Porous blade for dispersing gas and stirrer

Abstract

The utility model discloses a porous blade for dispersing gas and a stirrer, a plurality of gas outlet holes are formed in the porous blade, and the diameters of the gas outlet holes are sequentially increased from near to far according to the distance from the gas outlet holes to the rotating axis of the porous blade. The stirrer comprises the porous blade. The air distributor has the beneficial effects that on the basis of the structure of a traditional stirrer, the air outlet holes are formed in the blades to form the porous blades, and air distribution is realized by ventilating the porous blades, so that the functions of a traditional air distributor can be integrated on the stirrer; therefore, the equipment structure of the stirring process can be simplified, and the air dispersion efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of stirring technology, and in particular to a porous blade and a stirrer for dispersing gas. Background Art

[0002] In the traditional aeration and stirring process, an air distributor is usually required to achieve effective gas dispersion. The traditional air distributor is usually installed at the bottom of the stirring tank, with the nozzle facing the center of the bottom of the fermentation tank and maintaining a suitable distance from the bottom of the tank. The high-speed airflow passes through the bottom of the tank to recoil and disperse the air well. The dispersed rising bubbles are further broken into small bubbles by the agitator to achieve the purpose of fully mixing with the fermentation liquid. However, the traditional air distributor has certain limitations, such as complex structure, difficult installation and maintenance, and low gas dispersion rate. Utility Model Content

[0003] One of the objects of the present application is to provide a porous blade for dispersing gas that can solve at least one of the defects in the above-mentioned background technology.

[0004] Another object of the present application is to provide a stirrer for dispersing gas that can solve at least one of the defects in the above-mentioned background technology.

[0005] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a porous blade for dispersing gas, wherein a plurality of air outlet holes are arranged on the porous blade, and the diameters of the air outlet holes increase from near to far according to the distance to the rotation axis of the porous blade.

[0006] Preferably, the plurality of air outlet holes are divided into a plurality of groups, and the air outlet holes in each group are arranged at intervals along the rotation axis direction of the porous blade; and the plurality of air outlet holes in each group are arranged in a direction perpendicular to the rotation axis direction of the porous blade.

[0007] Preferably, the spacing between two adjacent air outlet holes in each group increases sequentially from near to far according to the distance to the rotation axis of the porous blade.

[0008] Preferably, the opening direction of the air outlet is opposite to the rotation direction of the porous blades.

[0009] Preferably, an air inlet and multiple air paths connected to the air inlet are provided in the porous blade; the air inlet is located on the side of the porous blade close to the rotation axis, the air inlet is used to connect with an external air source, and the air path corresponds to all the air outlet holes in each group.

[0010] Preferably, the spacing between the air outlets is S, and the distance between the air outlets and the air inlet is L; except for the air outlet closest to the air inlet, the diameters of the remaining air outlets are d∝(S / L)^(1 / 5).

[0011] Preferably, the porous blades are manufactured using metal powder 3D printing technology.

[0012] A stirrer for dispersing gas comprises a stirring shaft and the above-mentioned porous blade; the porous blade is installed on one side of the stirring shaft, and the stirring shaft is connected with the air outlet hole of the porous blade through a centrally arranged air vent, so that air enters the porous blade through the air vent and flows out along the air outlet, thereby distributing air when the porous blade rotates with the stirring shaft.

[0013] Preferably, a ventilation pipe is radially extended on the side of the stirring shaft, and the porous blades are connected to the stirring shaft through the ventilation pipe; the sum of the areas of all the air outlet holes on the porous blades is less than or equal to the cross-sectional area of ​​the air inlet hole arranged in the center of the ventilation pipe.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] Based on the structure of a traditional agitator, air outlet holes are opened on the blades to form porous blades. Air distribution is achieved by ventilating the porous blades, so that the function of the traditional air distributor can be integrated into the agitator, thereby simplifying the equipment structure of the mixing process and improving the efficiency of air dispersion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the agitator used for gas dispersion in this application.

[0017] Figure 2 For this application Figure 1 Schematic diagram of the local structure of the porous blade.

[0018] Figure 3 This is a schematic diagram of the state of the agitator when rotating and stirring in this application.

[0019] In the figure: a stirrer 1, a stirring shaft 11, an air vent 110, a porous blade 12, an air outlet 120, an air path 121, an air inlet 122, a vent pipe 13, and an air inlet 130. DETAILED DESCRIPTION

[0020] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0021] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0022] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0026] One aspect of the present application provides a porous blade 12 for dispersing gas, such as Figure 1 and Figure 2 As shown, in one preferred embodiment, a plurality of air outlet holes 120 are provided on the porous blade 12, and the diameters of the air outlet holes 120 increase sequentially from near to far according to the distance to the rotation axis of the porous blade 12.

