Large submersible tubular pump

Abstract

The utility model discloses a large submersible tubular pump, which relates to the technical field of fluid machinery and comprises a pump shaft, an impeller chamber, a guide vane body, a planetary gear box and a submersible motor, the impeller chamber, the guide vane body, the planetary gear box and the submersible motor are sequentially arranged, and the pump shaft adopts a unique three-bearing support system: a cylindrical roller bearing and a thrust self-aligning roller bearing are arranged on one side close to an impeller and are arranged in parallel; the self-aligning roller bearing is arranged on one side close to the planetary gear box; the cylindrical roller bearing mainly bears huge radial load, the thrust self-aligning roller bearing mainly bears axial thrust in the main direction, the self-aligning roller bearing is used for bearing reverse axial force and providing auxiliary radial support, and the thrust self-aligning roller bearing and the self-aligning roller bearing cooperate to form a self-adaptive self-aligning mechanism. Through load separation and double-end cooperative aligning, the problems that a traditional bearing configuration is insufficient in bearing capacity under heavy load and complex working conditions, sensitive to installation and operation deformation and prone to causing vibration are solved, the operation reliability and stability of a pump set are improved, and the service life of the pump set is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid machinery technical field, concretely relates to a large -scale submersible tubular pump, especially related to the high reliability bearing system for supporting the pump shaft in the tubular pump. BACKGROUND

[0002] Submersible tubular pump is the key water conservancy equipment for large flow, low lift working condition. In order to drive large diameter impeller to run at high efficient speed, modern large -scale submersible tubular pump is generally integrated planetary gear reducer between motor and pump body to realize speed reduction and torque increase.

[0003] However, this structure makes the pump shaft bear huge hydraulic radial force and bidirectional axial thrust, and its support system also needs to adapt to the complex load transmitted by the gear box. The traditional bearing configuration often faces the challenges of carrying capacity and adaptability when dealing with such heavy load, variable load and installation error working conditions. For example, the common scheme of "a pair of tapered roller bearings and a deep groove ball bearing": tapered roller bearings are mainly used to bear radial force and axial force in one direction, and deep groove ball bearings are mainly used to bear reverse axial force and provide auxiliary radial support. This scheme has obvious defects in actual operation: when the radial load and reverse axial load of the water pump (such as start-up, water hammer and other working conditions) are particularly large, the carrying capacity of the deep groove ball bearing is limited, which leads to the fact that the entire bearing system cannot handle excessive load and becomes a weak link in the structure. More generally, such traditional combination is difficult to meet the extremely high radial and bidirectional axial bearing requirements in limited space, and is prone to early fatigue damage; and the compensation ability for shaft deformation caused by installation, temperature or load is limited, which leads to uneven internal load, additional wear and vibration.

[0004] Therefore, a new bearing support scheme is urgently needed to solve the technical problems of short bearing life, large vibration and poor adaptability of large submersible tubular pump under heavy load and complex working conditions, especially the traditional configuration cannot simultaneously bear large radial force and large bidirectional axial force. UTILITY MODEL CONTENTS

[0005] In view of the problems existing in the prior art, the utility model provides a large -scale submersible tubular pump, which realizes efficient and reliable separation and bearing of radial load and bidirectional axial load through three bearing collaborative support, and has the ability of automatically compensating installation and running deviation, thereby improving the running stability, reliability and service life of the whole machine under heavy load and complex working conditions.

[0006] The technical solution adopted by this utility model is as follows: A large submersible axial flow pump includes an inlet cone pipe, an impeller chamber, a guide vane body, a guide vane body sleeve, a planetary gearbox, a submersible motor, and an outlet cone pipe arranged sequentially along the water flow direction. An impeller is disposed in the impeller chamber, and a pump shaft is disposed between the impeller and the planetary gearbox. The pump shaft is supported by a three-bearing support system. The three-bearing support system includes: cylindrical roller bearings and thrust self-aligning roller bearings arranged side-by-side near the impeller, and a self-aligning roller bearing arranged near the planetary gearbox.

[0007] The cylindrical roller bearing is configured to bear the radial load of the pump shaft; the thrust self-aligning roller bearing is configured to bear the axial thrust along a first direction; the self-aligning roller bearing is configured to bear the axial thrust in a second direction opposite to the first direction and provide auxiliary radial support to the pump shaft; the thrust self-aligning roller bearing and the self-aligning roller bearing work together to form an adaptive self-aligning mechanism for dynamically compensating for the installation alignment error and running deformation of the pump shaft.

[0008] Furthermore, the cylindrical roller bearing is located on the side of the thrust self-aligning roller bearing closer to the impeller.

[0009] Furthermore, the cylindrical roller bearing and the thrust self-aligning roller bearing are disposed in the first bearing housing, and the self-aligning roller bearing is disposed in the second bearing housing.

