A high-pressure heavy-load type double screw pump

Abstract

This utility model discloses a high-pressure, heavy-duty twin-screw pump, relating to the field of fluid transport equipment technology. The high-pressure, heavy-duty twin-screw pump includes a pump body with an inlet fixedly connected to its front end and an outlet fixedly connected to its top end. The pump body has a hollow internal structure with open ends. A rear bearing assembly is located at the left end of the pump body, and a front bearing assembly is located at the right end. A bushing is fixedly connected inside the pump body, with a variable-diameter inner hole and tapered ends. A double-helix structure is installed inside the bushing. This high-pressure, heavy-duty twin-screw pump forms a closed transport space using the bushing. The variable-diameter inner hole of the bushing cooperates with the double-helix to form a continuous sealed chamber when the screw rotates. The front and rear bearing assemblies provide support for the double-helix. As the double-helix rotates, the fluid is pushed from the inlet side towards the outlet and finally discharged through the outlet. The variable-diameter structure also reduces medium backflow and improves transport efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport equipment technology, and in particular to a high-pressure heavy-duty twin-screw pump. Background Technology

[0002] In the field of fluid transportation in industrial production, twin-screw pumps are widely used in industries such as petroleum, chemical, shipbuilding, and power due to their advantages such as stable flow rate and wide range of applicable media viscosity. In these industries, some operating conditions place extremely high demands on pump performance, requiring continuous operation under high pressure and heavy load conditions. However, when facing such operating conditions, existing twin-screw pumps rely solely on bearings at both ends for screw support. This can easily lead to significant deflection due to excessive force, resulting in uneven clearance between the screw and bushing, causing friction and wear. This not only reduces volumetric efficiency but also shortens equipment lifespan, making it difficult to meet the stable operation requirements of high-pressure and heavy-load scenarios.

[0003] Existing twin-screw pumps have several shortcomings under high-pressure and heavy-load conditions: the bearings are mostly of a single type, which cannot withstand large radial and axial forces simultaneously, making them prone to wear, overheating, and even damage, affecting the normal operation of the pump; the sealing structure is simple and cannot withstand the impact of high-pressure fluids, making leakage easy, which not only reduces the conveying efficiency but may also cause environmental pollution or even safety accidents due to media leakage; the bushing inner hole structure and screw tooth profile design are unreasonable, resulting in poor sealing performance, easy media backflow under high pressure, and low volumetric efficiency. These problems limit the applicability of existing twin-screw pumps under high-pressure and heavy-load conditions, making the development of twin-screw pumps adapted to these conditions an urgent need in the industry. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a solution that can solve the above-mentioned problem.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure heavy-duty twin-screw pump, comprising a pump body, an inlet fixedly connected to the front end of the pump body, an outlet fixedly connected to the top end of the pump body, and the pump body having a hollow internal structure with both the left and right ends open.

[0006] The pump body is equipped with a rear bearing assembly at the left end and a front bearing assembly at the right end. A bushing is fixedly connected inside the pump body. The inner hole of the bushing has a variable diameter structure and the left and right ends are tapered.

[0007] The bushing has a double helical rod structure inside.

[0008] Preferably, the rear bearing assembly includes a rear bearing housing, on which six fixing bolts are fixedly connected, the fixing bolts being fixedly connected to the left end of the pump body, and a rear bearing cover at the left end of the rear bearing housing, on which six fixing screws are fixedly connected, the fixing screws being fixedly connected to the rear bearing housing.

[0009] The rear bearing cover has a fixed connection between the rear drive bearing and the rear driven bearing.

[0010] Preferably, the front bearing assembly includes a front bearing housing, on which six fixing bolts are fixedly connected, and the fixing bolts are fixedly connected to the left end of the pump body; the left end of the front bearing housing has a front bearing cover, on which six fixing screws are fixedly connected, and the fixing screws are fixedly connected to the front bearing housing.

[0011] The front bearing housing contains a fixed connection between the front drive bearing and the front driven bearing.

[0012] Preferably, the double helix structure includes a drive screw, which is disposed inside the bushing. The left end of the drive screw is rotatably connected to the rear drive bearing, and the right end of the drive screw is rotatably connected to the front drive bearing.

