Cantilever submerged pump structure provided with mechanical seal

Abstract

The utility model discloses a cantilever submerged pump structure configured with a mechanical seal, which comprises a mounting bottom plate, a supporting pipe, a pump cover and a liquid inlet shell are sequentially arranged below the mounting bottom plate, the side surface of the liquid inlet shell is communicated with a liquid outlet pipe, a sealing box body, a bearing bracket and a motor bracket are sequentially arranged above the mounting bottom plate, and a motor is arranged at the top of the motor bracket. The lower portion of an output shaft of the motor is connected with a rotating shaft, the rotating shaft sequentially penetrates through the motor support, the bearing support, the sealing box body, the installation bottom plate, the supporting pipe and the pump cover, the lower end of the rotating shaft is arranged in the liquid inlet shell, and an impeller is arranged at the lower end of the rotating shaft. According to the submerged pump, the part below the sealing box body can be mechanically sealed, so that in the underwater operation process of the submerged pump, the pressure in the pump is stable, liquid cannot enter the pump, the friction loss of all accessories is reduced, the working efficiency is improved, the abrasion speed of the accessories is reduced, the service life is prolonged, and the operation time is longer.

Description

A cantilever submersible pump structure equipped with a mechanical seal Technical Field

[0001] This utility model belongs to the field of submersible pump technology, specifically a cantilever submersible pump structure equipped with a mechanical seal. Background Technology

[0002] Submersible pumps are suitable for long-term transportation of various corrosive media such as strong acids, alkalis, salts, and strong oxidants of any concentration. Their working parts are submerged in the liquid, ensuring leak-free shaft seals. They are characterized by their small footprint, reliable operation, convenient maintenance, and strong corrosion resistance. They are widely used in chemical, pharmaceutical, papermaking, and petroleum industries.

[0003] The existing submersible pump's vertical motor is bolted to the motor mount and directly driven by the pump via a flexible coupling. The pump body, intermediate connecting pipe, pump frame, outlet pipe, and pipe flange are all bolted together and fixed to a base plate. The entire pump is mounted on the container via the base plate. The pump's axial and radial forces (including water pressure generated during pump operation, impeller and rotor weight, etc.) are borne by single-direction thrust ball bearings and single-row radial ball bearings installed in the bearing housing, as well as by the sliding guide shaft, to ensure the pump's safe and normal operation. The bearings are lubricated with grease, and the guide bearing is lubricated by the liquid being pumped. Therefore, the liquid level must be higher than the impeller centerline during operation. Depending on the length L extending into the container, there are structures with intermediate guide bearings and structures without intermediate guide bearings. However, while existing submersible pumps are equipped with V-ring seals, which are convenient for installation and maintenance, during operation, the shaft and other components experience more friction, resulting in higher frictional losses, reduced efficiency, faster wear of components, and a shorter service life. Summary of the Invention

[0004] The purpose of this invention is to provide a cantilever submersible pump structure with a mechanical seal to solve the problems mentioned in the background art.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A cantilever submersible pump structure with a mechanical seal includes a mounting base plate. Below the mounting base plate, a support pipe, a pump cover, and an inlet housing are arranged in sequence. An outlet pipe is connected to the side of the inlet housing. Above the mounting base plate, a sealing housing, a bearing bracket, and a motor bracket are arranged in sequence. A motor is mounted on the top of the motor bracket. A rotating shaft is connected below the output shaft of the motor. The rotating shaft passes through the motor bracket, bearing bracket, sealing housing, mounting base plate, support pipe, and pump cover in sequence. The lower end of the rotating shaft is located inside the inlet housing, and an impeller is provided at the lower end of the rotating shaft.

[0007] Preferably, the support pipe and the pump cover, the support pipe and the mounting base plate, the mounting base plate and the sealing box, the connection between the rotating shaft and the pump cover, and the connection between the rotating shaft and the sealing box are all sealed.

[0008] Preferably, the rotating shaft and the bearing bracket are rotatably connected at both ends by bearings.

[0009] Preferably, the liquid inlet at the bottom of the liquid inlet housing is equipped with a filter screen.

[0010] Preferably, the outlet pipe adopts an L-shaped structure, with its horizontal section connected to the side of the inlet housing and its vertical section passing through the mounting base plate.

[0011] Preferably, the connection between the liquid outlet pipe and the mounting base plate is fixed by a liquid outlet pipe fixing flange, and a liquid outlet flange is provided at the upper end of the vertical section of the liquid outlet pipe.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0013] In this invention, by setting a sealing box above the mounting base plate, the part below the sealing box can be mechanically sealed, so that the pressure inside the pump is stable during the operation of the submersible pump, and liquid cannot enter. This reduces the friction loss of various components, improves working efficiency, reduces the wear rate of components, increases service life, and extends the operating time. Attached Figure Description

[0014] Figure 1 is a cross-sectional view of this utility model;

[0015] In the diagram: 1. Mounting base plate; 2. Support pipe; 3. Pump cover; 4. Inlet housing; 41. Filter screen; 5. Outlet pipe; 6. Sealed housing; 7. Bearing bracket; 71. Bearing; 8. Motor bracket; 81. Motor; 9. Shaft; 91. Impeller. Detailed Implementation

[0016] The specific embodiments of this utility model are described in detail below.

[0017] The "range" disclosed in this utility model is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 10–50 is listed for a specific parameter, it is also expected that ranges of 10–40 and 20–50 are also included. Furthermore, if the minimum range values ​​are listed as 1 and 2, and the maximum range values ​​are listed as 3, 4, and 5, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0–5" means that all real numbers between "0–5" have been listed herein; "0–5" is merely a shortened representation of these numerical combinations.

