Corrosion-resistant double-suction chemical pump

Abstract

The invention discloses a corrosion-resistant double-suction type chemical pump. The corrosion-resistant double-suction type chemical pump comprises a pump body, an impeller assembly, a sealing device and a driving mechanism. The sealing device adopts a fluororubber elastic compensation piece and is provided with a cooling system, a shock pad and a drainage groove are arranged at the bottom of the supporting frame, and a convenient access hole is formed in the top of the supporting frame. By optimizing the material and structural design, the corrosion resistance and maintenance convenience are remarkably improved, the problems that under the strong corrosion working condition, aging is likely to happen, and sealing fails are effectively solved, and the high practicability and popularization value are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical pumps, in particular to a corrosion-resistant double-suction chemical pump. Background Art

[0002] Chemical pumps are widely used in the chemical, petroleum, and pharmaceutical industries, primarily for conveying corrosive, high-temperature, or high-viscosity media. Double-suction chemical pumps are highly favored in industrial production due to their structural features, enabling stable operation under high flow and head conditions. To adapt to complex operating environments, corrosion resistance has become a key quality indicator for chemical pumps. Currently, existing double-suction chemical pumps often utilize special materials or surface treatments to enhance corrosion resistance, such as stainless steel, fluoroplastics, or anti-corrosion coatings. However, in practice, the corrosion resistance of some chemical pumps remains limited. This is particularly true when conveying strong acids, bases, or other highly corrosive media, where material degradation and seal failure are common. Furthermore, existing double-suction chemical pumps often lack consideration for maintenance in their structural design, complicating repair and component replacement, impacting equipment efficiency. Therefore, there is an urgent need for a double-suction chemical pump that balances corrosion resistance with optimized structure to meet the demands of industrial production. Summary of the Invention

[0003] The purpose of the invention is to provide a corrosion-resistant double-suction chemical pump that solves the problems mentioned in the background technology.

[0004] The present invention is implemented as follows: a corrosion-resistant double-suction chemical pump includes a pump body, an impeller assembly, a sealing device and a driving mechanism. A flow channel cavity is provided inside the pump body, and a liquid inlet and a liquid outlet are respectively provided at both ends of the flow channel cavity. The impeller assembly is installed in the middle of the flow channel cavity, and suction channels are symmetrically provided on both sides of the impeller assembly to realize a double-suction working mode. The outside of the pump body is fixedly connected to a support frame, and a shock-absorbing pad is provided at the bottom of the support frame to reduce the vibration generated during operation. The sealing device is located between the pump body and the driving mechanism. The sealing device is connected to the pump body through a flange and is fastened by bolts to ensure the sealing of the connection. The driving mechanism includes a motor and a transmission shaft. One end of the transmission shaft is key-connected to the output end of the motor, and the other end passes through the sealing device and is fixedly connected to the impeller assembly.

[0005] The sealing device includes a first sealing ring and a second sealing ring. The first sealing ring is in contact with the inner wall of the pump body, and the second sealing ring is in contact with the outer wall of the drive shaft. An elastic compensating member made of fluororubber is interposed between the first and second sealing rings. The elastic compensating member contacts the first and second sealing rings at both ends, automatically compensating for gaps in the seals due to wear or thermal expansion. A cooling groove is provided on the outside of the first sealing ring, and a cooling pipe is embedded in the cooling groove. The two ends of the cooling pipe are connected to the external cooling system to reduce the operating temperature of the sealing device and extend its service life.

[0006] The impeller assembly includes a primary impeller and secondary impeller, fixedly connected by a central shaft. The two ends of the central shaft are rotatably connected to the drive shaft and the inner wall of the pump body, respectively. The blades of the primary and secondary impellers are coated with a ceramic coating with a thickness of 0.2mm to 0.5mm to enhance the corrosion resistance of the impellers. A guide plate is positioned between the primary and secondary impellers. The guide plate's surface is provided with multiple diversion holes arranged in a honeycomb pattern to optimize the fluid flow path and reduce energy loss.

