A vertical magnetic slurry pump

Abstract

The present invention relates to the technical field of slurry pumps, and in particular to a vertical magnetic slurry pump, the vertical magnetic slurry pump comprising a pump body and a lubricating oil circulation unit, the pump body comprising an upper connecting sleeve, a middle connecting sleeve and a pump casing connected in sequence, an isolating sleeve is arranged in the upper connecting sleeve, a first cavity is formed between the upper connecting sleeve and the isolating sleeve, an outer magnetic sleeve is arranged in the first cavity, a connecting rotor is arranged at the top of the outer magnetic sleeve, a sealing sleeve is arranged at the bottom of the upper connecting sleeve, a first sealing member is arranged on the sealing sleeve, a second cavity is formed between the isolating sleeve, the upper connecting sleeve and the sealing sleeve, an inner magnetic steel is arranged in the second cavity, a solid magnetic steel is arranged at the bottom of the inner magnetic steel A pump shaft is fixed, the pump shaft extends into the pump housing, an impeller is fixed at the bottom of the pump shaft, an upper bearing and a lower bearing are sleeved on the outside of the pump shaft located in the second cavity, an upper compartment is formed between the upper bearing and the isolation sleeve, a lower compartment is formed between the lower bearing and the sealing sleeve, and a second seal is sleeved on the outside of the pump shaft located in the middle sleeve; the lubricating oil circulation unit includes a lubricating oil circulation pump and a lubricating oil tank, the outlet of the lubricating oil circulation pump is connected to the upper compartment through a pipeline, the inlet of the lubricating oil circulation pump is connected to the outlet of the lubricating oil tank through a pipeline, and the inlet of the lubricating oil tank is connected to the lower compartment through a pipeline. The device has good sealing and lubricating effects.

Description

Technical Field

[0001] The invention relates to the technical field of slurry pumps, and in particular to a vertical magnetic slurry pump. Background Art

[0002] In many industrial fields, such as mining, metallurgy, and chemical industry, the transportation of slurry is a common and critical operation. Traditional slurry pumps have many problems in operation. For example, poor sealing performance can easily lead to material leakage, which not only causes material loss but also may pollute the environment; unsatisfactory lubrication effect affects the service life and operation stability of the pump; and when handling slurry containing solid particles, it is easy to suffer from severe wear and tear. Therefore, an improved slurry pump is needed to overcome these problems. Summary of the invention

[0003] The purpose of the present invention is to solve the problems described in the above background technology. A vertical magnetic slurry pump is proposed herein. The vertical magnetic slurry pump has good sealing performance, lubrication effect and durability.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a vertical magnetic slurry pump, the vertical magnetic slurry pump comprises a pump body and a lubricating oil circulation unit, the pump body comprises an upper connecting sleeve, a middle connecting sleeve and a pump casing connected in sequence,

[0005] The upper connecting sleeve is provided with an isolating sleeve, a first cavity is formed between the upper connecting sleeve and the isolating sleeve, an outer magnetic sleeve is provided in the first cavity, and a connecting rotor is provided on the top of the outer magnetic sleeve.

[0006] A sealing sleeve is provided at the bottom of the upper connecting sleeve, a first sealing member is provided on the sealing sleeve, a second cavity is formed between the isolation sleeve, the upper connecting sleeve and the sealing sleeve, and an inner magnetic steel is provided in the second cavity.

[0007] A pump shaft is fixed to the bottom of the inner magnetic steel, the pump shaft extends into the pump housing, an impeller is fixed to the bottom of the pump shaft, an upper bearing and a lower bearing are sleeved on the outside of the pump shaft located in the second cavity, an upper compartment is formed between the upper bearing and the isolation sleeve, a lower compartment is formed between the lower bearing and the sealing sleeve, and a second sealing member is sleeved on the outside of the pump shaft located in the middle sleeve;

[0008] The lubricating oil circulation unit includes a lubricating oil circulation pump and a lubricating oil tank. The outlet of the lubricating oil circulation pump is connected to the upper compartment through a pipeline, the inlet of the lubricating oil circulation pump is connected to the outlet of the lubricating oil tank through a pipeline, and the inlet of the lubricating oil tank is connected to the lower compartment through a pipeline.

