High-temperature magnetic drive pump for conveying belt particle mixed liquid

Abstract

The utility model provides a high-temperature magnetic drive pump for conveying belt particle mixed liquid, which comprises an external circulation filtering cooling loop, a pump body, an impeller, an inner transmission shaft, an inner transmission shaft sleeve, a pump body isolation plate, a lubrication isolation cavity, an inner magnetic rotor connected to the inner transmission shaft, an isolation sleeve, an outer magnetic rotor and an outer transmission shaft, the inner transmission shaft drives the inner magnetic rotor to move, and the inner magnetic rotor drives the impeller in the pump body to rotate through the inner transmission shaft; the inner magnetic rotor is isolated from the pump body and the impeller through the lubrication isolation cavity and the pump body isolation plate; and the inner transmission shaft and the inner transmission shaft sleeve adopt a connecting structure with a backflow groove gap. According to the high-temperature magnetic drive pump for conveying the particle mixed liquid, lubricating and cooling are achieved through the designed outer circulation cooling loop, and conveying of the magnetic drive pump to high-temperature and high-pressure liquid with magnetic particles and ultrahigh-temperature liquid is achieved.

Description

Technical Field

[0001] This utility model relates to the field of magnetic pump technology, and in particular to a high-temperature magnetic pump for conveying a mixture of particles. Background Technology

[0002] A magnetic pump is a type of pump that uses the principle of magnetic coupling to transmit power. It uses a motor to drive a magnetic outer rotor, which transmits power to the driven inner magnetic rotor through the magnetic field. The rotation of the inner magnetic rotor drives the impeller to agitate the liquid, so that the liquid is drawn in from the inlet and discharged through the pump body. Since there is no mechanical transmission between the driving end and the driven end, it is easy to achieve high temperature and high pressure sealing.

[0003] Because magnetic pumps transmit power via magnetic force, there are strict limitations on the presence of magnetic or magnetizable particles in the pumped medium. Magnetic or magnetizable particles in the liquid, such as solid particles or magnetic microparticles, can easily accumulate on the pump's magnetic inner rotor, causing blockage. To prevent the influence of magnetic particles on the magnetic pump, a magnetic filter is typically installed in the pipeline to remove these particles, ensuring the liquid flowing through the pump is free of magnetic particles and guaranteeing stable operation. Chinese Patent 202311433391.1 employs a method of installing a magnetic filter inside the pump inlet. This magnetic filter pre-treats the pumped liquid, ensuring that the liquid flowing through the pump impeller is free of magnetic particles, representing a similar solution.

[0004] Using filtration to remove particulate or magnetic particles from fluids is only suitable for applications where the fluid carries a small amount of particulate or magnetic impurities. For fluids containing a large number of particulate or magnetic particles, or where the particulate or magnetic particles must be pumped and cannot be filtered out, the method of using filters in the pipeline is not applicable.

[0005] For magnetic pumps employing internal circulation lubrication and cooling systems, such as those described in Chinese Patent No. CN03218946.X, which have reflux holes on the rotating shaft and drainage ports in the bearing sleeve isolation cavity to directly introduce the pump body liquid into the inner magnetic rotor cavity for lubrication and cooling, it is difficult to prevent particulate matter or magnetic particles in the fluid from accumulating on the inner magnetic rotor, thus affecting the long-term operation of the pump. Due to limitations in the high-temperature resistance of the inner magnetic rotor magnets, using internal liquid and pump body structure cooling, based on existing technology, is very difficult to apply to conveying fluids exceeding 400°C.

[0006] To address the above problems, this invention employs a novel circulating lubrication structure, utilizing a designed external circulating cooling circuit to achieve lubrication and cooling, enabling the magnetic pump to transport liquids containing a large amount of particulate matter or magnetic particles, as well as ultra-high temperature and high pressure liquids. Utility Model Content

[0007] This invention provides a high-temperature magnetic pump for conveying a mixture of particles to overcome the deficiencies in the prior art.

[0008] This utility model provides a high-temperature magnetic pump for conveying a mixture of particles, including an external circulating filter cooling circuit, a pump body, an impeller, an inner drive shaft, an inner drive shaft sleeve, a pump body isolation plate, a lubrication isolation cavity, an inner magnetic rotor connected to the inner drive shaft, an isolation sleeve, an outer magnetic rotor, and an outer drive shaft. The outer drive shaft drives the outer magnetic rotor to rotate, thereby driving the inner magnetic rotor to move. The inner magnetic rotor drives the impeller inside the pump body to rotate through the inner drive shaft.

