Vertical multi-stage centrifugal pipeline pump

Abstract

The utility model relates to the technical field of centrifugal pipeline pumps, in particular to a vertical multi-stage centrifugal pipeline pump which comprises a driving motor, a pump body, a mounting cover, a plurality of mounting bolts, a plurality of mounting nuts, a liquid inlet pipe, a liquid outlet pipe and a plurality of sets of impellers, a circulation cavity is formed in the pump body, the multiple sets of impellers are arranged in the pump body, a coupler is coaxially arranged in the mounting cover, and the impeller is arranged in the pump body. The output end of the driving motor is coaxially and fixedly connected with the coupler, the end, away from the driving motor, of the coupler is coaxially and fixedly connected with a rotating shaft, the rotating shaft is coaxially and fixedly connected with the multiple sets of impellers, and a sealing mechanism is arranged at the rotating connecting position of the rotating shaft and the pump body. When fluid in the circulation cavity impacts the movable lantern ring, fluid impact pressure generates closing thrust on the movable lantern ring so that the movable lantern ring and the limiting and fixing lantern ring can be closed, and the risk that the fluid in the pump body leaks outwards through the rotating connection sealing position of the rotating shaft and the pump body is avoided.

Description

Technical Field

[0001] The present application relates to the field of centrifugal pipeline pumps, and in particular to a vertical multi-stage centrifugal pipeline pump. Background Art

[0002] The vertical multi-stage centrifugal pipeline pump adopts a standard vertical motor and a quick-install mechanical seal, which is very convenient to replace. When the pump is working, the motor drives the shaft to rotate, and the liquid filled in the impeller is thrown from the center of the impeller along the flow channel of the blades to the surrounding of the impeller under the action of centrifugal force. Due to the action of the blades, the pressure and speed of the liquid increase at the same time, and it is led to the next level of impeller through the flow channel of the guide housing. The liquid flows through all the impellers and guide housings one by one, further increasing the pressure energy of the liquid. After each impeller is superimposed step by step, a certain head is obtained;

[0003] Referring to the Chinese patent application with the announcement number CN215719531U, a vertical multi-stage pipeline pump is disclosed, wherein a plurality of guide impellers movably sleeved with the impeller shaft are arranged at the bottom of the top sealing kit, a flow channel kit is arranged between two adjacent guide impellers, a connecting casing is fixedly connected to the bottom end of the vertical motor by bolts, an external casing is arranged at the bottom of the connecting casing, and a liquid outlet valve body is arranged at the bottom of the external casing, and the external structure and internal components of the pipeline pump are conveniently disassembled and installed through the flow channel kit and the external casing, thereby improving efficiency;

[0004] However, in the prior art, since the fluid in the vertical multi-stage centrifugal pipeline pump needs to be continuously lifted upward from the bottom, the impeller is also subjected to an upward impact, and the shaft and the bearing tend to move relative to each other in the vertical direction, making it easy for the seal between the shaft and the pump body to loosen, resulting in the risk of fluid leakage in the pump body, which may cause economic losses and waste of resources. For this reason, we designed a vertical multi-stage centrifugal pipeline pump. Utility Model Content

[0005] A vertical multi-stage centrifugal pipeline pump provided in an embodiment of the present application can avoid the technical problem that when the seal between the rotating shaft and the pump body becomes loose, the risk of fluid in the pump body leaking out through the seal where the rotating shaft and the pump body are rotatably connected.

[0006] The embodiment of the present application provides a vertical multi-stage centrifugal pipeline pump including a driving motor, a pump body, a mounting cover, a plurality of mounting bolts, a plurality of mounting nuts, a liquid inlet pipe, a liquid outlet pipe and a plurality of impellers, wherein a circulation cavity is provided in the pump body, a plurality of impellers are arranged in the pump body, a coupling is coaxially provided in the mounting cover, an output end of the driving motor is coaxially fixedly connected with the coupling, an end of the coupling away from the driving motor is coaxially fixedly connected with a rotating shaft, the rotating shaft is coaxially fixedly connected with the plurality of impellers, and a sealing mechanism is provided at a rotating connection between the rotating shaft and the pump body to prevent the rotating connection between the rotating shaft and the pump body from loosening and causing fluid leakage;

