Graded concentration device for plankton

Abstract

The utility model relates to a graded concentration device for plankton, which comprises a barrel, an inflow port for fluid to flow in is arranged on the upper portion of the barrel, a first outflow port for fluid to flow out is arranged on the lower portion of the barrel, and a screen for separating target plankton is further arranged below the inflow port. The device is characterized in that a collecting piece with a collecting space is arranged at the downstream tail end of the flow path of fluid on the barrel body, and a second outflow opening communicated with the fluid in the collecting space is formed in the bottom of the barrel body; the first flow-out opening and the second flow-out opening can be selectively opened, when the device is in a separation state, the first flow-out opening is opened to discharge fluid, and when the device is in a collection state, the second flow-out opening is opened to enable target planktons to flow into the collection space. And the bottom of the cylinder is provided with a second outflow port communicated with the fluid in the collection space, so that the finally collected target plankton can be prevented from being transferred for the second time, and the operation is convenient and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of aquatic organism screening, in particular to a grading and concentration device which is convenient for screening plankton. Background Art

[0002] Plankton refers to drifting organisms that live in water but lack the ability to move effectively. They are a crucial group of aquatic organisms, crucial for water quality assessment, ecological research, and biodiversity conservation. Therefore, collecting diverse plankton species for research is often necessary. However, plankton often occurs mixed together, making it difficult to collect target species. Therefore, a commonly used collection method utilizes the size differences between various plankton species to perform fractional screening and concentration operations.

[0003] To this end, there is a graded sieve drum disclosed in the prior art, for example, in the Chinese utility model patent CN202222669168.4 (publication number CN218421262U), titled "A sieve drum for collecting plankton in water." The sieve drum is equipped with screens of varying mesh sizes, and can be used to pour water to be collected from the top sieve drum opening and drain water from the bottom sieve drum opening, thereby gradually screening and concentrating the plankton, thereby collecting target plankton of a specific size. To avoid collecting too many impurities, the mesh sizes of the screens at each level are usually increased from top to bottom, with the bottom sieve drum ultimately being used to collect the target species.

[0004] However, this type of grading and concentration device still has the following defects during actual use: First, if only the water to be collected is poured in, it is often not enough to fully separate and concentrate the plankton of each grade because a large amount of plankton accumulates on the screen. Therefore, it is usually necessary to repeatedly and evenly rinse the screen surface with flushing water such as pure water to achieve sufficient separation. In order to avoid overflow of the water to be collected and the pure water, the bottom of the traditional grading and concentration device is often an outflow outlet for the outflow of fluid. This results in the target plankton finally obtained after separation often remaining on the screen. On the one hand, it is easy to die due to lack of water. On the other hand, if it is to be used for research, the operator still needs to use flushing water to rinse it and transfer it to a container such as a culture dish for a second time, which is relatively inconvenient; second, in this process, the operator is usually required to hold the cylinder and move it back and forth under the flushing water source to fully rinse the entire area of the screen, which is relatively time-consuming and cumbersome. Therefore, there is still a need to further improve the existing grading and concentration device. Utility Model Content

[0005] The first technical problem to be solved by the present invention is to provide a grading concentration device capable of avoiding secondary transfer of the target plankton finally collected in response to the above-mentioned existing technical status.

[0006] The second technical problem to be solved by the present invention is to provide a grading concentration device that can reduce the labor intensity of operators in response to the above-mentioned existing technical status.

[0007] The technical solution adopted by the present invention to solve the first technical problem is as follows: the grading and concentrating device for plankton includes a cylinder, an upper portion of the cylinder is provided with an inlet for fluid inflow, a lower portion is provided with a first outlet for fluid outflow, and a screen for separating target plankton is further provided below the inlet;

[0008] The invention is characterized in that: a collecting member is provided at the downstream end of the cylinder along the flow path of the fluid, and the collecting member has a collecting space for collecting target plankton, and correspondingly, a second outflow port is provided at the bottom of the cylinder in fluid communication with the collecting space;

[0009] The first outflow port and the second outflow port can be opened selectively. When the grading and concentrating device is in a separation state, the first outflow port is opened to allow fluid to be discharged. When the grading and concentrating device is in a collection state, the second outflow port is opened to allow target plankton to flow into the collection space.

