A highly corrosion-resistant magnetic gear pump

Abstract

This invention provides a highly corrosion-resistant magnetic gear pump, comprising a pump body, a magnetic coupling, and a cavity. One end of the magnetic coupling is connected to the pump body. The cavity is located at the front end of the pump body, and a gear chamber is formed in the middle of the cavity. A meshing driving gear and a driven gear are installed within the gear chamber. The driving gear includes a main shaft and a main gear mounted on the main shaft. The driven gear includes a driven shaft and a driven gear mounted on the driven shaft. Both the main gear and the driven gear are helical gears. One end of the main shaft of the driving gear is connected to the magnetic coupling. Both the driving gear and the driven gear are made of Teflon material. By using Teflon material for the driving gear, driven gear, pump body, and cavity—all components in contact with the liquid—this invention significantly increases corrosion resistance and extends service life. Furthermore, the helical gear meshing of the driving gear and driven gear improves the liquid delivery rate and provides more accurate liquid measurement.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, specifically to a magnetic gear pump resistant to strong corrosion. Background Technology

[0002] Most gear pumps on the market currently use packing seals or mechanical seals. These types of seals are prone to frequent leaks during long-term operation, thus failing to meet environmental and safety requirements. In contrast, magnetic centrifugal pumps are completely leak-free and are therefore widely used for transporting various flammable, explosive, toxic, harmful, and valuable liquid media.

[0003] A magnetic gear pump is a positive displacement gear pump that achieves contactless torque transmission through a magnetic drive, replacing dynamic seals with static seals to achieve a completely leak-free pump. It mainly consists of a gear pump head, a magnetic coupling, a motor, and a connecting base plate. When the motor drives the outer magnetic rotor to rotate, the magnetic field can penetrate the air gap and non-magnetic materials, driving the inner magnetic rotor connected to the drive gear to rotate synchronously, achieving contactless synchronous power transmission. It is an ideal device for conveying flammable, explosive, volatile, toxic, rare and precious liquids and various corrosive liquids. It is suitable for conveying fluids with a certain degree of lubricity that do not contain solid particles and fibers in various industrial processes.

[0004] Most existing magnetic gear pumps are made of metal. When pumping difficult-to-handle chemical media, such as inorganic acids, alkalis and salts, and liquids containing precious metals such as hydrochloric acid, sulfuric acid, nitric acid, chromic acid, hydrofluoric acid, ferric chloride, sodium hypochlorite and sodium hydroxide, as well as high-purity media that require separation from metal materials, they cannot effectively transport or are simply incapable of handling them. Due to deficiencies in design, processing and materials, their corrosion resistance is low. In addition, the existing drive gear and driven gear generally use a spur gear meshing connection, and the meshing force between the drive and driven gears is insufficient. Their accuracy, metering level, circulation efficiency, transmission performance and installation and maintenance are difficult to meet the requirements of current production and life. The pump and gears wear very severely, maintenance is difficult, operating costs are high, and the pump efficiency is low, resulting in a short service life and limited application. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a highly corrosion-resistant magnetic gear pump that can extend its service life and improve its operational cycle.

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

[0007] A highly corrosion-resistant magnetic gear pump includes a pump body, a magnetic coupling, and a cavity. The magnetic coupling is connected to the pump body at one end, and the cavity is located at the front end of the pump body. A gear cavity is formed in the middle of the cavity, and a driving gear and a driven gear are installed inside the gear cavity. One end of the main shaft of the driving gear is connected to the magnetic coupling. Both the driving gear and the driven gear are made of Teflon material. The driving gear includes a main shaft and a main gear, with the main gear mounted on the main shaft. The driven gear includes a driven shaft and a driven gear, with the driven gear mounted on the driven shaft. Both the main gear and the driven gear are helical gear structures, and they mesh with each other using a helical gear meshing method.

[0008] Furthermore, the bottom end of the pump body is provided with two positioning pins, and the rear end of the cavity is supported by a sealing cover. The cavity and the sealing cover have positioning cavities corresponding to the positioning pin positions. The positioning pins are inserted into the positioning cavities and then locked by screws to connect the pump body, the cavity and the sealing cover together.

