JP5806533B2 - Liquid pumping device monitoring system - Google Patents

Description

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

A conventional monitoring system for a liquid pumping device is disclosed in Patent Document 1, for example. This is because an air supply port and an exhaust port for working gas and an inflow port and a pumping port for pressurized liquid are provided in the sealed container, and a float is arranged in the sealed container, and the air supply port is opened when the float reaches a predetermined high level. In addition, the exhaust port is closed and the working gas is supplied from the air supply port into the sealed container, whereby the liquid in the sealed container is pumped from the pressure feed port, and the air supply port is closed when the float reaches a predetermined low level. In addition, the operation of the liquid pumping device is performed in the liquid pumping device in which the working gas in the sealed container is exhausted from the exhaust port and the liquid flows into the sealed container from the inlet until the float reaches a predetermined high level. In order to detect this, the temperature, pressure or liquid level of the liquid pumping device is detected.

JP2002-181287

In the above conventional liquid pumping device monitoring system, the device that detects the temperature of the liquid pumping device cannot detect the operation accurately when the temperature difference between the liquid and the working gas is small. When the pressure is low, the operation cannot be accurately detected, and those that detect the liquid level of the liquid feeding device have a problem that the operation cannot be accurately detected when the liquid level and the float position do not match.

Therefore, the problem to be solved by the present invention is to provide a monitoring system for a liquid pumping device that can accurately detect the operation of the liquid pumping device.

In order to solve the above problems, a monitoring system for a liquid pressure feeding device according to the present invention is provided with a working gas supply port and an exhaust port and a pressure liquid feeding port and a pressure feeding port provided in a sealed container, and a float is formed in the sealed container. When the float reaches a predetermined high level, the air supply port is opened and the exhaust port is closed, and the working gas is supplied from the air supply port into the sealed container, so that the liquid in the sealed container is discharged from the pressure feed port. When the float reaches the predetermined low level, the air supply port is closed and the exhaust port is opened, and the working gas in the sealed container is exhausted from the exhaust port and the liquid is discharged from the inflow port until the float reaches the predetermined high level. In the liquid pumping device that flows into the sealed container, a float position detection switch that detects the position of the float is attached to the sealed container in order to detect the operation of the liquid pumping device. A case in which the switch is fixed to the airtight container, a rotating plate that is rotatably mounted around the central axis of the case, one end fixed to the rotating plate, and the other end extending above the float and rotating due to the floating rise and fall of the float A coil coil that rotates the rotating plate, a movable shaft that is connected to the rotating plate and is displaced in the axial direction along with the rotation of the rotating plate, a permanent magnet built in the movable shaft, and a magnet that operates by the magnetic field of the permanent magnet The magnetic switch is turned on when the float floats to a second predetermined high level slightly lower than the predetermined high level, and the magnetic switch is turned off when the float falls below the second predetermined high level. To do.

According to the present invention, a float position detection switch for detecting the position of the float for detecting the operation of the liquid pumping device is attached to the sealed container, the case where the float position detection switch is fixed to the sealed container, and the central axis of the case A rotating plate that is rotatably attached to the rotating plate, a close-contact coil spring that is fixed to the rotating plate, has one end fixed to the rotating plate and extends above the float, and rotates by the floating and descending of the float to rotate the rotating plate. It consists of a movable shaft that is displaced in the axial direction as the rotating plate rotates, a permanent magnet built in the movable shaft, and a magnetic switch that operates by the magnetic field of the permanent magnet, and the float is slightly lower than the predetermined high level. The magnetic switch is turned on when ascending to the second predetermined high level, and the magnetic switch is turned off when the float is lowered below the second predetermined high level. An effect that the operation of the device can be accurately detected.

It is a block diagram of the monitoring system of the liquid pumping apparatus concerning embodiment of this invention. It is sectional drawing of the liquid pumping apparatus of FIG. It is an expanded sectional view of the float position detection switch of the liquid pumping apparatus of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. The liquid pumping device 24 forms a sealed container with the main body 1 and the lid 2, and the float 3, the float valve 4, and the snap mechanism portion 5 are arranged in the sealed container, and the working gas supply port 6 is provided in the lid 2. An exhaust port 7, a pumping liquid inlet 8 and a pumping port 9 are provided. The inflow port 8 is connected to an inflow pipe 21 communicating with a heat exchanger 25 as a steam using device via an inflow side check valve 20 that allows only a liquid flow to the sealed container, and the pressure port 9 is a liquid pressure destination. Is connected to a pressure-feed pipe 30 communicating with a boiler 29 as a liquid pressure-feed destination via a pressure-feed-side check valve 22 that allows only the flow of liquid to the heat supply port 25. The exhaust pipe 7 is connected to an exhaust pipe 23 communicating with a steam circulation side (not shown).

