A lengthened shaft submersible pump

Abstract

The utility model relates to the technical field of chemical pump discloses a lengthened shaft liquid pump, include: mounting panel, motor assembly, lengthened pipe cylinder, lengthened axle, be provided with sealing assembly between lengthened axle and lengthened pipe cylinder, the top of lengthened axle connects the output of motor assembly, pump head is connected in the bottom of lengthened pipe cylinder, and the pump head includes pump shell, impeller, inflow port and outflow port, and the bottom of lengthened axle is connected impeller, and the outflow pipe is connected with outflow port, and one end of outflow pipe is fixed on mounting panel. Through the multiple, synergic sealing effect of first sealing ring, second sealing ring, first sealing sleeve and second sealing sleeve, a reliable sealing barrier is formed in the annular gap between lengthened axle and lengthened pipe cylinder. This can actively prevent the corrosive, flammable and explosive gas volatilized at the lower pump head from rising along the shaft gap, thereby completely avoiding the corrosion of the motor and its connecting components by the corrosive gas, greatly improving the service life and operation reliability of the motor.

Description

Technical Field

[0001] This utility model relates to the field of chemical pump technology, and in particular to an extended shaft submersible pump. Background Technology

[0002] In the chemical industry, the media being transported are often corrosive, flammable, explosive, toxic, or contain particulate matter. Traditional pumps (such as horizontal end-suction pumps) have their motors and pump bodies close together, posing a significant risk. Leakage risk: If the mechanical seal fails, hazardous media will leak directly into the environment, causing a safety accident.

[0003] Motor damage: Leaked corrosive gases can corrode the motor, causing it to be damaged.

[0004] Operating limitations: The pump cannot be submerged deep into containers such as storage tanks or pits for pumping liquid.

[0005] To address the aforementioned issues, existing technologies employ an extended shaft and intermediate pipe to create a "safety isolation section." Even if the pump seal experiences a minor leak, the leakage will be confined within this isolation section and will not immediately threaten the motor above.

[0006] However, these extended shafts and intermediate tubes are often only isolated without being sealed, allowing corrosive gases to corrode the motor along the intermediate tube. Utility Model Content

[0007] Based on the above, the purpose of this utility model is to provide an extended shaft submersible pump with good sealing performance, which can prevent the motor from being corroded.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides an extended shaft submersible pump, comprising: Mounting plate, on which the motor assembly is mounted; An extended tube is connected to the lower part of the mounting plate. An extended shaft is rotatably provided at the center of the extended tube. The extended shaft extends along the axial direction of the extended tube. A sealing assembly is provided between the extended shaft and the extended tube. The top of the extended shaft is connected to the output end of the motor assembly. A pump head is connected to the bottom of the extended tube. The pump head includes a pump casing, an impeller, an inlet, and an outlet. The bottom of the extended shaft is connected to the impeller. The outlet is connected to an outlet pipe, and one end of the outlet pipe is fixed to the mounting plate.

[0009] Preferably, the sealing assembly includes a first sealing ring, a second sealing ring, a first sealing sleeve, and a second sealing sleeve, wherein the first sealing ring, the second sealing ring, the first sealing sleeve, and the second sealing sleeve are all hollow structures with openings at the top and bottom; The extended tube has a first step on its inner wall near the top. The first sealing sleeve abuts against the first step. The inner ring of the first sealing sleeve is threaded to the second sealing sleeve. The inner wall of the second sealing sleeve has a first groove. The first sealing ring is inserted into the first groove. The outer wall of the second sealing ring has a second groove. The inner side of the first sealing ring can be inserted into the second groove. The extended shaft has a third groove. The second sealing ring can be inserted into the third groove.

[0010] Preferably, the extended shaft includes a central shaft and a bushing sleeved on the outside of the central shaft, and the third slot is disposed on the bushing sleeve; The bottom of the bushing is also connected to the inner wall of the bottom of the extended tube via a connecting plate.

[0011] Preferably, the mounting plate has mounting holes, and the top of the mounting holes extends outward to form a mounting groove, with the motor assembly connected above the mounting groove; A bearing housing is connected to the lower part of the motor assembly. The bearing housing is located in the mounting hole and a bearing is installed on the bearing housing. The extended shaft is connected to the inner ring of the bearing.

