JP4326865B2 - Liquid pumping device - Google Patents

Description

  The present invention relates to a liquid pumping device that pumps liquid such as hot water or fuel with high-pressure working steam. The liquid pressure feeding device of the present invention is particularly suitable as a device for sending condensate generated in various steam using devices to a boiler or a waste heat utilization site.

  In the conventional liquid pumping device, the air supply port and the exhaust port of the working fluid and the inlet and the pumping port of the pumping liquid are provided in the sealed container, and only the liquid flow to the sealed container is allowed inside the sealed container of the inlet. An inflow check valve is provided, the inlet is connected to the pumping liquid generation source, the pumping port is connected to the liquid pumping destination, and only the liquid flow to the liquid pumping destination is allowed inside the sealed container of the pumping port. A pressure-feed-side check valve is provided, the air supply port is connected to the high-pressure working fluid source, the exhaust port is connected to the pressure-feeding liquid generation source side through the exhaust pipe, and the liquid level in the sealed container is kept at a predetermined high level. When it reaches, the air supply port is opened and the exhaust port is closed and the working fluid is supplied into the sealed container, so that the liquid in the sealed container is pumped from the pumping port to the liquid pumping destination, and the liquid in the sealed container is When the position reaches a predetermined low level, the air supply port is closed and the exhaust port is opened. Until the liquid level in the closed container reaches a predetermined high level, the working fluid in the sealed container is exhausted from the exhaust port to the pressurized liquid generation source side, and the liquid on the pressurized liquid generation source side flows into the sealed container from the inlet. Is.

In the conventional liquid pumping device, when steam is used as the working fluid, the water is discharged due to a rapid flow rate fluctuation or density change when the working steam exhausted from the exhaust port is mixed with the pumping liquid on the pumping liquid generation source side. There was a danger of causing a hammer, and there was a problem of generating noise and vibration.
Japanese Patent Publication No. 48-27648

  The problem to be solved is to prevent a water hammer from occurring when the working vapor exhausted from the exhaust port is mixed with the pumped liquid on the pumped liquid generation source side.

The present invention provides an air inlet side and an exhaust port for working steam and an inlet and a pumping port for pumping liquid provided in the sealed container, and allows only a liquid flow to the sealed container inside the sealed container at the inlet. A check valve is provided, the inlet is connected to the pumping liquid generation source, the pumping port is connected to the liquid pumping destination, and only the liquid flows to the liquid pumping destination inside the sealed container or the liquid pumping destination side of the pumping port. Is provided with a pressure-feed-side check valve, the air supply port is connected to a high-pressure working steam source, the exhaust port is connected to the pressure-feeding liquid generation source side through an exhaust pipe, and the liquid level in the sealed container is predetermined. When the air pressure reaches a high level, the air supply port is opened and the exhaust port is closed and the working vapor is supplied into the sealed container, so that the liquid in the sealed container is pumped from the pumping port to the liquid pumping destination, and the inside of the sealed container is When the liquid level reaches a predetermined low level, the air supply port is closed and the exhaust port is opened. Until the liquid level in the sealed container reaches a predetermined high level, the working vapor in the sealed container is exhausted from the exhaust port to the pressurized liquid generating source side, and the liquid on the pressurized liquid generating source side flows into the sealed container from the inlet. In the liquid pressure feeding apparatus, a mixing container loaded with a buffer member is provided inside the inlet and the inlet check valve between the inlet and the inlet check valve, and the exhaust pipe is pumped. The liquid generation source side is inserted into the mixing container from the upper part of the mixing container and opened to the lower part of the mixing container .

  In the present invention, the flow velocity of the working steam exhausted from the exhaust port is reduced by the buffer member loaded in the mixing container, so that the water hammer does not occur when the working steam and the pumped liquid are mixed in the mixing container. This produces an excellent effect that noise and vibration are not generated.

  The present invention provides a mixing container loaded with a buffer member made of a woven or knitted fiber metal fine wire such as stainless steel between an inlet and an inflow check valve, and the pumping liquid generation source side of the exhaust pipe is disposed on the mixing container Is opened. Therefore, the working steam exhausted from the exhaust port is reduced in flow rate by the buffer member loaded in the mixing container. Therefore, a water hammer does not occur when the working vapor is mixed with the pumped liquid in the mixing container.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The liquid pumping device 24 of the present invention forms a sealed container with a main body 1 and a lid 2, and an operating steam supply port 6, an exhaust port 7, and a pumping liquid inlet 8 are provided on the lid 2. The pressure feed port 9 is provided.

