A jet device for shellfish harvesting

Abstract

This invention provides an ejector device for shellfish harvesting, belonging to the technical field of shellfish harvesting devices. It solves the technical problem of low shellfish suction efficiency in existing ejector devices. This jet device includes an inlet pipe and an outlet pipe, which are linearly and fixedly connected by an expansion pipe. A suction tube is fixedly connected to the side wall of the expansion pipe, with one end extending outside the expansion pipe and the other end inside the expansion pipe and extending towards the outlet pipe. A spiral plate is fixedly connected between the suction tube and the outlet pipe. Gas enters between the suction tube and the outlet pipe from the expansion pipe, where the flow velocity and pressure increase. The gas then passes through a spiral channel formed by the spiral plate, improving flow efficiency. After entering the outlet pipe at the end away from the horizontal pipe, the flow velocity slows down, and the pressure increases. The end of the suction tube inside the outlet pipe creates a vacuum, sucking up the mixture of mud, water, and shells, reducing damage to the shellfish and improving harvesting efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of shellfish harvesting devices, specifically referring to a jetting device for shellfish harvesting. Background Technology

[0002] Due to the high labor intensity, low efficiency, and high cost of manual labor, mechanization is a major trend in shellfish harvesting on mudflats. The core of mechanization is how to harvest the shellfish. Whether digging or shoveling, mechanical methods inevitably encounter two problems: one is the breakage rate; the other is that the equipment is large, powerful, and expensive, making it inflexible for small pond operations and prohibitively expensive for farmers. High-pressure water jet technology, through precise control of water pressure and flow direction, disperses the mud and sand surrounding the shellfish, exposing them naturally. A shellfish harvesting device, such as the one described in application number 202411438610X, then extracts the mud-shell mixture. This device forms a compression section and a throat between the main component and the harvesting component, and a diffuser section at the main component. The pressure changes of the kinetic water flow through these sections generate a suction force, drawing the shellfish through the harvesting component. During harvesting, the shellfish move along the pipe without contacting blades or other moving parts, effectively reducing damage to the shellfish and preventing abrasion and impact. However, the kinetic water flow in this structure tends to create turbulence after mixing in the diffuser section, thus reducing the harvesting efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a jetting device for shellfish harvesting. The technical problem this invention aims to solve is how to reduce damage to shellfish and improve harvesting efficiency.

[0004] The objective of this invention can be achieved through the following technical solution: A jetting device for shellfish harvesting includes an inlet pipe and an outlet pipe, which are linearly and fixedly connected by an expansion pipe. A suction pipe is fixedly connected to the side wall of the expansion pipe, with one end extending outside the expansion pipe and the other end inside the expansion pipe and extending towards the outlet pipe. A spiral plate is fixedly connected between the suction pipe and the outlet pipe. Gas enters from the expansion pipe between the suction pipe and the outlet pipe, where the flow velocity and pressure increase. The gas then passes through a spiral channel formed by the spiral plate, improving flow efficiency. After entering the outlet pipe at the end furthest from the horizontal pipe, the flow velocity slows down and the pressure increases. The end of the suction pipe located inside the outlet pipe creates a vacuum, sucking up the mixture of mud, water, and shells, reducing damage to the shellfish and improving harvesting efficiency.

[0005] Furthermore, the suction tube is integrally formed with a horizontal tube and an inclined tube, the included angle between the horizontal tube and the inclined tube is greater than 90 degrees, the horizontal tube is located inside the air outlet tube, one end of the inclined tube extends out of the expansion tube and the other end is located inside the expansion tube, and the inclined tube is welded and fixed to the expansion tube.

[0006] Furthermore, the spiral plate consists of at least two circumferentially distributed guide plates fixed to the outer circumference of the horizontal pipe. The circumferential distribution of the guide plates causes the fluid to form a spiral flow, increasing the stability of the fluid and reducing turbulence.

[0007] Furthermore, the guide vanes are arranged in groups of 4-6 around the outer circumference of the horizontal pipe, and three groups of guide vanes are sequentially arranged along the axial direction of the outer circumference of the horizontal pipe. Multiple groups of guide vanes are arranged along the axial direction of the horizontal pipe to guide the fluid in layers, gradually reducing turbulence and improving efficiency.