[0012] Preferably, the motor assembly includes a motor mounting base, the bottom of which is connected to the top of the mounting groove, and a bearing housing connected to the bottom of the motor mounting base. A motor is mounted on the motor mounting base, and the output end of the motor is connected to the top of the extended shaft via a coupling.

[0013] Preferably, the impeller has a connecting hole at its center, a locking ring is provided on the side of the connecting hole facing the extension shaft, and a locking cap is provided on the side of the connecting hole away from the extension shaft. The extension shaft passes through the locking ring and the connecting hole and is threadedly connected to the locking cap.

[0014] Preferably, the pump housing includes a lower housing and an upper housing, and the lower housing and the upper housing are threadedly connected.

[0015] Preferably, a sealing gasket is also provided between the lock cap and the impeller.

[0016] The beneficial effects of this utility model are as follows: (1) The core of this utility model lies in the dedicated sealing component installed inside the extended tube. This component, through the multiple and synergistic sealing effects of the first sealing ring, the second sealing ring, the first sealing sleeve, and the second sealing sleeve, forms one or more reliable sealing barriers in the annular gap between the extended shaft and the extended tube. This can actively prevent corrosive, flammable, and explosive gases volatilized at the pump head below from rising along the shaft gap, thereby completely avoiding the corrosion of the motor and its connecting parts by corrosive gases, and greatly improving the service life and operational reliability of the motor.

[0017] (2) In the sealing assembly, the first sealing sleeve and the second sealing sleeve are connected by threads and fit tightly with the sealing ring through a groove. This structure makes the entire sealing assembly an independent module, which can be easily installed and disassembled as a whole or separately. When the seal needs to be replaced due to long-term use, it is not necessary to disassemble the entire pump and motor, which simplifies maintenance and greatly reduces the later maintenance costs and time.

[0018] (3) The extended shaft adopts a combination structure of "central shaft + bushing", and the bottom of the bushing is fixed to the inner wall of the extended tube through a connecting plate. This structure greatly increases the radial support points of the extended shaft, especially its lower part, effectively reducing the deflection (bending) and vibration that may occur when the long shaft rotates at high speed. The drive shaft runs more smoothly, which not only reduces operating noise and energy consumption, but also reduces the wear of sealing components and bearings caused by vibration. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0020] Figure 1 This invention provides a schematic diagram of the structure of an extended shaft submersible pump according to an embodiment of the present invention; Figure 2 A cross-sectional structural diagram of an extended shaft submersible pump is provided for an embodiment of this utility model; Figure 3 This invention provides an exploded view of an extended shaft submersible pump according to an embodiment of the present invention. Figure 4 A schematic diagram of the extended tube, sealing assembly, and bearing seat provided in an embodiment of this utility model; Figure 5 for Figure 2 Enlarged diagram of point A.

[0021] In the picture: 1. Mounting plate; 11. Mounting hole; 12. Mounting groove; 13. Through hole; 2. Motor assembly; 21. Motor mounting base; 22. Motor; 23. Bearing housing; 24. Bearing; 25. Coupling; 3. Extended tube; 31. First step; 4. Extended shaft; 41. Central shaft; 42. Shaft sleeve; 43. Connecting plate; 44. Third slot; 5. Sealing assembly; 51. First sealing ring; 52. Second sealing ring; 53. First sealing sleeve; 54. Second sealing sleeve; 55. First slot; 56. Second slot; 6. Pump head; 61. Pump housing; 611. Lower housing; 612. Upper housing; 62. Impeller; 621. Connecting hole; 622. Locking ring; 623. Locking cap; 624. Sealing gasket; 63. Inlet; 64. Outlet; 65. Outlet pipe. Detailed Implementation

[0022] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0026] like Figures 1 to 5 As shown, this embodiment provides a submersible pump with an extended shaft 4, including a mounting plate 1, a motor assembly 2, an extended tube 3, an extended shaft 4, a sealing assembly 5, and a pump head 6.

