Dilute sulfuric acid circulating pump with anti-corrosion function

Abstract

The utility model discloses a dilute sulphuric acid circulating pump with an anti-corrosion function, which belongs to the technical field of fluid machinery and comprises a base, a motor and a pump body are fixedly mounted at the top end of the base and fixedly connected through a pump shaft, one end of the pump shaft is fixedly connected with the output end of the motor, and the other end of the pump shaft is fixedly connected with the pump body. The other end of the pump shaft is located in the pump body and fixedly provided with an impeller, the outer wall of the pump shaft is fixedly sleeved with a sealing structure used for self-compensating abrasion, the sealing structure is fixedly connected with the pump body, liquid is effectively prevented from leaking from the joint of the pump shaft and the pump body through the sealing structure, and the movable ring and the static ring are tightly attached to form a first key sealing defense line. And meanwhile, when the movable ring is abraded due to long-term operation, the thrust spring pushes the pushing pipe to further push the movable ring so that the movable ring can be tightly attached to the static ring all the time, gap changes caused by abrasion can be automatically compensated, the good sealing effect can be continuously maintained, and the possibility of liquid leakage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluid machinery technology, specifically a dilute sulfuric acid circulating pump with anti-corrosion function. Background Technology

[0002] A dilute sulfuric acid circulating pump is a device specifically designed to transport and circulate dilute sulfuric acid solutions. It is mainly used in industries such as chemical, metallurgical, and environmental protection. It relies on the centrifugal force generated by the high-speed rotation of the impeller to throw the dilute sulfuric acid in the pump from the center of the impeller to the outer edge, thereby gaining kinetic energy. When it flows through the volute pump casing, some of the kinetic energy is converted into static pressure energy, and it is finally transported out at a certain pressure, thus realizing the circulating transport of dilute sulfuric acid.

[0003] During equipment operation, there is a certain risk of material leakage at the connection between the pump shaft and the pump body. Once leakage occurs, it will not only cause material loss, but the leaked liquid will also corrode the surrounding equipment and pipelines, seriously threatening the personal safety of operators.

[0004] Currently, most dilute sulfuric acid circulating pumps are ordinary horizontal centrifugal pumps, and the shaft seals use ordinary single-end mechanical seals. However, due to the extremely corrosive nature of dilute sulfuric acid, the equipment is prone to frequent leakage, which seriously affects the normal operation of the equipment and safe production. Utility Model Content

[0005] The purpose of this invention is to provide a dilute sulfuric acid circulating pump with anti-corrosion function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dilute sulfuric acid circulating pump with anti-corrosion function includes a base. A motor and a pump body are fixedly installed on the top of the base. The motor and the pump body are fixedly connected by a pump shaft. One end of the pump shaft is fixedly connected to the output end of the motor. The other end of the pump shaft is located in the pump body and an impeller is fixedly installed thereon. A sealing structure for self-compensating wear is fixedly sleeved on the outer wall of the pump shaft, and the sealing structure is fixedly connected to the pump body. The sealing structure effectively prevents liquid leakage from the connection between the pump shaft and the pump body.

[0008] As a further embodiment of this utility model, the sealing structure includes a stationary ring, which is fixedly installed in the inner cavity of the pump body. A rotating ring is fixedly sleeved on the outside of the pump shaft. The rotating ring and the stationary ring are in contact with each other and both are used to prevent liquid leakage. A compensation structure is fixedly installed on the outside of the rotating ring to ensure that the rotating ring and the stationary ring are in contact. When the rotating ring wears due to long-term operation, the sealing structure continuously provides a stable driving force to the rotating ring, ensuring that the rotating ring and the stationary ring always maintain a tight fit and effectively prevent liquid leakage.

[0009] As a further embodiment of this utility model, the compensation structure includes a fixed tube, which is fixedly sleeved on the outer surface of the pump shaft. An outer cover tube is fixedly sleeved on the outer wall of the fixed tube, and a thrust spring is fixedly installed on the inner wall of the outer cover tube. A push tube for pushing the moving ring is fixedly installed at one end of the thrust spring.

[0010] As a further embodiment of this utility model, a protrusion for assisting the smooth movement of the push tube is fixedly installed on the outer wall of the push tube, and a moving groove for providing movement for the protrusion is opened on the inner wall of the outer cover tube, and the protrusion is located in the moving groove, thereby restricting the movement direction of the push tube and preventing the push tube from deviating or shaking during the movement.

