Multi-stage magnetic drive pump with thermal compensation function

Abstract

The utility model discloses a multistage magnetic drive pump with a thermal compensation function, which comprises a compensator, and the compensator comprises a pull rod, a pressing sheet, a nut, a disc spring and a sleeve. The rear end of the pull rod penetrates through the pump body and is connected with the outlet section, and the front end of the pull rod sequentially penetrates through the rear end face of the sleeve, the disc spring located in the sleeve and the pressing piece and then is connected with the nut. And the rear end of the sleeve is in contact with the front end of the inlet section. The compensator can play a buffering role during thermal expansion, so that normal operation of all parts is guaranteed, the problem of part abrasion caused by thermal expansion is avoided, meanwhile, the outer magnetic assembly and the inner magnetic assembly are of a split structure, and the compensator has the advantages of being convenient to disassemble and assemble and flexible to adjust.

Description

Technical Field

[0001] The utility model relates to a multi-stage magnetic pump. Background Art

[0002] Multi-stage magnetic drive pumps are widely used in the petroleum, chemical, and other industries for fluid transportation. They feature compact structure, low noise, and stable operation. They typically consist of a pump body, a main shaft, and multiple sets of midsections, guide vanes, and impellers. The main shaft drives the impeller, while the midsection, guide vanes, and impeller work together to generate pressure, moving the fluid from the inlet to the outlet.

[0003] However, existing multi-stage magnetic pumps have the following defects: the middle section, guide vanes, bolts and other components will experience thermal expansion when in contact with high-temperature media. Thermal expansion will cause the gaps between components to become smaller and even cause jamming, affecting the normal operation of the equipment and increasing the wear of the components. Utility Model Content

[0004] The utility model provides a multi-stage magnetic pump with a thermal compensation function, which aims to solve the problem that the existing multi-stage magnetic pump cannot operate normally when thermal expansion occurs, causing component wear.

[0005] The technical solution of this utility model is as follows:

[0006] A multi-stage magnetic pump with thermal compensation comprises a pump body, a main shaft, and a drive shaft. The pump body is provided with multiple sets of middle sections, guide vanes, and impellers, each impeller being mounted on the main shaft. The main shaft is connected to the drive shaft via a magnetic transmission mechanism. The pump body comprises an inlet section, a protective sleeve, and an outlet section. The protective sleeve is located between the inlet section and the outlet section, with one end fixedly connected to the inlet section or the outlet section and the other end slidably connected to the outlet section or the inlet section. The inlet section, each stage of the middle section, and the outlet section are sequentially connected via a stop structure.

[0007] The multi-stage magnetic pump also includes a compensator, which includes a pull rod, a pressure plate, a nut, a disc spring and a sleeve; the rear end of the pull rod passes through the pump body and is connected to the outlet section, and the front end passes through the rear end face of the sleeve, the disc spring located in the sleeve and the pressure plate in sequence and is connected to the nut; the rear end of the sleeve is in contact with the front end of the inlet section.

[0008] As a further improvement of the multi-stage magnetic pump with thermal compensation function: the disc springs are arranged in multiple groups, each group has two or more disc springs, and the disc springs of adjacent groups are installed in opposite directions.

[0009] As a further improvement of the multi-stage magnetic pump with thermal compensation function: a connector is installed at the rear end of the pump body, the drive shaft is installed at the rear end of the connector through a bearing, and the magnetic transmission mechanism is arranged in the connector;

[0010] The magnetic transmission mechanism includes an inner magnetic component connected to the rear end of the main shaft, an outer magnetic component connected to the front end of the drive shaft, and an isolation sleeve connected to the connector, wherein the isolation sleeve is located between the inner magnetic component and the outer magnetic component.

[0011] As a further improvement of the multi-stage magnetic pump with thermal compensation function: the external magnetic assembly includes a plurality of first annular lining irons connected in sequence by a stop structure, adjacent first annular lining irons are connected by bolts, and first magnetic blocks are evenly distributed on the circumference of the inner hole of each first annular lining iron.

