A horizontal screw centrifuge feed device

Abstract

The present application belongs to the technical field of horizontal screw centrifuge, and particularly relates to a horizontal screw centrifuge feeding device, which comprises a main feeding pipe including a first feeding port and a first discharging port; a flocculating agent feeding pipe including a second feeding port and a second discharging port, the flocculating agent feeding pipe being movably connected with the main feeding pipe along a first direction, so that the flocculating agent feeding pipe can be switched between the following stations: station one, in which the second discharging port protrudes inside the pipe wall of the main feeding pipe; and station two, in which the second discharging port is retracted outside the pipe wall of the main feeding pipe. The flocculating agent feeding pipe is arranged in a movable structure, which can be protruded in the main feeding pipe when treating sewage containing small-particle solid-phase substances, so as to ensure uniform mixing of the flocculating agent and the sewage, and can be retracted outside the main feeding pipe when treating sewage containing large-particle solid-phase substances, so as to avoid pipe blockage.

Description

Technical Field

[0001] This invention belongs to the technical field of horizontal screw centrifuges, and specifically relates to a feeding device for a horizontal screw centrifuge. Background Technology

[0002] A horizontal screw centrifuge is a commonly used wastewater solid-liquid separation device. Its main principle is to use centrifugal force to separate solid and liquid phases in wastewater, and then use a screw conveyor to discharge the solid and liquid phases from different outlets, achieving solid-liquid separation. When the solid particles in the wastewater are small, flocculants need to be added to the wastewater to agglomerate the solids and improve the stratification effect. Existing technology, in order to ensure thorough mixing of the flocculant and wastewater, generally places the outlet of the flocculant supply pipe at the center of the wastewater inlet pipe, as disclosed in Chinese invention patent CN 110227610 B. While this method ensures thorough mixing of the flocculant and wastewater, when treating wastewater with high solid content and large solid particles, the flocculant supply pipe can actually hinder wastewater flow and, in severe cases, even cause blockage of the inlet pipe, failing to meet the needs of different application scenarios. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a feeding device for a horizontal screw centrifuge that can adapt to the needs of different scenarios.

[0004] To achieve the above and other related objectives, the present invention provides a feeding device for a horizontal screw centrifuge, comprising:

[0005] The main feed pipe includes a first feed inlet and a first discharge outlet. The first feed inlet is used to connect to a sewage pipe, and the first discharge outlet extends into the screw drum of the horizontal screw centrifuge.

[0006] The flocculant feed pipe includes a second inlet and a second outlet, and is movably connected to the main feed pipe along a first direction, so that the flocculant feed pipe can switch between the following positions:

[0007] Station 1, the second discharge port protrudes from the inner wall of the main feed pipe; and

[0008] Station 2, the second discharge port is constricted to the outside of the main feed pipe wall;

[0009] The first direction is the radial direction of the main feed pipe.

[0010] In an optional embodiment of the present invention, a baffle plate is connected to the second discharge port. The baffle plate is movably connected to the flocculant feed pipe. A linkage mechanism is provided between the baffle plate and the flocculant feed pipe. The linkage mechanism is configured such that when the flocculant feed pipe is located at the first station, the linkage mechanism drives the baffle plate to form a certain angle with the axis of the main feed pipe, and when the flocculant feed pipe is located at the second station, the linkage mechanism drives the baffle plate to be flush with the pipe wall of the main feed pipe.

[0011] In an optional embodiment of the present invention, when the flocculant feed pipe is located at the first station, the baffle is located downstream of the second outlet in the material flow direction of the main feed pipe, and the projection of the second outlet on the axial direction of the main feed pipe is located within the projection area of ​​the baffle on the axial direction of the main feed pipe.

[0012] In an optional embodiment of the present invention, the end of the baffle away from the second discharge port is provided with at least two tail protrusions, and the side of the baffle facing the second discharge port is provided with guide ribs, which are configured to guide the material discharged from the second discharge port to each of the tail protrusions.