[0007] The inner wall of the pump body is lined with an anti-corrosion lining made of polytetrafluoroethylene, with a thickness of 1mm to 2mm. It is fixed to the inner wall of the pump body using a high-temperature bonding process. The surface of the anti-corrosion lining is polished to a roughness of less than Ra0.8 to reduce erosion and corrosion of the pump body by the fluid. The outer wall of the pump body is equipped with reinforcing ribs, evenly distributed along the axial direction of the pump body, to enhance the overall strength of the pump body and prevent deformation caused by pressure fluctuations.

[0008] The support frame consists of a base and side panels. The base is welded to the bottom of the pump body, while the side panels are perpendicular to the base and bolted to it. Mounting holes are located at the top of the side panels for connecting to external pipes or equipment. A drainage trough is located at the bottom of the base, with its ends connected to the pump body's liquid inlet and outlet, respectively. This drains away residual liquid during shutdown, preventing damage to the pump body caused by prolonged retention of corrosive media.

[0009] The drive mechanism also includes a protective cover bolted to the support frame. A cooling fan is located inside the cover and coaxially connected to the motor's output shaft to reduce the motor's operating temperature. Ventilation holes are arranged on the outside of the cover in a louvered pattern to enhance heat dissipation and prevent dust from entering the cover.

[0010] For easy maintenance, the pump body features an access hatch at the top. A silicone sealant is installed around the edge of the hatch to prevent foreign matter from entering the pump body during maintenance. The hatch is hinged to the pump body and secured with a quick-release latch, making maintenance more convenient. A locating pin is located on the central axis of the impeller assembly. This pin engages the inner wall of the pump body, allowing for quick positioning during installation or replacement, reducing operation time.

[0011] This invention utilizes corrosion-resistant materials such as fluororubber elastic compensators and ceramic coatings, combined with an optimized fluid diversion structure and cooling system, to effectively address the aging and seal failure issues of existing double-suction chemical pumps under highly corrosive conditions. Furthermore, its modular design and convenient maintenance structure significantly improve equipment maintenance efficiency and reduce operating costs, demonstrating its high practicality and potential for widespread adoption. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 is a side view of the present invention;

[0014] Figure 3 is a cross-sectional view of the present invention;

[0015] Figure 4 This is a schematic diagram of the structure of the inspection port on the top of the pump body.

[0016] The accompanying drawings are marked as follows: 1. Pump body; 2. Impeller assembly; 3. Sealing device; 4. Driving mechanism; 5. Support frame; 6. Liquid inlet; 7. Liquid outlet; 8. First sealing ring; 9. Second sealing ring; 10. Elastic compensation part; 11. Cooling groove; 12. Cooling pipe; 13. Inspection port; 14. Quick release lock; 15. Silicone sealing ring. DETAILED DESCRIPTION

[0017] The present invention relates to a corrosion-resistant double-suction chemical pump, the structure and operation principle of which are Figures 1 to 4A detailed description is given. The pump body 1 is the core component of the entire equipment. A flow channel cavity is provided inside the pump body 1. A liquid inlet 6 and a liquid outlet 7 are respectively provided at both ends of the flow channel cavity for the input and output of the liquid. An anti-corrosion lining is provided on the inner wall of the pump body 1. The anti-corrosion lining is made of polytetrafluoroethylene with a thickness of 1mm to 2mm and is fixed to the inner wall of the pump body by a high-temperature bonding process. The surface of the anti-corrosion lining is polished and the roughness is less than Ra0.8 to reduce the erosion and corrosion of the inner wall of the pump body by the fluid. Reinforcement ribs are evenly distributed along the axial direction on the outer wall of the pump body 1 to enhance the overall strength of the pump body and prevent deformation due to pressure fluctuations. An inspection port 13 is provided on the top of the pump body 1. The inspection port 13 is connected to the pump body 1 through a hinge, and a silicone sealing ring 15 is installed on the edge to prevent external impurities from entering the interior of the pump body. The inspection port 13 can be quickly opened and closed by a quick-release lock 14 to facilitate maintenance operations.

