Fluid transmission pump and fluid storage and transmission device

Abstract

The utility model discloses a fluid transmission pump, which belongs to the field of medium transmission and comprises a power component, a permanent magnet rotor component, a shaft system component and a pump transmission component. The permanent magnet rotor assembly comprises an isolation sleeve, a permanent magnet outer rotor and a permanent magnet inner rotor, the isolation sleeve covers the permanent magnet inner rotor, a gap exists between the isolation sleeve and the permanent magnet inner rotor, the isolation sleeve is of a double-layer structure, an induction cavity is formed between the double-layer structure, and the induction cavity is connected with a pressure sensing component. The utility model further discloses a fluid storage and transmission device with the fluid transmission pump. According to the utility model, the functions of shaft-seal-free magnetic transmission, medium zero-leakage conveying and seal monitoring of fluid media are realized.

Description

Technical Field

[0001] This utility model relates to the field of media transmission technology, and in particular to a fluid transmission pump, and also to a fluid storage and transmission device having the fluid transmission pump. Background Technology

[0002] In fluid transport equipment, various pump types all suffer from transmission shaft sealing issues. Transmission shafts come in two forms: magnetic seals and mechanical seals. Mechanical seals are dynamic seals, using various types of sealing rings to seal the rotating shaft radially and axially, allowing the medium to flow axially. However, over time, mechanical seals are prone to leakage, causing pollution to the working environment, posing safety risks, and requiring frequent maintenance. Magnetic seals consist of a permanent magnet inner rotor, a permanent magnet outer rotor, and an isolation sleeve. The isolation sleeve seals the permanent magnet inner rotor and the medium within the working chamber. A motor drives the permanent magnet outer rotor, which in turn drives the permanent magnet inner rotor using magnetic coupling characteristics. This achieves contactless torque transmission and static sealing, completely eliminating medium leakage and overcoming the shortcomings of mechanical seals.

[0003] To achieve a leak-free seal, magnetic sealing is required, and magnetic drive pumps solve the leakage problem in fluid transportation. For leak-free transportation of harmful and corrosive media, AC motor-driven magnetic drive pumps are commonly used. However, for leak-free transportation of highly toxic and corrosive media, conventional magnetic drive pumps still face problems such as leakage, bearing wear, and axial force imbalance. Utility Model Content

[0004] The main objective of this invention is to provide a fluid transfer pump that solves the leakage problem that may occur in existing magnetic drive pumps during fluid transfer.

[0005] The purpose of this invention is also to provide a fluid storage and transmission device.

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

[0007] In a first aspect, the present invention provides a fluid transfer pump, including a power component, a permanent magnet rotor component, a shaft system component, and a pump transfer component;

[0008] The permanent magnet rotor assembly includes an isolation sleeve and a permanent magnet outer rotor and a permanent magnet inner rotor positioned opposite each other;

[0009] The permanent magnet outer rotor is connected to the power assembly;

[0010] The permanent magnet inner rotor is connected to the shaft assembly.

[0011] The pump transmission assembly is disposed on the shaft system assembly;

[0012] The isolation sleeve covers the permanent magnet inner rotor and there is a gap between the isolation sleeve and the permanent magnet inner rotor. The isolation sleeve has a double-layer structure, and there is a sensing cavity between the double-layer structure. The sensing cavity is connected to a pressure sensing component.

[0013] Furthermore, the power assembly includes a motor, which is fixedly connected to the permanent magnet outer rotor via a coupling.

[0014] Furthermore, the coupling and the permanent magnet outer rotor are fitted with fixedly connected bushings and brackets.

[0015] Furthermore, an upper spacer is fitted onto the permanent magnet outer rotor with a clearance fit, and alloy rolling bearings are connected to both ends of the upper spacer. The two alloy rolling bearings are fitted onto the permanent magnet outer rotor.

[0016] Furthermore, the shaft assembly includes a shaft and a chuck, the shaft is fixedly connected to the permanent magnet inner rotor, the chuck is fixedly connected to the isolation sleeve to form a cooling cavity, the permanent magnet inner rotor is located in the cooling cavity, and the shaft passes through the chuck.

[0017] Furthermore, the chuck is provided with a cooling medium inlet channel and a cooling medium outlet channel that are connected to the cooling cavity, and a cooling channel is provided on the shaft along its axial direction. The two ends of the cooling channel are respectively connected to the cooling medium inlet channel and the cooling medium outlet channel.