[0013] In an optional embodiment of the present invention, the flocculant feed pipe includes a rigid straight pipe, the linkage mechanism includes a movable seat, a transmission rod, a stop block, and an elastic element. The movable seat is movably connected to the main feed pipe along the first direction, the flocculant feed pipe is fixedly connected to the movable seat, the transmission rod is movably connected to the movable seat along the first direction, the stop block is installed on the pipe wall of the main feed pipe, the transmission rod is hinged to the baffle plate, the flocculant feed pipe is slidably hinged to the waist-shaped hole provided on the baffle plate, the elastic element is configured such that its elastic force can drive the transmission rod to move relative to the movable seat towards the center of the main feed pipe, the transmission rod is provided with a first limiting part for preventing the transmission rod from disengaging from the movable seat; the transmission rod is also provided with a second limiting part, the second limiting part is configured such that when the flocculant feed pipe moves from station two to station one, the second limiting part can abut against the stop block, so that the movement stroke of the transmission rod is less than the movement stroke of the flocculant feed pipe.

[0014] In an optional embodiment of the present invention, the second discharge port is disposed on the side wall of the flocculant feed pipe, at least a portion of the outer wall of the transmission rod is in contact with the outer wall of the flocculant feed pipe, and when the flocculant feed pipe is located at the second station, the second discharge port is closed by the transmission rod, and when the flocculant feed pipe is located at the first station, the transmission rod is removed from the outside of the second discharge port.

[0015] In an optional embodiment of the present invention, the baffle is movably connected to the main feed pipe along a first direction, and when the flocculant feed pipe is located at the first station, the inner side of the baffle is flush with the inner wall of the main feed pipe.

[0016] In an optional embodiment of the present invention, a drive mechanism is further included, the drive mechanism being used to drive the movable seat to reciprocate along the first direction.

[0017] In an optional embodiment of the present invention, the driving mechanism includes a lead screw and a driving element. The lead screw is threadedly engaged with the movable seat, the lead screw is rotatably connected to a base disposed on the outer wall of the main feed pipe, and the lead screw is drively connected to the driving element.

[0018] In an optional embodiment of the invention, the driving element includes a motor or a handwheel.

[0019] The technical advantages of this invention are as follows: By designing the flocculant feed pipe as a movable structure, when treating wastewater containing small particulate solids, the flocculant feed pipe can protrude inside the main feed pipe, ensuring uniform mixing of the flocculant and wastewater. Conversely, when treating wastewater containing large particulate solids, the flocculant feed pipe can be retracted outside the main feed pipe, preventing pipe blockage. Therefore, this invention can adapt to the treatment needs of different types of wastewater, thus having a wider range of applications. Attached Figure Description

[0020] Figure 1 A perspective view of the feeding device for a horizontal screw centrifuge provided in an embodiment of the present invention;

[0021] Figure 2 This is an axial view of the feeding device for a horizontal screw centrifuge provided in an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 AA section view;

[0023] Figure 4 yes Figure 3 A magnified view of part of the I;

[0024] Figure 5 yes Figure 4 A magnified view of another state of the area shown;

[0025] Figure 6 This is a perspective view of the linkage mechanism provided in an embodiment of the present invention;

[0026] Figure 7 This is a cross-sectional view of the flocculant feed pipe and transmission rod provided in an embodiment of the present invention. Detailed Implementation

[0027] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] A horizontal screw centrifuge is a device used for solid-liquid separation, widely applied in chemical, pharmaceutical, food, and environmental protection industries. It mainly consists of a casing, a rotating drum, a screw conveyor, a feed inlet, a liquid outlet, a solid outlet, and a drive unit. The casing is the outer shell of the centrifuge, typically made of corrosion-resistant materials and providing a sealing function. The rotating drum is the core component of the centrifuge, with a cylindrical or conical inner cavity for rotating and separating substances. The inner surface of the drum usually has spiral grooves to help the substances move towards the drum wall or outlet under centrifugal force. The screw conveyor rotates coaxially with the drum and is mainly used to transport the settled solids from inside the drum to the solids outlet. The shape and rotation speed of the screw conveyor can be adjusted according to separation requirements. The feed inlet is used to feed materials containing a mixture of solids and liquids into the drum. The liquid outlet is used to discharge the separated liquid. The liquid is forced to move towards the outer wall of the drum under centrifugal force and then discharged from the liquid outlet. The solids outlet is used to discharge the settled solids. The screw conveyor pushes the solids to the solids outlet. The drive unit includes an electric motor and a transmission system for driving the rotation of the drum and screw conveyor.

