Corrosion-resistant magnetic drive gear pump

Abstract

This utility model discloses a corrosion-resistant magnetically driven gear pump, relating to the field of corrosion-resistant gear pump technology. It includes a rotor cover, a holding tank, a rotor shaft, bearings, a drive gear, a sealing ring, a rotor cover, a sealing groove, a fluororubber ring, a support shaft, mounting holes, fastening screws, a placement groove, a connecting plate, and a positioning groove. The rotor cover and rotor cover are connected by fastening screws to form a closed cavity. The drive gears are symmetrically arranged within the cavity. The rotor shaft passes through the rotor cover and rotor cover, is supported at both ends by bearings, and is coaxially connected to the support shaft. The holding tank is located on the inner wall of the rotor cover. This corrosion-resistant magnetically driven gear pump, through its multi-layered rotor cover and rotor cover, achieves optimal coordination between the various components of the gear pump, enabling long-term stable operation under highly corrosive and high-temperature conditions, significantly extending its service life. It features a simple structure and strong practicality.

Description

Technical Field

[0001] This utility model relates to the field of corrosion-resistant gear pump technology, and in particular to a corrosion-resistant magnetically driven gear pump. Background Technology

[0002] A magnetically driven gear pump is a positive displacement pump that achieves contactless transmission through magnetic coupling. Its core consists of an outer magnetic rotor, an isolation casing, an inner magnetic rotor, and a gear pair. During operation, a motor drives the outer magnetic rotor to generate a rotating magnetic field. This magnetic field penetrates the isolation casing and drives the inner magnetic rotor to rotate synchronously, thereby driving the meshing power gears to transport the medium. As a leak-free fluid transport device, the magnetically driven gear pump is widely used in chemical, pharmaceutical, and other fields.

[0003] A search revealed a corrosion-resistant magnetically driven gear pump head (authorization announcement number: CN 208564954 U), which "comprising an inner rotor, a rotor cover, a PTFE sealing ring, a front cover, a drive gear, a driven gear, a fluororubber ring, a pump body, and a rear cover; the front cover, pump body, and rear cover are made of PPS engineering plastic; the rear cover encloses the driven gear, drive gear, and pump body between the rear cover and the front cover, and the inner edges of the cross-shaped through-slots of the front cover and rear cover intersecting with the pump body include fluororubber ring grooves with the same shape as the cross-shaped through-slots. This corrosion-resistant magnetically driven gear pump head uses two polyetheretherketone polyphenylene sulfide engineering plastic gears to generate a vacuum to drive strong acid or strong alkali liquids. Simultaneously, fluororubber rings are arranged at the points where the cross-shaped through-slots meet the front and rear covers, reinforcing the edges, preventing strong acid and alkali seepage, and preventing residual strong acid and alkali corrosion at the joint. The pump head is lightweight and highly corrosion-resistant."

[0004] Based on the aforementioned technologies, the applicant believes that the pump casings in the prior art are mostly single-layered, resulting in poor actual corrosion resistance and short service life in highly corrosive environments. To address these issues, we have developed a corrosion-resistant magnetically driven gear pump. Utility Model Content

[0005] This utility model discloses a corrosion-resistant magnetically driven gear pump, which aims to solve the technical problem that the pump body shell of the prior art is mostly single-layered, with poor actual corrosion resistance and short service life in highly corrosive environments.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a corrosion-resistant magnetically driven gear pump, comprising a rotor cover, a holding tank, a rotor shaft, bearings, a power gear, a sealing ring, a rotor cover, a sealing groove, a fluororubber ring, a support shaft, mounting holes, fastening screws, a mounting groove, a connecting plate, and a positioning groove. The rotor cover and the rotor cover are connected by fastening screws to form a closed cavity. The power gears are symmetrically arranged inside the cavity. The rotor shaft passes through the rotor cover and the rotor cover, and is supported at both ends by bearings and coaxially connected to the support shaft. The holding tank is located on the inner wall of the rotor cover and communicates with the sealing groove. A fluororubber ring is embedded in the sealing groove. The connecting plate has symmetrically arranged positioning grooves inside, and the connecting plate is connected to the outside through the positioning grooves.

[0007] A sealed cavity is formed by the fastening screws connecting the rotor cover and rotor shroud, and with the symmetrically arranged power gears, leakage-free conveying is achieved; the coaxial design of the rotor shaft and the support shaft ensures transmission accuracy, the connected structure of the holding tank and the sealing tank can collect the leaked medium, and the positioning groove of the connecting plate enables quick and accurate installation.