[0027] It can be understood that in this embodiment, the porous blade 12 is formed by providing the air outlet holes 120 on the traditional blade, so that the function of the traditional air distributor is integrated on the porous blade 12. Therefore, during the normal operation of the porous blade 12 for rotating and stirring, it is only necessary to introduce air into the porous blade 12, and the gas can be discharged from the air outlet holes 120.

[0028] Specifically, based on the technical solution of the present application, on the one hand, the gas to be dispersed has been arranged relatively evenly at various positions of the tank body (not shown) through the distribution structure of the porous blades 12, so that each spatial area of ​​the tank body can be exposed to an equal amount of air; on the other hand, the distance between the gas to be dispersed and the porous blades 12 can be regarded as zero distance, that is, the gas can be dispersed by contacting the porous blades 12 after being discharged from the air outlet 120; and the vortex disturbance near the porous blades 12 is relatively large, which can quickly disperse the dispersed air to further improve efficiency.

[0029] It can be understood that the size of the air outlet 120 is relatively small relative to the structural size of the porous blade 12, and it is often necessary to set up a plurality of air outlets 120; and in order to ensure that the air discharged from the air outlet 120 is relatively uniform, it is necessary to arrange these air outlets 120 in an array, that is, they can be divided into at least one column and at least one row along the direction parallel to the rotation axis of the porous blade 12 and perpendicular to the rotation axis. Generally speaking, the air outlet 120 can be arranged in an array of multiple rows and columns; wherein the multiple columns of air outlets 120 in each row can be regarded as a group, so that multiple groups of air outlets 120 spaced apart along the rotation axis direction of the porous blade 12 can be obtained. The specific number of groups of air outlets 120 required to be arranged and the specific number of air outlets 120 required for each group can be designed according to actual needs, and the specific design process will be described in detail in the subsequent content.

[0030] It should be known that the air pressure entering the porous blade 12 from the vent hole 110 flows through the multiple air outlets 120 of each group in sequence, so the gas flow rate corresponding to the more backward the air outlet 120 is, the lower it is. If the diameters of the multiple air outlets 120 in each group are the same, the air volume of the later air outlets 120, that is, the air outlets 120 far away from the stirring shaft 11, may be less, thereby affecting the uniform dispersion effect of the gas. Therefore, in this embodiment, the diameter size can be changed according to the distance from the air outlet 120 to the stirring shaft 11, so as to ensure that the air volume discharged by the multiple air outlets 120 in each group is the same or similar.

[0031] It should be noted that the spacing between two adjacent air outlets 120 in each group can be kept consistent. However, from the above analysis results, it can be seen that the larger the diameter of the air outlet 120, the stronger the dispersion of the air flow that can be discharged, and the larger the dispersion area formed when the discharged gas is dispersed, which may cause it to overlap with the dispersion area formed by the adjacent air outlet 120, thereby affecting the dispersion effect of the bubbles. Therefore, for the spacing between two adjacent air outlets 120 in each group, it is preferred that it can be increased from near to far according to the distance to the stirring shaft 11. That is, the farther the air outlet 120 is from the stirring shaft 11, the larger the spacing between it and the previous adjacent air outlet 120.

[0032] In this embodiment, Figure 3 As shown, the opening direction of the air outlet 120 is opposite to the rotation direction of the porous blade 12. In this way, the energy loss of the stirrer 1 can be reduced while the bubbles are dispersed.

[0033] It is understandable that Figure 3 For example, assuming that the stirring direction of the stirrer is counterclockwise, that is, Figure 3 The dotted arrow in the middle indicates the direction in which the air outlet holes 120 on the porous blade 12 are discharged in a clockwise direction, that is, Figure 3 The solid arrow in the middle indicates the direction. It should be known to those skilled in the art that, during the rotation of the agitator 1, the vortex disturbance generated by the porous blades 12 is located behind the rotation direction, so the outlet direction of the air outlet 120 is designed to be opposite to the rotation direction of the porous blades 12, which can ensure that the gas discharged from the air outlet 120 is instantly in contact with the vortex disturbance generated by the porous blades 12 and is broken up to form tiny bubbles. At the same time, the air outlet 120 discharges gas in the opposite direction of the rotation of the porous blades 12, which can provide assistance to the rotation of the porous blades 12, so as to reduce the driving force required for the normal stirring rotation of the agitator 1, thereby reducing energy loss and achieving cost savings.

