lower end is arranged in the inner shell, a first air outlet communicated with the aeration chamber is arranged on the top wall of the outer shell, and a second air inlet communicated with the air inlet chamber and the aeration chamber is arranged on the side wall of the inner shell;

The air distribution piece is arranged in the air inlet chamber, the air distribution piece and the top wall of the shell are arranged at intervals, an air distribution chamber with an open lower end is arranged in the air distribution piece, a third air inlet which is communicated with the air distribution chamber and the air inlet chamber is arranged at the top of the air distribution piece, and a second air outlet which is communicated with the air distribution chamber and the second air inlet is arranged on the side wall of the air distribution piece;

the aeration component is arranged in the aeration chamber and is used for guiding gas to be discharged from the first gas outlet so as to realize aeration.

The pulse aeration generating device provided by the embodiment of the invention has at least the following beneficial effects:

The air supply equipment performs pulse aeration to the air inlet chamber through the first air inlet, gas is extruded to move downwards in the air inlet chamber, the gas enters the air distribution chamber along the third air inlet of the air distribution piece, enters the aeration chamber through the second air outlet and the second air inlet, is guided by the aeration component, and is discharged from the first air outlet for aeration; when the air supply equipment stops aeration, the space above the first air inlet in the vertical direction in the air inlet cavity forms an air chamber, and because the height of the third air inlet in the vertical direction is higher than that of the first air inlet, sewage in the air inlet cavity cannot flow through the third air inlet of the air distribution piece, and further the air distribution cavity above the second air outlet in the air distribution piece is always in a gas phase, so that the second air outlet (corresponding to the air outlet connected with the pulse aeration cavity in the air inlet cavity in the background technology) is prevented from being blocked due to the adhesion and deposition of activated sludge in the sludge-water mixture in the air distribution cavity.

The third air inlet at the top of the air distribution piece is small in aperture, the flow velocity of the purge air in the air inlet chamber is low, the static pressure is high, and when the purge air enters the air distribution chamber of the air distribution piece through the third air inlet of the air distribution piece, the flow velocity of the air flowing into the air distribution piece is obviously increased due to the resistance provided by the air distribution assembly, and the static pressure is reduced. The pressure and the flow rate of the air in the air inlet chamber are obviously different from those of the air in the air distribution chamber, so that the resistance of the air entering each air distribution member (when a plurality of air distribution members are arranged in the air distribution chamber, the plurality of air distribution members work simultaneously) tends to be the same, the distribution of the air in the air inlet chamber is not obviously influenced after the air is discharged by each air distribution member, the air inflow of each air distribution chamber (when a plurality of air distribution chambers are arranged in the air distribution chamber, the plurality of air distribution chambers work simultaneously) tends to be the same, the aeration is more uniform, and the smaller the aeration air flow is, the more uniform the aeration is.

Through the setting of distribution spare, form the gas distribution resistance in the air inlet chamber, the gas distribution resistance can make the air inlet chamber be full of air inlet chamber upper end when admitting air, avoids activated sludge in the mud water mixture to deposit at the air inlet chamber and takes place to block up, can make the gas velocity in the air distribution chamber in the distribution spare show more than the gas velocity in the air inlet chamber again, and the second gas outlet is erodeed to higher speed, alleviates the risk that the second gas outlet of distribution spare blockked up.

According to some embodiments of the invention, the side wall of the air distribution piece is connected to the outer surface of the inner shell, the second air outlet is located at one side of the air distribution piece close to the inner shell, the outline of the second air inlet is greater than or equal to that of the second air outlet, the second air outlet is in a notch shape, the bottom of the air distribution piece is recessed upwards to form the second air outlet, and the length direction of the second air outlet is vertical.

According to some embodiments of the invention, the aeration assembly comprises an aeration pipe, the aeration pipe is positioned in the aeration chamber, an aeration channel communicated with the first air outlet and the aeration chamber is arranged in the aeration pipe, and the upper end of the aeration pipe is connected below the top wall of the shell.

According to some embodiments of the invention, the aeration channel comprises a gas collecting part, a resistance part and an aeration part which are communicated sequentially from bottom to top, wherein the inner diameter of the gas collecting part is larger than that of the aeration part, and the inner diameter of the cross section of the resistance part gradually decreases along the upward direction.

