Sanitary double-screw pump with detachable pump cavity

Abstract

The utility model relates to the technical field of screw pumps, in particular to a sanitary double-screw pump with a detachable pump cavity, which comprises a pump body connector, a driving shaft and a driven shaft, the driving shaft and the driven shaft are arranged in the pump body connector, a gear box is arranged at one end of the pump body connector, gear oil is filled in the gear box, and the driven shaft is connected with the gear box. A driving gear and a driven gear which are used for transmission supporting are arranged in the pump body connector, the driving shaft is connected with the driving gear through a key, and the driven shaft is connected with the driven gear through a key, a gear sleeve or an expansion device. According to the sanitary double-screw pump with the detachable pump cavity, the spiral sleeves do not make contact with one another and are not abraded, any impurities cannot fall off to pollute a conveying medium even if the pump runs for a long time, and therefore in the food industry, the double-screw pump is cleaner, more sanitary and more advantageous, sealing and stability of connection between a pump body connector and a pump body connecting screw are guaranteed through a pump body sealing ring, and the service life of the pump body is prolonged. Static sealing is realized, and easy disassembly can be realized.

Description

Sanitary twin-screw pump with detachable pump chamber Technical Field

[0001] This utility model relates to the field of screw pump technology, specifically a sanitary-grade twin-screw pump with a detachable pump chamber. Background Technology

[0002] A screw pump, also known as a helical pump, is a type of pump that uses the rotation of helical blades to make water rise in a spiral shape along the axis.

[0003] Traditional screw pumps are driven by a single screw, which is used for transportation. However, the transportation speed of a single screw is limited, which affects the actual transportation speed. In addition, the existing devices are also relatively tightly connected with screw components, which makes them prone to wear and tear during long-term operation. This can lead to worn parts falling off and causing pollution.

[0004] Therefore, a sanitary-grade twin-screw pump with a detachable pump chamber is proposed to solve the problems mentioned above. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a sanitary-grade twin-screw pump with a detachable pump chamber, which can achieve various quick-connect inlet and outlet interface forms. The screw sleeves do not contact each other, there is no wear, and no impurities will fall and contaminate the conveyed medium during long-term operation, making it cleaner and more hygienic.

[0006] To achieve the above objectives, the present invention provides the following technical solution: including a pump body interface, and a drive shaft and a driven shaft disposed inside the pump body interface, a gearbox is disposed at one end of the pump body interface, the gearbox is filled with gear oil, and a drive gear and a driven gear for transmission support are disposed inside the pump body interface.

[0007] The drive shaft and the drive gear are connected by a key, and the driven shaft and the driven gear are connected by a key, a gear sleeve, or a tensioner.

[0008] Preferably, a pump body is provided on one side of the pump body interface, the pump body interface is fixed to the pump body by a pump body connecting screw, and a pump body sealing ring for sealing is provided between the pump body interface and the pump body.

[0009] Preferably, a drain plug is threaded onto the outer side of the pump body interface, and the drain plug extends into the interior of the pump body interface.

[0010] Preferably, a centering flange and a bearing housing are provided on one side of the pump body, a long screw for connecting and supporting is provided through the pump body, the centering flange and the bearing housing, and a long pin for positioning and supporting is provided through the pump body, the centering flange and the bearing housing, and a centering flange sealing ring is provided between the centering flange and the long screw.

[0011] Preferably, the drive shaft is rotatably mounted on one side of the bearing housing, and the driven shaft is rotatably mounted on one side of the bearing housing. The two ends of the drive shaft and the driven shaft can be supported by cylindrical roller bearings, angular contact ball bearings, and double row angular contact ball bearings.

[0012] Preferably, the drive shaft and the driven shaft are secured with a cartridge mechanical seal on their outer sides by a mechanical seal set screw, and a buffer interface for providing lubrication protection is provided on one side of the cartridge mechanical seal.

[0013] Preferably, a left spiral sleeve and a right spiral sleeve are fixed to the outside of the drive shaft and the driven shaft by a spiral sleeve clamping screw, a clamping screw sealing ring is provided between the driven shaft and the right spiral sleeve, and a spiral sleeve sealing ring is provided between the drive shaft and the left spiral sleeve.

