A pump special for a refined phosphoric acid extraction process

Abstract

The utility model discloses a special pump of refined phosphoric acid extraction process, including pump body, the inlet end of pump body is connected with filter assembly, and this filter assembly includes casing, import pipe, export pipe, locating ring, filter core and cover, install import pipe at casing outside bottom, install export pipe and pump body's inlet end connection at inside top, and the cover is screwed at the top of casing, and the position of casing inside is close to the top and is equipped with the locating ring, and the filter core is screwed at the bottom of cover, and the filter core passes through the locating ring from top to bottom, and the filter core outer wall is closely matched with the locating ring. The utility model not only can intercept tiny particle impurity, eliminate emulsification inducement from the source, reduce demulsifier use cost, but also can ensure that the raw material clean and pollution -free enters subsequent chemical reaction or process step, avoids catalyst poisoning and side reaction and takes place, and improves product quality and production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of delivery pump technology, and in particular relates to a special pump for the refined phosphoric acid extraction process. Background Technology

[0002] Wet process phosphoric acid (WPPA) is a core method in the industrial production of phosphoric acid, and the purification of crude phosphoric acid is crucial. This process aims to remove fluoride, sulfate, metal ions (such as Fe, Al, Mg, etc.), and organic impurities to meet the stringent standards of industrial, food-grade, or electronic-grade phosphoric acid. Currently, extraction methods are widely used because they effectively utilize the selective distribution of phosphoric acid between the organic and aqueous phases to separate impurities. However, emulsification frequently occurs during this process, leading not only to organic phase loss and reduced processing capacity but also to product contamination and operational chaos. Traditional organic phase transfer pumps, due to design limitations, struggle to effectively address these problems and neglect the strong corrosiveness of fluoride ions in the phosphoric acid medium, resulting in a significantly shortened equipment lifespan. Furthermore, existing pumps are insufficient in terms of filtration accuracy, sealing performance, and material corrosion resistance, failing to meet the high requirements of the refined phosphoric acid extraction process. Therefore, developing a dedicated pump specifically designed for refined phosphoric acid extraction to solve these problems has become a critical technological bottleneck that the industry urgently needs to overcome. Utility Model Content

[0003] The purpose of this invention is to provide a special pump for the refined phosphoric acid extraction process, which can completely solve the shortcomings of the existing technology.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A special pump for refined phosphoric acid extraction process includes a pump body. The inlet end of the pump body is connected to a filter assembly, which includes a housing, an inlet pipe, an outlet pipe, a positioning ring, a filter element, and a cap. The inlet pipe is installed at the bottom of the outer side of the housing, and the outlet pipe is installed at the top of the inner side and connected to the inlet end of the pump body. The cap is threaded to the top of the housing. A positioning ring is provided inside the housing near the top. The bottom end of the cap is threaded to the filter element, which passes through the positioning ring from top to bottom, and the outer wall of the filter element is tightly fitted with the positioning ring.

[0006] Preferably, the filter element is a PTFE membrane filter element.

[0007] Preferably, the front end of the pump body is connected to the front guard plate by bolts, and the rear end is connected to the connecting plate by bolts. The rear guard plate is tightly clamped on the joint surface between the pump body and the connecting plate, and an O-ring is installed at the joint surface between the pump body and the rear guard plate.

[0008] Preferably, the impeller is rotatably mounted inside the pump body, and the connecting plate is connected to the shaft bracket by bolts. The shaft is rotatably mounted on the shaft bracket, with one end of the shaft connected to the motor and the other end extending into the pump body and threadedly connected to the impeller.

[0009] Preferably, the rotating shaft bracket includes a bracket cover and a bracket body welded and fixed together. A connecting shaft extends outward from the side wall of the bracket body, and an arc-shaped stop is provided on the connecting plate. The top surface of the connecting shaft fits tightly with the arc-shaped stop.

[0010] Preferably, the rotating shaft is rotatably mounted on the bracket cover via a drive-end bearing and a pump-end bearing. The drive-end bearing and the pump-end bearing are clearance-fitted with the bracket cover, and the inner rings of the drive-end bearing and the pump-end bearing are interference-fitted with the rotating shaft.

[0011] Preferably, bearing covers are installed at both ends of the bracket cover, and the pump body, impeller, front guard plate, and rear guard plate are made of silicon carbide.

[0012] Preferably, an organic seal box is installed between the rear guard plate and the connecting plate, and a mechanical seal is detachably connected to the organic seal box.