  An inflow check valve that allows only the flow of liquid to the sealed container is provided on the inner side of the sealed container of the inlet 8, and the inlet 8 is connected to the inlet pipe 21 that communicates with the heat exchanger 25 serving as a pressure-feeding liquid generation source. Connecting. Between the inflow port 8 and the inflow side check valve, there is provided a mixing container 26 loaded with a buffer member 27 made of a woven or knitted stainless steel fibrous metal thin wire. The exhaust port 7 is connected to the mixing container 26 via the exhaust pipe 23. The pumping liquid generation source side of the exhaust pipe 23 is inserted into the mixing container 26 and opened. A pressure-feed-side check valve that allows only the flow of liquid to the liquid pressure-feed destination is provided on the inside of the sealed container of the pressure-feed port 9, and the pressure-feed port 9 is connected to a pressure-feed pipe 30 that communicates with the boiler 29 as the liquid pressure-feed destination. . The air supply port 6 is connected to an air supply pipe 32 communicating with a steam pipe 31 as a high-pressure working steam source.

  In a state where the liquid level in the sealed container is low, the sealed container and the pressure feeding port 9 are shut off, the air supply port 6 is closed, and the exhaust port 7 is opened. The working steam in the sealed container is exhausted from the exhaust port 7 to the mixing container 26 through the exhaust pipe 23, and the condensate generated in the heat exchanger 25 flows into the inlet 8 from the inflow pipe 21 and flows into the inflow side from the mixing container 26. It flows into the sealed container through a check valve. The working steam exhausted from the exhaust port 7 is reduced in flow rate by the buffer member 27 loaded in the mixing container 26, so that no water hammer occurs when mixing with the condensate in the mixing container 26.

  As the liquid level in the sealed container rises, the inside of the sealed container and the pressure feed port 9 are communicated. When the liquid level in the sealed container reaches a predetermined high level, the air supply port 6 is opened and the exhaust port 7 is closed, The condensate in the sealed container is pumped from the pumping side check valve to the boiler 29 through the pumping port 9 to the boiler 29 by the working steam supplied from the air supply port 6 into the sealed container. When the liquid level in the sealed container decreases and reaches a predetermined low level as the liquid is pumped, the inside of the sealed container and the pumping port 9 are shut off, the air supply port 6 is closed, and the exhaust port 7 is opened.

The block diagram of the liquid pumping apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 6 Air supply port 7 Exhaust port 8 Inflow port 9 Pressure feed port 21 Inflow pipe 23 Exhaust pipe 24 Liquid pumping device 25 Heat exchanger 26 Mixing container 27 Buffer member 29 Boiler 30 Pressure feed pipe 31 Steam pipe 32 Supply pipe

Claims (1)

The closed vessel is provided with a supply and exhaust port for working steam, and an inlet and a pressure inlet for pumping liquid, and an inflow check valve that allows only the flow of liquid to the sealed container is provided inside the sealed container at the inlet. A pumping unit is provided, the inlet is connected to the pumping liquid generation source, the pumping port is connected to the liquid pumping destination, and only the liquid flow to the liquid pumping destination is allowed inside the sealed container inside the pumping port or the liquid pumping destination side. When the side check valve is provided, the air supply port is connected to the high-pressure working steam source, the exhaust port is connected to the pumping liquid generation source side through the exhaust pipe, and the liquid level in the sealed container reaches a predetermined high level When the supply port is opened and the exhaust port is closed and the working vapor is supplied into the sealed container, the liquid in the sealed container is pumped from the pumping port to the liquid pumping destination, and the liquid level in the sealed container is reduced. When it reaches a predetermined low level, the air supply port is closed and the exhaust port is opened to close the air supply port. The working vapor in the sealed container is exhausted from the exhaust port to the pressurized liquid generating source side until the liquid level in the container reaches a predetermined high level, and the liquid on the pressurized liquid generating source side flows into the sealed container from the inlet In the pressure feeding device, a mixing container loaded with a buffer member is provided in the upper portion between the inlet and the inflow side check valve and a connection port to the inflow port and the inflow side check valve is provided therein, and a pressure liquid generation source for the exhaust pipe A liquid pressure feeding device characterized in that the side is inserted into the mixing container from the upper part of the mixing container and opened to the lower part of the mixing container .

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