Vertical methanol pump for conveying methanol

Abstract

The utility model provides a vertical methanol pump for conveying methanol, which comprises a base, a pump body and a pump shaft, a first intermediate is arranged in a first barrel close to the base, a second barrel close to a pump top cover is arranged, and a second intermediate is arranged in the second barrel. And a runner switching mechanism is arranged between the first middle body and the second middle body. By additionally arranging the flow channel switching mechanism, when in use, the flow direction is switched through the flow channel switching mechanism, so that a liquid medium sequentially flows through the first impeller, the second impeller, the fourth impeller and the third impeller, and the pressure directions of the upper two stages are transposed and counteract the inlet pressure, so that the axial force is more balanced; and the pressure borne by the wear-resistant part is greatly reduced, so that the service life of the whole pump is greatly prolonged, and the pump is more suitable for long-time navigation in the shipping industry and is not easy to maintain at any time.

Description

Technical Field

[0001] This utility model belongs to the technical field of vertical methanol pumps, and specifically relates to a vertical methanol pump for transporting methanol. Background Technology

[0002] The shipping industry handles 90% of global trade transport, primarily using marine diesel fuel with a carbon content of 87% and heavy fuel oil with a carbon content of 85%. The International Maritime Organization (IMO) mandates a 70% reduction in CO2 emissions per unit of international shipping volume by 2050 compared to 2008 levels. The Operating Carbon Intensity Index (CII) officially came into effect on January 1, 2023. Faced with the urgent need for clean energy, methanol fuel has attracted significant attention due to its 25% reduction in CO2 emissions per kilogram compared to diesel.

[0003] The methanol pump is a new type of pump that uses the magnetic force of magnets to achieve contactless torque transmission. That is, when the motor drives the outer rotor (outer magnet) assembly to rotate, the magnetic field lines pass through the isolation sleeve, causing the inner rotor (inner magnet) assembly and impeller to rotate synchronously.

[0004] Because methanol solution is corrosive, during operation, the liquid needs to flow through four sets of impellers sequentially, and the pressure increases sequentially from the first to the fourth set of impellers, causing an imbalance in the axial force of the entire pump. Currently, in methanol / diesel dual-power systems in the marine market, the operating conditions for methanol pumps reach 16 Bar. Under these extremely high pressure conditions, the unbalanced axial force will increase the wear and tear on wear-resistant parts, affecting the pump's lifespan and even causing methanol leakage, posing a potential safety hazard to maritime navigation.

[0005] Therefore, how to solve the defects in the above technical solutions has become one of the urgent problems to be solved in the field of vertical methanol pump technology. Utility Model Content

[0006] In view of the problems existing in the background art, the present invention provides a vertical methanol pump for conveying methanol, comprising:

[0007] Base

[0008] and the pump body mounted on the base;

[0009] A pump shaft is disposed within the pump body, and the pump shaft is driven by a motor;

[0010] It also includes a pump top cover, one end of which is mounted on the motor mount of the motor;

[0011] The pump shaft near the motor is connected to the thrust disc via an upper thrust disc bushing.

[0012] An inner magnetic steel assembly is installed on the pump shaft near the upper thrust disc shaft sleeve through a second flat key and is fixed through a first hexagonal nut,

[0013] An isolation sleeve is arranged on one side of the inner magnetic steel assembly,

[0014] The isolation sleeve is fixed on the pump top cover through bolts,

[0015] An outer magnetic rotor assembly is installed on the motor drive shaft through a plurality of screws on one side of the isolation sleeve;

[0016] A first intermediate body is arranged in the first cylinder near the base position,

[0017] A second cylinder is arranged near the pump top cover, and a second intermediate body is arranged in the second cylinder,

[0018] A flow channel conversion mechanism is arranged between the first intermediate body and the second intermediate body.

[0019] Optionally, a stop washer is arranged between the second flat key and the first hexagonal nut.

[0020] Optionally, the first cylinder is connected to the base away from the motor through a first bolt, is positionally fixed through a first hexagonal nut, and a first O-ring is arranged between the first bolt and the first hexagonal nut.

[0021] A cover nut is installed on the pump shaft near the base position, and a stop washer is arranged between the pump shaft and the cover nut.

[0022] Optionally, a guide vane shaft sleeve is installed on the pump shaft in the first intermediate body,

[0023] A first impeller is connected through the guide vane shaft sleeve,

[0024] At least one set of first guide vanes is arranged on the first impeller.

[0025] A guide vane wear ring is arranged on one side of the guide vane shaft sleeve.