[0018] The impeller assembly 2 is installed in the middle of the flow channel cavity of the pump body 1, and the suction channels are symmetrically arranged on both sides of the impeller assembly 2 to form a double-suction working mode. The impeller assembly 2 includes a main impeller and a secondary impeller, which are fixedly connected by a central axis, and the two ends of the central axis are rotatably connected to the drive shaft and the inner wall of the pump body respectively. The surface of the main impeller and secondary impeller blades is coated with a ceramic coating with a thickness of 0.2mm to 0.5mm to improve the corrosion resistance of the impeller. A guide plate is arranged between the main impeller and the secondary impeller, and a plurality of guide holes distributed in a honeycomb pattern are provided on the surface of the guide plate to optimize the fluid flow path and reduce energy loss. A positioning pin is arranged on the central axis of the impeller assembly 2, and the positioning pin is used in conjunction with the inner wall of the pump body 1 to achieve rapid positioning when installing or replacing the impeller assembly, thereby reducing operation time.

[0019] The sealing device 3 is located between the pump body 1 and the driving mechanism 4. It is connected to the pump body 1 through a flange and fastened with bolts to ensure the sealing of the connection. The sealing device 3 includes a first sealing ring 8 and a second sealing ring 9. The first sealing ring 8 fits against the inner wall of the pump body, and the second sealing ring 9 fits against the outer wall of the transmission shaft. An elastic compensating member 10 is arranged between the first sealing ring 8 and the second sealing ring 9. The elastic compensating member 10 is made of fluororubber. Its two ends are in contact with the first sealing ring 8 and the second sealing ring 9 respectively, and is used to automatically compensate when a gap is generated in the seal due to wear or thermal expansion. A cooling groove 11 is arranged on the outside of the first sealing ring 8. A cooling pipe 12 is embedded in the cooling groove 11. Both ends of the cooling pipe 12 are connected to the external cooling system to reduce the operating temperature of the sealing device and extend its service life.

[0020] The drive mechanism 4 includes a motor and a drive shaft. One end of the drive shaft is keyed to the motor output terminal, while the other end passes through the sealing device 3 and is fixedly connected to the impeller assembly 2. The drive mechanism 4 also includes a protective cover, which is bolted to the support frame 5. A cooling fan is located within the cover and coaxially connected to the motor output shaft to reduce the motor's operating temperature. Ventilation holes are arranged in a louvered pattern on the outside of the cover to enhance heat dissipation and prevent dust from entering the cover.

[0021] The support frame 5 consists of a base and side panels. The base is welded to the bottom of the pump body 1, while the side panels are perpendicular to the base and bolted securely. Mounting holes are provided at the top of the side panels for connection to external pipes or equipment. A drainage trough is provided at the bottom of the base, with its ends connected to the liquid inlet 6 and liquid outlet 7 of the pump body 1, respectively. This drains away residual liquid during shutdown, preventing damage to the pump body caused by prolonged retention of corrosive media. Shock-absorbing pads are installed at the bottom of the support frame 5 to reduce vibration during operation.

[0022] The working process of the present invention is as follows: when the motor is started, the motor drives the impeller assembly 2 to rotate through the transmission shaft, and the suction channels symmetrically arranged on both sides of the impeller assembly 2 simultaneously suck in liquid. After the liquid is accelerated by the main impeller and the auxiliary impeller, it further optimizes the flow path through the guide holes on the guide plate and is finally discharged from the liquid outlet 7. During this process, the anti-corrosion lining effectively protects the inner wall of the pump body 1 from corrosion, the ceramic coating improves the corrosion resistance of the impeller assembly 2, the elastic compensating part 10 compensates for the gap of the seal in real time to maintain the sealing, and the cooling pipe 12 continuously takes away the heat generated by the sealing device 3 to extend its service life. When shutting down, the residual liquid is discharged through the drainage groove at the bottom of the base to prevent the corrosive medium from being retained for a long time and causing damage to the pump body. During maintenance, the inspection port 13 is opened through the quick-release lock 14, and the impeller assembly 2 is quickly positioned using the positioning pin on the center axis. After the maintenance is completed, the inspection port 13 is closed again and the silicone sealing ring 15 is ensured to fit tightly to prevent external impurities from entering the pump body.