[0030] The working principle of a horizontal screw centrifuge is as follows: The solid-liquid mixture to be separated enters the drum through the feed inlet. Inside the drum, the mixture is subjected to centrifugal force. The high-speed rotation of the drum generates a strong centrifugal force. Solid particles, due to their higher density, experience a stronger centrifugal force and are forced to move towards the inner wall of the drum. The liquid, due to its lower density, is forced to move towards the center of the drum. The screw conveyor rotates coaxially with the drum, and through the movement of the screw, it pushes the settled solids from the inner wall of the drum to the solids discharge outlet. The liquid, after centrifugal separation, flows in the center of the drum and is discharged through the liquid discharge outlet. The screw conveyor pushes the solids to the solids discharge outlet, and the solid material is discharged from the solids discharge outlet, completing the separation process.

[0031] When the solid particles in wastewater are small, flocculants need to be added to cause the solids to agglomerate, thereby improving the stratification effect. To ensure thorough mixing of the flocculant and wastewater, the outlet of the flocculant supply pipe is typically located in the center of the wastewater inlet pipe. While this method guarantees sufficient mixing, it can actually hinder wastewater flow, potentially causing blockages, especially when treating wastewater with high solid content and large particles. This makes it unsuitable for various application scenarios. Therefore, this invention designs the flocculant supply pipe as a movable structure. When treating wastewater containing small solid particles, the flocculant supply pipe can protrude inside the main inlet pipe, ensuring uniform mixing. When treating wastewater containing large solid particles, the flocculant supply pipe can be retracted outside the main inlet pipe to prevent blockages. Thus, this invention can adapt to the treatment needs of different types of wastewater, broadening its applicability.

[0032] Please see Figure 1-7 As shown, the technical solution of the present invention will be described in detail below with reference to specific embodiments:

[0033] Please see Figure 1-5 As shown, the feeding device for a horizontal screw centrifuge provided in the embodiment of the present invention includes a main feed pipe 10 and a flocculant feed pipe 20; the main feed pipe 10 includes a first inlet 11 and a first outlet 12, the first inlet 11 being used to connect to a sewage pipe, and the first outlet 12 extending into the screw drum of the horizontal screw centrifuge; the flocculant feed pipe 20 includes a second inlet 21 and a second outlet 22, the flocculant feed pipe 20 being movably connected to the main feed pipe 10 along a first direction, so that the flocculant feed pipe 20 can switch between the following positions: position one, the second outlet 22 protruding from the inner side of the pipe wall of the main feed pipe 10; and position two, the second outlet 22 contracting to the outer side of the pipe wall of the main feed pipe 10; the first direction is the radial direction of the main feed pipe 10.

[0034] It should be understood that when the solid particles in the wastewater are large, flocculants are generally not required. The flocculant feed pipe 20 in this invention can move radially along the main feed pipe 10, allowing for flexible adjustment of its position according to the physical properties of the wastewater. When treating wastewater containing small solid particles, the flocculant feed pipe 20 can protrude inside the main feed pipe 10 to ensure uniform mixing of the flocculant and wastewater. When treating wastewater containing large solid particles, the flocculant feed pipe 20 can be retracted outside the main feed pipe 10 to prevent pipe blockage.