[0009] Furthermore, the pump body, cavity, and sealing cover are all made of Teflon material.

[0010] Furthermore, the pump body has an inlet and an outlet on both sides of the waist section, which are radially connected. The inlet and outlet are interchangeable and are connected to the gear cavity of the pump body.

[0011] Furthermore, the pump body has an annular lower sealing ring groove on its end face, and a sealing ring is provided in the lower sealing ring groove. The cavity has an annular upper sealing ring groove on its bottom surface, and a sealing ring is also provided in the upper sealing ring groove. The two sealing rings are pressed together at the connection surface between the pump body and the cavity and surround the outside of the gear cavity.

[0012] Furthermore, the sealing ring is a silicone rubber ring.

[0013] Furthermore, the magnetic coupling is cylindrical in shape and includes an outer shell, an inner magnet, an outer magnet, a shield, and a mounting plate. The outer shell is connected to the drive motor via bearings. The outer magnet is located inside the outer shell. The shield is fixed to the front end of the pump body via the mounting plate. The inner magnet is located inside the shield and is fixedly connected to the main shaft of the drive gear.

[0014] Furthermore, the shielding cover is made of Teflon material.

[0015] Furthermore, the inner magnet is composed of multiple strong magnets, which form a ring structure and are disposed on the inner wall of the shielding cover.

[0016] Furthermore, the lower edge of the shielding cover is provided with an outwardly extending annular rim, and the mounting plate is an annular plate. The inner ring diameter of the mounting plate is larger than the outer diameter of the shielding cover but smaller than the outer diameter of the annular rim. Several screw holes are provided on the annular surface of the mounting plate. The shielding cover passes through the inner ring of the mounting plate, and the mounting plate presses the annular rim of the shielding cover onto the pump body and fixes it with screws.

[0017] Furthermore, the mounting plate is made of stainless steel.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention uses Teflon material to make the driving gear, driven gear, pump body, and other liquid-contacting components, which greatly increases corrosion resistance and extends service life. At the same time, the driving gear and driven gear are made of helical gear meshing to improve the liquid delivery rate and make the liquid metering more accurate. Attached Figure Description

[0020] Figure 1 This is a perspective view of the highly corrosion-resistant magnetic gear pump described in this utility model.

[0021] Figure 2 This is an exploded view of the highly corrosion-resistant magnetic gear pump described in this utility model;

[0022] Figure 3 This is a cross-sectional view of the highly corrosion-resistant magnetic gear pump described in this utility model. Detailed Implementation

[0023] 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.

[0024] like Figures 1-3 As shown, a highly corrosion-resistant magnetic gear pump includes a pump body 1, a magnetic coupling 2, and a cavity 3. The magnetic coupling 2, pump body 1, and cavity 3 are connected in sequence. One end of the magnetic coupling 2 is connected to the pump body 1, and the other end of the magnetic coupling 2 is connected to an external drive motor. The magnetic coupling 2 serves to connect the shaft and transmit torque.

[0025] The cavity 3 is attached to the front end of the pump body 1. Two positioning pins 13 are provided at the bottom end of the pump body 1. Correspondingly, a sealing cover 4 is attached to the rear end of the cavity 3. The sealing cover 4 seals the axial surface of the cavity 3. Positioning cavities (not shown in the figure) are formed in the cavity 3 and the sealing cover 4 at the positions corresponding to the positioning pins 13. The positioning pins 13 are inserted into the positioning cavities to connect and position the pump body 1, the cavity 3, and the sealing cover 4. After aligning the pump body 1, the cavity 3, and the sealing cover 4 with the positioning pins, they are then locked together with screws, thus connecting the pump body 1, the cavity 3, and the sealing cover 4 together. The pump body 1, the cavity 3, and the sealing cover 4 are all made of Teflon material. The pump body 1 is designed to have strong corrosion resistance. Two radially arranged sections on the waist of the pump body 1 are provided with an inlet 14 and an outlet 15, which are interchangeable. An annular lower sealing groove 12 is provided on the end face of the pump body 1, and a sealing ring 121 is provided in the lower sealing groove 12. An annular upper sealing groove (not shown in the figure) is provided on the bottom surface of the cavity 3, and a sealing ring 121 is also provided in the upper sealing groove. The sealing ring 121 is a silicone fluoropolymer ring, which has strong corrosion resistance. The two sealing rings 121 are pressed together at the connection surface between the pump body 1 and the cavity 3 and surround the outside of the gear cavity 33, serving a sealing function.

