CN211082368U

CN211082368U - Submersible pump mechanical seal pressure reducing mechanism

Info

Publication number: CN211082368U
Application number: CN201921927138.0U
Authority: CN
Inventors: 姚孝祥
Original assignee: Wuxi Spring Hydro Equipment Co ltd
Current assignee: Wuxi Spring Hydro Equipment Co ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-07-24
Anticipated expiration: 2029-11-08

Abstract

The utility model discloses a immersible pump machine seals relief mechanism, it includes the motor, the support frame and the pump body, be provided with bearing bracket between the one end of support frame and the motor, other end fixed connection is on the pump body, install the bearing in the bearing bracket, the pivot of motor is passed the bearing, the support frame just stretches into in the pump body, install the machine in the support frame and seal the support, install on the machine seal the support with pivot complex one-level machine and seal, machine seals support and one-level machine and seals the inner space of cutting apart the formation of support frame and not communicating oil pocket and pressure release chamber, the tip that the pump body was stretched into in the pivot is installed the impeller, the pressure release hole has been seted up at the position that corresponds the pressure release chamber on the support frame, the vice impeller is installed. The submersible pump sealing and pressure reducing mechanism is simple in structure and easy to realize; and the sealing pressure of the primary mechanical seal during operation can be greatly reduced, the sealing effect is improved, the damage phenomenon is reduced, the service life of the mechanical seal is prolonged, and the maintenance of the submersible pump is reduced.

Description

Submersible pump mechanical seal pressure reducing mechanism

Technical Field

The utility model relates to a immersible pump especially relates to a immersible pump machine seals relief mechanism.

Background

The shaft seal of the submersible pump is mechanical seal, and the sealing pressure is an important factor influencing the service life and the sealing effect of the mechanical seal; the damage of the submersible pump is mostly the sealing failure of the mechanical seal, and the sealing service life and the sealing effect can be prolonged by reducing the sealing pressure. The conventional submersible pump shaft seal normally adopts two-stage or three-stage mechanical seal, the first stage mainly seals a medium to prevent the medium from entering an oil cavity, the sealing pressure borne by the pump during operation is basically the same as the pump lift, the sealing pressure borne by the pump during shutdown is the diving depth, the one-stage mechanical seal is the worst working condition, and the one-stage mechanical seal is also the common condition of the damage of the submersible pump seal. The sealing failure of the submersible pump is mostly the damage of the primary mechanical seal.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a immersible pump machine seals relief mechanism to solve the fragile problem of one-level machine seal of immersible pump among the prior art.

To achieve the purpose, the utility model adopts the following technical proposal:

a submersible pump sealing and pressure reducing mechanism comprises a motor, a support frame and a pump body, wherein a bearing support is arranged between one end of the support frame and the motor, the other end of the support frame is fixedly connected to the pump body, a bearing is arranged in the bearing bracket, a rotating shaft of the motor passes through the bearing and the supporting frame and extends into the pump body, a mechanical seal support is arranged in the support frame, a primary mechanical seal matched with the rotating shaft is arranged on the mechanical seal support, the machine seal bracket and the first-level machine seal divide the inner space of the supporting frame into an oil cavity and a pressure relief cavity which are not communicated, the end part of the rotating shaft extending into the pump body is provided with an impeller, wherein, the part of the supporting frame corresponding to the pressure relief cavity is provided with a pressure relief hole for discharging the medium leaked from the back of the impeller when the pump runs, and the part of the rotating shaft, which is positioned in the pressure relief cavity, is provided with an auxiliary impeller for reducing the sealing pressure of the primary mechanical seal during the operation of the pump.

Particularly, a secondary mechanical seal positioned in an oil cavity is arranged on the bearing support in a matching manner with the rotating shaft.

Particularly, the middle part of the support frame extends inwards to form a circle of mounting plate, and the mechanical seal support is fixed on the mounting plate through bolts.

In particular, the machine seal support extends towards one side facing the impeller with a retaining ring in which the expeller is mounted.

In particular, a sealing ring is arranged between the mechanical seal support and the mounting plate.

The utility model has the advantages that compared with the prior art, the submersible pump sealing and pressure reducing mechanism has simple structure and is easy to realize; and the sealing pressure of the primary mechanical seal during operation can be greatly reduced, the sealing effect is improved, the damage phenomenon is reduced, the service life of the mechanical seal is prolonged, and the maintenance of the submersible pump is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a pressure sealing and reducing mechanism of a submersible pump according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a mechanical seal pressure reducing mechanism of a submersible pump according to an embodiment of the present invention.

