Gear-driven three-screw pump

Abstract

This invention provides a gear-driven three-screw pump, comprising a pump body, a filter cartridge, and a cleaning structure. The pump body has an inlet chamber and an inlet port communicating with the inlet chamber; the filter cartridge has a cylindrical cavity with one end open; the filter cartridge is mounted on the pump body, with its end away from the open end extending into the inlet chamber through the inlet port; the cleaning structure is slidably disposed within the cylindrical cavity along its axial direction, and has a cleaning part that contacts the side wall of the cylindrical cavity. The cleaning structure removes impurities from the cylindrical cavity as the cleaning part moves from the bottom of the cylindrical cavity outwards. The gear-driven three-screw pump provided by this invention uses a filter cartridge for filtration, and the filter cartridge has a relatively stable structure. Simultaneously, a cleaning structure is provided within the cylindrical cavity, and the cleaning structure has a cleaning part that carries away impurities from the cylindrical cavity as it moves from the bottom of the cylindrical cavity outwards, thereby removing impurities from the cylindrical cavity. This eliminates the need for disassembling and assembling the filter cartridge, saving time and effort and improving work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of three-screw pump technology, specifically relating to a gear-driven three-screw pump. Background Technology

[0002] A screw pump is a rotary pump that transports or pressurizes liquids by utilizing the meshing space formed by the pump body and the screw, through changes in volume and movement. Screw pumps are classified by the number of screws, such as single-screw pumps and multi-screw pumps. In a multi-screw pump, when the driving screw rotates, it drives the driven screw meshing with it to rotate as well. The volume of the screw meshing space at the suction end gradually increases, and the pressure decreases. Liquid enters the meshing space under the pressure difference. When the volume reaches its maximum, forming a sealed cavity, the liquid continuously moves axially within each sealed cavity until it reaches the discharge end. At this point, the volume of the screw meshing space at the discharge end gradually decreases, and the liquid is discharged.

[0003] In existing technologies, when a screw pump is in use, if there are impurities in the liquid being pumped by the screw, these impurities can enter the screw and easily damage it due to its high-speed rotation, thus affecting its service life. Therefore, a filter screen is usually installed at the screw pump's inlet. However, the filter screen has low structural strength, and regular cleaning involves disassembling and reassembling it, a time-consuming and labor-intensive process with low efficiency and poor practicality. Utility Model Content

[0004] This utility model provides a gear-driven three-screw pump, which aims to solve the problem that the cleaning process of the filter screen at the liquid inlet of the screw pump in the prior art requires disassembly and reassembly, which is time-consuming and labor-intensive.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a gear-driven three-screw pump, comprising:

[0006] The pump body has an inlet chamber and an inlet port communicating with the inlet chamber;

[0007] A filter cartridge has a cylindrical cavity with one end open; the filter cartridge is mounted on the pump body, and the end away from the open end extends into the inlet cavity through the inlet port;

[0008] A cleaning structure is slidably disposed in the cavity along the axial direction of the cavity, and has a cleaning part that contacts the side wall of the cavity. The cleaning structure is used to remove impurities in the cavity as the cleaning part moves outward from the bottom of the cavity.

[0009] In one possible implementation, the filter cartridge includes:

[0010] The cylindrical body has a number of evenly distributed filter holes on its side walls and bottom plate;

[0011] A connecting ring is connected to the cylinder body. The connecting ring is located on the side of the cylinder body away from the bottom plate. The connecting ring is provided with a plurality of mounting holes that are arranged annularly around the axis of the filter cylinder.

[0012] In one possible implementation, the cleanup structure includes:

[0013] A movable plate is slidably disposed in the cylinder cavity along the axial direction of the filter cylinder. The movable plate is provided with multiple through holes, each of which corresponds to a filter hole on the bottom plate of the cylinder. The movable plate is the cleaning part.

[0014] The slide bar is provided in at least two, and each slide bar is spaced apart around the axis of the moving plate at the edge of the moving plate;

[0015] The inner wall of the filter cartridge is provided with a sliding groove that is adapted to each of the sliding rods.

[0016] In one possible implementation, each of the slide bars is provided with a locking block, and the connecting ring is provided with a locking groove that is adapted to each of the locking blocks.

[0017] In one possible implementation, a sealing ring is provided between the connecting ring and the pump body.