[0008] In a preferred embodiment, both the rotor cover and the rotor shield adopt a three-layer composite structure, consisting of an inner liner, an intermediate barrier layer, and an outer pressure-bearing layer from the inside out. The inner liner is made of a high-temperature resistant polymer material, the intermediate barrier layer is a composite layer of metal foil and elastomer, and the outer pressure-bearing layer is mainly made of fiber-reinforced composite material with an embedded reinforcing skeleton.

[0009] By using a multi-layered rotor cover and rotor shield, the gear pump achieves seamless cooperation between its components, enabling long-term stable operation under highly corrosive and high-temperature conditions, thus greatly extending its service life. The structure is simple and highly practical.

[0010] In a preferred embodiment, the metal foil of the intermediate barrier layer is fixed to the inner liner layer by a high-pressure bonding process, and a thermal expansion compensation gap is provided between the outer pressure-bearing layer and the intermediate barrier layer.

[0011] High-pressure bonding process ensures no interface defects between the metal foil and the inner liner, and thermal expansion compensation gap eliminates temperature difference stress, avoiding interlayer peeling failure.

[0012] In a preferred embodiment, the depth of the sealing groove is greater than the compression deformation of the fluororubber ring, and the bottom of the sealing groove is provided with a medium guiding channel communicating with the holding tank.

[0013] The depth of the sealing groove is greater than the compression of the fluororubber ring to ensure reliable sealing and prevent localized corrosion.

[0014] In a preferred embodiment, the mating end of the support shaft and the rotor shaft is provided with an axial positioning structure, and the positioning groove is a guide groove that cooperates with the axial positioning structure.

[0015] The axial positioning structure works in conjunction with the guide groove to avoid direct contact between the metal shaft and eliminate the risk of galvanic corrosion.

[0016] In a preferred embodiment, the surface of the inner liner has a microporous structure, and the micropores are filled with a self-lubricating material.

[0017] The microporous structure stores self-lubricating materials, reduces the friction coefficient between the liner and the medium, and reduces corrosion initiation points caused by particle wear.

[0018] The corrosion-resistant magnetically driven gear pump provided by this utility model has the following advantages: First, through the multi-layered rotor cover and rotor cap, the various components of the gear pump are ultimately coordinated with each other, enabling long-term stable operation under strong corrosion and high temperature conditions, which greatly extends the service life. The structure is simple and the practicality is strong.

[0019] Secondly, the high-pressure bonding process ensures no interface defects between the metal foil and the inner liner, and the thermal expansion compensation gap eliminates temperature stress, preventing interlayer peeling failure. The sealing groove depth is greater than the compression of the fluororubber ring, ensuring sealing reliability and preventing localized corrosion. The axial positioning structure cooperates with the guide groove to avoid direct contact between the metal shaft and eliminate the risk of galvanic corrosion. The microporous structure stores self-lubricating material, reducing the friction coefficient between the inner liner and the medium, and reducing corrosion initiation points caused by particle wear. Attached Figure Description

[0020] Figure 1 This is a three-dimensional exploded view of a corrosion-resistant magnetically driven gear pump proposed in this utility model.

[0021] Figure 2 This is a three-dimensional exploded view of a corrosion-resistant magnetically driven gear pump proposed in this utility model.

[0022] Figure 3 This is a schematic diagram of a corrosion-resistant magnetically driven gear pump proposed in this utility model.

[0023] Figure 4 This is a schematic diagram of a corrosion-resistant magnetically driven gear pump proposed in this utility model.

[0024] Figure 5 This is a schematic diagram of a corrosion-resistant magnetically driven gear pump proposed in this utility model.

[0025] Figure 6 This is a schematic diagram of a corrosion-resistant magnetically driven gear pump proposed in this utility model.

[0026] In the attached diagram: 1. Rotor cover; 2. Holding tank; 3. Rotor shaft; 4. Bearing; 5. Power gear; 6. Sealing ring; 7. Rotor cover; 8. Sealing groove; 9. Fluororubber ring; 10. Support shaft; 11. Mounting hole; 12. Fastening screw; 13. Placement groove; 14. Connecting plate; 15. Positioning groove; 16. Inner liner; 17. Intermediate barrier layer; 18. Outer pressure-bearing layer. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] The corrosion-resistant magnetically driven gear pump disclosed in this utility model is mainly used in corrosion-resistant gear pump applications.