[0035] Please see Figure 2-5As shown, in an optional embodiment of the present invention, the second discharge port 22 is connected to a baffle plate 23, the baffle plate 23 is movably connected to the flocculant feed pipe 20, and a linkage mechanism is provided between the baffle plate 23 and the flocculant feed pipe 20. The linkage mechanism is configured such that when the flocculant feed pipe 20 is located at the first station, the linkage mechanism drives the baffle plate 23 to form a certain angle with the axis of the main feed pipe 10, and when the flocculant feed pipe 20 is located at the second station, the linkage mechanism drives the baffle plate 23 to be flush with the pipe wall of the main feed pipe 10.

[0036] It should be understood that when wastewater passes through the baffle 23, turbulence is generated behind the baffle 23, which helps to agitate the flocculant and wastewater, further improving the uniformity of the mixing between the flocculant and wastewater. In this invention, the baffle 23 is configured as a movable structure. When treating wastewater containing small particulate solids, the baffle 23 is suspended in the center of the main feed pipe 10 to agitate the water flow, ensuring uniform mixing of the flocculant and wastewater. When treating wastewater containing large particulate solids, the baffle 23 is flush with the wall of the main feed pipe 10, thus not obstructing the water flow and preventing pipe blockage.

[0037] Please see Figure 2 , 4 As shown in Figure 6, in an optional embodiment of the present invention, when the flocculant feed pipe 20 is located at the first station, in the material flow direction of the main feed pipe 10, the baffle 23 is located downstream of the second discharge port 22, and the projection of the second discharge port 22 in the axial direction of the main feed pipe 10 is located within the projection area of ​​the baffle 23 in the axial direction of the main feed pipe 10. The baffle 23 has at least two tail protrusions 232 at one end away from the second discharge port 22, and a guide rib 233 is provided on the side of the baffle 23 facing the second discharge port 22. The guide rib 233 is configured to guide the material discharged from the second discharge port 22 to each of the tail protrusions 232. After the flocculant is discharged from the second outlet 22, it is first blocked by the baffle 23, and then, guided by the guide ribs 233, it is distributed along the baffle 23 to each tail protrusion 232. Turbulence will be generated at the rear end of the tail protrusion 232. After passing through the tail protrusion 232, the flocculant is fully stirred by the turbulence and then mixed evenly with the sewage.

[0038] Please see Figure 4-6As shown, in an optional embodiment of the present invention, the flocculant feed pipe 20 includes a rigid straight pipe, the linkage mechanism includes a movable seat 32, a transmission rod 33, a stop block 35, and an elastic element 34. The movable seat 32 is movably connected to the main feed pipe 10 along the first direction, the flocculant feed pipe 20 is fixedly connected to the movable seat 32, the transmission rod 33 is movably connected to the movable seat 32 along the first direction, the stop block 35 is installed on the pipe wall of the main feed pipe 10, the transmission rod 33 is hinged to the baffle plate 23, and the flocculant feed pipe 20 is slidably hinged to the waist-shaped hole 231 provided on the baffle plate 23. The elastic element 34 is assembled such that its elastic force can drive the transmission rod 33 to move relative to the movable seat 32 towards the center of the main feed pipe 10. The transmission rod 33 is provided with a first limiting part 331 for preventing the transmission rod 33 from disengaging from the movable seat 32. The transmission rod 33 is also provided with a second limiting part 332, which is configured to abut against the stop block 35 when the flocculant feed pipe 20 moves from station two to station one, so that the movement stroke of the transmission rod 33 is less than the movement stroke of the flocculant feed pipe 20.

[0039] Please see Figure 4 , 5 As shown, the specific working principle of the linkage mechanism is as follows:

[0040] Assuming Figure 5 In its initial state, it switches to... Figure 4 The process in the indicated state is as follows: First, the movable seat 32 is driven downwards. At this time, the transmission rod 33, under the action of the elastic element 34 and the first limiting part 331, follows the movable seat 32 and the flocculant feed pipe 20 downwards synchronously. When the second limiting part 332 abuts against the stop block 35, the transmission rod 33 stops descending, and the flocculant feed pipe 20 can continue to descend a certain distance, thereby creating a certain drop at the lower ends of the two, thus realizing the flipping of the baffle 23. Conversely, from Figure 4 The status shown has switched to Figure 5 The process in the indicated state is as follows: First, the movable seat 32 is driven upward. In the initial stage of the upward movement of the movable seat 32, the transmission rod 33 is kept in place under the action of the elastic element 34, thereby causing the spoiler 23 to flip into a horizontal state. When the first limiting part 331 comes into contact with the movable seat 32, the movable seat 32 moves upward synchronously with the transmission rod 33, thereby causing the spoiler 23 to move upward while maintaining a horizontal state until it closes with the pipe wall of the main feed pipe 10.