[0008] Furthermore, there is only one spiral plate, which is welded and fixed to the horizontal pipe. The single spiral plate guides the flow as a whole, making the fluid rotate more evenly, avoiding interference between different guide plates, and reducing turbulence.

[0009] Furthermore, the diameter of the expansion tube is larger than the diameters of the inlet and outlet tubes.

[0010] Furthermore, the expansion tube and the intake tube are fixedly connected by a conical tube.

[0011] Furthermore, the expansion tube and the outlet tube are fixedly connected by an inclined conical tube, with one end of the spiral plate infinitely close to the other end of the inclined conical tube. The expansion tube is connected to the inlet tube and the outlet tube respectively through a conical tube and an inclined conical tube. The gradual structure can reduce the turbulence caused by sudden changes in cross-section, allowing the gas to transition smoothly and maintain a laminar flow state, thereby reducing energy loss and improving adsorption efficiency.

[0012] Compared with existing technologies, the technical advantages of this invention are as follows: The diameter of the expansion tube is larger than that of the outlet tube. Gas enters the space between the horizontal tube and the outlet tube through the tapered tube with a reduced diameter from the expansion tube, increasing the flow velocity and pressure. The gas then passes through a spiral flow channel, further improving flow efficiency, and enters the outlet tube at the end furthest from the horizontal tube, where the flow velocity slows down and the pressure increases. The suction tube, located inside the outlet tube, creates a vacuum to draw in the mixture of mud, water, and shells. This device reduces damage to shellfish and improves harvesting efficiency. The spiral water flow formed in the outlet tube reduces direct friction between the water and the tube wall through rotational motion, creating a rolling-like flow pattern that reduces energy loss and increases water speed and flow rate, thereby improving suction efficiency. Attached Figure Description

[0013] Figure 1 This is a perspective view of the utility model.

[0014] Figure 2 This is a cross-sectional view of the present invention.

[0015] Figure 3 This is a three-dimensional view of the suction tube and spiral plate of this utility model.

[0016] Drawing number markings: 1. Inlet pipe; 2. Outlet pipe; 3. Expansion pipe; 4. Conical pipe; 5. Inclined conical pipe; 6. Suction pipe; 601. Horizontal pipe; 602. Inclined pipe; 7. Spiral plate; 701. Guide plate. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] according to Figures 1 to 3 As shown, a jetting device for shellfish harvesting includes an inlet pipe 1 and an outlet pipe 2. The inlet pipe 1 connects to a high-speed airflow. The inlet pipe 1 and the outlet pipe 2 are linearly and fixedly connected by an expansion pipe 3. The inlet pipe 1, expansion pipe 3, and outlet pipe 2 are sequentially connected in a straight line. A suction pipe 6 is fixedly connected to the side wall of the expansion pipe 3. One end of the suction pipe 6 extends outside the expansion pipe 3, while the other end is inside the expansion pipe 3 and extends towards the outlet pipe 2. A spiral plate 7 is fixedly connected between the suction pipe 6 and the outlet pipe 2. The end of the suction pipe 6 extending outside the expansion pipe 3 is used to suck up shellfish. The diameter of the expansion pipe 3 is larger than the diameters of the inlet pipe 1 and the outlet pipe 2. The expansion pipe 3 and the inlet pipe 1 are fixedly connected by a conical pipe 4. The expansion pipe 3 and the outlet pipe 2 are fixedly connected by an inclined conical pipe 5, with one end of the spiral plate 7 infinitely close to one end of the inclined conical pipe 5. The expansion pipe 3 is connected to the inlet pipe 1 and the outlet pipe 2 through the conical pipe 4 and the oblique conical pipe 5 respectively. The gradual structure can reduce the turbulence caused by sudden cross-sectional changes, so that the gas transitions smoothly and maintains a laminar flow state, thereby reducing energy loss and improving the adsorption efficiency.