According to some embodiments of the invention, the aeration pipe comprises a sleeve and a resistance block, the upper end of the sleeve is connected below the top wall of the shell, the resistance block is arranged at one end, close to the first air outlet, in the sleeve, and is in sealing connection with the inner wall of the sleeve, a through hole which is communicated with the first air outlet and the interior of the sleeve is arranged on the resistance block, the lower end of the through hole is in a chamfer arrangement, a part, positioned below the resistance block, in the sleeve forms the air collecting part, a chamfer part of the through hole forms the resistance part, and a part, positioned above the chamfer part of the through hole, forms the aeration part.

According to some embodiments of the invention, the aeration assembly further comprises a drain cup, the drain cup is located in the aeration chamber, a drain chamber with an open upper end is arranged in the drain cup, the drain cup is arranged at intervals with the top wall of the shell, and the lower end of the aeration pipe extends into the drain chamber.

According to some embodiments of the invention, a drain opening is provided in the bottom wall of the drain cup that communicates the drain chamber with the aeration chamber.

According to some embodiments of the invention, the air intake chamber is disposed around the inner shell.

According to some embodiments of the invention, the pulse aeration generating device further comprises a gas distribution cap, the gas distribution cap is connected to the first gas outlet position above the shell, a gas distribution cavity is arranged in the gas distribution cap, a fourth gas inlet which is communicated with the first gas outlet and the gas distribution cavity is arranged at the lower end of the gas distribution cap, a plurality of third gas outlets which are communicated with the gas distribution cavity are arranged on the side wall of the gas distribution cap, a flow guide division plate is arranged in the gas distribution cap, and the flow guide division plate is used for guiding gas to be discharged from the plurality of third gas outlets.

According to some embodiments of the invention, the housing is connected with an air inlet pipe, an air inlet channel communicated with the first air inlet is arranged in the air inlet pipe, and the air inlet pipe is used for externally connecting air supply equipment.

Additional aspects and advantages of the invention will be set forth in part in the description which follows.

Drawings

The invention is further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a sectional view of a pulse aeration generating device according to an embodiment of the present invention in a vertical direction and a length direction of the pulse aeration generating device;

fig. 2 is a cross-sectional view of a pulse aeration generating apparatus according to an embodiment of the present invention in a horizontal direction;

FIG. 3 is a top view of the pulse aeration generator according to the embodiment of the present invention with the gas separation cap removed;

fig. 4 is a cross-sectional view of a pulse aeration generating device according to an embodiment of the present invention in a vertical direction and a width direction of the pulse aeration generating device;

FIG. 5 is a schematic diagram of the aeration principle and path of a pulse aeration generating device according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a gas distribution member of a pulse aeration generating device according to an embodiment of the present invention;

Fig. 7 is a sectional view of an aeration tube of a pulse aeration generating apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the principle of the change of the air-hydraulic pressure difference during aeration of the aeration assembly in the prior art;

FIG. 9 is a schematic diagram of the principle of the change of the air-hydraulic pressure difference when the aeration assembly of the pulse aeration generating device according to the embodiment of the invention is aerated;

FIG. 10 is a schematic diagram of aeration gas distribution in the prior art;

FIG. 11 is a schematic diagram of aeration distribution of a pulse aeration generator according to an embodiment of the present invention;

fig. 12 is a sectional view of a gas separation cap of the pulse aeration generating apparatus according to the embodiment of the present invention.

Reference numerals:

100. a housing; 110. an air intake chamber; 120. a first air inlet; 130. a first air outlet; 140. an air inlet pipe; 150. a support rod;

200. An inner case; 210. an aeration chamber;

300. a gas distribution member; 310. a gas distribution chamber; 320. a third air inlet; 330. a second air outlet;

400. an aeration assembly; 410. an aeration pipe; 411. an aeration channel; 4111. a gas collecting part; 4112. a resistance section; 4113. an aeration section; 412. a sleeve; 413. a resistance block; 420. a drain cup; 421. a drainage chamber; 422. a water outlet;

