Water tank for cultivation

Abstract

The utility model provides a cultivation water tank which comprises a tank body, a drainage pipe, a water pumping unit, a top cover, an opening and a positioning water inlet unit, the water pumping unit is located on the top cover, and the water pumping unit is matched with the top end of the drainage pipe located in the tank body so as to close or open the end of the drainage pipe; drinking water is contained in the box body, the drinking water is introduced through the positioning water inlet unit, water can enter the positioning water inlet unit by automatically adjusting the height of a floating ball valve in the positioning water inlet unit, the higher the height of the floating ball valve is, the larger the water storage capacity is, and on the contrary, the lower the height of the floating ball valve is, the smaller the water storage capacity is. The pulling rope is pulled, the drainage pipe is directly communicated with the box body to promote water to be directly discharged and communicated with the farm, and the water outlet pipe is designed, so that the impact force of water outlet is reduced, feed in other feed boxes is connected to the water outlet pipe, the purpose of mixing water and feed is achieved, and water resources are saved.

Description

Technical Field

[0001] This utility model relates to a water tank for aquaculture, belonging to the field of aquaculture equipment. Background Technology

[0002] When feeding pigs, it is wasteful to let them drink water alone, so appropriate amounts of water should be mixed into their feed.

[0003] The prior art application number is CN202120350937.7, and the patent application title is a drinking water device for pig farming. It discloses that a water outlet control valve is installed on the drain pipe, a water-stopping circular plate is rotatably set at the water outlet end of the drain pipe, a baffle is set on the inner wall of the upper end of the drain pipe, the water-stopping circular plate is connected to a movable rod, the movable rod extends downward and is connected to a float ball, the float ball floats on the upper layer of the water surface in the drinking tank. This utility model is easy to clean, simple to operate, and does not easily breed bacteria, which is conducive to the healthy feeding of pigs.

[0004] Existing technologies all use a float as the water inlet switch. The float floats with the change of water volume. As the main component of the water inlet switch, it is unstable and easily causes misalignment, affecting the water inlet.

[0005] Therefore, this utility model provides an aquaculture water tank with accurate positioning, adjustable water level, and multi-angle control. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide an aquaculture water tank with accurate positioning, adjustable water level, and multi-angle control.

[0007] This utility model is implemented as follows:

[0008] A water tank for aquaculture includes a tank body and a drain pipe, wherein the drain pipe is fixed to the center of the bottom surface of the tank body and is connected to the interior of the tank body;

[0009] The top cover is fitted to the top of the box body, the water pumping unit is located on the top cover, and the water pumping unit cooperates with the top of the drain pipe located inside the box body to close or open the end of the drain pipe.

[0010] The opening and positioning water inlet unit are provided. There are two openings, which are respectively opened at both ends of the diagonal line of the top cover. The positioning water inlet unit is also located at the corner of the box where this diagonal line is located.

[0011] The water outlet pipe is aligned with the bottom end of the drain pipe and is curved.

[0012] A fixing ring and a stainless steel pipe are used, with the bottom end of the water outlet pipe connected to the stainless steel pipe via the fixing ring.

[0013] As a further improvement, the pumping unit includes a perforated cylinder located at the top of the drain pipe;

[0014] A plug that moves up and down within the hollowed-out cylinder;

[0015] The traction rope, the first pulley group, and the second pulley group are provided. The first pulley group is fixed on the edge of the opening near the top cover, and the second pulley group is fixed on the inner surface of the top cover and is inclined between the two first pulley groups, so that one end of the traction rope is fixed to the end cap, and the other end passes through the second pulley group and the first pulley group in sequence before being exposed to the outside.

[0016] Pulling the traction rope will either lift or lower the plug.

[0017] As a further improvement, the box body includes an opening, and the inner and outer walls of the corners of the box body are respectively provided with a first limiting groove and a second limiting groove.