[0029] Reference Figures 1-6 A corrosion-resistant magnetically driven gear pump includes a rotor cover 1, a holding tank 2, a rotor shaft 3, a bearing 4, a power gear 5, a sealing ring 6, a rotor cover 7, a sealing groove 8, a fluororubber ring 9, a support shaft 10, a mounting hole 11, a fastening screw 12, a placement groove 13, a connecting plate 14, and a positioning groove 15. The rotor cover 1 and the rotor cover 7 are connected by the fastening screw 12 to form a closed cavity. The power gear 5 is symmetrically arranged inside the cavity. The rotor shaft 3 passes through the rotor cover 1 and the rotor cover 7, and is supported at both ends by the bearing 4 and coaxially connected to the support shaft 10. The holding tank 2 is located on the inner wall of the rotor cover 1 and communicates with the sealing groove 8. The sealing groove 8 is embedded with a fluororubber ring 9. The connecting plate 14 has symmetrically arranged positioning grooves 15 inside, and the connecting plate 14 is connected to the outside through the positioning grooves 15. Both the rotor cover 1 and the rotor cover 7 adopt a three-layer composite structure, which consists of an inner liner 16, a middle barrier layer 17, and an outer pressure-bearing layer 18 from the inside out. The inner liner 16 is made of high-temperature resistant polymer material, the middle barrier layer 17 is a composite layer of metal foil and elastomer, and the outer pressure-bearing layer 18 is mainly made of fiber-reinforced composite material with an internal reinforcing skeleton.

[0030] In this embodiment: The motor drives the outer magnetic rotor to rotate via a coupling, generating an alternating magnetic field. This magnetic field drives the inner magnetic rotor to rotate synchronously. The inner magnetic rotor drives the rotor shaft 3 to rotate via a spline connection. Both ends of the rotor shaft 3 are supported by ceramic bearings 4, which drive the power gears 5 to mesh with each other. When the gears rotate, the meshing teeth create a volume change within the closed cavity formed by the rotor cover 1 and the rotor cap 7. A negative pressure is generated at the inlet side to draw in the medium, and the medium is squeezed at the outlet side to create a conveying pressure. The motor drives the outer magnetic rotor to rotate, generating a magnetic field. This magnetic field penetrates the isolation cover, driving the inner magnetic rotor and rotor shaft 3 to rotate synchronously. Corrosive media... The medium first comes into contact with the outer pressure-bearing layer 18, a composite material, whose internal stainless steel mesh skeleton provides structural support. If the medium penetrates the outer layer, it will be blocked by the tantalum foil in the middle barrier layer 17. The fluororubber layer buffers thermal stress, and the innermost liner layer 16 serves as the last line of defense. The self-lubricating material in its microporous structure can reduce the scouring and corrosion of the pump body wall by the medium. Through the multi-layered rotor cover 1 and rotor cap 7, the various components of the gear pump are finally coordinated with each other, enabling long-term stable operation under strong corrosion and high temperature conditions, greatly extending the service life. The structure is simple and highly practical.

[0031] In the above technical solution, considering that the existing pump body shell is mostly single-layered, resulting in poor corrosion resistance and a short service life in highly corrosive environments, the specific operation is as follows to solve this problem: (Refer to...) Figures 1-6 In a preferred embodiment, the metal foil of the intermediate barrier layer 17 is fixed to the inner liner layer 16 by a high-pressure bonding process, and a thermal expansion compensation gap is provided between the outer pressure-bearing layer 18 and the intermediate barrier layer 17. The depth of the sealing groove 8 is greater than the compression deformation of the fluororubber ring 9, and the bottom of the sealing groove 8 is provided with a medium guiding channel communicating with the holding tank 2. The mating end of the support shaft 10 and the rotor shaft 3 is provided with an axial positioning structure, and the positioning groove 15 is a guide groove that cooperates with the axial positioning structure. The surface of the inner liner layer 16 is provided with a microporous structure, and the micropores are filled with a self-lubricating agent.