[0009] The internal magnetic rotor is isolated from the pump body and the impeller by the lubrication isolation cavity and the pump body isolation plate;

[0010] The pump body is provided with a cooling lubricant outlet, which is connected to the inlet of the lubrication isolation chamber through the external circulation filter cooling circuit.

[0011] The inner drive shaft and the inner drive shaft sleeve adopt a connection structure with a return groove gap. A small amount of lubricating fluid can flow back to the pump body through the lubrication isolation cavity and the gap of the return groove.

[0012] The lubrication isolation chamber is equipped with a lubricating coolant return port, which is connected to the inlet of the pump body through a return pipeline.

[0013] According to the present invention, a high-temperature magnetic pump for conveying particulate mixture is provided. The external circulation filtration cooling circuit includes a filter and a cooler. The filter is a magnetic filter with a built-in strong magnet, and the cooler is an air-cooled cooler. The external circulation cooling circuit is provided with a front shut-off valve and a rear shut-off valve.

[0014] According to the present invention, a high-temperature magnetic pump for conveying a granular mixture is provided, wherein the reflux groove between the inner drive shaft and the inner drive shaft sleeve has a spiral structure to increase the flow rate of the circulating reflux liquid and enhance the lubrication and cooling effect on the inner drive shaft and the inner drive shaft sleeve.

[0015] According to the present invention, a high-temperature magnetic pump for conveying a mixture of particles is provided, wherein the pump body isolation plate and the lubrication isolation cavity are disposed between the pump body, the impeller and the inner magnetic rotor, and the distance between the pump body and the inner magnetic rotor is greater than 50mm, so as to isolate the high temperature and reduce the influence of the magnetic field on the particles inside the pump body.

[0016] According to the present invention, a high-temperature magnetic pump for conveying a mixture of particles is provided. The return pipeline includes a connecting pipeline, a shut-off valve, and a check valve. The shut-off valve is used to control the return flow of the lubricating coolant, and the check valve is used to prevent liquid backflow.

[0017] According to the present invention, a high-temperature magnetic pump for conveying a mixed liquid of particles is provided. The filter is a filter group composed of a pre-filter and a fine filter. Both the pre-filter and the fine filter have built-in strong magnets to adsorb magnetic particles in the liquid.

[0018] This utility model provides a high-temperature magnetic pump for conveying liquids containing particles. It employs a designed external circulation cooling circuit for lubrication and cooling, enabling the pump to transport high-temperature, high-pressure, and ultra-high-temperature liquids containing magnetic particles. The pump body isolation plate and lubrication isolation chamber isolate the internal magnetic rotor from the liquid containing particles. Combined with the strong magnetic filtration and air cooling of the external circulation filtration cooling circuit, liquids containing a large number of particles (including magnetic particles) can be directly transported without filtration, avoiding particle adsorption and blockage. The spiral reflux groove enhances lubrication and cooling efficiency, and the thermal insulation design with an isolation gap exceeding 50mm overcomes the temperature resistance limitations of traditional magnetic pumps, allowing for stable transport of ultra-high-temperature and high-pressure liquids. Simultaneously, the weakened magnetic field structure prevents particle accumulation within the pump, and the contactless transmission reduces mechanical losses, significantly improving the reliability and service life of the equipment under harsh operating conditions, reducing maintenance costs, and broadening the application scenarios of magnetic pumps in chemical, energy, and other fields. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the outer circulation loop;

[0022] Figure 3 This is a schematic diagram of the coolant circulation loop;

[0023] Figure 4 This is a schematic diagram of the return pipeline.

[0024] Figure label:

