Axial flow pump with double mechanical seal

Abstract

The utility model relates to the technical field of axial flow pump, and disclose a kind of axial flow pump using double-end face mechanical seal, including pump shell, the upper portion of pump shell is equipped with fixed shell, the upper end of fixed shell is equipped with motor, and the output end drive connection of motor towards fixed shell inside is equipped with rotating shaft, and rotating shaft is at the connecting place of fixed shell and pump shell and is provided with double-end face mechanical seal assembly, and water hammer elimination mechanism consisting of first chamber and second chamber is set in the connecting sleeve of fixed shell, using the cooperation of first chamber side inverted conical structure, bottom port sectorial resistance block, inner inclined limit rod and spring, when water hammer rushes to first chamber, sectorial resistance block is preliminary buffered under the extrusion of spring, and then the water hammer of second chamber from the gap between sectorial resistance block is secondarily buffered by sealing resistance block, effectively eliminate the impact force generated by water flow in pump shell water outlet elbow pipe part, avoid the damage caused by impact force to axial flow pump and pipeline, improve the use safety and stability of axial flow pump and pipeline.

Description

Technical Field

[0001] This utility model relates to the field of axial flow pump technology, specifically to an axial flow pump employing a double-end mechanical seal. Background Technology

[0002] Axial flow pumps, as common fluid transport devices, play an important role in many scenarios such as water conservancy irrigation, urban water supply, and industrial circulating water. The stability and reliability of their performance directly affect the operating efficiency and safety of related systems.

[0003] In existing axial flow pump technology, when the pump is running, the water flow at the outlet bend of the pump casing is prone to generating impact force, also known as water hammer. Most existing axial flow pump structures lack an effective mechanism specifically designed to eliminate this water hammer impact. Due to the absence of a dedicated buffer structure, the powerful impact force generated by water hammer acts directly on the axial flow pump and its connected piping. Prolonged exposure to this impact force can easily damage internal components of the axial flow pump, such as accelerated wear of seals and impeller loosening. Pipelines may also experience ruptures and deformations. This not only significantly shortens the service life of the axial flow pump and piping but also increases equipment maintenance costs and downtime, affecting the normal operation of the entire fluid transport system. Therefore, those skilled in the art have provided an axial flow pump employing a double-end mechanical seal to address the problems mentioned in the background section. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an axial flow pump employing a double-end mechanical seal, thereby solving the problem that most existing axial flow pump structures lack an effective mechanism specifically designed to eliminate water hammer impact.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an axial flow pump employing a double-end mechanical seal, comprising a pump casing, a fixed shell mounted on the upper part of the pump casing, a motor mounted on the upper end of the fixed shell, a rotating shaft driven by the motor toward the output end of the fixed shell, a double-end mechanical seal assembly provided at the connection between the rotating shaft and the fixed shell, an impeller mounted at the bottom end of the rotating shaft inside the pump casing, a connecting sleeve provided inside the fixed shell, a first chamber and a second chamber provided inside the connecting sleeve, a limit rod provided in the first chamber, a spring sleeved on the limit rod, a fan-shaped blocking block provided in the bottom port of the first chamber, and a sealing blocking block provided in the second chamber.

[0006] Preferably, a pressure gauge is provided on the top of the connecting sleeve, and the second chamber is located above the first chamber. The pressure gauge allows for real-time monitoring of the internal pressure of the water hammer eliminator.

[0007] Preferably, the first chamber is inverted conical, and one end of the limiting rod is connected to the top side wall of the first chamber, with the limiting rod being inclined.

[0008] Preferably, the sector-shaped blocking block is slidably sleeved with the limiting rod, one end of the spring abuts against the inner wall of the first chamber, and the other end of the spring abuts against the sector-shaped blocking block. Four sector-shaped blocking blocks are provided, and there is a gap between adjacent sector-shaped blocking blocks.