[0020] The suction tube 6 is integrally formed with a horizontal tube 601 and an inclined tube 602, with an angle greater than 90 degrees between them. The horizontal tube 601 is located inside the outlet tube 2, and one end of the inclined tube 602 extends outside the expansion tube 3 while the other end is located inside the expansion tube 3. The inclined tube 602 is welded and fixed to the expansion tube 3. The spiral plate 7 consists of at least two circumferentially distributed guide plates 701 fixed around the outer periphery of the horizontal tube 601. The circumferential distribution of the guide plates 701 causes the fluid to form a spiral flow, increasing the stability of the fluid and reducing turbulence. The guide plates 701 are arranged in groups around the outer periphery of the horizontal tube 601, with 4-6 guide plates 701 in each group. Three groups of guide plates 701 are arranged sequentially along the axial direction around the outer periphery of the horizontal tube 601. The multiple groups of guide plates 701 are arranged along the axial direction of the horizontal tube 601, guiding the fluid in layers, gradually reducing turbulence, and improving efficiency.

[0021] The diameter of the expansion tube 3 is larger than that of the outlet tube 2. Gas enters from the expansion tube 3 through the tapered tube 5 with a reduced diameter and enters between the horizontal tube 601 and the outlet tube 2. The flow velocity increases and the pressure increases. The gas then passes through a spiral flow channel to improve the flow efficiency and enters the outlet tube 2 at the end away from the horizontal tube 601. The flow velocity slows down and the pressure increases. The suction tube 6, located at the end inside the outlet tube 2, forms a vacuum to suck up the mixture of mud, water and shells. This device reduces damage to shellfish and improves shellfish harvesting efficiency.

[0022] The spiral plate 7 can also be a single piece, welded and fixed to the horizontal pipe 601. A single spiral plate 7 guides the flow as a whole, making the fluid rotate more evenly, avoiding interference between different guide plates 701, and reducing turbulence.

[0023] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A fluidic device for shellfish harvesting, characterized by: It includes an air inlet pipe (1) and an air outlet pipe (2). The air inlet pipe (1) and the air outlet pipe (2) are directly and fixedly connected by an expansion pipe (3). A suction pipe (6) is fixedly connected to the side wall of the expansion pipe (3). One end of the suction pipe (6) extends out of the expansion pipe (3) and the other end is located inside the expansion pipe (3) and extends towards the air outlet pipe (2). A spiral plate (7) is fixedly connected between the suction pipe (6) and the air outlet pipe (2).

2. The fluidic device for harvesting shellfish according to claim 1, wherein: The suction tube (6) is integrally formed with a horizontal tube (601) and an inclined tube (602). The angle between the horizontal tube (601) and the inclined tube (602) is greater than 90 degrees. The horizontal tube (601) is located inside the air outlet tube (2). One end of the inclined tube (602) extends out of the expansion tube (3) and the other end is located inside the expansion tube (3). The inclined tube (602) is welded and fixed to the expansion tube (3).

3. A jetting device for shellfish harvesting according to claim 2, characterized in that: The spiral plate (7) consists of at least two guide plates (701) that are circumferentially distributed and fixed on the outer periphery of the horizontal pipe (601).

4. A fluidic device for harvesting shellfish according to claim 3, wherein: The guide plates (701) are arranged in groups around the outer periphery of the horizontal pipe (601), with 4-6 guide plates (701) in each group. Three groups of guide plates (701) are arranged sequentially along the axial direction on the outer periphery of the horizontal pipe (601).

5. The fluidic device for harvesting shellfish of claim 1, wherein: There is only one spiral plate (7), which is welded and fixed to the horizontal pipe (601).

6. The fluidic device for harvesting shellfish according to any one of claims 1 to 5, wherein: The diameter of the expansion tube (3) is larger than the diameter of the inlet tube (1) and the outlet tube (2).

7. A fluidic device for harvesting shellfish according to claim 6, wherein: The expansion tube (3) and the air inlet tube (1) are fixedly connected by a conical tube (4).

8. The fluidic device for harvesting shellfish of claim 6, wherein: The expansion tube (3) and the air outlet tube (2) are fixedly connected by the inclined cone tube (5), and one end of the spiral plate (7) is infinitely close to one end of the inclined cone tube (5).

Images