[0041] Please see Figure 4 , 5As shown in Figure 7, in an optional embodiment of the present invention, the second discharge port 22 is disposed on the side wall of the flocculant feed pipe 20, and at least a portion of the outer wall of the transmission rod 33 is in contact with the outer wall of the flocculant feed pipe 20. When the flocculant feed pipe 20 is located at the second station, the second discharge port 22 is closed by the transmission rod 33; when the flocculant feed pipe 20 is located at the first station, the transmission rod 33 is removed from the outside of the second discharge port 22. It should be understood that the present invention can open or close the second discharge port 22 during the switching of the attitude of the baffle 23, preventing sewage from seeping into the idle flocculant feed pipe 20.

[0042] Please see Figure 4 , 5 As shown, in an optional embodiment of the present invention, the baffle 35 is movably connected to the main feed pipe 10 along a first direction, and when the flocculant feed pipe 20 is located at the first station, the inner side of the baffle 35 is flush with the inner wall of the main feed pipe 10. It should be understood that, in order to ensure... Figure 5 To ensure the smoothness of the inner wall of the main feed pipe 10 in the shown state, a cavity for accommodating the baffle 23 needs to be opened on the inner wall of the main feed pipe 10. When the baffle 23 moves to the center of the main feed pipe 10, solid matter in the sewage tends to accumulate in the cavity. Therefore, the present invention sets the baffle 35 as a movable structure. When the baffle 23 moves to the center of the main feed pipe 10, the baffle 35 can fill the cavity, thereby ensuring the smoothness of the inner wall of the main feed pipe 10 and preventing the accumulation of dirt.

[0043] Please see Figure 1-5 As shown, in an optional embodiment of the present invention, a drive mechanism is further included. The drive mechanism is used to drive the movable seat 32 to reciprocate along the first direction. The drive mechanism includes a lead screw 31 and a drive element. The lead screw 31 is threadedly engaged with the movable seat 32. The lead screw 31 is rotatably connected to a base 13 disposed on the outer wall of the main feed pipe 10. The lead screw 31 is drive-connected to the drive element. The drive element includes a motor 30 or a handwheel.

[0044] In summary, the present invention sets the flocculant feed pipe 20 into a movable structure. When treating wastewater containing small particulate solids, the flocculant feed pipe 20 can protrude inside the main feed pipe 10 to ensure that the flocculant and wastewater are mixed evenly. When treating wastewater containing large particulate solids, the flocculant feed pipe 20 can be stored outside the main feed pipe 10 to avoid pipe blockage. Furthermore, this invention can adapt to the treatment needs of different types of wastewater and has a wider range of applications. This invention sets the baffle 23 as a movable structure. When treating wastewater containing small particulate solids, the baffle 23 is suspended in the center of the main feed pipe 10 to disturb the water flow and ensure that the flocculant and wastewater are mixed evenly. When treating wastewater containing large particulate solids, the baffle 23 is flush with the pipe wall of the main feed pipe 10 and will not obstruct the water flow, thus avoiding pipe blockage. This invention can open or close the second discharge port 22 during the switching of the baffle 23's posture, preventing wastewater from seeping into the idle flocculant feed pipe 20.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0046] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Claims

1. A feeding device for a horizontal screw centrifuge, characterized in that, include: The main feed pipe includes a first feed inlet and a first discharge outlet. The first feed inlet is used to connect to a sewage pipe, and the first discharge outlet extends into the screw drum of the horizontal screw centrifuge. The flocculant feed pipe includes a second inlet and a second outlet, and is movably connected to the main feed pipe along a first direction, so that the flocculant feed pipe can switch between the following positions: Station 1, the second discharge port protrudes from the inner wall of the main feed pipe; and Station 2, the second discharge port is constricted to the outside of the main feed pipe wall; The first direction is the radial direction of the main feed pipe.