[0026] A gear cavity 33 is provided in the middle of the cavity 3. The inlet 14 and outlet 15 are both connected to the gear cavity 33 of the cavity 3. A driving gear 31 and a driven gear 32 are installed in the gear cavity 33 and mesh with each other. The driving gear 31 includes a main shaft 311 and a main gear 312. The main gear 312 is mounted on the main shaft 311. Preferably, the main shaft 311 and the main gear 312 are of an integral structure. One end of the main shaft 311 of the driving gear 31 is connected to a magnetic coupling 2, and the magnetic coupling 2 drives the main shaft 311 to rotate. The driven gear 32 includes a driven shaft 321 and a driven gear 322. The driven gear 322 is mounted on the driven shaft 321. Preferably, the driven shaft 321 and the driven gear 322 are of an integral structure of the pump body 1. The main gear 312 and the driven gear 322 mesh with each other. The permanent magnet inner rotor of the internal magnetic drive motor is connected to the main gear 312 through the main shaft 311. The transmission connection enables liquid transport when the drive gear 31 and driven gear 32 rotate. To enhance corrosion resistance, both the drive gear 31 and driven gear 32 are made of Teflon material. Experiments show that the corrosion resistance of the drive gear 31 and driven gear 32 made of Teflon material is significantly enhanced, resulting in a much longer service life. However, the liquid transport rate is significantly reduced, with a maximum flow rate of only 15 ml / s. To solve this problem and improve the transport rate, the main gear 312 and driven gear 322 adopt a helical gear structure. The main gear 312 and driven gear 322 mesh together in a helical gear meshing manner, which has a stronger meshing force and can significantly improve the liquid transport rate. Tests have shown that the flow rate using the helical gear meshing method can reach a maximum of 45 ml / s, with accurate measurement and a high repeatability of ±0.1%, thus achieving a precise transport effect.

[0027] The magnetic coupling 2 is cylindrical in shape and includes an outer shell 21, an inner magnet 22, an outer magnet 23, a shielding cover 24, and a mounting plate 25. The outer shell 21 is annular and made of aluminum alloy. It is connected to the drive motor via bearings. The outer magnet 23 is located inside the outer shell 21, and the inner magnet 22 is located inside the shielding cover 24. The inner magnet 22 consists of multiple strong magnets arranged in a ring on the inner wall of the shielding cover 24. The shielding cover 24 is made of Teflon material for strong corrosion resistance. The inner magnet 22 and outer magnet 23 can be made of stainless steel combined with neodymium iron boron or samarium cobalt magnets, featuring high temperature, high pressure, high magnetic force, and high torque, ensuring zero leakage and no pulsation. The inner magnet 22 is connected to the main shaft 31 of the drive gear 31. 1. Fixed connection: When the drive motor drives the outer magnet 23 to rotate, it drives the inner magnet 22 under the action of magnetic force. Then, the inner magnet 22 drives the drive gear 31 to rotate together, realizing the rotational meshing of the drive gear 31 and the driven gear 32. The shield 24 is fixed to the front end of the pump body 1 by the mounting plate 25. Specifically, the lower edge of the shield 24 is provided with an outwardly extending annular cover edge 241. The mounting plate 25 is an annular plate made of stainless steel. The inner ring diameter of the mounting plate 25 is larger than the outer diameter of the shield 24 but smaller than the outer diameter of the annular cover edge 241. The ring surface of the mounting plate 25 is provided with several screw holes. The shield 24 passes through the inner ring of the mounting plate 25. The mounting plate 25 presses the annular cover edge 241 of the shield 24 onto the pump body 1 and fixes it with screws, thereby firmly connecting the shield 24 to the top surface of the pump body 1.