[0011] As a further embodiment of this utility model, the sealing structure also includes a positioning ring, which is fixedly installed on the outer wall of the outer cover tube. A fixing ring is fixedly sleeved on the outer wall of the stationary ring. A sealing strip is rotatably connected to the inner cavity of the positioning ring, and one end of the sealing strip is rotatably connected to the fixing ring.

[0012] As a further embodiment of this utility model, the inner cavity of the fixing ring is provided with a rotating groove for providing rotation of the sealing strip, and the end of the sealing strip away from the positioning ring is located in the rotating groove. One side of the rotating groove is provided with an inclined surface for preventing the sealing strip from falling off.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. When this utility model is used, the rotating ring and the stationary ring are tightly fitted together to form the first key sealing line. With the help of the EPDM rubber sealing ring, the good corrosion resistance and sealing performance of the material are utilized to further enhance the sealing performance between the rotating and stationary rings. Multiple protections prevent liquid leakage and provide a basic guarantee for the sealing of the equipment. At the same time, when the rotating ring wears due to long-term operation, the thrust spring pushes the push tube, which in turn pushes the rotating ring to keep it in close contact with the stationary ring. It can automatically compensate for the gap changes caused by wear and continuously maintain a good sealing effect, further reducing the possibility of liquid leakage.

[0015] 2. When this utility model is in use, the outer cover tube drives the positioning ring to rotate, so that under the action of centrifugal force, the iron ring pulls the sealing strip to fit against the inclined surface of the rotating groove, changing from a horizontal state to a bent state, which better fills the sealing gap, further enhances the sealing effect, effectively resists the leakage of corrosive liquids such as dilute sulfuric acid, stably performs the sealing function, reduces the frequency of mechanical seal leakage, and extends the service life of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a dilute sulfuric acid circulating pump with anti-corrosion function.

[0017] Figure 2 This is a cross-sectional view of the pump body in a dilute sulfuric acid circulating pump with anti-corrosion function.

[0018] Figure 3 This is a cross-sectional view of the sealing structure in a dilute sulfuric acid circulating pump with anti-corrosion function.

[0019] Figure 4 This is a split diagram of the dynamic and stationary rings in a dilute sulfuric acid circulating pump with anti-corrosion function.

[0020] Figure 5 This is a detailed diagram of the sealing structure in a dilute sulfuric acid circulating pump with anti-corrosion properties.

[0021] In the diagram: 1. Base; 2. Motor; 3. Pump body; 4. Pump shaft; 5. Impeller; 601. Stationary ring; 602. Rotary ring; 603. Sealing ring; 604. Fixed pipe; 605. Outer cover pipe; 606. Thrust spring; 607. Push pipe; 608. Protrusion; 609. Positioning ring; 610. Fixed ring; 611. Sealing strip; 612. Iron ring; 7. Support frame. Detailed Implementation

[0022] 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 protection scope of the present utility model.

[0023] Example 1: Please refer to Figure 1 , Figure 2 A dilute sulfuric acid circulating pump with anti-corrosion function includes a base 1. The top of the base 1 is fixedly mounted with a motor 2 and a pump body 3 by bolts. The motor 2 and the pump body 3 are fixedly connected by a pump shaft 4. One end of the pump shaft 4 is fixedly connected to the output end of the motor 2, and the other end of the pump shaft 4 is located inside the pump body 3 and is fixedly mounted with an impeller 5. The outer wall of the pump shaft 4 is fixedly fitted with a sealing structure for self-compensating wear, and the sealing structure is fixedly connected to the pump body 3. The sealing structure effectively prevents liquid from leaking from the connection between the pump shaft 4 and the pump body 3.

[0024] Specifically, the pump body 3 is made of Hastelloy alloy, which can be used stably in complex dilute sulfuric acid environments with high temperature, high concentration and oxidizing liquid, and has excellent corrosion resistance. The outer wall of the pump shaft 4 is rotatably fitted with a support frame 7 for supporting the pump shaft 4, and the support frame 7 is fixedly connected to the upper surface of the base 1 by bolts.