[0018] Furthermore, an upper seat plate and a lower seat plate are respectively fitted at both ends of the shaft, and an upper alloy sliding bearing assembly and a lower alloy sliding bearing assembly fitted on the shaft are respectively provided in the upper seat plate and the lower seat plate.

[0019] Furthermore, a lower spacer sleeve is fitted over the middle of the shaft.

[0020] Furthermore, the pump transmission assembly includes a pump body and an impeller. The pump body is fixedly connected to the permanent magnet rotor assembly to form a transmission space. The shaft system assembly is located within the transmission space, and the impeller is fixedly connected to the shaft system assembly.

[0021] Secondly, this utility model also provides a fluid storage and transfer device, including a tank and a fluid transfer pump as described above. The upper part of the tank has an upper liquid inlet and a lower liquid outlet, and the fluid transfer pump is disposed at the upper liquid inlet of the tank and extends into the interior of the tank.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This utility model discloses a fluid transfer pump and a fluid storage and transfer device incorporating the pump, achieving shaftless magnetic transmission, zero-leakage transport, and sealing monitoring of fluid media. Specifically, the double-layer structure of the isolation sleeve and pressure sensing components enable static sealing of the media and leakage alarm for a single-layer isolation sleeve. The internal fluid circulation is used to cool and lubricate the transmission components. It features complete sealing, zero leakage, no pollution, low vibration, and low noise, extending the service life of the equipment, ensuring the working stability of the fluid transfer system, and improving transmission efficiency. It is suitable for leak-free transport of flammable, explosive, toxic, and rare and valuable fluid media (such as liquid chlorine) that do not contain ferromagnetic substances or hard solid particles, and can be widely used in petroleum, chemical, pharmaceutical, and environmental protection industries. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the fluid transfer pump of this utility model;

[0025] Figure 2 This is a schematic diagram of the permanent magnet rotor assembly of the fluid transfer pump of this utility model.

[0026] Figure 3 This is a schematic diagram of the shaft system assembly of the fluid transfer pump of this utility model;

[0027] Figure 4 This is a schematic diagram of the fluid storage and transmission device of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the fluid storage and transmission device of this utility model;

[0029] Figure 6 This is a schematic diagram of the tank of the fluid storage and transmission device of this utility model.

[0030] In the diagram: 1. Motor, 2. Motor bracket, 3. Outlet pipe, 4. Pressure sensing component, 5. Chassis, 6. Diaphragm coupling, 7. Bushing, 8. Tank body, 9. Bracket, 10. Upper partition sleeve, 11. Permanent magnet outer rotor, 12. Intermediate sleeve, 13. Permanent magnet inner rotor, 14. Upper base plate, 15. Upper alloy sliding bearing assembly, 16. Shaft, 17. Lower partition sleeve, 18. Chuck, 19. Lower alloy sliding bearing assembly, 20. Lower base plate, 21. Impeller, 22. Bottle ring, 23. Pump body. Detailed Implementation

[0031] 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.

[0032] Example 1

[0033] See Figure 1 This embodiment discloses a fluid transfer pump, including a power component, a permanent magnet rotor component, a shaft system component, and a pump transfer component, specifically:

[0034] See Figure 2 The permanent magnet rotor assembly includes an isolation sleeve 12 and a permanent magnet outer rotor 11 and a permanent magnet inner rotor 13 positioned opposite each other;

[0035] The permanent magnet external rotor 11 is connected to the power assembly;

[0036] The permanent magnet inner rotor 13 is connected to the shaft system assembly;

[0037] The pump transfer assembly is located within the shaft assembly;

[0038] The isolation sleeve 12 covers the permanent magnet inner rotor and there is a gap between the isolation sleeve 12 and the permanent magnet inner rotor. The isolation sleeve 12 has a double-layer structure, and the hollow space between the double-layer structure forms a sensing cavity. The sensing cavity is connected to the pressure sensing component 4.

[0039] Specifically, the permanent magnet inner rotor 13 and the permanent magnet outer rotor 11 are permanent magnet structures with stainless steel outer coverings, preventing the permanent magnet inner rotor 13 from contacting the internal fluid. The isolation sleeve 12 is a non-rotating component, completely isolating the permanent magnet inner rotor 13 and the internal fluid from the permanent magnet outer rotor 11, thus transforming the dynamic seal into a static seal. The permanent magnet outer rotor 11 drives the permanent magnet inner rotor 13 to rotate through magnetic coupling characteristics, completing non-contact torque transmission. The double-layer structure of the isolation sleeve 12 has a double-layer protection function, does not raise the temperature of the internal fluid, ensures stable magnetic operation of the system, and improves transmission efficiency. The pressure sensing component is connected to the internal sensing cavity of the isolation sleeve 12 to realize single-layer isolation sleeve leakage alarm. Even if the single-layer isolation sleeve leaks, it can still ensure that the medium is completely sealed without leakage.