[0013] The drive screw is provided with drive spiral threads.

[0014] Preferably, the bushing has a driven screw inside, the driven screw is disposed inside the bushing, the left end of the driven screw is rotatably connected to the rear driven bearing, and the right end of the driven screw is rotatably connected to the front driven bearing;

[0015] The driven screw is provided with driven spiral threads.

[0016] Preferably, the driving spiral is engaged with the driven spiral.

[0017] Preferably, the drive screw is fixedly connected to a drive gear inside the rear bearing housing, and the driven screw is fixedly connected to a driven gear inside the rear bearing housing;

[0018] The drive gear meshes with the driven gear.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] (1) The high-pressure heavy-duty twin-screw pump uses fixing bolts to fasten the cast steel disc-shaped rear bearing housing and front bearing housing to the pump body, ensuring a stable connection between the bearing assembly and the pump body; fixing screws fix the rear bearing cover and front bearing cover to the corresponding bearing housing respectively, forming a closed space to protect the bearing; the rear drive bearing, rear driven bearing, front drive bearing, and front driven bearing support the two ends of the double-helix screw respectively, the cylindrical roller bearing bears the radial force, and the angular contact ball bearing bears the axial force, reducing vibration during rotation, ensuring smooth rotation of the screw, and providing stable support for media transportation.

[0021] (2) In this high-pressure heavy-duty twin-screw pump, external power is transmitted to the drive screw, which drives the drive gear to rotate. The drive gear meshes with the driven gear, transmitting power to the driven screw and ensuring that the two rotate synchronously with a transmission ratio of 1:1. The drive helix and the driven helix achieve precise meshing due to synchronous rotation, forming a continuous sealed chamber to prevent leakage of the medium at the meshing point. The gear meshing ensures that the twin screws rotate at the same speed, while the helix meshing ensures that the medium is pushed stably. The combination of the two improves the volumetric efficiency and operational stability of the pump.

[0022] (3) In this high-pressure heavy-duty twin-screw pump, the 42CrMo rod-shaped drive screw rotates under external power. Its two ends are supported by the rear drive bearing and the front drive bearing to ensure rotational stability. The drive helix meshes with the driven helix, driving the driven screw to rotate synchronously. The driven screw rotates stably with the support of the rear driven bearing and the front driven bearing. When the twin screws mesh and rotate with a gap of 0.02-0.05mm between the tooth tip circle and the middle straight section of the bushing, the helix and the inner wall of the bushing form a sealed cavity, pushing the medium from the suction end to the discharge end. The supporting effect of the bearing reduces the screw deflection and avoids friction with the bushing. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a schematic diagram of the structure of a high-pressure heavy-duty twin-screw pump according to the present invention;

[0025] Figure 2 This is a front view schematic diagram of a high-pressure heavy-duty twin-screw pump according to the present invention;

[0026] Figure 3 This is a schematic cross-sectional view of a high-pressure heavy-duty twin-screw pump according to the present invention;

[0027] Figure 4 This is a schematic diagram of the double helix rod of this utility model.

[0028] Reference numerals: 1. Pump body; 2. Inlet; 3. Outlet; 4. Rear bearing housing; 5. Rear bearing cover; 6. Front bearing housing; 7. Front bearing cover; 8. Fixing bolt; 9. Bushing; 10. Drive screw; 11. Drive helical thread; 12. Driven screw; 13. Driven helical thread; 14. Rear drive bearing; 15. Rear driven bearing; 16. Drive gear; 17. Driven gear; 18. Front drive bearing; 19. Front driven bearing; 20. Fixing screw. Detailed Implementation

[0029] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional 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] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] Please see Figure 1-4 This utility model provides a technical solution:

[0034] A high-pressure heavy-duty twin-screw pump includes a pump body 1, with an inlet 2 fixedly connected to the front end of the pump body 1 and an outlet 3 fixedly connected to the top end of the pump body 1. The pump body 1 has a hollow internal structure and is open at both ends.