[0009] In the above technical solution, the upper bearing and the lower bearing are immersed in lubricating oil to ensure sufficient lubrication. The lubricating oil is circulated to the upper bearing through an external lubricating oil circulation unit and then flows back to the lubricating oil tank by gravity, forming a forced circulation, which effectively enhances the lubrication effect of the bearing.

[0010] Preferably, the upper bearing adopts a seven-series bearing, and the lower bearing adopts a NU bearing.

[0011] Preferably, the vertical magnetic slurry pump also includes an air supply line, the tail end of which is provided with a first branch and a second branch, the first branch and the second branch are respectively connected to the upper compartment and the middle connecting sleeve, and the air supply line is provided with a pressure reducing valve and a flow meter.

[0012] In the above technical solution, a three-way gas source line design is adopted to balance the pressure of the second cavity and the third cavity, thereby ensuring the stability and directionality of the gas flow.

[0013] Preferably, a one-way valve is provided on the second branch.

[0014] In the above technical solution, the provision of the one-way valve can effectively prevent the material from flowing back into the second cavity.

[0015] Preferably, the lubricating oil level in the lubricating oil tank is higher than the upper bearing.

[0016] Preferably, the lubricating oil tank is provided with an observation window.

[0017] Preferably, a cooling coil is provided in the lubricating oil tank.

[0018] Preferably, the first sealing member is a mechanical seal.

[0019] In the above technical solution, the first seal is installed at the bottom of the lower bearing to isolate the lubricating oil tank, so that the lubricating oil tank can store oil and prevent materials from entering the oil tank to affect the normal operation of the lubricating oil circulation unit.

[0020] Preferably, the second sealing member is a silicon carbide gas seal, and the gap between the second sealing member and the pump shaft is 0.1 mm.

[0021] In the above technical solution, the sealing effect is achieved by throttling the sealing gas through the silicon carbide gas seal.

[0022] Preferably, a third cavity is formed between the sealing sleeve, the intermediate sleeve and the second sealing member, and the air pressure in the third cavity is greater than the air pressure on the back side of the impeller.

[0023] In the above technical solution, it can be ensured that trace gas can enter the pump casing through the gas seal, effectively sealing the material, and the casing detects the gas flow through the flow meter to ensure the sealing effect.

[0024] Preferably, the temperature of the lubricating oil in the lubricating oil tank is 40±1°C.

[0025] Preferably, the impeller comprises an impeller body, an impeller back plate and a shaft body, the impeller body is fixed to one side of the shaft body, the impeller back plate is fixed to the other side of the shaft body, and a plurality of auxiliary blades are provided on the side of the impeller body close to the impeller back plate, and the spacing between the auxiliary blades and the impeller back plate is 0.4-0.6mm. Further preferably, the spacing between the auxiliary blades and the impeller back plate is 0.5mm.

[0026] In the above technical solution, the pressure of the impeller at this location is controlled to be slightly higher than the pressure at the slurry inlet, further preventing the slurry from entering the bearing.

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention effectively prevents materials from flowing back into the bearing and causing damage by cooperating with mechanical seals and silicon carbide gas seals.

[0029] 2. The present invention realizes forced lubrication and cooling of the lubricating oil through the lubricating oil circulation unit, effectively prolongs the service life of the bearing, reduces the failure rate of the equipment, and ensures the stable operation of the pump.

[0030] 3. The present invention balances the pressure of the second cavity and the third cavity through the three-way design of the gas source line, and is equipped with a one-way valve to ensure the stability and directionality of the gas flow, effectively preventing the material from flowing back into the bearing.