[0040] In this embodiment, the fluid transfer pump transmits the power generated by the power component to the shaft assembly without contact through the permanent magnet rotor assembly, causing the shaft assembly to rotate. The shaft assembly then drives the pump transfer assembly to do work, thus driving the fluid to be transferred.

[0041] For example, the power assembly in this embodiment includes a motor 1, which is fixedly connected to a permanent magnet external rotor 11 via a coupling. More specifically, the motor 1 is mounted on a motor bracket 2 to ensure that its position does not shift during operation. In this embodiment, a diaphragm coupling 6 is selected. The diaphragm coupling compensates for the relative displacement of the two connected shafts by the elastic deformation of the diaphragm. It is a high-performance flexible metal element coupling that does not require lubrication, has a compact structure, high strength, long service life, no rotational backlash, is unaffected by temperature and oil contamination, and has the characteristics of acid and alkali resistance and corrosion resistance. It is suitable for shaft transmission in high-temperature, high-speed, and corrosive media environments.

[0042] Furthermore, the coupling and the permanent magnet outer rotor 11 are externally fitted with a fixedly connected bushing 7 and bracket 9. The sealed connection between the bushing 7 and bracket 9 ensures that the coupling and the permanent magnet outer rotor 11 inside will not come into contact with the transmitted fluid, thus preventing damage to the aforementioned components.

[0043] Preferably, the motor bracket 2 is fixedly connected to the bushing 7. This embodiment also includes a chassis 5 with an opening, on which the motor bracket 2 is disposed and fixedly connected. The chassis 5 facilitates the mounting of the fluid transfer pump of this embodiment on the fluid storage device to be transferred.

[0044] Furthermore, an upper spacer 10 is fitted onto the permanent magnet outer rotor 11 with a clearance fit. Two alloy rolling bearings are connected to both ends of the upper spacer 10, and these two alloy rolling bearings are fitted onto the permanent magnet outer rotor 11. Specifically, the permanent magnet outer rotor 11 can be fixed to the bracket 9 to form the active component by connecting a lock nut and the alloy rolling bearings. The upper spacer 10 is fixed to the permanent magnet outer rotor 11 with a reasonable clearance to position the two alloy rolling bearings. The alloy rolling bearings have corrosion-resistant and wear-resistant dry friction characteristics, ensuring long-term use of this transfer pump under harsh operating conditions.

[0045] See Figure 3 Furthermore, the shaft assembly includes a shaft 16 and a chuck 18. The shaft 16 is fixedly connected to the permanent magnet inner rotor 13, and the chuck 18 is fixedly connected to the isolation sleeve 12 to form a cooling cavity. The permanent magnet inner rotor 13 is located in the cooling cavity, and the shaft 16 passes through the chuck 18. The chuck 18 can prevent a large amount of transmission medium from entering the isolation sleeve 12 and causing damage to the isolation sleeve and the permanent magnet inner rotor 13.

[0046] Preferably, the chuck 18 has a cooling medium inlet channel and a cooling medium outlet channel communicating with the cooling cavity, and the shaft 16 has a cooling channel arranged along its axial direction, with its two ends connected to the cooling medium inlet channel and the cooling medium outlet channel, respectively. During operation, a small amount of transport medium can enter the cooling cavity through the cooling medium inlet channel on the chuck 18 to cool the permanent magnet inner rotor 13. At the same time, the transport medium flows through the cooling channel on the shaft 16 to cool the shaft 16, and then the transport medium is discharged from the cooling cavity through the cooling medium outlet channel.

[0047] Furthermore, an upper bearing plate 14 and a lower bearing plate 20 are respectively fitted onto both ends of the shaft 16. An upper alloy sliding bearing assembly 15 and a lower alloy sliding bearing assembly 19, respectively, are respectively installed within the upper bearing plate 14 and the lower bearing plate 20 and fitted onto the shaft 16. Specifically, both the upper alloy sliding bearing assembly 15 and the lower alloy sliding bearing assembly 19 are combined structures of radial alloy sliding bearings and axial alloy thrust bearings, capable of withstanding axial and radial forces generated by irregular movement of the medium, and possessing corrosion-resistant and wear-resistant dry friction characteristics.