[0009] Preferably, the connecting sleeve is connected to the pump casing. When water hammer surges into the first chamber of the connecting sleeve, it is initially buffered by the compression and blocking of the fan-shaped blocking blocks and the spring. Then, the water hammer from the gap between the fan-shaped blocking blocks continues to enter the second chamber, where it is buffered a second time by the sealing blocking blocks. The water hammer elimination mechanism can eliminate the impact force generated by the water flow in the outlet bend of the pump casing.

[0010] Compared with the prior art, this utility model provides an axial flow pump with a double-end mechanical seal, which has the following advantages:

[0011] By designing a water hammer elimination mechanism consisting of a first chamber and a second chamber, a connecting sleeve is installed inside the fixed shell. Utilizing the inverted conical structure on the side of the first chamber, the fan-shaped blocking block at the bottom port, the inwardly inclined limiting rod, and the spring, when water hammer surges into the first chamber, the fan-shaped blocking block initially buffers it under the compression of the spring. Then, the water hammer entering the second chamber through the gap between the fan-shaped blocking blocks is further buffered by the sealing blocking block. This effectively eliminates the impact force generated by the water flow at the outlet bend of the pump casing, avoids damage to the axial flow pump and pipeline caused by the impact force, and improves the safety and stability of the axial flow pump and pipeline. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural schematic diagram of an axial flow pump employing a double-end mechanical seal, provided in an embodiment of this application.

[0013] Figure 2 This is a structural cross-sectional view of the pump casing in an axial flow pump employing a double-end mechanical seal, as provided in an embodiment of this application.

[0014] Figure 3 This is a cross-sectional view of the connecting sleeve in an axial flow pump employing a double-end mechanical seal, as provided in an embodiment of this application.

[0015] In the diagram: 1. Pump casing; 2. Fixed casing; 3. Motor; 301. Shaft; 4. Double-end mechanical seal assembly; 5. Impeller; 6. Connecting sleeve; 601. First chamber; 602. Second chamber; 7. Limiting rod; 8. Spring; 9. Sector-shaped stop block; 10. Sealing stop block; 11. Pressure gauge. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides a technical solution: an axial flow pump employing a double-end mechanical seal. Please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 The device includes a pump casing 1, a fixed casing 2 mounted on the upper part of the pump casing 1, a motor 3 mounted on the upper end of the fixed casing 2, a drive shaft 301 connected to the output end of the motor 3 facing the fixed casing 2, a double-end mechanical seal assembly 4 set at the connection between the fixed casing 2 and the pump casing 1 on the shaft 301, an impeller 5 mounted on the bottom end of the shaft 301 inside the pump casing 1, a connecting sleeve 6 set inside the fixed casing 2, a first chamber 601 and a second chamber 602 opened inside the connecting sleeve 6, a limit rod 7 set inside the first chamber 601, a spring 8 sleeved on the limit rod 7, a fan-shaped blocking block 9 set inside the bottom port of the first chamber 601, a sealing blocking block 10 set inside the second chamber 602, a pressure gauge 11 set on the top of the connecting sleeve 6, and the second chamber 602 opened above the first chamber 601. The pressure gauge 11 is set to observe the internal pressure of the water hammer eliminator in real time.

[0018] The first chamber 601 is inverted conical in shape. One end of the limiting rod 7 is connected to the top side wall of the first chamber 601. The limiting rod 7 is inclined. The fan-shaped blocking block 9 is slidably sleeved with the limiting rod 7. One end of the spring 8 presses against the inner wall of the first chamber 601, and the other end of the spring 8 presses against the fan-shaped blocking block 9. There are four fan-shaped blocking blocks 9, and there are gaps between adjacent fan-shaped blocking blocks 9. The connecting sleeve 6 is connected to the pump casing 1. When water hammer rushes towards the first chamber 601 of the connecting sleeve 6, it can be initially buffered by the compression and blocking of the fan-shaped blocking blocks 9 and the spring 8. Then, the water hammer from the gap between the fan-shaped blocking blocks 9 continues to enter the second chamber 602, and is buffered a second time by the sealing blocking block 10. The impact force generated by the water flow in the outlet bend of the pump casing 1 can be eliminated by this water hammer elimination mechanism.