[0010] To prevent a large amount of target plankton from being discharged with the fluid from the first outlet when the grading and concentrating device is in the separated state, preferably, the bottom of the cylinder is partially recessed, and the second outlet is located at the lowest point of the recessed bottom of the cylinder. Correspondingly, the first outlet is located above the second outlet. Providing a partially recessed bottom of the cylinder, the second outlet at the lowest point of the recessed bottom of the cylinder, and the first outlet above the second outlet helps temporarily store the target plankton in the recessed area, allowing only overflowing fluid to be discharged from the first outlet. This prevents a large amount of target plankton from being discharged with the fluid from the first outlet when the grading and concentrating device is in the separated state.

[0011] Furthermore, to facilitate the discharge of fluid from the first outlet to the outside, the first outlet is preferably provided on the side wall of the barrel, and correspondingly, the collecting member and the bottom of the barrel together surround and form the collection space. This design simplifies the arrangement of the first outlet while meeting the requirements, and the collection space becomes an independent space relative to the first outlet, resulting in a more reasonable layout.

[0012] To facilitate removal of the collecting member for direct use in studying the target plankton, the collecting member is preferably a cylindrical member with an open upper end, and the collecting member and the barrel are detachably connected by a sleeve or screw connection. The sleeve or screw connection can be used to achieve a relatively simple and reliable detachable connection between the collecting member and the barrel. For example, by providing an internal thread on the inner wall of the collecting member opening and an external thread on the outer portion of the lower portion of the barrel, the collecting member and the barrel can be screwed together.

[0013] In order to selectively open the first outlet and the second outlet, preferably, a valve body for controlling channel opening and closing is provided in the first outlet and the second outlet. The valve body can be, for example, a micro electromagnetic valve or other valve structure.

[0014] In order to solve the second technical problem, namely, to fully separate the target plankton while reducing the labor intensity of the operators, preferably, a driving source for fully separating the target plankton is also provided on the cylinder, and the driving source is connected to the inlet and / or the screen, thereby oscillating or rotating the inlet and / or the screen. Specifically, for example, this can be achieved by arranging the inlet at the edge of the upper portion of the cylinder and rotating the inlet around the axis of the cylinder; or by oscillating the inlet to change the fluid path; or by rotating or oscillating the screen, etc.

[0015] Furthermore, in order to achieve the purpose of fully separating the target plankton in a relatively simple manner, preferably, the driving source is located outside the cylinder and is connected to the screen through a power output shaft passing through the cylinder, thereby driving the screen to rotate back and forth around the power output shaft within a preset angle α.

[0016] Furthermore, to prevent impurities from leaking out of the edge of the screen, the screen is preferably arranged parallel to the internal cross-section of the cylinder. Accordingly, the preset angle α is -45°≤α≤45° relative to the internal cross-section of the cylinder. This design takes into account that if the rotation angle is too large, unseparated impurities may overflow from the edge of the screen, so the preset angle α is controlled.

[0017] In order to achieve graded concentration, preferably, the screen includes at least a first screen and a second screen arranged from upstream to downstream along the fluid flow path, and the mesh number of the first screen is smaller than that of the second screen.

[0018] In order to enable the driving source to drive the first screen and the second screen, preferably, a mounting portion for mounting the driving source is provided on the outside of the cylinder, the position of the mounting portion corresponds to the first screen and the second screen, and a through hole is provided on the cylinder for the power output shaft of the driving source to pass through.

[0019] The "fluid communication" referred to in the present invention refers to the spatial positional relationship between two components or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path and / or be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. By arranging a collecting member with a collecting space at the downstream end of the cylinder along the flow path of the fluid, and opening a second outflow port at the bottom of the cylinder that is in fluid communication with the collecting space, the target plankton finally collected can be avoided from being transferred a second time, which is more convenient and efficient.

[0022] 2. By setting a driving source on the cylinder, it is possible to fully separate the target plankton while reducing the labor intensity of the operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a graded concentration device in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic cross-sectional view of a graded concentration device in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the explosion structure of the graded concentration device in the embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the partial structure of the cylinder in the embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the screen in the initial state in the embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the screen in the final state in the embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the state of the graded concentration device in the embodiment of the present utility model in a separation state;

[0030] Figure 8 This is a schematic diagram of the state of the grading and concentration device in the embodiment of the present utility model in the collection state. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to specific embodiments.