[0013] Preferably, the mechanical seal includes a rotating ring, a stationary ring, a sealing ring, a spring, a bushing, and a gland. The gland is fixedly connected to the mechanical seal housing by bolts. The bushing is fitted onto the rotating shaft and fixedly connected by fastening screws. The rotating ring is connected to the bushing by a drive pin. The stationary ring is embedded in the cavity of the gland by an anti-rotation pin. The spring pushes the rotating ring, so that the rotating ring and the stationary ring fit tightly together.

[0014] Preferably, sealing rings are provided between the moving ring and the bushing, between the stationary ring and the gland, between the bushing and the impeller end face, and between the bushing and the bracket cover end face.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. A high-precision filter assembly is integrated at the pump inlet flange, employing a bottom-in, top-out, side-in, side-out, and threaded quick-opening filter element structure, achieving a filtration accuracy of up to 0.5μm. This design not only intercepts minute particulate impurities, eliminating emulsification initiators at the source and reducing demulsifier usage costs, but also ensures that raw materials entering subsequent chemical reactions or process steps are clean and uncontaminated, preventing catalyst poisoning and side reactions, thereby improving product quality and production efficiency.

[0017] 2. The shaft seal assembly adopts double-end mechanical seal technology. The dynamic ring and stationary ring are tightly fitted under the action of spring force to form the main seal. Together with the stationary sealing rings at each interface, the leakage is reduced to an extremely low level, even achieving "zero visible leakage". This design effectively prevents the leakage of harmful or expensive process media (such as the organic phase and acidic gases in phosphoric acid extraction), ensures the safety of the production environment, reduces material loss, and conforms to the concept of green production.

[0018] 3. All flow parts are made of silicon carbide, which performs well in most acidic environments due to its excellent chemical stability and corrosion resistance. This significantly extends the service life of the pump, reduces the cost of frequent replacements and downtime maintenance caused by material corrosion, and improves the economy and reliability of equipment operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the filter assembly in this utility model;

[0021] Figure 3 This is a schematic diagram of the mechanical seal in this utility model.

[0022] In the diagram, 1. Pump body; 2. Impeller; 3. Front guard plate; 4. Rear guard plate; 5. Connecting plate; 6. Mechanical seal; 6-1. Dynamic ring; 6-2. Stationary ring; 6-3. Sealing ring; 6-4. Spring; 6-5. Shaft sleeve; 6-6. Gland; 7. Mechanical seal box; 8. Shaft bracket; 801. Bracket cover; 802. Bracket body; 803. Connecting shaft; 9. Shaft; 10. Drive end bearing; 11. Pump end bearing; 12. Bearing cover; 13. O-ring seal; 14. Filter assembly; 14-1. Housing; 14-2. Inlet pipe; 14-3. Outlet pipe; 14-4. Positioning ring; 14-5. Filter element; 14-6. Cover. Detailed Implementation

[0023] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0024] like Figures 1 to 3As shown, a special pump for refined phosphoric acid extraction process includes: pump body 1, impeller 2, front guard plate 3, rear guard plate 4, connecting plate 5, mechanical seal 6, mechanical seal housing 7, shaft bracket 8, shaft 9, drive end bearing 10, pump end bearing 11, O-ring 13, and filter assembly 14. Through precise design and coordinated operation, these components achieve efficient and stable delivery of phosphoric acid medium during the extraction process, while simultaneously solving the emulsification, corrosion, and leakage problems inherent in traditional pump bodies.

[0025] The pump body 1, as the core pressure-bearing component, is connected to the front guard plate 3 at its front end by high-strength bolts, and to the connecting plate 5 at its rear end by bolts. A sealing surface is provided between the front guard plate 3 and the rear guard plate 4, and an O-ring 13 is installed on this sealing surface to ensure that the phosphoric acid medium does not leak from here. The rear guard plate 4 is tightly clamped between the mating surface of the pump body 1 and the connecting plate 5, and is firmly pressed and fixed when the connecting bolts are tightened. The front guard plate 3 and the rear guard plate 4 are wear parts. This design allows the front guard plate 3 and the rear guard plate 4 to be easily replaced individually after wear or corrosion, effectively protecting the pump body 1 from damage and significantly reducing maintenance costs.