[0007] The output end of the driving motor drives the shaft to rotate through the coupling, so that the impeller in the pump body rotates. When the impeller rotates, the force of the rotating impeller on the fluid gives the fluid an impulse in the direction of fluid movement to transfer kinetic energy to achieve fluid transportation. The fluid is guided to the next-level impeller through the flow cavity of the guide shell in the pump body. The liquid flows through all the impellers and guide shells one by one, further increasing the pressure energy of the liquid. After passing the highest point, the fluid is transported downward through the impeller and finally transported to the liquid outlet pipe. When the fluid in the flow cavity impacts the moving ring, the fluid impact pressure generates a closing thrust on the moving ring, which closes the moving ring and the limit fixed ring, avoiding the risk of the fluid in the pump body leaking out through the seal of the rotating connection between the shaft and the pump body.

[0008] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0009] 1. The present application provides a movable ring at one end of the rotating shaft close to the bearing, and a limit fixing ring is provided below the bearing mounting groove of the pump body, and a spring is provided between the limit fixing ring and the movable ring. When the fluid in the circulation cavity impacts the movable ring, the fluid impact pressure generates a closing thrust on the movable ring to close the movable ring and the limit fixing ring, thereby avoiding the risk of the fluid in the pump body leaking outward through the rotating connection seal between the rotating shaft and the pump body.

[0010] 2. In the present application, the impellers in the pump body are assembled in multiple groups to avoid the need to replace all the impellers in the pump body due to damage to one impeller. Compared with the prior art, it is easier to repair and replace the pump body at a later stage.

[0011] In some embodiments, two ends of the mounting cover are fixedly connected to the drive motor and the pump body respectively through a plurality of mounting bolts and a plurality of mounting nuts.

[0012] In some embodiments, the sealing mechanism comprises:

[0013] A movable sleeve, the movable sleeve is coaxially arranged on the outer side wall of the rotating shaft, and a first mounting groove is formed at one end of the movable sleeve close to the driving motor;

[0014] A position-limiting fixing collar, wherein the position-limiting fixing collar is fixedly arranged on the pump body, the rotating shaft is coaxially inserted in the position-limiting fixing collar, and a second mounting groove is formed at one end of the position-limiting fixing collar away from the driving motor corresponding to the first mounting groove;

[0015] A spring, two ends of which are fixedly connected to the inner walls of the first mounting groove and the second mounting groove respectively, and the spring is coaxially sleeved on the outer side of the rotating shaft.

[0016] In some embodiments, a first sealing groove is provided on the movable contact surface between the movable ring and the rotating shaft, a first sealing ring is provided in the sealing groove, a second sealing ring is provided on the contact surface between the limiting fixed ring and the pump body, and a third sealing ring is provided on the contact surface between the limiting fixed ring and the rotating shaft.

[0017] In some embodiments, synthetic rubber pads are provided at the ends of the movable ring and the position-limiting fixed ring that are close to each other.

[0018] In some embodiments, a mounting cylinder is coaxially provided on the outer side of the impeller, and a plurality of the mounting cylinders are assembled and connected in sequence end to end, and a sealing ring is provided on the contact surface between the impeller and the rotating shaft.

[0019] In some embodiments, the liquid inlet pipe and the liquid outlet pipe are both communicated with the flow cavity of the pump body, and flange mounting plates are provided on the liquid inlet pipe and the liquid outlet pipe.

[0020] In some embodiments, a mounting base plate is provided at one end of the pump body away from the driving motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic structural diagram of a vertical multi-stage centrifugal pipeline pump provided in an embodiment of the present application;

[0023] Figure 2 A left-right isometric schematic diagram of a vertical multi-stage centrifugal pipeline pump provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the internal structure of a vertical multi-stage centrifugal pipeline pump provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of a sealing mechanism of a vertical multi-stage centrifugal pipeline pump provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of the internal structure of a vertical multi-stage centrifugal pipeline pump provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the impeller installation structure of a vertical multi-stage centrifugal pipeline pump provided in an embodiment of the present application.