500. An air distribution cap; 510. a gas separation chamber; 520. a fourth air inlet; 530. a third air outlet; 540. and a flow guiding partition plate.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, 2,3 and 4, a pulse aeration generating device according to an embodiment of the present invention includes an outer housing 100, an inner housing 200, and a gas distribution and aeration assembly 400. An air inlet chamber 110 is arranged in the shell 100, and the lower end of the air inlet chamber 110 is arranged in an open mode. The side wall of the housing 100 is provided with a first air inlet 120, the first air inlet 120 is communicated with the air inlet chamber 110, and the first air inlet 120 is used for externally connecting air supply equipment. The inner case 200 is disposed in the air inlet chamber 110, the inner case 200 is connected below the top wall of the outer case 100, an aeration chamber 210 is disposed in the inner case 200, and the lower end of the aeration chamber 210 is disposed in an open manner. The top wall of the outer casing 100 is provided with a first air outlet 130, the first air outlet 130 is communicated with the aeration chamber 210, the side wall of the inner casing 200 is provided with a second air inlet (not shown), and the second air inlet is communicated with the air inlet chamber 110 and the aeration chamber 210. The air distribution piece 300 is arranged in the air inlet chamber 110, the air distribution piece 300 is arranged at intervals with the top wall of the shell 100, an air distribution chamber 310 is arranged in the air distribution piece 300, and the lower end of the air distribution chamber 310 is arranged in an open mode. The top of the air distribution member 300 is provided with a third air inlet 320, the third air inlet 320 is communicated with the air distribution chamber 310 and the air inlet chamber 110, the height of the third air inlet 320 in the vertical direction is higher than that of the first air inlet 120, the side wall of the air distribution member 300 is provided with a second air outlet 330, and the second air outlet 330 is communicated with the air distribution chamber 310 and the second air outlet 330 of the second air inlet. The aeration assembly 400 is disposed in the aeration chamber 210, and the aeration assembly 400 is used to guide the gas discharged from the first gas outlet 130 to achieve aeration.

The air supply device pulses aeration into the air inlet chamber 110 through the first air inlet 120, gas extrudes sewage in the air inlet chamber 110 to move downwards, the gas enters the air distribution chamber 310 along the third air inlet 320 of the air distribution piece 300, enters the aeration chamber 210 through the second air outlet 330 and the second air inlet, and is guided by the aeration assembly 400 to discharge aeration from the first air outlet 130. When the air supply device stops aeration, the space above the first air inlet 120 in the vertical direction in the air inlet chamber 110 forms an air chamber, because the height of the third air inlet 320 in the vertical direction is higher than that of the first air inlet 120, sewage in the air inlet chamber 110 cannot overflow the third air inlet 320 of the air distribution piece 300, and further the air distribution chamber 310 above the second air outlet 330 in the air distribution piece 300 is always in a gas phase, so that the second air outlet 330 (corresponding to the air outlet connected with the pulse aeration chamber 210 in the air inlet chamber 110 in the background art) is prevented from being blocked due to the adhesion and deposition of activated sludge in the sludge-water mixture in the air distribution chamber 310.

The third air inlet 320 at the top of the air distribution member 300 has small aperture, the flow velocity of the purge air in the air inlet chamber 110 is low, the static pressure is high, and when the purge air enters the air distribution chamber 310 of the air distribution member 300 through the third air inlet 320 of the air distribution member 300, the flow velocity of the air flowing into the air distribution member 300 is obviously increased and the static pressure is reduced due to the resistance provided by the air distribution assembly. The pressure and flow rate of air in the air inlet chamber 110 are obviously different from those of air in the air distribution chamber 310, so that the resistance of air entering each air distribution member 300 (when a plurality of air distribution members 300 are arranged correspondingly when a plurality of air distribution chambers 210 are arranged, a plurality of air distribution members 300 work simultaneously) tends to be the same, the distribution of air in the air inlet chamber 110 is not obviously affected after each air distribution member 300 is discharged, the air inflow of each air distribution chamber 210 (when a plurality of air distribution chambers 210 are arranged, a plurality of air distribution chambers 210 work simultaneously) tends to be the same, the aeration is more uniform, and the smaller the aeration air flow is, the more uniform the aeration is.

Through the setting of air distribution piece 300, form the gas distribution resistance in air inlet chamber 110, the gas distribution resistance can make air inlet chamber 110 be full of air inlet chamber 110 upper end when admitting air, avoid activated sludge in the mud water mixture to deposit at air inlet chamber 110 and take place to block up, can make the gas velocity of flow in air distribution chamber 310 in air distribution piece 300 show and be greater than the gas velocity of flow in air inlet chamber 110 again, the second gas outlet 330 is erodeed to higher speed, alleviate the risk that second gas outlet 330 of air distribution piece 300 blocks up.

