RU78534U1 - CENTRIFUGAL VERTICAL PUMP - Google Patents

Abstract

The proposed utility model relates to pumping technology and can be used to create installations for pumping from tanks, for example, an oil-water mixture with the presence of abrasive solids. The problem of creating pumps operating in difficult conditions is to increase their reliability, maintainability and facilitate routine maintenance, which, due to the specifics of the conditions, are carried out quite often and are quite expensive. The purpose of the proposed technical solution is to eliminate these disadvantages, i.e. improving the reliability of the device, facilitating and cheaper routine maintenance. To achieve this goal, technical solutions are presented in this utility model. In a centrifugal pump, comprising: an engine; a shaft line formed by two suspensions; a seal assembly comprising two mechanical seals and a separation chamber filled with a cooling lubricant; a flow part formed by an impeller located in the pump casing; challenge; leak sensor, according to a utility model, the lower mechanical seal is cooled by the fluid pumped through the channel in the pump unit housing, and the upper mechanical seal is cooled by a cutting fluid filled into the separation cavity, the leak sensor is located below the level of the bearings in the shaft cavity , what

increases the reliability of the device, because Moisture is detected before it enters the bearings. The upper bearing is located above the level of the base plate, which increases the reliability of the device, because the place through which moisture can enter the internal cavity of the shaft shaft, while being above the possible level of liquid that accumulates on the top of the plate and has a labyrinth seal. In the support below the overflow of the labyrinth seal, a drainage hole is made. Below the level of the bearings, a cavity (for collecting leaks and condensate) is made with an opening closed by a plug, which increases reliability and simplifies routine work to drain condensate from the bearing zone by unscrewing the plug. 1 pp; 2 ill.

Description

The proposed utility model relates to pumping technology and can be used to create installations for pumping from tanks, for example, an oil-water mixture with the presence of abrasive solids.

The problem of creating pumps operating in difficult conditions is to increase their reliability, maintainability and facilitate routine maintenance, which, due to the specifics of the conditions, are carried out quite often and are quite expensive.

Known semi-submersible vertical centrifugal pump NV-M manufactured by JSC "Dimitrovgradhimmash" (http://www.himmash.net), the disadvantage of which is the low reliability when pumping mixtures with the presence of abrasive impurities and, as a result, a short service life in such conditions.

Known semi-submersible centrifugal pump NV-D produced by JSC "Hydrogas" (see the catalog of products of JSC "Hydrogas" 2005, p.23, http://www.hydrogas.ru - prototype).

The pump includes a shaft line formed by two suspensions, a shaft sealing system consisting of two sequentially installed single mechanical seals and a separation oil cavity. The upper bearing is located below the level of the base plate. The oil cavity is formed by the lower part of the suspension and the wall. The flow part of the pump is a centrifugal type, with a spiral housing.

Torque is transmitted from the electric motor to the impeller through a shaft line. The shafts are interconnected by elastic couplings. The internal water supply cavity (lower suspension) has a float type leakage sensor installed in the upper part of the suspension so that its working body is located above the lower thrust bearing.

A disadvantage of the known solution is the insufficient reliability of the pump and the difficulty of its maintenance during routine maintenance. This is due to the fact that the leakage sensor is located above the lower thrust bearing and does not respond to changes in its working conditions (moisture ingress, insufficient lubrication and, as a result, overheating and destruction).

The purpose of the proposed technical solution is to eliminate these disadvantages, i.e. improving the reliability of the device, facilitating and cheaper routine maintenance.

To achieve this goal, technical solutions are presented in this utility model.

In a centrifugal pump, comprising: an engine; a shaft line formed by two suspensions; a seal assembly comprising two mechanical seals and a separation chamber filled with a cooling lubricant; a flow part formed by an impeller located in the pump casing; challenge; leak sensor, according to the utility model, the leak sensor is located in the inner cavity of the shaft line below the level of the bearings, which increases the reliability of the device, because Moisture is detected before it enters the bearings. Below the level of the bearings, a cavity (for collecting leaks and condensate) is made with an opening closed by a plug, which increases reliability and simplifies routine work to drain condensate from the bearing area (by unscrewing the plug). The upper bearing is located above the level of the base plate, which increases the reliability of the device, because the place through which moisture can enter the internal cavity of the shaft shaft, while being above the possible level of liquid that accumulates on the top of the plate and has a labyrinth seal. In the support below the overflow of the labyrinth seal, a drainage hole is made.