[0018] In one possible implementation, the gear-driven three-screw pump further includes an auxiliary support structure; the auxiliary support structure includes:

[0019] An auxiliary plate is disposed on the side of the filter cartridge away from the opening;

[0020] Multiple support rods are provided, and each support rod is arranged circumferentially around the axis of the filter cylinder. One end of each support rod is connected to the auxiliary plate, and the other end is connected to the connecting ring.

[0021] In one possible implementation, a gap is provided between each of the support rods and the filter cartridge.

[0022] In one possible implementation, the diameter of the auxiliary plate is smaller than the diameter of the liquid inlet.

[0023] The advantages of the gear-driven three-screw pump provided by this utility model are as follows: Compared with the prior art, by setting a filter cartridge, the filter cartridge has a cavity with one end open. The pump body has an inlet cavity and an inlet port communicating with the inlet cavity. The filter cartridge is set on the pump body, and the end of the filter cartridge away from the open end extends into the inlet cavity through the inlet port, so that the liquid to be transported enters the inlet cavity through the filter cartridge and is filtered by the filter cartridge. The filter cartridge used in this application has a relatively stable structure. At the same time, a cleaning structure is also provided in the cavity. The cleaning structure is slidably set in the cavity along the axial direction of the cavity. The cleaning structure has a cleaning part that contacts the side wall of the cavity. As the cleaning part moves from the bottom of the cavity outward, it carries out the impurities in the cavity, thereby removing the impurities in the cavity. This eliminates the process of disassembling and assembling the filter cartridge, saving time and effort and improving work efficiency. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of the gear-driven three-screw pump provided in this embodiment of the utility model;

[0025] Figure 2 A schematic diagram showing the fit between the filter cartridge and the auxiliary support structure of the gear-driven three-screw pump provided in an embodiment of this utility model;

[0026] Figure 3 A schematic diagram showing the interaction between the filter cartridge, cleaning structure, and auxiliary support structure of the gear-driven three-screw pump provided in this embodiment of the utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10. Pump body; 11. Driving screw; 12. Driven screw; 13. Inlet chamber; 20. Filter cartridge; 21. Cylinder; 211. Filter hole; 212. Slide groove; 22. Connecting ring; 221. Mounting hole; 30. Cleaning structure; 31. Moving plate; 32. Slide rod; 40. Auxiliary support structure; 41. Auxiliary plate; 42. Support rod. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", and "tail" indicate the orientation or positional relationship 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 do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0033] Please refer to the following: Figures 1 to 3 The gear-driven three-screw pump provided by this utility model will now be described. The gear-driven three-screw pump includes a pump body 10, a filter cartridge 20, and a cleaning structure 30. The pump body 10 has an inlet chamber 13 and an inlet port communicating with the inlet chamber 13. The filter cartridge 20 has a cylindrical cavity, one end of which is open. The filter cartridge 20 is mounted on the pump body 10, and the end of the filter cartridge 20 away from the open end extends into the inlet chamber 13 through the inlet port. The cleaning structure 30 is slidably disposed in the cylindrical cavity along the axial direction of the cylindrical cavity. The cleaning structure 30 has a cleaning part that contacts the side wall of the cylindrical cavity, and the cleaning structure 30 is used to remove impurities in the cylindrical cavity as the cleaning part moves from the bottom of the cylindrical cavity outwards.

[0034] In this embodiment, the pump body 10 has an inlet chamber 13 and an inlet port, the inlet port being connected to the inlet chamber 13. The filter cartridge 20 has a cylindrical cavity, one end of which is open. The filter cartridge 20 is mounted on the pump body 10, and the end of the filter cartridge 20 away from the open end extends into the inlet chamber 13 through the inlet port. The cleaning structure 30 is slidably disposed in the cylindrical cavity along the axial direction of the cylindrical cavity. The cleaning structure 30 has a cleaning part that contacts the side wall of the cylindrical cavity. As the cleaning part moves outward from the bottom of the cylindrical cavity, it carries out impurities from the cylindrical cavity, thereby removing impurities from the cylindrical cavity.