[0026] The connecting plate 5 is tightly connected to the shaft bracket 8 by a ring of high-strength double-ended studs. The shaft bracket 8 consists of a bracket cover 801 and a bracket body 802 welded together, with the connecting shaft 803 extending outward from the side wall of the bracket body 802. The connecting plate 5 has a precision-machined concentric arc-shaped stop, and the top surface of the connecting shaft 803 fits tightly with this arc-shaped stop, ensuring that the center lines of the drive end bearing 10 and the pump end bearing 11 are automatically aligned with the center line of the pump body 1. This structure not only improves the system's operational stability and reduces vibration and noise caused by misalignment, but also enhances the overall rigidity.

[0027] The rotating shaft 9 is supported by a drive-end bearing 10 and a pump-end bearing 11. Both bearings are clearance-fitted to the bracket cover 801 and their axial movement is restricted by the bearing cover 12; the inner ring is interference-fitted to the rotating shaft 9, allowing for the transmission of large torque and load without additional fasteners. The impeller 2 is mounted at the end of the rotating shaft 9 and fixed by a threaded connection, a connection method that is low in processing and assembly costs and easy to disassemble. Finally, the motor drives the rotating shaft 9 to rotate the impeller 2 at high speed, creating a low-pressure zone at the inlet, drawing phosphoric acid into the pump body; most of the kinetic energy is then converted into pressure energy, causing the medium to be discharged from the pump outlet at a higher pressure.

[0028] The filter assembly 14 is located at the pump inlet flange and is used to intercept small particulate impurities entering the pump. It consists of a housing 14-1, an inlet pipe 14-2, an outlet pipe 14-3, a positioning ring 14-4, a filter element 14-5, and a cover 14-6. The inlet pipe 14-2 is installed at the bottom outer side of the housing 14-1, and the outlet pipe 14-3 is installed at the top inner side and connected to the inlet end of the pump body 1. The top of the housing 14-1 is connected to the cover 14-6 by threads, and the positioning ring 14-4 is located inside near the top. The bottom of the cover 14-6 is threaded to the filter element 14-5, which passes through the positioning ring 14-4 from top to bottom, and its outer wall fits tightly with the positioning ring 14-4. Liquid flows in from the bottom side inlet pipe 14-2 and passes through the filter element 14-5 from bottom to top. This design facilitates venting and makes full use of the outer surface of the filter element for filtration. Filter element 14-5 is made of PTFE membrane material with a filtration accuracy of up to 0.5μm. It can effectively intercept tiny particles, eliminate emulsification causes from the source, reduce the cost of demulsifiers, and ensure that the raw materials for subsequent processes are clean and uncontaminated.

[0029] The mechanical seal 6, a key component preventing leakage of phosphoric acid, is installed on the mechanical seal housing 7. It mainly comprises a rotating ring 6-1, a stationary ring 6-2, a sealing ring 6-3, a spring 6-4, a bushing 6-5, and a gland 6-6. The bushing 6-5 is fixed to the rotating shaft 9 by fastening screws and rotates synchronously with the shaft 9. The rotating ring 6-1 is connected to the bushing 6-5 via a drive pin and is driven to rotate. The spring 6-4 is compressed between the spring seat and the rotating ring 6-1, providing continuous thrust to advance the rotating ring 6-1 forward. The gland 6-6 is bolted to the mechanical seal housing 7, serving as a stationary base. The stationary ring 6-2 is embedded in the cavity of the gland 6-6 by an anti-rotation pin to prevent it from rotating with the rotating shaft 9. The rotating ring 6-1 and the stationary ring 6-2 are tightly fitted together under the action of spring force, forming the main sealing interface. Simultaneously, sealing rings 6-3 are provided between the rotating ring 6-1 and the bushing 6-5, between the stationary ring 6-2 and the gland 6-6, between the bushing 6-5 and the end face of the impeller 2, between the bushing 6-5 and the end face of the bracket cover 801, and between the gland 6-6 and the mechanical seal housing 7, providing secondary static sealing protection. This mechanical seal structure reduces leakage to an extremely low level, achieving "zero visible leakage," effectively preventing the leakage of harmful media and meeting green production requirements.

[0030] In summary, this invention achieves precise control and management of the fluid during the extraction of refined phosphoric acid by optimizing the design of each component and their interrelationships. The silicon carbide flow-through components (including the pump body 1, impeller 2, front guard plate 3, and rear guard plate 4) ensure excellent corrosion resistance; the high-precision filter assembly 14 and the double-end mechanical seal 6 work synergistically to solve emulsification problems at the source and eliminate leakage risks. This pump body is suitable for the harsh operating conditions of industrial to electronic grade phosphoric acid production, significantly improving the economy, reliability, and environmental friendliness of the equipment.