[0010] Furthermore, the first bearing housing is provided with a combined double mechanical seal device on its side near the impeller.

[0011] The beneficial effects of this utility model are as follows:

[0012] (1) This utility model constructs a "three-bearing" system with clear division of labor and collaborative bearing, thereby improving the bearing capacity. By using cylindrical roller bearings as the radial main bearing component, its advantages of line contact, high rigidity, and extremely high radial bearing capacity are fully utilized. It is set at the heavy-load end closest to the impeller to bear the large radial force generated by factors such as impeller hydraulic imbalance, and to provide a stable rotation center for the pump shaft. By using thrust self-aligning roller bearings, which are also located at the heavy-load end and arranged in parallel with cylindrical roller bearings, they are specifically used to bear the huge axial thrust in the main direction. Self-aligning roller bearings are set on the side close to the planetary gearbox to bear the reverse axial thrust and provide auxiliary radial support. The three bearings are arranged in a "two-end arrangement and parallel arrangement at the heavy-load end" pattern in space. In terms of function, they achieve precise separation of "radial, main axial, and reverse axial" and dedicated shaft bearing, which solves the bottleneck of insufficient bearing capacity of traditional solutions (such as using deep groove ball bearings to bear the reverse force) when the reverse axial force is very large. This allows the pump shaft system to maximize the radial and bidirectional axial bearing capacity in a limited space.

[0013] (2) The thrust self-aligning roller bearing and the self-aligning roller bearing both have self-aligning functions, and the two form a "double self-aligning collaborative system" at both ends of the pump shaft, which can dynamically and automatically compensate for the misalignment error caused by the machining of large components, the on-site installation, and the bending or angular displacement of the shaft system caused by temperature changes, foundation settlement and uneven hydraulic load during operation, so as to ensure that the three bearings can still maintain uniform distribution of internal load even in the presence of certain misalignment, avoid early failure caused by edge stress concentration, and greatly enhance the adaptability and fault tolerance to complex operating environments;

[0014] (3) The three-bearing support system of the utility model runs stably, and the vibration and noise are significantly reduced, so that the probability of failure modes such as wear, fatigue spalling and the like is greatly reduced, the service life of the bearings and related sealing elements is prolonged, and the reliability and maintenance-free period of the whole machine are improved, and the operation and maintenance costs are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the overall structure schematic view of the utility model.

[0016] Figure 2 is Figure 1 the local enlarged view of A in the figure.

[0017] Figure 3 is Figure 1 the local enlarged view of B in the figure.

[0018] In the figure: 1 - inlet cone pipe, 2 - impeller chamber, 3 - impeller, 4 - guide vane body, 5 - guide vane body sleeve, 6 - planetary gear box, 7 - submersible motor, 8 - outlet cone pipe, 9 - pump shaft, 10 - first bearing body, 11 - cylindrical roller bearing, 12 - thrust self-aligning roller bearing, 13 - combined double mechanical seal device, 14 - second bearing body, 15 - self-aligning roller bearing. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the following will combine the description and the preferred embodiments of the drawings to make a more comprehensive and detailed description of the utility model, but the protection scope of the utility model is not limited to the following specific embodiments.

[0020] As Figures 1-3As shown, the large submersible through-flow pump provided by the embodiment includes, in sequence along the water flow direction, an inlet cone pipe 1, an impeller chamber 2, a guide vane body 4, a guide vane body sleeve 5, a planetary gear box 6, a submersible motor 7, and an outlet cone pipe 8. These components are rigidly connected through flanges or bolts to form a sealed unit that can be submersed in water for operation. An impeller 3 is installed at the end of a pump shaft 9 in the impeller chamber 2. The output power of the submersible motor 7 drives the pump shaft 9 and the impeller 3 to rotate and work after being decelerated and torque-increased by the planetary gear box 6. The guide vane body 4 is used to convert the rotational kinetic energy of the water flow discharged by the impeller 3 into axial pressure energy.

[0021] In the utility model, the pump shaft 9 is supported with high reliability by a specially designed three-bearing support system. The system specifically includes a cylindrical roller bearing 11 and a thrust self-aligning roller bearing 12 arranged on the side close to the impeller 3, and a self-aligning roller bearing 15 arranged on the side close to the planetary gear box 6.

[0022] The cylindrical roller bearing 11 and the thrust self-aligning roller bearing 12 are arranged side by side and integrated in the first bearing body 10. In the embodiment, the cylindrical roller bearing 11 is arranged at a position closer to the front end of the impeller 3, and the thrust self-aligning roller bearing 12 is arranged behind it.