[0019] The working principle of this device is as follows: The upper end of the pump casing 1 is the outlet bend, and the upper end of the outlet bend is equipped with a fixed casing 2. A motor 3 is installed on the top of the fixed casing 2. The output end of the motor 3 towards the fixed casing 2 drives the rotating shaft 301. The rotating shaft 301 is located at the connection between the fixed casing 2 and the pump casing 1, where a double-end mechanical seal assembly 4 is provided. A connecting sleeve 6 is installed inside the fixed casing 2. The connecting sleeve 6 is composed of a first chamber 601 and a second chamber 602 to form a water hammer elimination mechanism.

[0020] The first chamber 601 of the connecting sleeve 6 is located below the second chamber 602. The first chamber 601 is laterally tapered, and a fan-shaped blocking block 9 is provided at the bottom port of the first chamber 601. A limiting rod 7 is inclinedly provided inside the first chamber 601, and a spring 8 is sleeved on the limiting rod 7. The fan-shaped blocking block 9 is slidably sleeved with the limiting rod 7. Under the compression of the spring 8, the bidirectional blocking block is always located at the lower port of the first chamber 601. When water hammer surges into the first chamber 601 of the connecting sleeve 6, it can be initially buffered by the compression and blocking of the fan-shaped blocking block 9 and the spring 8. Then, the water hammer from the gap between the fan-shaped blocking blocks 9 continues to enter the second chamber 602, and is buffered a second time by the sealing blocking block 10. The water hammer elimination mechanism can eliminate the impact force generated by the water flow in the outlet bend of the pump casing 1, and prevent the impact force from damaging the axial flow pump and the pipeline.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] In this document, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., 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 connection of two components or the interaction between two components. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An axial flow pump employing a double-end mechanical seal, comprising a pump casing (1), characterized in that: A fixed shell (2) is installed on the upper part of the pump casing (1). A motor (3) is installed on the upper end of the fixed shell (2). The motor (3) drives a rotating shaft (301) to the output end inside the fixed shell (2). A double-end mechanical seal assembly (4) is provided at the connection between the fixed shell (2) and the pump casing (1) on the rotating shaft (301). An impeller (5) is installed at the bottom end of the rotating shaft (301) inside the pump casing (1). A connecting sleeve (6) is provided inside the fixed shell (2). A first chamber (601) and a second chamber (602) are opened inside the connecting sleeve (6). A limit rod (7) is provided inside the first chamber (601). A spring (8) is sleeved on the limit rod (7). A fan-shaped blocking block (9) is provided inside the bottom port of the first chamber (601). A sealing blocking block (10) is provided inside the second chamber (602).

2. An axial flow pump employing a double-end mechanical seal according to claim 1, characterized in that: A pressure gauge (11) is provided on the top of the connecting sleeve (6), and the second chamber (602) is opened on the upper side of the first chamber (601).

3. An axial flow pump employing a double-end mechanical seal according to claim 1, characterized in that: The first chamber (601) is inverted cone-shaped.

4. An axial flow pump employing a double-end mechanical seal according to claim 1, characterized in that: One end of the limiting rod (7) is connected to the top side wall of the first chamber (601), and the limiting rod (7) is inclined.

5. An axial flow pump employing a double-end mechanical seal according to claim 1, characterized in that: The sector-shaped block (9) is slidably sleeved with the limiting rod (7). One end of the spring (8) presses against the inner wall of the first chamber (601), and the other end of the spring (8) presses against the sector-shaped block (9). There are four sector-shaped blocks (9), and there are gaps between adjacent sector-shaped blocks (9).

6. An axial flow pump employing a double-end mechanical seal according to claim 1, characterized in that: The connecting sleeve (6) is connected to the pump casing (1).

Images