[0018] As a further improvement, the positioning water inlet unit includes a water inlet pipe, a connecting plate, a positioning rod, and a limiting rod;

[0019] The bottom surface of the connecting plate is horizontally fixed with a positioning rod, a limiting rod, and a water inlet pipe. The limiting rod and the positioning rod slide up and down in the first limiting groove and the second limiting groove, respectively. The bottom end of the positioning rod is fixed on the second limiting groove by an adjuster.

[0020] The top of the water inlet pipe passes through the connecting plate and is connected to an external water source.

[0021] It also includes a float valve, which is installed at the bottom of the inlet pipe located inside the inlet pipe.

[0022] As a further improvement, the adjuster includes a U-shaped plate and a bolt. The U-shaped plate is disposed at the bottom end of the positioning rod. When the positioning rod is assembled into the second limiting groove, the U-shaped plate is fitted onto the outer wall of the second limiting groove. The bolt passes horizontally through the middle part of the U-shaped plate and is fixed to the positioning rod. The connection between the bolt and the U-shaped plate is a threaded connection.

[0023] As a further improvement, the float valve includes a fixed head and a housing, the housing being separate from or closed from the fixed head fixed to the bottom end of the housing;

[0024] The water inlet trough and the water distribution pipe are provided. The water inlet trough is located on the inner end face of the fixed head, and the water distribution pipe is vertically fixed at a position off-center from the fixed head. The water inlet trough and the first end of the water distribution pipe are horizontally connected.

[0025] The floating block and the clamping component are located between the floating block and the housing, so that the clamping component can drive the floating block to tightly engage or disengage with the water inlet tank, thereby stopping water intake and allowing water to enter.

[0026] The end of the water distribution pipe is exposed to the outside after passing through the floating block, the clamping component, and the casing in sequence.

[0027] As a further improvement, the floating block includes a main board and a support column, with the support column vertically fixed to the bottom surface of the main board;

[0028] The main board has a boss on its top surface and a groove for accommodating the spring inside the boss.

[0029] The closed head is fitted onto the top surface of the boss and, under the action of the clamping element, fully engages or disengages from the water inlet tank to achieve the stopping and starting of water intake.

[0030] As a further improvement, the floating block also includes air holes, a number of which are respectively opened on the sealing head and the main board, and the two air holes are on the same axis;

[0031] The hinge piece and the plug are fitted onto the first end of the hinge piece, and the hinge piece is rotatably connected to the bottom surface of the motherboard. The free end is fitted onto the support post. When the free end of the hinge piece contacts the bottom surface of the motherboard, the plug just seals the vent on the motherboard.

[0032] As a further improvement, the bottom end of the support column passes through the clamping member and the sleeve and is flush with the bottom end of the sleeve.

[0033] As a further improvement, the clamping element is a hollow polyhedron.

[0034] The beneficial effects of this utility model are:

[0035] ① This utility model mainly uses a box to hold drinking water, which is introduced through a positioning water inlet unit. The positioning water inlet unit can independently adjust the height of the float valve in the positioning water inlet unit to allow water to enter. The higher the float valve is, the larger the water storage capacity, and vice versa. Pulling the traction rope directly connects the drain pipe to the box, allowing water to be discharged directly and connected to the breeding farm.

[0036] ② The water outlet pipe of this utility model is curved, which serves two purposes: first, to reduce the force of the water flow; and second, to allow feed from other feed bins to be connected to the water outlet pipe, thus achieving the effect of mixing water and feed.

[0037] ③ The float valve of this utility model has a stable position. It remains stationary when switching between water inlet and water stop states, achieving accurate positioning. The switching between water inlet and water stop states is rapid and stable, and the switching is more accurate.

[0038] ④ The floating block of this utility model has a narrow range of vertical movement and a relatively low vertical height, resulting in fast blocking speed, tight blockage, and good sealing effect.

[0039] ⑤ The positioning water inlet unit of this utility model can be installed at two openings, depending on the actual situation, so as to achieve multi-angle control of water pumping. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a structural schematic diagram of a water tank for aquaculture provided in an embodiment of the present invention.

[0042] Figure 2 This is a partial structural schematic diagram of a water tank for aquaculture provided in an embodiment of this utility model.

