Wastewater treatment device for potassium perchlorate preparation

Abstract

The invention relates to the technical field of potassium perchlorate wastewater treatment, and discloses a wastewater treatment device for potassium perchlorate preparation, which comprises a pool body for treating wastewater, a plurality of aeration frames mounted at the bottom of the pool body, aeration pipelines mounted in the aeration frames, and a membrane treatment unit mounted at the top of the aeration frames, the membrane treatment unit comprises a membrane frame and a membrane group which is arranged in the membrane frame and consists of a plurality of membranes; a steel shaft body is installed in the aeration frame, a plurality of first spiral blades and second spiral blades are arranged on the steel shaft body, and the first spiral blades and the second spiral blades are connected with the steel shaft body through detachable sleeves. The first spiral blade and the second spiral blade rotate through bubbles generated by aeration, and the first spiral blade and the second spiral blade are arranged in a staggered mode and are designed to be different in diameter, so that the bubbles can be more effectively cut and stirred in the rotating process of the first spiral blade and the second spiral blade.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of potassium perchlorate wastewater treatment, in particular to a wastewater treatment device for potassium perchlorate preparation. BACKGROUND

[0002] In the industrial production process of potassium perchlorate, wastewater treatment constitutes a crucial environmental management link in the entire production process chain. The preparation wastewater is usually complex in physical and chemical properties, contains chlorides with a concentration of 20,000-50,000 mg / L, and is accompanied by a large amount of incompletely reacted organic intermediates, catalyst residues and various inorganic salt impurities that may form crystals. The commonly used potassium perchlorate wastewater treatment technologies in the industry mainly include chemical precipitation, oxidation-reduction, membrane separation, etc. Among them, the membrane bioreactor (MBR) technology is favored due to its high solid-liquid separation capacity, good effluent water quality and small footprint. The MBR technology combines the advantages of biological treatment and membrane separation, can stably operate under high load conditions, and effectively removes organic matter, nitrogen, phosphorus and other pollutants in wastewater.

[0003] The membrane bioreactor is a technical device commonly used for potassium perchlorate wastewater treatment, which is a wastewater treatment system combining a traditional bioreactor with membrane separation technology. The MBR biological membrane wastewater treatment device mainly consists of a bioreactor, a membrane separator and a membrane assembly. The bioreactor is the core part of the wastewater treatment, which contains a biological membrane. Microorganisms attached to the surface of the biological membrane degrade organic matter in wastewater. The membrane separator plays a filtering and separating role to separate clean water and degradable substances in the bioreactor. The membrane assembly is composed of many fine membrane units for filtering wastewater and separating clean water. However, during the treatment of potassium perchlorate wastewater, the bubbles generated by the aeration pipeline are usually large in size. When they rise to contact the membrane, the impurities on the surface of the membrane are removed by the bubbles. Therefore, when the bubble size is large, the shear force of the bubble on the surface of the membrane is insufficient, making it difficult to effectively remove the impurities on the membrane surface, thereby affecting the permeability and treatment efficiency of the membrane. Therefore, we propose a wastewater treatment device for potassium perchlorate preparation. SUMMARY

[0004] The purpose of the present application is to provide a wastewater treatment device for potassium perchlorate preparation to solve the problems raised in the background art.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a wastewater treatment device for potassium perchlorate preparation, comprising a pool body for treating wastewater, a plurality of aeration frames installed at the bottom of the pool body, an aeration pipeline fixedly installed inside the aeration frame, and a membrane treatment unit for treating wastewater fixedly installed at the top of the aeration frame, wherein the membrane treatment unit comprises a membrane frame and a membrane group composed of a plurality of membrane sheets installed inside the membrane frame; a steel shaft body is fixedly installed inside the aeration frame, a plurality of spiral blades one and spiral blades two are arranged on the steel shaft body, and the spiral blades one and the spiral blades two are connected with the steel shaft body through detachable sleeves, each detachable sleeve is rotationally connected with the steel shaft body, the spiral blades one and the spiral blades two are located above the aeration pipeline, the aeration pipeline generates bubbles so that the spiral blades one and the spiral blades two are subjected to force and rotate, and the spiral blades one and the spiral blades two rotate to generate a shear field, so that the bubbles are in a stretched and deformed state.