[0023] The connection relationship and cooperation mode of each component in the above embodiment are designed according to actual assembly requirements. The cooperation relationship between all parts is clear and easy to implement, ensuring that the present invention can operate stably under highly corrosive working conditions and significantly improve maintenance efficiency.

[0024] In order to better enable relevant personnel in this technical field to fully understand and implement the present invention, the specific implementation principle of the present invention is supplemented below with reference to a specific application scenario.

[0025] When transporting highly acidic media in a chemical plant, the corrosion-resistant double-suction chemical pump of the present invention is first secured to the designated location via the mounting holes at the top of the side panels of the support frame 5. A drainage trough at the bottom of the base connects to an external pipeline, ensuring that residual liquid can be drained smoothly during shutdown, preventing damage to the pump body 1 caused by prolonged retention of corrosive media. The provision of shock-absorbing pads effectively reduces stress concentration caused by vibration during operation, avoiding resonance between the pump body 1 and external equipment, thereby improving the overall stability of the device.

[0026] When the motor is started, the drive shaft drives the impeller assembly 2 to rotate through the key connection. The suction channels symmetrically arranged on both sides of the impeller assembly 2 simultaneously inhale the strong acidic medium. After the medium is accelerated by the main impeller and the auxiliary impeller, it passes through the honeycomb guide holes on the guide plate to further optimize the flow path. Since the design of the guide holes can reduce the energy loss of the fluid, it can still maintain a high conveying efficiency under high flow conditions. The ceramic coating coated on the surface of the main impeller and auxiliary impeller blades has a thickness of 0.2mm to 0.5mm. Its dense structure can effectively resist the erosion of strong acidic media, thereby extending the service life of the impeller assembly 2. At the same time, the anti-corrosion lining of the inner wall of the pump body 1 is made of polytetrafluoroethylene. Its high-temperature bonding process ensures a firm bond between the lining and the inner wall of the pump body, and the roughness after polishing is less than Ra0.8, which further reduces the erosion and corrosion of the inner wall of the pump body by the medium.

[0027] Under the action of the sealing device 3, the first sealing ring 8 is in contact with the inner wall of the pump body 1, and the second sealing ring 9 is in contact with the outer wall of the drive shaft. The elastic compensating member 10 disposed between the two is made of fluororubber, which has excellent corrosion resistance and elasticity. When the seal wears out due to long-term operation or thermal expansion causes gaps, the elastic compensating member 10 automatically compensates for the gap, thereby maintaining the sealing performance. In addition, the cooling pipe 12 within the cooling tank 11 is connected to the external cooling system, continuously removing heat generated by friction and medium transfer from the sealing device 3, ensuring that the operating temperature of the sealing device 3 is always within a reasonable range, significantly extending its service life.

[0028] During maintenance, the operator quickly opens the inspection port 13 on the top of the pump body 1 using the quick-release lock 14. The silicone seal 15 ensures a tight seal during opening and closing, preventing foreign matter from entering the pump body. Using the locating pin on the central axis of the impeller assembly 2, the position of the impeller assembly 2 can be quickly located, simplifying the installation or replacement process and significantly reducing maintenance time. After maintenance is completed, the inspection port 13 is reclosed and secured with the quick-release lock 14, ensuring that the silicone seal 15 is tightly fitted to prevent foreign matter from entering the pump body.

[0029] A cooling fan inside the protective cover is coaxially connected to the motor output shaft, continuously reducing motor temperature during operation. Louvered ventilation holes on the outside of the protective cover not only enhance heat dissipation but also effectively prevent dust from entering the protective cover, ensuring stable motor operation. The base of the support frame 5 is welded to the pump body 1, and the side panels are bolted securely. The overall structure is stable and reliable, ensuring long-term stable operation of the equipment under complex operating conditions such as high pressure and high temperature.