[0035] A rear bearing assembly is provided at the left end of the pump body 1, and a front bearing assembly is provided at the right end of the pump body 1. A bushing 9 is fixedly connected inside the pump body 1. The inner hole of the bushing 9 has a variable diameter structure and the left and right ends are tapered.

[0036] The bushing 9 has a double helical rod structure inside;

[0037] The medium enters the cast steel cylindrical pump body 1 from the inlet 2, with a length of 300-500mm. It relies on the high-strength alloy cast iron cylindrical bushing 9 with a variable diameter inner hole to form a closed conveying space. The left and right conical sections of the bushing 9 cooperate with the conjugate cycloidal toothed double helix rod to form a continuous sealed chamber when the screw rotates. The front and rear bearing assembly combined bearing structure provides support for the double helix rod and reduces deflection during rotation. As the double helix rod rotates, the medium is entrained by the sealed chamber and pushed from the inlet 2 side to the outlet 3, and finally discharged through the outlet 3. The variable diameter structure of the bushing 9 can also reduce medium backflow and improve conveying efficiency.

[0038] Furthermore, the rear bearing assembly includes a rear bearing housing 4, on which six fixing bolts 8 are fixedly connected. The fixing bolts 8 are fixedly connected to the left end of the pump body 1. The left end of the rear bearing housing 4 has a rear bearing cover 5, on which six fixing screws 20 are fixedly connected. The fixing screws 20 are fixedly connected to the rear bearing housing 4.

[0039] The rear bearing cover 5 is internally fixedly connected to the rear drive bearing 14 and the rear driven bearing 15;

[0040] The front bearing assembly includes a front bearing housing 6, on which six fixing bolts 8 are fixedly connected. The fixing bolts 8 are fixedly connected to the left end of the pump body 1. The left end of the front bearing housing 6 has a front bearing cover 7, on which six fixing screws 20 are fixedly connected. The fixing screws 20 are fixedly connected to the front bearing housing 6.

[0041] The front bearing housing 6 has a front drive bearing 18 and a front driven bearing 19 fixedly connected inside.

[0042] The fixing bolts 8 secure the cast steel disc-shaped rear bearing housing 4 and front bearing housing 6 to the pump body 1, ensuring a stable connection between the bearing assembly and the pump body 1; the fixing screws 20 fix the rear bearing cover 5 and the front bearing cover 7 to their respective bearing housings, forming a closed space to protect the bearings; the rear drive bearing 14, the rear driven bearing 15, the front drive bearing 18, and the front driven bearing 19 support the two ends of the double-helix screw respectively, with the cylindrical roller bearing bearing the radial force and the angular contact ball bearing bearing the axial force, reducing vibration during rotation, ensuring smooth screw rotation, and providing stable support for media transportation;

[0043] Furthermore, the double helix structure includes a drive screw 10, which is disposed inside the bushing 9. The left end of the drive screw 10 is rotatably connected to the rear drive bearing 14, and the right end of the drive screw 10 is rotatably connected to the front drive bearing 18.

[0044] The drive screw 10 is provided with drive spiral threads 11;

[0045] The bushing 9 has a driven screw 12 inside. The driven screw 12 is located inside the bushing 9. The left end of the driven screw 12 is rotatably connected to the rear driven bearing 15, and the right end of the driven screw 12 is rotatably connected to the front driven bearing 19.

[0046] The driven screw 12 is provided with a driven spiral pattern 13;

[0047] The 42CrMo rod-shaped drive screw 10 rotates under external power. Its two ends are supported by the rear drive bearing 14 and the front drive bearing 18 to ensure rotational stability. The drive helix 11 meshes with the driven helix 13, driving the driven screw 12 to rotate synchronously. The driven screw 12 rotates stably with the support of the rear driven bearing 15 and the front driven bearing 19. When the twin screws mesh and rotate with a gap of 0.02-0.05mm between the tooth tip circle and the middle straight section of the bushing 9, the helix and the inner wall of the bushing 9 form a sealed cavity, pushing the medium from the suction end to the discharge end. The supporting effect of the bearings reduces the screw deflection and avoids friction with the bushing 9.

[0048] Furthermore, the driving spiral 11 and the driven spiral 13 are engaged and connected.