[0006] Preferably, the spiral blades one and the spiral blades two are arranged in a staggered manner on the steel shaft body, and the diameter of the spiral blades one is greater than that of the spiral blades two.

[0007] Preferably, a plurality of sawtooth grooves are formed on the surfaces of the spiral blades one and the spiral blades two, and a plurality of arc-shaped protrusions are fixedly installed on the spiral blades one and the spiral blades two.

[0008] Preferably, an embedded sleeve is fixedly installed inside the pool body, a rotating shaft rotationally connected with the embedded sleeve is installed inside the embedded sleeve, turbulence blades are fixedly installed on the rotating shaft, a servo motor is installed on the pool body, and the output end of the servo motor is connected with one end of the rotating shaft through a belt transmission mechanism.

[0009] Preferably, a plurality of strip-shaped panels are arranged inside the membrane group, the strip-shaped panels are located between the membrane sheets and do not contact the membrane sheets, the two sides of the strip-shaped panels are arc-shaped, a plurality of conical protrusions are fixedly installed on the strip-shaped panels, and a plurality of elliptical protrusions are fixedly installed on the strip-shaped panels.

[0010] Preferably, a connecting shaft body is fixedly installed on the strip-shaped panel, the aeration frame is rotationally connected with the connecting shaft body, a plurality of annular sleeves corresponding to the connecting shaft body are fixedly installed on one side of the aeration frame, one end of the connecting shaft body extends into the annular sleeve, an annular panel is fixedly installed on the end of the connecting shaft body, and a torsion spring is connected between the annular panel and the inner wall of the connecting sleeve.

[0011] Preferably, a plurality of connecting sleeves are fixedly installed on the turbulence blades, the connecting sleeves correspond to the annular sleeves one by one, turbulence units are arranged on the connecting sleeves, and L-shaped shaft bodies are fixedly installed on the annular panel, and the ends of the L-shaped shaft bodies are located outside the annular sleeves.

[0012] Preferably, the spoiler unit comprises a spherical connector mounted inside the connecting sleeve, wherein the spherical connector is further fixedly provided with a spindle part at one end, and the L-shaped shaft body is located on the movement track of the spindle part.

[0013] Preferably, the spindle part comprises a spiral shaft body and a conical part, and the conical part is provided with a spiral groove body.

[0014] Preferably, the steel shaft body is designed in an inclined manner in the pool body.

[0015] Compared with the prior art, the beneficial effects of the present application are: The present application can effectively cut and stir the bubbles in the rotating process of the spiral blade and the spiral blade, increase the contact area and contact time of the bubbles and the liquid, promote the full mixing between the gas and the liquid, improve the mixing efficiency, help the oxygen dissolve in the water faster and more uniformly, and effectively cut the bubbles through the serrated design, so that the large bubbles are divided into small bubbles, thereby facilitating the treatment of impurities on the surface of the membrane.

[0016] The strip-shaped panel designed between the membranes increases the fluid disturbance in the membrane assembly through the rotating action, the conical bump and the oval bump installed on the strip-shaped panel further enhance the fluid disturbance effect, and the bubbles can be effectively divided during the rotating process, which helps to flush away the particles deposited on the membrane surface, and the fluid in the pool body and the membrane assembly can be effectively stirred through the rotating of the spoiler blade, which helps to maintain uniform distribution of the fluid, reduce the dead zone, and improve the overall treatment efficiency. The spindle part in the present application is connected with the connecting sleeve through the spherical connector, and has a certain degree of freedom during the rotating process of the spoiler blade, can apply uneven force to the strip-shaped panel to make it shake, thereby further enhancing the fluid disturbance effect, and the spiral shaft body and the conical part can effectively disturb the wastewater in the nearby area during the rotating process, and the liquid can generate vortex under the action of the spiral groove body, so as to flush the membrane. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure schematic diagram of the present application; Figure 2 It is the internal structure schematic diagram of the aeration frame in the pool body of the present application; Figure 3Structure diagram of aeration frame and membrane treatment unit of the present application; Figure 4 Structure diagram of internal structure of aeration frame of the present application; Figure 5 Structure diagram of separation of steel shaft and detachable sleeve of the present application; Figure 6 Structure diagram of helical blade one and helical blade two of the present application; Figure 7 Structure diagram of helical blade one of the present application; Figure 8 Structure diagram of highest point of helical blade one of the present application; Figure 9 Structure diagram of position of strip-shaped panel and membrane of the present application; Figure 10 Structure diagram of internal structure of annular sleeve of the present application; Figure 11 Structure diagram of strip-shaped panel of the present application; Figure 12 Structure diagram of spoiler blade and membrane frame of the present application; Figure 13 Structure diagram of partial structure of spoiler blade of the present application; Figure 14 Structure diagram of spoiler unit of the present application.