[0031] 4. The present invention effectively controls the pressure at the back of the impeller to be slightly higher than the inlet pressure by providing auxiliary blades and controlling the gap between the impeller back plate and the auxiliary blades of the impeller body, thereby further preventing materials from entering the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of the vertical magnetic slurry pump of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the impeller of the present invention;

[0035] Figure 3 It is a schematic diagram of the back structure of the impeller body of the present invention.

[0036] Illustrations: 1. Upper connecting sleeve, 2. Middle connecting sleeve, 3. Pump casing, 4. Isolation sleeve, 5. Outer magnetic sleeve, 6. Connecting rotor, 7. Sealing sleeve, 8. Inner magnetic steel, 9. Pump shaft, 10. Impeller, 11. Upper bearing, 12. Lower bearing, 13. Lubricating oil circulation pump, 14. Lubricating oil tank, 15. First sealing element, 16. Second sealing element, 17. Air supply line, 18. First branch, 19. Second branch, 20. Pressure reducing valve, 21. Flow meter, 22. One-way valve, 101. Impeller body, 102. Impeller back plate, 103. Shaft body, 104. Auxiliary blades. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] The present invention is now further described in conjunction with specific examples. The following examples are only for explaining the present invention, but do not constitute a limitation of the present invention. The test samples and test processes used in the following examples include the following (if the specific experimental conditions are not indicated in the examples, they are usually in accordance with conventional conditions or the conditions recommended by the reagent company; the reagents, consumables, etc. used in the following examples, if not otherwise specified, can all be obtained from commercial channels).

[0040] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] Example 1

[0042] like Figure 1As shown, a vertical magnetic slurry pump is composed of a pump body, a lubricating oil circulation unit and an air supply line 17, wherein the pump body is composed of an upper connecting sleeve 1, a middle connecting sleeve 2 and a pump casing 3 which are connected in sequence, a material inlet is provided at the bottom of the pump casing, a material outlet is provided on the left side of the pump casing, an isolation sleeve 4 is provided in the upper connecting sleeve, a first cavity is formed between the upper connecting sleeve and the isolation sleeve, an outer magnetic sleeve 5 is provided in the first cavity, the outer magnetic sleeve does not contact with the isolation sleeve and the upper connecting sleeve, a connecting rotor 6 is fixed to the top of the outer magnetic sleeve, the connecting rotor extends through the top wall of the upper connecting sleeve and is connected to an external motor.

[0043] A sealing sleeve 7 is provided at the bottom of the upper connecting sleeve, and a first sealing member 15 is provided on the sealing sleeve. A second cavity is formed between the isolation sleeve, the upper connecting sleeve and the sealing sleeve. An inner magnetic steel 8 is provided in the second cavity. The inner magnetic steel is arranged at the top of the second cavity and does not contact the upper connecting sleeve and the isolation sleeve.

[0044] A pump shaft 9 is fixed at the bottom of the inner magnetic steel, and the pump shaft extends into the pump casing. An impeller 10 is fixed at the bottom of the pump shaft. An upper bearing 11 and a lower bearing 12 are sleeved on the outside of the pump shaft located in the second cavity. A lower compartment is formed between the lower bearing and the sealing sleeve, and an upper compartment is formed between the upper bearing and the isolation sleeve. A second seal 16 is sleeved on the outside of the pump shaft located in the middle sleeve.

[0045] The lubricating oil circulation unit consists of a lubricating oil circulation pump 13 and a lubricating oil tank 14. The outlet of the lubricating oil circulation pump is connected to the upper compartment through a pipeline, the inlet of the lubricating oil circulation pump is connected to the outlet of the lubricating oil tank through a pipeline, and the inlet of the lubricating oil tank is connected to the lower compartment through a pipeline.