[0027] The mounting plate 1 is a square plate structure used as a support and mounting reference for the entire pump. A mounting hole 11 is provided in the center of the mounting plate 1, and the top of the mounting hole 11 extends outward (i.e. upward) to form an annular mounting groove 12. The edges of the mounting plate 1 typically have through holes 13 for securing the entire pump to the top flange of a storage tank or pit using bolts.

[0028] The motor assembly 2 is disposed above the mounting plate 1. The motor assembly 2 includes a motor mounting base 21 and a motor 22. The bottom of the motor mounting base 21 is bolted to the top of the mounting groove 12. A bearing housing 23 is bolted to the bottom of the motor mounting base 21 and is positioned within the mounting hole 11. A bearing 24 is mounted on the bearing housing 23 to provide radial support. The motor 22 is fixedly mounted on the motor mounting base 21, and its output axis extends downwards.

[0029] The extended pipe 3 is fixedly connected to the lower part of the mounting plate 1 by a flange or welding, and extends vertically downward. The length of the extended pipe 3 can be customized according to the actual working conditions (such as the depth of the storage tank).

[0030] The extended shaft 4 is rotatably positioned at the center of the extended tube 3 and extends axially thereafter. The top of the extended shaft 4 is connected to the output end of the motor 22 via a coupling 25 and passes through the inner ring of a bearing 24, which provides upper radial support. The bottom of the extended shaft 4 is connected to the impeller 62 of the pump head 6.

[0031] A sealing component 5 of this invention is disposed within the annular gap between the extended shaft 4 and the extended tube 3, located near the top of the extended tube 3. Specifically, a first step 31 is formed on the inner wall of the extended tube 3 near the top. The sealing component 5 includes a first sealing ring 51, a second sealing ring 52, a first sealing sleeve 53, and a second sealing sleeve 54. These components are all hollow annular structures with openings at the top and bottom. The first sealing sleeve 53 is first placed and abuts against the first step 31. Then, the second sealing sleeve 54 is screwed into the inner ring of the first sealing sleeve 53 by the threads on its outer wall, thereby fixing the two together. A first groove 55 is formed on the inner wall of the second sealing sleeve 54. The first sealing ring 51 (usually an O-ring) is inserted into the first groove 55. A second groove 56 is formed on the outer wall of the second sealing ring 52, and the inner side of the first sealing ring 51 can be tightly inserted into the second groove 56, forming a first dynamic seal. Finally, a third groove 44 is formed on the extended shaft 4, and the inner side of the second sealing ring 52 can be tightly inserted into the third groove 44 to form a second dynamic seal. Through this multi-nested and groove-fitting structure, the sealing assembly 5 forms an effective sealing barrier in both the radial and axial directions of the extended shaft 4, greatly hindering the rise of corrosive gases below.

[0032] In some embodiments, such as Figures 2 to 4 As shown, the extended shaft 4 can adopt a split structure, including a central shaft 41 and a bushing 42 sleeved on the outside of the central shaft 41. The third slot 44 can be set on the bushing 42. This structure facilitates processing and assembly. More importantly, the bottom of the bushing 42 is also fixedly connected to the inner wall of the bottom of the extended tube 3 through one or more connecting plates 43. This structure greatly enhances the rigidity of the lower part of the extended shaft 4, effectively suppresses vibration and deflection during operation, ensures smooth operation, and extends the service life of the sealing assembly 5 and the bearing 24.

[0033] The pump head 6 is connected to the bottom of the extended tube 3. The pump head 6 includes a pump casing 61, an impeller 62, an inlet 63, and an outlet 64. The pump casing 61 can be formed by connecting a lower casing 611 and an upper casing 612 with threads, facilitating disassembly and maintenance. The bottom of the extended shaft 4 passes through the pump casing 61 and is connected to the impeller 62 in the following manner: a connecting hole 621 is provided in the center of the impeller 62; a locking ring 622 is provided on the side of the connecting hole 621 facing the extended shaft 4; and a locking cap 623 is provided on the side of the connecting hole 621 away from the extended shaft 4. The bottom of the extended shaft 4 passes through the locking ring 622 and the connecting hole 621 in sequence, and its end is threadedly connected to the locking cap 623, thereby securing the impeller 62. To ensure a seal, a sealing gasket 624 is also provided between the locking cap 623 and the impeller 62.