[0028] Among them, the reference numerals in the figure are:

[0029] 1. Driving motor; 2. Pump body; 3. Mounting cover; 4. Mounting bolts; 5. Mounting nuts; 6. Liquid inlet pipe; 7. Liquid outlet pipe; 8. Flange mounting plate; 9. Circulation chamber; 10. Impeller; 11. Mounting base plate; 12. Coupling; 13. Rotating shaft; 14. Moving sleeve; 15. First sealing ring; 16. Limiting and fixing sleeve; 17. Spring; 18. Sealing ring. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application 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 application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] It should be noted that, in the present application, words such as "in the present embodiment", "exemplarily", "for example", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described in the present application as "in the present embodiment", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in the present embodiment", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] The vertical multi-stage centrifugal pipeline pump adopts a standard vertical motor and a quick-install mechanical seal, which is very convenient to replace. When the pump is working, the motor drives the shaft to rotate, and the liquid filled in the impeller is thrown from the center of the impeller along the flow channel of the blades to the surrounding of the impeller under the action of centrifugal force. Due to the action of the blades, the pressure and speed of the liquid increase at the same time, and it is led to the next impeller through the flow channel of the guide casing. The liquid flows through all the impellers and guide casings one by one, further increasing the pressure energy of the liquid. After each impeller is superimposed step by step, a certain head is obtained.

[0038] A vertical multi-stage pipeline pump in the related technology has a plurality of guide impellers movably connected to the impeller shaft column at the bottom of the top sealing kit, a flow channel kit is provided between two adjacent guide impellers, the bottom end of the vertical motor is fixedly connected to a connecting casing by bolts, an external casing is provided at the bottom of the connecting casing, and a liquid outlet valve body is provided at the bottom of the external casing. The flow channel kit and the external casing facilitate the disassembly and installation of the external structure and internal components of the pipeline pump, thereby improving efficiency.

[0039] Based on this, in order to improve the problem in the related technology that the rotating shaft and the bearing will tend to move relative to each other in the vertical direction, which makes the seal between the rotating shaft and the pump body easy to loosen, resulting in the risk of fluid leakage in the pump body, which may cause economic losses and waste of resources, the embodiment of the present application provides the following solution.

[0040] See also Figures 1 to 6 A vertical multistage centrifugal pipeline pump comprises a driving motor 1, a pump body 2, a mounting cover 3, a plurality of mounting bolts 4, a plurality of mounting nuts 5, a liquid inlet pipe 6, a liquid outlet pipe 7 and a plurality of impellers 10. A flow chamber 9 is provided in the pump body 2. The plurality of impellers 10 are arranged in the pump body 2. A rotating shaft 13 is coaxially fixedly connected with the plurality of impellers 10. A sealing mechanism is provided at the rotating connection between the rotating shaft 13 and the pump body 2. The sealing mechanism is used to prevent the rotating connection between the rotating shaft 13 and the pump body 2 from loosening and causing fluid leakage.

[0041] The sealing mechanism includes a movable collar 14, a limit fixing collar 16 and a spring 17. The movable collar 14 is coaxially arranged on the outer side wall of the rotating shaft 13. The end of the movable collar 14 close to the driving motor 1 is provided with a first mounting groove. The limit fixing collar 16 is fixedly arranged on the pump body 2. The rotating shaft 13 is coaxially inserted in the limit fixing collar 16. The end of the limit fixing collar 16 away from the driving motor 1 is provided with a second mounting groove corresponding to the first mounting groove. The two ends of the spring 17 are respectively fixedly connected to the inner walls of the first mounting groove and the second mounting groove, and the spring 17 is coaxially sleeved on the outer side of the rotating shaft 13.

[0042] The effect of this arrangement is that since a spring 17 is provided between the limit fixing ring 16 and the movable ring 14, when the fluid in the circulation chamber 9 impacts the movable ring 14, the fluid impact pressure generates a closing thrust on the movable ring 14 to close the movable ring 14 and the limit fixing ring 16, thereby preventing the risk of the fluid in the pump body 2 leaking outward through the rotating connection seal between the rotating shaft 13 and the pump body 2, thereby avoiding economic losses and waste of resources.