In some embodiments, referring to fig. 1,2,3,4 and 6, the sidewall of the air distribution member 300 is connected to the outer surface of the inner casing 200, and the second air outlet 330 is disposed on a side of the air distribution member 300 adjacent to the inner casing 200. The profile of the second air inlet is greater than or equal to that of the second air outlet 330, the second air outlet 330 is in a notch shape, the second air outlet 330 is formed by upwards sinking the bottom of the air distribution piece 300, and the length direction of the second air outlet 330 is in a vertical direction. The second air outlet 330 of the air distribution piece 300 is arranged near the bottom of the air inlet chamber 110, the length direction of the second air outlet 330 is vertical, the second air outlet 330 is arranged in a slender mode, the width of the second air outlet 330 is narrower, the air flow rate at the second air outlet 330 is high, and the second air outlet 330 is flushed by high-flow-rate air, so that the second air outlet 330 can be prevented from being blocked by activated sludge and impurities. The second air outlet 330 is notch-shaped, and the second air outlet 330 is formed by upwards sinking the bottom of the air distribution piece 300, so that the activated sludge and impurities can conveniently fall from the notch end of the second air outlet 330, and the second air outlet 330 is prevented from being blocked by the activated sludge and impurities.

In some embodiments, referring to fig. 1,2, 3, 4 and 5, the aeration assembly 400 includes an aeration tube 410, the aeration tube 410 is located in the aeration chamber 210, an aeration channel 411 is disposed in the aeration tube 410, the aeration channel 411 communicates with the first air outlet 130 and the aeration chamber 210, and an upper end of the aeration tube 410 is connected below a top wall of the housing 100.

In some embodiments, referring to fig. 1, 5 and 7, the aeration channel 411 includes a gas collection portion 4111, a resistance portion 4112 and an aeration portion 4113, where the gas collection portion 4111, the resistance portion 4112 and the aeration portion 4113 are in sequential communication from bottom to top. The inner diameter of the gas collection portion 4111 is larger than the inner diameter of the aeration portion 4113, and the cross-sectional inner diameter of the resistance portion 4112 gradually decreases in the upward direction. And the interconnecting parts of the gas collecting part 4111, the resistance part 4112 and the aeration part 4113 are rounded. The inner diameter of the cross section of the resistance portion 4112 gradually decreases in the upward direction, the resistance portion 4112 is provided in a slope, and bubbles can be conveniently moved to the aeration portion 4113 along the resistance portion 4112, so that air accumulation can be prevented.

The schematic diagram of the principle of the change of the air-hydraulic pressure difference when the aeration assembly 400 of the prior art is aerated is shown in fig. 8, when the air of the aeration chamber 210 is continuously accumulated, the mud-water mixture in the drainage cup 420 is discharged through the drainage hole at the bottom of the drainage cup 420; when the gas-liquid interface is level with the bottom of the aeration pipe 410, the pressure of the aeration air flow at the gas-liquid interface outside the aeration pipe 410 is balanced with the upward pressure pewter of the mud-water mixture, i.e., pewter=pewter; when the balance is further broken by aeration, the aeration gas enters the aeration pipe 410 in a discontinuous bubble flow, and the bubbles entering the aeration pipe 410 are subjected to 3 acting forces in the vertical direction; the downward atmosphere is pressurized into Patmosphere, the upward buoyancy Pfloat of the air bubble, the bottom of the air bubble receives upward pressure minus the upward pressure Pwater difference which is integrally expressed by the downward pressure of the top of the air bubble; ideally, the bubble volume is unchanged, the Pwater difference is unchanged and related to the bubble diameter, wherein the sum Pwater difference+Pfloat of upward acting force is far greater than the downward pressure Patmosphere, the pressure inside the bubble is greater than the pressure of external water when the bubble moves upwards, the bubble has the potential of upward rapid movement and volume expansion, the bubble moves upwards rapidly and is discharged from an aeration port, and the aeration pipe 410 has no regulation effect on the pulse aeration frequency.