[0043] Figure 3 This is a schematic diagram of the tank structure of a water tank for aquaculture provided by an embodiment of the present invention.

[0044] Figure 4 This is a schematic diagram of the positioning water inlet unit structure of a water tank for aquaculture provided by an embodiment of the present invention.

[0045] Figure 5 This is a top view of the top cover of a water tank for aquaculture provided in this embodiment of the utility model.

[0046] Figure 6 This is a bottom view of the top cover of a water tank for aquaculture provided in this embodiment of the utility model.

[0047] Figure 7 This is an exploded view of the float valve structure of a water tank for aquaculture provided by an embodiment of the present invention.

[0048] Figure 8 This is a schematic diagram of the float block structure of an aquaculture water tank provided by an embodiment of the present invention.

[0049] Figure 9 This is a schematic diagram of the internal structure of the float block of a water tank for aquaculture provided by an embodiment of the present invention.

[0050] Figure 10 This is a top view of the float block of an aquaculture water tank provided in an embodiment of this utility model. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0052] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] Reference Figures 1-10 As shown, this utility model provides a specific embodiment of a water tank for aquaculture, including a tank body 4 and a drain pipe 6. The drain pipe 6 is fixed to the center of the bottom surface of the tank body 4 and is connected to the inside of the tank body 4.

[0054] The top cover 2 is mounted on the top of the box body 4. The top cover 2 is located on the top cover 2. The top cover 2 is located on the top cover 2. The top cover 1 is engaged with the top of the drain pipe 6 located inside the box body 4 to close or open the end of the drain pipe 6.

[0055] The top cover 2 has two openings 202, which are respectively located at the two ends of the diagonal of the top cover 2. The positioning water inlet unit 3 is also located at the angle of the box 4 along the same diagonal. The positioning water inlet unit 3 can be installed at the two openings 202, depending on the actual situation, so as to realize multi-angle control of water pumping.

[0056] The water outlet pipe 7 is aligned with the bottom end of the drain pipe 6. The water outlet pipe 7 is curved, which serves two purposes: first, to reduce the force of the water flow; and second, to allow feed from other feed bins to be connected to the water outlet pipe 7, thus mixing water and feed and saving water resources.

[0057] The water outlet pipe 7 is connected to the stainless steel pipe 9 via the fixing ring 8 at its bottom end.

[0058] This utility model mainly uses a box 4 to hold drinking water, which is introduced through a positioning water inlet unit 3. The positioning water inlet unit 3 can independently adjust the height of the float valve 305 in the positioning water inlet unit 3 to allow water to enter. The higher the float valve 305 is, the larger the water storage capacity, and vice versa.

[0059] Pulling the traction rope 102 connects the drain pipe 6 directly to the box 4, allowing water to drain directly and connecting to the farm.

[0060] As one possible specific embodiment of this utility model, the box 4 is made of transparent or semi-transparent material, and the water volume inside the box 4 can be directly observed with the naked eye from the outside. It is simple, practical and easy to adjust.

[0061] The pumping unit 1 includes a hollow cylinder 104 located at the top of the drain pipe 6;

[0062] The plug 103 moves up and down in the hollowed-out cylinder 104;

[0063] The traction rope 102, the first pulley group 101, and the second pulley group 105 are provided. The first pulley group 101 is fixed on the edge of the opening 202 near the top cover 2, and the second pulley group 105 is fixed on the inner surface of the top cover 2 and is inclined between the two first pulley groups 101, so that one end of the traction rope 102 is fixed on the plug 103, and the other end passes through the second pulley group 105 and the first pulley group 101 in sequence before the end is exposed to the outside.

[0064] Pulling the traction rope 102 will lift the plug 103, opening the top of the drain pipe 6 and allowing water to flow directly; or lowering the plug 103 will close the top of the drain pipe 6 and stop the water from flowing out.

[0065] The box body 4 is included at the opening 202, and the inner and outer walls of the corners of the box body 4 are respectively provided with a first limiting groove 401 and a second limiting groove 402.