[0023] The inner ring of the cylindrical roller bearing 11 is installed on the pump shaft 9, and the outer ring is installed in the first bearing body 10. The bearing is mainly configured and selected to bear the main radial load (such as the hydraulic unbalance force of the impeller) generated during pump operation, and its high radial stiffness and load-carrying capacity ensure the stability of the rotation center of the pump shaft 9.

[0024] The shaft ring of the thrust self-aligning roller bearing 12 is installed on the shaft shoulder or sleeve of the pump shaft 9, and the seat ring is installed in the first bearing body 10. The bearing is mainly configured and selected to bear the main axial thrust directed to the submersible motor 7. At the same time, due to its spherical raceway design, it has self-aligning ability.

[0025] In order to protect the bearings inside the first bearing body 10 from being invaded by the pumping medium, a combined double mechanical seal device 13 is arranged on the shell of the first bearing body 10 at the end closest to the impeller 3, which surrounds the pump shaft 9 and effectively isolates the water flow.

[0026] The self-aligning roller bearing 15 is arranged on one side close to the planetary gear box 6. The inner ring of the self-aligning roller bearing 15 is mounted on the pump shaft 9, and the outer ring is mounted in the second bearing body 14. The bearing is mainly configured to bear the reverse axial thrust opposite to the main thrust direction, such as the axial force generated during pump start, stop or special hydraulic transient state. In addition, it also provides auxiliary radial support, and cooperates with the cylindrical roller bearing 11 to constrain the pump shaft 9, thereby improving the overall stiffness of the shaft system. Similarly, the spherical raceway design of the self-aligning roller bearing 15 enables it to have self-aligning capability.

[0027] In the embodiment, the thrust self-aligning roller bearing 12 and the self-aligning roller bearing 15 are not isolated, but are in a mirror image on both ends of the pump shaft 9, and cooperatively constitute an adaptive self-aligning mechanism. When the pump shaft 9 is slightly bent or angularly displaced due to machining errors of large components, on-site installation and centering deviation, or in operation due to temperature changes, uneven settlement of the foundation, asymmetric hydraulic load and the like, both bearings can automatically adjust the relative angle of the inner and outer rings through the respective spherical raceways, thereby compensating for the misalignment. The double-end self-aligning mechanism can ensure that the rolling elements and the raceway of the bearing always maintain good contact, avoid problems such as severe uneven internal load and edge stress concentration of the bearing caused by deformation of the shaft system, and enable the bearing to operate in an optimal state.

[0028] The embodiment realizes precise, efficient and highly reliable bearing of radial force and bidirectional axial force through the specific three-bearing combination of "cylindrical roller bearing + thrust self-aligning roller bearing" and "self-aligning roller bearing", and forms excellent system adaptive capability by using the self-aligning bearings at both ends. The design effectively solves the technical problems of short bearing system life, large vibration, sensitivity to installation and running deformation of large submersible tubular pumps under heavy load and complex working conditions, and significantly improves the running stability and reliability of the whole machine.

[0029] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent substitutions or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A large submersible through-flow pump, comprising, in sequence along the water flow direction, an inlet cone pipe (1), an impeller chamber (2), a guide vane body (4), a guide vane body sleeve (5), a planetary gear box (6), a submersible motor (7), and an outlet cone pipe (8), wherein the impeller chamber (2) is provided with an impeller (3), and a pump shaft (9) is arranged between the impeller (3) and the planetary gear box (6), characterized in that: The pump shaft (9) is supported by a three-bearing support system, which comprises: a cylindrical roller bearing (11) and a thrust self-aligning roller bearing (12) arranged side by side near the impeller (3), and a self-aligning roller bearing (15) arranged near the planetary gear box (6); Wherein, the cylindrical roller bearing (11) is configured to bear the radial load of the pump shaft (9); the thrust self-aligning roller bearing (12) is configured to bear the axial thrust in the first direction; the self-aligning roller bearing (15) is configured to bear the axial thrust in the second direction opposite to the first direction, and to provide auxiliary radial support for the pump shaft (9); the thrust self-aligning roller bearing (12) and the self-aligning roller bearing (15) cooperatively constitute a self-adaptive self-aligning mechanism for dynamically compensating the installation alignment error and running deformation of the pump shaft (9).

2. A large submersible cross flow pump as claimed in claim 1, characterized in that: The cylindrical roller bearing (11) is located on the side of the thrust self-aligning roller bearing (12) close to the impeller (3).

3. A large submersible cross flow pump as claimed in claim 1 or 2, characterised in that: The cylindrical roller bearing (11) and the thrust self-aligning roller bearing (12) are arranged in a first bearing body (10), and the self-aligning roller bearing (15) is arranged in a second bearing body (14).

4. A large submersible cross flow pump as claimed in claim 3 wherein: The first bearing body (10) is provided with a combined double mechanical seal device (13) on the side close to the impeller (3).

Images