[0018] In the figure: 1, pool body; 2, aeration frame; 3, aeration pipeline; 4, membrane treatment unit; 41, membrane frame; 42, membrane group; 421, membrane; 43, annular sleeve; 5, steel shaft; 6, helical blade one; 7, helical blade two; 8, detachable sleeve; 9, sawtooth-shaped groove; 10, arc-shaped protrusion; 11, embedded sleeve; 12, rotating shaft; 121, spoiler blade; 122, connecting sleeve; 13, servo motor; 14, belt transmission mechanism; 15, strip-shaped panel; 151, conical protrusion; 152, elliptical protrusion; 153, connecting shaft body; 154, annular panel; 155, torsion spring; 16, spoiler unit; 161, spherical connecting piece; 162, spindle part; 163, helical shaft body; 164, conical part; 165, helical groove body; 17, L-shaped shaft body. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0020] Please refer to Figures 1-14 The present application provides a technical solution: a wastewater treatment device for potassium perchlorate preparation, which makes large-volume bubbles be broken into small-volume bubbles to enhance the effect of treating impurities on the membrane surface in view of the technical problems in the background art, and the specific improvements are shown in the accompanying drawings Figure 1 As shown, it comprises a pool body 1 for treating wastewater, and the pool body 1 can be divided into a feed pool, a conditioning pool, a membrane treatment pool and a clean water pool, a plurality of aeration frames 2 are fixedly installed at the bottom of the membrane treatment pool, and the accompanying drawings Figure 3 As shown, an aeration pipeline 3 is also fixedly installed inside the aeration frame 2, and a membrane treatment unit 4 for treating wastewater is fixedly installed at the top of the aeration frame 2, and the membrane treatment unit 4 comprises a membrane frame 41 and a membrane group 42 composed of a plurality of membrane sheets 421 installed inside the membrane frame 41, in actual application process, the aeration pipeline 3 is aerated to make a large amount of bubbles in the pool body 1 (membrane treatment pool) containing wastewater, the bubbles are used to effectively clean the impurities on the surface of the membrane sheet 421, and the treated wastewater enters the membrane sheet 421, and the treated water is transported to the clean water pool by the water collecting pipe (prior art component) in the membrane treatment unit 4, since the process of the MBR membrane group 42 for treating wastewater is prior art, the present application does not describe it too much.

[0021] In the process of treating the wastewater generated in the preparation of potassium perchlorate, since the large bubbles have a larger volume than the small bubbles, they also have a larger buoyancy, and the buoyancy is the main driving force for the bubbles to rise, so the large bubbles have a faster rising speed under the action of the buoyancy, and the contact time with the membrane sheet 421 is relatively short, and the shear force formed on the membrane surface is relatively small, the small bubbles have a small volume and a slow rising speed, and the contact time with the membrane sheet 421 is long, which can more effectively form shear force to flush the membrane surface and reduce sludge deposition, thereby delaying membrane pollution, and the gas in the aeration pipeline 3 usually produces large-volume bubbles when it contacts with the liquid, based on this, the present application is designed as follows, so that the large bubbles are broken into small bubbles, so as to effectively treat the impurities on the surface of the membrane sheet 421.