[0049] The drive screw 10 is fixedly connected to the drive gear 16 inside the rear bearing housing 4, and the driven screw 12 is fixedly connected to the driven gear 17 inside the rear bearing housing 4.

[0050] The drive gear 16 is meshed with the driven gear 17;

[0051] External power is transmitted to the drive screw 10, which drives the drive gear 16 to rotate. The drive gear 16 meshes with the driven gear 17, transmitting power to the driven screw 12 and ensuring that the two rotate synchronously with a transmission ratio of 1:1. The drive helical groove 11 and the driven helical groove 13 achieve precise meshing due to synchronous rotation, forming a continuous sealed chamber to prevent media leakage at the meshing point. The gear meshing ensures that the two screws rotate at the same speed, while the helical groove meshing ensures that the media is pushed stably. The combination of the two improves the pump's volumetric efficiency and operational stability.

[0052] Working principle: The fixing bolts 8 fasten the cast steel disc-shaped rear bearing housing 4 and front bearing housing 6 to the pump body 1, ensuring a stable connection between the bearing assembly and the pump body 1; the fixing screws 20 fix the rear bearing cover 5 and the front bearing cover 7 to the corresponding bearing housings, forming a closed space to protect the bearings; the rear drive bearing 14, the rear driven bearing 15, the front drive bearing 18, and the front driven bearing 19 support the two ends of the double-helix screw respectively. The cylindrical roller bearings bear the radial force, and the angular contact ball bearings bear the axial force, reducing vibration during rotation, ensuring smooth rotation of the screw, and providing stable support for media transportation.

[0053] External power is transmitted to the drive screw 10, which drives the drive gear 16 to rotate. The drive gear 16 meshes with the driven gear 17, transmitting power to the driven screw 12 and ensuring that the two rotate synchronously with a transmission ratio of 1:1. The drive helical groove 11 and the driven helical groove 13 achieve precise meshing due to synchronous rotation, forming a continuous sealed chamber to prevent media leakage at the meshing point. The gear meshing ensures that the two screws rotate at the same speed, while the helical groove meshing ensures that the media is pushed stably. The combination of the two improves the pump's volumetric efficiency and operational stability.

[0054] The 42CrMo rod-shaped drive screw 10 rotates under external power. Its two ends are supported by the rear drive bearing 14 and the front drive bearing 18 to ensure rotational stability. The drive helix 11 meshes with the driven helix 13, driving the driven screw 12 to rotate synchronously. The driven screw 12 rotates stably with the support of the rear driven bearing 15 and the front driven bearing 19. When the twin screws mesh and rotate with a gap of 0.02-0.05mm between the tooth tip circle and the middle straight section of the bushing 9, the helix and the inner wall of the bushing 9 form a sealed cavity, pushing the medium from the suction end to the discharge end. The supporting effect of the bearings reduces the screw deflection and avoids friction with the bushing 9.

[0055] Structural Description:

[0056] Pump Body 1: Pump body 1 is a cylindrical structure made of cast steel. It is hollow inside and open at both ends. The front end is fixedly connected to the inlet 2, and the top end is fixedly connected to the outlet 3. The rear bearing assembly is installed at the left end and the front bearing assembly is installed at the right end. The bushing 9 is fixedly connected inside. Its length ranges from 300-500mm. As the basic shell of the entire twin-screw pump, it supports all the internal core components. The cast steel material has high strength and pressure resistance, and is suitable for high-pressure and heavy-load conditions. The hollow structure provides installation space for the bushing 9 and the twin-screw structure. The open design at both ends facilitates the assembly of the bearing assembly. The layout of the front inlet 2 and the top outlet 3 conforms to the media conveying path, ensuring the smooth flow of the media from suction to discharge.

[0057] Inlet 2: Inlet 2 is fixedly connected to the front end of pump body 1 and communicates with the hollow structure inside pump body 1. It is the channel for the medium to enter the pump body. The front end is set to facilitate the medium to quickly enter the pump body and precisely connect with the sealed chamber formed by the double helix rod, providing the starting inlet for continuous medium delivery and ensuring the rationality of the medium delivery path.