[0025] Please see Figures 2-4The sealing structure includes a stationary ring 601, which is fixedly installed in the inner cavity of the pump body 3. A rotating ring 602 is fixedly sleeved on the outside of the pump shaft 4. The rotating ring 602 and the stationary ring 601 are in contact with each other and are used to prevent liquid leakage. A compensation structure is fixedly installed on the outside of the rotating ring 602 to ensure that the rotating ring 602 and the stationary ring 601 are in contact. When the rotating ring 602 wears due to long-term operation, the sealing structure continuously provides a stable driving force to the rotating ring 602, ensuring that the rotating ring 602 and the stationary ring 601 always maintain a tight contact state and effectively prevent liquid leakage.

[0026] Both the stationary ring 601 and the rotating ring 602 have sealing rings 603 fixedly installed in their inner cavities to enhance sealing performance, and the two sets of sealing rings 603 are in contact with each other. Both sets of sealing rings 603 are made of EPDM rubber.

[0027] The compensation structure includes a fixed tube 604, which is fixedly sleeved on the outer surface of the pump shaft 4. An outer cover tube 605 is fixedly sleeved on the outer wall of the fixed tube 604. A thrust spring 606 is fixedly installed on the inner wall of the outer cover tube 605. A push tube 607 for pushing the moving ring 602 is fixedly installed at one end of the thrust spring 606.

[0028] Specifically, the push tube 607 is fixedly sleeved on the outer wall of the moving ring 602, and the inner cavity of the outer cover tube 605 is provided with a sliding cavity for providing the push tube 607 to slide. The push tube 607 is located in the sliding cavity. Multiple sets of thrust springs 606 are provided, and a multi-spring layout is adopted to effectively reduce the risk of off-center load.

[0029] The outer wall of the push tube 607 is fixedly equipped with a protrusion 608 to assist the push tube 607 in moving smoothly. The inner wall of the outer cover tube 605 is provided with a moving groove for providing movement of the protrusion 608, and the protrusion 608 is located in the moving groove, thereby restricting the movement direction of the push tube 607 and preventing the push tube 607 from deviating or shaking during movement.

[0030] Example 2: Please refer to Figure 3 , Figure 5 Based on Embodiment 1, the sealing structure also includes a positioning ring 609, which is fixedly installed on the outer wall of the outer cover tube 605. A fixing ring 610 is fixedly sleeved on the outer wall of the stationary ring 601, and the stationary ring 601 is fixedly connected to the pump body 3 through the fixing ring 610. A sealing strip 611 is rotatably connected to the inner cavity of the positioning ring 609, and one end of the sealing strip 611 is rotatably connected to the fixing ring 610.

[0031] Specifically, the sealing strip 611 is made of EPDM rubber, and iron rings 612 are fixedly installed at both ends of the inner cavity of the sealing strip 611. The inner cavity of the fixing ring 610 is provided with a slot for engaging the iron rings 612, and one set of iron rings 612 is engaged in the slot.

[0032] The inner cavity of the fixed ring 610 is provided with a rotating groove for the sealing strip 611 to rotate, and the end of the sealing strip 611 away from the positioning ring 609 is located in the rotating groove. One side of the rotating groove is provided with an inclined surface to prevent the sealing strip 611 from falling off. The positioning ring 609 is driven to rotate by the outer cover tube 605, which drives the sealing strip 611 to rotate accordingly. Under the high-speed rotation of the outer cover tube, centrifugal force is generated, and the iron ring 612 will tend to move outward. Since the iron ring 612 is connected to the sealing strip 611, it will pull the sealing strip 611 to gradually fit against the inclined surface of the rotating groove, so that it changes from a horizontal state to a bent state. The bent sealing strip 611 can better fill the sealing gap, further enhance the sealing effect, effectively resist the leakage of corrosive liquids such as dilute sulfuric acid, and ensure the safe and stable operation of the pump body 3 under harsh working conditions. At the same time, the inclined surface of the rotating groove ensures that the sealing strip 611 is always constrained in the rotating groove during the movement, ensuring that it can stably perform its sealing function.

[0033] The working principle of this utility model is as follows:

[0034] First, the motor 2 is powered on and starts, driving the pump shaft 4 to rotate at high speed, which in turn drives the impeller 5 located in the pump body 3 to rotate together. The high-speed rotation of the impeller 5 generates centrifugal force, causing the dilute sulfuric acid in the pump body 3 to be thrown from the center of the impeller 5 to the outer edge under the action of centrifugal force, thereby gaining kinetic energy. When the dilute sulfuric acid with kinetic energy flows through the volute pump body 3, part of the kinetic energy is converted into static pressure energy, and finally it is delivered out at a certain pressure, completing the circulation and transportation of dilute sulfuric acid. In addition, the pump body 3 is made of Hastelloy alloy material to ensure stable operation of the pump body 3 under harsh working conditions and extend its service life.