[0066] As one possible specific embodiment of this utility model, there are engraved scales on the surface of the box 4 next to the second limiting groove 402, and the water storage volume can be known by directly looking at the scales.

[0067] The positioning water inlet unit 3 includes a water inlet pipe 301, a connecting plate 302, a positioning rod 303, and a limiting rod 304.

[0068] The bottom surface of the connecting plate 302 is horizontally fixed with a positioning rod 303, a limiting rod 304, and a water inlet pipe 301. The limiting rod 304 and the positioning rod 303 slide up and down in the first limiting groove 401 and the second limiting groove 402 respectively. The bottom end of the positioning rod 303 is fixed on the second limiting groove 402 by an adjuster.

[0069] The top end of the water inlet pipe 301 passes through the connecting plate 302 and is connected to an external water source;

[0070] It also includes a float valve 305, which is installed at the bottom end of the inlet pipe 301.

[0071] The float valve 305 of this utility model has a stable position. It remains unchanged when switching between water inlet and water stop states, achieving accurate positioning. The switching between water inlet and water stop states is rapid and stable, and the switching is more accurate.

[0072] Furthermore, the adjuster includes a U-shaped plate 307 and a bolt 306. The U-shaped plate 307 is disposed at the bottom end of the positioning rod 303. When the positioning rod 303 is assembled into the second limiting groove 402, the U-shaped plate 307 is fitted onto the outer wall of the second limiting groove 402. The bolt 306 horizontally penetrates the middle part of the U-shaped plate 307 and is then fixed to the positioning rod 303. The connection between the bolt 306 and the U-shaped plate 307 is a threaded connection, which allows for precise adjustment of the pressure of the U-shaped plate 307 on the positioning rod 303, improving practicality.

[0073] Furthermore, the float valve 305 includes a fixed head 356 and a housing 355, wherein the housing 355 is separate from or closed from the fixed head 356 fixed at the bottom end of the housing 355.

[0074] The water inlet trough 351 and the water distribution pipe 352 are provided. The water inlet trough 351 is opened on the inner end face of the fixed head 356. The water distribution pipe 352 is vertically fixed at a position off-center from the fixed head 356. The water inlet trough 351 and the first end of the water distribution pipe 352 are horizontally connected.

[0075] The floating block 353 and the clamping member 354 are located between the floating block 353 and the housing 355, so that the clamping member 354 drives the floating block 353 to be tightly connected or separated from the water inlet tank 351, thereby stopping water inlet and water inlet.

[0076] The end of the water distribution pipe 352 passes through the floating block 353, the clamping member 354, and the casing 355 in sequence before being exposed to the outside.

[0077] With this design structure, the floating block 353 has a narrow range of vertical movement and a relatively low vertical height, resulting in fast blocking speed, tight blockage, and good sealing effect.

[0078] More specifically, the floating block 353 includes a main board 3-3 and a support column 3-6, with the support column 3-6 vertically fixed to the bottom surface of the main board 3-3;

[0079] The main board 3-3 has a boss 3-2 on its top surface and a groove inside the boss 3-2 to accommodate the spring 3-7.

[0080] The closed head 3-1 is fitted onto the top surface of the boss 3-2 and, under the action of the clamping member 354, fully engages or disengages from the water inlet groove 351 to achieve the stopping and starting of water intake.

[0081] The floating block 353 also includes two air holes 3-8, which are respectively opened on the closed head 3-1 and the main board 3-3, and the two air holes 3-8 are on the same axis.

[0082] The hinge piece 3-5 and the plug 3-4 are fitted onto the first end of the hinge piece 3-5, and the hinge piece 3-5 is rotatably connected to the bottom surface of the main board 3-3. The free end is fitted onto the support post 3-6. When the free end of the hinge piece 3-5 contacts the bottom surface of the main board 3-3, the plug 3-4 just seals the air hole 3-8 on the main board 3-3.

[0083] More specifically, the bottom end of the support column 3-6 passes through the clamping member 354 and the sleeve 355 and is flush with the bottom end of the sleeve 355.