[0025] 1. External circulation filter cooling circuit; 2. Pump body; 3. Impeller; 4. Inner drive shaft; 5. Inner drive shaft sleeve; 6. Pump body isolation plate; 7. Lubrication isolation chamber; 8. Inner magnetic rotor; 9. Isolation sleeve; 10. Outer magnetic rotor; 11. Outer drive shaft; 12. Return pipeline; 1-1. Front shut-off valve; 1-2. Pre-filter; 1-3. Fine filter; 1-4. Cooler; 1-5. Rear shut-off valve; 2-1. Cooling lubricant outlet; 2-2. Pump body coolant return inlet; 4-1. Spiral return groove; 7-1. Lubrication isolation chamber inlet; 7-2. Lubrication coolant return interface. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] like Figures 1-4As shown, a high-temperature magnetic pump for conveying magnetic particle liquid includes an external circulating filter cooling circuit 1, a pump body 2, an impeller 3, an inner drive shaft 4, an inner drive shaft sleeve 5, a pump body isolation plate 6, a lubrication isolation chamber 7, and an inner magnetic rotor 8 connected to the inner drive shaft 4, as well as an isolation sleeve 9; an outer magnetic rotor 10 and an outer drive shaft 11 constitute the pump body. The outer drive shaft 11 drives the outer magnetic rotor 10 to rotate, which in turn drives the inner magnetic rotor 10 to move. The inner magnetic rotor 10 drives the impeller 3 inside the pump body 2 to rotate via the inner drive shaft 4.

[0031] like Figure 1 As shown, the internal magnetic rotor 10 is isolated from the pump body 2 and impeller 3 through the lubrication isolation chamber 7 and the pump body partition 6. The pump body outlet is provided with a cooling lubricant outlet 2-1, which is connected to the inlet 7-1 of the lubrication isolation chamber 7 through an external circulation filter cooling pipeline 1.

[0032] like Figure 2 As shown, the external circulation filtration cooling circuit 1 includes a filter and a cooler 1-4. The filter can be a combination of a pre-filter 1-2 and a fine filter 1-3 to form a filter group. The filter is a magnetic filter with a strong magnet, consisting of a primary pre-filter 1-2 and a fine filter 1-3. The filter has a built-in strong magnet to adsorb any magnetic particles that may be present in the liquid passing through the cooling pipes. The external circulation cooling circuit 1 has a front shut-off valve 1-1 and a rear shut-off valve 1-5, allowing for periodic inspection and cleaning of the cooling circulation circuit 1. The cooler 1-4 is an air-cooled type, or it can be a jacketed air cooler.

[0033] The lubrication isolation chamber 7 is provided with a lubricating coolant return port 7-2, which is connected to the return pipeline 12 and the pump body inlet 2-2. The lubricating coolant return pipeline 12 includes connecting pipes, shut-off valves 12-1 and 12-2, and check valve 12-2.

[0034] The circulating lubricating coolant always flows in the predetermined direction from the external circulation filter cooling circuit 1 through the lubrication isolation chamber 7, and then returns to the lubrication coolant return port 7-2 via the lubrication coolant return pipe 12. This ensures that the liquid inside the lubrication isolation chamber is always a clean liquid with a controllable temperature, achieving sufficient cooling for the internal magnetic rotor 10 and the internal drive shaft 4.

[0035] like Figure 3 As shown, the pump body isolation plate and the lubrication isolation cavity are located between the pump body 2, impeller 3 and inner magnetic rotor 10. They are isolated by the lubrication isolation cavity 7 and the pump body isolation plate 6, with a distance greater than 50mm. This effectively isolates the high-temperature fluid in the pump body 2 from the temperature influence of the magnetic material in the inner magnetic rotor. At the same time, through a certain isolation distance and the isolation of the pump body isolation plate 6, the magnetic field of the magnetic material in the inner magnetic rotor at the impeller 3 and cavity in the pump body is weakened, preventing magnetic particles that may exist in the fluid from accumulating in the pump body impeller and cavity.

[0036] like Figure 4 As shown, the inner drive shaft 4 and the inner drive shaft sleeve 5 are designed as a rigid connection structure with a gap, and have a spiral return groove 4-1. A small amount of lubricating fluid passes through the lubrication isolation chamber 7, through the gap between the inner drive shaft 4 and the inner drive shaft sleeve 5 and the spiral return groove 4-1, and flows back into the pump body 2. The direction of coolant flow is always from the cooling lubricating fluid outlet 2-1 to the lubrication isolation chamber 7, and then through the gap and return groove 4-1 designed for the inner drive shaft 4 and the inner drive shaft sleeve 5, and enters the pump body 2. Even if the fluid in the pump body 2 contains particles, or even if the particles are magnetic, they will not enter the lubrication isolation chamber 7 and affect the normal operation of the inner magnetic rotor.