[0012] As a further improvement of the multi-stage magnetic pump with thermal compensation function: the first annular liner at the rear end is mounted on the driving wheel by bolts, and the driving wheel is mounted on the front end of the driving shaft.

[0013] As a further improvement of the multi-stage magnetic pump with thermal compensation function: the rear end of the main shaft is fixedly connected with a transmission sleeve;

[0014] The inner magnetic assembly comprises a plurality of second annular lining irons arranged front to back and sleeved on the outside of the transmission sleeve, and second magnetic blocks are evenly distributed on the circumference of the outer wall of each second annular lining iron;

[0015] A first keyway is provided in the inner holes of all the second annular iron liners, a second keyway is provided on the outer wall of the transmission sleeve, a transmission key is installed in the second keyway, and the transmission key matches with all the first keyways.

[0016] As a further improvement of the multi-stage magnetic pump with thermal compensation function: the second annular liner at the front side contacts the shaft shoulder at the front end of the transmission sleeve;

[0017] A fixing sleeve is also installed on the transmission sleeve. The rear end surface of the fixing sleeve is connected to the rear end surface of the transmission sleeve through bolts. The second annular liner and the second magnetic block are located in the sleeve body of the fixing sleeve.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The utility model fixes the pump body and the middle sections of each stage together along the axial direction through the compensator. When the temperature rises and the middle section and other components expand thermally, the inlet section pushes the sleeve forward, the disc spring is compressed and plays a buffering role, thereby ensuring the normal operation of each component and avoiding the problem of component wear caused by thermal expansion.

[0020] 2. Both the outer magnetic assembly and the inner magnetic assembly adopt a split structure, which makes installation and disassembly more convenient. It also realizes the modularization of the components. The number of magnetic blocks can be flexibly adjusted as needed to meet different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 It is the structural diagram of the compensator;

[0023] Figure 3 Schematic diagram of the structure of the external magnetic component;

[0024] Figure 4 is a cross-sectional view of the first annular liner and the first magnetic block;

[0025] Figure 5 Schematic diagram of the structure of the inner magnetic component;

[0026] Figure 6 It is a cross-sectional view of the second annular liner and the second magnetic block. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0028] like Figure 1 , a multi-stage magnetic pump with thermal compensation function, including a pump body, a main shaft 6 and a drive shaft 12.

[0029] The pump body comprises an inlet section 1, a protective tube 15, and an outlet section 7. The protective tube 15 is located between the inlet section 1 and the outlet section 7, with one end fixedly connected to the inlet section 1 or the outlet section 7 by screws and the other end slidingly connected to the outlet section 7 or the inlet section 1. The protective tube 15 is a thin-walled cylindrical structure.

[0030] The pump body is provided with multiple sets of middle sections 3, guide vanes 5 and impellers 4. Each impeller 4 is mounted on a main shaft 6. The inlet section 1, each level of the middle section 3 and the outlet section 7 are connected in sequence through a stop structure.

[0031] The multi-stage magnetic pump further includes a compensator 2. Figure 2 The compensator 2 comprises a tie rod 2-1, a pressure plate 2-2, a nut 2-5, a disc spring 2-3, and a sleeve 2-4. In this embodiment, the disc springs 2-3 are arranged in four groups, each containing eight discs. Adjacent groups of disc springs 2-3 are installed in opposite directions and are all located within the sleeve 2-4. The rear end of the tie rod 2-1 passes through the pump body and connects to the outlet section 7. The front end passes through the rear end of the sleeve 2-4, the disc spring 2-3, and the pressure plate 2-2, before connecting to the nut 2-5. The rear end of the sleeve 2-4 contacts the front end of the inlet section 1.

