RU83301U1 - PUMP UNIT FOR PUMPING HOT NON EXPLOSIVE HAZARDOUS LIQUIDS - Google Patents

Abstract

1. A pumping unit for pumping hot non-explosive fluids, consisting of a pump with stuffing box, suction and discharge pipes and pipelines, an external heat exchanger, a mechanical seal and a network of auxiliary pipelines, characterized in that, for the safe operation of the unit by preventing the release of hot liquid and its vapor into the environment, the mechanical seal is made in tandem type, the network of auxiliary pipelines is made of three sections, a common one including a heat exchanger made with an inlet for the selection of the pumped liquid in the high-pressure area of the unit, and two subsequent sections, one made with an outlet to the stuffing box, and the other including a mechanical seal made with a non-return valve and with an outlet to the low-pressure region unit. ! 2. The pump unit according to claim 1, characterized in that throttling devices for controlling fluid flows, pressure and temperature sensors are installed on auxiliary pipelines.

Description

The utility model relates to the field of pumping equipment.

Known pump unit SE500-70, pumping hot water and consisting of a pump with stuffing box, suction and discharge pipes, a remote heat exchanger and a single mechanical seal / 1 /. Using the impeller integrated in the seal, part of the hot water being pumped is sent through auxiliary pipes through the refrigerator and returned to the seal, forming a chilled water zone before the seal and in the seal. The pressure in the stuffing box and in the seal depends on the temperature of the water, is equal to the saturation pressure and can significantly exceed atmospheric pressure.

The disadvantage of this unit is the failure to meet the requirements for safe operation in case of failure of the mechanical seal, leading to the release of hot water and its steam into the environment.

The purpose of the proposed utility model of the pumping unit is the safety of operation when pumping hot non-explosive liquid by preventing the release of it and steam into the environment.

This goal is achieved by the fact that in a pumping unit consisting of a pump with a stuffing box, suction and discharge pipes and pipelines, a remote heat exchanger, a mechanical seal and a network of auxiliary pipelines, the mechanical seal is made in tandem type, the network of auxiliary pipelines is made of three sections, a common including a heat exchanger made with an inlet for the selection of the pumped liquid in the high pressure area of the unit, and two subsequent sections, one of which Nogo yield the packing box, and the other including a mechanical seal made with the check valve and exit into the low pressure region of the unit.

To control fluid flows and control the operation of the seal, throttling devices, pressure and temperature sensors can be installed in the pipeline network.

Figure 1 shows the pumping unit pumping hot non-explosive fire liquids. The unit has: a pump 1 with a stuffing box 2, a suction 3 and a discharge 4 nozzles and pipelines, an external heat exchanger 5, a mechanical tandem type seal 6, a network of auxiliary pipelines with a common section 7, including a heat exchanger 5, and subsequent sections 8 and 9 with a non-return valve 10 and including a seal 6. Throttle devices 11, pressure sensors 12, and a temperature sensor 13 are installed on auxiliary pipelines.

When the unit is operating, the pumped liquid comes from the high pressure area of the unit (for example, from the discharge pipe 4 of the pump 1) through the throttle device 11 at a pressure higher than the suction pressure to the heat exchanger 5, where it is cooled to the required safe temperature controlled by the temperature sensor 13. After the heat exchanger, the first flow fluid in section 8 of the auxiliary pipelines enters the stuffing box 2. Before entering the chamber, pressure is monitored by the sensor 12, the second fluid flow in section 9 with d the spacer device 11 enters through the mechanical seal 6 and through the check valve 10 to the low pressure region (for example, to the suction pipe 3 of the unit). Before entering the seal 6, the pressure is monitored by the sensor 12.

During normal operation of the pump unit, the pressure in section 8 is set more than the pressure in section 9 of the auxiliary pipelines.

In case of failure of the internal sealing pair of the mechanical seal, the pumped product from the stuffing box 2 will go to the mechanical seal 6 and through section 9 through the check valve 10 to the suction pipe 3 of the pump unit and there will be no release of hot water and steam into the environment.

The change in pressure in section 8 relative to the nominal indicates a breakdown of the inner pair of the seal.

If the external sealing pair of the mechanical seal breaks down, the product entering the pipeline section 9 cooled to a safe temperature will flow into the environment without steam formation. If the pressure in the mechanical seal drops below the pressure in the suction pipe of the pump unit, the check valve closes and there is no release of hot water and steam into the environment.

The pressure drop in section 9 relative to the nominal indicates a breakdown of the outer pair of seals

Claims (2)

1. A pumping unit for pumping hot non-explosive fluids, consisting of a pump with stuffing box, suction and discharge pipes and pipelines, an external heat exchanger, a mechanical seal and a network of auxiliary pipelines, characterized in that, for the safe operation of the unit by preventing the release of hot liquid and its vapor into the environment, the mechanical seal is made in tandem type, the network of auxiliary pipelines is made of three sections, a common one including a heat exchanger made with an inlet for the selection of the pumped liquid in the high-pressure area of the unit, and two subsequent sections, one made with an outlet to the stuffing box, and the other including a mechanical seal made with a non-return valve and with an outlet to the low-pressure region unit. 2. The pump unit according to claim 1, characterized in that throttling devices for controlling fluid flows, pressure and temperature sensors are installed on auxiliary pipelines.