[0035] The gear-driven three-screw pump provided in this embodiment of the utility model, compared with the prior art, features a filter cartridge 20 with a cylindrical cavity, one end of which is open. The pump body 10 has an inlet chamber 13 and an inlet port communicating with the inlet chamber 13. The filter cartridge 20 is mounted on the pump body 10, and the end of the filter cartridge 20 away from the open end extends into the inlet chamber 13 through the inlet port, allowing the liquid to be transported to enter the inlet chamber 13 through the filter cartridge 20 for filtration. The filter cartridge 20 used in this application provides a relatively stable structure. A cleaning structure 30 is also provided in the cylindrical cavity, sliding along the axial direction of the cavity. The cleaning structure 30 has a cleaning part that contacts the side wall of the cylindrical cavity. As the cleaning part moves outward from the bottom of the cavity, it carries out impurities from the cavity, thus removing impurities and eliminating the need for disassembling and assembling the filter cartridge 20, saving time and effort and improving work efficiency.

[0036] In some embodiments, please refer to Figure 1 The gear-driven three-screw pump includes one driving screw 11 and two driven screws 12. Gears are installed on the driving screw 11 and the two driven screws 12, and the gears mesh to drive the pump. The motor power is transmitted to the shaft of the driving screw 11 through a coupling, and then precisely and synchronously transmitted to the shafts of the two driven screws 12 through the gears. Since the helical tooth profiles of each screw are conjugate, they together with the inner wall of the pump casing form a series of sealed, non-communicating chambers. When the screws rotate, these sealed chambers are formed at the inlet end of the pump body 10 and gradually increase in size, creating a vacuum and drawing in the medium. As the screws continue to rotate, these sealed chambers filled with the medium are smoothly and undisturbedly pushed towards the discharge end along the axial direction of the filter cartridge 20, like "nuts." At the discharge end, the chamber volume gradually decreases, continuously and uniformly expelling the medium from the pump body 10.

[0037] In some embodiments, please refer to Figure 2 and Figure 3The filter cartridge 20 includes a cylinder 21 and a connecting ring 22. The sidewall and bottom plate of the cylinder 21 have a plurality of evenly distributed filter holes 211. The connecting ring 22 is connected to the cylinder 21 and is located on the side of the cylinder 21 away from the bottom plate. The connecting ring 22 has a plurality of mounting holes 221 arranged annularly around the axis of the filter cartridge 20. In this embodiment, the sidewall and bottom plate of the cylinder 21 have a plurality of filter holes 211, which are evenly distributed. The side of the cylinder 21 away from the bottom plate is open. The connecting ring 22 is connected to the cylinder 21 and is located on the side of the cylinder 21 away from the bottom plate, i.e., the connecting ring 22 is located at the open end of the cylinder 21. The connecting ring 22 has a plurality of mounting holes 221, which are arranged annularly around the axis of the filter cartridge 20.

[0038] Furthermore, when the filter cartridge 20 is installed onto the pump body 10, the locking member passes through each mounting hole 221 and locks the filter cartridge 20 onto the pump body 10.

[0039] In some embodiments, please refer to Figure 2 and Figure 3 The cleaning structure 30 includes a movable plate 31 and sliding rods 32. The movable plate 31 is slidably disposed in the cylinder cavity along the axial direction of the filter cylinder 20. The movable plate 31 has multiple through holes, each corresponding to a filter hole 211 on the bottom plate of the cylinder 21. The movable plate 31 is the cleaning part. At least two sliding rods 32 are provided, each arranged at intervals around the edge of the movable plate 31 along its axis. The inner wall of the filter cylinder 20 has sliding grooves 212 adapted to each sliding rod 32. In this embodiment, the movable plate 31 has multiple through holes, each corresponding to a filter hole 211 on the bottom plate of the cylinder 21. Thus, when liquid is introduced into the liquid inlet chamber 13 through the filter cylinder 20, the movable plate 31 can filter the liquid. If there are impurities, they remain on the end face of the movable plate 31. The movable plate 31 is slidably disposed in the cylinder cavity along the axial direction of the filter cylinder 20. At least two sliding rods 32 are arranged at intervals around the axial direction of the movable plate 31. Each sliding rod 32 is disposed on the edge of the movable plate 31. When there are many impurities in the filter cylinder 20, by pulling each sliding rod 32, each sliding rod 32 drives the movable plate 31 to slide along the axial direction of the filter cylinder 20, thereby exporting the impurities in the filter cylinder 20 through the movable plate 31, eliminating the need to disassemble the filter cylinder 20, saving time and effort, and making operation convenient.

[0040] In some embodiments, please refer to Figure 2 and Figure 3 Each slide bar 32 is equipped with a locking block, and the connecting ring 22 is equipped with a locking groove that matches each locking block. In this embodiment, when impurity cleaning is not required, the locking block is engaged in the locking groove. When impurity cleaning is required, the locking block is pulled to move the slide bar 32 and the moving plate 31.