[0032] When the temperature rises and components such as the middle section 3 expand thermally, the distance between the inlet section 1 and the outlet section 7 increases under the action of the middle section 3, the inlet section 1 pushes the sleeve 2-4 forward, and the disc spring 2-3 is compressed to play a buffering role, thereby ensuring the normal operation of each component and avoiding component wear caused by thermal expansion.

[0033] The main shaft 6 is connected to the drive shaft 12 via a magnetic transmission mechanism. Specifically, a connector 8 is mounted at the rear end of the pump body. This connector 8 comprises a pump cover, an intermediate body, and a housing. The drive shaft 12 is mounted on the rear end (housing) of the connector 8 via bearings, and the magnetic transmission mechanism is located within the connector 8 (intermediate body).

[0034] The magnetic transmission mechanism includes an inner magnetic assembly 10 connected to the rear end of the main shaft 6, an outer magnetic assembly 9 connected to the front end of the drive shaft 12, and an isolation sleeve 11 connected to the connector 8. The isolation sleeve 11 is located between the inner magnetic assembly 10 and the outer magnetic assembly 9 and acts as a seal.

[0035] like Figure 3 and 4 The external magnetic assembly 9 includes a plurality of first annular lining irons 9-1 connected in sequence by a stop structure, and adjacent first annular lining irons 9-1 are connected by bolts. First magnetic blocks 9-2 are evenly distributed on the circumference of the inner hole of each first annular lining iron 9-1, and the first magnetic blocks 9-2 are installed in the countersunk hole.

[0036] Furthermore, the driving wheel 13 is mounted on the front end of the driving shaft 12 by a key, the first annular liner 9-1 at the rear end is mounted on the driving wheel 13 by bolts, and then other first annular liner 9-1 and first magnetic block 9-2 are mounted forward in sequence.

[0037] like Figure 5 and 6 The rear end of the main shaft 6 is fixedly connected with a transmission sleeve 14.

[0038] The inner magnetic assembly 10 includes a plurality of second annular liner irons 10-2 arranged in a front-to-back arrangement and sleeved on the outside of the transmission sleeve 14. The frontmost second annular liner iron 10-2 contacts the shaft shoulder at the front end of the transmission sleeve 14. Second magnetic blocks 10-1 are evenly distributed around the outer wall of each second annular liner iron 10-2.

[0039] A first keyway is provided in the inner hole of all second annular liner irons 10-2, a second keyway is provided on the outer wall of the transmission sleeve 14, a transmission key 10-4 is installed in the second keyway, and the transmission key 10-4 cooperates with all first keyways to realize transmission.

[0040] A fixed sleeve 10-3 is also mounted on the transmission sleeve 14. The rear end of the fixed sleeve 10-3 is bolted to the rear end of the transmission sleeve 14 and contacts the rearmost second annular iron liner 10-2, axially positioning the second annular iron liner 10-2 against the shaft shoulder. The second annular iron liner 10-2 and the second magnetic block 10-1 are located within the body of the fixed sleeve 10-3, with a sealing ring positioned between the front end of the fixed sleeve 10-3 and the shaft shoulder. The fixed sleeve 10-3 prevents the second magnetic block 10-1 from falling out due to centrifugal force.

[0041] During operation, the drive shaft 12 drives the external magnetic assembly 9 to rotate through the drive wheel 13, and the first magnetic block 9-2 and the second magnetic block 10-1 are transmitted through magnetic force. The second magnetic block 10-1 and the second annular liner iron 10-2 drive the transmission sleeve 14 and the main shaft 6 to rotate through the transmission key 10-4.

[0042] The outer magnetic assembly 9 and the inner magnetic assembly 10 adopt a split structure, which is not only convenient for installation and disassembly, but also allows the number of magnetic blocks to be flexibly adjusted according to working conditions.