[0043] See also Figure 1 and Figure 2 The two ends of the mounting cover 3 are fixedly connected to the drive motor 1 and the pump body 2 respectively through a plurality of mounting bolts 4 and a plurality of mounting nuts 5. A coupling 12 is coaxially arranged in the mounting cover 3. The output end of the drive motor 1 is coaxially fixedly connected to the coupling 12. The end of the coupling 12 away from the drive motor 1 is coaxially fixedly connected to a rotating shaft 13.

[0044] The effect of such arrangement is that the output end of the driving motor 1 is coaxially fixedly connected with the impeller 10 through the coupling 12, and the impeller 10 is driven to rotate, so that the fluid is lifted and pressurized, which facilitates the transportation of the fluid.

[0045] See also Figure 3 and Figure 4The movable contact surface between the movable sleeve 14 and the rotating shaft 13 is provided with a first sealing groove, in which a first sealing ring 15 is provided, the contact surface between the position-limiting fixed sleeve 16 and the pump body 2 is provided with a second sealing ring, and the contact surface between the position-limiting fixed sleeve 16 and the rotating shaft 13 is provided with a third sealing ring;

[0046] The effect of such an arrangement is to ensure the sealing of the pump body 2 through the arrangement of the sealing ring, thereby providing a normal working environment for the multi-stage centrifugal pipeline pump.

[0047] See also Figure 3 and Figure 4 , the ends of the movable sleeve ring 14 and the position-limiting fixed sleeve ring 16 that are close to each other are both provided with synthetic rubber pads;

[0048] The effect of this arrangement is that a closing thrust is generated on the movable ring 14 through the fluid impact pressure, so that the movable ring 14 and the limiting fixed ring 16 are closed, and synthetic rubber pads are provided at the ends of the movable ring 14 and the limiting fixed ring 16 that are close to each other. The synthetic rubber pads fit tightly under the action of the fluid and have a better sealing effect.

[0049] See also Figure 5 and Figure 6 A mounting cylinder is coaxially arranged outside the impeller 10, and a plurality of mounting cylinders are assembled and connected in sequence end to end. A sealing ring 18 is arranged on the contact surface between the impeller 10 and the rotating shaft 13;

[0050] The effect of such arrangement is that, since the impellers 10 in the pump body 2 are assembled in multiple groups, it is avoided that the impellers 10 in the pump body 2 need to be replaced due to damage to one impeller 10, thereby saving costs.

[0051] See also Figure 1 and Figure 2 The liquid inlet pipe 6 and the liquid outlet pipe 7 are both connected to the flow cavity 9 of the pump body 2, and the liquid inlet pipe 6 and the liquid outlet pipe 7 are both provided with a flange mounting plate 8, and the end of the pump body 2 away from the driving motor 1 is provided with a mounting base plate 11;

[0052] The effect of such a configuration is to facilitate the pump body 2 to be connected with the external connecting pipe through a set of flange mounting plates 8 to realize pipeline transportation of the fluid, and to facilitate the installation of the vertical multi-stage centrifugal pipeline pump through the mounting base plate 11, thereby providing a stable working environment for the vertical multi-stage centrifugal pipeline pump.

[0053] From the above, we can see that the working principle of this application is as follows:

[0054] The output end of the driving motor 1 drives the rotating shaft 13 to rotate through the coupling 12, so that the impeller 10 in the pump body 2 rotates. When the impeller 10 rotates, the rotating impeller 10 exerts force on the fluid, giving the fluid an impulse in the direction of fluid movement to transfer kinetic energy to achieve fluid transportation. The fluid passes through the flow cavity 9 of the guide shell in the pump body 2 and is guided to the next-level impeller 10. The liquid flows through all the impellers 10 and the guide shell one by one, further increasing the pressure energy of the liquid. After passing the highest point, the fluid is transported downward through the impeller 10 and finally transported to the liquid outlet pipe 7.