[0018] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0019] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0020] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0021] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0022] Unless otherwise specified, the reaction will proceed under normal temperature and pressure conditions.

[0023] Unless otherwise specified, all parts or percentages are by weight or by weight percentage.

[0024] In this invention, all the substances used are known substances that can be purchased or synthesized by known methods.

[0025] In this invention, all the devices or equipment used are conventional devices or equipment known in the art and are readily available.

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0027] Example:

[0028] A cantilever submersible pump structure with a mechanical seal, as shown in Figure 1, includes a mounting base plate 1. Below the mounting base plate 1, a support pipe 2, a pump cover 3, and an inlet housing 4 are arranged in sequence. An outlet pipe 5 is connected to the side of the inlet housing 4. Above the mounting base plate 1, a sealing box 6, a bearing bracket 7, and a motor bracket 8 are arranged in sequence. A motor 81 is mounted on the top of the motor bracket 8. A rotating shaft 9 is connected below the output shaft of the motor 81. The rotating shaft 9 passes through the motor bracket 8, the bearing bracket 7, the sealing box 6, the mounting base plate 1, the support pipe 2, and the pump cover 3 in sequence. The lower end of the rotating shaft 9 is located inside the inlet housing 4, and an impeller 91 is provided at the lower end of the rotating shaft 9.

[0029] In one possible implementation, a sealing structure is used between the support pipe 2 and the pump cover 3, between the support pipe 2 and the mounting base plate 1, between the mounting base plate 1 and the sealing box 6, at the connection between the rotating shaft 9 and the pump cover 3, and at the connection between the rotating shaft 9 and the sealing box 6.

[0030] In one possible implementation, mechanical seals are used between the support pipe 2 and the pump cover 3, between the support pipe 2 and the mounting base plate 1, between the mounting base plate 1 and the sealing housing 6, at the connection between the rotating shaft 9 and the pump cover 3, and at the connection between the rotating shaft 9 and the sealing housing 6.

[0031] In one possible implementation, the rotating shaft 9 and the bearing bracket 7 are rotatably connected at both ends by bearings 71.

[0032] In one possible implementation, the upper end of the rotating shaft 9 is sealed to the sealing housing 6, the lower end of the rotating shaft 9 is sealed to the pump cover 3, and the pump body below the sealing housing 6 is mechanically sealed, so that the pressure inside the pump is stable and liquid cannot enter.

[0033] In one possible implementation, a filter screen 41 is provided at the liquid inlet at the bottom of the liquid inlet housing 4.

[0034] In one possible implementation, the outlet pipe 5 adopts an L-shaped structure, with its horizontal section connected to the side of the inlet housing 4 and its vertical section passing through the mounting base plate 1.

[0035] In one possible implementation, the connection between the liquid outlet pipe 5 and the mounting base plate 1 is fixed by a liquid outlet pipe fixing flange, and the upper end of the vertical section of the liquid outlet pipe 5 is provided with a liquid outlet flange.

[0036] By adopting the above technical solution:

[0037] By setting a sealing housing 6 above the mounting base plate 1, a mechanical seal can be achieved for the part below the sealing housing 6, so that the pressure inside the pump is stable during the operation of the submersible pump, and liquid cannot enter. This reduces the friction loss of various components, improves working efficiency, reduces the wear rate of components, increases service life, and extends the operating time.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure of a cantilever submersible pump configured with a mechanical seal, characterized by: The system includes a mounting base plate (1), below which are arranged a support pipe (2), a pump cover (3), and an inlet housing (4). The side of the inlet housing (4) is connected to an outlet pipe (5). Above the mounting base plate (1) are arranged a sealing box (6), a bearing bracket (7), and a motor bracket (8). The top of the motor bracket (8) is equipped with a motor (81). The output shaft of the motor (81) is connected to a rotating shaft (9). The rotating shaft (9) passes through the motor bracket (8), the bearing bracket (7), the sealing box (6), the mounting base plate (1), the support pipe (2), and the pump cover (3) in sequence. The lower end of the rotating shaft (9) is located inside the inlet housing (4), and the lower end of the rotating shaft (9) is equipped with an impeller (91).

2. The cantilever submersible pump structure with a mechanical seal as described in claim 1, characterized in that: The support pipe (2) and the pump cover (3), the support pipe (2) and the mounting base plate (1), the mounting base plate (1) and the sealing box (6), the connection between the rotating shaft (9) and the pump cover (3), and the connection between the rotating shaft (9) and the sealing box (6) all adopt a sealing structure.

3. The cantilever submersible pump structure with a mechanical seal as described in claim 1, characterized in that: The rotating shaft (9) and the bearing bracket (7) are rotatably connected at both ends by bearings (71).

4. The cantilever submersible pump structure with a mechanical seal as described in claim 1, characterized in that: The liquid inlet at the bottom of the liquid inlet housing (4) is equipped with a filter screen (41).

5. The cantilever submersible pump structure with a mechanical seal as described in claim 1, characterized in that: The outlet pipe (5) adopts an L-shaped structure, with its horizontal section connected to the side of the inlet housing (4) and its vertical section passing through the mounting base plate (1).

6. A structure of a submersible pump with a mechanical seal as claimed in claim 5, wherein: The connection between the liquid outlet pipe (5) and the mounting base plate (1) is fixed by a liquid outlet pipe fixing flange, and the upper end of the vertical section of the liquid outlet pipe (5) is provided with a liquid outlet flange.

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