[0014] Compared with the prior art, this utility model provides a sanitary-grade twin-screw pump with a detachable pump chamber, which has the following beneficial effects:

[0015] 1. All flow parts of the twin-screw pump are made of metal and feature a dead-angle-free design. It can use a variety of materials such as stainless steel, titanium alloy, Hastelloy, copper, carbon steel, and cast iron in combination. The screw sleeves do not contact each other, resulting in no wear. Even after long-term operation, no impurities will fall and contaminate the conveyed medium. Therefore, twin-screw pumps are cleaner, more hygienic, and have a greater advantage in the food industry.

[0016] 2. The pump body interface and the pump body are connected by pump body connecting screws, and the pump body sealing ring is used in the middle to ensure the sealing and stability of the connection between the pump body interface and the pump body connecting screws, achieving static sealing. The flow-through components include the pump body and the spiral sleeve, which can be easily disassembled. They can be cleaned online or thoroughly cleaned after disassembly. The entire pump is made of stainless steel and can be steam purged.

[0017] 3. The cartridge mechanical seal has a pump body connecting screw assembly with a dynamic ring and a stationary ring assembly inside. It is locked by the mechanical seal set screw and the shaft to achieve axial positioning and anti-rotation function.

[0018] 4. The mechanical seal surface is lubricated and protected through the buffer interface, and the mechanical seal contact surface is kept under the set working conditions. The pump adopts a double-end mechanical seal, and the pressure in the sealing chamber is connected to the pressure in the pump body. At the same time, the structural design allows for sufficient cooling circulation of the seal to ensure the sealing effect and prevent leakage. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the AA cross-sectional structure of this utility model;

[0020] Figure 2 is a schematic diagram of the BB cross-sectional structure of this utility model;

[0021] Figure 3 is a schematic side view of the overall structure of this utility model;

[0022] Figure 4 is a top view of the overall structure of this utility model.

[0023] In the diagram: 1. Pump body interface; 2. Pump body connecting screw; 3. Pump body sealing ring; 4. Pump body; 5. Alignment flange; 6. Alignment flange sealing ring; 7. Long screw; 8. Gearbox; 9. Drain plug; 10. Cartridge mechanical seal; 10.1. Buffer interface; 10.2. Mechanical seal set screw; 11. Screw sleeve clamping screw; 12. Left screw sleeve; 13. Drive shaft; 14. Screw sleeve sealing ring; 15. Long pin; 16. Cylindrical roller bearing; 17. Angular contact ball bearing; 18. Double row angular contact ball bearing; 19. Drive gear; 20. Driven gear; 21. Bearing housing; 22. Driven shaft; 23. Right screw sleeve; 24. Clamping screw sealing ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Embodiments

[0025] Please refer to Figures 1-4. The sanitary-grade detachable twin-screw pump in this embodiment includes a pump body interface 1, and a drive shaft 13 and a driven shaft 22 disposed inside the pump body interface 1. A gearbox 8 is provided at one end of the pump body interface 1. The gearbox 8 is filled with gear oil. A drive gear 19 and a driven gear 20 for transmission support are provided inside the pump body interface 1.

[0026] The drive shaft 13 is connected to the drive gear 19 by a key, and the driven shaft 22 and the driven gear 20 are connected by a key, a gear sleeve or a tensioner.

[0027] The bottom of the gearbox 8 contains gear oil, which provides lubrication and protection for the meshing of the drive gear 19 and the driven gear 20. The high-precision synchronous gears ensure that the spiral sleeve works within the set gap, enabling stable and shear-free material conveying. Furthermore, the gear oil used for lubricating the synchronous gears can be food-grade, ensuring a strict operating environment.

[0028] By making all the flow-through components of the device metal and adopting a dead-angle-free design, a variety of materials such as stainless steel, titanium alloy, Hastelloy, copper, carbon steel, and cast iron can be used in combination. The spiral sleeves do not contact each other, there is no wear, and no impurities will fall and contaminate the conveyed medium during long-term operation. Therefore, in the food industry, twin-screw pumps are cleaner, more hygienic, and have more advantages.