The proposed utility model is shown in the drawings, and in Fig.1 shows a General view of the device, in Fig.2 its enlarged lower part, where:

1. Electric motor

2. Prop

3. Cooker,

4. Suspension

5. Suspension

6. Seal housing,

7. The wall,

8. Pump housing

9. Impeller

10. Mechanical seals,

11. Shaft

12. Val

13. The elastic coupling

14. A cavity for collecting leaks,

15. Leakage sensor,

16. Separation chamber,

17. Bearing

18. Bearing

19. Bearing

20. Bearing

21. A hole with a plug

22. Shafting,

23. The challenge

24. Channel

25. Labyrinth seal

26. The drainage hole.

Semi-submersible vertical centrifugal pump, designed for pumping water-oil mixture from containers with the presence of abrasive solids. Main structural elements: electric motor (1), support (2), plate (3), pendants (4, 5), seal housing (6), wall (7), pump case (8), impeller (9), mechanical seals (10). The transmission of torque from the electric motor to the impeller is carried out using shafts (11, 12), elastic couplings (13). Leakage control in the inner cavity (14) of the shaft line (22) formed by the suspensions (4, 5) and the seal housing (6). carried out by a float sensor (15). For cooling and lubrication of mechanical seals, a separation cavity (16) is organized in which oil is poured. Shafts in suspensions are mounted on bearings (17-20). To control and drain leaks arising in the shaft line (22), a hole with a plug (21) is made in its lower part.

The operation of the device is as follows.

Before starting work, the pump is immersed in a container with liquid and the plate is fixed (3). In this case, fluid fills the pump casing (8).

When the engine (1) is started, the torque is transmitted by the shafts (11, 12) to the impeller (9), which creates a pressure of the liquid and lifts it through the outlet (23) to the outlet pipe. In this case, the cooling of the lower mechanical seal is carried out due to the flow of the pumped liquid through the channel (24), and the cooling of the upper mechanical seal is carried out by a cutting fluid filled into the separation cavity.

In the event of moisture formation (ingress through seals and / or condensate) in the shaft cavity cavities (22), it will collect in the leak collection cavities (14), and

since this cavity (14) is made below the level of the bearings, the presence of moisture in it will not affect the condition of the bearings, which increases the reliability of their operation. When the liquid reaches the level of the leakage sensor (15), it works, giving out information about the need for routine work to remove moisture, for which it is enough to unscrew the plug (21) and drain the condensate.

If moisture gets on top of the pump, it will accumulate on the surface of the plate (3) and inside the support (2). The fluid level in the area of the seal assembly will be determined by the location of the drainage hole (26). The raised upper part of the upper suspension will be above the liquid level, which will not lead to its leakage into the shaft line (22).

Thus, the use of the proposed utility model will improve the reliability of the pump, simplify and reduce the cost of routine maintenance.

Claims (1)

A centrifugal pump with a flowing part immersed in the pumped medium, comprising a motor, a shaft line formed by one or more suspensions, a flow line formed by an impeller located in the pump housing and a branch, a leakage sensor, characterized in that there is a separation cavity between the impeller and the shaft line with the double mechanical seal located in it, the shaft shafts are installed in the rolling bearings, while the lower mechanical seal is cooled due to leakage the fluid being pumped through the channel in the housing of the pumping unit, and the upper mechanical seal is cooled by a cutting fluid filled into the separation cavity, the leakage sensor is located below the level of the bearings in the internal cavity of the shaft, a cavity is arranged below the level of the bearings to collect leaks with a hole closed by a plug, and the top of the upper suspension is located above the level of the plate.