[0026] Optionally, the second cylinder and the pump top cover are connected through a fastening bolt,

[0027] The other end of the second cylinder is connected to the first cylinder through a second bolt,

[0028] and is fixedly connected through a second hexagonal nut,

[0029] A second spring washer is arranged between the second bolt and the second hexagonal nut.

[0030] Optionally, one end of the second intermediate body is connected with an impeller cover,

[0031] A guide vane shaft sleeve is arranged on the pump shaft in the second intermediate body,

[0032] and a fourth impeller is connected through the guide vane shaft sleeve, and at least one set of fourth guide vanes is arranged on the fourth impeller.

[0033] Optionally, the flow channel switching mechanism arranged at one side of the second intermediate body is installed on a bearing shaft sleeve arranged on the pump shaft through a first flat key,

[0034] and one end of the flow channel switching mechanism is connected with the first intermediate body,

[0035] and the other end of the flow channel switching mechanism is connected with the second intermediate body.

[0036] A guide vane shaft sleeve is arranged on the pump shaft in the flow channel switching mechanism,

[0037] and a second impeller is connected through the guide vane shaft sleeve,

[0038] and at least one set of second guide vanes is arranged on the second impeller.

[0039] Optionally, a guide vane shaft sleeve is arranged on the pump shaft between the flow channel switching mechanism and the second intermediate body,

[0040] and a third impeller is connected through the guide vane shaft sleeve,

[0041] at least one set of third guide vanes is arranged on the third impeller,

[0042] the first impeller, the second impeller, the third impeller and the fourth impeller are symmetrically arranged through the pump shaft.

[0043] Optionally, a liquid inlet for inputting liquid and a pressure medium inlet are arranged on the first intermediate body,

[0044] liquid medium is inputted through the liquid inlet, then flows through the first intermediate body in Y direction, enters the flow channel switching mechanism, and the flow direction is switched through the flow channel switching mechanism, so that the liquid medium enters the second intermediate body, and flows out through the liquid outlet arranged on the second intermediate body.

[0045] pressure medium is inputted through the pressure medium inlet arranged on the first intermediate body, then flows through the first intermediate body in X direction, enters the flow channel switching mechanism, and the flow direction is switched through the flow channel switching mechanism, so that the pressure medium enters the second intermediate body, and flows out through the pressure medium outlet arranged on the second intermediate body.

[0046] Optionally, the flow channel conversion mechanism is internally provided with a first flow cavity and a second flow cavity.

[0047] In summary, the beneficial effects of the present application are:

[0048] The present application achieves perfect balance of axial force by arranging multiple impellers on the pump shaft symmetrically, ensuring the pump to work durably and stably in complex marine environment. By additionally arranging the flow channel conversion mechanism, the flow direction is converted by the flow channel conversion mechanism during use, so that the liquid medium flows through the first impeller, the second impeller, the fourth impeller and the third impeller in sequence, the pressure direction of the upper two stages is transposed, and the inlet pressure is offset, so that the axial force is more balanced, the pressure borne by the wear-resistant part is greatly reduced, the service life of the whole pump is greatly increased, and the pump is more suitable for long-time marine navigation in the shipping industry and is not easy to maintain at any time. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 It is an embodiment of the vertical methanol pump for conveying methanol according to the present application.

[0050] Figure 2 It is a flow and pressure vector change diagram of the flow channel conversion mechanism (opposite arrangement of impellers) adopted by the embodiment of the vertical methanol pump for conveying methanol according to the present application.

[0051] Figure 3 It is a sectional view of the flow channel conversion mechanism of the embodiment of the vertical methanol pump for conveying methanol according to the present application.

[0052] Figure 4 It is a flow and pressure vector change diagram of the conventional methanol pump without flow channel conversion mechanism (forward arrangement of impellers).

[0053] REFERENCE NUMERALS:

[0054] 1, base; 2, first impeller; 3, first guide vane; 4, first intermediate body; 5, first cylinder; 6, second guide vane; 7, flow channel switching mechanism; 071, first flow cavity; 072, second flow cavity; 8, first flat key; 9, third guide vane; 10, second intermediate body; 11, second cylinder; 12, fourth guide vane; 13, fourth impeller; 14, flat washer; 15, hexagonal bolt; 16, first spring washer; 17, pump top cover; 18, isolation sleeve; 19, outer magnetic rotor assembly; 20, screw; 21, motor; 22, first hexagonal nut; 23, stop washer; 24, second flat key; 25, inner magnetic steel assembly; 26, thrust disc; 27, screw; 28, guide bearing; 29, pump shaft; 30, impeller cover; 31, second bolt; 32, second spring washer; 33, second hexagonal nut; 34, second O-ring; 35, first bolt; 36, first O-ring; 37, guide vane wear ring; 38, guide vane shaft sleeve; 39, wear ring; 40, stop washer; 41, cover nut; 42, lower thrust disc shaft sleeve; 43, bearing shaft sleeve; 44, third flat key; 45, water passing shaft sleeve; 46, upper thrust disc shaft sleeve; 47, threaded connection pipe; 48, liquid inlet; 49, pressure medium inlet. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will make further detailed description to the utility model combining with the drawings and specific embodiments. Although the example embodiments are disclosed in the drawings, it should be understood that the utility model can be realized in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make it easier to understand the utility model thoroughly and to convey the concept of the utility model to the skilled in the art.

[0056] In the description of the present application, the description of the terms "some embodiments", "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0057] In the utility model, the terms "first", "second", "third" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0058] As shown in Figures 1-4 The utility model provides a vertical methanol pump for conveying methanol, which comprises a base 1, and a pump body is mounted on the base;

[0059] A pump shaft 29 is arranged in the pump body, and the pump shaft 29 is driven by a motor 21;

[0060] One end of a pump top cover 17 is mounted on a motor base of the motor 21 through a fastening bolt;

[0061] A guide bearing 28 is arranged on the pump shaft 29 close to the pump top cover 17, and is fixed through a screw 27;

[0062] The pump shaft 29 close to the motor 21 position is connected with a thrust disc 26 through an upper thrust disc shaft sleeve 46, a lower thrust disc shaft sleeve 42 is mounted on the pump shaft 29 away from the motor position, an inner magnetic steel assembly 25 is mounted on the pump shaft 29 close to the upper thrust disc shaft sleeve 46 through a second flat key 24, and is fixed through a first hexagon nut 22, a stop washer 23 is arranged between the second flat key 29 and the first hexagon nut 22; the stop washer increases the friction force; and the two sets of thrust discs (the upper thrust disc shaft sleeve and the lower thrust disc shaft sleeve) and the mating surface of the pump shaft have a gap of 0.5mm.

[0063] Further, an isolation sleeve 18 is arranged on one side of the inner magnetic steel assembly 25, the isolation sleeve 18 is fixed on the pump top cover 17 through a bolt, an outer magnetic rotor assembly 19 is arranged on one side of the isolation sleeve 18, and the isolation sleeve is used for sealing, that is, liquid flows to the inner magnetic steel assembly at most, and is sealed in the pump by the isolation sleeve, the outer magnetic rotor assembly cannot contact the liquid, and the risk of liquid leakage is reduced.

[0064] The outer magnetic rotor assembly 19 is mounted on the driving shaft close to the motor 21 through a plurality of screws 20, and is driven by the motor.

[0065] In this embodiment, the motor 21 is rotated to drive the outer magnetic rotor assembly to rotate, the outer magnetic rotor assembly drives the inner magnetic steel assembly to rotate, the inner magnetic steel assembly drives the pump shaft to rotate, and the impeller (four sets of impellers) on the pump shaft is driven to rotate.

[0066] Further, the first cylinder 5 is connected to the base 1 by a first bolt 35 and fixed in position by a first hexagonal nut, and a first O-ring is arranged between the first bolt and the first hexagonal nut.

[0067] Further, a cover nut 41 is installed on the pump shaft 29 near the base 1, and a stop washer 40 is arranged between the pump shaft 29 and the cover nut.

[0068] In actual application, the liquid needs to flow through the four sets of impellers in sequence, and the pressure is also added in sequence from the first set of impellers to the fourth set of impellers, which will cause the entire pump shaft to be unbalanced. In the current methanol / diesel dual-power system in the ship market, the working condition of the methanol pump reaches 16Bar, and under this extremely high pressure working condition, the unbalanced axial force will increase the wear of the wear-resistant parts and affect the service life of the pump. In order to solve the above technical problems, please refer to Figures 1-4 As shown, a first intermediate body 4 is arranged in the first cylinder 5 near the base 1, a guide vane shaft sleeve 38 is installed on the pump shaft 29 in the first intermediate body 4, the first cylinder 2 is connected through the guide vane shaft sleeve 38, and at least one set of first guide vanes 3 is arranged on the first cylinder 2;

[0069] A guide vane wear-resistant ring 37 is arranged on one side of the guide vane shaft sleeve 38, which can effectively protect the guide vane shaft sleeve from wear caused by the movement of the fluid medium.