[0032] like Figures 1 to 4 The figure shows a preferred embodiment of the present invention. Specifically, the grading and concentrating device for plankton in this embodiment includes a cylinder 1, and an inlet 11 for fluid inflow is provided at the upper part of the cylinder 1, a first outlet 12 for fluid outflow is provided at the lower part, and a screen 2 for separating target plankton is also provided below the inlet 11. A collecting member 3 is provided at the downstream end of the flow path of the fluid on the cylinder 1, and the collecting member 3 has a collection space 31 for collecting target plankton. Correspondingly, a second outlet 13 is provided at the bottom of the cylinder 1 in fluid communication with the collection space 31. The first outlet 12 and the second outlet 13 can be opened selectively. When the grading and concentrating device is in a separation state, the first outlet 12 is opened for fluid discharge. When the grading and concentrating device is in a collection state, the second outlet 13 is opened for target plankton to flow into the collection space 31.

[0033] To prevent a large number of target plankton from being discharged with the fluid from the first outlet 12 when the grading and concentrating device is in the separated state, the bottom of the barrel 1 in this embodiment is partially recessed, and the second outlet 13 is located at the lowest point of the recessed bottom of the barrel 1. Correspondingly, the first outlet 12 is located above the second outlet 13. The partially recessed bottom of the barrel 1, the second outlet 13 located at the lowest point of the recessed bottom of the barrel 1, and the first outlet 12 located above the second outlet 13 help temporarily store the target plankton in the recessed area, allowing only overflowing fluid to be discharged from the first outlet 12. This prevents a large number of target plankton from being discharged with the fluid from the first outlet 12 when the grading and concentrating device is in the separated state. Furthermore, to facilitate the discharge of fluid from the first outlet 12 to the outside, the first outlet 12 in this embodiment is located on the sidewall of the barrel 1. Correspondingly, the collecting member 3 and the bottom of the barrel 1 together form a collection space 31. This design, under the premise of meeting the needs, makes the setting of the first flow outlet 12 simpler, and the collecting space 31 becomes an independent space relative to the first flow outlet 12, and the layout is more reasonable. In order to facilitate the removal of the collecting member 3 for direct research on the target plankton, the collecting member 3 in this embodiment is a cylindrical member with an open top, and the collecting member 3 and the cylinder 1 are detachably connected by means of a sleeve or a screw connection. The detachable connection between the collecting member 3 and the cylinder 1 can be achieved relatively simply and reliably by means of a sleeve or a screw connection. For example, in this embodiment, see Figure 3The inner wall of the opening of the collecting member 3 is provided with an internal thread, and the outer portion of the lower portion of the barrel 1 is provided with an external thread, so that the collecting member 3 can be screwed to the barrel 1. In order to selectively open the first flow outlet 12 and the second flow outlet 13, in this embodiment, a valve body 14 is provided in the first flow outlet 12 and the second flow outlet 13 for controlling the opening and closing of the channel.

[0034] Furthermore, in order to fully separate the target plankton and reduce the labor intensity of the operators, a driving source 4 for fully separating the target plankton is also provided on the cylinder 1. The driving source 4 is connected to the inlet 11 and / or the screen 2, thereby oscillating or rotating the inlet 11 and / or the screen 2. Specifically, the driving source 4 in this embodiment is located outside the cylinder 1 and is connected to the screen 2 through the cylinder 1 through the power output shaft 41, thereby driving the screen 2 to rotate back and forth around the power output shaft 41 within a preset angle α. In order to prevent impurities from leaking from the edge of the screen 2, the screen 2 is arranged parallel to the internal cross-section of the cylinder 1. Correspondingly, the preset angle α is -45°≤α≤45° for the screen relative to the internal cross-section of the cylinder. This design is based on the consideration that if the rotation angle is too large, it may cause unseparated impurities to overflow from the edge of the screen 2. Therefore, the preset angle α is controlled. The preset angle α in this embodiment is ±20°. To achieve graded concentration, the screen 2 in this embodiment includes at least a first screen 21 and a second screen 22, arranged along the fluid flow path from upstream to downstream. The mesh size of the first screen 21 is smaller than that of the second screen 22. Furthermore, a mounting portion 15 for mounting the drive source 4 is provided on the exterior of the cylinder 1. The mounting portion 15 is positioned correspondingly to the first and second screens 21, 22. Furthermore, a through hole 16 is provided on the cylinder 1 for the power output shaft 41 of the drive source 4 to pass through.