In the embodiment, the mechanical seal pressure reducing mechanism of the submersible pump comprises a motor 1, a support frame 2 and a pump body 3, wherein a bearing support 4 is arranged between one end of the support frame 2 and the motor 1, the other end of the support frame is fixedly connected to the pump body 3, a bearing 5 is arranged in the bearing support 4, a rotating shaft 6 of the motor 1 penetrates through the bearing 5 and the support frame 2 and extends into the pump body 3, a circle of mounting plate 7 extends inwards from the middle part of the support frame 2, a mechanical seal support 8 is fixed on the mounting plate 7 through bolts, and a sealing ring 9 is arranged between the contact surfaces of the bearing support and the bearing support, a first-stage mechanical seal 10 matched with the rotating shaft 6 is arranged on the mechanical seal support 8, the internal space of the support frame 2 is divided by the mechanical seal support 8 and the first-stage mechanical seal 10 to form an oil cavity 11 and a pressure relief cavity 12 which are not communicated, an impeller 13 is arranged at the end part of the rotating shaft 6 extending into the pump body 3, and a second-stage mechanical seal 14 positioned in the oil cavity 11 is arranged on the bearing support 4 in a matched manner with the rotating shaft 6.

The supporting frame 2 is provided with a pressure relief hole 15 corresponding to the pressure relief cavity 12 for discharging a medium leaked from the back of the impeller 13 during pump operation, the machine seal support 8 extends towards one side of the impeller 13 to form a retaining ring 16, the part of the rotating shaft 6 located in the pressure relief cavity 12 is provided with an auxiliary impeller 17 for reducing the sealing pressure of the primary machine seal 10 during pump operation, and the auxiliary impeller 17 is located in the retaining ring 16.

In the submersible pump mechanical seal pressure reducing mechanism, in order to reduce the sealing pressure of the first-level mechanical seal 10 during the pump operation, an auxiliary impeller 17 device is added in a cavity between the first-level mechanical seal 10 and the impeller 13 to play a role in reducing pressure, and a pressure relief hole 15 is added on the side surface of the support frame 2; when the pump is in operation, a medium leaked from the back of the impeller 13 can be discharged through the pressure relief hole 15, the auxiliary impeller 17 generates a pressure reduction effect when rotating, so that the sealing pressure of the first-level mechanical seal 10 is reduced, and the sealing pressure of the first-level mechanical seal 10 can be close to zero through reasonable calculation; the sealing pressure born when the machine is stopped is the diving depth.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A submersible pump sealing and pressure reducing mechanism comprises a motor, a support frame and a pump body, wherein a bearing support is arranged between one end of the support frame and the motor, the other end of the support frame is fixedly connected to the pump body, a bearing is arranged in the bearing bracket, a rotating shaft of the motor passes through the bearing and the supporting frame and extends into the pump body, a mechanical seal support is arranged in the support frame, a primary mechanical seal matched with the rotating shaft is arranged on the mechanical seal support, the machine seal bracket and the first-level machine seal divide the inner space of the supporting frame into an oil cavity and a pressure relief cavity which are not communicated, the end part of the rotating shaft extending into the pump body is provided with an impeller, it is characterized in that the part of the supporting frame corresponding to the pressure relief cavity is provided with a pressure relief hole for discharging medium leaked from the back of the impeller when the pump runs, and the part of the rotating shaft, which is positioned in the pressure relief cavity, is provided with an auxiliary impeller for reducing the sealing pressure of the primary mechanical seal during the operation of the pump.

2. A submersible pump mechanical seal pressure relief mechanism according to claim 1, wherein a secondary mechanical seal located in the oil cavity is mounted on the bearing support in cooperation with the rotating shaft.

3. The mechanical seal pressure reducing mechanism of the submersible pump according to claim 1, wherein a circle of mounting plate extends inwards from the middle part of the support frame, and the mechanical seal support is fixed on the mounting plate through bolts.

4. A submersible pump mechanical seal pressure relief mechanism according to claim 3, wherein the mechanical seal holder has a retaining ring extending towards a side of the impeller, the secondary impeller being mounted within the retaining ring.

5. A submersible pump mechanical seal pressure relief mechanism as set forth in claim 3, wherein a seal ring is disposed between said mechanical seal support and said mounting plate.