[0034] In this embodiment, Figure 1 and Figure 2 As shown, an axially extending air inlet 122 is provided on one side of the porous blade 12 close to the stirring shaft 11, and the multiple groups of air outlet holes 120 are connected to the air vents 110 of the stirring shaft 11 through the air inlet 122. Specifically, a plurality of air paths 121 corresponding to each group of air outlet holes 120 are provided in the porous blade 12, and one end of each air path 121 is connected to the air inlet 122, so that the air introduced from the stirring shaft 11 can flow to each air path 121 after entering the air inlet 122, until it is discharged from the air outlet holes 120 corresponding to each air path 121.

[0035] In this embodiment, based on the flow characteristics of the airflow, the exhaust performance of each air outlet 120 will be affected by the air inlet 122. Specifically, the spacing between the air outlets 120 can be set to S, and the distance between the air outlet 120 and the air inlet 122 can be set to L; except for the air outlet 120 closest to the air inlet 122, the diameters d of the remaining air outlets 120 are ∝ (S / L)^(1 / 5). For ease of understanding, the specific relationship between the diameter d of the air outlet 120, the spacing between the air outlets 120, S, and the distance between the air outlet 120 and the air inlet 122, L, will be described in detail below.

[0036] Those skilled in the art should know that the pressure loss of a fluid in a pipeline is often calculated using the Hezen-Williams formula, and the specific calculation formula is as follows:

[0037] h = [10.66 × L × Q 1.852 ] / [C 1.852 ×d 4.87 ].

[0038] Wherein, h represents the head loss, L represents the pipe length, that is, the distance from the air outlet 120 to the air inlet 122 in this embodiment; Q represents the average flow rate, and C represents a constant, which is related to the surface roughness of the pipe.

[0039] From the above content, it can be known that for each group of multiple outlet holes 120, in order to ensure uniform dispersion of bubbles, it is necessary to ensure that the multiple outlet holes 120 in each group have nearly the same flow rate. Then any two adjacent outlet holes 120 can be selected, and the corresponding diameters of the two are d i+1 and d i ; then the diameter d i+1 and d i The corresponding head loss h i+1 and h i They are:

[0040] h i =[10.66×L i ×Q 1.852 ] / [C 1.852 ×d i 4.87 ].

[0041] h i+1 =[10.66×(L i +S)×Q 1.852 ] / [C 1.852 ×d 4.87 ].

[0042] Where Li represents the diameter d i The distance from the corresponding air outlet 120 to the air inlet 122; S represents the diameter d i+1 and d i The distance between two corresponding air outlet holes 120 .

[0043] To obtain the same flow rate, the same head loss is required, that is, h i = h i+1 , the corresponding iterative relationship can be obtained by combining:

[0044] .

[0045] In a rough calculation, we can take ; That is, the diameter d of the air outlet 120 is proportional to (S / L)^(1 / 5).

[0046] In this embodiment, it can be seen from the above content that the porous blade 12 is provided with an air path 121, an air inlet 122 and a plurality of air outlets 120, which will lead to a complicated internal structure of the porous blade 12, and the traditional casting method is basically unable to realize the production of the porous blade 12. Therefore, in this embodiment, the porous blade 12 can be produced by metal powder 3D printing technology. The metal powder material used when the porous blade 12 is produced by metal powder 3D printing technology can be selected according to the specific working conditions required by the porous blade 12, for example, stainless steel powder can be used.

[0047] Another aspect of the present application provides a stirrer 1 for dispersing gas, such as Figures 1 to 3 As shown, it includes a stirring shaft 11 and the above-mentioned porous blades 12; the porous blades 12 are installed on one side of the stirring shaft 11, and the stirring shaft 11 is connected with the air outlet 120 of the porous blades 12 through the air vent 110 arranged in the center, so that air can enter the porous blades 12 through the air vent 110 and flow out along the air outlet 120, and then the air is distributed in the process that the porous blades 12 rotate with the stirring shaft 11.

[0048] It can be understood that, based on the structure of a traditional agitator, the present application provides air outlet holes 120 on the blades to form porous blades 12, and air distribution is achieved by ventilating the porous blades 12, so that the function of the traditional air distributor can be integrated into the agitator 1, thereby simplifying the equipment structure of the existing mixing process and improving the efficiency of air dispersion.