[0030] The above steps demonstrate that this invention significantly enhances the durability and ease of use of the equipment in highly corrosive conditions by optimizing material selection, improving the sealing structure, and simplifying the maintenance design. The clear and easily implemented collaborative relationships between the various components ensure that this invention can operate efficiently in practical applications and meet industrial production requirements.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A corrosion-resistant double-suction chemical pump, comprising a pump body (1), an impeller assembly (2), a sealing device (3) and a drive mechanism (4), characterized in that: A flow channel cavity is provided inside the pump body (1), and a liquid inlet (6) and a liquid outlet (7) are respectively provided at both ends of the flow channel cavity. The impeller assembly (2) is installed in the middle of the flow channel cavity, and suction channels are symmetrically provided on both sides of the impeller assembly (2). The pump body (1) is fixedly connected to the support frame (5) on the outside. The sealing device (3) is located between the pump body (1) and the driving mechanism (4) and is fastened by flanges and bolts. The driving mechanism (4) includes a motor and a transmission shaft. One end of the transmission shaft is key-connected to the output end of the motor, and the other end passes through the sealing device (3) and is fixedly connected to the impeller assembly (2).

2. A corrosion-resistant double-suction chemical pump according to claim 1, characterized in that: The sealing device (3) comprises a first sealing ring (8) and a second sealing ring (9), wherein the first sealing ring (8) is in contact with the inner wall of the pump body (1), and the second sealing ring (9) is in contact with the outer wall of the transmission shaft. An elastic compensating member (10) is provided between the first sealing ring (8) and the second sealing ring (9), wherein the elastic compensating member (10) is made of fluororubber and its two ends are in contact with the first sealing ring (8) and the second sealing ring (9) respectively. A cooling groove (11) is provided on the outer side of the first sealing ring (8), and a cooling pipe (12) is embedded in the cooling groove (11). Both ends of the cooling pipe (12) are connected to an external cooling system.

3. The corrosion-resistant double-suction chemical pump according to claim 1, characterized in that: The impeller assembly (2) includes a main impeller and an auxiliary impeller, the main impeller and the auxiliary impeller are fixedly connected via a central shaft, the two ends of the central shaft are rotatably connected to the transmission shaft and the inner wall of the pump body (1), respectively, the surfaces of the main impeller and the auxiliary impeller blades are coated with a ceramic coating, the thickness of the ceramic coating is 0.2 mm to 0.5 mm, a guide plate is provided between the main impeller and the auxiliary impeller, and a plurality of guide holes distributed in a honeycomb pattern are provided on the surface of the guide plate.

4. The corrosion-resistant double-suction chemical pump according to claim 1, characterized in that: The inner wall of the pump body (1) is provided with an anti-corrosion lining, which is made of polytetrafluoroethylene and has a thickness of 1 mm to 2 mm. The anti-corrosion lining is fixedly connected to the inner wall of the pump body (1) through a high-temperature bonding process. The surface of the anti-corrosion lining is polished and has a roughness of less than Ra0.

8. The outer wall of the pump body (1) has reinforcing ribs evenly distributed along the axial direction.

5. The corrosion-resistant double-suction chemical pump according to claim 1, characterized in that: The support frame (5) comprises a base and side panels, the base being welded to the bottom of the pump body (1), the side panels being vertically arranged and fixedly connected to the base by bolts, a mounting hole being arranged on the top of the side panels, a drainage groove being provided at the bottom of the base, the two ends of the drainage groove being respectively connected to the liquid inlet (6) and the liquid outlet (7) of the pump body (1), and a shock-absorbing pad being provided at the bottom of the support frame (5).

6. The corrosion-resistant double-suction chemical pump according to claim 1, characterized in that: The driving mechanism (4) also includes a protective cover, which is connected to the support frame (5) by bolts. A cooling fan is arranged inside the protective cover, and the cooling fan is coaxially connected to the motor output shaft. Ventilation holes distributed in a shutter-like manner are arranged on the outside of the protective cover.

7. The corrosion-resistant double-suction chemical pump according to claim 1, characterized in that: An inspection port (13) is provided on the top of the pump body (1), the inspection port (13) is connected to the pump body (1) via a hinge, a silicone sealing ring (15) is provided on the edge of the inspection port (13), the inspection port (13) is fixed via a quick-release lock (14), and a positioning pin is provided on the central axis of the impeller assembly (2), and the positioning pin cooperates with the inner wall of the pump body (1).

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