[0070] Further, a second cylinder 11 is arranged near the pump top cover 17, the second cylinder 11 and the pump top cover 17 are connected by a fastening bolt, the other end of the second cylinder 11 is connected to the first cylinder 5 by a second bolt 31, and is fixedly connected by a second hexagonal nut 33, and a second spring washer is arranged between the second bolt 31 and the second hexagonal nut 33.

[0071] Further, a second intermediate body 10 is arranged in the second cylinder 5 away from the base 1, one end of the second intermediate body is connected to the impeller cover 30, a guide vane shaft sleeve is installed on the pump shaft 29 in the second intermediate body 10, and the fourth impeller 13 is connected through the guide vane shaft sleeve, and at least one set of fourth guide vanes 12 is arranged on the fourth impeller 13.

[0072] Further, a flow channel conversion mechanism 7 is arranged between the first intermediate body 4 and the second intermediate body 10, the flow channel conversion mechanism 7 is installed on a bearing sleeve 43 arranged on the pump shaft 29 through a first flat key 8,

[0073] and one end of the flow channel conversion mechanism 7 is connected with the first intermediate body 4, and the other end of the flow channel conversion mechanism 7 is connected with the second intermediate body.

[0074] Further, a guide vane sleeve is installed on the pump shaft 29 in the flow channel conversion mechanism 7, and a second impeller is connected through the guide vane sleeve, and at least one set of second guide vanes 6 is arranged on the second impeller.

[0075] Further, a guide vane sleeve is installed on the pump shaft 29 between the second intermediate body 10 and the flow channel conversion mechanism 7, and a third impeller is connected through the guide vane sleeve, and at least one set of third guide vanes 9 is arranged on the third impeller.

[0076] Further, the first impeller, the second impeller, the third impeller and the fourth impeller are symmetrically arranged through the pump shaft.

[0077] Further, a liquid inlet 48 for inputting liquid and a pressure medium inlet 49 are arranged on the first intermediate body,

[0078] The liquid medium is input through the liquid inlet 48, then sequentially flows through the first intermediate body 4 in the Y direction, enters the flow channel conversion mechanism 7, and the flow direction is converted through the flow channel conversion mechanism 7, so that the liquid enters the second intermediate body 10, and flows out through the liquid outlet arranged on the second intermediate body 10;

[0079] The pressure medium is input through the pressure medium inlet 49 arranged on the first intermediate body 4, then flows through the first intermediate body in the x direction, enters the flow channel conversion mechanism 7, and the flow direction is converted through the flow channel conversion mechanism, so that the pressure medium enters the second intermediate body, and flows out through the pressure medium outlet arranged on the second intermediate body.

[0080] The liquid needs to sequentially flow through the four sets of impellers, and the pressure is sequentially superimposed from the first set of impellers to the fourth set of impellers, which will cause the whole pump shaft axial force to be unbalanced. At present, in the methanol / diesel dual power system in the ship market, the working condition of the methanol pump reaches 16Bar, and under this extremely high pressure working condition, the unbalanced axial force will increase the wear of the wear-resistant parts, affecting the service life of the pump. In the embodiment, the flow channel conversion mechanism is additionally arranged, the multi-stage impellers are symmetrically arranged on the pump shaft, the perfect balance of the axial force is achieved, and the persistent and stable operation performance of the pump in the complex marine environment is ensured.

[0081] As Figure 2As shown, when the liquid flows by the impeller 1243 (in turn, the first impeller, the second impeller, the fourth impeller and the third impeller), the pressure direction of the upper two stages is transposed, and the inlet pressure is offset, so that the axial force is more balanced, the pressure borne by the wear-resistant piece is greatly reduced, the life of the whole pump is greatly increased, and the pump is more suitable for long-time navigation in the shipping industry and is not easy to maintain at any time.

[0082] Further, as Figure 3 The flow channel conversion mechanism 3 is internally provided with a first flow cavity 071 and a second flow cavity. In this embodiment, by providing the first flow cavity and the second flow cavity and the inner cavity in the flow channel conversion mechanism, when the flow medium changes the flow direction through the flow channel conversion mechanism 3, the flow between 90° is avoided, the flow loss is smaller, and the space of the first flow cavity and the second flow cavity and the inner cavity in the flow channel conversion mechanism can be fully utilized, only the height is increased, and the overall structure is small.