[0037] The working principle of this invention is as follows: Utilizing the pump outlet pressure being greater than the pump body pressure, the liquid at the pump outlet passes through the external circulation cooling circuit 1. Liquid that may contain magnetic particles is then filtered through primary and fine magnetic filters, ensuring that the liquid entering the lubrication isolation chamber 7 is a clean liquid free of particles. This clean liquid then flows back into the pump body through the gap between the inner drive shaft 4 and the inner drive shaft sleeve 5 of the inner magnetic rotor 8, forming a circulation. This small amount of circulating lubricating coolant effectively lubricates and cools the inner magnetic rotor 8 and the inner drive shaft 4. For conveying ultra-high temperature fluids, a coolant return pipeline is added, connected to the main body inlet. The pressure difference between the pump outlet and inlet increases cooling efficiency, enabling the coolant to circulate and cool fully within the lubrication isolation chamber 7.

[0038] The high-temperature magnetic pump of this invention achieves stable delivery of high-temperature, high-pressure liquids containing particles (especially magnetic particles) through three core mechanisms: magnetic coupling transmission, isolated lubrication and cooling, and circulating filtration and cooling. The outer drive shaft 11 is driven by a motor to rotate, which in turn drives the outer magnetic rotor 10 to rotate synchronously. The outer magnetic rotor 10 drives the inner magnetic rotor 8 to rotate through a magnetic field. The two are completely isolated by an isolation sleeve 9, eliminating mechanical contact and avoiding the leakage risk of traditional mechanical seals. The inner magnetic rotor 8 drives the impeller 3 inside the pump body 2 to rotate via the inner drive shaft 4, allowing liquid to be drawn in from the pump body inlet 2-2, pressurized by the impeller, and discharged from the outlet.

[0039] The pump body isolation plate 6 and the lubrication isolation chamber 7 completely isolate the inner magnetic rotor 8 from the pump body 2 and impeller 3, forming an independent lubrication and cooling space with a spacing greater than 50mm. This isolation design prevents liquid containing particles (especially magnetic particles) from directly contacting the inner magnetic rotor 8, avoiding particle adhesion and jamming due to magnetic field. A portion of the high-pressure liquid is drawn from the cooling lubricant outlet 2-1 at the pump body outlet, and passes through the pre-filter 1-2 and fine filter (with built-in strong magnet) of the external circulation filtration cooling circuit 1 to adsorb and filter out magnetic particles in the liquid, ensuring that the liquid entering the lubrication isolation chamber 7 is a clean lubricant. The filtered liquid flows through the air-cooled cooler 1-4, and the temperature is reduced by the jacketed heat dissipation structure, forming a low-temperature lubricant that enters the lubrication isolation chamber 7 to cool the inner magnetic rotor 8 and the inner drive shaft 4. After the lubricating fluid is cooled in the lubrication isolation chamber 7, it flows back to the pump body 2 through the gap of the spiral return groove 4-1 between the inner drive shaft 4 and the inner drive shaft sleeve 5, taking advantage of the pressure difference between the pump body outlet and inlet. The remaining lubricating fluid returns safely to the pump body inlet 2-2 through the lubricating coolant return interface 7-2 and the check valve 12-2 of the return pipeline 12, forming a closed loop.

[0040] The distance of over 50mm between the pump body isolation plate 6 and the lubrication isolation chamber 7 effectively blocks the heat conduction of ultra-high temperature liquid (e.g., >400℃) inside the pump body to the internal magnetic rotor 8. Combined with the cooling effect of the external circulation cooler, this ensures that the operating temperature of the internal magnetic rotor remains within the temperature resistance range of the magnets. The isolation distance between the internal magnetic rotor 8 and the pump body 2, along with the shielding effect of the pump body isolation plate 6, weakens the magnetic field strength in the impeller 3 region inside the pump body, preventing magnetic particles from being adsorbed onto the impeller or the inner wall of the pump cavity due to the magnetic field, thus ensuring smooth fluid delivery. Through the independent lubrication isolation chamber 7 and the external circulation filter, liquids containing a large number of particles (including magnetic particles) are allowed to pass directly through the pump body without the need for a filter in the main pipeline, solving the application bottleneck caused by the particle filtration limitation of traditional magnetic pumps. The efficient cooling of the external circulation cooling circuit 1 and the heat insulation effect of the isolation structure overcome the temperature resistance limitation of the internal magnetic rotor, supporting the delivery of high-temperature liquids exceeding 400℃. At the same time, the non-contact sealing design meets high-pressure conditions. The spiral reflux groove 4-1 increases the flow rate of lubricating fluid and enhances the lubrication and cooling of the internal drive shaft 4; the check valve 12-2 of the reflux pipeline 12 prevents liquid backflow, and the shut-off valve 12-1 facilitates maintenance and ensures long-term reliable operation of the system.