[0058] Outlet 3: Outlet 3 is fixedly connected to the top of pump body 1 and communicates with the internal hollow structure of pump body 1. It is the channel for the medium to be discharged after being transported. The top is set in accordance with the flow direction of the medium under the push of the double helix rod (pushing from the inlet side to the outlet side), which facilitates the smooth discharge of the medium under pressure, reduces the transport resistance, and improves the discharge efficiency.

[0059] Rear bearing housing 4 (rear bearing assembly): The rear bearing housing 4 is a cast steel disc-shaped structure, which is fixedly connected to the left end of the pump body 1 by 6 fixing bolts 8. The interior provides installation space for the rear drive bearing 14 and the rear driven bearing 15. The left end is connected to the rear bearing cover 5. The cast steel material ensures the structural strength and can withstand the radial and axial forces transmitted by the bearing. The disc-shaped design increases the contact area with the pump body 1 and achieves a stable connection with the fixing bolts 8. It provides a closed installation space for the rear bearing assembly to ensure stable operation of the bearing.

[0060] Rear bearing cover 5 (rear bearing assembly): The rear bearing cover 5 is fixedly connected to the left end of the rear bearing housing 4 by 6 fixing screws 20, forming a closed space that covers the rear drive bearing 14 and the rear driven bearing 15. The closed structure can prevent dust and impurities from entering the bearing and protect the bearing from external contamination. The fixing screws 20 achieve a tight connection with the rear bearing housing 4, ensuring the sealing of the bearing working environment and extending the service life of the bearing.

[0061] Front bearing housing 6 (front bearing assembly): The front bearing housing 6 is a cast steel disc-shaped structure, which is fixedly connected to the right end of the pump body 1 by 6 fixing bolts 8. The interior provides installation space for the front drive bearing 18 and the front driven bearing 19. The left end is connected to the front bearing cover 7, which is symmetrically distributed with the rear bearing housing 4, and together they provide end support for the double helical rod structure. The cast steel material and the connection method of the fixing bolts 8 ensure its structural stability under high pressure and heavy load, and avoid displacement caused by vibration.

[0062] Front bearing cover 7 (front bearing assembly): The front bearing cover 7 is fixedly connected to the left end of the front bearing housing 6 by 6 fixing screws 20, forming a closed space that covers the front drive bearing 18 and the front driven bearing 19. It has the same function as the rear bearing cover 5. The closed structure protects the front bearing assembly and prevents media leakage and external impurities from entering. Together with the front bearing housing 6, it provides a stable working environment for the bearing.

[0063] Fixing bolts 8: There are 12 fixing bolts in total (6 for the rear bearing housing 4 and 6 for the front bearing housing 6). The rear bearing housing 4 is fixed to the left end of the pump body 1 and the front bearing housing 6 is fixed to the right end of the pump body 1. The bolt connection method can provide strong preload to ensure that the connection between the bearing housing and the pump body 1 is stable and to prevent loosening under high pressure and heavy load conditions. The 6 evenly distributed bolts make the force uniform and reduce stress concentration at the connection.

[0064] Bushing 9: Bushing 9 is a cylindrical structure made of high-strength alloy cast iron, fixedly connected inside the pump body 1. The inner hole has a variable diameter design and tapered ends. It works with the double helix structure (driving screw 10, driven screw 12) to form a closed conveying space. The high-strength alloy cast iron has strong wear resistance and is suitable for conveying heavy-duty media. The variable diameter inner hole and the conjugate cycloidal teeth of the double helix form a continuous sealed chamber when the screw rotates, reducing media backflow. The tapered sections at both ends enhance the sealing with the screw and improve the conveying efficiency.

[0065] Drive screw 10 (double helical structure): The drive screw 10 is a rod-shaped structure made of 42CrMo material, set inside the bushing 9. The left end is rotatably connected to the rear drive bearing 14, and the right end is rotatably connected to the front drive bearing 18. The surface is provided with drive helical threads 11. The drive gear 16 is fixedly connected inside the rear bearing seat 4 at the left end. The 42CrMo material has high strength and good toughness and can withstand the torque under high pressure and heavy load. Both ends are supported by bearings to reduce deflection during rotation and avoid friction with the bushing 9. The drive helical threads 11 mesh with the driven helical threads 13 to form a sealed chamber to push the medium, and cooperate with the drive gear 16 to achieve synchronous rotation.