[0046] A first branch 18 and a second branch 19 are provided at the tail end of the gas source line. The first branch and the second branch are connected to the upper compartment and the middle connecting sleeve respectively. A pressure reducing valve 20 and a flow meter 21 are provided on the gas source line. The gas source line is used to transmit nitrogen or compressed air into the pump body. The flow meter can detect whether there is a small flow of gas passing through the silicon carbide gas seal, and the liquid is sealed to the lower throat bushing to form an effective seal for high-temperature toxic and harmful media.

[0047] In this embodiment, the upper bearing adopts a seven-series bearing, and the lower bearing adopts a NU bearing.

[0048] In this embodiment, the first seal adopts a mechanical seal, including a dynamic ring and a static ring. The static ring is fixedly connected to the sealing sleeve. The setting of the mechanical seal can play a barrier role for the lubricating oil tank, so that the lubricating oil tank can store lubricating oil while preventing materials from entering the lubricating oil tank and affecting the normal operation of the lubrication unit.

[0049] In this embodiment, the second sealing member is a silicon carbide gas seal, and the gap between the silicon carbide gas seal and the pump shaft is controlled to be 0.1 mm.

[0050] In this embodiment, a one-way valve 22 is provided on the second branch to prevent the material from returning along the second branch.

[0051] In this embodiment, the lubricating oil level in the lubricating oil tank is higher than the upper bearing, so that the lubricating oil can immerse the bearing, ensuring that the bearing is always in a good lubricated state. After being transported to the upper bearing by the lubricating oil circulation pump, it can flow back to the lubricating oil tank by its own weight, forming a good circulation.

[0052] In this embodiment, a cooling coil is provided in the lubricating oil tank for cooling the lubricating oil so that the temperature of the lubricating oil is controlled at about 40° C. to prevent the lubricating oil from overheating and damaging the device.

[0053] In this embodiment, the lubricating oil tank is provided with an observation window for observing the liquid level of the lubricating oil to facilitate timely replenishment.

[0054] In this embodiment, a third cavity is formed between the sealing sleeve, the middle sleeve and the second sealing member. The air pressure in the third cavity is greater than the air pressure on the back of the impeller, ensuring that trace gas can enter the pump casing and effectively seal the material. The shell detects the gas flow by observing the flow meter to ensure the sealing effect of the gas seal.

[0055] In this embodiment, if Figure 2 and Figure 3 As shown, the impeller consists of an impeller body 101, an impeller back plate 102 and a shaft body 103. The impeller body is fixed to the right side of the shaft body, the impeller back plate is fixed to the left side of the shaft body, and a plurality of auxiliary blades 104 are radially arranged on the left side of the impeller body at equal intervals along the circumference of the left side of the impeller body. The auxiliary blades are long strips, and the interval between the auxiliary blades and the impeller back plate is controlled to be 0.5 mm.

[0056] Working principle and process of the present invention:

[0057] The present invention drives the connected rotor to rotate through a motor, drives the outer magnetic sleeve to rotate, and under the action of magnetic force, the outer magnetic sleeve drives the inner magnetic steel to rotate, and the inner magnetic steel drives the pump shaft to rotate, thereby driving the impeller to rotate, and the slurry is transported from the material inlet of the pump casing to the material outlet through the impeller.

[0058] The present invention passes nitrogen or compressed air into the second cavity and the third cavity through the first branch and the second branch through the air source line, so that the air pressure in the second cavity and the third cavity is balanced, and the pressure is controllably adjusted through the pressure reducing valve, and the air pressure in the third cavity is controlled to be slightly higher than the air pressure in the pump casing, ensuring that trace gas can enter the pump casing through the air seal, thereby enhancing the sealing effect.

[0059] The present invention inputs lubricating oil into the upper bearing and the upper compartment through a lubricating oil circulation pump, and the lubricating oil naturally flows into the lower bearing and the lower compartment by gravity, and then flows back into the lubricating oil tank. After being cooled by a cooling coil in the oil tank, the lubricating oil re-enters the upper bearing and the upper compartment, forming a circulation, thereby significantly enhancing the lubrication effect of the upper bearing and the lower bearing.