[0083] But the main shaft is fixed by two thrust discs numbered 26 up and down, and there is a gap of 0.5mm between the thrust disc and the matching surface, that is, the main shaft can move up and down a little, not completely fixed.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A vertical methanol pump for delivering methanol, characterized by, It comprises: a first impeller, a base, and a pump body arranged on the base; a pump shaft arranged in the pump body and driven by a motor; it further comprises a pump top cover, one end of which is mounted on the motor base of the motor; the pump shaft near the motor position is connected to the thrust disc through the upper thrust disc shaft sleeve, the pump shaft near the upper thrust disc shaft sleeve is installed with an inner magnetic steel assembly through the second flat key, and is fixed through the first hexagonal nut, an isolation sleeve is arranged on one side of the inner magnetic steel assembly, the isolation sleeve is fixed on the pump top cover through bolts, the outer magnetic rotor assembly on one side of the isolation sleeve is installed on the motor drive shaft through a plurality of screws; a first intermediate body is arranged in the first cylinder body near the base, a second cylinder body is arranged near the pump top cover, and a second intermediate body is arranged in the second cylinder body, a flow channel conversion mechanism is arranged between the first intermediate body and the second intermediate body.

2. The vertical methanol pump for conveying methanol according to claim 1, wherein a stop washer is arranged between the second flat key and the first hexagonal nut.

3. The vertical methanol pump for conveying methanol according to claim 1, wherein the first cylinder body is connected to the base away from the motor through the first bolt, is positionally fixed through the first hexagonal nut, and a first O-ring is arranged between the first bolt and the first hexagonal nut; a cover nut is installed on the pump shaft near the base, and a stop washer is arranged between the pump shaft and the cover nut.

4. The vertical methanol pump for conveying methanol according to claim 1, wherein a guide vane shaft sleeve is installed on the pump shaft in the first intermediate body, a first impeller is connected through the guide vane shaft sleeve, at least one set of first guide vanes is arranged on the first impeller; a guide vane wear ring is arranged on one side of the guide vane shaft sleeve.

5. The vertical methanol pump for conveying methanol according to claim 1, wherein the second cylinder body and the pump top cover are connected through the fastening bolt, the other end of the second cylinder body is connected to the first cylinder body through the second bolt, and is fixedly connected through the second hexagonal nut, a second spring washer is arranged between the second bolt and the second hexagonal nut.

6. The vertical methanol pump for conveying methanol according to claim 1, wherein one end of the second intermediate body is connected to an impeller cover, a guide vane shaft sleeve is installed on the pump shaft in the second intermediate body, and a fourth impeller is connected through the guide vane shaft sleeve, and at least one set of fourth guide vanes is arranged on the fourth impeller.

7. The vertical methanol pump for conveying methanol according to claim 6, wherein the flow channel conversion mechanism on one side of the second intermediate body is installed on the bearing shaft sleeve arranged on the pump shaft through the first flat key, one end of the flow channel conversion mechanism is connected to the first intermediate body, the other end of the flow channel conversion mechanism is connected to the second intermediate body; a guide vane shaft sleeve is installed on the pump shaft in the flow channel conversion mechanism, and a second impeller is connected through the guide vane shaft sleeve, And at least one set of second guide vanes are arranged on the second impeller.

8. The vertical methanol pump for conveying methanol according to claim 7, wherein, A guide vane sleeve is arranged on the pump shaft between the flow channel conversion mechanism and the second intermediate body, And a third impeller is connected through the guide vane sleeve, At least one set of third guide vanes are arranged on the third impeller, The first, second, third and fourth impellers are symmetrically arranged through the pump shaft.

9. The vertical methanol pump for conveying methanol according to claim 1, wherein, A liquid inlet and a pressure medium inlet are arranged on the first intermediate body for liquid input, Liquid medium is input through the liquid inlet, then flows through the first intermediate body along the Y direction, enters the flow channel conversion mechanism, and the flow direction is converted through the flow channel conversion mechanism, so that the liquid medium enters the second intermediate body, and flows out through the liquid outlet arranged on the second intermediate body; Pressure medium is input through the pressure medium inlet arranged on the first intermediate body, then flows through the first intermediate body along the X direction, enters the flow channel conversion mechanism, and the flow direction is converted through the flow channel conversion mechanism, so that the pressure medium enters the second intermediate body, and flows out through the pressure medium outlet arranged on the second intermediate body.

10. The vertical methanol pump for conveying methanol according to claim 8, wherein, First and second flow cavities are arranged inside the flow channel conversion mechanism.

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