[0066] Drive helix 11: Drive helix 11 is a conjugate cycloidal tooth shape, which is set on the surface of drive screw 10 and meshes with driven helix 13 of driven screw 12. The conjugate cycloidal tooth shape ensures precise meshing with driven helix 13, forming a continuous sealed chamber during rotation, entraining the medium and pushing it from inlet 2 to outlet 3; the tooth shape design reduces leakage of the medium at the meshing point and improves the volumetric efficiency of the pump.

[0067] Driven screw 12 (double helical structure): The driven screw 12 is a rod-shaped structure made of 42CrMo material, located inside the bushing 9, and distributed parallel to the drive screw 10. The left end is rotatably connected to the rear driven bearing 15, and the right end is rotatably connected to the front driven bearing 19. The surface is provided with driven helical threads 13. The driven gear 17 is fixedly connected inside the rear bearing seat 4 at the left end. The gear is made of the same material as the drive screw 10 to ensure the overall structural strength. Both ends are supported by bearings to ensure rotational stability. The driven helical threads 13 mesh with the drive helical threads 11, and together with the driven gear 17, they achieve synchronous rotation, forming a sealed chamber to transport the medium.

[0068] Driven spiral 13: The driven spiral 13 is a conjugate cycloidal tooth shape, which is set on the surface of the driven screw 12 and meshes with the driving spiral 11 of the driving screw 10. The conjugate design with the driving spiral 11 ensures precise meshing and forms a continuous closed chamber when the twin screws rotate, which stably pushes the medium from the inlet side to the outlet, enhancing the continuity and sealing of the medium transportation.

[0069] Rear drive bearing 14 (rear bearing assembly): The rear drive bearing 14 is fixedly connected inside the rear bearing cover 5, providing rotational support for the left end of the drive screw 10. It is a combined bearing structure (cylindrical roller bearing bears radial force, and angular contact ball bearing bears axial force). The combined bearing bears both radial and axial forces, which is suitable for complex forces under high pressure and heavy load. It provides stable support for the left end of the drive screw 10, reduces vibration and deflection during rotation, and ensures smooth rotation of the screw.

[0070] Rear driven bearing 15 (rear bearing assembly): The rear driven bearing 15 is fixedly connected inside the rear bearing cover 5 to provide rotational support for the left end of the driven screw 12. It is also a combined bearing structure (cylindrical roller bearing + angular contact ball bearing), symmetrically distributed with the rear drive bearing 14, together providing support for the left end of the twin screws, balancing the force on the screws during rotation, reducing deflection, avoiding friction between the screw and the bushing 9, and extending service life.

[0071] Drive gear 16: Drive gear 16 is fixedly connected to the left end of drive screw 10 (inside the rear bearing housing 4) and meshes with driven gear 17. The transmission ratio is 1:1. By meshing with driven gear 17, external power is transmitted to driven screw 12, ensuring that drive screw 10 and driven screw 12 rotate synchronously. The 1:1 transmission ratio ensures that the two screws rotate at the same speed, making the spiral threads mesh precisely and improving the stability of the sealed chamber.

[0072] Driven gear 17: Driven gear 17 is fixedly connected to the left end of driven screw 12 (inside the rear bearing housing 4) and meshes with drive gear 16. The transmission ratio is 1:1. It works with drive gear 16 to achieve synchronous rotation of the two screws, ensuring the meshing accuracy of drive helix 11 and driven helix 13, avoiding medium leakage caused by speed difference, and improving the volumetric efficiency and operational stability of the pump.

[0073] Front drive bearing 18 (front bearing assembly): The front drive bearing 18 is fixedly connected inside the front bearing housing 6 and rotatably connected to the right end of the drive screw 10. It is a combined bearing structure (cylindrical roller bearing bears radial force and angular contact ball bearing bears axial force). Together with the rear drive bearing 14, it supports both ends of the drive screw 10, balances the radial and axial forces when the screw rotates, reduces vibration, and ensures that the drive screw 10 rotates smoothly under high pressure.