The schematic diagram of the change principle of the air-hydraulic pressure difference when the aeration assembly 400 of the pulse aeration generating device in the embodiment of the invention is aerated is shown in fig. 9, the diameter of the bottom of the aeration pipe 410 (the gas collecting part 4111) is larger, the diameter of the top (the aeration part 4113) is smaller, when the air-liquid interface is level with the bottom of the aeration pipe 410, the air-liquid interface is the same as the non-resistance aeration pipe 410, and the P aeration=p water at the air-liquid interface outside the aeration pipe 410; however, the diameter of the aeration pipe 410 is reduced from bottom to top, when the bubbles move to the reducing surface (the resistance portion 4112), downward force is not only influenced by the atmospheric pressure PHOGH, but also influenced by downward pressure of the reducing surface of the aeration pipe 410 on the bubbles and resultant force PHOH of downward resistance of the reducing surface of the aeration pipe 410 on the gas and the liquid, and the trend of expansion and upward movement of the bubbles in the aeration pipe 410 is delayed by increasing the downward resistance PHOH, so that the period of bubble aeration is further delayed, the aeration period is prolonged, the aeration frequency of the large bubbles of pulse aeration is reduced, and the effect of aeration strength is improved.

The pulse aeration generating device of the embodiment of the invention is provided with the resistance aeration pipe 410, and the resistance is additionally increased through the aeration pipe 410 to slow down the release of large bubbles in the aeration pipe 410, so as to achieve the effects of adjusting and prolonging the pulse aeration period of the large bubbles, reducing the pulse aeration frequency and improving the aeration intensity, and the resistance aeration design is prolonged by 20-40% under the same aeration flow.

In some embodiments, referring to fig. 1, 5 and 7, the aerator pipe 410 includes a sleeve 412 and a resistance block 413, wherein an upper end of the sleeve 412 is connected below a top wall of the housing 100, the resistance block 413 is disposed at an end of the sleeve 412 near the first air outlet 130, and the resistance block 413 is in sealing connection with an inner wall of the sleeve 412. The resistance block 413 is provided with a through hole, the through hole is communicated with the first air outlet 130 and the inside of the sleeve 412, and the lower end of the through hole is in a chamfer setting. The portion of the sleeve 412 located below the resistance block 413 forms a gas collection portion 4111, the chamfer portion of the through hole forms a resistance portion 4112, and the portion of the through hole located above the chamfer portion of the through hole forms an aeration portion 4113.

The resistance block 413 and the sleeve 412 may be integrally formed with the housing 100, or the sleeve 412 may be integrally formed with the housing 100, and the resistance block 413 may be embedded in the sleeve 412. By arranging the resistance blocks 413 and the sleeves 412, the reducing structure of the aeration channel 411 is realized, and the reducing structure of the aeration channel 411 can prevent the bubbles from expanding and moving upwards due to the additional downward pressure on the bubbles, so that the air bubbles are delayed to be flushed out of the pulse aeration pipe 410, namely, the pulse aeration period is prolonged.

In some embodiments, referring to fig. 1,2 and 4, the aeration assembly 400 further includes a drain cup 420, the drain cup 420 is located in the aeration chamber 210, a drain chamber 421 is disposed in the drain cup 420, an upper end of the drain chamber 421 is disposed in an open manner, the drain cup 420 is disposed at a distance from a top wall of the housing 100, and a lower end of the aeration tube 410 extends into the drain chamber 421. By providing the drain cup 420, it is ensured that bubbles will enter the drain chamber 421 along the outer side of the drain cup 420 after entering the aeration chamber 210 along the second air inlet, and then enter the aeration channel 411, thereby prolonging the aeration path, i.e. the pulse aeration period.

In some embodiments, referring to fig. 1,2 and 4, a drain 422 is provided on the bottom wall of the drain cup 420, the drain 422 communicating with the drain chamber 421 and the aeration chamber 210. After the air enters the aeration chamber 210, the air is continuously converged at the top of the pulse aeration chamber 210 and continuously discharges the mud-water mixture of the pulse aeration chamber 210 downwards from top to bottom, when the air reaches the bottom of the pulse aeration pipe 410, the air in the pulse aeration chamber 210 is discharged from the pulse aeration pipe 410 in the form of large pulse bubbles, when the air is instantaneously discharged from the pulse aeration pipe 410, the air volume in the pulse aeration chamber 210 is instantaneously reduced, the mud-water mixture in the membrane pool enters the drain cup 420 from the drain outlet 422 of the drain cup 420 and floods the bottom of the aeration pipe 410, the pulse aeration chamber 210 stops pulse aeration and performs the air collecting process of the next period, and when the air collecting reaches the bottom of the pulse aeration pipe 410, the air is discharged from the aeration pipe 410 in the form of large pulse bubbles again and is circulated.