[0034] The outlet 64 of the pump head 6 is connected to an outlet pipe 65, which extends upward and its top end is fixed to the mounting plate 1. This structure provides stable support for the outlet pipe and reduces the impact of pipeline stress on the pump body.

[0035] During operation, motor 22 starts and drives extended shaft 4 to rotate via coupling 25, which in turn drives impeller 62 to rotate at high speed. Chemical liquid is drawn in through inlet 63 at the bottom of pump head 6, gains energy under the centrifugal force of impeller 62, increases in pressure, and is then discharged from outlet 64 through outlet pipe 65. During this process, even if corrosive gases evaporate from pump head 6, they are effectively blocked by sealing assembly 5 in the lower space of extended tube 3, preventing them from rising to the area where motor assembly 2 is located, thus protecting motor 22.

[0036] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An extended shaft submersible pump, characterized in that, include: Mounting plate, on which the motor assembly is mounted; An extended tube is connected to the lower part of the mounting plate. An extended shaft is rotatably provided at the center of the extended tube. The extended shaft extends along the axial direction of the extended tube. A sealing assembly is provided between the extended shaft and the extended tube. The top of the extended shaft is connected to the output end of the motor assembly. A pump head is connected to the bottom of the extended tube. The pump head includes a pump casing, an impeller, an inlet, and an outlet. The bottom of the extended shaft is connected to the impeller. The outlet is connected to an outlet pipe, and one end of the outlet pipe is fixed to the mounting plate.

2. The extended shaft submersible pump according to claim 1, characterized in that, The sealing assembly includes a first sealing ring, a second sealing ring, a first sealing sleeve, and a second sealing sleeve. The first sealing ring, the second sealing ring, the first sealing sleeve, and the second sealing sleeve are all hollow structures with openings at the top and bottom. The extended tube has a first step on its inner wall near the top. The first sealing sleeve abuts against the first step. The inner ring of the first sealing sleeve is threaded to the second sealing sleeve. The inner wall of the second sealing sleeve has a first groove. The first sealing ring is inserted into the first groove. The outer wall of the second sealing ring has a second groove. The inner side of the first sealing ring can be inserted into the second groove. The extended shaft has a third groove. The second sealing ring can be inserted into the third groove.

3. The extended shaft submersible pump according to claim 2, characterized in that, The extended shaft includes a central shaft and a bushing sleeve fitted on the outside of the central shaft, and the third slot is provided on the bushing sleeve; The bottom of the bushing is also connected to the inner wall of the bottom of the extended tube via a connecting plate.

4. The extended shaft submersible pump according to claim 1, characterized in that, The mounting plate has mounting holes, and the top of the mounting holes extends outward to form a mounting groove, with the motor assembly connected to the top of the mounting groove. A bearing housing is connected to the lower part of the motor assembly. The bearing housing is located in the mounting hole and a bearing is installed on the bearing housing. The extended shaft is connected to the inner ring of the bearing.

5. The extended shaft submersible pump according to claim 4, characterized in that, The motor assembly includes a motor mounting base, the bottom of which is connected to the top of the mounting groove, and a bearing housing connected to the bottom of the motor mounting base. A motor is mounted on the motor mounting base, and the output end of the motor is connected to the top of the extension shaft via a coupling.

6. The extended shaft submersible pump according to claim 1, characterized in that, The impeller has a connecting hole at its center. A locking ring is provided on the side of the connecting hole facing the extension shaft, and a locking cap is provided on the side of the connecting hole away from the extension shaft. The extension shaft passes through the locking ring and the connecting hole and is threadedly connected to the locking cap.

7. The extended shaft submersible pump according to claim 6, characterized in that, The pump housing includes a lower housing and an upper housing, and the lower housing and the upper housing are threadedly connected.

8. The extended shaft submersible pump according to claim 6, characterized in that, A sealing gasket is also provided between the lock cap and the impeller.

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