[0028] The working principle of this utility model is as follows:

[0029] The drive motor drives the outer magnet 23 to rotate. The magnetic force of the outer magnet 23 generates a rotational driving force during rotation, which drives the inner magnet 22 to rotate. The inner magnet 22 then drives the drive gear 31 to rotate together, realizing the rotational meshing of the drive gear 31 and the driven gear 32 to generate negative pressure. As a result, the relatively low-pressure fluid is drawn into the gear cavity 33 through the inlet 14. After being pressurized by the two gears, the high-pressure fluid is discharged from the outlet 15, completing the fluid delivery. Since the drive gear 31 and the driven gear 32 adopt a helical gear meshing method, their meshing force is stronger, which can significantly improve the liquid delivery rate. According to the test, the flow rate of the helical gear meshing method can reach up to 45 ml / s, which is not much different from the 50 ml / s flow rate of the spur gear meshing method. Moreover, the measurement is more accurate, with a high repeatability of ±0.1%. At the same time, the drive gear 31, the driven gear 32, as well as the pump body 1 and the cavity 3 and other liquid contact parts are all made of Teflon material, which can greatly increase the corrosion resistance and improve the service life.

[0030] This invention uses Teflon material to make the driving gear, driven gear, pump body, and other liquid-contacting components, which greatly increases corrosion resistance and extends service life. At the same time, the driving gear and driven gear are made of helical gear meshing to improve the liquid delivery rate and make the liquid metering more accurate.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A strong corrosion resistant magnetic gear pump comprising a pump body, a magnetic coupling and a cavity, characterized in that: One end of the magnetic coupling is connected to the pump body, and the cavity is supported at the front end of the pump body. A gear cavity is opened in the middle of the cavity, and a driving gear and a driven gear that mesh with each other are installed in the gear cavity. The driving gear includes a main shaft and a main gear, and the main gear is mounted on the main shaft. The driven gear includes a driven shaft and a driven gear, and the driven gear is mounted on the driven shaft. Both the main gear and the driven gear are helical gear structures, and the main gear and the driven gear mesh with each other in a helical gear meshing manner. One end of the main shaft of the driving gear is connected to the magnetic coupling. Both the driving gear and the driven gear are made of Teflon material.

2. The magnetically geared pump of claim 1, wherein: The pump body has two positioning pins at the bottom end, and a sealing cover is attached to the rear end of the cavity. The cavity and the sealing cover have positioning cavities corresponding to the positioning pin positions. The positioning pins are inserted into the positioning cavities and then locked by screws to connect the pump body, the cavity and the sealing cover together. The pump body, the cavity and the sealing cover are all made of Teflon material.

3. The magnetically geared pump of claim 1, wherein: The pump body has an inlet and an outlet on both sides of the waist section, which are radially connected. The inlet and outlet are interchangeable and are connected to the gear cavity of the pump body.

4. The magnetically geared pump of claim 1, wherein: The pump body has an annular lower sealing ring groove on its end face, and a sealing ring is provided in the lower sealing ring groove. The cavity has an annular upper sealing ring groove on its bottom face, and a sealing ring is also provided in the upper sealing ring groove. The sealing rings are made of silicone fluoropolymer rings. The two sealing rings are pressed together at the connection surface between the pump body and the cavity and surround the outside of the gear cavity.

5. The magnetically geared pump of claim 1, wherein: The magnetic coupling is cylindrical in shape and includes an outer shell, an inner magnet, an outer magnet, a shield, and a mounting plate. The outer shell is connected to the drive motor via bearings. The outer magnet is located inside the outer shell. The shield is fixed to the front end of the pump body via the mounting plate. The inner magnet is located inside the shield. The shield is made of Teflon material. The inner magnet is fixedly connected to the main shaft of the drive gear.

6. The highly corrosive resistant magnetic gear pump of claim 5, wherein: The inner magnet is composed of multiple strong magnets, which form a ring structure on the inner wall of the shielding cover.

7. The highly corrosive resistant magnetic gear pump of claim 5, wherein: The lower edge of the shield has an outwardly extending annular rim. The mounting plate is an annular plate made of stainless steel. The inner diameter of the mounting plate is larger than the outer diameter of the shield but smaller than the outer diameter of the annular rim. Several screw holes are provided on the annular surface of the mounting plate. The shield passes through the inner ring of the mounting plate. The mounting plate presses the annular rim of the shield onto the pump body and fixes it with screws.

Images