[0022] The accompanying drawings Figure 3 and the accompanying drawings Figure 4As shown, the steel shaft body 5 is fixedly installed inside the aeration frame 2 and is arranged in an inclined manner, which will be further described. In order to improve the sealing effect, the contact part between the steel shaft body 5 and the inner wall of the aeration frame 2 is designed in a horizontal manner, and a plurality of spiral blades one 6 and spiral blades two 7 are arranged on the steel shaft body 5, and the spiral blades one 6 and the spiral blades two 7 are connected with the steel shaft body 5 through detachable sleeves 8, and each detachable sleeve 8 is rotatably connected with the steel shaft body 5, that is, the spiral blades one 6 and the spiral blades two 7 are fixedly installed on the detachable sleeve 8, and in the present application, the detachable sleeve 8, the spiral blades one 6 and the spiral blades two 7 are all made of lightweight materials, and the spiral blades one 6 and the spiral blades two 7 are located above the aeration pipeline 3; When the aeration pipeline 3 generates bubbles, the spiral blades one 6 and the spiral blades two 7 will be rotated under the action of force, and the spiral blades one 6 and the spiral blades two 7 rotate to generate a shear field, so that the bubbles are in a stretched and deformed state, so that the large bubbles generated by aeration of the aeration pipeline 3 are divided into a plurality of bubbles with relatively small volumes. In order to effectively eliminate the aeration blind area and make the oxygen distribution in the aeration area more uniform, the spiral blades one 6 and the spiral blades two 7 are arranged in a staggered manner on the steel shaft body 5, and the diameter of the spiral blades one 6 is greater than that of the spiral blades two 7, wherein a plurality of sawtooth grooves 9 are formed on the surfaces of the spiral blades one 6 and the spiral blades two 7, and a plurality of arc-shaped protrusions 10 are fixedly installed on the spiral blades one 6 and the spiral blades two 7. The staggered arrangement of the spiral blades one 6 and the spiral blades two 7 and the different diameters can more effectively cut and stir the bubbles, increase the contact area and contact time of the bubbles and the liquid, promote the full mixing between the gas and the liquid, improve the mixing efficiency, help the oxygen to be dissolved in the water faster and more uniformly, and the sawtooth design can effectively cut the bubbles to divide the large bubbles into small bubbles. Combining the accompanying drawings Figures 5-8 As shown, during the rotation of the spiral blades one 6 and the spiral blades two 7 from the lowest point to the highest point, the large bubbles are separated under the action of shear force and centrifugal force, and when the spiral blades one 6 and the spiral blades two 7 rotate to the highest point, part of the bubbles on the spiral blades one 6 and the spiral blades two 7 will be stretched under the action of centrifugal force, thereby being divided into small bubbles, so that the large bubbles can be divided into small bubbles through the design, and the shear force can more effectively flush the membrane surface to reduce sludge deposition.

[0023] In order to enable the bubbles in other areas of the pool body 1 to effectively flush the diaphragm 421, the embedded sleeve 11 is fixedly installed inside the pool body 1, and the rotating shaft 12 is rotatably connected inside the embedded sleeve 11, wherein the rotating shaft 12 is fixedly installed with the spoiler blades 121, wherein the servo motor 13 is installed on the pool body 1, and the servo motor 13 is connected with one end of the rotating shaft 12 through the belt transmission mechanism 14, wherein a plurality of strip-shaped panels 15 are arranged inside the membrane group 42, and the strip-shaped panels 15 are located between the diaphragms 421 and do not contact the diaphragms 421, wherein the two sides of the strip-shaped panel 15 are arc-shaped, and a plurality of conical protrusions 151 and a plurality of elliptical protrusions 152 are fixedly installed on the strip-shaped panel 15, so that when the bubbles rise to the strip-shaped panel 15, the conical protrusions 151 on the strip-shaped panel 15 can break the bubbles again, so that the bubbles are broken again to enhance the flushing force on the surface of the diaphragm 421, and if the strip-shaped panel 15 rotates, the conical protrusions 151 can effectively contact the bubbles and be broken into small bubbles, and the elliptical protrusions 152 can effectively make the bubbles be stretched into small bubbles, so that the diaphragm 421 can be effectively cleaned.