[0048] Furthermore, a lower spacer 17 is fitted onto the middle of the shaft 16. The two ends of the lower spacer 17 contact the upper alloy sliding bearing assembly 15 and the lower alloy sliding bearing assembly 19, respectively, for limiting and fixing them. Correspondingly, the lower spacer 17 has small holes that connect the cooling channel and the cooling medium outlet channel.

[0049] Furthermore, the pump transmission assembly includes a pump body 23 and an impeller 21. An outlet pipe 3 is connected to the pump body 23. The pump body 23 is fixedly connected to the permanent magnet rotor assembly to form a transmission space. The shaft 16 is located in the transmission space, and the impeller 21 is fixedly connected to the shaft 16.

[0050] Furthermore, the pump transmission assembly in this embodiment also includes a mouth ring 22. The mouth ring 22 is fixed between the impeller 21 and the pump body 23 with a reasonable fitting clearance. The mouth ring 22 has a radial positioning and sealing function for the mouth of the impeller 21. The sealing function of the mouth ring 22 can effectively prevent back leakage of the medium and ensure the efficient operation of the pump.

[0051] See Figure 1Specifically, in this embodiment, a radial alloy sliding bearing and an axial alloy thrust bearing are respectively installed in the upper plate 14, chuck 8, and lower plate 20 using a reasonable fit clearance. The upper plate 14 and lower plate 20 are respectively fixed to the shaft 16 and impeller 21 using a reasonable fit clearance connection. The lower spacer 17 is fixed to the shaft 16 using a reasonable fit clearance connection to position the lower alloy sliding bearing assembly 19 and the upper alloy sliding bearing assembly 15. The permanent magnet inner rotor 13 and the shaft 16 are connected as a single unit using a round nut and a key to form a passive component. The isolation sleeve 12 and the chuck 18 are connected as a single unit using screws and sealing rings to form a static seal, ensuring no leakage of internal fluid. The bracket 9, the chuck 18, and the pump body 23 are connected as a single unit using screws and sealing rings to form the lower pump chamber and the upper magnetic rotor assembly sheath. The impeller 21 and the shaft 16 are connected as a single unit using a round nut and a key to form a single unit, forming a working component. The outlet pipe 3 and pump body 23 are connected as a single unit using screws and sealing rings to discharge fluid. The outlet pipe 3 and chassis 5 are sealed and welded together. The pressure sensing component 4 and isolation sleeve 12 are connected as a single unit using welding to lead out the detection signal. The pressure sensing component 4 has a protective sleeve, which is sealed and welded to chassis 5. The shaft sleeve 7 and bracket 9 are connected as a single unit using screws and sealing rings. The shaft sleeve 7 and motor bracket 2 are connected as a single unit using screws and sealing rings. The motor bracket 2 and chassis 5 are connected as a single unit using screws. The motor 1 and motor bracket 2 are connected as a single unit using screws. The motor 1 provides power for fluid transmission. The diaphragm coupling 6, motor 1, and permanent magnet external rotor 11 are connected as a single unit using a key connection to input power. The diaphragm coupling 6 is an extended type coupling. The pump body 23 is a single-layer vertical structure with a single-stage centrifugal pump casing.

[0052] See Figure 4During operation, motor 1 drives the permanent magnet outer rotor 11 to rotate at high speed via diaphragm coupling 6. Due to the magnetic field between the permanent magnet inner rotor 13 and the permanent magnet outer rotor 11, the permanent magnet outer rotor 11 drives the permanent magnet inner rotor 13 inside the isolation sleeve 12 to rotate synchronously through magnetic coupling characteristics, and drives the shaft 16 to rotate, transmitting the torque of motor 1 to impeller 21 without contact. The rotation of shaft 16 drives impeller 21 to do work on the medium. The medium is axially drawn in from the lower inlet (indicated by the arrow) and radially flows out from the lower outlet (indicated by the arrow), and then discharged through outlet pipe 3 to achieve medium transportation. The isolation sleeve 12 is a non-rotating part, which can ensure no leakage of internal fluid. At the same time, the double-layer isolation sleeve 12 equipped with pressure sensing components can realize single-layer isolation sleeve leakage alarm, providing double-layer protection function. The high-pressure medium exiting the pump flows upward through the cooling medium on the chuck 18 into the cooling chamber formed by the isolation sleeve 12 and the permanent magnet inner rotor 13. It then flows downward along the cooling channel of the central hole of the shaft 16, exits through the small hole of the lower partition sleeve 17, and flows out again through the cooling medium outlet channel on the chuck 18, flowing downward into the back of the impeller 21 to achieve self-lubrication of the process fluid and cool the transmission components. In case of overload, the permanent magnet inner rotor 13 and the permanent magnet outer rotor 11 slip relative to each other, protecting the motor 1. The high-efficiency variable frequency servo characteristics of the motor 1 ensure the normal operation of the transfer pump in this embodiment.