In some embodiments, referring to fig. 1, 2 and 11, the intake chamber 110 is disposed around the inner housing 200. The air inlet chamber 110 is arranged in a ring shape, and has better effect compared with the single-side annular air inlet chamber 110 in the prior art.

As shown in fig. 10, in the conventional pulse aeration device, a single gallery (air inlet chamber 110) is generally used for air distribution, after aeration air enters the air inlet chamber 110 from an air inlet, the gas flow cross section is significantly increased, the gas flow speed is reduced, the aeration air sequentially flows through three pulse aeration chambers 210, the aeration air respectively enters the pulse aeration chambers 210 from air outlets of the air inlet chamber 110 connected with the pulse aeration chambers 210, the air distribution mode has the advantages that the air inlet flow rate of the pulse aeration chambers 210 close to the first air inlet 120 of the air inlet chamber 110 is large, the air inlet amount of the pulse aeration chambers 210 far from the first air inlet 120 of the air inlet chamber 110 is small, that is, the aeration amount of the 3 pulse aeration chambers 210 is sequentially reduced, and the smaller the aeration air flow rate is, the aeration amount difference of the 3 pulse aeration chambers 210 is larger, and the ultra-filtration membrane group device can purge unevenly and locally accumulate mud.

The schematic diagram of aeration and gas distribution of the pulse aeration generating device in the embodiment of the invention is shown in fig. 11, and by arranging the annular air inlet chamber 110 and matching with the arrangement of the gas distribution piece 300, a relatively stable gas chamber can be constructed at the top of the gas distribution piece 300. The aperture of the air inlet at the top of the air distribution piece 300 is small, the flow velocity of the sweeping air in the annular air distribution gallery is low, the static pressure is high, and when the sweeping air enters the cavity of the air distribution piece 300 through the air inlet of the air distribution piece 300, the flow velocity of the air flowing into the air distribution piece 300 is obviously increased due to the resistance provided by the air distribution piece 300, and the static pressure is reduced. The pressure and flow rate of air in the air inlet chamber 110 are obviously different from those of air in the air distribution chamber 310, so that the resistance of air entering each air distribution member 300 (when a plurality of air distribution members 300 are arranged correspondingly when a plurality of air distribution chambers 210 are arranged, a plurality of air distribution members 300 work simultaneously) tends to be the same, the distribution of air in the air inlet chamber 110 is not obviously affected after each air distribution member 300 is discharged, the air inflow of each air distribution chamber 210 (when a plurality of air distribution chambers 210 are arranged, a plurality of air distribution chambers 210 work simultaneously) tends to be the same, the aeration is more uniform, and the smaller the aeration air flow is, the more uniform the aeration is.

In some embodiments, referring to fig. 1, 4 and 12, the pulse aeration generating apparatus further includes a gas distribution cap 500, and the gas distribution cap 500 is connected to the first gas outlet 130 above the housing 100. The inside of the air distribution cap 500 is provided with an air distribution chamber 510, the lower end of the air distribution cap 500 is provided with a fourth air inlet 520, and the fourth air inlet 520 is communicated with the first air outlet 130 and the air distribution chamber 510. The sidewall of the air distribution cap 500 is provided with a plurality of third air outlets 530, and the third air outlets 530 are communicated with the air distribution chamber 510. A flow guide partition plate 540 is provided in the gas separation cap 500, and the flow guide partition plate 540 is used to guide the gas to be discharged from the plurality of third gas outlets 530. The air distribution cap 500 can prevent sludge from falling into the pulse aeration pipe 410 to block the drain cup 420, and divide aeration bubbles into two large bubbles in different directions, so that disturbance points of the aeration bubbles on membrane wires are increased, and a better membrane wire cleaning effect is achieved.