[0074] Front driven bearing 19 (front bearing assembly): The front driven bearing 19 is fixedly connected inside the front bearing housing 6 and rotatably connected to the right end of the driven screw 12. It is a combined bearing structure (cylindrical roller bearing + angular contact ball bearing). It symmetrically supports both ends of the driven screw 12 with the rear driven bearing 15, balances the force, reduces rotational deflection, ensures precise meshing between the driven screw 12 and the drive screw 10, and improves the overall operational stability.

[0075] Fixing screws 20: There are 12 fixing screws in total (6 for the rear bearing cover 5 and 6 for the front bearing cover 7). The rear bearing cover 5 is fixed to the rear bearing housing 4 and the front bearing cover 7 is fixed to the front bearing housing 6. The evenly distributed screws achieve a tight connection between the bearing cover and the bearing housing, forming a closed space to protect the internal bearing, prevent dust and media from entering, and ensure the stability of the bearing position during rotation, avoiding vibration caused by loosening.

[0076] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A high-pressure, heavy-duty twin-screw pump, comprising a pump body (1), characterized in that: The pump body (1) is fixedly connected to the front end of the water inlet (2) and the pump body (1) is fixedly connected to the top end of the water outlet (3). The pump body (1) has a hollow structure inside and the left and right ends are open. The pump body (1) is provided with a rear bearing assembly at the left end and a front bearing assembly at the right end. The pump body (1) is fixedly connected with a bushing (9). The inner hole of the bushing (9) is a variable diameter structure and the left and right ends are tapered. The bushing (9) has a double helical rod structure inside.

2. The high-pressure heavy-duty twin-screw pump according to claim 1, characterized in that: The rear bearing assembly includes a rear bearing housing (4), on which six fixing bolts (8) are fixedly connected. The fixing bolts (8) are fixedly connected to the left end of the pump body (1). The left end of the rear bearing housing (4) has a rear bearing cover (5), on which six fixing screws (20) are fixedly connected. The fixing screws (20) are fixedly connected to the rear bearing housing (4). The rear bearing cover (5) is internally fixedly connected to the rear drive bearing (14) and the rear driven bearing (15).

3. A high-pressure heavy-duty twin-screw pump according to claim 2, characterized in that: The front bearing assembly includes a front bearing housing (6), on which six fixing bolts (8) are fixedly connected, and the fixing bolts (8) are fixedly connected to the left end of the pump body (1); the left end of the front bearing housing (6) has a front bearing cover (7), on which six fixing screws (20) are fixedly connected, and the fixing screws (20) are fixedly connected to the front bearing housing (6); The front bearing housing (6) has a front drive bearing (18) and a front driven bearing (19) fixedly connected inside.

4. A high-pressure heavy-duty twin-screw pump according to claim 3, characterized in that: The double helical rod structure includes a drive screw (10), which is disposed inside the bushing (9). The left end of the drive screw (10) is rotatably connected to the rear drive bearing (14), and the right end of the drive screw (10) is rotatably connected to the front drive bearing (18). The drive screw (10) is provided with drive spiral threads (11).

5. A high-pressure heavy-duty twin-screw pump according to claim 4, characterized in that: The bushing (9) has a driven screw (12) inside. The driven screw (12) is located inside the bushing (9). The left end of the driven screw (12) is rotatably connected to the rear driven bearing (15), and the right end of the driven screw (12) is rotatably connected to the front driven bearing (19). The driven screw (12) is provided with driven spiral threads (13).

6. A high-pressure heavy-duty twin-screw pump according to claim 4, characterized in that: The driving spiral (11) is engaged with the driven spiral (13).

7. A high-pressure heavy-duty twin-screw pump according to claim 5, characterized in that: The drive screw (10) is fixedly connected to the drive gear (16) inside the rear bearing housing (4), and the driven screw (12) is fixedly connected to the driven gear (17) inside the rear bearing housing (4); The drive gear (16) meshes with the driven gear (17).

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