2. The feeding device for a horizontal screw centrifuge according to claim 1, characterized in that, The second discharge port is connected to a baffle plate, which is movably connected to the flocculant feed pipe. A linkage mechanism is provided between the baffle plate and the flocculant feed pipe. The linkage mechanism is configured such that when the flocculant feed pipe is located at station one, the linkage mechanism drives the baffle plate to form a certain angle with the axis of the main feed pipe, and when the flocculant feed pipe is located at station two, the linkage mechanism drives the baffle plate to be flush with the pipe wall of the main feed pipe.

3. The feeding device for a horizontal screw centrifuge according to claim 2, characterized in that, When the flocculant feed pipe is located at station one, in the material flow direction of the main feed pipe, the baffle is located downstream of the second discharge port, and the projection of the second discharge port on the axial direction of the main feed pipe is located within the projection area of ​​the baffle on the axial direction of the main feed pipe.

4. The feeding device for a horizontal screw centrifuge according to claim 3, characterized in that, The spoiler has at least two tail protrusions at one end away from the second discharge port, and the spoiler has guide ribs on the side facing the second discharge port. The guide ribs are configured to guide the material discharged from the second discharge port to each of the tail protrusions.

5. The feeding device for a horizontal screw centrifuge according to claim 2, characterized in that, The flocculant feed pipe includes a rigid straight pipe. The linkage mechanism includes a movable seat, a transmission rod, a stop block, and an elastic element. The movable seat is movably connected to the main feed pipe along the first direction. The flocculant feed pipe is fixedly connected to the movable seat. The transmission rod is movably connected to the movable seat along the first direction. The stop block is installed on the pipe wall of the main feed pipe. The transmission rod is hinged to the baffle plate. The flocculant feed pipe is slidably hinged to the waist-shaped hole provided on the baffle plate. The elastic element is configured such that its elastic force can drive the transmission rod to move relative to the movable seat towards the center of the main feed pipe. The transmission rod is provided with a first limiting part for preventing the transmission rod from disengaging from the movable seat. The transmission rod is also provided with a second limiting part. The second limiting part is configured to abut against the stop block during the movement of the flocculant feed pipe from station two to station one, so that the movement stroke of the transmission rod is less than the movement stroke of the flocculant feed pipe.

6. The feeding device for a horizontal screw centrifuge according to claim 5, characterized in that, The second discharge port is located on the side wall of the flocculant feed pipe. At least part of the outer wall of the transmission rod is in contact with the outer wall of the flocculant feed pipe. When the flocculant feed pipe is located at the second station, the second discharge port is closed by the transmission rod. When the flocculant feed pipe is located at the first station, the transmission rod is removed from the outside of the second discharge port.

7. The feeding device for a horizontal screw centrifuge according to claim 5, characterized in that, The baffle is movably connected to the main feed pipe along the first direction, and when the flocculant feed pipe is located at the first station, the inner side of the baffle is flush with the inner wall of the main feed pipe.

8. The feeding device for a horizontal screw centrifuge according to claim 5, characterized in that, It also includes a drive mechanism for driving the movable seat to reciprocate along the first direction.

9. The feeding device for a horizontal screw centrifuge according to claim 8, characterized in that, The drive mechanism includes a lead screw and a drive element. The lead screw is threadedly engaged with the movable seat, and the lead screw is rotatably connected to a base provided on the outer wall of the main feed pipe. The lead screw is also connected to the drive element for transmission.

10. The feeding device for a horizontal screw centrifuge according to claim 9, characterized in that, The driving element includes a motor or a handwheel.

Images