In some embodiments, referring to fig. 1 and 2, an air inlet pipe 140 is connected to the housing 100, an air inlet channel is disposed in the air inlet pipe 140, the air inlet channel communicates with the first air inlet 120, and the air inlet pipe 140 is used for externally connecting air supply equipment. The air inlet pipe 140 is arranged at one end of the shell 100 along the length direction of the shell 100, the other end of the shell 100 along the length direction of the shell 100 is provided with a supporting rod 150, the shell 100 of the pulse aeration generating device is a cuboid box with an open bottom, the air inlet pipe 140 can be inserted into an aeration pipe 410 of the immersed membrane module device, and the supporting rod 150 is fixed on a frame of the immersed membrane module device to the shell 100.

In some embodiments, referring to fig. 1 and 2, the pulse aeration generating device of the embodiment of the present invention is provided with a plurality of pulse aeration chambers 210, and the plurality of pulse aeration chambers 210 generate large bubble pulse aeration in turn, so that efficient oscillation of membrane filaments at different positions on the membrane is realized with the minimum aeration amount, and energy saving is maximized.

In some embodiments, referring to fig. 1 and 2, the requirements of different immersed ultrafiltration membranes on pulse aeration flow and pulse aeration period can be adapted by adjusting the size of the second air inlet at the top of the air distribution member 300, the height of the second air outlet 330 of the air distribution member 300, the size of the drain cup 420 and the aeration tube 410.

In some embodiments, referring to fig. 1, 2 and 4, the submerged ultrafiltration membrane module is a membrane module applied to the municipal sewage field, membrane wires of the membrane module are made of PVDF, the forming process is a NIPS process, the required blowing aeration air volume is small, and the blowing aeration air volume of an MBR membrane module device corresponding to the aeration device is 2.2m ³/h.

At this time, the pulse aeration generating device is provided with 3 independent pulse aeration chambers 210, 6 air distribution pieces 300 are arranged in the aeration gallery, each pulse aeration chamber 210 corresponds to 2 air distribution pieces 300, the diameter of an air inlet at the top of each air distribution piece 300 is 5.5mm, the width of an air outlet at the bottom is 8mm, the height is 20mm, the diameter of a drain cup 420 in each pulse aeration chamber 210 is 10cm, the diameter of a pulse aeration pipe 410 is 20mm, and the diameter of a drain outlet 422 at the bottom of each drain cup 420 is 8mm. Under the condition of the design parameters, the pulse aeration period of large bubbles generated by 3 aeration outlets is 3.75 s/pulse, namely, after the purge aeration passes through the non-blocking high-resistance pulse aeration generating device, the continuous aeration is converted into pulse aeration with higher flushing strength, the interval between the two bubbles of pulse aeration is 3.75s, the gas distribution gallery is fully filled with gas, the gas-liquid interface is arranged at the lower part of the gas distribution part 300, the risk of sludge is effectively reduced, and the longer pulse aeration time interval of the embodiment meets the flushing requirement of an NIPS process ultrafiltration membrane and is more energy-saving.

In some embodiments, referring to fig. 1, fig. 2 and fig. 4, the submerged ultrafiltration membrane module is a membrane module applied to the field of industrial sewage, membrane filaments of the membrane module are made of PVDF, the forming process is a TIPS process, the required blowing aeration air volume is large, and the blowing aeration air volume of an MBR membrane module device corresponding to the aeration device is 3.5m ³/h.

At this time, the pulse aeration generating device is provided with 3 independent pulse aeration chambers 210, 6 air distribution pieces 300 are arranged in the aeration gallery, each pulse aeration chamber 210 corresponds to 2 air distribution pieces 300, the diameter of the air inlet at the top of each air distribution piece 300 is 7mm, the width of the air outlet at the bottom is 10mm, the height is 35mm, the diameter of the drain cup 420 in the pulse aeration chamber 210 is 12cm, the diameter of the pulse aeration pipe 410 is 20mm, and the diameter of the drain outlet 422 at the bottom of the drain cup 420 is 10mm. Under the condition of the design parameters, the pulse aeration period of large bubbles generated by 3 aeration outlets is 2.8 s/number, namely, after the purge aeration passes through a non-blocking large-resistance pulse aeration generating device, continuous aeration is converted into pulse aeration with higher flushing strength, the interval between two bubbles of pulse aeration is 2.8s, the gas distribution gallery is fully filled with gas, the gas-liquid interface is arranged at the lower part of the gas distribution part 300, the risk of sludge accumulation is effectively reduced, and the embodiment realizes the adjustment of the pulse period by adjusting part of structural parameters, thereby adapting to the aeration purge requirements of immersed ultrafiltration membranes with different working conditions and different materials.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A pulse aeration generating apparatus, comprising:

the shell is internally provided with an air inlet cavity with an open lower end, and the side wall of the shell is provided with a first air inlet which is communicated with the air inlet cavity and is externally connected with air supply equipment;