[0024] The connecting shaft body 153 is fixedly installed on the strip-shaped panel 15, and the aeration frame 2 is rotatably connected with the connecting shaft body 153, and a plurality of annular sleeves 43 corresponding to the connecting shaft body 153 are fixedly installed on one side of the aeration frame 2, one end of the connecting shaft body 153 extends into the annular sleeve 43, and the annular panel 154 is fixedly installed on the end of the connecting shaft body 153, and the torsional spring 155 is connected between the annular panel 154 and the inner wall of the connecting sleeve 122; a plurality of connecting sleeves 122 are fixedly installed on the spoiler blades 121, and the connecting sleeves 122 correspond to the annular sleeves 43, wherein the connecting sleeve 122 is provided with the spoiler unit 16, and the L-shaped shaft body 17 is fixedly installed on the annular panel 154, and the end of the L-shaped shaft body 17 is located outside the annular sleeve 43; the spoiler unit 16 comprises the spherical connecting piece 161 installed inside the connecting sleeve 122, wherein the one end of the spherical connecting piece 161 is also fixedly installed with the spindle 162, the spindle 162 comprises the spiral shaft body 163 and the conical portion 164, and the conical portion 164 is provided with the spiral groove 165, and the L-shaped shaft body 17 is located on the movement track of the spindle 162.

[0025] In combination with the drawings Figures 9-11As shown, when the servo motor 13 starts, its output end drives the rotating shaft 12 to rotate through the belt transmission mechanism 14, and the embedded sleeve 11 is used to stabilize the rotation of the rotating shaft 12. During the rotation of the rotating shaft 12, the spoiler blades 121 on the rotating shaft 12 rotate synchronously. During the rotation of the spoiler blades 121, the spoiler blades 121 can effectively globally agitate the fluid in the pool body 1 and the membrane group 42, which helps to maintain the uniform distribution of the fluid. During the rotation of the spoiler blades 121, the connecting sleeve 122 on the spoiler blades 121 drives the spindle part 162 to move in a circle through the spherical connecting piece 161. Since the spindle part 162 and the connecting sleeve 122 are connected through the spherical connecting piece 161, the spindle part 162 has a certain degree of freedom during the rotation of the spoiler blades 121, so that the spiral shaft body 163 and the conical part 164 can agitate the liquid in the surrounding area during the rotation, and the water flow near the membrane group 42 generates vortex under the action of the spiral groove body 165, so as to wash the membrane 421. During the rotation of the spindle part 162, the L-shaped shaft body 17 is subjected to an acting force, so that the L-shaped shaft body 17 drives the annular panel 154 to rotate, the torsional spring 155 is deformed, and the annular panel 154 drives the strip-shaped panel 15 to rotate through the connecting shaft body 153, so that the strip-shaped panel 15 can swing under the action of the torsional spring 155. On the one hand, the strip-shaped panel 15 enhances the fluid disturbance effect between the membrane 421, and on the other hand, the strip-shaped panel 15 can effectively divide the bubbles during the swinging process through the conical protrusion 151 and the oval protrusion 152, which helps to wash away the particles deposited on the membrane surface, so as to effectively treat the deposited impurities on the surface of the membrane 421 under the structure design of the present application, thereby maintaining a high membrane flux, which helps to prolong the operation cycle of the membrane group 42 and reduce the cleaning frequency and replacement cost.

[0026] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment device for potassium perchlorate preparation, characterized in that: The invention comprises a tank body (1) for treating wastewater, a plurality of aeration frames (2) installed at the bottom of the tank body (1), an aeration pipe (3) fixedly installed inside the aeration frame (2), and a membrane treatment unit (4) for treating wastewater fixedly installed on the top of the aeration frame (2), and the membrane treatment unit (4) comprises a membrane frame (41) and a membrane group (42) composed of a plurality of membrane sheets (421) installed inside the membrane frame (41); a steel shaft (5) fixedly installed inside the aeration frame (2), and a plurality of spiral blades (6) and spiral blades (7) are provided on the steel shaft (5). The spiral blade 2 (7), the spiral blade 1 (6) and the spiral blade 2 (7) are all connected to the steel shaft (5) via a detachable sleeve (8). Each detachable sleeve (8) is rotatably connected to the steel shaft (5). The spiral blade 1 (6) and the spiral blade 2 (7) are located above the aeration pipe (3). The aeration pipe (3) generates bubbles, causing the spiral blade 1 (6) and the spiral blade 2 (7) to rotate under the action of a force. The spiral blade 1 (6) and the spiral blade 2 (7) rotate to generate a shear force field, so that the bubbles are in a stretched and deformed state.