[0035] The specific working process of the graded concentration device in this embodiment is as follows:

[0036] like Figure 5 As shown, the screen 2 is in the initial state at this time, that is, the screen 2 is parallel to the internal cross-section of the cylinder 1; Figure 6 As shown, the screen 2 is in the final state at this time, that is, the screen 2 and the internal cross-section of the cylinder 1 form a preset angle α, which is 20° in the figure. Subsequently, under the action of the driving source 4, the screen 2 will rotate around the power output shaft 41 to -20°, and repeatedly rotate between the preset angles α; and as shown in FIG. Figure 7As shown, at this time, the grading and concentrating device is in a separated state, the first flow outlet 12 is opened, and the second flow outlet 13 is in a closed state. The overflowed fluid will be discharged to the outside through the first flow outlet 12, and the target plankton will be temporarily stored at the bottom of the cylinder 1; as the grading and concentrating device enters the collection state, the second flow outlet 13 is opened, and the target plankton enters the collection space 31 of the collecting component 3. When the collection is completed, the collecting component 3 can be removed from the cylinder 1 for direct research.

Claims

1. A device for grading and concentrating plankton, comprising a cylinder (1), wherein the upper portion of the cylinder (1) is provided with an inlet (11) for fluid inflow, the lower portion is provided with a first outlet (12) for fluid outflow, and a screen (2) for separating target plankton is further provided below the inlet (11); Its characteristics are: A collecting member (3) is provided on the cylinder (1) at the downstream end along the flow path of the fluid, and the collecting member (3) has a collecting space (31) for collecting target plankton. Correspondingly, a second outflow port (13) is provided at the bottom of the cylinder (1) and is in fluid communication with the collecting space (31); The first outflow port (12) and the second outflow port (13) can be opened selectively. When the grading and concentrating device is in a separation state, the first outflow port (12) is opened to allow fluid to be discharged. When the grading and concentrating device is in a collection state, the second outflow port (13) is opened to allow target plankton to flow into the collection space (31).

2. The fractionation and concentration device according to claim 1, characterized in that: The bottom of the cylinder (1) is partially concave downward, and the second flow outlet (13) is arranged at the lowest point of the concave bottom of the cylinder (1). Correspondingly, the first flow outlet (12) is arranged above the second flow outlet (13).

3. The fractionation and concentration device according to claim 2, characterized in that: The first outflow port (12) is arranged on the side wall of the cylinder (1), and correspondingly, the collecting member (3) and the bottom of the cylinder (1) together surround and form the collecting space (31).

4. The fractionation and concentration device according to claim 3, characterized in that: The collecting member (3) is a cylindrical member with an open upper end, and the collecting member (3) and the cylinder (1) are detachably connected by sleeve connection or screw connection.

5. The fractionation and concentration device according to claim 1, characterized in that: A valve body (14) for controlling channel opening and closing is provided in the first outflow port (12) and the second outflow port (13).

6. The fractionation and concentration device according to any one of claims 1 to 5, characterized in that: A driving source (4) for fully separating target plankton is also provided on the cylinder (1), and the driving source (4) is connected to the inlet (11) and / or the screen (2), thereby oscillating or rotating the inlet (11) and / or the screen (2).

7. The fractionation and concentration device according to claim 6, characterized in that: The driving source (4) is located outside the cylinder (1) and is connected to the screen (2) via a power output shaft (41) passing through the cylinder (1), thereby driving the screen (2) to rotate back and forth around the power output shaft (41) within a preset angle (α).

8. The fractionation and concentration device according to claim 7, characterized in that: The screen (2) is arranged parallel to the internal cross section of the cylinder (1), and correspondingly, the preset angle (α) is -45°≤α≤45° for the screen (2) relative to the internal cross section of the cylinder (1).

9. The fractionation and concentration device according to claim 8, characterized in that: The screen (2) comprises at least a first screen (21) and a second screen (22) arranged along a fluid flow path from upstream to downstream, wherein the mesh number of the first screen (21) is smaller than that of the second screen (22).

10. The fractionation and concentration device according to claim 9, characterized in that: The cylinder (1) is provided with a mounting portion (15) on the outside for mounting the drive source (4), the position of the mounting portion (15) corresponding to the first screen (21) and the second screen (22), and the cylinder (1) is provided with a through hole (16) for the power output shaft (41) of the drive source (4) to pass through.

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