[0029] A pump body 4 is provided on one side of the pump body interface 1. The pump body interface 1 is fixed to the pump body 4 by the pump body connecting screw 2. A pump body sealing ring 3 for sealing is provided between the pump body interface 1 and the pump body 4.

[0030] A drain plug 9 is threaded on the outside of the pump body interface 1, and the drain plug 9 extends into the inside of the pump body interface 1.

[0031] A centering flange 5 and a bearing housing 21 are provided on one side of the pump body 4. A long screw 7 for connecting support is provided through the pump body 4, the centering flange 5 and the bearing housing 21. A long pin 15 for positioning support is provided through the pump body 4, the centering flange 5 and the bearing housing 21. A centering flange sealing ring 6 is provided between the centering flange 5 and the long screw 7.

[0032] The drive shaft 13 is rotatably mounted on one side of the bearing housing 21, and the driven shaft 22 is rotatably mounted on one side of the bearing housing 21. Both ends of the drive shaft 13 and the driven shaft 22 can be supported by cylindrical roller bearings 16, angular contact ball bearings 17 and double row angular contact ball bearings 18.

[0033] A cartridge mechanical seal 10 is locked to the outside of the drive shaft 13 and the driven shaft 22 by a mechanical seal set screw 10.2. A buffer interface 10.1 for providing lubrication protection is provided on one side of the cartridge mechanical seal 10.

[0034] A left spiral sleeve 12 and a right spiral sleeve 23 are fixed to the outside of the drive shaft 13 and the driven shaft 22 by a spiral sleeve clamping screw 11. A clamping screw sealing ring 24 is provided between the driven shaft 22 and the right spiral sleeve 23, and a spiral sleeve sealing ring 14 is provided between the drive shaft 13 and the left spiral sleeve 12.

[0035] Pump body interface 1 and pump body 4 are connected by pump body connecting screw 2, and pump body sealing ring 3 is used in the middle to ensure the sealing and stability of the connection between pump body interface 1 and pump body connecting screw 2, achieving static sealing. The flow-through components include pump body and spiral sleeve, which can be easily disassembled. They can be cleaned online or thoroughly cleaned after disassembly. The entire pump is made of stainless steel and can be steam purged.

[0036] After the drain plug 9 is removed, the pump chamber can be emptied or purged to facilitate internal cleaning;

[0037] The pump body 4, the centering flange 5, and the bearing housing 21 are connected by long screws 7 and positioned by long pins 15. Static sealing is achieved in the middle by the centering flange sealing ring 6, which ensures the stability of the connection and the reliable sealing between the pump body 4, the centering flange 5, and the bearing housing 21.

[0038] The drive shaft 13 and the drive gear 19 are connected by a key, and the driven shaft 22 and the driven gear 20 are connected by a key, a gear sleeve or a tensioner to ensure stable transmission.

[0039] The bearing housing 21 provides sufficient support for the drive shaft 13 and the driven shaft 22. The support bearing adopts a long span ratio design, which has strong load-bearing capacity and good stability.

[0040] Normally, the driving gear 19 and the driven shaft 22 are supported at both ends by cylindrical roller bearings 16 and ball bearings 17 and double row angular contact ball bearings 18. The type and number of bearings can be adjusted according to the conveying conditions.

[0041] The cartridge mechanical seal 10 contains two sets of dynamic and static ring assemblies connected to the pump body by screws. These are locked to the shaft via the set screw 10.2, achieving axial positioning and anti-rotation functions. The buffer interface 10.1 provides lubrication and protection to the mechanical seal surface, ensuring the contact surface remains under set operating conditions. The pump employs a double-end mechanical seal, with the sealing chamber pressure communicating with the pump body pressure. The structural design also ensures adequate cooling circulation for the seal, guaranteeing a tight seal and preventing leakage.