The inner shell is arranged in the air inlet chamber, the inner shell is connected below the top wall of the outer shell, an aeration chamber with an open lower end is arranged in the inner shell, a first air outlet communicated with the aeration chamber is arranged on the top wall of the outer shell, and a second air inlet communicated with the air inlet chamber and the aeration chamber is arranged on the side wall of the inner shell;

The air distribution piece is arranged in the air inlet chamber, the air distribution piece and the top wall of the shell are arranged at intervals, an air distribution chamber with an open lower end is arranged in the air distribution piece, a third air inlet which is communicated with the air distribution chamber and the air inlet chamber is arranged at the top of the air distribution piece, the height of the third air inlet in the vertical direction is higher than that of the first air inlet, and a second air outlet which is communicated with the air distribution chamber and the second air inlet is arranged on the side wall of the air distribution piece;

the aeration component is arranged in the aeration chamber and is used for guiding gas to be discharged from the first gas outlet so as to realize aeration.

2. The pulse aeration generating device according to claim 1, wherein the side wall of the air distribution member is connected to the outer surface of the inner shell, the second air outlet is located at one side of the air distribution member close to the inner shell, the outline of the second air inlet is larger than or equal to that of the second air outlet, the second air outlet is in a notch shape, the bottom of the air distribution member is recessed upwards to form the second air outlet, and the length direction of the second air outlet is vertical.

3. The pulse aeration generating device according to claim 1, wherein the aeration assembly comprises an aeration pipe, the aeration pipe is located in the aeration chamber, an aeration channel communicated with the first air outlet and the aeration chamber is arranged in the aeration pipe, and the upper end of the aeration pipe is connected below the top wall of the housing.

4. A pulse aeration generating device according to claim 3, wherein the aeration channel comprises a gas collecting portion, a resistance portion and an aeration portion which are communicated in this order from bottom to top, the inner diameter of the gas collecting portion is larger than the inner diameter of the aeration portion, and the inner diameter of the cross section of the resistance portion is gradually reduced in an upward direction.

5. The pulse aeration generating device according to claim 4, wherein the aeration pipe comprises a sleeve and a resistance block, the upper end of the sleeve is connected below the top wall of the housing, the resistance block is arranged at one end, close to the first air outlet, of the sleeve, the resistance block is in sealing connection with the inner wall of the sleeve, a through hole which is communicated with the first air outlet and the interior of the sleeve is arranged on the resistance block, the lower end of the through hole is in a chamfer setting, a part, located below the resistance block, of the sleeve forms the air collecting part, a chamfer part of the through hole forms the resistance part, and a part, located above the chamfer part of the through hole, of the through hole forms the aeration part.

6. A pulse aeration generating device according to claim 3, wherein the aeration assembly further comprises a drain cup, the drain cup is located in the aeration chamber, a drain chamber with an open upper end is arranged in the drain cup, the drain cup is arranged at a distance from the top wall of the housing, and the lower end of the aeration pipe extends into the drain chamber.

7. The pulse aeration generator according to claim 6, wherein a drain port communicating the drain chamber and the aeration chamber is provided in a bottom wall of the drain cup.

8. The pulse aeration generator of claim 1, wherein the air intake chamber is disposed around the inner housing.

9. The pulse aeration generating device according to claim 1, further comprising a gas dividing cap connected to the first gas outlet position above the housing, a gas dividing chamber provided in the gas dividing cap, a fourth gas inlet communicating the first gas outlet with the gas dividing chamber provided at a lower end of the gas dividing cap, a plurality of third gas outlets communicating the gas dividing chamber provided on a side wall of the gas dividing cap, and a flow guiding partition plate provided in the gas dividing cap for guiding gas to be discharged from the plurality of third gas outlets.

10. The pulse aeration generating device according to claim 1, wherein an air inlet pipe is connected to the housing, an air inlet channel communicating with the first air inlet is provided in the air inlet pipe, and the air inlet pipe is used for externally connecting air supply equipment.