The float 3 floats up and down around the fulcrum 10 as the center of rotation, moves the float valve 4 of the double valve mechanism up and down to cut off the communication of the pressure feed port 9, and moves the first lever 11 up and down around the fulcrum 12. Displace. Similarly, a second lever 13 is disposed so as to be rotatable about the fulcrum 12, and a compressed coil spring 14 is attached between the end of the second lever 13 and the end of the first lever 11. The operation rod 15 is connected to the upper part of the second lever 13. A spherical exhaust valve body 16 that opens and closes the exhaust port 7 is attached to the upper portion of the operation rod 15, and an operation lever 17 is fixed to the middle portion of the operation rod 15. An air supply rod 18 is arranged above the operation lever 17 so as to be movable up and down, and a spherical air supply valve body 19 that opens and closes the air supply port 6 is further arranged above the air supply rod 18 in a free state.

The liquid pumping device 24 and the float position detection switch 33 constitute a liquid pumping device monitoring system. As shown in FIG. 3, the float position detection switch 33 includes a case 36 fixed to the main body 1 by screw coupling, and a rotating plate 38 rotatably attached to an inner end bifurcated portion 36 a of the case 36 by a central shaft 37. The rotating plate 38 has one end fixed by press-fitting and the other end extending above the float 3 and rotating by the float 3 descending to rotate the rotating plate 38, and one end bifurcated portion 40a is a connecting shaft 41. The movable shaft 40 connected to the rotary plate 38 and displaced in the axial direction as the rotary plate 38 rotates, the permanent magnet 42 built in the other end of the movable shaft 40, and the partition 35 b of the case 35, the permanent magnet 42. And a magnetic switch 43 that is operated by the magnetic field of the permanent magnet 42.

FIG. 2 shows a state where the liquid level in the sealed container is low and the float 3 is located at the bottom. The float valve 4 is closed to shut off the inside of the sealed container and the pressure feed port 9, the air supply valve body 19 closes the air supply port 6, and the exhaust valve body 16 opens the exhaust port 7. The working steam in the sealed container is exhausted from the exhaust port 7 to the steam circulation side through the exhaust pipe 23, and the liquid generated in the heat exchanger 25 is sealed from the inlet 8 through the inlet pipe 21 through the inlet check valve 20. It flows into the container. As the liquid level in the sealed container rises, the float 3 rises and the float valve 4 opens. After the float 3 floats and comes into contact with the contact coil spring 39, the rotating plate 38 rotates counterclockwise around the central axis 37 via the contact coil spring 39, and the movable shaft 40 moves to the left along with the rotation of the rotating plate 38. The permanent magnet 42 approaches the magnetic switch 43 and the magnetic switch 43 is turned on at the second predetermined high position. When the float 3 reaches a predetermined high position, the snap mechanism portion 5 snaps and the air supply valve body 19 opens the air supply port 6 and the exhaust valve body 16 closes the exhaust port 7 and is sealed from the air supply port 6. The liquid in the sealed container is pumped from the pumping port 9 to the boiler 29 via the pumping side check valve 22 by the working steam supplied into the container. When the float 3 descends as the liquid level in the sealed container is lowered by the liquid pumping, the contact coil spring 39 and the rotating plate 38 rotate clockwise around the central axis 37, and the movable shaft moves along with the rotation of the rotating plate 38. When 40 is displaced to the right and the permanent magnet 42 is moved away from the magnetic switch 43 and the float 3 is lowered below the second predetermined high level, the magnetic switch 43 is turned OFF. Thereafter, when the float 3 reaches a predetermined low level, the float valve 4 is closed, the snap mechanism portion 5 snaps to the opposite side, the air supply valve body 19 closes the air supply port 6 and the exhaust valve body 16 The exhaust port 7 is opened. Such an operation cycle is repeated. The operation of the liquid pumping device 24 is detected by counting ON / OFF of the float position detection switch 33.

  INDUSTRIAL APPLICATION This invention can be utilized for the monitoring system of the liquid pumping apparatus which pumps the liquid which generate | occur | produced with various vapor | steam using apparatuses to a liquid pumping destination by working gas.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 6 Air supply port 7 Exhaust port 8 Inflow port 9 Pumping port 24 Liquid pumping device 33 Float position detection switch

Claims (1)

The closed container is provided with an inlet and outlet for working gas and an inlet and outlet for pressurized liquid. A float is placed in the sealed container. When the float reaches a predetermined level, the inlet is opened and exhausted. When the opening is closed and the working gas is supplied into the sealed container from the air supply port, the liquid in the sealed container is pumped from the pressure feed port, and when the float reaches a predetermined low level, the air supply port is closed and the exhaust port is closed. The operation of the liquid pumping device is detected in the liquid pumping device in which the working gas in the sealed container is exhausted from the exhaust port and the liquid flows into the sealed container from the inflow port until the float reaches a predetermined high level. For this purpose, a float position detection switch for detecting the position of the float is attached to the sealed container, and the float position detection switch is fixed to the sealed container, and can be rotated around the center axis of the case. A rotating plate that is connected to the rotating plate and connected to the rotating plate to rotate the rotating plate. Accordingly, it is composed of a movable shaft that is displaced in the axial direction, a permanent magnet built in the movable shaft, and a magnetic switch that operates by the magnetic field of the permanent magnet, and the float floats to a second predetermined high level lower than the predetermined high level. A monitoring system for a liquid pressure feeding device, wherein the magnetic switch is turned on and the magnetic switch is turned off when the float falls below a second predetermined high level.

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