[0060] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0061] The vertical magnetic slurry pump provided by the present invention is introduced in detail above. The principle and implementation mode of the present invention are explained by using specific examples in this article. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A vertical magnetic slurry pump, characterized in that: The vertical magnetic slurry pump comprises a pump body and a lubricating oil circulation unit, wherein the pump body comprises an upper connecting sleeve (1), a middle connecting sleeve (2) and a pump casing (3) which are connected in sequence. An isolation sleeve (4) is provided in the upper connecting sleeve, a first cavity is formed between the upper connecting sleeve and the isolation sleeve, an outer magnetic sleeve (5) is provided in the first cavity, and a connecting rotor (6) is provided on the top of the outer magnetic sleeve. A sealing sleeve (7) is provided at the bottom of the upper connecting sleeve, a first sealing member (15) is provided on the sealing sleeve, a second cavity is formed between the isolation sleeve, the upper connecting sleeve and the sealing sleeve, and an inner magnetic steel (8) is provided in the second cavity. A pump shaft (9) is fixed to the bottom of the inner magnetic steel, the pump shaft extends into the pump housing, an impeller (10) is fixed to the bottom of the pump shaft, an upper bearing (11) and a lower bearing (12) are sleeved on the outside of the pump shaft located in the second cavity, an upper compartment is formed between the upper bearing and the isolation sleeve, a lower compartment is formed between the lower bearing and the sealing sleeve, and a second sealing member (16) is sleeved on the outside of the pump shaft located in the middle sleeve; The lubricating oil circulation unit comprises a lubricating oil circulation pump (13) and a lubricating oil tank (14), wherein the outlet of the lubricating oil circulation pump is connected to the upper compartment via a pipeline, the inlet of the lubricating oil circulation pump is connected to the outlet of the lubricating oil tank via a pipeline, and the inlet of the lubricating oil tank is connected to the lower compartment via a pipeline.

2. The vertical magnetic slurry pump according to claim 1, characterized in that: The vertical magnetic slurry pump also includes an air supply line (17), the tail end of which is provided with a first branch (18) and a second branch (19), the first branch and the second branch being respectively connected to the upper compartment and the middle connecting sleeve, and the air supply line is provided with a pressure reducing valve (20) and a flow meter (21).

3. The vertical magnetic slurry pump according to claim 2, characterized in that: A one-way valve (22) is provided on the second branch line.

4. The vertical magnetic slurry pump according to claim 1, characterized in that: The lubricating oil level in the lubricating oil tank is higher than the upper bearing.

5. The vertical magnetic slurry pump according to claim 1, characterized in that: A cooling coil is arranged in the lubricating oil tank.

6. The vertical magnetic slurry pump according to claim 1, characterized in that: The first sealing member is a mechanical seal.

7. The vertical magnetic slurry pump according to claim 1, characterized in that: The second sealing member is a silicon carbide gas seal, and the gap between the second sealing member and the pump shaft is 0.1 mm.

8. The vertical magnetic slurry pump according to claim 1, characterized in that: A third cavity is formed between the sealing sleeve, the intermediate sleeve and the second sealing member, and the air pressure in the third cavity is greater than the air pressure on the back side of the impeller.

9. The vertical magnetic slurry pump according to claim 1, characterized in that: The temperature of the lubricating oil in the lubricating oil tank is 40±1°C.

10. The vertical magnetic slurry pump according to claim 1, characterized in that: The impeller comprises an impeller body (101), an impeller back plate (102) and a shaft body (103); the impeller body is fixed to one side of the shaft body, the impeller back plate is fixed to the other side of the shaft body, and a plurality of auxiliary blades (104) are provided on one side of the impeller body close to the impeller back plate, wherein the distance between the auxiliary blades and the impeller back plate is 0.4-0.6 mm.

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