[0049] Specifically, the traditional air distributor is mainly arranged at the bottom of the tank, and there is a certain distance between the air distributor and the traditional agitator. When the traditional air distributor and the traditional agitator are working, the air distributor can spray air upward to form bubbles that float upward; at this time, the traditional agitator can form a vortex field by stirring the fluid in the tank, and the vortex field may change the path of the bubbles floating upward, so that the bubbles are concentrated at a certain local position of the blades and dispersed, which will lead to a decrease in the air dispersion efficiency.

[0050] In this embodiment, the porous blade 12 is formed by opening an air outlet 120 on the traditional blade, so that the function of the traditional air distributor is integrated into the agitator 1. Therefore, during the normal operation of the agitator 1, it is only necessary to pass air into the air vent 110 of the agitator shaft 11, and the gas can enter the porous blade 12 along the air vent 110 and be discharged from the air outlet 120. Based on the technical solution of the present application, on the one hand, the gas to be dispersed has been arranged relatively evenly at various positions of the tank body through the distribution structure of the porous blade 12, so that each space area of ​​the tank body can be exposed to an equal amount of air; on the other hand, the distance between the gas to be dispersed and the porous blade 12 can be regarded as zero distance, that is, the gas can be dispersed by contacting the porous blade 12 after being discharged from the air outlet 120; and the vortex disturbance near the porous blade 12 is relatively large, and the air that can be dispersed can be quickly dispersed to further improve the efficiency.

[0051] In this embodiment, Figure 1As shown, the porous blades 12 and the stirring shaft 11 generally adopt a split structure, that is, the stirring shaft 11 and the porous blades 12 are detachably and tightly fixedly connected. In order to facilitate the installation between the porous blades 12 and the stirring shaft 11, a vent pipe 13 can be installed along the radial extension of the side of the stirring shaft 11; the porous blades 12 are connected to the stirring shaft 11 through the vent pipe 13. It should be noted that in order to ensure the stability of the exhaust volume of the air outlet holes 120, it is necessary to ensure that the total area of ​​all the air outlet holes 120 on the porous blades 12 is less than or equal to the cross-sectional area of ​​the air inlet hole 130 set in the center of the vent pipe 13.

[0052] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A porous blade for dispersing gas, characterized in that: The porous blade is provided with a plurality of air outlet holes, and the diameters of the air outlet holes increase sequentially from near to far according to the distance from the rotation axis of the porous blade.

2. The porous blade for dispersing gas according to claim 1, characterized in that: The plurality of air outlet holes are divided into a plurality of groups, and the air outlet holes in each group are arranged at intervals along the rotation axis direction of the porous blade; The plurality of air outlet holes in each group are arranged in a direction perpendicular to the rotation axis of the porous blades.

3. The porous blade for dispersing gas according to claim 2, characterized in that: The distance between two adjacent air outlet holes in each group increases from near to far according to the distance to the rotation axis of the porous blade.

4. The porous blade for dispersing gas according to claim 1, characterized in that: The opening direction of the air outlet is opposite to the rotation direction of the porous blades.

5. The porous blade for dispersing gas according to any one of claims 2 to 4, characterized in that: The porous blades are provided with an air inlet and a plurality of air paths connected to the air inlet; The air inlet is located on a side of the porous blade close to the rotation axis, and the air inlet is used to communicate with an external air source. The air path corresponds to all the air outlets in each group.

6. The porous blade for dispersing gas according to claim 5, characterized in that The spacing between the air outlet holes is S, and the distance between the air outlet holes and the air inlet is L; except for the air outlet hole closest to the air inlet, the diameters of the other air outlet holes are d∝(S / L)^(1 / 5).

7. The porous blade for dispersing gas according to claim 1, characterized in that: The porous blades are manufactured using metal powder 3D printing technology.

8. A stirrer for dispersing gas, characterized in that: It comprises a stirring shaft and the porous blade according to any one of claims 1 to 7; the porous blade is installed on one side of the stirring shaft, and the stirring shaft is connected with the air outlet hole of the porous blade through a centrally arranged air vent, so that air enters the porous blade through the air vent and flows out along the air outlet, thereby distributing air as the porous blade rotates with the stirring shaft.

9. The agitator for dispersing gas according to claim 8, characterized in that: A ventilation pipe is radially extended from the side of the stirring shaft, and the porous blades are connected to the stirring shaft through the ventilation pipe; the total area of ​​all the air outlet holes on the porous blades is less than or equal to the cross-sectional area of ​​the air inlet hole arranged at the center of the ventilation pipe.

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