[0041] In some embodiments, please refer to Figure 1 A sealing ring is provided between the connecting ring 22 and the pump body 10 to ensure the sealing of the connection between the pump body 10 and the filter cartridge 20.

[0042] In some embodiments, please refer to Figure 2 and Figure 3 The gear-driven three-screw pump provided in this embodiment of the present invention also includes an auxiliary support structure 40. The auxiliary support structure 40 includes an auxiliary plate 41 and support rods 42. The auxiliary plate 41 is disposed on the side of the filter cartridge 20 away from the open end. Multiple support rods 42 are provided, each arranged annularly around the axis of the filter cartridge 20 at intervals on its outer periphery. One end of each support rod 42 is connected to the auxiliary plate 41, and the other end is connected to the connecting ring 22. In this embodiment, the auxiliary plate 41 is disposed on the side of the filter cartridge 20 away from the open end, and multiple support rods 42 are disposed between the auxiliary plate 41 and the connecting ring 22. One end of each support rod 42 is connected to the auxiliary plate 41, and the other end is connected to the connecting ring 22. The fact that each support rod 42 is arranged annularly around the axis of the filter cartridge 20 at intervals on its outer periphery prevents deformation of the filter cartridge 20 body 21 during prolonged use, thereby enhancing the structural stability of the filter cartridge 20.

[0043] In some embodiments, please refer to Figure 2 and Figure 3 Each support rod 42 is spaced apart from the filter cartridge 20, so that each support rod 42 will not block the filter holes 211 on the filter cartridge 20, thus ensuring the filtration performance of each filter hole 211.

[0044] In some embodiments, please refer to Figure 1 The diameter of the auxiliary plate 41 is smaller than that of the liquid inlet, which makes it easier to insert the filter cartridge 20 into the liquid inlet chamber 13 through the liquid inlet.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gear-driven tri-screw pump characterized in that, include: The pump body has an inlet chamber and an inlet port communicating with the inlet chamber; A filter cartridge with a cylindrical cavity that is open at one end; The filter cartridge is mounted on the pump body, and the end furthest from the opening extends into the inlet chamber through the inlet port; A cleaning structure is slidably disposed in the cavity along the axial direction of the cavity, and has a cleaning part that contacts the side wall of the cavity. The cleaning structure is used to remove impurities in the cavity as the cleaning part moves outward from the bottom of the cavity.

2. The gear-driven three-screw pump of claim 1, wherein, The filter cartridge includes: The cylindrical body has a number of evenly distributed filter holes on its side walls and bottom plate; A connecting ring is connected to the cylinder body. The connecting ring is located on the side of the cylinder body away from the bottom plate. The connecting ring is provided with a plurality of mounting holes that are arranged annularly around the axis of the filter cylinder.

3. The gear-driven three-screw pump of claim 2, wherein, The cleanup structure includes: A movable plate is slidably disposed in the cylinder cavity along the axial direction of the filter cylinder. The movable plate is provided with multiple through holes, each of which corresponds to a filter hole on the bottom plate of the cylinder. The movable plate is the cleaning part. The slide bar is provided in at least two, and each slide bar is spaced apart around the axis of the moving plate at the edge of the moving plate; The inner wall of the filter cartridge is provided with a sliding groove that is adapted to each of the sliding rods.

4. The gear-driven three-screw pump of claim 3, wherein, Each of the slide bars is provided with a locking block, and the connecting ring is provided with a locking groove that is adapted to each of the locking blocks.

5. The gear-driven three-screw pump of claim 2, wherein, A sealing ring is provided between the connecting ring and the pump body.

6. The gear-driven three-screw pump of claim 2, wherein, The gear-driven three-screw pump also includes an auxiliary support structure; the auxiliary support structure includes: An auxiliary plate is disposed on the side of the filter cartridge away from the opening; Multiple support rods are provided, and each support rod is arranged circumferentially around the axis of the filter cylinder. One end of each support rod is connected to the auxiliary plate, and the other end is connected to the connecting ring.

7. A gear-driven tri-axial screw pump as claimed in claim 6, wherein, A gap is provided between each of the support rods and the filter cartridge.

8. The gear-driven three-screw pump of claim 6, wherein, The diameter of the auxiliary plate is smaller than the diameter of the liquid inlet.

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