[0053] Example 2

[0054] See Figures 4-6 This embodiment discloses a fluid storage and transfer device, including a container II and a transfer pump I from Embodiment 1. The container II consists of a tank body 8, an upper inlet, a bottom outlet, and various detection indicators, serving as a container-type support component for the pump of Embodiment 1, providing functions for media storage and detection. The upper inlet is the inlet for the media to enter the container II, and the bottom outlet is the outlet for the media to exit the container II. Both the upper inlet and the bottom outlet are integrally connected to the tank body 8 by sealed welding. This embodiment is used for storing and transferring liquid chlorine; therefore, the tank body 8 is a low-pressure container composed of sheet metal welded parts. The tank body 8 has various display indicators to ensure the normal operation of the transfer pump I, such as indicators for starting minimum liquid level, operating minimum liquid level, and a level gauge.

[0055] For example, the chassis 5 of the transfer pump I and the tank 8 of the container II can be connected as a single unit by bolts.

[0056] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fluid transfer pump, characterized in that, Includes power components, permanent magnet rotor components, shaft system components, and pump transmission components; The permanent magnet rotor assembly includes an isolation sleeve and a permanent magnet outer rotor and a permanent magnet inner rotor positioned opposite each other; The permanent magnet outer rotor is connected to the power assembly; The permanent magnet inner rotor is connected to the shaft assembly. The pump transmission assembly is disposed on the shaft system assembly; The isolation sleeve covers the permanent magnet inner rotor and there is a gap between the isolation sleeve and the permanent magnet inner rotor. The isolation sleeve has a double-layer structure, and there is a sensing cavity between the double-layer structure. The sensing cavity is connected to a pressure sensing component.

2. The fluid transfer pump according to claim 1, characterized in that, The power assembly includes a motor, which is fixedly connected to the permanent magnet outer rotor via a coupling.

3. The fluid transfer pump according to claim 2, characterized in that, The coupling and the permanent magnet outer rotor are fitted with fixedly connected bushings and brackets.

4. The fluid transfer pump according to claim 1, characterized in that, The permanent magnet outer rotor is fitted with an upper spacer sleeve with a clearance fit. The two ends of the upper spacer sleeve are respectively connected to alloy rolling bearings, and the two alloy rolling bearings are fitted onto the permanent magnet outer rotor.

5. The fluid transfer pump according to claim 1, characterized in that, The shaft assembly includes a shaft and a chuck. The shaft is fixedly connected to the permanent magnet inner rotor. The chuck is fixedly connected to the isolation sleeve to form a cooling cavity. The permanent magnet inner rotor is located in the cooling cavity. The shaft passes through the chuck.

6. The fluid transfer pump according to claim 5, characterized in that, The chuck has a cooling medium inlet channel and a cooling medium outlet channel that are connected to the cooling cavity. A cooling channel is provided on the shaft along its axial direction. The two ends of the cooling channel are respectively connected to the cooling medium inlet channel and the cooling medium outlet channel.

7. The fluid transfer pump according to claim 5, characterized in that, An upper plate and a lower plate are respectively fitted at both ends of the shaft, and an upper alloy sliding bearing assembly and a lower alloy sliding bearing assembly are respectively fitted onto the shaft in the upper plate and the lower plate.

8. The fluid transfer pump according to claim 7, characterized in that, A lower spacer sleeve is fitted in the middle of the shaft.

9. The fluid transfer pump according to claim 1, characterized in that, The pump transmission assembly includes a pump body and an impeller. The pump body is fixedly connected to the permanent magnet rotor assembly to form a transmission space. The shaft assembly is located within the transmission space, and the impeller is fixedly connected to the shaft assembly.

10. A fluid storage and transport device, characterized in that, The device includes a tank and a fluid transfer pump as described in any one of claims 1-9, wherein the upper part of the tank has an upper inlet and a lower outlet, and the fluid transfer pump is disposed at the upper inlet of the tank and extends into the interior of the tank.

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