[0043] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. A multi-stage magnetic pump with thermal compensation function, comprising a pump body, a main shaft (6) and a drive shaft (12), wherein the pump body is provided with a plurality of sets of middle sections (3), guide vanes (5) and impellers (4), each impeller (4) is mounted on the main shaft (6), and the main shaft (6) is connected to the drive shaft (12) through a magnetic transmission mechanism, characterized in that: The pump body comprises an inlet section (1), a protective tube (15) and an outlet section (7); the protective tube (15) is located between the inlet section (1) and the outlet section (7), one end of the protective tube is fixedly connected to the inlet section (1) or the outlet section (7), and the other end is slidably connected to the outlet section (7) or the inlet section (1); the inlet section (1), each level of the middle section (3) and the outlet section (7) are connected in sequence via stop structures; The multi-stage magnetic pump also includes a compensator (2), which includes a pull rod (2-1), a pressing plate (2-2), a nut (2-5), a disc spring (2-3) and a sleeve (2-4); the rear end of the pull rod (2-1) passes through the pump body and is connected to the outlet section (7), and the front end passes through the rear end surface of the sleeve (2-4), the disc spring (2-3) and the pressing plate (2-2) in sequence, and is connected to the nut (2-5); the rear end of the sleeve (2-4) is in contact with the front end of the inlet section (1).

2. The multi-stage magnetic pump with thermal compensation as claimed in claim 1, characterized in that: The disc springs (2-3) are in multiple groups, each group has more than two discs, and adjacent groups of disc springs (2-3) are installed in opposite directions.

3. The multi-stage magnetic pump with thermal compensation as claimed in claim 1, characterized in that: A connecting body (8) is installed at the rear end of the pump body, the driving shaft (12) is installed at the rear end of the connecting body (8) via a bearing, and the magnetic transmission mechanism is arranged in the connecting body (8); The magnetic transmission mechanism comprises an inner magnetic component (10) connected to the rear end of the main shaft (6), an outer magnetic component (9) connected to the front end of the drive shaft (12), and an isolation sleeve (11) connected to the connector (8), wherein the isolation sleeve (11) is located between the inner magnetic component (10) and the outer magnetic component (9).

4. The multi-stage magnetic pump with thermal compensation as claimed in claim 3, characterized in that: The external magnetic assembly (9) comprises a plurality of first annular liner irons (9-1) connected in sequence front to back via stop structures, adjacent first annular liner irons (9-1) being connected via bolts, and first magnetic blocks (9-2) being evenly distributed around the circumference of the inner hole of each first annular liner iron (9-1).

5. The multi-stage magnetic pump with thermal compensation as claimed in claim 4, characterized in that: The first annular liner iron (9-1) at the rear end is mounted on a driving wheel (13) by means of bolts, and the driving wheel (13) is mounted on the front end of the driving shaft (12).

6. The multi-stage magnetic pump with thermal compensation as claimed in claim 3, characterized in that: A transmission sleeve (14) is fixedly connected to the rear end of the main shaft (6); The inner magnetic assembly (10) comprises a plurality of second annular liner irons (10-2) arranged in a front-to-rear manner and sleeved on the outside of the transmission sleeve (14), and second magnetic blocks (10-1) are evenly distributed on the circumference of the outer wall of each second annular liner iron (10-2); A first keyway is provided in the inner holes of all the second annular liner irons (10-2), a second keyway is provided on the outer wall of the transmission sleeve (14), a transmission key (10-4) is installed in the second keyway, and the transmission key (10-4) matches with all the first keyways.

7. The multi-stage magnetic pump with thermal compensation as claimed in claim 6, characterized in that: The second annular liner iron (10-2) at the frontmost side contacts the shaft shoulder at the front end of the transmission sleeve (14); A fixing sleeve (10-3) is also mounted on the transmission sleeve (14); the rear end surface of the fixing sleeve (10-3) is connected to the rear end surface of the transmission sleeve (14) via bolts; and the second annular liner iron (10-2) and the second magnetic block (10-1) are located in the sleeve body of the fixing sleeve (10-3).

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