RU71710U1 - CENTRIFUGAL VERTICAL PUMP (OPTIONS) - 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 proposed that are presented in this utility model as options. In a first embodiment, 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.

In a second embodiment, 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 detector, according to the utility model, a cavity is made below the level of the bearings (for collecting leaks and condensate) 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. In a third embodiment, 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 detector, according to a utility model, the axial movement of the lower mechanical seal is limited by means of a support ring fixed on the shaft, for example, by means of radial pins installed in holes made in the shaft and entering into grooves located in the support ring, which simplifies routine maintenance and makes it possible to disassemble the impeller of the pump without draining the oil from the separation chambers., 3 NC. P.F; 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 manufactured by JSC "Hydrogas" (see the catalog of products of JSC "Hydrogas" 2005, page 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 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 cavity of the shaft line (lower suspension) has a float type leakage sensor mounted 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). In addition, the fixation of the lower seal from axial movement by supporting it on the impeller (the upper part of which is made in the form of a hub) does not allow disassembling the impeller without depressurization of the oil cavity and draining the oil, which makes routine maintenance more expensive, and fixing the seal spring with a split spring the ring installed in the groove made on the shaft leads to the likelihood of a cuff rupture during dismantling (when pulling through

sharp edges of the groove), which also reduces the reliability of work and complicates routine maintenance.

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 proposed that are presented in this utility model as options.

In a first embodiment, 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.

In a second embodiment, 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 detector, according to a utility model, a cavity is made below the level of the bearings (for collecting leaks and condensate) 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).

In a third embodiment, in a centrifugal pump, comprising: an engine; water pipe formed by two pendants; 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 detector, according to a utility model, the axial movement of the lower mechanical seal is limited by means of a support ring fixed on the shaft, for example, by means of radial pins installed in holes made in the shaft and entering into grooves located in the support ring, which simplifies routine maintenance and makes it possible to disassemble the impeller of the pump without draining the oil from the separation chamber.

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, and in Fig.3 is a section along BB, 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. Support ring,

23. The pin,

24. Shafting,

25. The hole in the shaft,

26. Groove,

27. Challenge

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 (24), formed by suspensions (4, 5) and the seal housing (6), is 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 (24), a hole with a plug (21) is made in its lower part. The mechanical seal (10) is locked against axial movement by means of a support ring (22) fixed by a pin (23) installed in the hole (25) made in the shaft (12) and entering the groove (26) made in the support ring (22).

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 starting the engine (1), 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 (27) to the outlet pipe.

In the event of moisture formation (ingress through seals and / or condensate) in the shaft cavity cavities (24), it will collect in the leakage collection cavity (14), and since this cavity (14) is made below the level of the bearings, the presence in it

moisture will not affect the condition of the bearings, which increases the reliability of their work. 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.

With more complex routine maintenance related to the dismantling of the impeller (9), there is no need to drain the oil from the separation cavity (16), because the lower mechanical seal does not rest on the impeller hub, but on the support ring (22), fixed with the help of a radial pin (23) installed in the hole (25) of the shaft (12), and the support ring (22) entering the groove (26), which also simplifies their implementation.

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

Claims (3)

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 seal assembly formed by two mechanical seals and a separation chamber filled with a cooling lubricant, a flowing part formed by an impeller located in the pump casing and tap, leakage sensor, characterized in that the leakage sensor is located below the level of the bearings in the inner cavity of the shaft shaft. 2. 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 seal assembly formed by two mechanical seals and a separation chamber filled with a cooling-lubricating fluid, a flowing part formed by an impeller located in the pump casing and a tap, a leakage sensor, characterized in that a cavity for collecting leaks with an opening closed by a plug is arranged below the level of the bearings. 3. 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 seal assembly formed by two mechanical seals and a separation chamber filled with a cooling lubricant, a flowing part formed by an impeller located in the pump casing and tap, leakage sensor, characterized in that the axial movement of the lower mechanical seal is limited by means of a support ring fixed on For example, using one or more pins installed in holes made in the shaft and extending into grooves made in the support ring.