[0031] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, the inventive aspect lies in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0032] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0033] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of this invention and form different embodiments.

[0034] It should be noted that the above embodiments are illustrative of the present invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0035] 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 pump for phosphoric acid refining extraction process, comprising a pump body (1), characterized by: The pump body (1) is connected to a filter assembly (14) at its inlet end. The filter assembly (14) includes a housing (14-1), an inlet pipe (14-2), an outlet pipe (14-3), a positioning ring (14-4), a filter element (14-5), and a cover (14-6). The inlet pipe (14-2) is installed at the bottom of the outer side of the housing (14-1), and the outlet pipe (14-3) is installed at the top of the inner side and connected to the inlet end of the pump body (1). The cover (14-6) is threaded to the top of the housing (14-1). The positioning ring (14-4) is located near the top of the housing (14-1). The filter element (14-5) is threaded to the bottom of the cover (14-6). The filter element (14-5) passes through the positioning ring (14-4) from top to bottom, and the outer wall of the filter element (14-5) is tightly fitted with the positioning ring (14-4).

2. The pump for the refined phosphoric acid extraction process according to claim 1, characterized in that: The filter element (14-5) is a PTFE membrane filter element.

3. The pump for the refined phosphoric acid extraction process according to claim 1, characterized in that: The front end of the pump body (1) is connected to the front guard plate (3) by bolts, and the rear end is connected to the connecting plate (5) by bolts. The rear guard plate (4) is tightly clamped on the joint surface between the pump body (1) and the connecting plate (5). An O-ring (13) is installed at the joint surface between the pump body (1) and the rear guard plate (4).

4. The pump for the refined phosphoric acid extraction process according to claim 3, characterized in that: The impeller (2) is rotatably installed inside the pump body (1). The connecting plate (5) is connected to the shaft bracket (8) by bolts. The shaft (9) is rotatably installed on the shaft bracket (8). One end of the shaft (9) is connected to the motor, and the other end extends into the pump body (1) and is threadedly connected to the impeller (2).

5. The pump for the refined phosphoric acid extraction process according to claim 4, characterized in that: The rotating bracket (8) includes a bracket cover (801) and a bracket body (802) that are welded and fixed together. A connecting shaft (803) extends outward from the side wall of the bracket body (802). An arc-shaped stop is provided on the connecting plate (5). The top surface of the connecting shaft (803) fits tightly with the arc-shaped stop.

6. The pump for the refined phosphoric acid extraction process according to claim 5, characterized in that: The rotating shaft (9) is rotatably mounted on the bracket cover (801) via a drive end bearing (10) and a pump end bearing (11). The drive end bearing (10) and the pump end bearing (11) are clearance-fitted with the bracket cover (801), and the inner rings of the drive end bearing (10) and the pump end bearing (11) are interference-fitted with the rotating shaft (9).

7. The pump for the refined phosphoric acid extraction process according to claim 5, characterized in that: The bracket cover (801) is equipped with bearing covers (12) at both ends, and the pump body (1), impeller (2), front guard plate (3), and rear guard plate (4) are made of silicon carbide.

8. The pump for the refined phosphoric acid extraction process according to claim 3, characterized in that: An organic seal box (7) is installed between the rear guard plate (4) and the connecting plate (5), and a mechanical seal (6) is detachably connected to the organic seal box (7).

9. The pump for the refined phosphoric acid extraction process according to claim 8, characterized in that: The mechanical seal (6) includes a rotating ring (6-1), a stationary ring (6-2), a sealing ring (6-3), a spring (6-4), a bushing (6-5), and a gland (6-6). The gland (6-6) is fixedly connected to the mechanical seal housing (7) by bolts. The bushing (6-5) is sleeved on the rotating shaft (9) and fixedly connected by fastening screws. The rotating ring (6-1) is connected to the bushing (6-5) by a drive pin. The stationary ring (6-2) is embedded in the cavity of the gland (6-6) by an anti-rotation pin. The spring (6-4) pushes the rotating ring (6-1) so that the rotating ring (6-1) and the stationary ring (6-2) fit tightly together.

10. The pump for the refined phosphoric acid extraction process according to claim 9, characterized in that: A sealing ring (6-3) is provided between the moving ring (6-1) and the bushing (6-5), between the stationary ring (6-2) and the gland (6-6), between the bushing (6-5) and the end face of the impeller (2), and between the bushing (6-5) and the end face of the bracket cover (801).

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