[0042] The screw clamping screw 11 fixes the left screw sleeve 12 and the right screw sleeve 23 to the drive shaft 13 and the driven shaft 22. The screw clamping screw sealing ring 24 and the screw sleeve sealing ring 14 prevent the conveyed medium from entering the shaft mating area and facilitate disassembly.

[0043] Finally, a variable frequency motor or variable frequency geared motor is used for drive. Taking advantage of the specific properties of the twin screw pump as a positive displacement pump, the material flow rate or pressure can be set and adjusted, which is highly flexible and easy to operate.

[0044] Working principle:

[0045] This device is designed and manufactured according to EEDG and QHD standards, referencing the structure of a general-purpose single-suction twin-screw pump. It is suitable for CIP and SIP and complies with the US 3-A hygiene standard. It has various inlet and outlet quick-connect interface types and is widely used in the food industry, pharmaceutical industry, cosmetics industry and chemical / biotechnology industry.

[0046] Furthermore, all the flow-through components of this device are made of metal, and it adopts a dead-angle-free design. It can use a variety of materials such as stainless steel, titanium alloy, Hastelloy, copper, carbon steel, and cast iron in combination. The spiral sleeves do not contact each other, there is no wear, and no impurities will fall and contaminate the conveyed medium during long-term operation. Therefore, in the food industry, twin screw pumps are cleaner, more hygienic, and have more advantages.

[0047] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. As long as they can achieve their beneficial effects, they can be implemented. Therefore, this embodiment will not elaborate on their specific structural composition and working principle.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sanitary-grade, detachable twin-screw pump, comprising a pump body interface (1), and a drive shaft (13) and a driven shaft (22) disposed inside the pump body interface (1), characterized in that: A gearbox (8) is provided at one end of the pump body interface (1). The gearbox (8) is filled with gear oil. The pump body interface (1) is provided with a drive gear (19) and a driven gear (20) for transmission support. The drive shaft (13) and the drive gear (19) are connected by a key. The driven shaft (22) and the driven gear (20) are connected by a key, a gear sleeve, or a tensioner. A left spiral sleeve (12) and a right spiral sleeve (23) are fixed on the outside of the drive shaft (13) and the driven shaft (22) by a spiral sleeve clamping screw (11). A clamping screw sealing ring (24) is provided between the driven shaft (22) and the right spiral sleeve (23). A spiral sleeve sealing ring (14) is provided between the drive shaft (13) and the left spiral sleeve (12).

2. The sanitary-grade detachable twin-screw pump according to claim 1, characterized in that: A pump body (4) is provided on one side of the pump body interface (1). The pump body interface (1) is fixed to the pump body (4) by a pump body connecting screw (2). A pump body sealing ring (3) for sealing is provided between the pump body interface (1) and the pump body (4).

3. The sanitary-grade detachable twin-screw pump according to claim 1, characterized in that: The pump body interface (1) is threaded with a drain plug (9) on the outside, and the drain plug (9) extends into the pump body interface (1).

4. The sanitary-grade detachable twin-screw pump according to claim 2, characterized in that: A centering flange (5) and a bearing housing (21) are provided on one side of the pump body (4). A long screw (7) for connecting support is provided through the pump body (4), the centering flange (5), and the bearing housing (21). A long pin (15) for positioning support is provided through the pump body (4), the centering flange (5), and the bearing housing (21). A centering flange sealing ring (6) is provided between the centering flange (5) and the long screw (7).

5. The sanitary-grade detachable twin-screw pump according to claim 4, characterized in that: The drive shaft (13) is rotatably mounted on one side of the bearing housing (21), and the driven shaft (22) is rotatably mounted on one side of the bearing housing (21). The two ends of the drive shaft (13) and the driven shaft (22) can be supported by cylindrical roller bearings (16), angular contact ball bearings (17) and double row angular contact ball bearings (18).

6. The sanitary-grade detachable twin-screw pump according to claim 1, characterized in that: The drive shaft (13) and the driven shaft (22) are locked with a cartridge mechanical seal (10) by a mechanical seal set screw (10.2). A buffer interface (10.1) for providing lubrication protection is provided on one side of the cartridge mechanical seal (10).

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