[0084] More specifically, the clamping member 354 is a hollow polyhedron. The hollow interior of the clamping member 354, compared to a solid structure, requires less buoyancy.

[0085] More specifically, the bottom surface of the casing 355 is hollowed out.

[0086] The operating principle of float valve 305 is as follows:

[0087] When there is water in the tank 4, pulling the traction rope 102 will lift the plug 103, opening the top of the drain pipe 6 and allowing water to flow out directly. As the water inside the tank 4 gradually drains out, the plug 103 is lowered, closing the top of the drain pipe 6 and stopping the water flow. At this time, the sealing head 3-1 inside the float valve 305, under the elastic action of the spring 3-7, directly and completely engages with the water inlet groove 351 in the fixed head 356, stopping the water intake.

[0088] In the initial stage of water intake of the housing 4, water is directly introduced through the water inlet pipe 301 of the positioning water inlet unit 3 and flows to the water inlet tank 351. As the water in the water inlet tank 351 gradually increases, it presses against the sealing head 3-1, causing the sealing head 3-1 to deform and fit against the inner wall of the groove of the boss 3-2. As the water volume increases, the water inlet tank 351 can no longer hold more water and will flow to the water distribution pipe 352, flowing into the housing 4 from the end of the water distribution pipe 352.

[0089] As water gradually enters the housing 4, the water level inside the housing 4 gradually rises, slowly submerging the entire float valve 305. Water also gradually enters from the bottom of the housing 355. The floating of the water causes the hollow internal clamping component 354 to move upward, pressing the hinge 3-5 into contact with the main board 3-3. The block 3-4 just seals the air hole 3-8 on the main board 3-3. When the water level inside the housing 4 completely submerges the entire float valve 305, the water distribution pipe 352 and the water inlet groove are filled with water, leaving only a gap between the boss 3-2 and the sealing head 3-1. Water will gradually enter, making the water pressure on the two ends of the sealing head 3-1 consistent. Under the elastic action of the spring 3-7, the sealing head 3-1 directly and completely fits the water inlet groove 351 in the fixed head 356, stopping the water inlet and achieving the purpose of automatic water shut-off.

[0090] As one possible specific embodiment of this utility model, the drain pipe 6 can also be equipped with a valve 5, and the drain pipe 6 can control the inflow and outflow of water through the valve.

[0091] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An aquaculture water tank characterized by, It comprises a box (4) and a drain pipe (6), the drain pipe (6) is fixed in the middle of the bottom of the box (4), and the drain pipe (6) is communicated with the inside of the box (4); A pumping unit (1) and a top cover (2), the top end of the box (4) is equipped with the top cover (2), the pumping unit (1) is located on the top cover (2), and the pumping unit (1) and the top end of the drain pipe (6) located in the box (4) are matched to close or open the end of the drain pipe (6); An opening (202) and a positioning water inlet unit (3), the opening (202) is two, which is opened at the two ends of the diagonal line of the top cover (2), and the positioning water inlet unit (3) is also located at the corner of the box (4) where the diagonal line is located; A water outlet pipe (7), the water outlet pipe (7) is aligned with the bottom end of the drain pipe (6), and the water outlet pipe (7) is curved; A fixing ring (8) and a stainless steel pipe (9), the bottom end of the water outlet pipe (7) is connected with the stainless steel pipe (9) through the fixing ring (8).

2. The water tank for aquaculture according to claim 1, characterized by The pumping unit (1) comprises a hollow cylinder (104) located at the top end of the drain pipe (6); A plug (103) moving up and down in the hollow cylinder (104); A traction rope (102), a first pulley block (101) and a second pulley block (105), the first pulley block (101) is fixed on the edge of the opening (202) close to the top cover (2), the second pulley block (105) is fixed on the inner surface of the top cover (2) and is inclinedly arranged between the two groups of first pulley blocks (101), so that one end of the traction rope (102) is fixed on the plug (103), and the other end is sequentially wound around the second pulley block (105) and the first pulley block (101) and then exposed outside; Pulling the traction rope (102) will lift or lower the plug (103).