[0055] During the process of fluid transportation by the impeller 10, a movable ring 14 is provided at one end of the rotating shaft 13 close to the bearing, a limit fixing ring 16 is provided below the bearing mounting groove of the pump body 2, and a spring 17 is provided between the limit fixing ring 16 and the movable ring 14. When the fluid in the circulation chamber 9 impacts the movable ring 14, the fluid impact pressure generates a closing thrust on the movable ring 14 so that the movable ring 14 and the limit fixing ring 16 are closed.

[0056] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A vertical multistage centrifugal pipeline pump, comprising a driving motor (1), a pump body (2), a mounting cover (3), a plurality of mounting bolts (4), a plurality of mounting nuts (5), a liquid inlet pipe (6), a liquid outlet pipe (7) and a plurality of impellers (10), characterized in that: The pump body (2) is provided with a circulation cavity (9), a plurality of impellers (10) are arranged in the pump body (2), a coupling (12) is coaxially provided in the mounting cover (3), the output end of the drive motor (1) is coaxially fixedly connected to the coupling (12), an end of the coupling (12) away from the drive motor (1) is coaxially fixedly connected to a rotating shaft (13), the rotating shaft (13) is coaxially fixedly connected to the plurality of impellers (10), and a sealing mechanism is provided at a rotational connection between the rotating shaft (13) and the pump body (2) for preventing the rotational connection between the rotating shaft (13) and the pump body (2) from loosening and causing fluid leakage.

2. A vertical multistage centrifugal pipeline pump according to claim 1, characterized in that: The two ends of the mounting cover (3) are respectively fixedly connected to the drive motor (1) and the pump body (2) via a plurality of mounting bolts (4) and a plurality of mounting nuts (5).

3. A vertical multistage centrifugal pipeline pump according to claim 1, characterized in that: The sealing mechanism comprises: A movable sleeve (14), the movable sleeve (14) being coaxially arranged on the outer side wall of the rotating shaft (13), and a first mounting groove being formed at one end of the movable sleeve (14) close to the driving motor (1); A position-limiting fixing collar (16), wherein the position-limiting fixing collar (16) is fixedly arranged on the pump body (2), the rotating shaft (13) is coaxially inserted in the position-limiting fixing collar (16), and a second mounting groove is formed at one end of the position-limiting fixing collar (16) away from the driving motor (1) and corresponding to the first mounting groove; A spring (17), wherein two ends of the spring (17) are respectively fixedly connected to the inner walls of the first mounting groove and the second mounting groove, and the spring (17) is coaxially sleeved on the outer side of the rotating shaft (13).

4. A vertical multistage centrifugal pipeline pump according to claim 3, characterized in that: A first sealing groove is provided on the movable contact surface between the movable sleeve ring (14) and the rotating shaft (13), a first sealing ring (15) is provided in the sealing groove, a second sealing ring is provided on the contact surface between the position-limiting fixed sleeve ring (16) and the pump body (2), and a third sealing ring is provided on the contact surface between the position-limiting fixed sleeve ring (16) and the rotating shaft (13).

5. A vertical multistage centrifugal pipeline pump according to claim 3, characterized in that: The ends of the movable sleeve ring (14) and the position-limiting fixed sleeve ring (16) that are close to each other are both provided with synthetic rubber pads.

6. A vertical multistage centrifugal pipeline pump according to claim 1, characterized in that: A mounting cylinder is coaxially arranged on the outer side of the impeller (10), and a plurality of the mounting cylinders are assembled and connected in sequence end to end. A sealing ring (18) is arranged on the contact surface between the impeller (10) and the rotating shaft (13).

7. A vertical multistage centrifugal pipeline pump according to claim 1, characterized in that: The liquid inlet pipe (6) and the liquid outlet pipe (7) are both connected to the flow cavity (9) of the pump body (2), and flange mounting plates (8) are provided on the liquid inlet pipe (6) and the liquid outlet pipe (7).

8. A vertical multistage centrifugal pipeline pump according to claim 1, characterized in that: An installation base plate (11) is provided at one end of the pump body (2) away from the drive motor (1).

Images