[0032] In this embodiment: the high-pressure bonding process ensures no interface defects between the metal foil and the inner liner 16; the thermal expansion compensation gap eliminates temperature stress and avoids interlayer peeling failure. The depth of the sealing groove 8 is greater than the compression of the fluororubber ring 9, ensuring sealing reliability and preventing localized corrosion. The axial positioning structure cooperates with the guide groove to avoid direct contact between the metal shaft and eliminate the risk of galvanic corrosion. The microporous structure stores self-lubricating material, reducing the coefficient of friction between the inner liner 16 and the medium, and reducing corrosion initiation points caused by particle wear.

[0033] Working principle: The motor drives the outer magnetic rotor to rotate through the coupling, generating an alternating magnetic field. The magnetic field drives the inner magnetic rotor to rotate synchronously. The inner magnetic rotor drives the rotor shaft 3 to rotate through a spline connection. The two ends of the rotor shaft 3 are supported by ceramic bearings 4, which drive the power gears 5 to mesh with each other. When the gears rotate, the meshing teeth create a volume change in the closed cavity formed by the rotor cover 1 and the rotor cover 7. The inlet side generates negative pressure to draw in the medium, and the outlet side squeezes the medium to form a conveying pressure. The motor drives the outer magnetic rotor to rotate and generate a magnetic field. The magnetic field penetrates the isolation cover and drives the inner magnetic rotor and the rotor shaft 3 to rotate synchronously. The corrosive medium first comes into contact with the composite material of the outer pressure-bearing layer 18, whose internal stainless steel mesh skeleton provides structural support. If the medium penetrates the outer layer, it will be blocked by the tantalum foil of the middle barrier layer 17. The fluororubber layer buffers thermal stress, and the innermost liner layer 16 serves as the last line of defense. The self-lubricating material in its surface microporous structure can reduce the scouring and corrosion of the pump body wall by the medium, ultimately achieving long-term stable operation under strong corrosion and high temperature conditions.

[0034] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A corrosion-resistant magnetically driven gear pump, comprising a rotor cover (1), a holding tank (2), a rotor shaft (3), a bearing (4), a power gear (5), a sealing ring (6), a rotor cover (7), a sealing groove (8), a fluororubber ring (9), a support shaft (10), a mounting hole (11), a fastening screw (12), a placement groove (13), a connecting plate (14), and a positioning groove (15), characterized in that: The rotor cover (1) and rotor cover (7) are connected by fastening screws (12) to form a closed cavity. The cavity is symmetrically provided with power gears (5). The rotor shaft (3) passes through the rotor cover (1) and rotor cover (7), and is supported at both ends by bearings (4) and coaxially connected with the support shaft (10). The holding groove (2) is located on the inner wall of the rotor cover (1) and communicates with the sealing groove (8). The sealing groove (8) is embedded with a fluororubber ring (9). The connecting plate (14) is symmetrically provided with positioning grooves (15) inside. The connecting plate (14) is connected to the outside through the positioning grooves (15).

2. The corrosion-resistant magnetically driven gear pump according to claim 1, characterized in that: The rotor cover (1) and rotor cap (7) both adopt a three-layer composite structure, which consists of an inner liner (16), a middle barrier layer (17), and an outer pressure-bearing layer (18) from the inside to the outside. The inner liner (16) is made of high-temperature resistant polymer material, the middle barrier layer (17) is a composite layer of metal foil and elastomer, and the outer pressure-bearing layer (18) is mainly made of fiber-reinforced composite material with an internal reinforcing skeleton.

3. The corrosion-resistant magnetically driven gear pump according to claim 2, characterized in that: The metal foil of the intermediate barrier layer (17) is fixed to the inner liner layer (16) by a high-pressure bonding process, and a thermal expansion compensation gap is provided between the outer pressure-bearing layer (18) and the intermediate barrier layer (17).

4. The corrosion-resistant magnetically driven gear pump according to claim 1, characterized in that: The depth of the sealing groove (8) is greater than the compression deformation of the fluororubber ring (9), and the bottom of the sealing groove (8) is provided with a medium guiding channel that communicates with the holding groove (2).

5. A corrosion-resistant magnetically driven gear pump according to claim 1, characterized in that: The supporting shaft (10) and the rotor shaft (3) are provided with an axial positioning structure at their docking ends, and the positioning groove (15) is a guide groove that cooperates with the axial positioning structure.

6. A corrosion-resistant magnetically driven gear pump according to claim 2, characterized in that: The inner lining layer (16) has a microporous structure on its surface, and the micropores are filled with a self-lubricating material.

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