2. A wastewater treatment device for potassium perchlorate preparation according to claim 1, characterized in that: The spiral blade 1 (6) and the spiral blade 2 (7) are arranged in a staggered manner on the steel shaft (5), and the diameter of the spiral blade 1 (6) is larger than the diameter of the spiral blade 2 (7).

3. A wastewater treatment device for potassium perchlorate preparation according to claim 2, characterized in that: The surfaces of the spiral blade 1 (6) and the spiral blade 2 (7) are both provided with a plurality of sawtooth-shaped grooves (9), and a plurality of arc-shaped protrusions (10) are fixedly mounted on the spiral blade 1 (6) and the spiral blade 2 (7).

4. A wastewater treatment device for potassium perchlorate preparation according to claim 1, characterized in that: An embedded sleeve (11) is fixedly installed inside the pool body (1), and a rotating shaft (12) rotatably connected to the embedded sleeve (11) is installed inside the embedded sleeve (11), wherein a spoiler blade (121) is fixedly installed on the rotating shaft (12), wherein a servo motor (13) is installed on the pool body (1), and an output end of the servo motor (13) is connected to one end of the rotating shaft (12) via a belt transmission mechanism (14).

5. A wastewater treatment device for potassium perchlorate preparation according to claim 4, characterized in that: A plurality of strip panels (15) are provided inside the membrane group (42), the strip panels (15) are located between the membrane sheets (421) and do not contact the membrane sheets (421), wherein both sides of the strip panels (15) are arc-shaped, and a plurality of conical protrusions (151) are fixedly mounted on the strip panels (15), and a plurality of elliptical protrusions (152) are fixedly mounted on the strip panels (15).

6. A wastewater treatment device for potassium perchlorate preparation according to claim 5, characterized in that: A connecting shaft (153) is fixedly mounted on the strip panel (15), and the aeration frame (2) is rotatably connected to the connecting shaft (153). A plurality of annular sleeves (43) corresponding one to one with the connecting shaft (153) are fixedly mounted on one side of the aeration frame (2). One end of the connecting shaft (153) extends into the interior of the annular sleeve (43). An annular panel (154) is fixedly mounted on the end of the connecting shaft (153), and a torsion spring (155) is connected between the annular panel (154) and the inner wall of the connecting sleeve (122).

7. A wastewater treatment device for potassium perchlorate preparation according to claim 6, characterized in that: A plurality of connecting sleeves (122) are fixedly mounted on the spoiler blade (121), and the connecting sleeves (122) correspond one-to-one to the annular sleeve (43), wherein a spoiler unit (16) is provided on the connecting sleeve (122), and an L-shaped shaft (17) is fixedly mounted on the annular panel (154), and an end of the L-shaped shaft (17) is located outside the annular sleeve (43).

8. A wastewater treatment device for potassium perchlorate preparation according to claim 7, characterized in that: The spoiler unit (16) includes a spherical connector (161) installed inside the connecting sleeve (122), wherein a spindle portion (162) is fixedly installed on one end of the spherical connector (161), and the L-shaped shaft (17) is located on the motion trajectory of the spindle portion (162).

9. A wastewater treatment device for potassium perchlorate preparation according to claim 8, characterized in that: The spindle portion (162) comprises a spiral shaft (163) and a conical portion (164), and a spiral groove (165) is provided on the conical portion (164).

10. The wastewater treatment device for potassium perchlorate preparation according to claim 1, characterized in that: The steel shaft (5) is designed to be inclined in the tank body (1).

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