3. The aquaculture tank of claim 2, wherein The box (4) comprises a first limiting groove (401) and a second limiting groove (402) arranged on the inner wall and the outer wall of the corner of the box (4) at the opening (202).

4. The aquaculture tank of claim 3, wherein The positioning water inlet unit (3) comprises a water inlet pipe (301), a connecting plate (302), a positioning rod (303) and a limiting rod (304); The bottom surface of the connecting plate (302) is horizontally fixed with the positioning rod (303), the limiting rod (304) and the water inlet pipe (301) in sequence, the limiting rod (304) and the positioning rod (303) slide up and down in the first limiting groove (401) and the second limiting groove (402) respectively, and the bottom end of the positioning rod (303) is fixed on the second limiting groove (402) through an adjuster; The top end of the water inlet pipe (301) penetrates through the connecting plate (302) and is communicated with an external water source; It also comprises a float ball valve (305), which is installed at the bottom end of the water inlet pipe (301) in the water inlet pipe (301).

5. The aquaculture tank of claim 4, wherein The regulator comprises a U-shaped plate (307) and a bolt (306), the U-shaped plate (307) is arranged at the bottom end of the positioning rod (303), when the positioning rod (303) is assembled to the second limiting groove (402), the U-shaped plate (307) is sleeved on the outer wall of the second limiting groove (402), and the bolt (306) is fixed with the positioning rod (303) after penetrating through the middle part of the U-shaped plate (307) horizontally; the connection position of the bolt (306) and the U-shaped plate (307) adopts threaded connection.

6. The water tank for aquaculture according to claim 4, wherein The floating ball valve (305) comprises a fixed head (356) and a sleeve (355), the sleeve (355) is separated or closed with the fixed head (356) fixed at the bottom end of the sleeve (355); The water inlet groove (351) and the water distribution pipe (352), the water inlet groove (351) is opened in the inner end surface of the fixed head (356), the water distribution pipe (352) is vertically fixed at the position deviating from the center of the fixed head (356), and the first end of the water inlet groove (351) and the water distribution pipe (352) are horizontally communicated; The floating block (353) and the compression piece (354), the compression piece (354) is located between the floating block (353) and the sleeve (355), so that the compression piece (354) drives the floating block (353) to be combined or separated with the water inlet groove (351), to realize stopping water inlet and water inlet; The tail end of the water distribution pipe (352) penetrates the floating block (353), the compression piece (354) and the sleeve (355) in sequence and is exposed outside.

7. The aquaculture tank of claim 6, wherein The floating block (353) comprises a main plate (3-3) and a support column (3-6), the support column (3-6) is vertically fixed at the bottom end surface of the main plate (3-3); The main plate (3-3) is provided with a boss (3-2) at the top end surface, and the boss (3-2) is internally provided with a recess for accommodating a spring (3-7); The closed head (3-1) is sleeved at the top end surface of the boss (3-2), and is completely matched or separated with the water inlet groove (351) under the action of the compression piece (354), to realize stopping water inlet and water inlet.

8. The aquaculture tank of claim 7, wherein, The floating block (353) further comprises air holes (3-8), the number of the air holes (3-8) is two, which are respectively opened on the closed head (3-1) and the main plate (3-3), and the two air holes (3-8) are on the same axis; The hinge piece (3-5) and the plug (3-4) are arranged at the first end of the hinge piece (3-5), the hinge piece (3-5) is rotationally connected to the bottom surface of the main plate (3-3), and the free end is sleeved on the support column (3-6), when the free end of the hinge piece (3-5) contacts the bottom surface of the main plate (3-3), the plug (3-4) just closes the air hole (3-8) on the main plate (3-3).

9. The aquaculture tank of claim 7, wherein, The bottom end of the support column (3-6) penetrates the compression piece (354) and the sleeve (355) and is flush with the bottom end of the sleeve (355).

10. The aquaculture tank of claim 6, wherein, The compression piece (354) is a hollow polyhedron.

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