[0041] This invention isolates the internal magnetic rotor from the liquid containing particles through a pump body isolation plate and a lubrication isolation chamber. Combined with strong magnetic filtration and air cooling in an external circulation filtration and cooling circuit, it enables the direct transport of liquids containing a large number of particles (including magnetic particles) without filtration, avoiding particle adsorption and blockage. The spiral reflux groove enhances lubrication and cooling efficiency, and the heat insulation design with an isolation gap of over 50mm breaks through the temperature resistance limitations of traditional magnetic pumps, enabling stable transport of ultra-high temperature and high pressure liquids. At the same time, the magnetic field weakening structure prevents particles from accumulating inside the pump, and the contactless transmission reduces mechanical losses, significantly improving the reliability and service life of the equipment under harsh operating conditions, reducing maintenance costs, and broadening the application scenarios of magnetic pumps in chemical, energy and other fields.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-temperature magnetic pump for conveying a mixture of particles, characterized in that, The pump includes an external circulating filter cooling circuit (1), a pump body (2), an impeller (3), an internal drive shaft (4), an internal drive shaft sleeve (5), a pump body isolation plate (6), a lubrication isolation cavity (7), an internal magnetic rotor (8), an isolation sleeve (9), an external magnetic rotor (10), and an external drive shaft (11) connected to the internal drive shaft (4). The external drive shaft (11) drives the external magnetic rotor (10) to rotate, thereby driving the internal magnetic rotor (8) to move. The internal magnetic rotor (8) drives the impeller (3) inside the pump body (2) to rotate through the internal drive shaft (4). The internal magnetic rotor (8) is isolated from the pump body (2) and the impeller (3) through the lubrication isolation cavity (7) and the pump body isolation plate (6); The pump body (2) is provided with a cooling lubricant outlet (2-1), and the cooling lubricant outlet (2-1) is connected to the inlet (7-1) of the lubrication isolation chamber (7) through the external circulation filter cooling circuit (1); The inner drive shaft (4) and the inner drive shaft sleeve (5) adopt a connection structure with a gap of return groove (4-1). A small amount of lubricating fluid can flow back to the pump body (2) through the gap of the return groove (4-1) through the lubrication isolation cavity (7). The lubrication isolation chamber (7) is provided with a lubricating coolant return port (7-2), which is connected to the inlet (2-2) of the pump body (2) through a return pipe (12).

2. The high-temperature magnetic pump for conveying particulate mixtures according to claim 1, characterized in that, The external circulation cooling circuit (1) includes a filter and a cooler (1-4). The filter is a magnetic filter with a built-in strong magnet, and the cooler (1-4) is an air-cooled cooler. The external circulation cooling circuit (1) is equipped with a front shut-off valve (1-1) and a rear shut-off valve (1-5).

3. The high-temperature magnetic pump for conveying particulate mixtures according to claim 1, characterized in that, The reflux groove (4-1) between the inner drive shaft (4) and the inner drive shaft sleeve (5) has a spiral structure to increase the flow rate of the circulating reflux fluid and enhance the lubrication and cooling effect on the inner drive shaft (4) and the inner drive shaft sleeve (5).

4. A high-temperature magnetic pump for conveying particulate mixtures according to claim 1, characterized in that, The pump body isolation plate (6) and the lubrication isolation cavity (7) are disposed between the pump body (2), the impeller (3) and the inner magnetic rotor (8). The distance between the pump body (2) and the inner magnetic rotor (8) is greater than 50mm, so as to isolate high temperature and reduce the influence of magnetic field on the particles inside the pump body.

5. A high-temperature magnetic pump for conveying particulate mixtures according to claim 1, characterized in that, The return pipeline (12) includes a connecting pipeline, a shut-off valve (12-1) and a check valve (12-2). The shut-off valve (12-1) is used to control the return flow of the lubricating coolant, and the check valve (12-2) is used to prevent liquid backflow.

6. A high-temperature magnetic pump for conveying particulate mixtures according to claim 2, characterized in that, The filter is a filter group consisting of a pre-filter (1-2) and a fine filter (1-3). Both the pre-filter (1-2) and the fine filter (1-3) have built-in strong magnets to adsorb magnetic particles in the liquid.

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