[0035] At the same time, the dynamic ring 602 and the stationary ring 601 are in close contact, forming the first line of sealing defense to prevent liquid from leaking from the connection between the pump shaft 4 and the pump body 3. When the dynamic ring 602 wears due to long-term operation, the thrust spring 606 pushes the push tube 607, which in turn pushes the dynamic ring 602, so that it always keeps in close contact with the stationary ring 601, further strengthening the sealing effect of the equipment and reducing the possibility of liquid leakage.

[0036] Finally, the outer casing tube 605 drives the positioning ring 609 to rotate, and the sealing strip 611 rotates accordingly. Under the centrifugal force generated by the high-speed rotation of the outer casing tube 605, the iron ring 612 moves outward, pulling the sealing strip 611 to fit against the inclined surface of the rotating groove, changing it from a horizontal state to a bent state, better filling the sealing gap, enhancing the sealing effect, effectively reducing the frequency of mechanical seal leakage, and extending the service life of the equipment.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dilute sulfuric acid circulating pump with anti-corrosion function, comprising a base (1), characterized in that, The top of the base (1) is fixedly installed with a motor (2) and a pump body (3). The motor (2) and the pump body (3) are fixedly connected by a pump shaft (4). One end of the pump shaft (4) is fixedly connected to the output end of the motor (2). The other end of the pump shaft (4) is located inside the pump body (3) and is fixedly installed with an impeller (5). The outer wall of the pump shaft (4) is fixedly fitted with a sealing structure for self-compensating wear, and the sealing structure is fixedly connected to the pump body (3). The sealing structure effectively prevents liquid from leaking from the connection between the pump shaft (4) and the pump body (3).

2. The dilute sulfuric acid circulating pump with anti-corrosion function according to claim 1, characterized in that, The sealing structure includes a stationary ring (601), which is fixedly installed in the inner cavity of the pump body (3). A rotating ring (602) is fixedly sleeved on the outside of the pump shaft (4). The rotating ring (602) and the stationary ring (601) are in close contact and are used to prevent liquid leakage. A compensation structure is fixedly installed on the outside of the rotating ring (602) to ensure that the rotating ring (602) and the stationary ring (601) are in close contact. When the rotating ring (602) wears due to long-term operation, the sealing structure continuously provides a stable driving force to the rotating ring (602), ensuring that the rotating ring (602) and the stationary ring (601) always maintain a tight fit and effectively prevent liquid leakage.

3. A dilute sulfuric acid circulating pump with anti-corrosion function according to claim 2, characterized in that, The compensation structure includes a fixed tube (604), which is fixedly sleeved on the outer surface of the pump shaft (4). An outer cover tube (605) is fixedly sleeved on the outer wall of the fixed tube (604). A thrust spring (606) is fixedly installed on the inner wall of the outer cover tube (605). A push tube (607) for pushing the moving ring (602) is fixedly installed at one end of the thrust spring (606).

4. A dilute sulfuric acid circulating pump with anti-corrosion function according to claim 3, characterized in that, The outer wall of the push tube (607) is fixedly equipped with a protrusion (608) for assisting the push tube (607) to move smoothly. The inner wall of the outer cover tube (605) is provided with a moving groove for providing movement of the protrusion (608), and the protrusion (608) is located in the moving groove, thereby restricting the movement direction of the push tube (607) and preventing the push tube (607) from deviating or shaking during movement.

5. A dilute sulfuric acid circulating pump with anti-corrosion function according to claim 2, characterized in that, The sealing structure also includes a positioning ring (609), which is fixedly installed on the outer wall of the outer cover tube (605). A fixing ring (610) is fixedly sleeved on the outer wall of the stationary ring (601). A sealing strip (611) is rotatably connected to the inner cavity of the positioning ring (609), and one end of the sealing strip (611) is rotatably connected to the fixing ring (610).

6. A dilute sulfuric acid circulating pump with anti-corrosion function according to claim 5, characterized in that, The inner cavity of the fixing ring (610) is provided with a rotating groove for providing rotation of the sealing strip (611), and the end of the sealing strip (611) away from the positioning ring (609) is located in the rotating groove. One side of the rotating groove is provided with an inclined surface for preventing the sealing strip (611) from falling off.

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